Section 1: Introduction; Current Transformer Circuits; External Resistors; Description - Siemens 7SR45 Argus User Manual

Section 1: Introduction

This manual is applicable to the following relay:
• 7SR45 Argus Self Powered/Dual Powered Non-Directional Overcurrent and Earth Fault Relay
General Safety Precautions
1.1

Current Transformer Circuits

The secondary circuit of a live CT must not be open circuited. Non-observance of this precaution can
result in injury to personnel or damage to equipment.
1.2

External Resistors

Where external resistors are connected to the relay circuitry, these may present a danger of electric
shock or burns, if touched.
1.3

Description

7SR45 Argus Self Powered/Dual Powered Non-Directional Overcurrent and Earth Fault Relay is developed using
the latest generation of hardware technology and is available in multiple variants depending on the following:
• CT ratings (1 A/5 A)
• Auxiliary Power supply
• Communication configuration
• Binary Input
• Binary Output
• Local/remote Flag Indicator
7SR45 Argus is a member of Siemens Reyrolle
7SR45 Argus Self Powered/Dual Powered Non-Directional Overcurrent and Earth Fault Relay is housed in a
4U high, size 4 non draw-out case and provides protection, monitoring, and instrumentation functions with
integrated input and output logic and fault reports.
The relay functionality can be configured via a front USB port for local PC connection or rear electrical RS485
(optional) port for remote connection. By using the Reydisp Evolution software, the user can update the settings
and view the fault records (trip log) and the event records (event log).
7SR45 Argus Self Powered/Dual Powered Non-Directional Overcurrent and Earth Fault Relay support the
IEC 60870-5-103 and Modbus communication protocols based on the ordering option.
7SR45 Argus Self Powered/Dual Powered Non-Directional Overcurrent and Earth Fault Relay can indicate the trip
with local and remote flag indicator based on the ordering option.
NOTE:
In this Technical Manual, the 7SR45 Argus Self Powered/Dual Powered Non-Directional Overcurrent and
Earth Fault Relay will be referred as 7SR45 Argus Relay.
©2018 Siemens Protection Devices Limited
Chapter 1 - 7SR45 Description of Operation
®
protection devices Argus product family.
Chapter 1 Page 7 of 48