500kV电容式电压互感器电容值及介损值的现场测试

Filed Measurement of Capacity and Dielectric Loss on Site for the TEHMP-500 Type 500kV Capacitive Voltage Transformer

TEHMP-500型500kV电容式电压互感器(CVT)由于在中间变压器一次绕组首端位置设置了一把接地刀闸,在现场测试中,通过操作外部的操作把手合上接地刀闸,使中间变压器一次绕组首端接地,可以很方便地采用反接法测试C13及C2的电容值及介损,克服了采用自激法测试的弊端。

In the TEHMP-500 Type 500kV CTV, a grounding-switch is set in the front of the middle transformer primary turn. During measurement on site, the front of the middle transformer primary turns becomes on grounding through operating the outside handle to close the grounding-switch. Thus the capacitances of C13 and C2 and dielectric loss can be measured conveniently using inverse connecting method , the disadvantages of self-excitation method can be avoided.