变压器零序过电流保护动作原因浅析  

The Cause of Transformer Zero Sequence Overcurrent Protection Act

作　　者：华静[1] 熊伟[1] 艾莉[1] 

机构地区：[1]红河学院工学院,云南蒙自661199

出　　处：《山西电子技术》2014年第3期18-18,21,共2页Shanxi Electronic Technology

摘　　要：在中性点直接接地的高压电网中,针对主变压器配置的两段零序过流保护在不同故障点时的动作情况,提出相应的对策措施:对于一般接地点,主变装设两段零序过电流保护,可满足要求;但当接地点发生在主变110 kV侧TA与隔离开关之间时,该两段保护不能满足要求,必须添加一个独立时限跳母联断路器,可为主变零序过流保护提供参考和借鉴。Aiming at the main transformer zero sequence overcurrent protection at two different points of failure in the neutral grounding of high voltage grid ,the article proposes the appropriate countermeasures .For general grounding point , the installation of two main transformer zero sequence overcurrent protection can meet the requirements; but when the ground occurs between the main transformer 110 kV side of TA and isolation switch , the two protection cannot meet the requirements , a separate time jump circuit breaker must be added , then it can provide reference for the main transformer zero sequence overcurrent protection .

关 键 词：主变 零序过流保护 接地点 

分 类 号：TM772[电气工程—电力系统及自动化]