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EDS 05-2010 Main Substation Feeder and Ring Main Unit Protection

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EDS 05-2010 Main Substation Feeder and Ring Main Unit Protection Document Number: EDS 05-2010 Version: 4.0 Date: 02/12/2015 ENGINEERING DESIGN STANDARD EDS 05-2010 VALIDITY BEFORE USE BEFORE VALIDITY MAIN SUBSTATION FEEDER AND RING MAIN UNIT S PROTECTION SETTINGS (LPN) Network(s): LPN Summary: This standard describes the protection settings for main substation feeders and ring main units in the LPN area. Owner: Kevin Burt Date: 02/12/2015 ADER MUST CONFIRM IT CONFIRM MUST ADER Approved By: Barry Hatton Approved Date: 08/01/2015 This document forms part of the Company’s Integrated Business System and its requirements are mandatory throughout UK Power Networks. Departure from these requirements may only be taken with the written approval of the Director of Asset Management. If you have any queries about this document please contact the author or owner of the current issue. Applicable To UK Power Networks External All UK Power Networks G81 Website Asset Management Contractors RE THE DOCUMENT, LED Capital Programme ICPs/IDNOs Connections Meter Operators HSS&TT Network Operations UK Power Networks Services Other THIS IS AN UNCONTROL AN IS THIS Document Number: EDS 05-2010 Version: 4.0 Date: 02/12/2015 E Revision Record Version 4.0 Review Date 08/01/2019 Date 02/12/2015 Author Kevin Burt Why has the document been updated – Periodic review What has changed – No content changes Document transferred onto a new template and rules applied S VALIDITY BEFORE US BEFORE VALIDITY S Version 3.2 Review Date 09/11/2015 Date 04/09/2012 Author Lee Strachan Document reviewed for publishing on G81 website Version 3.1 Review Date 09/11/2015 Date 25/08/2011 Author Chris Anderson Reclassified from EI to EDS Version 3.0 Review Date 09/11/2015 Date 19/08/2010 Author David G Edwards IT CONFIRM MUST ADER Rebranded, reviewed and review date extended Version 2.0 Review Date Date 30/10/2006 Author David G Edwards TLF ratings and revised ACB protection settings added Tables (6A and 11A) Version 1.0 Review Date Date 07/04/2004 Author David G Edwards Original, based on Protection Standard Number E 7/6 P 6/1 revision 4. Original no. EI 05-0046 LED DOCUMENT, THE RE THE DOCUMENT, LED THIS IS AN UNCONTROL AN IS THIS © UK Power Networks 2016 All rights reserved 2 of 14 Document Number: EDS 05-2010 Version: 4.0 Date: 02/12/2015 E Contents 1 Introduction ............................................................................................................. 4 2 Scope ....................................................................................................................... 4 3 Glossary and Abbreviations ................................................................................... 4 4 Main Substation Feeder Settings ........................................................................... 4 5 Secondary Distribution Transformers ................................................................... 4 5.1 Transformer Overcurrent Protection .......................................................................... 4 US BEFORE VALIDITY S 5.2 Transformer Earth Fault Protection ............................................................................ 4 6 HV Supplies ............................................................................................................. 5 6.1 HV Supplies to the Customer’s HV Switchboard ........................................................ 5 6.1.1 Overcurrent Protection .............................................................................................. 5 6.1.2 Earth Fault Protection ................................................................................................ 5 Tables ADER MUST CONFIRM IT CONFIRM MUST ADER Table 1 – Main Substation Feeder Settings ........................................................................... 6 Table 2 – Ring Circuit Breaker and Service Circuit Breaker – Electromechanical .................. 6 Table 3 – Ring Circuit Breaker and Service Circuit Breaker – VIP 200/300 ........................... 7 Table 4 – SEPAM 1000 ......................................................................................................... 7 Table 5 – SEPAM 1000+. ...................................................................................................... 8 Table 6 – Overcurrent Protection of Distribution Transformers (Glass Barrel TLF Fuse Links) ................................................................................................................... 9 Table 7 – Overcurrent Protection of Distribution Transformers (Tagged TLF Fuse Links) ... 11 Table 8 – Settings for Merlin Gerin Masterpact ACB Control Unit STR58U (Glass Barrel TLF Fuse Links) ................................................................................................. 