Overview - Siemens Reyrolle 7SR45 Argus Device Manual

Applications

5.1 Overview

5.1

Overview

7SR45 self powered/dual powered relay is a numerical overcurrent and earth-fault protection relay primarily
intended for secondary distribution in electrical networks.
The 7SR45 Argus relay is designed to operate with/without an auxiliary supply. The relay is powered primarily
from the auxiliary voltage even though all other power sources are available.
In the absence of auxiliary voltage, the relay is powered by CT input.
The relay offers definite-time and inverse-time overcurrent and ground fault protection functions in accord-
ance to IEC and ANSI standards.
The 7SR45 relay is targeted for the following applications:
•
Protection relay for Ring Main Units (RMU)
•
Backup protection relay for the medium-voltage applications
•
Protection applications in remote locations where auxiliary supply is not available
•
Control and relay panels refurbishment of old electromechanical protection relays
[dw_fct-diagram_7SR45-argus-relay_after49Fn, 1, en_US]
Figure 5-1
The relay provides 2 setting groups - Group number (Gn) 1 to 2 which can both be viewed/edited via the fascia
or PC Software tool.
18 One setting group is available for the MLFB 7SR450[1/3]-xGA10-1AA0 variant.
90
Functional Diagram
18
Reyrolle, 7SR45, Device Manual
C53000-G7040-C101-2, Edition 09.2020