变电站地电位升测试系统的研发及其应用

为研究变电站接地短路或雷击故障造成的地电位升高及对二次设备造成的电磁骚扰,需要对变电站瞬态地电位升和二次设备电缆端口骚扰电压进行测量。根据变电站的测量环境与需求,设计和开发了一套具有高分压比、宽频带,适用于变电站现场复杂电磁环境的变电站地电位升测试系统。测试系统的硬件包括电磁屏蔽箱、独立电源模块、信号采集系统和光纤通信模块。基于Labview开发了测试系统和上位机的数据交互软件,实现了骚扰电压的自动测量和存储。经过专业机构性能检测表明,测试系统的电磁兼容性和测量功能均满足变电站现场使用要求,并在某220 k V变电站现场试验中获得了浪涌电压作用下接地网地电位升和电缆端口骚扰电压波形,证明了测试系统的有效性。

Development and application of ground potential rise test system for substations

In order to study the ground potential rise of substations and the electromagnetic disturbance on secondary equipment induced by the system grounding short circuit or lightning faults , it is necessary to measure the transient po-tential of the substation grounding grid and the harassment voltage of the secondary equipment cable port .Therefore , based on the measuring conditions and requirements in substations , a ground potential rise test system with high volt-age division ration and a wide frequency band is developed to apply to the complex electromagnetic environment of them.The hardware of the test system includes electromagnetic shielding box , independent power module , signal ac-quisition system and optical fiber communication module .Software is developed for the data communication between the test system and the upper computer based on Labview , to realize the automatic measurement and storage of the dis-turbance voltage .The professional performance test shows that the test system is suitable for the substation site test re -quirements in electromagnetic compatibility and measurement functions , and is capable to obtain the ground potential rise and harassment voltage waveform of the cable port in a 220 kV substation field test excited by a surge voltage , proving the effectiveness of the test system .