摘要
为验证基于内置低压电容C3电容式试验互感器(Capacitor Voltage Transformer,CVT)测量电力系统过电压波形的分压方式,即低压电容C3与高压电容C1和中压电容C2进行串联分压作为低压臂输出,基于无锡日新厂500kV CVT进行设备改造,串入了自制大容量无感电容单元(54μF)C3,分别进行了模拟工频过电压试验、操作冲击试验和雷电冲击试验。对采集获取的C3两端输出的数字电压波形信号进行了时、频域分析,以及分压比稳定性验证。试验和数据分析结果表明,串接自制大容量无感电容C3两端输出的电压波形光滑平稳,基本无过冲和振荡,分压比与设计值的相对偏差小于1%,即该分压方式适合用于超高压电网系统单次过电压波形的测量。
To validate a novel voltage-divider based on the capacitive voltage transformer （CVT） to measure over-voltage waveshape for power system, an element C3in series connection with high-voltage capacitance Cland media-voltage capacitance C2 as the low voltage part of sensor （LVPS） is used. A CVT of 500kV level provided by Nissin Electric Wuxi CO. , LTD was modified within a element C3of 54~LF in series connection. Lots of tests with ac simu- lation overvoltage, switch impulse and lightning impulse are done respectively to the modified CVT. Voltage wave-shapes from the element C3with digital sampling are analyzed in both time and frequency domains, and the stabili-zation of the voltage division ratio is also verified. The results of tests and data analysis show that the voltage wave-shapes from the element C3 developed in series connection within CVT have a good characteristic with stable wave-shape parameters, no overshoot and oscillation, and the relative deviation is lower than 1%. It is feasible to be used in overvoltage waveshape measurements of power system with ultra-high voltage level.
出处
《电工电能新技术》
CSCD
北大核心
2013年第2期43-47,共5页
Advanced Technology of Electrical Engineering and Energy
基金
华东电网有限公司项目(20103305312C091)
