Siemens Argus 7SR21 Technical Manual page 511

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