Test device carrying out generator iron core magnetization under voltage and method thereof

Abstract

The invention discloses a test device carrying out generator iron core magnetization under voltage and a method thereof; the test device comprises the following units: switchgear connected with a voltage source and having over-current and open-phase protection; a rectification inversion module connected with a switchgear outgoing line so as to continuously adjust voltage amplitude and frequency; an excitation transformer connected with the rectification inversion module so as to lift up the test voltage outputted by the rectification inversion module; a high capacity single-phase wattless automatic compensation module connected with the excitation transformer so as to compensate the wattless current in the test voltage and reduce the power supply capacity needed in the test; an excitation coil connected with the excitation transformer and used for inducing magnetic flow on a generator sample in the test, wherein the excitation coil is in one turn, and formed by a plurality of insulation cables arranged in parallel; a control table respectively connected with the switchgear, the rectification inversion module and the high capacity single-phase wattless automatic compensation module, and controlling same. The test device and method can reduce the test needed power supply capacity, and can simplify test wiring, thus reducing test preparation time.

Description

technical field [0001] The invention belongs to the related technical field of electrical equipment test and detection, and in particular relates to a test device and method for magnetizing a generator iron core under low voltage. Background technique [0002] The stator core of the generator is mainly composed of silicon steel sheets laminated and assembled. Due to poor quality during manufacturing and maintenance, or due to thermal and mechanical forces during operation, insulation damage between silicon steel sheets can cause short circuits in the short circuit area. The formation of local overheating threatens the safe operation of the unit. For this reason, when the generator is handed over, or when there is doubt about the insulation of the core during operation, or after all or part of the core is repaired, a magnetization test of the stator core is required to measure the loss per unit mass of the core and measure the temperature of the iron yoke and teeth. , Check ...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the technical problems of existing generators such as high applied voltage for iron core magnetization test, large required power supply capacity, complicated test wiring, large impact of closing current on the power supply, and large deviation between test magnetic flux and theoretical value, a method for using at low Test device and method for magnetizing generator core under voltage

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