tms manual e

Transformer measurement system TMS 580

Instruction manual

HAEFELY Test AG

Version 2.3

General operation 1

Contents General operation 3

Standard elements, terminology ..........................................................................................3 Test........................................................................................................................3 Measurement type .................................................................................................3

Operation from the keyboard...............................................................................................4 Important key functions ........................................................................................4

Operation with the mouse....................................................................................................4 Measurement .........................................................................................................6 Report....................................................................................................................6

Calculation under various standards 7 No-load measurement..........................................................................................................7

ANSI/IEEE C57.12.90 ..........................................................................................7 DIN/VDE 0512 .....................................................................................................7 Calculation of no-load current in percentage ........................................................8 IEC 76-1/1993.......................................................................................................8 Optional temperature correction............................................................................8

Load loss measurement .......................................................................................................9 ANSI / IEEE, DIN / VDE, IEC.............................................................................9

Material definitions ...........................................................................................................12 Conductor material file: TMS.MAT ...................................................................12 Core material file: TMS.COR .............................................................................13

Getting started 15 System Configuration........................................................................................................15

Hardware .............................................................................................................15 Voltage Channel..................................................................................................16 Current Channel ..................................................................................................16 Ranging ...............................................................................................................16

Measurement (OUT-related) 17 OUT-related means: ..........................................................................................................17 Welcome screen.................................................................................................................18 Test ....................................................................................................................................19

Setting up a new test............................................................................................19 Loading an existing test.......................................................................................21 Inputting order data .............................................................................................21 Inputting transformer data ...................................................................................23 Inputting tap data.................................................................................................26 Inputting global documentation...........................................................................32 History (viewing database)..................................................................................33

Measurement types ............................................................................................................34 Selfcheck.............................................................................................................34 Wattmeter............................................................................................................36 Induced voltage test.............................................................................................39 No-load measurement .........................................................................................43 Load loss measurement .......................................................................................47

2 General operation

Zero-sequence measurement ...............................................................................52 Heat run...............................................................................................................56

Measurement (measurement related) 61 measurement related means : ...................................................................................61 Test ....................................................................................................................................61

Inputting transformer data ...............................................................................61 Induced voltage test .........................................................................................64 No-load measurement .....................................................................................68 Load loss measurement ..................................................................................75 Zero-sequence measurement.........................................................................82 Heat run...............................................................................................................88

Test report 93 Display test report ...........................................................................................................93 Modify test report template ............................................................................................93

CSV Data 95 Export to CSV..................................................................................................................95 Import from CSV .............................................................................................................95

Help 96 General ..............................................................................................................................96 Starting the help function ...............................................................................................96

Dangers and Safety Notes (English) 97 General Notes ....................................................................................................................97 Dangers when Working on the Control Desk....................................................................97 Safety Precautions when Working with High Voltage ......................................................98 Dangers of the High Voltage System ................................................................................98

Gefahren- und Sicherheitshinweise (German) 99 Allgemeine Hinweise ........................................................................................................99 Gefahren beim Arbeiten am Steuerpult .............................................................................99 Sicherheitsvorkehrungen beim Arbeiten mit Hochspannung ..........................................100 Gefahren der Hochspannungsanlage ...............................................................................100

Dangers et indications de scurit (French) 102 Indications gnrales .......................................................................................................102 Dangers lors de travaux au niveau du pupitre de commande ..........................................102 Prcautions de scurit lors de travaux sous haute tension..............................................103 Dangers de linstallation haute tension .........................................................................104

Index 105

General operation 3

General operation

Standard elements, terminology

Test The word test denotes the complete testing of a transformer. The test consists of data from all measurement types (measurements, documentation), the transformer definitions, and the global documentation data. All data are stored in XML format and can be printed out as a final test report after the test is completed. A test can be performed in either of two modes:

Object under test variant Here the first step is to input all data on the object under test (OUT), that is, describe the transformer in full. When performing a measurement, only the current transformer configuration need be specified; the system accesses the predefined data. These data, however, cannot be modified during the measurement application. This mode is suitable for ordinary single-phase and three-phase OUTs having up to six independent windings with arbitrarily many taps. This is accordingly the test type for fully normal transformers.

Measurement variant This second mode is left as open as possible. Instead of defining the transformer, individual measurement configurations are predefined and measurements are then performed on the basis of these. Information about winding nomenclature, tap selection and ratings must be input as running text here, since the system does not recognize the transformer being measured. As a result, the test is quite versatile though somewhat more costly. This mode is particularly suitable for autotransformers, but also for all other applications where the transformer does not fit into the object under test scheme (more than six windings, etc.).

Measurement type Measurement types are the several applications supported by the TMS 580 system:

Induced voltage test No-load measurement Load loss measurement Zero-sequence measurement

4 General operation

Heat run And in addition:

Selfcheck Wattmeter (visualization of wattmeter measurements for quick inspection)

Operation from the keyboard

Important key functions

F1 (function key) Pressing opens the help for the currently selected menu item or dialog element.

F10 (function key) Pressing activates the menu. A menu item can be selected with the arrow and keys.

Other key assignments A menu item can also be selected by simultaneously pressing and a letter shown underlined in the menu.

key Pressing the key causes an action to be carried out or confirms an input.

key The key can be pressed to cancel an action or cancel an input.

key In a dialog, causes a jump to the next element. Pressing and selects the preceding element.

Arrow keys Depending on what element is active, these keys may be used to select an item.

Operation with the mouse The entire system can be operated with the mouse. Only the left mouse button is active. To activate the element under the mouse pointer, click the left mouse button once. To mark input text, hold down the left button and move the mouse pointer over the desired text. All text input boxes can also be marked by double clicking.

General operation 5

!

Without fail, read chapter Dangers and Safety Directives before switching on your system.

!

The system must be operated by trained personnel only.

6 General operation

Measurement The measurement is a data record representing an individual measurement of one measurement type. For example, the measurement type no-load measurement involves performing and storing 20 individual measurements with various voltages, taps, etc.

Report The report is a list of all definitions, settings, inputs and measurements. Report creation and printing are done by the report generator, which is based on 'XML converted to HTML'. The form for the test report (layout, title, etc.) is prepared by Haefely Test AG. This form can also be modified or adapted (provided the user is familiar with XML, XSL!).

