摘要
研究电容式电压互感器(CVT)的暂态过程。对故障时CVT电路采用叠加原理,通过理论分析和仿真计算,可从其输出中分解出CVT的暂态噪声,从而建立暂态噪声模型。暂态噪声由低频、高频和非周期三个分量组成,占主导地位的是低频分量,高频分量一般只在故障5ms内发生作用。可以利用这一特点来提高保护电压的测量精度:通过采用一低阻滤波器来滤去暂态噪声中的低频分量,或是采用补偿算法对CVT输出中由于暂态噪声造成的误差进行补偿。这对于提高高压保护的动作准确性和动作速度是非常有意义的。
This paper researchs on the transient process of CVT. By theoretic analysis and simulative computation, the model of transient noise is established. Transient noise is composed of three components, low-frequency, high-frequency and non-periodic components. Among them, the low-frequency element is dominant, the high-frequency element has its effects during 5ms after fault. In the part of conclusion, new research way is put forward to reduce the error of transient measuring.
出处
《继电器》
CSCD
北大核心
2003年第6期19-22,共4页
Relay
