CAJ | 학술논문

变电站直流系统的非金属性接地出现频繁、持续时间短、装置难以监测。结合以往排查经验，提出对变电站重点设备建立绝缘数据库，在直流系统发生故障时首先查找该数据库中的薄弱直流回路，再结合转移负荷法、拉路法等常规排查方法，实现直流系统非金属性接地故障的快速查找。并综合各种故障查找方法的优缺点，建立故障查找流程。最后通过实例实践证明该故障查找方法的有效性。
변전참직류계통적비금속성접지출현빈번、지속시간단、장치난이감측。결합이왕배사경험，제출대변전참중점설비건립절연수거고，재직류계통발생고장시수선사조해수거고중적박약직류회로，재결합전이부하법、랍로법등상규배사방법，실현직류계통비금속성접지고장적쾌속사조。병종합각충고장사조방법적우결점，건립고장사조류정。최후통과실례실천증명해고장사조방법적유효성。
In the substation DC supply system,the Non-metallic grounding fault occurs frequent-ly,which has short duration and is difficult to be detected.Based on previous investigation expe-rience,a quick non-metallic grounding faults detection method is proposed in this paper.In this method, the substation insulation database of key equipments DC supply was built.When grounding fault occurs,the weak insulation DC circuit was detected firstly in the database.Then by comprehensive utilization of the load transfer method,disconnect branch line method and oth-er conventional detection methods,the DC grounding fault can thus be detected quickly with high accurate.By comprehensive evaluation of various DC grounding fault detection methods,a more scientific and reasonable non-metallic DC system grounding faults detecting scheme was estab-lished.A case practices results proved that this method was highly effective.