Calculation under various standards 7

Calculation under various standards

No-load measurement

ANSI/IEEE C57.12.90 The power is corrected with the formula:

2

2

MEAN

RMS1

m

P UU

P

PP

+

=

P 1 P2 1=

P measured no-load power Pm corrected no-load power URMS effective value of measured voltage UMEAN average value of measured voltage

P1 is a value depending on the material, the frequency, and the inductance. It is read in from the file TMS.COR.

DIN/VDE 0512 The power is corrected with the formula:

PP

PU

U P

m

1RMS

MEAN

2

2

=

+

P 1 P2 1=

P corrected no-load power Pm measured no-load power URMS effective value of measured voltage UMEAN average value of measured voltage

P1 is a value depending on the material, the frequency, and the inductance. It is read in from the file TMS.COR.

8 Calculation under various standards

Calculation of no-load current in percentage The no-load current is calculated for the supplying winding in the real application (HV) even if it is measured on XV, YV or TV winding :

I 100%II

SSNLperc

m

Nm

HV=

INLperc no-load current in percentage IN rated current of measured winding Im measured current SHV rated app. power of supplying winding in the real application (HV) Sm rated app. power of measured winding

IEC 76-1/1993 The power is corrected with the formula:

P P (1 d) P 1 U UUm mMEAN RMS

MEAN= + = +

P measured no-load power Pm corrected no-load power URMS effective value of measured voltage UMEAN average value of measured voltage

This formula can be used only if UMEAN and URMS are equal within 3%. If this condition is not satisfied, the TMS issues an appropriate warning message when a measurement is stored.

Optional temperature correction Optionally, the no-load loss power can be corrected to the rated temperature of the transformer:

( )( )( )P P 1 k T T 10C a 4=

Pc no-load power corrected for temperature k temperature coefficient T standard temperature Ta temperature of no-load measurement

Here k is a value that depends on the material, the frequency, and the inductance. It is read in from the file TMS.COR.


Load loss measurement

ANSI / IEEE, DIN / VDE, IEC

Step 1: Relate to rated current

P PIIchgn chgNsp

n

2

=

U UIIccgn ccgNsp

n=

Pchgn load-loss power reduced to rated current Pchg measured load-loss power INsp rated current of the winding being fed In measured short-circuit current Uccgn short-circuit voltage reduced to rated current Uccg measured short-circuit voltage

If there is a Reduced power winding system selected, all rated currents are related to the reduced power of the short-circuited winding(s) : (used in Step1 .. Step3 )

I IS

SN rel NSC

SUP=

INrel related rated current IN rated current Ssc app. power ( short-circuited winding(s) ) Ssup app. power ( supplying winding )

Step 2: Convert short-circuit voltage to percent

eUU 100%rcgn

rcgnNsp

=

eccgn short-circuit voltage as percent of rated voltage Uccgn short-circuit voltage related to rated current UNsp rated voltage of the winding being fed


Step 3: Calculate ohmic losses at TRes

1-Phase transformator: P I RohmTRes N g

n

=

3-Phase transformator: P I RohmTRes act act

n

= 3

Y, Z:

R , I = Iact act N= 16 3

1Rg

Yn, Zn:

R , I = Iact act N= 13 3

1Rg

open:

R , I =I

3act actN

= 13 3

1Rg

closed:

R , I =I

3act actN

= 12 3

1Rg

PohmTRes ohmic losses at TRes TRes temperature of resistance measurement n all current-carrying windings Iact active current in the winding IN rated current of the winding Ract resistance in the winding Rg measured resistance at TRes

Step 4: Correct ohmic losses to Tg

P P T.C.R. T

T.C.R. TohmTg ohmTResg

Res=

+

+

PohmTg ohmic losses at Tg Tg temperature of short-circuit measurement TRes temperature of resistance measurement T.C.R. temperature coefficient of resistance

The temperature coefficient of resistance depends on the conductor material chosen and is read from the file TMS.MAT.

Step 5: Subtract losses at Tg

P P PaddTg chg ohmTg=

PaddTg additional losses at Tg


Step 6: Correct to standard temperature Tst (according to IEC, Tst = 75 C)

gc

stc

TTTT

+

+=

TstTststT ohmchaddPPP =

TstTstTst addohmch PPP +=

)1()(

+=TgTst addohm PP

PohmTst ohmic losses at Tst

PaddTst additional losses at Tst

Tst standard temperature

PChTst calculated load losses at Tst Tc Temperature coeffitient 235 IEC Copper 234.5 Ansi Copper 225 Aluminium

Step 7: Calculation of Rk, -Zk and -Xk

1-Phase transformator:

Nccgn

Nccgn

IIUU

*

*Zk =

N

chgn

PP

=kR

22kX kk RZ =

At standard temperature:

N

chTst

PP

=kTstR

kkTst XX =

22kTstZ kTstkTst XR +=

Pchgn load-loss power reduced to rated current

PChTst calculated load losses at Tst

PN rated power of the winding

UN rated voltage of the winding

IN rated current of the winding

Uccgn short-circuit voltage related to rated current

Iccgn short-circuit Current related to rated current

Zk short-circuit impedance

Xk short-circuit reactance

Rk short-circuit resistance

ZkTst short-circuit impedance at Tst

XkTst short-circuit reactance at Tst

RkTst short-circuit resistance at Tst


Material definitions The various material constants are stored in two files.

Conductor material file: TMS.MAT This file contains the temperature coefficients of resistance for various conductor materials. If necessary, this file can be worked on in any editor. The first line (title line) must not be changed. It contains the field names that the TMS program uses. Starting with the second line, conductor materials and their resistance values can be input. One line must always be input for each material. The first value in the line contains the text that is to appear in the programs menu. The second value is the temperature coefficient of resistance. It must be input in a numerical format. A point . must be used as the decimal point. Each item must be followed by a semicolon ;. There must be no spaces between items. The temperature coefficient is always stated in terms of degrees Celsius! If other temperature units (F or K) are used in the program, the T.C.R. values are internally converted to C by the software.

Example of a file:

Material;ResistanceValue; default;235; Copper;235; Aluminum;225;


Core material file: TMS.COR This file contains two values for use in no-load loss measurements: P1 form factor correction k optional temperature correction These two quantities depend on the core material, frequency, and inductance. The values used by the program are calculated from a plotted curve for the material. This file contains sampled points from this curve in tabular form. Each line defines one point on the curve. Values between these points are linearly interpolated by the TMS. Values beyond the curve are automatically taken as P1 = 0.5 k = 1 If necessary, this file can be worked on in any editor. The first line (title line) must not be changed. It contains the field names that the TMS program uses. Starting with the second line, core materials, rated frequencies, inductances, P1 and k can be input. The first value in the line contains the text that is to appear in the programs menu. The second value contains the rated frequency; the third, the rated inductance; the fourth, the value for P1; and the fifth, the value for k. Numbers must be input in a numerical format with a point . for the decimal delimiter. Every item must be followed by a semicolon ;.

