Schweitzer Engineering Laboratories SEL-311C - Figure 2.15 SEL-311 C Line Protection through a Delta-Wye Transformer Using Compensator Distance Elements

2.18
SEL-311C Relay Instruction Manual Date Code 20060320
Installation
SEL-311C AC/DC Connection Diagrams for Various Applications
Use compensator distance elements for line protection through a delta-wye transformer.
Voltage VS does not need to be connected.
Figure 2.15 SEL-311C Line Protection Through a Delta-Wye Transformer Using Compensator Distance Elements
52
52
- -
- -
LINE
TRANSFORMER BANK
Forward Tripping Direction
A B C
SEL-311C Relay
IA OUT101
OUT102 OUT103 OUT104 ALARM
IN101 IN102
IB IC IP VS NS
NVCVBVA
Trip Circuit Close Circuit Breaker Failure Trip Circuit Comm.- Assisted Trip Scheme
Comm.- Assisted Trip Scheme to Annunciator, RTU, or SEL Communications Processor Breaker Status
TC Trip Coil CC Close Coil 86 Lock Out TX
52A
52B
86B
52A
RX
(–) (–) (–) (–)
(+) (+) (+) (+) (+) (+) (+) (–) (–)