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In this paper, some models of typical potential transformers (PT) were established by PSCAD/EMTDC considering the non-linear magnetic excitation characteristic. A test system for the experimental research in a 10kV neutral non-grounding distribution power grid was also set up. A series of simulating tests to reproduce ferroresonance initiated by single phase grounding or line breaking fault were carried...
This paper focuses on the effectiveness of anti-ferroresonance measures in distribution power grid. In order to simulate the reliability of commonly used anti-ferroresonance measures, a 10kV ferroresonance testing system was set up, and a series of experiments reproducing the ferroresonance initiated by single phase grounding fault or disconnection fault (usually accompanied by grounding) and so on...
The inter-turn insulation of stator winding for wind turbine generator (WTG) usually suffers the repetitive impulse over-voltages when the converter is connected to the winding terminals. The long-term effect of repetitive impulse over-voltages may lead to the development of inter-turn insulation defects and/or the occurrence of inter-turn insulation fault due to partial discharge (PD) activity. In...
In this paper, the corona inception voltages in air gap between the adjacent stator end-windings of increased safety high-voltage (HV) explosion-proof motor were measured, and the corresponding electric field were calculated basing on the established model. Under ac and impulse test voltages, the voltage (or stress gradient) distributions along a grading coating of stator end-winding were measured...
With the rapid increasing of the amount and capacity of wind power generation worldwide, the operation reliability of wind turbine generator (WTG) became more and more important due to its high repairing cost. In this paper, a procedure based on the accelerated multi-factor aging test was firstly established for evaluating the insulation system of offshore WTG. The specimens for modeling the stator...
The stator insulation system of offshore wind turbine generator (WTG) will be subjected to marine environment, such as high humility and heavy salt fog. In order to study its resistance to this hostile environment, the marine environmental conditions in the coast regions along China's coastline have been firstly examined in this paper. The specimens for modeling stator insulation system of 5MW/3kV...
The stator insulation of wind turbine generator (WTG) would be subject to the repeated pulse voltage, thermal, mechanical and other environmental stresses. In this paper, the methods of the accelerated multi-factor aging test and evaluation for WTG were established. Specimens for modeling stator insulation system were prepared. The multi-factor stresses containing the repeated pulse voltage, change...
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