Example of a file:

CoreType;Frequency;Inductance;P1;k; First line default;50;1.0000;0.500;1.00; default;50;2.0000;0.500;1.00;

Values for standard material at 50 Hz

default;60;1.0000;0.500;1.00; default;60;2.0000;0.500;1.00;

Values for standard material at 60 Hz

default;16.67;1.0000;0.500;1.00; default;16.67;2.0000;0.500;1.00;

Values for standard material at 16-2/3 Hz

BlechXY;50;1.0000;0.41;6.2; BlechXY;50;1.2000;0.45;6.1; BlechXY;50;1.4000;0.50;6.0; BlechXY;50;1.6000;0.58;5.8; BlechXY;50;1.8000;0.65;4.9; BlechXY;50;2.0000;0.74;2.1;

Values for XY plate at 50 Hz

Getting started 15

Getting started

System Configuration The software can be started up with several different start options. The option is to be added to the command line of the program start: The options depend on the hardware configuratio of the TMS System and only make sense if the suitable hardware is available.

Hardware Radiobutton Standard: System fully equipped with current and voltage channels. Radiobutton Ilight: Now current channels are available. Just one current overflow channel. Radiobutton Ulight: Now voltage channels are available. Just one voltage overflow channel. Radiobutton Raduced: Now channels at all. Only the Wattmeter is available.

16 Getting started

Voltage Channel 100 V 100 kV: 100 kV version 100 V 200 kV : 200 kV Version

Current Channel 1 A 2000 A : 2 kA Version 2 A 4000 A : 4 kA Version

One Phase only: The system works in single phase mode. Only phase A is active With calibrator: System with built in Calibrator. Zero Resistances Allowed: The Systen accepts 0 values for coil resistances.

Ranging The Ranging of the Norma Wattmeter can be set to automatic ranging or to a fixed range.

Measurement (OUT-related) 17

Measurement (OUT-related)

OUT-related means: Here the first step is to input all data on the object under test (OUT), that is, describe the transformer in full. When performing a measurement, only the current transformer configuration need be specified; the system accesses the predefined data. These data, however, cannot be modified during the measurement application. This mode is suitable for ordinary single-phase and three-phase OUTs having up to six independent windings with arbitrarily many steps. This is accordingly the test type for fully normal transformers.

18 Measurement (OUT-related)

Welcome screen After the computer is turned on, Microsoft Windows and the TMS program are loaded automatically. At the end of the boot procedure, the welcome screen appears. This is closed by the Close button. The main screen comes up next.

This screen is divided into three regions: Test preparation:

All prepared test data for the order and the transformer are input in this area together with global documentation text.

Measurement applications: All tests (measurement applications) are performed in this section.

Reporting: This part of the screen is for creation, viewing and printing of the test report.


Test Before measurements can be performed with the TMS, a test must be initialized. This is done either by setting up a new test or loading an existing test. Only the selfcheck and the wattmeter visualization can be executed without initializing a test.

Setting up a new test

With mouse With keyboard

Select the item New Test in the menu.

The following dialog box appears:

In the directory Listbox the directory to store the Test can be selected and under Test Name: a new test name can be entered. A test is stored in a dedicated directory with the test name.


Pressing the OK Button confirms the selection and closes the Dialog. Then a little Dialog asks whether the data of an existing Test should be used as template or not.

To chose the test from hwere the data shall be taken over a new Dialog will be opened where the test and the sections to take over selected can be selected.


Loading an existing test


Select the item Test, open in the menu.


The desired test can be selected with the mouse or the arrow keys. After confirming with the OK button, all data are loaded and the test can be resumed.

Inputting order data After a test has been initialized, the order data can be input.


Select the item Test, order data in the menu.



There are 18 input boxes and one running-text box available for the order data. The first five boxes have standard names, but all names can be changed by clicking on the field name with the mouse and editing the text. Unused boxes (. . . :) are later suppressed in the test report. In addition to the input box texts, a continuous text can be input in the Note box.


Inputting transformer data Now the transformer data are input.


Select the item Test, transformer data in the menu.


The No radio button must be activated in the field named Measurementbased definition. This means that you are performing a test in the OUT-related mode. If Yes is activated, you are performing a test in the measurement-related mode. See the chapter titled Measurement (measurement related). In the second field, all transformer-specific data are input:

Popup box Frequency The rated frequency applicable to the transformer is selected in this box. Frequency-dependent constants

are stored in the file TMS.COR and can be supplemented or modified if necessary.


Popup box Standard The standard applicable to the transformer is selected in this box. The calculation method used depends

on this setting, for example conversion of no-load losses.

See also No-load measurement Load loss measurement

Radio buttons Phases These buttons are used to define whether the OUT (object under test) is a single-phase or three-phase

transformer. The measurement system is reconfigured appropriately for the measurements. If a single-phase transformer is selected, new radio buttons appear from which the active phase must be selected.

Popup box Standard temperature The information in this box defines at what temperature the load losses and no load losses are to be

calculated.

See also Optional temperature correction

Popup box Temperature units The temperature units are defined in this box. The information applies to all subsequent dialog windows

and displays. If the units are changed, the numerical value of the standard temperature in the preceding box is converted.

Input box Induction The rated inductance is defined in this box. Depending on the standard, this information refers only to an

item in the report or to the calculation of output data. The values for P1, P2 and k are retrieved from the core code table once this value and the rated frequency and core code are given.

The inductance-dependent constants are stored in the file TMS.COR and can be supplemented or modified if necessary.

Popup box Core code The core material is defined in this box. Depending on the standard, this information refers only to an item

in the report or to the calculation of output data. The info box displays the P1, P2 and k values for this core code; these are used in calculating the no-load losses according to ANSI or VDE.

See also Material definitions

The material-dependent constants are stored in the file TMS.COR and can be supplemented or modified if necessary.


The winding data are input in the middle box of the dialog window. In all, up to six windings can be defined. Every winding present must be marked with the corresponding check box. For every winding so marked, the configuration and the number of taps can now be defined.

