Partial Discharge Online Monitoring for Hydro-generator

Abstract

The use of partial discharge (PD) online monitoring as an indicator of hydro-generator stator insulation condition, is well known. In this paper, a set of partial discharge online monitoring system for hydrogenerator (HPDMS) with the characteristics of high reliability is developed ， and the de-noise method of the system is introduced, In succession, the influence of PD sensors installation on hydro-generator's single phase grounding fault is investigated. The system has successfully checked out a stator insulation failure, the partial discharge trends when the stator winding is in failure are shown and the reason of the failure is explained, the actual failure of the stator winding is consistent with the analysis result, which greatly increases the credibility of the PD online monitoring technology.

Online UHF PD Monitoring for Step-up Transformers of Hydropower Plant

“…An on-site pulses knowledge base was established, and the method based on synthetic characteristics extraction in time and frequency domain which was introduced in [7]was adpoted for pulses recognition in this system. On this basis, in the processing of online PD monitoring, the operating condition of the hydro-generator and step-up transformer is combined to real-time indentify the pulses and determine the pulses type .…”