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NGTS 2.1 Page 22 Issue 2 May 1995 B4 SINGLE SWITCH STATIONS Current transformers for feeder protection and for feeder instrumentation purposes shall be installed in the line current transformer housings. Current transformers for system back-up protection shall be installed in the line current transformer housings and in the bushings or housings on the higher numbered side of the bus section circuit-breaker; the current transformer for system back-up protection shall also be used for circuit-breaker fail protection. Current transformers for bus section instrumentation purposes shall be installed in the bushing or housings on the lower numbered zone side of the bus section circuit-breaker. Current transformers for mesh corner protection shall be installed in the line current transformer housings, the HV bushing turrets of the associated transformer(s) and in the bushings or housings on both sides of the bus section circuit-breaker, the current transformer for a particular zone or protection being located on the side of the circuit-breaker remote from that zone.
APPENDIX C NGTS 2.1 Page 23 Issue 2 May 1995 NGC SUBSTATIONS AND THE ENVIRONMENT: EXTRACT FROM GUIDELINES ON SITING AND DESIGN C1 OVERALL SYSTEM OPTIONS AND SITE SELECTION In the development of system options including new substations, consideration must be given to environmental issues from the earliest stage to balance the technical benefits and capital cost requirements for new developments against the consequential environmental effects in order to keep their adverse impact to a reasonably practicable minimum. C2 LOCAL CONTEXT, LAND USE AND SITE PLANNING C2.1 The siting of substations, extensions and associated proposals should take advantage of the screening provided by land form and existing features and the potential use of site layout and levels to keep intrusion into surrounding areas to a reasonably practicable minimum. Notes: 1 A preliminary study should be undertaken to identify the extent of land required to meet both operational and environmental needs. 2 In some instances it may be possible to site a substation partially or fully enclosed by existing woodlands. 3 Topographical information should be obtained at an early stage. In some cases a geotechnical survey may be required. C2.2 The proposals should keep the visual, noise and other environmental effects to a reasonably practicable minimum. Notes: 1 Allow sufficient space for screening of views by mounding or planting. 2 Consider appropriate noise attention measures where necessary. 3 Use security measures which minimise visual intrusion from lighting. 4 Consider appropriate on site water pollution prevention measures. 5 Consider adjoining uses and the amenity of local inhabitants. C2.3 The land use effects of the proposal should be considered when planning the siting of substations or extensions. Notes: 1 Issues for consideration include potential sterilisation of nationally important land, eg Grade 1 agricultural land and sites of nationally scarce minerals. 2 Effects on land drainage.
Page 1 and 2: National Grid Substations Technical
Page 3 and 4: SUBSTATIONS FOREWORD NGTS 2.1 Page
Page 5 and 6: 3.1.5 Operational Access NGTS 2.1 P
Page 7 and 8: 3.1.12 Voltage Transformer Secondar
Page 9 and 10: Nominal System Voltage Safety Dista
Page 11 and 12: 3.3 Requirements for GIS Substation
Page 13 and 14: NGTS 2.1 Page 11 Issue 2 May 1995 L
Page 15 and 16: NGTS 2.1 Page 13 Issue 2 May 1995 T
Page 17 and 18: 5.3.2 Partial Discharge Tests (GIS)
Page 19 and 20: APPENDIX A CURRENT TRANSFORMER ACCO
Page 21 and 22: NGTS 2.1 Page 19 Issue 2 May 1995 A
Page 23: APPENDIX B NGTS 2.1 Page 21 Issue 2
Page 27: RECORD OF REVISION NGTS 2.1 This is

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