7SR45 Description of Operation
© 2017 Siemens Protection Devices Limited Chapter 1 Page 6 of 34
Section 1: Introduction
This manual is applicable to the following relay:
• 7SR45 Self Powered 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 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).
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