Power supply capacity compensation method in transformer three-phase partial discharge experiment

Abstract

The invention provides a power supply capacity compensation method in a transformer three-phase partial discharge experiment. The method comprises the steps that the compensation reactance values of adjustable reactors L1, L2 and L3 are preset to be L11, L21 and L31; the frequency and voltage of a variable frequency power supply are adjusted; When the voltage is between 50 and 100V, the adjustable reactors and a tested transformer are in a parallel resonant state, the resonant frequencies are determined as f11, f21 and f31; according to a formula described in the description, the inlet capacitance of the tested transformer is C1, C2 and C3 respectively; when the resonant frequency is 250HZ, the compensation reactance values of the adjustable reactors are L12, L22 and L32; the compensation reactance values of the adjustable reactors are adjusted to L12, L22 and L32; the frequency of the variable frequency power supply is adjusted, and the adjustable reactors and the tested transformer are in a parallel resonant state above 250HZ; and the voltage of the variable frequency power supply is adjusted to test voltage. Power supply capacity needed by the partial discharge experiment can be reduced. The nearby power supply of the transformer can be used to carry out the experiment.

Description

technical field [0001] The invention relates to the technical field of transformer single-phase partial discharge testing, and more specifically, relates to a power supply capacity compensation method in transformer three-phase partial discharge testing. Background technique [0002] With the rapid development of my country's industrial economy, the demand for electricity has grown rapidly. Due to the different distribution of resources and load centers in my country, today's my country mainly adopts the west-to-east power transmission mode, and long-distance direct current transmission came into being in this environment. As the core equipment of power transmission, its reliable operation plays an extremely important role in the stability of the power system. [0003] The transformer partial discharge test belongs to the transformer handover test item. It is an important means to test the aging or deterioration of the insulation caused by the discharge inside the transformer...

AI Technical Summary

Problems solved by technology

During the partial discharge test of the transformer, due to the large no-load loss of the transformer itself, a large power supply capacity is required during the partial discharge test, but the on-site air switch cannot meet the requirements, and the power supply needs to be connected from a far distribution room. Insufficient wire length will prevent the test from being carried out

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