摘要
针对10 kV及35 kV干式空心电抗器匝间短路故障频发的问题,分析了直流电阻测量法、阻抗测量法和高频脉冲振荡电压检测法的原理。人工短路试验数据表明直流电阻测量法和阻抗测量法对一匝匝间短路等轻微的故障检测灵敏度不高。而高频脉冲振荡电压检测法的相关计算表明,匝间短路会引起线圈电阻值和电抗值发生较大变化。电抗器电压波形振荡频率增大,衰减速度加快,衰减周期减小。利用高频脉冲振荡法对空心电抗器的匝间绝缘进行试验,通过比较分析电压振荡波形,能有效检测匝间短路。最后通过大量的现场试验,成功发现了多起10 kV及35 kV干式空心电抗器匝间短路故障,验证了高频脉冲振荡电压法检测干式空心电抗器匝间短路故障的有效性。
Aiming at the frequent occurrence of turn to turn short circuit fault in 10 kV and 35 kV dry-type air-core reactor,the principles of DC resistance measurement method,impedance measurement method and high frequency pulse oscillation voltage detection method are analyzed.Artificial short circuit test data show that DC resistance measurement method and impedance measurement method are not sensitive to one turn to turn short circuit and other minor faults.The calculation of high frequency pulse oscillation voltage detection method shows that the turn to turn short circuit will cause the coil resistance and reactance to change greatly.The results show that the oscillation frequency of reactor voltage waveform increases,the attenuation speed increases and the attenuation period decreases.High frequency pulse oscillation method is used to test the turn to turn insulation of dry-type air-core reactor.By comparing and analyzing the voltage oscillation waveform,the turn to turn short circuit can be effectively detected.Finally,through a large number of field tests,a number of 10 kV and 35 kV dry-type air-core reactor inter turn short circuit faults are successfully found,which verifies the effectiveness and sensitivity of high frequency pulse oscillation voltage method in detecting dry-type air-core reactor inter turn short circuit faults.
作者
潘剑南
李浩良
PAN Jiannan;LI Haoliang(Guangzhou Yueneng Power Technology Development Co.,Ltd.,Guangzhou 510075,China)
出处
《湖南电力》
2021年第6期68-73,共6页
Hunan Electric Power
关键词
干式空心电抗器
匝间短路
高频脉冲振荡电压法
dry-type air-core reactor
turn to turn short circuit
high frequency pulse oscillation voltage method
