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Instructions

BE1-87T Settings Record Without Fault Calculations - Rev. A

Disclaimer

This spreadsheet presents information about Basler Electric relays. It has been

prepared as a convenience to our customers, and there is no expressed or

implied commitment to maintain or update this file. In developing this

software, Basler has attempted to offer the most accurate information possible.

Basler does not warrant that the software is free from bugs, errors or otherprogram limitations. Users are encouraged to consult with a Basler Electric

representative to determine the accuracy of the data and results for the specific

use or purpose of the user.

The spreadsheet is not password protected, to enable the user to modify it

or to customize if for the users own purposes.

By use of this program, the user agrees that Basler disclaims all warranties of

noninfringement of third party rights, quality, performance, merchantability, or

fitness for a particular purpose. The user assumes the entire risk as to the

quality and performance of the software. In no event will Basler be liable for

any indirect, special or consequential damages.

In the event of any litigation regarding this software, the user agrees that venue

shall be in the State of Illinois.

Purpose of this Spreadsheet Template

This spreadsheet template has been created to assist users of the Basler

Electric 87T Transformer Differential Relay to perform the settings calculations

contained in Section 4, Installation, of the Instruction Manual. The calculations

are based upon Procedure 2.

The spreadsheet is also useful as a learning tool for obtaining greater

understanding of the application of transformer differential protection. The usercan selectively try different combinations of parameters to see how each

parameter affects the others in coming up with the settings for the relay.

There are two versions of this template. The first version, 87twoflt.xls, has fields

for you to enter the fault currents that you calculate from your own fault study.

This version of the relay can be used for Delta/Wye, Delta/Delta, or Wye/Wye

transformers. The second version, 87twflt.xlt, has fields for entering appropriate

system and transformer impedance data and will calculate the fault currents for

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Instructions

you. This version is limited to Delta/Wye transformers and requires that you

have the Analysis Toolpak Add-In installed in Excel. The fault calculations are

located on a hidden sheet named "scratch".

Please feel free to modify these spreadsheets as necessary to optimize them

for your own use.

How to use this Tool

Instructions for creating settings files for your BE1-87T relay using the Excel

file:

1. Start Excel and create a new file based upon this file by clicking

File/Save As on the menu after selecting 87Twoflt or 87Twflt.

2. On the DATA tab, fill in the data fields for the transformer that you are

calculating settings for.

3. Once you have filled out the data sheet, click over to the calculated values

tab and fill in the desired settings in the cells highlighted in yellow.

4. Look for warning messages that indicate problems with the parameters that

were entered. If necessary, click back over to the Data tab and adjust

parameters as necessary to make corrections.

Revision Notes:

Rev. A. Removed the CT internal resistance from the CT performance

calculations. The technique used in this spreadsheet for calculating the CT

performance uses the ANSI accuracy class. Since the accuracy class rating is

based upon the CT's terminal voltage, the CT's internal resistance should not

be included in the saturation factor calculation. This technique tends to be

conservative. for greater accuracy, it is recommended that the user determine

CT performance by examining the excitation curves.

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Instructions

5/16/2009 Converted from template files to XLS files.

Basler Electric Company, 12570 State Route 143, Highland, Illinois 62249-1074 USA

Phone: 618/654-2341 - Fax: 618/654-2351 - Website: www.basler.com

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DATA

87T SETTINGS BASED ON PROCEDURE TWO

Without Fault CalculationsThis version of the 87T settings calculation workbook template uses fault current magnitudes calculated

in your own fault study and entered on the data sheet for CT performance calculations. You do not need

the Analysis Toolpak Add-In installed in Excel to use this version of the template.

Fields highlighted in yellow are for data entry.

SPECIFICATIONS VALUE INPUT 1 INPUT 2

SYSTEMKVLL (BASE) 69 12.47

3PH, input 2 side fault, EXTERNAL (F1) 1916 10603


PH-G, input 2 side fault, EXTERNAL (F1) 1171 11231


TRANSFORMER

WINDING CONFIGURATION (D OR Y) d yMVA (self cooled - OA) 12

MVA (forced cooled - FA) 20

MVA (expected max load) 20

LTC range +/- % 10

CTsPRI CURRENT RATING (FULL WINDING) 600 1200

PRI CURRENT RATING (TAPPED) 300 800

SEC CURRENT RATING 5 5

CT ACCURACY CLASS (volts @ 20X In) 400 800

CT CONNECTION (D or Y) y yONE WAY LEAD RESISTANCE (Ohms) 0.7 0.7

121758817.xls.ms_office Page 4 12/25/2012

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CALC. VALUES

Fields highlighted in yellow are for entry of settings.

Fields highlighted in white are carried over from the data sheet.

Fields highlighted in blue are calculated values.

SPECIFICATIONS INPUT 1 INPUT 2 WARNINGSTRANSFORMER (from DATA SHEET)

LL 69.00 12.47

Winding Configuration d y

MVA Maximum Load 20.00

Current @ Expected Max Load 167 926

FAULT CURRENTS





CT PERFORMANCE

CT Connection y y

CT Ratio (Turns) 60 160

CT accuracy class 400 800

CT effective class (x Full CTR/Tapped CTR) 200 533

Secondary Current in CT (Max Load) 2.79 5.79 CT exceeds nominal secondary rating

One way leads resistance (ohms) 0.7 0.7

CT voltage for 3ph fault, input 2 side, external (F1) 22.35 46.39

CT voltage for 3ph fault, input 1 side, external (F2) 0.00 0.00

CT voltage for ph-g fault, input 2 side, external (F1) 13.66 98.27

CT voltage for ph-g fault, input 1 side, external (F2) 0.00 0.00

Max.CT voltage (external faults) 22.35 98.27

Saturation Factor for external faults 0.11 0.18

RELAY SETTINGS 0 0

Tap Setting Calculations

CT connection current conversion factor 1.00 1.00

Current in Relay (Max Load) 2.79 5.79

Phase compensation jumper selection y d

Relay current conversion factor 1.00 1.73

Effective relay current (Max Load) 2.79 10.02Check tap adjust spread (must be

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