发电机定子匝间短路保护方案的研究

STUDY ON PROTECTION SCHEME OF GENERATOR STATOR TURN TO TURN FAULT

文章分析了发电机内、外部发生各种类型的故障时，机端突变量负序电压和负序电流以及突变量正序电压和正序电流之间的相位关系，提出了一种利用突变量负序方向元件构成正方向元件、突变量正序方向元件构成反方向元件的保护方案。正反方向元件在动作速度和灵敏度上相互配合，使保护在发电机内部故障时具有高灵敏度，外部故障时具有很高的安全性。

This paper analyses the phase relation between fault component of generator terminal voltage and that of current when there are various faults inside or outside generator. A protection scheme is presented with its positive and inverse directional element respectively using negative and positive sequence fault component. The two directional elements are cooperated both in velocity and in sensitivity, so that the protection is sensitive to internal fault and stays secure to external fault.