Data on the rated taps of all marked windings, if defined, are displayed in the lowermost box for information. The dialog window for definition of the winding taps is now brought up with the Configuration button. All taps must be defined in this window.


Inputting tap data

Nominal tap voltage, current and power

By default all Taps are active and included into the measurement. This is indicated by the "X" in the "Active" field of each Tap. By clicking into ths field the status can be toggled between active and inactive. A inactive Tab will not be included into any measurement afterwards. A active Tap must be fully defined for measurement. Otherwhise the Dialog can not be leaved. Clicking into the title field of the "Active" row pops up two Buttons to activate all or deactivate all taps.


If the Tap Voltages are carried out in equal stages the software can calculate this Tap Voltages. Clicking onto the title of the voltage column by the left mouse button pops ut a button to calculate all voltages.

Pressing this button opens the following dialog with tw opossibilities for Tap voltage input:

Min Max (Tap Voltage) In this dialog the Min. Tap Voltage is the Voltage of the Tap with the lowest number and the Max. Tap Voltage is the Voltage of the Tap with the highest numger


With this setting 7 Taps will be calculated with the Voltages 410 V, 440 V, 470 V, 500 V, 530 V, 560 V and 590 V.

U step (per Tap) In this dialog you can set the voltage step from one Tap to the next, the rated voltage of the rated Tap and the number of Taps with higher voltage then the rated Tap voltage.

With this setting 7 Taps will be calculated with the Voltages 410 V, 440 V, 470 V, 500 V, 530 V, 560 V and 590 V and the rated Tap will be the 500 V Tap.

The nominal Tap can be selected by a mouse click into the corresponding field.

Set nominal Tap nb. = 0

Sets the nominal Tab number = 0. The other Taps are numbered symmetrical according to the position o the nominal Tap. (F. I. 2; -1; 0; 1; 2). If nominal Tap Nb = 0 is not selected the Taps are numbered upward (0; 1; 2; 3;..)


The nominal current can be calculated by the software. Clicking into the field of the Nominal current by the lwft mouse button shows a button to calculate the current from nominal power and nominal voltage.

To calculate the current of al taps at once click onto the title field of the current. That pops ut a button to clculate all.

Powerbase For the load loss measurement up to 20 Powerbases can be defined here. The first Powerbase is allwaya predefined as 100 % of the rated power.


Tap winding resistance The winding resistance values are used in the load loss calculation.

The temperature at the time of the resistance measurement must be input in the input box Temperature. The first temperature input can be transferred to all taps automatically by pressing the button while editing the first temperature value. The resistance values can be imported from a measuring data file of a 2288 device. Therefore the configuration of the windings and taps must correspond to the configuration in the 2288 data file.

Popup box Wire material The conductor material with which the transformer is wound appears in this box. The info box

Temperature coefficient of resistance shows the material-dependent value used in calculating the load losses. Items in this popup box and the associated T.C.R. are stored in the file TMS.MAT and can be supplemented or modified if necessary.



Import Data from 2285, 2288 or 229x DataFiles. The TMS Software is able to import data from 2285, 2288 or 229x data files. The measuring data in this files must therefore have a suitable form. In the 2285, 2288 or 229x the windings and Taps must be named correct and according to the followong relation.

Winding identifiers for TMS580 and 2288 or 229x data files

2288 & 229x

Tms Trafo data winding

A-B B-C C-A

HV phase A / A-B HV phase B / B-C HV phase C / C-A

a-b b-c c-a

XV1 phase a / a-b XV1 phase b / b-c XV1 phase c / c-a

3A-3B 3B-3C 3C-3A


Winding identifiers for TMS580 and 2285 data files

2285

Tms Trafo data winding

1U-1V, A-B, H1, 1U,1A 1V-1W, B-C, H2, 1V, 1B 1W-1U, C-B, H3, 1W, 1C

HV phase A / A-B HV phase B / B-C HV phase C / C-A

2U-2V, a-b, X1, 2U, 2A 2V-2W, B-c, X2, 2V, 2B 2W-2U, c-a, X3, 2W, 2C


3U-3V, 3A-3B, Y1, 3U, 3A 3V-3W, 3B-3C, Y2, 3V, 3B 3W-3U, 3C-3A, Y3, 3W, 3C


Data stored under other names or invalid Tap numbers will not be imported by the TMS Software.

To import data from a 2288 data file press the button. In the opened browser dialog select the .RES file containing the resistance data.

To import data from a 229x data file the data must by stored in ASCII form in the 229x measuring unit (Please refer to the manual of the 229x unit). Press the button and select the .Txt file containing the resistance data in the opened browser dialog.

To import data from a 2285 data file the data must by stored in ASCII form in the 2285 measuring unit (Please refer to the manual of the 2285 unit). Press the button and select the .Txt file containing the resistance data in the opened browser dialog.

Please note: To import resistance data. The rated tap data must be entered completely. Otherwise no data can be imported!


Inputting global documentation


Select the item Test, global documentation in the menu.

With this dialog box, global information about the test as a whole can be input. Text that is also to be available in the report is input in the upper field. The text in the lower field, on the other hand, is stored and can be viewed again, but does not appear in the report.


History (viewing database)


Select the item Test, show history in the menu.

With the History command, all stored measurements can be viewed. The following dialog box appears:

All stored measurements are listed in the lower field. If a measurement is selected with the mouse, the measured data are displayed in the upper field. Measurements marked by a * appear in the report. Measurements without a * do not appear in the report. To mark or unmark a measurement for the report double click on the measurement in the listbox.

With mouse Function

Print the current displayed data on the standard printer.

Mark all measurements to be added into the report

Unmark all measurements from being added into the report.

* marks measurement to be entered into the report. Select with double click

Select all (or none) measurements t obe antered into the report


Measurement types Measurement types are started with the appropriate measurement type button or through the Measurement types menu.

Selfcheck


Select Measurement, selfcheck in the menu.

Function: In this test, all ranges of all voltage and current channels are checked for accuracy. Comparison values obtained when the system was placed in service or calibrated are used as the reference; these are stored on the computers hard disk. An error message is output if the departure is too large. Note: The current and voltage channel inputs must be open during calibration and the selfcheck in order to get the most accurate possible verification.

The results can be printed out at the completion or interruption of the selfcheck.


With mouse Function

Start Selfcheck

Stop Selfcheck

Save Selfcheck data into text file


Wattmeter


Select the item Measurement, wattmeter in the menu.

