Transcription of SPECIFICATION FOR 220 kV STATION CLASS SURGE …
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SPECIFICATION FOR 220 kV STATION CLASS SURGE …
_____ 220kV Page 1 of 8 SPECIFICATION FOR 220 kV STATION CLASS SURGE ARRESTERS A. system information A-1 system conditions The networks are mainly of outdoor type. The basic parameters are set out below: Nominal system voltage between phases kV 220 Earthing of neutral at transformers Solid system earthing Effectively earthed system Frequency Hz 50 system highest voltage kV 245 Symmetrical short circuit current at rated voltage RMS (ultimate) kA 25/40 Impulse withstand voltage Main Transformer kV 950 Impulse withstand voltage Other Equipment kV 1050 Power frequency voltage (1 min.)- Main Transformer kV 395 Power frequency voltage (1 min.)- Other Equipment kV 460 A-2 Minimum Substation Clearances Air insulated outdoor and indoor busbars and connections shall have electrical clearances as listed in the following table: - Highest system voltages between phases kV 245 Minimum clearance between live metal and earth mm 2200 Minimum clearance between live metal of different phases mm 2200 Minimum safety clearance between the nearest point not at earth potential of an insulator to ground (Pedestrian Access) mm 2300 Minimum safety clea
220kV L.A. Page 1 of 8 SPECIFICATION FOR 220 kV STATION CLASS SURGE ARRESTERS A. SYSTEM INFORMATION A-1 System Conditions The networks are mainly of outdoor type.
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