CAJ | 학술논문

三相断路器经过长期运行后出现短时的三相合闸不同期,这在现实中是不可避免的.由于三相变压器三角形侧绕组的存在,使其在三相不同期合闸过程中会经历多个暂态过程,从而可能在剩磁较小的情况下也会导致铁芯的严重饱和,使差动保护误动作.在三相组式变压器模型的基础上,分析了三相不同期合闸的物理过程,对变压器合闸过程中的磁链进行了计算,并分析了产生磁链最大值的合闸情况以及漏抗对磁链的影响,发现漏抗在涌流的分析中不能忽略.分析表明,在三相不同期合闸的影响下可能出现二次谐波含量远低于传统值的情况.
삼상단로기경과장기운행후출현단시적삼상합갑불동기,저재현실중시불가피면적.유우삼상변압기삼각형측요조적존재,사기재삼상불동기합갑과정중회경력다개잠태과정,종이가능재잉자교소적정황하야회도치철심적엄중포화,사차동보호오동작.재삼상조식변압기모형적기출상,분석료삼상불동기합갑적물리과정,대변압기합갑과정중적자련진행료계산,병분석료산생자련최대치적합갑정황이급루항대자련적영향,발현루항재용류적분석중불능홀략.분석표명,재삼상불동기합갑적영향하가능출현이차해파함량원저우전통치적정황.
After long-term operation, the occurrence of short-time non-synchronous closing of three phase circuit breaker is inevitable in practice. And because of the existence of delta windings, the three phase transformer will then experience a multi-transient process, which may lead to the high saturation of iron core even with low remanent magnetism, thus result in the mal-operation of differential protection. Based on modeling of a three-phase transformer, the physical process of three-phase non-synchronous closing is analyzed, the changes of flux in the closing of transformer is calculated, and the closing situations which result in the maximum flux is also analyzed, as well as the influence of leakage reactance on flux, which is found to be non-negligible in analysis of inrush. Analysis shows that the second harmonics could be far smaller than the traditional value in case of non-synchronous closing.