康 兵,侯铁信,舒乃秋.高压电能表中电容分压器稳定性试验分析[J].电测与仪表,2015,52(23):. KANG Bing,HOU Tiexin,SHU Naiqiu.Stability Test Analysis on Capacitive Voltage Dividers insidethe High-voltage Watt-hour Meter[J].Electrical Measurement & Instrumentation,2015,52(23):.
高压电能表中电容分压器稳定性试验分析
Stability Test Analysis on Capacitive Voltage Dividers insidethe High-voltage Watt-hour Meter
To solve the poor stability of capacitive voltage dividers inside the high-voltage watt-hour meter, this paper presents a kind of dry-type capacitive voltage divider with a multi-level series structure. The 7000 hours voltage accelerated aging test, temperature test and power source test were taken for this kind of capacitive voltage divider. The test results demonstrate that the capacitance of voltage-dividing capacitors is attenuating with test time, and the dispersion of the attenuation is large. The capacitance attenuates fast at the beginning of test, afterwards gradually slows down, and the capacitance attenuation data can be fitted by a Gaussian function well. Thus it is possible to improve the stability of capacitive voltage dividers by either voltage accelerated aging for a certain time or screening capacitors with small dispersion. In addition, the temperature coefficient is too small to affect the accuracy of a CVD, which is within the allowable range of metering accuracy; and capacitive voltage divider for power source is able to provide stable output power which can meet the power consumption requirement of electronic circuits floated at high potential inside the high-voltage watt-hour meter. The test results provides technical support for the high-voltage watt-hour meter to work stably and reliably.
