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Winding deformation is one of the most common faults of power transformers. It may cause partial discharge, even leads to insulation breakdown. Winding deformation also may cause the decreasing of mechanical properties of winding. The study of high sensitive detection method has important significance for detecting minimal change of transformer winding. So authors propose utilizing the nanosecond...
Using ultra-high frequency (UHF) method, partial discharge (PD) signals are detected based on four typical physical models of defects in gas insulated substation (GIS). Unified and normalized Lorenz plots are created from three dimensional n-u- t maps of the sampled data. Corresponding mathematical models are established using a five-rank Gaussian functions, and the principles and methods of establishment...
There exist many limitations in the widely utilized AC method to melt ice. In this paper, it is proposed an technology which applies DC to melt ice. It also introduces the deicing power supply, takes the conductor LGJ-400 as an example to explain the harmonic wave and the harmonic suppression caused by deicing with DC, and expound its influence on the line waving about and the stress on the iron tower...
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