Siemens 7SR21 Manual
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Siemens 7SR21 Manual

Non-directional. directional. overcurrent relay
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7SR21 Non-Directional
7SR22 Directional
Overcurrent Relay
Document Release History
This document is issue 2010/05. The list of revisions up to and including this issue is:
2010/05
Additional Comms modules option of (RS485 + IRIG-B) and (RS232 + IRIG-B) and typographical
revisions
2010/02
Document reformat due to rebrand
2009/09
Third Issue. Software revision 2435H80004/5 R4b-4
2008/07
Second issue. Software revision 2435H80004/5 R3d-3.
2008/03
First issue
Software Revision History
2009/09
2435H80004/5 R4b-4
2008/07
2435H80004/5R3d-3
2008/03
2435H80004/5R2c-2b
The copyright and other intellectual property rights in this document, and in any model or article produced from it
(and including any registered or unregistered design rights) are the property of Siemens Protection Devices
Limited. No part of this document shall be reproduced or modified or stored in another form, in any data retrieval
system, without the permission of Siemens Protection Devices Limited, nor shall any model or article be
reproduced from this document unless Siemens Protection Devices Limited consent.
While the information and guidance given in this document is believed to be correct, no liability shall be accepted
for any loss or damage caused by any error or omission, whether such error or omission is the result of
negligence or any other cause. Any and all such liability is disclaimed.
©2010 Siemens Protection Devices Limited
7SR21 & 7SR22 Data Communications
CTS-I Supervision. Undercurrent 37G & 37SEF. Vx U/O Voltage.
46BC U/C. Comms Settings. Waveform Storage Settings. Fault
Storage Settings. Energy Storage. Trip test function. Local/Remote
modes. Settings ranges extended. Protocol changes.
Demand records. Optional DNP3.0 data comms.
First Release

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Summary of Contents for Siemens 7SR21

  • Page 1 Limited. No part of this document shall be reproduced or modified or stored in another form, in any data retrieval system, without the permission of Siemens Protection Devices Limited, nor shall any model or article be reproduced from this document unless Siemens Protection Devices Limited consent.

  • Page 2: Table Of Contents

    7SR21 & 7SR22 Data Communications Contents Section 1: Introduction ..........................4 Section 2: Physical Connection......................5 2.1 Communication ports ........................5 2.1.1 Standard USB Interface ....................5 2.1.2 Standard RS485 Interface....................6 2.1.3 Optional Fibre Optic Interface ..................7 2.1.4 Optional Rear RS485 + IRIG-B Interface..............11 2.1.5...
  • Page 3 7SR21 & 7SR22 Data Communications List of Figures Figure 2-1 Communication to Front USB Port ..................6 Figure 2-2 Communication to Multiple Devices from Control System using RS485......6 Figure 2-3 Communication to Multiple Devices using Fibre-optic Ring Network ........10 Figure 2-4 Communication to Multiple Devices from Control System and Laptop using Fibre-optic Star Network ....................10...

  • Page 4: Section 1: Introduction

    7SR21 & 7SR22 Data Communications Section 1: Introduction The relay can communicate with control and automation systems, or with PCs running Reydisp Evolution software, to provide operational information, post-fault analysis, settings, interrogation and editing facilities. This section describes how to use the Communication Interface with a control system or interrogating computer.

  • Page 5: Section 2: Physical Connection

    Any or all ports can be mapped to the IEC60870-5-103, MODBUS RTU or DNP 3.0 protocol at any one time. Siemens Protection Devices Limited can provide a range of interface devices, please refer to product portfolio catalogue. Full details of the interface devices can be found by referring to the website www.siemens.com/energy...

  • Page 6: Standard Rs485 Interface

    7SR21 & 7SR22 Data Communications Figure 2-1 Communication to Front USB Port 2.1.2 Standard RS485 Interface The RS485 communication port is located at the rear of the relay and can be connected using a suitable RS485 120 ohm screened twisted pair cable.

  • Page 7: Optional Fibre Optic Interface

    A budget loss calculation should be made for all installations. The following table gives the Launch power and receiver sensitivity of each of the fibre optic communication ports on the 7SR21 & 7SR22 relays when used with specific fibre optic types.
  • Page 8 7SR21 & 7SR22 Data Communications The following table can be used to record budget calculations: Launch power Fibre Type Loss (dB/km) dB/km Length Total fibre loss (CxD) No. of Splices Loss at each splice Total loss at splices (FxG) No. of connectors...
  • Page 9 7SR21 & 7SR22 Data Communications There are two optional ports, com3 and com4, and when fitted the associated settings are available in the Data Communication menu. To allow communication using either or both of these ports the relay settings must be changed, via the fascia, in accordance with the method of connection and master device.

  • Page 10: Figure 2-3 Communication To Multiple Devices Using Fibre-Optic Ring Network

    7SR21 & 7SR22 Data Communications Figure 2-3 Communication to Multiple Devices using Fibre-optic Ring Network Control System 7SG24 Master RS232 straight through cable 62.5/125µm fibre optic with ST connectors Computer or Control System USB or 9 pin male D connector...

  • Page 11: Optional Rear Rs485 + Irig-B Interface

    7SR21 & 7SR22 Data Communications 2.1.4 Optional Rear RS485 + IRIG-B Interface Figure 2-5 Additional (Optional) Rear RS485 + IRIG-B Connection to a PC 2.1.5 Optional Rear RS232 + IRIG-B Connection IRIG-B COM 3 USB or 9 pin male D connector...

  • Page 12: Section 3: Modems

    7SR21 & 7SR22 Data Communications Section 3: Modems The communications interface has been designed to allow data transfer via modems. However, IEC 60870-5-103 defines the data transfer protocol as an 11 bit format of 1 start, 1 stop, 8 data and even parity, which is a mode most commercial modems do not support.

  • Page 13: Figure 3-1 Communication To Device Using 7Sg24 And Modem

    7SR21 & 7SR22 Data Communications 7SG24 Figure 3-1 Communication to Device using 7SG24 and Modem ©2010 Siemens Protection Devices Limited Chapter 4 Page 13 of 15...

  • Page 14: Section 4: Configuration

    Reydisp software comms editor tool. The Comms Editor is provided to allow its users to configure the Communications Files Protocols in Reyrolle brand Relays manufactured by Siemens Protection Devices Limited (SPDL). The editor supports configuring DNP3, IEC60870-5-103 and MODBUS protocols.

  • Page 15: Section 5: Glossary

    7SR21 & 7SR22 Data Communications Section 5: Glossary Baud Rate Data transmission speed. The smallest measure of computer data. Bits Per Second (bps) Measurement of data transmission speed. Data Bits A number of bits containing the data. Sent after the start bit.

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