【摘要】 分析中性点经配电变压器接地的发电机当前正运行中的基波零序过流保护存在的问题,并以"发电机定子绕组任一点单相接地时只要接地点的接地电流大于安全允许电流保护都能动作"为原则提出了三种新保护方案,这三种方案的保护原理是相同的,只是保护端子的测量参数不同而已。新保护方案能显著提高大容量发电机基波零序过流或过压保护的性能,并能在定值上实现明确的两段式保护。更多还原

【Abstract】 This paper analyses the problems of zero-sequence fundamental over-current protection in current operating generator of distribution transformer for generator neutral grounding. It puts forward three kinds of new protection schemes with same protection principle but different measurement parameters of protection terminal, according to the principle of " If only the grounding current of the grounding point is more than the approved current, when any point grounding of the generator stators, the protection will act ". The new protection schemes will significantly increase the performance of zero-sequence fundamental over-current and over-voltage protection of large generator and achieve clear two segments protection by the setting value.更多还原