HPC-9DJ

Transcription

1 Guideline General Application of Switching Devices on Distribution Networks Standard Number: HPC-2AA

2 Document Control Author Name: Anthony Seneviratne Position: Senior Standards Engineer Document Owner (May also be the Process Owner) Name: Justin Murphy Position: Manager Asset & Works Approved By * Name: Justin Murphy Position: Manager Asset & Works Date Created/Last Updated November 2013 Review Frequency ** 5 yearly Next Review Date ** November 2018 * Shall be the Process Owner and is the person assigned authority and responsibility for managing the whole process, end-to-end, which may extend across more than one division and/or functions, in order to deliver agreed business results. ** Frequency period is dependent upon circumstances maximum is 5 years from last issue, review, or revision whichever is the latest. If left blank, the default shall be 1 year unless otherwise specified. Revision Control Revision Date Description 0 22/11/2013 Original Issue STAKEHOLDERS The following positions shall be consulted if an update or review is required: Manager Assets and Works Manager Engineering Services Manager Engineering Systems Planning NOTIFICATION LIST The following shall be notified if an update or review is required: Operations Engineering & Projects Procurement DM# Page 2 of 11 Print Date 4/05/2017

3 TABLE OF CONTENTS 1 PURPOSE SCOPE AND APPLICATION REFERENCED DOCUMENTS GLOSSARY OF TERMS METHODOLOGY General Location Load Management Network Management Black Start Requirements of Generators Restoration Conditions Ratings of Existing Line Equipment Operational Management Ease of Access Fault Isolation Ring Networks or Back Feeding Types of Switching Devices... 7 APPENDIX A REVISION INFORMATION... 8 APPENDIX B OVERHEAD TYPE SWITCHING DEVICES... 9 APPENDIX C GROUND-MOUNTED TYPE SWITCHING DEVICES DM# Page 3 of 11 Print Date 4/05/2017

4 1 PURPOSE This document provides guidance to designers for the application of suitable switching devices on distribution lines to better manage and operate the loading on Horizon Power s electrical supply networks. 2 SCOPE AND APPLICATION This document will help designers in determining suitable locations and types of switching devices applied to either the interconnected or non-interconnected system networks by considering: 1) Loading of feeders; 2) Rating of switching devices; 3) Types of switching devices; 4) Network Restoration requirements; and 5) Black Start capabilities of connected generators. This guideline could help when designing: augmentation and/or rearrangement of MV networks; new medium voltage (MV) networks for residential, industrial and commercial areas; and operational work associated with restoration of supply in both overhead and underground systems. This guideline should also be applied wherever network restoration works are required following major network incidents, e.g. cyclones, storms, floods, etc. where a network reconfiguration requirement has previously been identified within the applicable existing network. NOTE: Under these circumstances, network planning and design approvals for the works shall already have been carried out prior to the network incident. 3 REFERENCED DOCUMENTS Switchgear Instruction Manual - (DM ) DM# Page 4 of 11 Print Date 4/05/2017

5 4 GLOSSARY OF TERMS The following definitions/acronyms have been used: Table 1: - Abbreviations and Definitions Backbone Main supply line of either overhead or underground feeders Black Start MV Network incident NWIS Restoration: a) Hot b) Warm to cold Switching point URD 5 METHODOLOGY 5.1 General 5.2 Location A situation where supply to the network has to be started, i.e. the first generator to come on line. Medium Voltage >1000 volts AC; < volts AC A situation where extensive damage has occurred, particularly to an overhead network, e.g. cyclone, which requires extensive rebuilding. North West Interconnected System Following interruption or loss of connected electrical load, a) restoration within ten (10) minutes b) restoration that commences more than ten (10) minutes following the initial supply interruption Isolation point used in the operation of feeder or to manage loads Underground Residential Distribution It is recommended that the location and type of switching devices should be made in consultation with the local operating personnel who have general knowledge of the area, the operational requirements of the network and customers. Determination of the appropriate location of switching devices depends on: 1) Load management; 2) Network management; and 3) Operational management Load Management Determining the loads that can be managed on distribution networks shall take into account the loading capacity of the line equipment. Generally larger loads have individual switching devices. These can be considered for load management, depending upon ease of access. DM# Page 5 of 11 Print Date 4/05/2017

6 When designing distribution networks to manage the loads being switched, as a minimum: a) Each feeder shall be designed so as to separate the transformer loads and bulk supply points along the feeder into approximately three (3) equally loaded sections by means of switching points; b) Each switching point selected shall be capable of breaking and making the maximum load current drawn through it; and c) Each switching point (where possible) shall be capable of remote operation regardless of the availability of communications. NOTE: The URD Design Parameters ensures that no more than two (2) distribution substations are connected between each switching point Network Management The management of the network as a whole can also dictate the location of switching devices, this is especially important on non-interconnected systems than the NWIS Black Start Requirements of Generators Step load response capability of power station; and the kw rating, fuel type and dynamic response of the generator used in Black Start conditions Restoration Conditions Length of time between initial interruption and restoration (i.e. hot or cold restoration); and Load type to be restored (residential, commercial, industrial, etc.) Ratings of Existing Line Equipment Capacity of existing line equipment to make (close) and break (open) the connected loads, (e.g. connected transformers or other customer loads), during isolation, restoration and load transfers on the network Operational Management Switching devices strategically placed can improve the operation of the individual feeders Ease of Access Switching devices (especially manual types) located on lines near to roads or before entering restrictive areas (i.e. fenced-off, hilly or swampy land), allow operators to easily isolate the associated line Fault Isolation Switching devices located to allow sections of the lines to be either isolated or energised (i.e. radial tee-off s from the backbone of network feeders) during fault finding exercises Ring Networks or Back Feeding Switching devices located to allow manageable portions of load to be transferred to other lines or entire line loads. DM# Page 6 of 11 Print Date 4/05/2017

