摘要
提出了利用不对称电桥的直流系统在线绝缘电阻检测方法。基于对地直流泄漏电流的检测来确定馈电支路的接地故障。分析了磁偏差调制直流电流检测传感器的工作原理。所设计的检测电路把敏感线圈电感的变化转换成振荡信号频率的变化,实现了对直流泄漏电流的精确检测,且交变振荡信号又能有效地消除敏感线圈中直流电流引起的剩磁现象。通过现场运行测试,实验结果表明所提出的检测方法是有效与可靠的。
The method of testing insulation resistance based on asymmetric electric resistance bridge for direct current （DC） distribution system is proposed. The earth point faults of direct current feed lines are localized with testing of leak current. The principle of measuring leak current based on magnetism zero state drift is analyzed. The oscillator circuit of detecting leak current is designed, with which the inductance of detection coil is converted to frequency of oscillatory signal, and the oscillatory signals are used to eliminate the residual magnetism in coil after removal of leak direct current. The testing equipment has been developed. The experimental results show that new methods of insulation detection and earth point fault location are very successful.
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
2005年第8期849-852,共4页
Chinese Journal of Scientific Instrument
关键词
直流系统
在线绝缘检测
磁偏差直流电流传感器
交流消磁技术
DC distribution system Online insulation detection DC detector based on magnetism zero-state drift Eliminating remanence with alternative signal
