PARTIAL DISCHARGE MEASUREMENT ANALYSIS ON RING MAIN UNIT

electrical engineering

As per IEC Standard 62271-200 we carried out testing on ring main unit or disconnector cum earthing switch (AC metal-enclosed switchgear and controlgear), The measurement of partial discharges may be appropriate as a routine test to detect possible material and manufacturing defects especially if organic insulating materials are used therein and is recommended for fluid-filled compartments. PDs are thus localized electrical discharges within any insulation system as applied in electrical apparatus, components or systems. In general PDs are restricted to a part of the dielectric materials used, and thus only partially bridging the electrodes between which the voltage is applied. The insulation may consist of solid, liquid or gaseous materials, or any combination of these. The term ‘partial discharge’ includes a wide group of discharge phenomena: (i) internal discharges occurring in voids or cavities within solid or liquid dielectrics; (ii) surface discharges appearing at the boundary of different insulation materials; (iii) corona discharges occurring in gaseous dielectrics in the presence of inhomogeneous fields; (iv) continuous impact of discharges in solid dielectrics forming discharge channels (treeing).So to avoid the economical losses, and better life cycle of component or product in transmission system, SF6 Gas type ring main unit system having the DIN type of bushing and fuse holder (as an insulation) to protect the system in crucial condition and to withstand the High voltage stress, So to avoid the economical losses, and better life cycle of component or product in transmission system, Partial discharge is very important as an electrical aspects, so this paper deals with the partial discharge measurement effect on Ring main unit after power frequencies test; having protective parts of Fuse holder at cable end termination and Bushing

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