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[Cites 0, Cited by 0] [Section 6(18)] [Section 6] [Entire Act]

State of Tamilnadu - Subsection

Section 6(18)(vii) in Tamil Nadu Electricity Grid Code, 2005

(vii)Over voltage protection: There shall be proper "Insulation Coordination" studies before implementing the over voltage protection scheme. All the operating equipments, lines and UG cables shall be protected against direct lightning strokes by the use of masts / ground wires. In respect of protection against system generated surges (switching surges) and indirect lightning strokes/ back flash-overs, co-coordinated protective gaps and Metal Oxide Arresters (Gapless Arresters) shall be provided. These protective gapless arresters shall be placed at the entry point of OH lines/Under Ground Cable, at the power/ substation (Line Entrance Arrestors) and at a location very close to Auto/Power Transformers and other protected equipments including shunt capacitor banks. Gapless surge diverters shall be provided at the interface of OH line - UG cable in a composite circuit and also its entry at the power station / substation. To the extent possible, the mixing up of gapped and gapless arresters shall be avoided. Gapless arresters should not be placed on the LV side of a Auto/Power Transformer, when a gapped surge diverter already exists on its HV side. When IIV lines (110 kV or 66 kV) are used for feeding lower voltage substations (33,22 and 11 kV) after its degradation, its insulation level should be brought down to the level required by the substations fed i.e derated HV lines should not be employed directly for feeding lower voltage substations.