Function: In this measurement type, only the wattmeter readings are visualized. The function aids in quick measurements that do not have to be reported or corrected. The measurements can be printed out but not stored. This measurement type is therefore suitable for checking the transformer configuration and so forth. After this measurement type is started, the measurement screen appears:


Measurements are displayed in the measurement window with the following informational features:

Green The value is correctly measured. Red The corresponding range is not optimally utilized, so the required accuracy is

not guaranteed. Remedy: The appropriate range must be selected. The corresponding range is overloaded. Remedy: Range must be selected.

The status field at left contains status and configuration boxes. As a result, setting and adjustment of the wattmeter can be done quickly.

Measurement: These radio buttons make it possible to select whether phase-to-neutral or phase-to-phase

voltages are measured and displayed. The mode of the wattmeter (active phase) can be selected with the Phase A, Phase B, Phase C, All radio buttons. In the All mode, the wattmeter performs a three-phase measurement. Phase A is taken as reference phase; it must exhibit a signal in the voltage path, since otherwise the wattmeter cannot correctly measure the powers.

Averaging This button makes it possible to input the time over which the displayed average value is formed (1 to 64

sec.). With averaging active (greater than 1 sec.), of course, the repetition rate of measurements drops. Because the measurement system spends practically all its time waiting for new data from the wattmeter when averaging is active, so that operator convenience is greatly impaired (long time required to respond to action), setup should be done with measurement stopped or with averaging = 1 sec.

Display: These two buttons allow a choice whether normal measurement data or harmonics are to be measured

and displayed. Remark: If harmonics are being measured, the voltage and current ranges must be set correctly ahead of time, since the wattmeter cannot properly measure and calculate harmonics if it is underdriven.

Current values: The optimal range for current measurement can be selected in the status box:

0.2 to 0.5 for no-load measurement 0.8 to 1.2 for all other measurements


Description of the toolbar / menu

With mouse With keyboard Function

Menu Measurement, start

The Start command begins the measurement. The repetition rate is about 1.5 second.

Menu Measurement, stop

The measurement is halted with the Stop command. If desired, the measurement can then be printed out.

Menu Measurement, auto range

The Range command sets the ranges of the current and voltage transformers such that they operate in the optimal measuring range. This optimization is based on a snapshot of the state at the moment when the button is pressed; that is, in certain situations (such as overload), this function may have to be repeated several times until the ranges are properly set. In case of an overload, it may be necessary to switch to a higher range manually. Check: All measured voltages and currents must be displayed in green after setting.

Menu ?Help

Opens online help.

Menu File, exit The Exit command exits the wattmeter measurement and returns to the main screen.

Menu Save Wattmeterdata into .CSV file.

Menu Configuration, select voltage range

The command opens a dialog window in which the ranges of the voltage channels for each phase individually or for all phases together can be selected manually. Restriction: In phase-to-phase measurements, the voltage ranges cannot be set individually for each phase.

Menu Configuration, select current range

This command opens a dialog window in which the ranges of the current channels for each phase individually or for all phases together can be selected manually.


Induced voltage test


Select the item Measurement, induced voltage test in the menu.

Function: In this measurement type, the voltage withstand capability between adjacent windings or phases is tested. A test voltage and test duration can be preselected. The timer starts when the measured values rise above the selected voltage, and the measurement in progress is displayed in the status box with the word Wait in red. The status box turns green and displays OK when the test duration has elapsed. The voltage can now be run down again and the measurement can be halted and stored. Note: If the voltage drops below the test voltage during the specified test duration, a message appears in the measurement window. When the induced voltage test is selected, the measurement screen appears:



Green The value is correctly measured.

Red The corresponding range is not optimally utilized, so the required accuracy is not guaranteed. Remedy: The appropriate range must be selected.

******* (red) The corresponding range is overloaded. Remedy: Range must be selected.

The status field at left contains status and configuration boxes. In this way, the most important settings and adjustments for the induced voltage test can be made quickly.

Counter: Every measurement add to the database, for example with the Add command, increments this counter,

which thus shows how many induced voltage tests have already been stored. Act. supply: Input winding or phase to be tested.

Radio button Winding active:The winding now being fed and its present tap are set in these two popup boxes. The rated voltage of the selected tap is displayed below the popup box for information. Radio button Phase active: The phase or phases now being fed can be indicated.Regardless of this setting, all three phases are always measured.

Test: The test duration and test voltage are set in these two popup boxes (confirm with ). The timer is

activated after the measurement is started and as soon as the measured voltage is higher than the input test voltage. This can be noted in the status display Wait The elapsed test time is displayed in the box Time at voltage. The status changes to OK (green) as soon as the measurement time is greater than the input test duration.

Reset: This button resets the timer and the test voltage. Phase-phase Voltages are measured phase-to-phase.

Remark: In this mode, the voltage ranges cannot be set separately for each phase, since otherwise the phase-to-phase measurement cannot be done correctly.

Phase-neutral Voltages are measured phase-to-neutral.


Description of the function bar/menu



The Start command begins the measurement. The repetition rate is about 1.5 second. The timer function will be activated.


The measurement is halted with the Stop command. If desired, the measurement can then be stored.

Menu Data, save The Add command causes the displayed measurement to be stored. It is thus available in the report. The counter in the status box is incremented every time a data record is stored. If the field is deactivated with measurement stopped, either the measurement is already stored or its data are invalid (e.g., in an overload condition).

Menu Data, Memo The Memo command makes it possible to store a note on the stored measurement. This function can be selected with Add when measurement is stopped, before or after the storage operation, and can also be modified.


The Range command sets the ranges of the current and voltage transformers such that they operate in the optimal measuring range. This optimization is based on a snapshot of the state at the moment when the button is pressed; that is, in certain situations (such as overload), this function may have to be repeated several times until the ranges are properly set. In case of an overload, it may be necessary to switch to a higher range manually.

Check: All measured voltages and currents must be displayed in green after setting.

Menu "File, Documentation

With the Docu command, documentation on the induced voltage test can be stored, for example the test time, operator, result, etc.

Menu Measurement, show history

This command displays a list showing all stored measurements. A measurement can be selected in the lower field for viewing in the upper field. History (viewing database)

Menu ?Help Opens online help.

Menu File, exit The Exit command exits the induced voltage test and returns to the main screen.



This command opens a dialog window in which the ranges of the voltage channels for each phase individually or for all phases together can be selected manually. Restriction: In phase-to-phase measurements, the voltage ranges cannot be set individually for each phase.