7 5.3 Types of Switching Devices Switching devices installed shall be capable for the use intended: 1) Load Management Load rating of 630 A Making rating of 12.5 ka Breaking rating of 630 A 2) Fault Finding Load rating of 630 A Making rating of 12.5 ka Breaking rating of 12.5 ka Appendix B lists overhead type switching devices whilst Appendix C lists underground types. DM# Page 7 of 11 Print Date 4/05/2017

8 APPENDIX A REVISION INFORMATION (Informative) Horizon Power has endeavoured to provide standards of the highest quality and would appreciate notification if any errors are found or even queries raised. Each Standard makes use of its own comment sheet which is maintained throughout the life of the standard, which lists all comments made by stakeholders regarding the standard. A comment sheet found in DM: can be used to record any errors or queries found in or pertaining to this standard, which can then be addressed whenever the standard gets reviewed. Date Rev No. Notes 03/11/ First Issue DM# Page 8 of 11 Print Date 4/05/2017

9 APPENDIX B OVERHEAD TYPE SWITCHING DEVICES Item Switchgear Type Capacity 1. Disconnects (should not be used as switching devices) Load Breaking Making 1.1 MVDO Fuse Rating Fault Fuse Rating 1.2 S & C Fault Tamer Fuse Rating Fault Fuse Rating 1.3 Stanger In Line Links 250 A 50 A 50 A 2. Air Break Switch (should not be used as switching devices) 2.1 ALM 400 A 10 A 10 A 2.2 Falcon 400 A 10 A 10 A 2.3 Falcon Ezybreak 400 A 20 A 20 A 3. Load Break Switch 3.1 Nulec RL 630 A 630 A 12.5 ka 4. Sectionaliser (should not be used as switching devices) 4.1 Haycolec Load Rating Fault Load Rating 5. Reclosers 5.1 McGraw Edison RV ACR 400 A Fault Fault 5.2 Nulec N24 & U A 12.5 ka 12.5 ka 5.3 Reyrolle OYT ** 150 A Fault Fault NOTE: Information obtained from Switchgear Installation Manual. ** - equipment is questionable and should be considered for urgent replacement. DM# Page 9 of 11 Print Date 4/05/2017

10 APPENDIX C GROUND-MOUNTED TYPE SWITCHING DEVICES Item Switchgear Type Capacity Load Breaking Making 1. Disconnects 1.1 Alstom FBA5 630 A 630 A 16 ka 1.2 Alstom FBX 630 A 630 A 16 ka 1.3 Alstom Fluokit M 630 A 630 A 31 ka 1.4 Felten & Guilleaume GA2K 630 A 630 A 16 ka 1.5 GEC DDFA ** 400 A Fault Fault 1.6 Hazemeyer Magnefix MD ** 250 A 250 A/Fuse 250 A/Fuse 1.7 Holec SVS 630 A 630 A 40 ka 1.8 Long & Crawford ** ETV3/2 200 A 200 A Fault 1.9 Long & Crawford T4GF3 630 A 630 A Fault 1.10 Long & Crawford GF Merlin Gerlin M6 Vercors 1.12 Nebb Brown Boveri RGB12 J4 J R3 200 A 630 A 400 A 630 A 200 A 630 A 400 A 630 A Fault 400 A/Fuse 400 A/Fuse Fault 400 A/Fuse 400 A/Fuse Fault 1.13 Schneider D A/Fuse 100 A/Fuse Fault 1.14 Schneider RM6 400/630 A 400/630 A 40 ka 1.15 Siemens 8CK2 400 A/Fuse 400 A/Fuse Fault 2. Breakers 2.1 Alstom HWX 2500 A 40 ka 40 ka DM# Page 10 of 11 Print Date 4/05/2017

11 Item Switchgear Type Capacity Load Breaking Making 2.2 J A 26 ka 26 ka 2.3 English Electric OLX ** 800 A 13.1 ka 13.1 ka 2.4 GEC Alstom SBV A 16 ka 16 ka 2.5 GEC D4XD 400 A Fault Fault 2.6 Nilsen JB422/OMI 1600 A Fault Fault 2.7 Nilsen GEC OLX 800 A Fault Fault 2.8 Reyrolle 2A9T 800 A Fault Fault 2.9 Reyrolle LMVP 2500 A Fault Fault 2.10 Schneider AD4 MC 2000 A Fault Fault 2.11 Schneider RM6 400/630 A 16 ka 40 ka 2.12 Westinghouse J A 26 ka 26 ka 2.13 Yorkshire YSF6 630 A Fault Fault NOTE: Information for obtained from Switchgear Installation Manual. ** - equipment is questionable and should be considered for urgent replacement. DM# Page 11 of 11 Print Date 4/05/2017