vlf ac hipot testers

www.HVhipot.com Mail: [email protected] MSN: [email protected] Tel: +86-27-83564306 JangXin Road 17, Economic Development Zone, Jianghan District ,WuHan

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GDVLF SERIES

VLF AC Hipot Testers

www.HVhipot.com

Tel: +86-27-83564306

MSN: [email protected]

Mail: [email protected]


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WARNING

The following instructions are used by qualified person only to

avoid electrical shock, do not perform any service other than

contained in the operation instructions unless you are qualified

to do so.

Hvhipot Corporation assume no liability for the opration of this

instrument in an unsafe manner. This instrument generates and

delivers high voltage.Always be extremely careful when using

this instrument or any high voltage device.Read this manual

completely and observe oprating precautions before operating

the instrument.


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Limited Warranty

The warranty period for this series is one year from the date of shipment ,please

refer to your invoice or shipping documents to determine appropriate

warranty dates. Hvhipot corporation warrants to the original purchaser

that this product will be free from defects in material and workmanship

under normal use.Thoughout the warranty period, provide that such

defects ars not determined by Hvhipot to have been caused by abuse,

misuse, alteration,improper installation ,neglect or adverse environmental

condition.Hvhipot is limited solely to repair or replacement of this

instrument during the warranty period.

Maintenance

To keep the instrument clean, wipe the case with a damp cloth and

detergent. Do not use abrasives or solvents.

Applications

Packing

One Discharge rod

One high voltage wire

One Low voltage wire

One Ground Cable

One Interconnect Cable

Optional Applications

Capacitor (depend on request)

Note: It is essential that should not exceed the rated

capacity . When Capacitance of tested object less

than 0.05 uF, will affect waveform output，therefore,

can opt for one or two 0.1 uF capacitor provided by

thecompany to added capacitor.


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General Information -------------------------------------- 1

Features --------------------------------------------------- 2

Panel Introduction ---------------------------------------- 3

Technical Specifications --------------------------------- 5

GDVLF Models ------------------------------------------- 6

Wiring Methods ------------------------------------------ 8

Operation Procedure ------------------------------------ 10

TABLE OF CONTENTS

General Information

A very low frequence hipot is just an AC output tester but with an

output frequency of 0.1 Hz or lower rather than 50/60Hz. Although

the frequency is very low, it is still an alternating current with polarity

reversals every half cycle. At 0.1 Hz output, rather than 60Hz, it

takes 600 times less current and power to apply an AC voltage to a

capacitive load, like a long cable.

The GDVLF Series of VLF-AC hipots apply the device with a

microprocessor controlled, which will control voltage automatic,and

can also be adjusted for manual when in the process of automatic

voltage boost .Our advanced electronic design provides you with the

most portable, to use VLF hipots available. An big LCD screen and

onscreen instruction system can display output Sinusoidal , and the

in-built thermal printer willprint the test report, make the test process

is easy to operate.


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Features

• Measurement accurate;

• Overvoltage protection: If the output voltage exceeds the limit users

set , the instrument is supposed to shut-down itself, react within 20ms;

• Overcurrent protection: it is high-low voltage dual protection in the

design, theaccurate shut-down protection can be made according to the

set value at high voltage side; If the current on low voltage side exceeds

the rated current, the instrument will take shut-down protection, the

actuation time are both less than 20ms.

• A high voltage output protective resistor is provided in the voltage

boost body in the design and this eliminates the need of additional

protective resistor connected outside.

• AC testing does not degrade good cable insulation.

• No traveling waves are generated during testing.

• Harmful space charges are not injected into the cable insulation.


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Panel Introduction

Ⅰ . Controller Panel

Numbers Panelkeys Function

1 Function keyThe function is prompted at corresponding location at

prompt column on the display.

2 Switch

power switch with inbuilt indicator light, which

illuminates upon open and extinguishes upon close.

3 LCD It displays test data and output wave form.

4 AC 220V The power input socket with inbuilt fuse tube.

5 Printer print the test report

6 Output- Ⅰ

The output multi-core socket, which is connected with

the input multi-core socket when being used.

7 Output- ⅡA optional socket for the testing, of which the rated

Voltage exceeds 50kV.

8 ContrastThe contrast adjusting knob, which is used for the

adjustment of contrast of the LCD.

9 GroundGrounding terminal, which is connected with ground

when being used.


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Ⅱ . Booster Structure

Ⅲ . Description Of Screen Display


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Technical Specifications

Maximum Output Voltage30/40/50/60/80kV Peak (available

upon request)

Output Modes

AC Hipot (VLF) Sinusoidal and load independent.

Burn, Cable Fault Conditioning Mode

VLF Test FrequenciesSelectable 0.1 Hz, 0.05Hz,0.02

Hz, (Additional Frequencies available upon request)

Main Supply 220V，50Hz AC+/-5%

Measurement Accuracy ≤3，

Voltage Waveform Distortion ≤5，

Positive And Negative Voltage Peak Errors ≤3，

Duty Cycle Continous

Metering

Voltage - True RMS and/or Peak, 0.1kV ± 1%

Current – 0.1mA ± 1%

Environmental -10° C to 40° C


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GDVLF Models

TypeOutputVoltagePeak

Load Capacity

Control Unit Booster

Dim.(cm)

Wt(kg)

Dim.(cm)

Wt(kg)

GDVLF-30/1.1 30kV1mF @ Up to 5.5uF at

reduced frequency36×25×21 6 33×18×39 25


reduced frequency36×25×21 6 33×18×39 28

GDVLF-50/1.1 50kV1mF @ Up to 5uF at reduced frequency

36×25×21 6 37×24×39 45

GDVLF-60/1.1 60kV1mF @ Up to 5uF at reduced frequency

36×25×21 633×18×3933×18×39

25+25


reduced frequency36×25×21 6

33×18×3937×24×39

25+45

>> Operating Tips

1. Power supply requirement: AC50Hz, 220V, stability of frequency: fluctuation less

than 0.5%.

