H.21
Date Code 20170601 Instruction Manual SEL-387-0, -5, -6 Relay
Protection Application Examples
Transformer Winding and CT Connection Compensation Settings Examples
The compensation settings of Table H.4 assume that the Winding 1 side of the
transformer is connected to relay Terminal W1 and the Winding 2 side of the
transformer is connected to relay Terminal W2. These settings apply for all
standard phase-to-bushing connections shown in Table H.2. In each of these
phase-to-bushing connections, the order of the phase connections (A, B, C)
matches the order of the bushings (H1, H2, H3).
References
Further discussion on selecting transformer compensations settings can be
found in the technical paper, Beyond the Nameplate – Selecting Transformer
Compensation Settings for Secure Differential Protection by Barker Edwards,
David G. Williams, Ariana Hargrave, Matthew Watkins, and Vinod K. Yedidi.
YDAC/Yd1 11 0
YDAB/Yd11 1 0
DABDAB/Dd0
DACDAC/Dd0
00
YY/Yy0 11 11
Table H.4 Quick Settings Guide for Common Transformer Configurations and
Standard Connections (Sheet 2 of 2)
XFMR Connection
W1CTC
(Winding 1)
W2CTC
(Winding 2)
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