Abstract
The high frequency transient recovery voltage caused by usually switching operation of the circuit breakers, used on shunt reactor switching, have become a noticeable problem recently. For extension the service life time and normal operation of the circuit breakers, a well modified maintenance strategy is proposed. The field testing and experimental measurement showed the maintenance strategy proposed had been proved effectively and adopted in Taiwan Power Company.
Highlights
The increasing leading reactive power caused by the underground power cables, used in transmission and distribution system from 11 kV to 345 kV, have become a noticeable problem and should be solved for voltage and reactive power flow control
The simplified circuit model of series RLC and circuit breaker used for switching analysis can be formulated as differential Equation (1), while the waveform of transient recovery voltage, TRV, between source side and load side contactor after circuit breaker opened can be calculated by solving the Equation (1) and expressed by Equation (2)
After series calculating statistically the arcing time and arcing energy of inductive load switching, field testing records excused in Taiwan, we proposed a maintenance strategy that the circuit breaker must be re-flashed after every 500 switching operations
Summary
The increasing leading reactive power caused by the underground power cables, used in transmission and distribution system from 11 kV to 345 kV, have become a noticeable problem and should be solved for voltage and reactive power flow control. The circuit breakers used for shunt reactors switching caused the unavoidable high frequency transient recovery voltage (TRV) during switching operation. The Electromagnetic Transient Program (EMTP) has been employed to simulate and analyze the transient phenomenon of gas-insulated circuit breaker (GCB) during shunt reactor switching. We got a lot’s of problems on gas-insulated circuit breaker for shunt reactor switching during the past few years in Taiwan power system. The highly rise rate of transient recovery voltage of inductive current switching caused re-striking phenomenon and incomplete tripping. These two main characteristics make GCB using for shunt reactor un-expectantly damaged
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