电压互感器宽频特性的建模(英文)

MODELING OF WIDE FREQUENCY CHARACTERISTIC OF POTENTIAL TRANSFORMER

在变电站内,开关的操作将产生瞬态过电压。为了预测这种瞬态过电压在变电站内二次回路中产生的干扰电压,应该建立变电站内的电压互感器(PT)传输函数的宽频模型。该文介绍了一种改进的传输函数综合方法。当PT的传输特性被测量后,就可以利用该综合方法建立该PT的宽频传输模型。该方法简单有效,同时,它还可以用来建立电容式电压互感器(CCVT)的宽频传输模型。

In substations, Switching operation will give rise to transient overvoltage. For prediction of the interference voltage in the secondary circuits of a potential transformer caused by the transient overvoltage in substation maincircuit, the wide frequency model for the transfer function of the potential transformer (PT) should be constructed. In the paper, a modified transfer function synthesis method is presented. After measuring the transfer characteristic of the PT, the wide frequency model of the PT can be set up with the synthesis method. The method is simple and effective; it can be used to constructed the wide frequency models for the transfer function of the coupling capacitor voltage transformer (CCVT) as well.