Voltage transformer excitation characteristic test system

Abstract

The invention provides a voltage transformer excitation characteristic test system. The voltage transformer excitation characteristic test system includes a power frequency voltage source (1) and a direct current source (2) which is connected in series with the power frequency voltage source (1). According to the voltage transformer excitation characteristic test system of the invention, the power frequency voltage source and the direct current source which are in serial connection are simultaneously applied to the primary side of a tested voltage transformer, so that the direct current source is at a low electric level, and therefore, the voltage level of the direct current source can be decreased, and test requirements can be satisfied, and thus, the influence of the direct current source on the excitation characteristics of the voltage transformer can be authentically simulated based on the superimposed power frequency voltage source and direct current source; and based on the superimposition of the power frequency voltage source and the direct current source, the voltage transformer excitation characteristic test system is small in size, and therefore, production cost can be reduced.

Description

technical field [0001] The invention relates to the technical field of high-voltage testing of power systems, and more specifically relates to a testing system for excitation characteristics of voltage transformers. Background technique [0002] 10kV and 35kV power grids frequently blow the primary side fuses of potential transformers (PTs) during operation, and even cause PTs to burn out and explode in severe cases. After research and analysis, the main reason for the fusing of the fuse on the primary side of the PT is that during the recovery process of the ground fault, when the DC current component flows through the primary winding of the PT, the magnetic saturation of the iron core of the PT occurs, which in turn causes ferromagnetic resonance between the capacitance to ground and the PT. Eventually the PT was burned. [0003] In order to reduce the occurrence of PT being burned, it is usually to detect the excitation characteristics of PT, so as to prevent the occurre...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a voltage transformer excitation characteristic test system to solve the problem that the detection equipment in the prior art described in the background technology cannot directly and truly simulate the actual operating state of the PT high voltage side

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