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Ultra-low frequency alternating-current (AC) constant-current demagnetization device of large transformer or mutual inductor and demagnetization detection method

A technology for transformers and transformers, which is applied in the field of ultra-low frequency AC constant current demagnetization devices for large transformers or transformers. It can solve the problems of long demagnetization time, complicated operation, and long time. impact effect

Inactive Publication Date: 2010-05-05
武汉市长江电气发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The demagnetization process of this method is not easy to keep consistent, and the measured magnetization curve has a large difference in the initial part
At present, the AC demagnetization method under power frequency is still widely used, but this method takes a long time, the equipment is huge, and the operation is also very complicated.
After the DC test, the electric power department generally demagnetizes by directly applying power or adopting a resonance test method. This method takes a long time to demagnetize, about 7-8 hours, and it is easy to cause the relevant relay protection action of the transformer. At the same time, direct closing will cause Powerful surge impact will cause deformation of transformer winding, etc., which will affect the life of transformer

Method used

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  • Ultra-low frequency alternating-current (AC) constant-current demagnetization device of large transformer or mutual inductor and demagnetization detection method
  • Ultra-low frequency alternating-current (AC) constant-current demagnetization device of large transformer or mutual inductor and demagnetization detection method

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Embodiment Construction

[0019] The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings, but they do not constitute a limitation to the present invention, and at the same time, the advantages of the present invention will become clearer and easier to understand.

[0020] See attached figure 1 It can be seen that: large-scale transformer or transformer ultra-low frequency AC constant current demagnetization device of the present invention, it comprises display 1, CPU control unit 2, described CPU control unit 2 and industrial frequency signal generator 3 (frequency is generally 50Hz, and voltage is 3 -4 volts, also can adopt other frequency or voltage) to connect, described industrial frequency signal generator 3 is connected with voltage power amplifier 4 (voltage is amplified to 100 volts), and voltage power amplifier 4 is connected with voltage booster 5, Described CPU control unit 2 is also connected with ultra-low frequency signal...

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Abstract

The invention relates to an ultra-low frequency alternating-current (AC) constant-current demagnetization device of a large transformer or mutual inductor, comprising a display (1) and a CPU control unit (2), wherein the CPU control unit (2) is connected with a power-frequency signal generator (3); the power-frequency signal generator (3) is connected with a voltage power amplifier (4); the voltage power amplifier (4) is connected with a voltage booster (5); the CPU control unit (2) is also connected with an ultra-low frequency signal generator (6); a switch is arranged between a transformer or a mutual inductor (8) to be tested and the voltage booster (5); and a switch is arranged between the transformer or the mutual inductor (8) to be tested and a current power amplifier (7). The invention overcomes the defects of long demagnetization time, easy transformer coil deformation, and the like of the traditional method and has the advantages of short demagnetization time, light equipment weight, and the like. The invention also discloses a demagnetization detection method adopting the demagnetization device.

Description

technical field [0001] The invention relates to an ultra-low frequency AC constant current demagnetization device for a large transformer or transformer, and also relates to a demagnetization detection method using the demagnetization device. Background technique [0002] Transformer or transformer is an important equipment in the power system. Its safety and stability are very important to the operation of the entire power system. During steady-state operation, the excitation current of the transformer is only 1% to 2% of its rated current. However, when the transformer is switched on again after the DC resistance test, a large inrush current will be generated. Its peak value can be tens to hundreds of times of the rated current. If the residual magnetism of the transformer is large, the decay of this transient current is relatively slow, and it generally lasts for several seconds to tens of seconds before reaching a steady state. This is extremely unfavorable to the opera...

Claims

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Application Information

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IPC IPC(8): H01F13/00G01R33/12
Inventor 胡汉童刘纯纯
Owner 武汉市长江电气发展有限公司
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