燃气轮发电机20 Hz注入式定子接地保护灵敏度分析

20 Hz注入式定子接地保护与发电机绕组的接地故障位置无关,能够反映定子绕组绝缘的均匀下降,能够对绝缘老化起到监督作用。一般来说,与基波+3次谐波原理的定子接地保护相比,20 Hz注入式定子接地保护有灵敏度高、整定简单、调试方便等特点。但是同时也应该注意到,20 Hz注入式定子接地保护的灵敏度与发电机中性点接地设备的参数密切相关,中性点等一次设备的参数若配置不当,反而会降低20 Hz注入式定子接地保护的灵敏度,从而直接影响注入式定子接地保护功能的发挥,留下安全隐患。

Sensitivity Analysis of Ground Fault Protection of 20 Hz Injection Stator for Gas Turbine Generator

Ground fault protection of the 20 Hz injection stator has nothing to do with the location of geuerator winding earth fault, which can reflect the uniform decline of stator winding insulation, and monitor the aging of insulation. Generally, compared to the stator ground fat, h protection of fumtamental ＆ 3 harmonic principle, the 20 Hz injection stator grnund fault protection has the charaeteristics of high sensitivity, simply setting, convenient debugging, etc.. Meanwhile it should be noted that sensitivity of the 20 Hz injection stator ground fault protection is closely related to the parameters of neutral grounding device, ff the parameters of neutral grounding device are improperly configurated, the sensitivity of the 20 Hz injection stator ground fault protection may be weakened, directly affecting its function with potential risk of failures.