Voltage transformer

A technology for voltage transformers and components, applied in the field of transformers, can solve the problems of voltage transformer primary winding end breakdown, inability to meet the needs of power grid operation, and increased transformer volume, etc., and achieves large surface creepage and secondary load. Large, size-reduced effects

Inactive Publication Date: 2011-05-18
宁波三爱互感器有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When a single-phase ground fault and resonance occur, the resonance eliminator plays the role of voltage division, and the voltage at the neutral point rises, but the insulation level at the end of the primary winding of the voltage transformer is only 5kV, which cannot meet the actual operation needs of the power grid, and voltage mutual inductance often occurs Breakdown accident at the end of the primary winding of the device
If a fully insulated structure is used in the assembly of the switchgear, the volume of the transformer will increase, thereby increasing the volume of the entire switchgear

Method used

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Examples

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Embodiment 1

[0022] Such as figure 1 The shown 35KV voltage transformer includes an insulator 1 of conventional shape, the overall height of the insulator is 566 mm, and the inside of the insulator is sealed with an iron core 2 , winding components wound on the iron core 2 and a support frame. The iron core is in the shape of a "mouth", and the above-mentioned winding parts are wound on the horizontal axis of the iron core, and the winding parts include: the secondary winding 3 wound directly on the outer surface of the insulating copper 10 outside the iron core, wound on the The outer surface of the secondary winding is an insulating layer 4 with a thickness of 5 mm made of PMP polyester film capacitor paper, the primary winding 5 wound on the outer surface of the insulating layer, and the uniform winding wound on the outer surface of the primary winding. Pressure ring 6. The above-mentioned iron core wound with winding components is integrally installed on the support frame 7, and the s...

Embodiment 2

[0026] Different from the first embodiment, the winding component further includes a compensation coil 11 wound on the outer surface of the insulated copper outside the iron core and adjacent to the secondary winding. If the product has an unsatisfactory error after pouring, it can be adjusted through the additional compensation coil to make the error reach the best state.

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Abstract

The invention relates to a voltage transformer, comprising a winding part wound on an iron core, wherein the winding part and the iron core are both sealed in an insulator, the voltage transformer is characterized in that the winding part comprises a secondary winding directly wound on an external surface of the iron core, an insulating layer wound on an external surface of the second winding, a primary winding wound on an external surface of the insulating layer, and a grading ring wound on an external surface of the primary winding. Compared with the prior art, the voltage transformer of the invention has the following advantages: insulation level of a tail end of the primary winding is improved to 20kV so as to satisfy high voltage caused by voltage division of a resonance eliminator, secondary load is large, precision is high, surface creepage distance is large, the grading ring is placed on the primary winding, and the iron core is covered with semiconductor materials, so that the whole product has uniform electric field and has no suspension potential. If the product has unsatisfactory error after casting, the product can be adjusted by externally adding a compensation coil so as to achieve optimal state of the error.

Description

technical field [0001] The invention relates to the technical field of transformers, in particular to a voltage transformer. Background technique [0002] The structure of most voltage transformers includes an iron core with winding parts. The winding parts and the iron core are sealed in an insulator made of epoxy resin mixture. A support frame is connected to the bottom of the iron core. The support frame A bottom plate for installation is arranged below. [0003] The primary neutral point of the currently produced 35KV grounding voltage transformer should be directly grounded, and many users ground the primary neutral point through a resonance eliminator in order to prevent the transformer from being burned due to overvoltage caused by resonance and single-phase grounding faults. When a single-phase ground fault and resonance occur, the resonance eliminator plays the role of voltage division, and the voltage at the neutral point rises, but the insulation level at the end...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F38/24H01F27/28H01F27/32H01F27/24
Inventor 陈伟
Owner 宁波三爱互感器有限公司
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