庞理声,丁登伟,李星,戴明建,韦金国,陈泰瑜,郭海霞
PANG Lisheng,DING Dengwei,LI Xing,DAI Mingjian,WEI Jinguo,CHEN Taiyu,GUO Haixia

• 1:大唐观音岩水电开发有限公司
• 2:清华四川能源互联网研究院

摘要(Abstract)：

水电站出线遭受雷击时将产生严重的雷击侵入过电压，站内GIS（气体绝缘组合电器）隔离开关和断路器操作也将激发VFTO（特快速暂态过电压），严重威胁GIS及变压器设备的绝缘安全。为此，在水电站主变压器高压侧的GIS设备上增设超宽频暂态电压传感器，构建水电站暂态电压在线监测系统，完整记录水电站出线遭受雷击时的站内暂态响应过程。通过对暂态电压时域和频域特征分析发现：水电站出线遭受雷击接地故障时，断路器可能出现断口重燃；基于侵入水电站的雷击暂态电压波形可实现准确的故障单端定位，当线路雷击距离水电站10 km以内时，侵入水电站内部的暂态电压将威胁变压器绝缘。利用超宽频暂态电压监测系统可准确记录水电站内异常暂态事件，通过各测点暂态波形的时域和频域特征对比分析，可定位暂态激励源位置，有助于发现设备异常并及时预警，保障设备运行可靠性和水电稳定外送。
When lightning strikes the outgoing lines of a hydropower station, it induces severe overvoltages. Then, the operation of gas-insulated switchgear(GIS) and circuit breakers within the station also triggers very fast transient overvoltages(VFTO), posing a significant threat to the insulation safety of GIS and transformer equipment. To address this, an ultra-wideband transient voltage sensor is installed on the high-voltage side of the GIS equipment at the main transformer of the hydropower station. This establishes an online monitoring system for transient voltages, capturing the transient response process in the hydropower station during lightning strikes on its outgoing lines.Through the analysis of time domain and frequency domain characteristics of transient voltage, it is observed that when the outgoing lines of the hydropower station experience a lightning-induced ground fault, fracture reignition may occur in the circuit breaker. Based on the waveform of the lightning transient voltage infiltrating the hydropower station, accurate single-end fault location can be achieved. When the lightning strike on lines occurs within 10 km of the hydropower station, the transient voltage infiltrating the station poses a threat to transformer insulation. The ultra-wideband transient voltage monitoring system accurately records abnormal transient events within the hydropower station. Comparative analysis of the time domain and frequency domain characteristics of transient waveforms at various measurement points facilitates the localization of transient excitation sources. This aids in the early detection of equipment anomalies, providing timely warnings and ensuring the reliability of equipment operation and stable hydropower dispatch.

关键词(KeyWords)： 超宽频电压检测;水电站出线;雷击;暂态电压;时频分析
ultra-wideband voltage monitoring;outgoing line of hydropower station;lighting strike;transient voltage;time-frequency analysis

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目（51977120）

作者(Author): 庞理声,丁登伟,李星,戴明建,韦金国,陈泰瑜,郭海霞
PANG Lisheng,DING Dengwei,LI Xing,DAI Mingjian,WEI Jinguo,CHEN Taiyu,GUO Haixia

DOI: 10.19585/j.zjdl.202402005

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