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

Self powered overcurrent and earth fault relay

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Section 1: Introduction

This manual is applicable to the following relay:

7SR45 Self Powered Overcurrent and Earth Fault Relay

General Safety Precautions

1.1

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

Where external resistors are connected to the relay circuitry, these may present a danger of electric

shock or burns, if touched.

1.3

7SR45 self powered overcurrent and earth fault relay is developed using the latest generation of hardware

technology and is available in two variants depending on the CT ratings (1 A/5 A). 7SR45 is a member of

Siemens Reyrolle

protection devices Argus product family.

7SR45 self powered 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, events

(Event Log), and fault records (Trip Log).

The relay functionality can be configured via a front USB port. By using the Reydisp evolution software, the user

can update the settings and view the fault records (Trip Log) and events (Event Log).

7SR45 Description of Operation

Chapter 1 Page 6 of 34

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