No-load measurement


Select the item Measurement, no-load measurement in the menu.

Function: The losses of the transformer under no-load conditions are measured. What is more, harmonics up to order 21 can be measured in this measurement type. When no-load measurement is selected, the no-load measurement screen appears:

No-load measurement data (measured data and results calculated according to the selected standard) are displayed in the measurement window with the following informational features:


not guaranteed. Remedy: The appropriate range must be selected. If Corrected watts is red, the conditions of the standard are not satisfied (RMS voltage and mean voltage differ by more than 3%).



The status field at left contains status and configuration boxes. In this way, the most important settings and adjustments for the no-load measurement can be made quickly.

Counter: Every measurement added to the database, for example with the Add command, increments this

counter, which thus shows how many no-load measurements have already been stored. Act. supply: The winding now being fed and its present tap are set in these two popup boxes. The measurement is

configured on the basis of this setting. Test at: Input, through the keyboard or the popup box, showing the test voltage of the selected tap in percent of

rated voltage.

For information, the selected voltage level is displayed below the box. This setting also influences the Auto stop function (see below).

Temperature: The ambient temperature is input in this input box. The input is used for temperature correction (if

selected) and is required for the report. Input value from keyboard, confirm with . Auto stop This function is turned on by selecting the check box. It automatically stops the measurement if the

measured value (RMS total voltage, blue) is within the nominal window (-0%, +0.5%). The nominal value is set in the box Test at. Accordingly, the measurement can be halted and stored at a certain level even in fluctuating networks.

Phase-phase Voltages are measured phase-to-phase.


Phase-neutral Voltages are measured phase-to-neutral. Averaging This button makes it possible to input the time over which the displayed average value is formed (1 to 64


Display: These two buttons allow a choice whether no-load measurement data or harmonics are to be measured

and displayed. Remark: If harmonics are being measured, the voltage and current ranges must be set optimally ahead of time, since the wattmeter cannot properly measure and calculate harmonics if it is underdriven. All these settings as well as the optional temperature correction can also be made through the configuration dialog box.








Menu Data, save The Add command causes the displayed measurement (no-load or harmonic measurement) to be stored. It is thus available in the report. The counter in the status box is incremented every time a no-load measurement record is stored. If the field is deactivated when measurement is stopped, either the measurement is already stored or its data are invalid (e.g., in an overload condition).





Menu Configuration, no-load test

All configuration settings for no-load measurement are accessed with the Config command.

Menu File, Documentation"

With the Docu command, documentation on the no-load measurement can be stored, for example the test time, operator, result, etc.

Menu Data, Save Image

Copy the graphic of the harmonics into the Bitmap files"Harmo_Current.bmp" and "Harmo_Voltage.bmp" in the measurement directory.

Menu Data, show history




Menu File, exit The Exit command exits the no-load measurement and returns to the main screen.


This command opens a dialog window in which the ranges of the voltage channels for each phase individually or for all phases together can be selected manually. Restriction: In phase-to-phase measurements, the voltage ranges cannot be set individually for each phase




Load loss measurement


Select the item Measurement, load loss measurement in the menu.

Function: In load loss measurements, the losses of the short-circuited transformer are determined and calculated. When load loss measurement is selected, the load loss screen appears:

The load loss measurements are displayed in the measurement window with the following informational features:


Black The value is correctly measured. Red The corresponding range is not optimally utilized, so the required accuracy is

not guaranteed. Remedy: The appropriate range must be selected.


The values calculated from the measurements (e.g., corrected load losses) are updated only when the measurement is stored or printed. These values can thus be viewed only in History or by printing. An info window is located below the measurement field. Settings for the measurement in progress can be seen in this window. The corrected load losses are also calculated with these values. Previous load loss measurements are listed in the lowermost field, directly below the information window. It can thus be seen at a glance what measurements have already been performed and which ones are still to be done. The status field at left contains status and configuration boxes. In this way, the most important settings and adjustments for the load loss measurement can be made quickly.


counter, which thus shows how many load loss measurements have already been stored. Act. supply: The winding now being fed and its present tap are set in these two popup boxes. The measurement is

configured on the basis of this setting. For information, the selected rated current of the selected tap is displayed below this box. If there is a Reduced power system selected in the Configuration load loss test- dialog, there will be displayed the reduced current. This setting also influences the Auto stop function (see below).

Act. short-circuit: The shorted winding or windings and the selected tap are set in these popup boxes. Several windings can

also be selected. Nonexistent windings are not displayed. Temperature: The ambient temperature is input in this input box. The input is used for temperature correction (if

selected) and is required for the report. Input value from keyboard, confirm with . Auto stop This function is turned on by selecting the check box. It automatically stops the measurement if the

measured value (RMS total current, blue) is within the nominal window (-0%, +0.5%). The nominal value is determined from the rated current of the winding/tap being fed. This function offers a convenient way to halt and store the measurement at a certain level even in fluctuating networks.







Guaranteed values and Powerbase Guaranteed values for short-circuit voltage and load losses, Powerbase and a Reduced power system can only be input or selected in the configuration dialog window.

The shown factor App.power(short-circuit)/App.power(supply) will be calculated dependant of the selected supply- and short-circuited windings. It can also be chanched manualy.








Menu Data, Save The Add command causes the displayed measurement (load loss measurement and status) to be evaluated (extrapolated) and stored. It is thus available in the report. The counter in the status box is incremented every time a load loss measurement record is stored, and the newly stored measurement is added to the list in the bottom box. If the field is deactivated with measurement stopped, either the measurement is already stored or its data are invalid (e.g., in an overload condition). For the status to be correctly stored with the measurement, it must be input before storage or before performance of the measurement.





Menu Configuration, load loss test

When the Config command is issued, all configuration settings must be input before the individual load loss measurement is done.

Menu Documentation, docu about load loss test

With the Docu command, documentation on the load loss measurement can be stored, for example the test time, operator, result, etc.

Menu Data, History This command displays a list showing all stored measurements. A measurement can be selected in the lower field for viewing in the upper field. History (viewing database)


Menu File, exit The Exit command exits the load loss measurement and returns to the main screen.




Zero-sequence measurement


Select the item Measurement, zero-sequence measurement in the menu.

