CAJ | 학술논문

为研究重复脉冲电压上升时间对变频电机绝缘的局部放电特征影响规律，基于超高频天线、检波技术和宽带、高速数据采集和传输技术设计了重复脉冲电压下变频电机绝缘局部放电检测系统。研究了变频电机匝间绝缘在不同上升时间重复脉冲电压下的局部放电统计特性并对其机理进行了分析。结果表明：在微秒级的上升时间下，脉冲电压极性快速翻转导致变频电机绝缘薄弱处空间电荷电场和外部电场叠加，易超过局部放电起始电压，从而产生次数较多的小幅值放电，且放电幅值随着上升时间的减小而增大，但单个周期放电总量逐渐减少。因此设计耦合传感器时应根据重复脉冲上升时间和局部放电脉冲频域能量分布特点，设计高频响应较好的传感器，避免脉冲电源干扰使测试灵敏度降低，从而得到准确反映电机绝缘水平的PDIV和RPDIV。
위연구중복맥충전압상승시간대변빈전궤절연적국부방전특정영향규률，기우초고빈천선、검파기술화관대、고속수거채집화전수기술설계료중복맥충전압하변빈전궤절연국부방전검측계통。연구료변빈전궤잡간절연재불동상승시간중복맥충전압하적국부방전통계특성병대기궤리진행료분석。결과표명：재미초급적상승시간하，맥충전압겁성쾌속번전도치변빈전궤절연박약처공간전하전장화외부전장첩가，역초과국부방전기시전압，종이산생차수교다적소폭치방전，차방전폭치수착상승시간적감소이증대，단단개주기방전총량축점감소。인차설계우합전감기시응근거중복맥충상승시간화국부방전맥충빈역능량분포특점，설계고빈향응교호적전감기，피면맥충전원간우사측시령민도강저，종이득도준학반영전궤절연수평적PDIV화RPDIV。
To study the effect of repetitive impulse voltage rise time on the partial discharge(PD) characteristics of inverter-fed motor insulation, we designed a PD detection system for inverter-fed motor insulation under repetitive impulse voltage based on ultra-high frequency antenna, detection technology and broadband, and high-speed data acquisition & transmission technology. The PD statistical characteristics of the interturn insulation of inverter-fed motor under different impulse voltage rise time were obtained by the system, and their mechanism was analyzed. The results show that when the voltage rise time is under μs level, the electric field of space charge of the weak insulation caused by the fast reversal of voltage polarity would superpose the external electric field, which would exceed the partial discharge inception voltage(PDIV) and produce many times of PD with low magnitude. The PD magni-tude increases with the decrease of the rise time, but the total discharge amount in one cycle decreases gradually. Therefore, the design of coupling sensor should base on the repetitive impulse voltage rise time and PD impulse voltage distribution characteristics to avoid the sensitivity decrease disturbed by the pulse voltage, thus the accurate PDIV and RPDIV of the inverted-fed motor were obtained.