Section 1: Introduction; Current Transformer Circuits; External Resistors; Description - Siemens 7SR10 Argus Series Manual

Section 1: Introduction

This manual is applicable to the following relay:
• 7SR10 Overcurrent 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
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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
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shock or burns, if touched.
1.3

Description

The 7SR10 Overcurrent relay is developed by using the latest generation of hardware technology and is available
in multiple variants depending on power supply, binary input/output configuration, voltage input, and data
communication facility. 7SR10 is a member of Siemens Reyrolle
The 7SR10 overcurrent relay consists of non directional functions and with additional voltage inputs providing
directional functions (based on the ordering option).
The 7SR10 Overcurrent relay is housed in a 4U high, size 4 non draw-out case and these relays provide
protection, monitoring, instrumentation, and metering with integrated input and output logic, data logging and fault
reports.
Communication access to the relay functionality is via a front USB port for local PC connection or rear electrical
RS485 (optional) port for remote connection.
©2018 Siemens Protection Devices Limited
7SR10 Description of Operation
®
protection devices Argus product family.
Chapter 1 Page 8 of 77