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NGTS 2.1 Page 14 Issue 2 May 1995 faults evolving to include two or more phases. 4.3.4 Couplers for Partial Discharge Measurement Partial discharge couplers (the requirement for which is specified in Clause 3.3.15) shall be sensitive to all frequencies in the range 0.1 - 1.5 GHz and shall give an output signal suitable for a spectrum analyser. Couplers shall have a linear response in the frequency range 50 Hz - 300 MHZ and a capability to make D.C. 'trapped charge' measurements. 5 TEST REQUIREMENTS 5.1 Type Tests 5.1.1 Busbars, Connections & Connectors Electrical type tests shall be performed in accordance with IEC 694. Tests of mechanical performance shall be subject to agreement between the Supplier and NGC dependant on the application. 5.1.2 Pressurised Gas-Filled Enclosures These shall be tested, where applicable, in accordance with the following CENELEC Standards: EN 50-052 EN 50-064 BS EN 50-068 BS EN 50-069 5.1.3 Cast Resin Partitions Cast resin partitions (barriers) shall be tested in accordance with CENELEC Standard EN 50-089. 5.2 Routine Tests at Manufacturers Works 5.2.1 Pressurised Gas-Filled Enclosures These shall be tested in accordance with the following CENELEC Standards: EN 50-052 EN 50-064 BS EN 50-068 BS EN 50-069 5.2.2 Cast Resin Partitions Cast resin partitions (barriers) shall be tested in accordance with CENELEC Standard EN 50-089. 5.3 Routine Tests at Site 5.3.1 Current Carrying Conductors Where joints between current carrying conductors are made on site then the joint electrical resistance shall be measured and recorded.
5.3.2 Partial Discharge Tests (GIS) NGTS 2.1 Page 15 Issue 2 May 1995 Partial discharge activity shall be monitored throughout the site power-frequency high voltage tests of GIS equipment. Suppliers shall state the maximum acceptable partial discharge level during the site test at 1.1 U/B3. This measurement shall be made on reducing voltage following the power frequency withstand test. The partial discharge level at nominal voltage shall also be recorded.
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: NGTS 2.1 Page 13 Issue 2 May 1995 T
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 and 24: APPENDIX B NGTS 2.1 Page 21 Issue 2
Page 25 and 26: APPENDIX C NGTS 2.1 Page 23 Issue 2
Page 27: RECORD OF REVISION NGTS 2.1 This is

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