11 LED DOCUMENT, THE RE THE DOCUMENT, LED Table 9 – Masterpact ACB STR 58U - 1200/1600A ACB with MODULE 1600A (Glass Barrel TLF Fuse Links) ...................................................................................... 12 Table 10 – Masterpact ACB STR 58U – 2000A ACB with MODULE 2000A (Glass Barrel TLF Fuse Links) ............................................................................................. 12 Table 11 – 1600A and 2000A Module (Glass Barrel TLF Fuse Links) ................................. 12 Table 12 – Micrologic NW16/20 H1 – 1600/2000A Module (Glass Barrel TLF Fuse Links) . 13 Table 13 – Micrologic NW16/20 H1 – 1600/2000A Module (Tagged TLF) ........................... 13 Table 14 – Sensitive Earth Fault Settings ............................................................................ 13 Table 15 – Overcurrent Protection of HV Supplies (refer to Section 6.1.1) .......................... 14 Table 16 – Falcon Alpha RMU Overcurrent Trip Times Versus Fault Current...................... 14 UNCONTROL AN IS THIS © UK Power Networks 2016 All rights reserved 3 of 14 Document Number: EDS 05-2010 Version: 4.0 Date: 02/12/2015 E 1 Introduction This standard describes protection settings for main substation feeders and ring main units in the UK Power Networks (UKPN) LPN region. 2 Scope This standard only applies to the London Power Network (LPN) area. S VALIDITY BEFORE US BEFORE VALIDITY S 3 Glossary and Abbreviations Term Definition UK Power Networks UK Power Networks (Operations) Ltd consists of three electricity distribution networks: Eastern Power Networks plc (EPN). London Power Network plc (LPN). South Eastern Power Networks plc (SPN). 4 Main Substation Feeder Settings IT CONFIRM MUST ADER The overcurrent and earth fault settings shall be as listed in Table 1 unless otherwise agreed with UKPN Asset Management. 5 Secondary Distribution Transformers 5.1 Transformer Overcurrent Protection The rating of the time-limit fuse-links or the type of thermal protection modules for overcurrent protection of secondary distribution transformers applied at ring main units and their associated air circuit breakers shall be as listed in Table 6. 5.2 Transformer Earth Fault Protection RE THE DOCUMENT, LED Instantaneous sensitive earth fault protection with sensitivities as declared in Table 14 is inherent in the design of all but: The Falcon Alpha units (original Falcon units) where it is provided, when specified, via dedicated core balanced current transformers; and Switch fuses, where it is not good practice to provide it. It should be noted that such a provision is not normally present on transformer mounted Falcon Alpha units. THIS IS AN UNCONTROL AN IS THIS © UK Power Networks 2016 All rights reserved 4 of 14 Document Number: EDS 05-2010 Version: 4.0 Date: 02/12/2015 E 6 HV Supplies Where an HV supply is connected directly to the customer’s own transformer, of which the rating and winding arrangement and impedance are similar to the Company’s distribution transformers, then Section 5 of this document shall apply. For transformers not so identifiable, advice should be sought from UKPN Asset Management. Where relays are used to afford protection then the settings shall be as in Table 1, Table 2 and Table 3. If Microprocessor relays are used, reference should be made to UKPN Asset Management with full details of the proposed installation so that individual settings can be supplied. S VALIDITY BEFORE US BEFORE VALIDITY S 6.1 HV Supplies to the Customer’s HV Switchboard 6.1.1 Overcurrent Protection Discrimination with the customer’s own equipment, other than fuses for HV faults, is not feasible with ring main units protected by time fuse links. Discrimination with the customer’s equipment can be afforded by use of protective relays. Relays installed with characteristics based on the standard inverse BS 142 curve shall have settings as in Table 2. Relays supplied with adjustable complex curves, may need special treatment and shall be referred to UKPN Asset Management. In some cases the customer will not require discrimination with the service and thus it may be possible to use time fuses for overcurrent (and instantaneous protection for earth faults IT CONFIRM MUST ADER when applicable). The rating of the time fuse link and thermal modules for these cases shall be as listed in Table 15. Limited discrimination is possible with units protected by thermal protection modules, and Table 16 relates to Falcon Alpha overcurrent trip times to fault current as an application guide. In cases of doubt advice should be sought from UKPN Asset Management. Where Falcon Alpha units are used to provide such a supply then the module shall be as specified in Table 15. 6.1.2 Earth Fault Protection Earth fault protection can be provided by protection relays and for the standard inverse
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