摘要
针对空载合闸矿用隔爆型干式变压器产生励磁涌流而造成保护装置的误动作,提出一种利用电流的瞬时频率变化率来解决该问题的新方法。建立3.3 kV矿用隔爆型移动变压站供电系统各种运行情况下的仿真模型,对提取的电流信号进行希尔伯特黄变换得到电流瞬时频率,对瞬时频率进行微分,根据微分值的特点提出新型保护判据。结果表明该判据能正确识别励磁涌流,可兼顾保护速度与保护精度。
Based on malfunction caused by inrush current of switching in mine explosion-proof dry type transformer with no load,a new method to identify inrush current based on current instantaneous frequency change rate is put forward.The simulation model of 3.3 kV mine explosion-proof dry type transformer station power supply system under all kinds of conditions is established.Signal instantaneous frequency is obtained through Hilbert-Huang transform,and then differentiation of instantaneous frequency is got.A new protection judgment based on differentiation value is proposed.Result shows that this judgment can distinguish inrush current reliably.It gives consideration to protection speed and protection precision.
出处
《煤矿机械》
北大核心
2012年第5期256-258,共3页
Coal Mine Machinery
基金
山东科技大学研究生科技创新基金项目(YCA110213)
关键词
矿用隔爆型干式变压器
频率特性
希尔伯特黄变换
励磁涌流
mine explosion-proof dry type transformer
frequency characteristic
Hilbert-Huang transform
inrush current
