Siemens 7SR11 User Manual

7SR11 & 7SR12 Description Of Operation
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©2012 Siemens Protection Devices Limited
7SR11 and 7SR12
Description of Operation
Document Release History
This document is issue 2012/02. The list of revisions up to and including this issue is:
2012/02 AC auxiliary power supply added
2012/01 Software Maintenance
2011/06 Software Maintenance
2010/04 Amendments following PLM review
2010/02 Document reformat due to rebrand
2009/09 Format and relay fascia revised.
2009/04 First Issue
Software Revision History
2012/01 7SR11 2436H80003 R2a-2a
7SR12 2436H80004 R2a-2a
Software Maintenance
2011/06 7SR11 2436H80003 R2-2
7SR12 2436H80004 R2-2
Software Maintenance
2009/04 2436H80003R1g-1c 7SR11
2436H80004R1g-1c 7SR12
First Release

Siemens 7SR11 Specifications

General

Brand	Siemens
Model	7SR11
Category	Relays
Language	English

Summary

Section 1: Introduction

Section 2: Hardware Description

2.4 Power Supply Unit (PSU)

2.5 Operator Interface/ Fascia

Description of relay interface, LCD, and labels for product information.

2.6 Current Inputs

2.11 Self Monitoring

Overview of relay self-monitoring features, including watchdogs and health checks.

Section 3: Protection Functions

3.1 Current Protection: Phase Overcurrent (67, 51, 50)

Details on phase overcurrent elements, measurement methods, and directional control.

3.2 Current Protection: Derived Earth Fault (67N, 51N, 50N)

Explanation of derived earth fault protection, including directional control and time-delayed elements.

3.3 Current Protection: Measured Earth Fault (67G, 51G, 50G)

Details on measured earth fault protection, covering directional control and time-delayed elements.

3.4 Current Protection: Sensitive Earth Fault (67SEF, 51SEF, 50SEF)

Info on sensitive earth fault protection, including directional control and time-delayed elements.

3.5 Current Protection: High Impedance Restricted Earth Fault - (64H)

3.11 Voltage Protection: Phase Under/Over Voltage (27/59) – 7SR12

Info on phase under/over voltage elements, including measurement modes and blocking conditions.

3.12 Voltage Protection: Negative Phase Sequence Overvoltage (47) - 7SR12

3.13 Voltage Protection: Neutral Overvoltage (59N) – 7SR12

Section 4: Control & Logic Functions

4.1 Auto-Reclose (79) Function

Covers auto-reclose sequences, configuration menus, and protection settings for various fault types.

4.2 Manual CB Control

Details on initiating manual close commands, CB control latching, and delay settings.

4.4 Quick Logic

Section 5: Supervision Functions

5.1 Circuit Breaker Failure (50BF)

Details on circuit breaker fail function, its time delays, and initiation sources.

5.2 VT Supervision (60VTS) – 7SR1205 & 7SR1206

Info on VT supervision for detecting 1, 2, or 3 phase failures, including settings and reset conditions.

5.3 CT Supervision (60CTS)

Methods for detecting CT failures, including supervision for 7SR11 and 7SR12 models.