Analysis of misoperation of rotor one-point grounding protection;

Mistaking signal problem occurring in capacitor bank with microcomputer protection is discussed.

Because of the interference, the frequency of power net is unstable and the frenquency drift appears, which results in the error, especially the triggering error.

In this paper,the problems of stability of weak power system as DC sys te m urgently shutdown,disturbing the running pole caused by idle pole closing no l oad convertor transformer and erroneous firing of convertor valves,which occur red in commissioning of Shengsi HVDC project with weak receiving terminal,are an alyzed and discussed.