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Voltage transformer with air duct cooling and secondary fusing

A technology of voltage transformers and air ducts, applied in the direction of inductors, transformer/inductor cooling, transformer/inductor magnetic cores, etc., can solve the problems of difficult transformer replacement, unsatisfactory heat dissipation performance, complicated wiring, etc. The effect of burning or bursting, reducing subsequent effects, and increasing the speed of heat dissipation

Pending Publication Date: 2019-05-14
ZHEJIANG HORIZON INSTR TRANSFORMERS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, the 4PT solution only needs to be realized in two ways. The first is the 4PT integrated solution. This solution has problems such as large size, high cost, complicated wiring, and difficulty in replacing the original transformers that have been put into operation. The other is Split 4PT scheme, that is, connect a zero-sequence PT in series at the end of the original YY wiring PT to realize the 4PT wiring scheme. Compared with the 4PT integrated transformer, this scheme has significant advantages: the cost is low, and the installation and replacement are relatively simple; However, this solution also has the common defects of traditional transformers: the heat dissipation performance is not ideal, there is no protection measure for the back-end electrical appliances, and it has been burned or even exploded under extreme conditions

Method used

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  • Voltage transformer with air duct cooling and secondary fusing
  • Voltage transformer with air duct cooling and secondary fusing
  • Voltage transformer with air duct cooling and secondary fusing

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Experimental program
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Effect test

Embodiment 1

[0024] see Figure 2-3 , a voltage transformer with air duct heat dissipation and secondary fusing, including a secondary coil 4 located in the primary coil 3, the secondary coil 4 is hollow inside and is interspersed with a ring-shaped iron core 5, and the lower end of the iron core 5 is wrapped Below the bottom of the primary coil 3, on the top of the primary coil 3 there is a primary coil hoisting bracket 2 welded to it by soldering, on the top of the primary coil hoisting bracket 3 there is a primary M10 insert 1, and there are two primary M10 inserts 1 And all are welded with the primary coil 3 through the conductive copper sheet, and the secondary melting pipe structure 9 is welded and connected to the bottom of the primary coil 3, and the secondary melting pipe structure 9 includes the secondary melting pipe insert 6 and the secondary melting pipe insert. The secondary outlet insert 7 on part 6, when installing, one end of the primary M10 insert 1 is connected to the hi...

Embodiment 2

[0030]The difference from Embodiment 1 is that the iron core 5 is an exposed structure on both sides. This design can make it dissipate the heat generated by the ferromagnetic resonance of the voltage transformer at the fastest speed, the existence of the air duct structure 8 and the existence of the iron core. 5 The exposed installation method can greatly improve the heat dissipation capacity of the transformer itself, thereby reducing the temperature rise of the transformer to a certain extent, thereby improving the load carrying capacity of the transformer to a certain extent, and increasing the capacity of the transformer performance.

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Abstract

The invention discloses a voltage transformer with air duct cooling and secondary fusing. The voltage transformer comprises a secondary coil, wherein the secondary coil is arranged in a primary coil,the second coil is hollow in an inner part, an annular iron core is arranged in the secondary coil in a penetrating way, a lower end of the iron core wraps the bottom of the primary coil, a primary coil hanging support is arranged at the top of the primary coil and is welded by tin soldering, primary M10 embedment pieces are arranged at the top of the primary coil hanging support, the two primaryM10 embedment pieces both are welded with the primary coil by a conductive copper sheet, and a secondary fuse tube structure is welded and connected with the bottom of the primary coil. Different a traditional fully-enclosed mutual inductor, an air duct cooling structure is additionally arranged between the primary coil and the secondary coil, an allowable current of the transformer is effectivelylimited by a secondary fuse protection device, the transformer is exposed by a cut iron core, an overvoltage and overcurrent phenomenon generated by system resonance is prevented from three points, so that the probability of burnt or explosion due to heating by harmonic influence of the mutual inductor is effectively reduced.

Description

technical field [0001] The invention relates to the technical field of transformer heat dissipation, in particular to a voltage transformer with an air channel for heat dissipation and secondary fusing. Background technique [0002] As a high-precision device for converting voltage signals, electromagnetic voltage transformers are mainly used for the measurement of electricity consumption in the subsequent power system and the protection of the power system, and play a vital role in the power system. [0003] However, with the development of society and the advancement of science and technology, a large number of power electronic devices and nonlinear load devices are connected to the power grid, such as arc steelmaking furnaces, thyristor variable current power supply equipment, electric locomotives, chemical rectifiers, DC transmission converters Substations and other frequency conversion equipment, etc., lead to frequent current distortions in the power system, making the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F38/26H01F27/08H01F27/24H01F27/30H01F27/32H01F27/40
Inventor 叶飞吴春风王建
Owner ZHEJIANG HORIZON INSTR TRANSFORMERS
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