Function: In this measurement type, the short-circuit and no-load zero impedances of the individual windings are measured phase by phase. In three-phase transformers, the three phases are paralleled and measured all at once. When zero-sequence measurement is selected, the zero-sequence measurement screen appears:






For three-phase transformers, the Impedance line shows 3*(Urms/Irms); only Urms/Irms is displayed for single-phase transformers. The status field at left contains status and configuration boxes. In this way, the most important settings and adjustments for the zero-sequence measurement can be made quickly.


counter, which thus shows how many zero-sequence measurements have already been stored. Settings box: The type of zero-sequence measurement and the selected phase are determined in this box. The type

(short-circuit, no-load) influences only the title of the report printout. The wattmeter is configured on the basis of the phase selected to be fed. Only the selected phase is displayed on the screen.

Act. Supply: The winding to be fed and its selected tap are specified in these two popup boxes. Act. Short-circuit: The shorted winding and the selected tap are set in these popup boxes. Several windings can also be

selected. Nonexistent windings are not displayed. This information is independent of the information in the settings box.



Phase-neutral Voltages are measured phase-to-neutral. Averaging This button makes it possible to input the time over which the displayed average value is formed (1 to 64









Menu Data, save The Add command causes the displayed measurement to be stored. It is thus available in the report. The counter in the status box is incremented every time a measurement record is stored, and the newly stored measurement is added to the list in the bottom box. If the field is deactivated with measurement stopped, either the measurement is already stored or its data are invalid (e.g., in an overload condition).

Menu File, Memo The Memo command makes it possible to store a note on the stored measurement. This function can be selected with Add when measurement is stopped, before or after the storage operation, and can also be modified.




Menu Documentation, docu about zero-sequence test

With the Docu command, documentation on the zero-sequence measurement can be stored, for example the test time, operator, result, etc.

Menu Data, History This command displays a list showing all stored measurements. A measurement can be selected in the lower field for viewing in the upper field. History (viewing database)


Menu File, exit The Exit command exits the zero-sequence measurement and returns to the main screen.


Heat run


Select the item Measurement, heat run in the menu.

Function: In the heat run test, the transformer temperatures and losses are measured over an extended period of time. The TMS supports only the loss measurement! Measurement data are automatically stored at operator-selected intervals (each measurement stamped with time and date). A suitable third-party system capable of recording temperatures versus measurement time must be used for temperature measurement. An example is a Y-T chart recorder. The two data series are then correlated on the basis of the time data and evaluated. The result of the heat run test is then input as text in the dialog box Result and is accordingly available in the report. When heat run test is selected, the heat run screen appears:






The status field at left contains status and configuration boxes. As a result, setting and adjustment of the heat run test can be done quickly.

Counter: Every measurement added to the measurement file increments this counter, which thus shows how many

measurements have already been stored. Save period: The sampling interval is input in this box. For example, if the interval is set at 1 minute, the system

automatically stores one measurement every minute. (Values shorter than 1 minute, say 0.1 min, can be set.) Remark: The sampling interval shall not be shorter than the average time. This input must be confirmed with .

Elapsed time: The box Time displays the elapsed test time. (The display is reset by closing the heat run test with

Exit). Status: While a measurement is in progress, the Status box displays Active in red. Timer control: Auto: The timer ( and the sampling interval ) run synchronous with the measurement.

Manual: The timer ( and the sampling interval ) run regardless of the measurement and will be controlled

by and .










The Start command begins the measurement and starts the automatic sampling timer.


The measurement and automatic sampling timer are halted with the Stop command.

Menu Data, Memo The Memo command makes it possible to store a note in the heat run file.




Menu File,Documentation

With the Result command, the window is opened for input of the heat run test result.

Menu Measurement, show history



Menu Measurement, exit

The Exit command exits the heat run test and returns to the main screen.






Format of output files Heat run test values can be exported as comma separated values for further use. These datas are located in the subdirectory of the corresponding measurement.

File HEATRUN.CSV This file contains the same measurements in a CSV-compatible form (Comma Separated Value). The first line contains the field names; measured values are stored in the second and subsequent lines. This file can very easily be read into an external program (e.g., Microsoft Excel, Microsoft Access or the like) so that the data can be processed and the result of the heat run test obtained. The result is then input in the documentation dialog window. The file contains the following measurements: Date (dd.mm.yyyy) Time Total voltage Total current Total power

Example:

Date;Time;Voltage;Current;Power 12.5.1995;16:30:49;0.000000E+00;0.0000000E+00;0.000000E+00 12.5.1995;16:40:50;4.667410E+03;2.4012546E+02;8.138652E+03 12.5.1995;16:50:51;4.701310E+0003;2.39124E+02;8.239857E+03 etc.


Graphical display The measured data can be displayed as curve in a graphical display:

The graphic can be saved as bitmap file. Pressing the right mouse button on the graphic opens a small pulldown menu which allows to reset the zooming of the scope or to save the graphic. The graphic can be zoomed by holding down the left mouse button while moving the mouse to form a window on the graphic.

Measurement (measurement related) 61

Measurement (measurement related)

measurement related means : This mode is left as open as possible. Instead of defining the transformer, individual measurement configurations are predefined and measurements are then performed on the basis of these. Information about winding nomenclature, tap selection and ratings must be input as running text here, since the system does not recognize the transformer being measured. As a result, the test is quite versatile though somewhat more costly. This mode is particularly suitable for autotransformers, but also for all other applications where the transformer does not fit into the object under test scheme (more than six windings, etc.).

Test Before measurements can be performed with the TMS, a test must be initialized. This is done either by setting up a new test or loading an existing test. Only the selfcheck and the wattmeter visualization can be executed without initializing a test.

Inputting transformer data Now the transformer data are input.


Select the item Test, transformer data in the menu.

62 Measurement (measurement related)


The Yes radio button must be activated in the first line of the window. The input box for tap data is automatically closed. You are performing a test in the measurement related mode. In the second field, all transformer-specific data are input:

Popup box Rated frequency The rated frequency applicable to the transformer is selected in this box. Frequency-dependent constants are stored in the file TMS.COR and can be supplemented or modified if necessary.

Popup box Standard The standard applicable to the transformer is selected in this box. The calculation method used depends on this setting, for example conversion of no-load losses.

See also No-load measurement Load loss measurement

Popup box Conductor material The conductor material with which the transformer is wound appears in this box. The info box Temperature coefficient of resistance shows the material-dependent value used in calculating the load losses. Items in this popup box and the associated T.C.R. are stored in the file TMS.MAT and can be supplemented or modified if necessary.


