10kV配网内外过电压在线监测系统及波形分析

THE INTERNAL AND EXTERNAL OVERVOLTAGES ON - LINE MONITORING SYSTEM FOR 10 KV DISTRIBUTION NETWORK AND THE WAVEFORM ANALYSES

在研制成功响应速度快、分压比准确的高压分压器以及采样速率可调的高速数据采集卡的基础上 ,过电压在线监测系统可通过计算机自动捕获电网中出现的内外过电压波形。该系统可实时判断过电压的有无 ,完整记录过电压发生前后的实际变化过程 ,并能缩放波形。根据现场采集到的部分过电压波形样本 ,结合运行记录 ,分析了过电压的类别和发生的原因。监测结果可为电力系统的事故分析。

THIS PAPER DESCRIBES AN OVERVOLTAGE ON LINE MONITORING SYSTEM, WHICH CAN CAPTURE ALL KINDS OF OVERVOLTAGES, INCLUDING INTERNAL OVERVOLTAGE AND EXTERNAL OVERVOLTAGE. IT IS DEVELOPED SUCCESSFULLY BASED ON THE SUCCESS OF PRECISE HIGH VOLTAGE DIVIDER AND HIGH SPEED DATA ACQUISITION CARD. NOT ONLY CAN THE MONITORING SYSTEM JUDGE THE EMERGENCE OF OVERVOLTAGE ON TIME, BUT ALSO CAPTURE THE WHOLE PROCESS OF OVERVOLTAGE AND ZOOM IN OR OUT THE CAPTURED WAVEFORMS. THE PAPER ANALYZES OVERVOLTAGE TYPE AND ITS FORMING CAUSES, ACCORDING TO RUNNING RECORDS. THE MONITORING RESULTS CAN BE UTILIZED FOR ACCIDENT ANALYSIS, ELECTRICAL GRID LAYOUT AND SECURITY GUARANTEE IN POWER SYSTEM.