并联电抗器运行异常分析及处理

Research on the Abnormality of Parallel Connective Reactor

50 0kV深圳站变低 35kV并联电抗器在运行过程中 ,时常发生在投运时过流保护动作及运行时周边围栏发热的异常情况。通过对电抗器进行建模分析发现 ,电抗器在合闸瞬间存在涌流现象 ,涌流值的大小随合闸角的变化而变化 ,最大值可以达到正常电流的近 2倍 ,从而导致按常规方法整定的过流保护动作。另外 ,在对电抗器周边磁场进行分析发现 ,时变的磁场穿过其周边导体围栏使其产生感应电流是周边围栏发热的直接原因。发现异常的原因后 ,提出了相应的措施 ,并在实际中加以实施。其结果表明 。

Two abnormal phenomenon often occur during the operation of 35 kV parallel connective reactor at 500 kV Shenzhen Substation,one is the malfunction of over current relay when the reactor puts into operation and the other is the overheat of its metal enclosure.The model based reactor analysis shows that,flow surge happens at the moment it closes,the value changes according to the closing angle and the maximum can be approximately trice of normal flow,which causes the faulty action of over current relay set normally.By studying the magnetic field surrounding the reactor,it is found that the changing magnetic field passing the metal enclosure directly overheats it.The corresponding measures are given to solve these problems and the results show that they are effective.