Demagnetizing method based on converter transformer direct-current resistance measuring device

Abstract

The invention discloses a demagnetizing method based on a converter transformer direct-current resistance measuring device. The converter transformer direct-current resistance measuring device comprises a direct-current current generator, a polarity-adjustable circuit, a direct-current resistance measuring module and a switch control module in sequence. The demagnetizing method comprises the stepsthat a demagnetizing strategy time current correspondence table is created, and the switch control module controls the direct-current current generator and the polarity-adjustable circuit to output corresponding current to demagnetize a converter transformer according to the demagnetizing strategy time current correspondence table. By means of the demagnetizing method, according to the specific demagnetizing strategy time current correspondence table, the switch control module is operated; based on a direct-current frequency conversion attenuation method principle, the converter transformer is demagnetized. The converter transformer is demagnetized after being subjected to a direct-current resistance test, the test time can be saved, test equipment can be reduced, the steps of maintainingthe transformer are reduced, demagnetizing is directly conducted after the test, and the demagnetizing effect is obvious.

Description

technical field [0001] The invention relates to the technical field of converter transformers, in particular to a demagnetization method based on a converter transformer DC resistance measuring device. Background technique [0002] When the DC resistance measurement test of the converter transformer is carried out, it is often necessary to add a DC current to the transformer that is much larger than the normal working condition of the converter transformer. After the test, there will be a large amount of residual magnetism in the converter transformer, which will affect the air conditioner load test, load test and normal operation. Therefore, it is urgent to demagnetize the converter transformer after the DC resistance measurement experiment. [0003] The existing DC demagnetization devices are often independent of the DC resistance measuring device, which increases the test procedure, and cannot accurately adjust the demagnetization current according to the hysteresis loop...

AI Technical Summary

Problems solved by technology

[0003] The existing DC demagnetization devices are often independent of the DC resistance measurement device, which increases the test procedure, and cannot accurately adjust the demagnetization current according to the hysteresis loop to produce the best demagnetization effect

However, to generate low-frequency polarity variable current, the device is often too large, which causes disadvantages such as inconvenient test, long test time, poor demagnetization effect, and high price.

Images