ECP COMPACT AND MICRO SUBSTATION COMMISSIONING PROCEDURE

Transcription

1 Network(s): Summary: ENGINEERING COMMISSIONING PROCEDURE ECP COMPACT AND MICRO SUBSTATION COMMISSIONING PROCEDURE EPN, LPN, SPN This procedure details the testing and commissioning procedures for compact and micro substations. Author: John Mason Approver: Paul Williams Date: 23/04/2018 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 version. Circulation UK Power Networks External Asset Management UK Power Networks Services Capital Programme Contractors Connections ICPs/IDNOs Health & Safety Meter Operators Legal G81 Website Network Operations Procurement Strategy & Regulation Technical Training THIS IS AN UNCONTROLLED DOCUMENT, THE READER MUST CONFIRM ITS VALIDITY BEFORE USE

2 Revision Record Version 3.0 Review Date 23/04/2023 Date 21/03/2018 Author John Mason Reason for update: Periodic review What has changed: Alfresco file paths updated Version 2.0 Review Date 31/03/2018 Date 01/05/2013 Author Stephen Tucker Reviewed for G81 website Version 1.0 Review Date Date 04/11/2011 Author Original Stephen Tucker / Sinéad Hogan UK Power Networks 2018 All rights reserved 2 of 7

3 Contents 1 Introduction Scope References Abbreviations and Definitions Equipment Inspection Tap Changer Checks Winding Insulation Resistance Earthing Energisation Asset Data Test Equipment Certification... 7 UK Power Networks 2018 All rights reserved 3 of 7

4 1 Introduction 1.1 This procedure details the testing and commissioning procedures for compact substations that shall be satisfied before the compact substation can be accepted as fit for service and energisation. 1.2 This procedure shall be carried out by the Commissioning Engineer or his appointed representative, who shall be an Authorised Person having appropriate training and experience. 1.3 This procedure shall be carried out in accordance with the requirements of the UK Power Networks Distribution Safety Rules. 1.4 This procedure shall be carried out having regard to the requirements and recommendations of the manufacturer. If conflict exists between the requirements of the manufacturer and those of UK Power Networks the matter shall be referred to Asset Management (or your UK Power Networks nominated contact). 1.5 This procedure assumes that the unit has been installed in accordance with the appropriate procedures and that the equipment is isolated from the network. 1.6 The results of all observations, tests, adjustments and all relevant remarks shall be recorded on the associated test form. 2 Scope 2.1 This procedure applies to all compact substations, previously known as micro substations, padmounts and mini substations. 2.2 This procedure is intended for use by UK Power Networks field staff, contractors and external connection providers. 3 References 3.1 This procedure should be read in conjunction with the following references: UK Power Networks Distribution Safety Rules. EOS Compact Substations 11kV and 6.6kV. Manufacturer's installation and operation instructions (available from Intranet > PPF > Engineering > Reference Library > Manufacturers > CG Power Systems). 3.2 This procedure should be used with the following procedures and test forms: ECP a Compact Substation Test Form. ECP Earthing Commissioning. ECP a Earthing Test Form. ECP Secondary Substation Energisation. UK Power Networks 2018 All rights reserved 4 of 7

5 4 Abbreviations and Definitions 4.1 The following abbreviations are used throughout this procedure. Term ART PPF Definition UK Power Networks Asset Registration Team Policies, s & Forms 5 Equipment 5.1 The following test equipment is required to carry out the tests detailed in this procedure: 1kV insulation resistance tester (Megger). 6 Inspection 6.1 Record the compact substation details on the test form. 6.2 Carry out a visual inspection of the compact substation as detailed below referring to the manufacturer s manual where appropriate. If possible the Commissioning Engineer shall rectify any non-conformances. However, all equipment defects shall be referred to Asset Management (or your UK Power Networks nominated contact). Check that the compact substation is undamaged and is correctly positioned on the plinth. Check that all external surface finishes are undamaged and any damaged paintwork has been repaired. Check that the earthing terminal(s) are securely connected directly to the substation earth electrodes and that the HV and LV earths are separated or combined as required. Check all earth straps are securely fitted. Check that there are no oil leaks. Check that the transformer oil level is satisfactory (if applicable). Check that all valves are securely closed. Check that the pressure relief device is not blocked and remove any packing if labelled adjacent to device. Check that the HV bushings are satisfactory. Check that the LV bushings are satisfactory. Check that the LV fuse arrangement is undamaged. Check that the HV bay-o-net fuses are pushed in fully (if applicable). Check the transformer ID labels are fitted (if applicable). UK Power Networks 2018 All rights reserved 5 of 7

6 7 Tap Changer Checks 7.1 Carry out the following tap changer checks referring to the manufacturer s manual where appropriate: Operate the tap changer through all positions while off-circuit. Set the desired tap position. Lock the tap changer only if it is not located in the HV cable box (200kVA and above). Tap changers located in the HV cable box (100kVA and less) can not be interfered with since the lock would interfere with the HV insulation. 7.2 Record the tap position on the test form. 8 Winding Insulation Resistance 8.1 Measure HV winding insulation resistance as follows: Connect the LV windings together and to earth via the neutral-earth link and substation earth. Connect a 1kV insulation tester between the transformer HV winding and earth. The insulation resistance should be greater than the values shown in the table below. The transformer should be discharged after the measurement. 8.2 Measure LV winding insulation resistance as follows: Connect the HV windings together and to earth via the substation earth. Connect a 1kV insulation tester between the transformer LV winding and earth. The insulation resistance should be greater than the values shown in the table below. The transformer should be discharged after the measurement. Replace the neutral-earth link if it has been removed previously. Ambient Oil Temperature ( C) Insulation Resistance (MΩ) Insulation Resistance with Secondary Auxiliary Wiring (e.g socket, ammeter, RCD etc) (MΩ) UK Power Networks 2018 All rights reserved 6 of 7

7 9 Earthing 9.1 The earthing shall be tested and commissioned in accordance with commissioning procedure ECP Energisation 10.1 Energisation including phasing checks shall be carried out in accordance with ECP Asset Data 11.1 Complete the asset data form and send it to the Asset Registration Team (ART). This can be done via the Intranet (Asset Management > Asset Information > Asset Registration) or through SAP ESS. Ensure that the form is sent to the correct ART department: 12 Test Equipment 12.1 Record the purpose, make, type and serial number of all test equipment used during commissioning on the test form. 13 Certification 13.1 When the commissioning has been satisfactorily completed, sign and date the test form. Place a copy of the test form on-site in a plastic wallet and in a secure location. UK Power Networks 2018 All rights reserved 7 of 7