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Demagnetization method of transformer and demagnetization equipment

A degaussing method and transformer technology, applied in the field of transformers

Active Publication Date: 2016-10-12
保定市金源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, at present, there are only degaussing methods for single-phase transformers and three-phase three-column wye transformers without neutral points, but how to demagnetize other types of transformers (such as three-phase three-column angular transformers, three-phase three-column wye transformers with neutral points) Transformer and three-phase five-column star-shaped transformer with neutral point) effectively degaussing is a technical problem faced by those skilled in the art

Method used

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  • Demagnetization method of transformer and demagnetization equipment
  • Demagnetization method of transformer and demagnetization equipment
  • Demagnetization method of transformer and demagnetization equipment

Examples

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Effect test

Embodiment 1

[0069] see figure 1 , figure 1 It is a flowchart of a degaussing method for a three-phase three-column angle transformer disclosed by the present invention. Wherein, the three-phase three-column angle transformer includes a first iron core provided with an A-phase winding, a second iron core provided with a B-phase winding, and a third iron core provided with a C-phase winding. The degaussing method includes:

[0070] Step S11: Short-circuit the first winding of the three-phase three-column angle transformer.

[0071] Wherein, the first winding of the three-phase three-column angular transformer is any one of the A-phase winding, B-phase winding and C-phase winding of the three-phase three-column angular transformer.

[0072] What needs to be explained here is that the connection methods of the three-phase three-column angle transformer include forward connection and reverse connection. Among them, when the three-phase three-column angle transformer adopts the sequential c...

Embodiment 2

[0094] see image 3 , image 3 It is a flow chart of the degaussing method for the three-phase three-column star-shaped transformer with a neutral point disclosed in the second embodiment of the present invention. Among them, the three-phase three-column star-shaped transformer with a neutral point includes a first iron core provided with an A-phase winding, a second iron core provided with a B-phase winding, a third iron core provided with a C-phase winding, and a neutral point . The degaussing method includes:

[0095] Step S31: Short-circuit the input end of the first winding of the three-phase three-column wye transformer with a neutral point to the neutral point.

[0096] Wherein, the first winding of the three-phase three-column star-shaped transformer with neutral point is any one of the A-phase winding, B-phase winding and C-phase winding of the three-phase three-column star-shaped transformer with neutral point.

[0097] Step S32: applying a single-phase degaussin...

Embodiment 3

[0111] see Figure 5 , Figure 5 It is a flow chart of the degaussing method for the three-phase five-column star-shaped transformer with a neutral point disclosed in the third embodiment of the present invention. Among them, the three-phase five-column star-shaped transformer with a neutral point includes a first iron core provided with an A-phase winding, a second iron core provided with a B-phase winding, a third iron core provided with a C-phase winding, a first side Yoke, second side yoke and neutral point. The degaussing method includes:

[0112] Step S51: Short-circuit the input end of the first winding of the three-phase five-column wye transformer with a neutral point to the neutral point.

[0113] Wherein, the first winding of the three-phase five-column star-shaped transformer with neutral point is any one of A-phase winding, B-phase winding and C-phase winding of the three-phase five-column star-shaped transformer with neutral point.

[0114] Step S52: Apply a ...

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Abstract

The embodiment of the invention discloses a demagnetization method of a three-phase three-limb angle transformer. The method comprises the steps as follows: a first winding of the three-phase three-limb angle transformer is short-circuited; a single-phase demagnetization power supply is applied to an input end of the first winding of the three-phase three-limb angle transformer, and an iron core on which the first winding is located is demagnetized; and short-circuit connection of the first winding is disconnected, a second winding of the three-phase three-limb angle transformer is short-circuited, the single-phase demagnetization power supply is applied to an input end of the second winding of the three-phase three-limb angle transformer, and an iron core on which the second winding is located is demagnetized. According to the demagnetization method, the three-phase transformer is equivalent to single-phase transformers with approximately equal magnetic circuit sectional areas through short-circuit connection operation on the specific windings; and effective overall demagnetization of the transformer is completed by the single-phase demagnetization power supply through two commutation demagnetization operations. The embodiment of the invention further discloses demagnetization equipment.

Description

technical field [0001] The invention belongs to the technical field of transformers, in particular to a degaussing method and degaussing equipment for transformers. Background technique [0002] When the transformer is out of operation and after the DC resistance test of the transformer, residual magnetism will be generated in the transformer. If the transformer is put into operation in this state, excitation inrush current and overvoltage will be generated, which seriously threatens the safety of the power grid system and power equipment. Therefore, before the transformer is put into operation, the residual magnetism in the transformer must be eliminated to ensure the normal operation of the transformer. [0003] However, at present, there are only degaussing methods for single-phase transformers and three-phase three-column wye transformers without neutral points, but how to demagnetize other types of transformers (such as three-phase three-column angular transformers, thr...

Claims

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Application Information

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IPC IPC(8): H01F27/28H01F13/00H01F30/12
CPCH01F13/006H01F27/28H01F30/12
Inventor 王永辉田喜乐
Owner 保定市金源科技有限公司
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