SEL Winding Compensation Settings Program Revision 1.0

This EXCEL spreadsheet was developed by:

Dean HardisterField Application Engineer (Retired)Schweitzer Engineering Laboratories, Inc.(704) 504-4105

Disclaimer:This program is provided at no cost to SEL customers. NO EXPRESS OR IMPLIED WARRANTIES(INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR PARTICULAR PURPOSE) APPLY FOR THIS PROGRAM.SEL Customers are entirely responsible for their use of and reliance on this program and any datacontained therein, including without limitation any algorithms.

(INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR PARTICULAR PURPOSE) APPLY FOR THIS PROGRAM.

SEL Transformer Differential Winding Compensation Settings Calculator

Winding 1 Winding 2 Winding 3 Winding 4

CT 1 CT 2 CT3 CT4 Reference Winding

330 Degrees 150 Degrees 300 Degrees 270 Degrees

TransformerPhase

Transformer +CT Phase

W1CTC = 0 W2CTC = 6 W3CTC = 0 W4CTC = 10

Instructions:

Click the appropriate Winding connections, CT connections, Phase Rotation, and Reference Winding settings.Then click START.Click the UP (clockwise) or DOWN (counterclockwise) arrows to change the diagrams to match the transformer configuration.Click the Transformer Connections or Connection - Phase Shift buttons for help.If during running of the program, an error message pops up, click END to close the message box, press CTRL-r, and start over.

See disclaimer on Sheet 1 (ReadMe tab of this workbook).

A

B

C a

b

ca b

c

a

b

c

DELTAWYEDABDACWYE

DELTAWYEDABDACWYE

DELTAWYEDABDACWYE

DELTAWYEDABDACWYE

ABC RotationACB Rotation

Winding 1Winding 2Winding 3Winding 4

START

HELP Transformer Connections

HELP Connection - Phase Shift

DO NOT MODIFY ANYTHING ON THIS SHEET!!!

W1Conn = DW2Conn = YW3Conn = YW4Conn = YCT1Conn = YCT2Conn = YCT3Conn = DACCT4Conn = Y

PhRot = ABCRefWind = 1