Effect of Repetitive Impulsive Voltage Duty Cycle on Partial Discharge Features and Insulation Endurance of Enameled Wires for Inverter-fed Low Voltage Machines
Effect of Repetitive Impulsive Voltage Duty Cycle on Partial Discharge Features and Insulation Endurance of Enameled Wires for Inverter-fed Low Voltage Machines
复制标题
重复脉冲电压占空比对逆变低压电机漆包线局部放电特性和绝缘耐久性的影响
DOI：
10.1109/tdei.2017.006268
复制
发表时间：
2017-08-01
影响因子：
3.1
通讯作者：
Cavallini, Andrea
中科院分区：
文献类型：
--
作者：
Wang, Peng;Xu, Hongying;Cavallini, Andrea
针对电压型变频器供电的旋转电机，了解冲击电压参数对局部放电特性的影响，对于选择合适的冲击电压进行局部放电起始电压测量具有重要意义。类似地，绝缘耐久性对电压参数的依赖性可能有助于开发提供更准确的绝缘性能评估的资格测试。通过对单触点交叉漆包线在双极性重复冲击波电压下的大量试验，研究了电压占空比对变频电机绝缘局部放电特性和耐久性的影响。局部放电模式，幅度，重复率表明，短的脉冲电压持续时间（即小占空比），可以诱导不对称的PD模式，并减少PD开始在脉冲电压的下降沿的概率。此外，耐久性测试表明，重复方波电压的占空比可以显着影响绝缘耐久性。具有小占空比的重复方波电压往往会高估耐久性。因此，在对变频电机进行局部放电起始电压和绝缘耐久试验时，应认真考虑占空比的影响。
Dealing with electrical rotating machines fed by voltage converters, understanding the effect of impulsive voltage parameters on partial discharge features is of great importance to select appropriate impulsive voltage to perform partial discharge inception voltage measurements. Similarly, the dependence of insulation endurance on voltage parameters might help to develop qualification tests providing more accurate evaluation of insulation performance. The effect of voltage duty cycle on partial discharge characteristics and endurance of inverter-fed motor insulation were investigated through a large number of tests performed on single-contact crossed enameled wires under bipolar repetitive impulse wave voltages. The partial discharge pattern, magnitude, repetition rate show that short impulsive voltage duration (i.e. small duty cycles), can induce asymmetric PD patterns and reduce the probability of PD inception at the falling flanks of impulsive voltages. Moreover, the endurance tests indicate that the duty cycle of the repetitive square wave voltage can affect the insulation endurance significantly. Repetitive square wave voltages with small duty cycles tend to overestimate endurance. Accordingly, when performing partial discharge inception voltage and endurance tests on insulation of inverter-fed motors, the influence of duty cycle should be carefully considered.