浙江电力2024，Vol.43Issue(2)：40-48,9.DOI:10.19585/j.zjdl.202402005
基于超宽频电压监测的大型水电站雷击暂态过电压分析
Analysis of lightning transient voltage in large hydropower station based on ultra-wideband voltage monitoring
摘要
Abstract
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 tran-sient 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 hydro-power 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 detec-tion of equipment anomalies,providing timely warnings and ensuring the reliability of equipment operation and stable hydropower dispatch.关键词
超宽频电压检测/水电站出线/雷击/暂态电压/时频分析Key words
ultra-wideband voltage monitoring/outgoing line of hydropower station/lighting strike/transient volt-age/time-frequency analysis引用本文复制引用
庞理声,丁登伟,李星,戴明建,韦金国,陈泰瑜,郭海霞..基于超宽频电压监测的大型水电站雷击暂态过电压分析[J].浙江电力,2024,43(2):40-48,9.基金项目
国家自然科学基金项目(51977120) （51977120）
