水轮发电机组状态在线监测系统运行维护与检修试验规程
变电设备在线监测系统技术导则
基于超宽频电压监测的大型水电站雷击暂态过电压分析
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 line
基于光电一体的GIS设备故障检测技术研究
特高频法对GIS/HGIS进行局部放电检测成为国内外局放检测领域研究的重点和热点,然而如今特高频检测技术遇到了瓶颈,主要是在线监测系统诊断结果的可靠性存在严重的问题,国内许多500kV及以上变电站都安装了特高频局放在线监测系统,运今为止,成功预警的次数很少,经常发出报警信息,虚警和漏警同时存在,严重扰乱了运维的工作秩序、降低了安装在线监测系统的必要性和价值。诊断结果的可靠性低,其本质是在超高压、特高压变电站存在请多的外部电磁干扰,目前特高频检测方法的免疫力还不够,既难以抑制,也难以判别。 光学检测方法由于检测的是发光现象,不受电磁环境干扰的影响,具有优良的抗干扰性能,另外,由于GIS/HGIS是全封闭的结构,在GIS/HGIS内部不存在千扰光源,能进一步提高光学检测结果的有效性,因而,从放电时会伴随发光现象的角度,采用光学方法检测GIS/HGIS内部的放电情况将会具有其它方法无法比拟的优势。 目前基于光电信息的监测系统已成功应用于欧洲、澳洲、亚洲多个变电站的GIS设备,取得了良好的效果,具有广泛应用前景,然而在国内变电站的应用中基本还处于空白。
燃煤锅炉一氧化碳在线监测系统技术规范
电力用阀控式铅酸蓄电池组在线监测系统技术条件