一种新型配电网在线监测装置的研制

摘要

为解决配电网中传统的故障指示器无法准确识别小电流单相接地故障与定位问题,引入了基于暂态量零模的参数识别法,研制了一种应用于配电网的新型在线监测装置.三相探头通过自取电模块从线路电流中获取能量为其自身提供电源,利用罗氏线圈采集线路电流,采用非接触式电压传感测量线路电压,通过一种基于近距离无线通信的分布式同步录波方法实现故障波形的录制.通信终端汇总故障波形并对其进行零序矢量合成,自动完成对单相接地故障的识别与告警指示,为解决小电流单相接地故障定位和提升配网自动化覆盖率提供了一种新的解决方法.现场实验结果证明了该装置的实用性和对小电流单相接地故障检测与定位的准确性.%In order to solve the problem that the traditional fault indicator in distribution network can't distinguish and locate the single-phase grounding fault in small current system, a model identification method based on transient zero sequence network is introduced, and a new on-line monitoring device for distribution network is developed. The three-phase probes obtain energy from the line to provide power for their own use through its self power module, use Roche coil to acquire the circuit, and measure voltage by the non-contact sensors, and realize the recording of fault waveform through distributed synchronous recording method based on short distance wireless communication. The communication terminal summarizes the fault waveforms and makes zero sequence vector synthesis. It automatically completes the identification and alarm instruction for single-phase grounding fault, and provides a new solution to solve the problem of the single-phase grounding fault location and improve the coverage rate of distribution network automation. The field experiment results show the practicability of the device and the accuracy of the detection and location of the single phase grounding fault in small current system.