Siemens 7SG14 Duobias-M-200 Technical Manual
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Siemens 7SG14 Duobias-M-200 Technical Manual

Siemens 7SG14 Duobias-M-200 Technical Manual

Transformer protection
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7SG14 Duobias-M
Transformer Protection
Document Release History
This document is issue 2010/02. The list of revisions up to and including this issue is:
Pre release
2010/02
Document reformat due to rebrand
R1
Revision History Added.
05/10/2006
Reformatted to match other manual sections.
Software Revision History
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
7SG14 Duobias-M-200 Commissioning

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Summary of Contents for Siemens 7SG14 Duobias-M-200

  • 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

    Restricted Earth Fault 1.3.6 Overfluxing 1.3.7 Thermal Overload 1.3.8 Backup Over current and Earth Fault 1.3.9 Negative Phase Sequence Over current Primary Injection / On Load Tests 1.4.1 Differential Protection ©2010 Siemens Protection Devices Limited Chapter 7 Page 2 of 20...
  • Page 3 Table 15 - Operate Currents Check..........................19 Table 16 - Primary Injection Phase Difference Check ....................19 Table 17 - REF Primary Injection Tests........................19 Table 18 - Trip, Alarm and Indiction Test........................20 Table 19 - Communication...............................20 ©2010 Siemens Protection Devices Limited Chapter 7 Page 3 of 20...

  • Page 4: Introduction

    If the CT secondary rating is 5A the bias characteristic may be tested single phase to allow test set amplifiers to be paralleled. ©2010 Siemens Protection Devices Limited Chapter 7 Page 4 of 20...

  • Page 5: Insulation Resistance Test

    Generally, where a considerable amount of multi-core wiring is included, a reading of 2 to 3 mega-ohms is reasonable but higher readings should be expected. A reading of 1M ohm should not normally be considered satisfactory. ©2010 Siemens Protection Devices Limited Chapter 7 Page 5 of 20...

  • Page 6: Ref Protection - Ct And Secondary Wiring Resistance

    OPTIONS -> COMMUNICATIONS. Note this window displays the active port of the laptop And not the relay. Select “OK” when changes are complete. Set the address on Reydisp Evolution to be the same as the relay station address. ©2010 Siemens Protection Devices Limited Chapter 7 Page 6 of 20...

  • Page 7: Setting Via Relay Fascia Pushbutton

    W1 Sec’y Currents x I 1.00 1.00 1.00 to select the current measured by each of the inputs injected: - e.g. W2 Sec’y Currents x I 1.00 1.00 1.00 ©2010 Siemens Protection Devices Limited Chapter 7 Page 7 of 20...

  • Page 8: Checking The Bias Characteristic (87Bd)

    Some of the more common bias characteristics used are displayed in Section 2 of this manual. The Biased Differential may also be conveniently tested using an Omicron Test Unit. Please contact Siemens Protection Devices Ltd for an Omicron test object template (.occ) for the Duobias-M Biased Differential Test Characteristics.

  • Page 9: Checking The Differential Highset (87Hs)

    Use the LCD display to check that the LV input settings are as follows: LV Interposing CT Multiplier 1.00 LV Interposing CT Connection Yy0 ©2010 Siemens Protection Devices Limited Chapter 7 Page 9 of 20...

  • Page 10: Restricted Earth Fault (87Ref)

    The voltage required for operation should be calculated and tested. The pickup and operate time should be recorded for each stage used. 9.8 Thermal Overload (49) The thermal pickup and operating time should be checked. The thermal overload equations for calculating the operate time are: ©2010 Siemens Protection Devices Limited Chapter 7 Page 10 of 20...

  • Page 11: Over Current And Earth Fault (51, 51N, 50, 50N, 50G, 51G)

    It is important before carrying out any primary injection to ensure appropriate CTs are shorted to avoid operation of mesh corner or busbar type unit protection. If the injected primary current is large enough, the bus zones protection may trip out unnecessarily! ©2010 Siemens Protection Devices Limited Chapter 7 Page 11 of 20...

  • Page 12: Biased Differential Protection

    "OPERATE A, B, C" should be negligible for all three phases. ©2010 Siemens Protection Devices Limited Chapter 7 Page 12 of 20...

  • Page 13: Putting Into Service

    Ensure that all earth links, trip links and inter-trip links are in their normal operational positions. Operate the Cancel PUSH BUTTON Replace the cover. Site test sheet See following pages ©2010 Siemens Protection Devices Limited Chapter 7 Page 13 of 20...
  • Page 14 CUSTOMER CONTRACT NUMBER ______________________________ SIEMENS CONTRACT NUMBER ______________________________ SITE/CIRCUIT REF. ______________________________ RELAY SERIAL NUMBER ______________________________ RELAY MODEL DUOBIAS-M-2______ RELAY ARTICLE NUMBER ______________________________ Signatures and Date: Test Engineer Customers Representative ….……………………………. ……………………………….. ©2010 Siemens Protection Devices Limited Chapter 7 Page 14 of 20...

  • Page 15: Site Tests

    Status 22 (I/O 3) Status 23 (I/O 3) Status 24 (I/O 3) Status 25 (I/O 3) Status 26 (I/O 3) Status 27 (I/O 3) Table 2 - Status Inputs ©2010 Siemens Protection Devices Limited Chapter 7 Page 15 of 20...

  • Page 16: Output Relays

    1.00 xI Winding 5 Line Currents 1.00 xI W1 EF/REF 0.200 xI W2 EF/REF 0.200 xI W3 EF/REF 0.200 xI Voltage Input 1.00 xV Table 4 - Measurement Accuracy ©2010 Siemens Protection Devices Limited Chapter 7 Page 16 of 20...

  • Page 17: Biased Differential Characteristics

    W2 REF Resistor ohms W2 REF Current Setting W2 Voltage Setting volts W3 REF Resistor ohms W3 REF Current Setting W3 Voltage Setting volts Table 8 - Restricted Earth Fault ©2010 Siemens Protection Devices Limited Chapter 7 Page 17 of 20...

  • Page 18: Overfluxing

    1.3.9 Negative Phase Sequence Over current LEMENT ICKUP CTUAL ALCULATED PERATE CTUAL ESET ESET (S) A ETTING ICKUP PERATE (E.G. ULTIPLE ELAY PPLIED ECORDED (x PU) Table 13 - Negative Phase Sequence Over current ©2010 Siemens Protection Devices Limited Chapter 7 Page 18 of 20...

  • Page 19: Primary Injection / On Load Tests

    W1 Neutral CT Reversed (significant spill current) W2 Neutral CT Normal Polarity (no significant spill current) W2 Neutral Neutral CT Reverse (significant spill current) Table 17 - REF Primary Injection Tests ©2010 Siemens Protection Devices Limited Chapter 7 Page 19 of 20...
  • Page 20 Enter Password(NONE is entered if not used) Numeric Password Code _ _ _ _ _ _ _ _ _ _ _ _ Record Password Code Table 19 - Communication ©2010 Siemens Protection Devices Limited Chapter 7 Page 20 of 20...

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