DESIGN OF GROUNDING REACTOR
RAJU BASAK *
Department of Electrical Engineering, Jadavpur University, Kolkata-700032, India.
SOURISH SANYAL
Department of Electronics and Communication Engineering, Durgapur Institute of Advanced Technology and Management, Durgapur, India.
AMARNATH SANYAL
IEM-Trust, University of Engineering and Management, Salt Lake, Kolkata-700098, India.
*Author to whom correspondence should be addressed.
Abstract
Grounding reactors are protective devices used in power system. Solid grounding was the earlier practice. It gave rise to high current to earth on occurrence of a fault. Later developments were intended for reducing the fault current under sustained fault condition. The arc suppression coil, also called Peterson coil is a particular form of grounding reactor which forms a resonating circuit with the line capacitance on occurrence of a single-line-to-ground fault. The variable reactor is tuned for resonance. This equipment drastically reduces the fault current- even power may be catered for some time under the condition of fault from the healthy lines. Air-core dry-type reactors do not utilize an oil insulation system. They are friendly with the environment and there are no fire hazard concerns. Furthermore, air-core dry-type reactors are essentially maintenance-free. The paper presents the design methodology of such arc-suppression coils, leading towards optimization.
Keywords: Grounding, reactance;, arc-suppression, copper and iron loss, over-all cost.