摘要
为了提高CVT测量的准确性,笔者通过理论分析分别给出了不同额定电容及不同节数的CVT测量准确度受污秽电阻影响的误差公式,并通过ATP软件对各种情况进行了一系列仿真,发现当CVT瓷套表面污秽电阻小于5 MΩ时其测量准确度会受到影响。对220 kV的CVT进行的人工污秽试验结果同样显示出:在重污秽地区使用CVT测量电压时,污秽电阻可能会影响到其测量的准确级。为保证准确测量,应定期清洁电容式电压互感器。
To improve measurement accuracy of capacitor voltage transformer, a formula to calculate the error due to the effect of contamination resistance on accuracy of CVT with different rated capacitances and different sections is presented. A series of simulations under different conditions are conducted via ATP software, and the results show that when the rated capacitance of a CVT is 0.01 μF and the contamination resistance on ceramic bushing surface is smaller than 5 MΩ, the measurement accuracy of CVT will be reduced. The artificial contamination experiment of a 220 kV CVT also indicates that contamination resistance may affect the voltage measurement accuracy in serious contamination area. Therefore, CVT needs regular cleaning to ensure its measurement accuracv.
出处
《高压电器》
CAS
CSCD
北大核心
2009年第2期62-65,69,共5页
High Voltage Apparatus
关键词
电容式电压互感器
污秽电阻
电压测量
测量精度
capacitor voltage transformer（CVT）
contamination resistance
voltage measurement
measurement accuracy
