Chapter 5 - 7SR45 Installation Guide
© 2018 Siemens Protection Devices Limited
Chapter 5 Page 12 of 12
Relay
Applications
Description
Connections
7SR45 Argus
Relay with
Phase and
CBCT
Measurement
1. CT circuits shown are
connected to 1 A or 5 A of
7SR45 Argus Relay.
2. CT and Earth connections are
typical only.
3. Measures the phase current
and earth current of the Primary
CT only.
4. Application shows the use of
50/51/50N/51N/50LC/50G/51G
protection functions.
5. Remote trip via Communication
(through BO with Auxiliary input
present) and Binary input is
possible.
IL1 IL2 IL3
24 V to 60 V DC
60 V to 240 V DC/AC
Standard release
BO
L
N
IL1
IL2
IL3
IL4
Battery
7SR45
Figure 1-17
7SR45 Argus Relay with Phase and CBCT Measurement Application
7SR45 Argus
Relay with
Earth Fault
Application
1. CT circuits shown are
connected to 1 A or 5 A of
7SR45 Argus Relay.
2. CT and Earth connections are
typical only.
3. Measures the earth current of
the Primary CT only.
4. Application shows the use of
50G/51G protection functions.
5. Remote trip via Communication
(through BO with Auxiliary input
present) and Binary input is
possible.
IL1 IL2 IL3
24 V to 60 V DC
60 V to 240 V DC/AC
Standard release
BO
L
N
IL1
IL2
IL3
IL4
Battery
7SR45
Figure 1-18
7SR45 Argus Relay with Earth Fault Application