35kV电容式电压互感器一次熔断器异常熔断原因的试验研究

The Test Study on Abnormal Fusing of the Primary Fuse for 35 kV Capacitor Voltage Transformer

运行于35 kV系统的电容式电压互感器,在系统的一些操作过程中经常发生一次熔断器的异常熔断。试验结果表明,系统操作过程中,电容式电压互感器的电压发生急剧变化,由线性电容、线性电感及非线性电感构成的LC电路在过渡过程中,产生了幅值和频率较高的冲击电流,电流热效应的累积是造成一次熔断器熔断的根本原因。通过选用较高额定电流的熔断器,可降低电容式电压互感器一次熔断器异常熔断的发生概率。

The capacitor vohage transformer, operated in 35 kV system, often appears abnormal some system operating process. The test results show that in the process of the system operation, voltage transformer rapidly changes. During transient process, the LC circuit, consisted of linear and nonlinear inductance, produces the impulse the current thermal effect, leads primary fuse current with higher amplitude and frequency, as fusing. Through choosing higher rated current happening probability of the primary fuse can be reduced. According to the characteristic of the and the selecting principle of the capacitor voltage transformer fuse, cancel the primary fuse transformer is reasonable. fuse of primary fuse during the voltage of the capacitor capacitor, linear inductance well as the accumulation of fuse, the abnormal fusing capacitor voltage transformer for 35 kV capacitor voltage