Siemens Argus 7SR21 - Page 511

7SR210 & 7SR220 Installation Guide
Unrestricted ©2018 Siemens Protection Devices Limited Page 35 of 36
7.7 Typical Connection: 7SR22 Voltage Transformer
Configurations for Check Synchronisation
Relay Voltage
Configuration
Description Connection
Vbn line,
Vbn bus,
25 Check Sync,
A21
A22
A27
A28
A B C
N
n
a b c
A B C
N
n
a b c
V Line
V Bus
Vab line,
Vab bus,
25 Check Sync,
A21
A22
A27
A28
A B C
N
n
a b c
A B C
N
n
a b c
V Line
V Bus
Figure 7.7-1 7SR22 Applied to Check Synchronisation