Lightning impulse test circuit and method for capacitive composite insulated busbar system

Abstract

The invention provides a lightning impulse testing circuit and a lightning impulse testing method used for a capacitive composite insulation busbar system. The lightning impulse testing circuit comprises an impulse voltage source, an impulse voltage measuring device, a low pass filtering device, and a tested capacitive composite insulation busbar system. One end of the impulse voltage source is connected with the low pass filtering device, and the other end of which is connected with the high voltage end of the impulse voltage measuring device and the high voltage end of the tested capacitive composite insulation busbar system. The other end of the impulse voltage source is connected with the low voltage end of the impulse voltage measuring device and the low voltage end of the tested capacitive composite insulation busbar system, and is grounded. The low pass filtering device is formed by parallely connecting a capacitor Cp with a resistor Rp. The testing circuit is simple in layout, and the determining of the parameters of the circuit is convenient, and is easy to realize. The testing method satisfies testing requirements of nominal capacitance 5000pF and below capacitive composite insulation busbar lightning impulse tests, and completely satisfies requirements of a GB / T16927.1-2011 standard and a GB / T 22838.-2008 standard on lightning impulse experiment waveform parameters.

Description

[0001] 【Technical field】 [0002] The invention relates to the technical field of busbar type tests, in particular to a lightning impulse test circuit and method for a capacitive composite insulated busbar system. [0003] 【Background technique】 [0004] At present, in the medium-voltage power distribution system, there are still bare busbars still in use. In high-voltage and ultra-high-voltage power grids, bare busbars are also used to connect power station electrical components. Due to the use of bare busbars, small animals, wet and dirty insulation environments and altitude The height will affect the reliability of the electrical insulation of the busbar, and the phase spacing between the HGIS composite electrical appliances and the overhead bare busbar is very large. In order to solve the above problems, currently high-voltage, ultra-high-voltage GIS, HGIS and transformers use a large number of SF 6 Gas outlet casing and oil-paper insulation casing, but the price of this s...

AI Technical Summary

Problems solved by technology

However, the body inductance is a fixed value and the capacitance of the capacitive composite insulated bus bar under test is much larger than that of the general bus bar. Therefore, only by adjusting the wave head resistance value cannot meet the requirements of wave front time and overshoot in relevant standards at the same time.

So for this special product, the existing lightning impulse test scheme is no longer suitable

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