凝露是导致中压开关设备异常放电,造成供电中断的重要诱因之一.为验证开关设备在凝露工况下的绝缘和抗腐蚀性能,GB/T 3906—2020和DL/T 593—2016分别给出了相应的试验程序、试验方法和判断准则,重点对二者的试验程序和试验方法的异同点进行了对比分析,计算了主要试验设备参数并对试验中的难点问题进行了剖析,可供相关试验技术人员参考.

气体绝缘开关设备(GIS)和气体绝缘输电线路(GIL)产品的出厂电气试验通常是在总装车间内进行的,根据某1100 kV GIS/GIL总装车间电气试验需求,设计了满足工频耐压试验、局放试验及冲击试验的专用工装.采用六氟化硫(SF6)气体绝缘试验变压器和冲击发生器降低了厂房高度,节约了厂房建设投资;为确定工频电源补偿容量,计算了计及试验工装后的负载电容电流,还利用ATP-EMTP评估了GIS/GIL工装电容、电阻和电感对雷电冲击试验波形参数的影响,可供相关的试验技术人员参考.

特高压交直流电气设备的运行可靠性一直是设备制造厂和用户关注的重点问题,开展电气设备的交直流长期带电试验对于提高设备可靠性意义重大.介绍了国内外著名试验研究机构长期带电试验站的功能定位、基本布局、主要试验设备参数、开展的试验和相关课题研究工作等内容,可供从事试验技术研究的工程技术人员参考.

地震带电综合环境试验可模拟设备真实突发工况,能考核设备在地震时的安全性和可靠性,验证设备的设计并发现特殊工况中可能出现的问题和缺陷.基于某大型地震试验台,搭建了 ±1100 kV直流电压互感器在地震带电综合环境试验中异常放电的仿真模型,分析了放电电流的峰值和频谱,研究了不同电容量试品对放电电流峰值的影响,并给出了地震台测控系统的抗干扰措施和建议.

因试验人员对GB 3906—2006、IEC 62271-200:2011等标准的理解和执行存在偏差,导致中压交流金属封闭开关设备在实际运行和试验中出现许多问题.研究了国内外相关标准,对中压开关设备绝缘试验中大气湿度修正、内外绝缘考核、雷电冲击试验程序及判据、观察窗和活门的试验、开关断口的纵绝缘试验等难点问题进行了深入剖析,并指出了实际试验中应当注意的问题,为从事高压试验检测的技术人员参考.

The reliability of ultra-high-voltage (UHV)alternating current (AC)switch-gear and bushing during its whole life cycle has always been a major concern of Power Grid Corporation and manufacturers. The study of long term live test is the key to ensure safe and stable operation of bulk power grid. In this paper, the layout of test field, the technical parameters of main test equipment, impedance calculation of the 1 100 kV/10 kA test loop and the design of auxiliary grounding grid are described in detail. As the gas-insulated switch-gear (GIS)enclosure of 1 100 kV/10 kA power current transformer (power CT)has no external circulating channel, a special copper bar grounding grid is designed to form a complete loop. Its active power consumption, terminal voltage are calculated and verified. Meanwhile, considering that the project is located in the middle thunderstorm region, this paper designs a lightning protection system, which improved the lightning protection level of the test equipment and test object.

The reliability of Ultra-high-voltage (UHV) Alternating Current (AC) switch-gear and bushing during its whole life cycle has always been a major concern of Power Grid Corporation and manufacturers. The study of long term live test is the key to ensure safe and stable operation of bulk power grid. In this paper, the technical parameters of main test equipment, impedance calculation of the 1100kV/I0kA test loop and the design of auxiliary grounding grid are described in detail. As the Gas-insulated Switch-gear (GIS) enclosure of 1100kV/I0kA Power Current Transformer (Power CT) has no external circulating channel, a special copper bar grounding grid is designed to form a complete loop. Its active power consumption, terminal voltage are calculated and verified. Meanwhile, shunt capacitor are installed at both ends of the Power CT to compensate the inductive reactive power of the test loop and reduce the section of the winding and power capacity requirement. The future work on the AC long term live test loop is also briefly discussed.

分析了 GIS中快速暂态过电压 VFTO 产生的原因及危害,阐述了 GIS 隔离开关开合母线充电电流试验回路、试验方法及标准要求.介绍了测量 VFTO波形的内置圆盘电极及高速数据测量系统,探讨了相关测量技术指标和要求,并针对试验中需要注意问题给出了建议.