2. When using it, the capacitance of the sample should not exceed the rated capacity

of the instrument. The overlow capacitance of the sample will affect the output wave

form. If the capacitance is less than 0.05µF, the instrument cannot output normally.

3. When using it, it is prohibited to boost voltage without load, or to connect with

resistive load.


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Wiring Methods

Ⅰ . Single Booster Connection

The mothod of wiring shall be according to the following picture, if the

rated voltage is less than or equal to Very low frequency of 50kV or when

the booster grade 1 is separately used in the method of connection in

series .click Single Connection at Column of Parameter Setting after the

power of equipment is put on.


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Ⅱ . Connection In Series

The user should adopt method of connection in series when the rated

Voltage exceeds 50kV (Click Connection In Series at Prompt Column of

Parameter Setting after the power of equipment is put on). The mothod

of wiring shall be according to the following picture.


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Operation Schematic

Ⅰ .Cable Wiring Method

Ⅱ . Generator Connection Method


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Operation Procedure

1.Open, close and reset

After conneting the wiring of all the circuits, the power switch can be put

on. The instrument will automatically enter into the limit setting interface

as shown in figure 1,with the microcomputer is electrified and reset.

Caution:

• The power should be shut-down when on wiring, removal of lines or

temporary non-use of the instrument.

• If there is no display on the screen, the first check should be made on

the fuse tube ,because the power socket is provided with fuse tube.

Figure 1


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2. Limit parameter setting

On limit setting interface as shown in figure 1, the user can set frequency,

test time and voltage, overcurrent protection on high-voltage side and

overvoltage protection value according to test requirement. The methods

are as follows:

a. Click “Selection” key, and the special selective box can be shifted

among the parameters in cycle. The selected parameters can be modified

through “data modification”(change) key.

b. Click “Change” key and the parameter selected by the special box can

be modified in cycle.

c. Click “Return” key, the instrument will enter into voltage boost standby

interface as shown in figure 2 .


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• There are three options for the frequency: 0.1 Hz, 0.05 Hz and 0.02 Hz.

• Timing modification scope: 0-99 mins. It specified the time of test.

• Range of test voltage is from 0 kV to rate voltage. When the voltage of the instrument reaches to this set value, it will stop boosting, maintain at

this peak value and output uniform amplitude sine wave.

• The setting scope of current protection is from 0 mA to the rating.

It specified the upper limit of the current of the sample. If the current

exceeds this set value, the instrument will automatically cut off the output

and shut down.

• The voltage protection is from 0 kV to the rating. It specified the

upper limit of the voltage. In case the voltage exceeds the set one, the

instrument will automatically cut off the output and shut down.

• "Single" and "Series" connection. Selecting "Single" means that one

of both boosters will be respectively used; Selecting "Series" means that

both boosters will be jointly used according to requirements.


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3. Standby Interface a. Click “Boost” key, the instrument will enter into automatic boost

procedure.

b. Click “Setting” key, the instrument will return to set limit sub-interface

as shown in figure 2 to re-modify parameter.

c. Click “Check” key to check the test data in the last nine times.

Figure 2


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4. Automatic boost

Click “Boost” key as shown in Figure 2, the instrument will enter into

boost test under microcomputer control according to the procedures

as follows:Self > Check > Boost > Uniform > Amplitude Output >

Shutdown

The instrument outputs a detecting voltage to check the system. the

instrument will boost or shut-down depend on the condition is normal

or abnormal. The screen will display “load unconnected”, when the

booster or the capacitor sample (DUT) is not connected or there is a

failure with the instrument.

During boost process, click “Pause” key as shown in Figure 4 , can

pause the boost process, and the instrument will have uniform amplitude

output. At the same time, the key will be automatically turned into “boost”

key, which can be re-clicked to continue the boost process until the set

voltage of the instrument is reached.

Click “Timing” key in boost process, the instrument will begin timing

process, or you can wait until the voltage is increased to the set one,

then the instrument will count time automaticly. Then the “Timing” key

will be turned into “Stop” key as shown in Figure 4.


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Figure 3

Figure 4


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5. Voltage Adjustment

In case the output voltage cannot meet the requirement, click “Up”(slight

increase) or “Down” (slight decrease) keys to adjust the voltage.

Figure 5


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6. Shut-down

Two methods of shut-down:

a. Timing shut-down: The instrument will shut down at specified set time.

b. Manual shut-down: Click “Stop” key can stop the instrument.

After shut-down, the prompt interface “Test Passed” will appear as

shown in Figure 6 , represent of passing the test , if not, because of exist

no electrical discharge，overvoltage or overcurrent protection on the DUT

(sample).

Caution:

• Additionally there are two abnormal shut-down: overvoltage and

overcurrent protective shut-down . the instrument will automatically cut

off the output, then execute the historical data storage. In case of shut-

down, the prompt interface will appear as shown in Figure 7.

7. Print

Click “Print” key as shown in Figure 6, the user can print the data as test

report. On historical data checking status, click “Print” key, the user can

print the historical data.


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Figure 6

Figure 7


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8. Historical Data Check

Data on condition of timing shut-down, click key “Stop” shut-down,

overvoltage and overcurrent protective shut-down , will be stored as

historical data. Data of last nine times will be stored. Click the “Check”

key as shown in Figure 1, the user can check the historical data of tests

in the last nine times.


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vlf ac hipot testers

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