直流断路器分断试验等效评价标准及其考核方案

直流断路器作为新型电力装备,目前国际上尚无相关的试验标准,其等效分断试验方法有待深入研究.相较于交流系统故障电流存在自然过零点,直流断路器实现直流故障电流分断的关键在于通过自身不同支路间的换流过程,建立起大于直流系统电压的暂态开断电压来抑制故障电流.然而,现有分断试验对于暂态开断电压建立阶段关键部件电压相关应力考核尚属...

Equivalent Evaluation Standard and Scheme Design for Breaking Test of Hybrid HVDC Circuit Breaker

As a new type of power equipment,there is no relevant test standard for DC circuit breaker currently.Equivalent breaking test scheme needs to be further studied.Compared with AC circuit breaker breaking progress with alternating zero current point,the DC circuit breaker needs to establish transient interruption voltage by the commutation process between different branches,which is higher than the DC system voltage to suppress the fault current.However,voltage-related stress of key components is neglected in existing breaking test in the transient interruption voltage establishment.Firstly,the electrical stress of each key component in the transient interruption voltage establishment was analyzed in this paper.A more detailed and comprehensive evaluation standard for the breaking test of DC circuit breaker was proposed.Then,according to the equivalent parameter k,was proposed in this paper.The test circuit parameter design scheme was carried out by theoretical calculation and simulation analysis.Finally,the experiment was carried out for the 50kV breaker unit,and the experimental result was in line with simulation expectation.As above,value of this paper mainly fills the gap that key electrical stress during transient interruption voltage establishment is neglected in existing DC circuit breaker breaking test.The parameter design scheme of the breaking test circuit provides an economical and feasible solution for the"100%"recurrence of the proposed key stress.