Radio buttons Phases These buttons are used to define whether the OUT (object under test) is a single-phase or three-phase transformer. The measurement system is reconfigured appropriately for the measurements. If a single-phase transformer is selected, new radio buttons appear from which the active phase must be selected.

Popup box Standard temperature The information in this box defines at what temperature the load losses (for example) are to be calculated. This input is used as standard information for all measurements. If necessary, it can be overwritten in the measurement configuration for each measurement separately.


Popup box Temperature units The temperature units are defined in this box. The information applies to all subsequent dialog windows and displays. If the units are changed, the numerical value of the standard temperature in the preceding box is converted.

Input box Rated inductance The rated inductance is defined in this box. Depending on the standard, this information refers only to an item in the report or to the calculation of output data. The values for P1, P2 and k are retrieved from the core code table once this value and the rated frequency and core code are given. This input is used as standard information for all measurements. If necessary, it can be overwritten in the measurement configuration for each measurement separately. The inductance-dependent constants are stored in the file TMS.COR and can be supplemented or modified if necessary.

Popup box Core code The core material is defined in this box. Depending on the standard, this information refers only to an item in the report or to the calculation of output data. The info box displays the P1, P2 and k values for this core code; these are used in calculating the no-load losses according to ANSI or VDE. The material-dependent constants are stored in the file TMS.COR and can be supplemented or modified if necessary.


The remaining boxes in the dialog window (tap definitions) were closed when measurement mode was selected for the transformer definition.


Induced voltage test


Select the item Measurement, induced voltage test in the menu.

Function: In this measurement type, the voltage withstand capability between adjacent windings or phases is tested. A test voltage and test duration can be preselected. The timer starts when the measured values rise above the selected voltage, and the measurement in progress is displayed in the status box with the word Wait in red. The status box turns green and displays OK when the test duration has elapsed. The voltage can now be run down again and the measurement can be halted and stored. Note: If the voltage drops below the test voltage during the specified test duration, a message appears in the measurement window.

When the induced voltage test is selected, the measurement screen appears:



Green The value is correctly measured. Red The corresponding range is not optimally utilized, so the required accuracy is not

guaranteed. Remedy: The appropriate range must be selected.


The status field at left contains status and configuration boxes. In this way, the most important settings and adjustments for the induced voltage test can be made quickly.


counter, which thus shows how many induced voltage tests have already been stored. Act. supply: The winding, tap or phase(s) being fed are input as text in this input box. Test: The test duration and test voltage are set in these two popup boxes (confirm with ). The timer is

activated after the measurement is started and as soon as the measured voltage is higher than the input test voltage. This can be noted in the status display Wait... The elapsed test time is displayed in the box Time at voltage. The status changes to OK (green) as soon as the measurement time is greater than the input test duration.

Reset: This button resets the timer and the test voltage. Phase-phase Voltages are measured phase-to-phase.






Menu Measurement, Start

The Start command begins the measurement. The repetition rate is about 1.5 second. The timer function is activated.

Menu Measurement, Stop


Menu Data, Save The Add command causes the displayed measurement to be stored. It is thus available in the report. The counter in the status box is incremented every time a data record is stored. If the field is deactivated with measurement stopped, either the measurement is already stored or its data are invalid (e.g., in an overload condition).





Menu File,Documentation

With the Docu command, documentation on the induced voltage test can be stored, for example the test time, operator, result, etc.

Menu Data, show History



Menu File, exit The Exit command exits the induced voltage test and returns to the main screen.


No-load measurement


Select the item Measurement, no-load measurement in the menu.

Function: The losses of the transformer under no-load conditions are measured. What is more, harmonics up to order 15 can be measured in this measurement type. When no-load measurement is selected, the no-load measurement screen appears. Before a no-load measurement can be performed, however, the measurement must now be configured. This is done with the dialog window Configuration, no-load measurement.


Menu Configuration, no-load measurement


The configuration screen appears:

The active measurement configuration is displayed in the box Configuration Number The desired

configuration can be selected with the and buttons.

Pressing the button creates a new configuration. deletes the actual configuration.

The selected configuration is defined in the lower field. Data next to titles in bold type influence the calculations and corrections.


Supply: The winding and tap being fed are input as text in this input box. Connection: The configuration type of the fed winding is selected with these radio buttons. This setting is for

documentation purposes only and does not affect the measurement. Cooling: The cooling type is entered as text in this input box. Power: The rated power for the selected measurement is input in this box. Voltage: The rated voltage for the selected measurement is input in this box. The rated current is calculated from

the rated power and this input and displayed for information. 100% voltage: The voltage at which the selected measurement is to be started is input in this box.

The 100% current is calculated from the rated power and this input and displayed for information. (The current display can be updated by pressing on this box.)

Phase-phase: The input voltages are defined as phase-to-phase voltages.

The default is phase-to-phase voltage measurement. Phase-neutral: The input voltages are defined as phase-to-neutral voltages.

The default is phase-to-phase voltage measurement. Test at: The input in this box specifies at what percent of 100% voltage the measurement is performed. Inductance at xx% voltage: This box is used to input the inductance anticipated at the effective test voltage. The factors P1, P2 and k

are calculated from this information and displayed for information. Standard temperature: If necessary, the specified standard temperature can be overwritten in this input box. The specified

temperature is taken from the dialog box Transformer data. If the box Corrected is checked, no-load losses are corrected.

Guaranteed values: Current: The guaranteed no-load current is input in this box.

Losses: The guaranteed no-load losses are input in this box.


Calculation of the currents:

Configuration

Rated current 100% current

Single-phase

Rated current Rated powerRated voltage =

100% 100%currentRated power

voltage =

Three-phase Phase to neutral

Rated current RatedpowerRated voltage = * 3

100% 100% 3currentRated power

voltage = *

Three-phase Phase to phase

Rated current RatedpowerRated voltage

=

*

3

100%100% 3

currentRated power

voltage =

*

When no-load measurement is selected, the no-load measurement screen appears:

No-load measurement data (measured data and results calculated according to the selected standard) are displayed in the measurement window with the following informational features:


Green The value is correctly measured. Red The corresponding range is not optimally utilized, so the required accuracy is not

guaranteed. Remedy: The appropriate range must be selected. If Loss power corr. is red, the conditions of the standard are not satisfied (RMS voltage and mean voltage differ by more than 3%).


The status field at left contains status and configuration boxes. In this way, the most important settings and adjustments for the no-load measurement can be made quickly.

Counter: Every measurement added to the database, for example with the Add command, increments

tms manual e

Documents