CAJ | 학술논문

电容式电压互感器（CVT）在我国变电站中广泛应用，并作为电容型高压设备介质损耗因数在线监测的电压参考信号。研究表明，电压参考信号相位误差对介质损耗因数测量结果造成影响。本文对电容式电压互感器附加误差进行分析，并通过试验得出电网频率及环境温度对CVT相位误差的影响量，结果表明，由于电网频率和环境温度引起的CVT相位误差变化量与电容型高压设备自身绝缘缺陷引起的介质损耗角变化量在同一个数量级，极容易引起电容型高压设备绝缘状态的误判。应开展CVT误差在线校准相关研究，为电容型高压设备介质损耗因数在线监测提供高精度参考电压。
전용식전압호감기（CVT）재아국변전참중엄범응용，병작위전용형고압설비개질손모인수재선감측적전압삼고신호。연구표명，전압삼고신호상위오차대개질손모인수측량결과조성영향。본문대전용식전압호감기부가오차진행분석，병통과시험득출전망빈솔급배경온도대CVT상위오차적영향량，결과표명，유우전망빈솔화배경온도인기적CVT상위오차변화량여전용형고압설비자신절연결함인기적개질손모각변화량재동일개수량급，겁용역인기전용형고압설비절연상태적오판。응개전CVT오차재선교준상관연구，위전용형고압설비개질손모인수재선감측제공고정도삼고전압。
Capacitor voltage transformer (CVT) has been widely used in electrical power system for its high dielectric strength and low cost, and is also used to supply voltage reference signal in on-line monitoring of dielectric loss factor for capacitive equipment. Research indicates that phase error of CVT can affect measurement results of dielectric loss. In this paper, the additional phase error of CVT is analyzed, and the influence quantity of CVT phase error caused by power system frequency and ambient temperature is tested. Results indicate that the influence quantity of additional phase error is of the same magnitude as the dielectric loss angle caused by insulation defect of capacitive high-voltage apparatus, therefore is easy to cause the misjudgment of capacitive high-voltage insulation status. Research on on-line calibration of CVT error should be done to improve the precision of reference signal voltage, which is helpful for on-line monitoring of dielectric loss factor for capacitive equipment.