In this paper, a newly developed generator partial discharge (PD) exper monitoring system is presented. The system consists, of four major modules, including system control module, system menu module, signal processing module and result display module. The system is based on expert system technique. Operators can process PD on-line monitoring more easily and automatically. Some field PD on-line monitoring results are also given and discussed in this paper.

The insulation on-line monitoring and fault diagnosis for high voltage power equipments is one of the most important techniques to maintain the reliability of power system. Since 1990s, the insulation on-line monitoring and fault diagnosis techniques have been greatly developed in China. Many universities, companies and research institutes have made great effort in this field. In this paper, the progress in China with the respects to partial discharge (PD) detection methods, on-line calibration, interference suppression, and fault diagnosis are reviewed.

The on-line monitoring of partial discharge (PD) in HV equipment is one of the most important insulation diagnostie techniques. In this paper, a new PD on-line monitoring system is presented. Broadband current transducer. Monitoring system with diagnostic software. and practical interference suppression techniques are descibed. The application of PD pattern recognition by using artificail neural network is also discussed at the end of this paper.

The Pulse Width Modulation (PWM) inverter plays an important role in express locomotive. Especially after traction motors are fed by fast switching inverters, the interturn insulation is destroyed more heavily. However, a new type of polyimide corona resistant film is developed and used in insulation of traction motors. In order to investigate the service life of this kind of traction motor, the mechanism and characteristics of dielectric breakdown of polyimide corona resistant are studied in the paper. Experiments have been carried out on specimen according to the condition of traction motor. The breakdown point of tested sample film is analyzed through energy spectrum analysis and electron microscopic photograph. At last, it is presented that the characteristics and mechanism of breakdown of polyimide corona resistance film.