工频下双馈感应发电机转子绝缘系统局部放电的测试及分析方法

Measurement and Analysis Method of Partial Discharge for Rotor Insulation System of Doubly-fed Introduction Generator Under Power Frequency

为验证双馈感应发电机的高海拔运行适应性,利用工频局部放电试验平台对双馈感应发电机转子绝缘系统进行局部放电测试,基于正态分布统计分析局部放电起始电压,得到在高海拔工况下双馈感应发电机绝缘系统的应用限制条件。结果表明:利用正态分布的3σ原则可以评估现有绝缘系统在不同温度和海拔工况下的运行适应性,得到其可承受的外部电应力限值。

In order to verify the operation adaptability of doubly-fed induction generator at high altitude,the rotor insulation system of doubly-fed induction generator was conducted partial discharge tests by power frequency partial discharge test platform. The partial discharge inception voltage was analyzed statistically based on normal distribution, and the applied limitation conditions of insulation system of the doubly-fed induction generator at high altitude were obtained. The results show that the 3σ principle of normal distribution can be used to evaluate the operation adaptability of the existing insulation system under different temperature and altitude conditions, and its acceptable external electrical stress limit is obtained.