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This paper focuses on the stray capacitance of HVDC key devices and its impact on the harmonic distribution and the problem of obtaining wide band models for electrical power system transient simulation purposes for EMTP with linear components. Smoothing reactor, converter transformer and the valve hall can be modeled with stray parameters by segmented wide-band model with skin effect resistance....
It is commonly known that the longer the distance between a surge protective device (SPD) and a protected device, the worse the protection effectiveness. However, we observed there exists a worst distance between an SPD and a protected device in a low-voltage circuit. If a protected device and an SPD are separated by this worst distance, the protected device will be subject to the most severe surge...
A special simulation model for the surge responses of ZnO varistors is introduced in this paper. This model is based on the Voronoi network and contains the actual conduction mechanism of the grain boundaries, as well as the capacitances of the grain boundaries. The surge responses of the actual varistor samples were simulated and compared with the experimental results. The simulated waveforms agree...
Since it has a great height, large volume and complicated configuration, the 1000-kV ultra-high voltage surge arrester has a very nonuniform potential distribution, which leads to the depressed service life and low safe reliability. This paper proposed the three-dimensional FEM and circuit analytic method to analyze and improve the potential distribution of the 1000-kV surge arrester. An optimal grading...
The metal oxide arrester (MOA) is key equipment in high voltage power system. If the potential exerted on a ZnO disc is very high, it is more easily destroyed than others. Compared with GIS MOAs for 750 kV and below, the 1000 kV GIS MOA has greater height, larger volume and multiple columns, which leads to a very nonuniform potential distribution and makes the method to analyze the potential distribution...
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