CAJ | 학술논문

　　选择合适的均压电容值是多断口真空断路器开断能力的重要保证。针对126 kV模块化三断口真空断路器，根据电位分布计算结果，分析确定采用 U 型布置方式。采用有限元法计算了 U 型三断口真空断路器的分布电容参数，并通过工频分压特性试验验证了计算的准确性，根据静态分压比计算结果选择了合适的静态均压电容值。建立了双断口真空断路器动态仿真模型，仿真结果表明：动态均压设计应该考虑残余电荷(residual charge，RC)的影响，其影响程度与各断口RC参数的差异特性有关。根据暂态恢复电压分配比计算结果选择了合适的动态均压电容值。综合考虑静、动态均压要求和其他相关因素，三断口真空断路器均压电容值选取为1000 pF，并通过合成开断试验验证了均压的有效性。
　　선택합괄적균압전용치시다단구진공단로기개단능력적중요보증。침대126 kV모괴화삼단구진공단로기，근거전위분포계산결과，분석학정채용 U 형포치방식。채용유한원법계산료 U 형삼단구진공단로기적분포전용삼수，병통과공빈분압특성시험험증료계산적준학성，근거정태분압비계산결과선택료합괄적정태균압전용치。건립료쌍단구진공단로기동태방진모형，방진결과표명：동태균압설계응해고필잔여전하(residual charge，RC)적영향，기영향정도여각단구RC삼수적차이특성유관。근거잠태회복전압분배비계산결과선택료합괄적동태균압전용치。종합고필정、동태균압요구화기타상관인소，삼단구진공단로기균압전용치선취위1000 pF，병통과합성개단시험험증료균압적유효성。
Selecting the appropriate value of grading capacitors is an important guarantee for the breaking capacity of a multi-break vacuum circuit breaker. To construct a 126kV modular triple-break vacuum circuit breaker, the U-shaped arrangement was selected based on the calculation results of potential distribution. Then the distributed capacitance parameters of the U-shaped arrangement were calculated by using the finite element method and the results were verified by measured results of power frequency voltage distribution tests. The appropriate value of grading capacitors for static voltage sharing design was selected according to the calculation results of static voltage distribution ratios. A dynamic simulation model of the double-break vacuum circuit breaker was established. The simulation results indicate that the dynamic voltage sharing design should take the influence of the residual charge (RC) into account, and the influence is relevant to the differences of RC parameters among breaks. The appropriate value of grading capacitors for dynamic voltage sharing design was selected according to the calculation results of transient recovery voltage (TRV) distribution ratios. Considering the requirements of static and dynamic voltage sharing designs and other concerned factors, the appropriate value of grading capacitors for the U-shaped vacuum circuit breaker was decided to be 1000pF and the effectiveness was verified by synthetic breaking tests.