CN202977138U

CN202977138U - Rectifier transformer

Info

Publication number: CN202977138U
Application number: CN 201220755778
Authority: CN
Inventors: 闫峰; 贺同伟; 吴迪; 刘洋
Original assignee: 闫峰
Priority date: 2012-12-29
Filing date: 2012-12-29
Publication date: 2013-06-05
Anticipated expiration: 2022-12-29

Abstract

The utility model relates to a rectifier transformer. The rectifier transformer comprises an iron core, low-voltage windings, grounding screens, and a high-voltage winding, wherein the low-voltage windings and the high-voltage winding are wound on the outer side of the iron core from inside to outside, the grounding screens are placed among the low-voltage windings and the high-voltage winding, the number of the low-voltage windings is two, the low-voltage windings are respectively an upper low-voltage winding and a lower low-voltage winding, the grounding screens are respectively an upper grounding screen and a lower grounding screen, the upper grounding screen and the upper low-voltage winding are correspondingly arranged, and the lower grounding screen and the lower low-voltage winding are correspondingly arranged. An existing grounding screen is divided into two independent parts up and down, and the two grounding screens respectively correspond to the two low-voltage windings, and therefore a harmonic wave current which flows through the grounding screens is largely reduced, heating of the grounding screens is effectively decreased, and occurrence of the grounding default of the low-voltage windings is avoided.

Description

A kind of rectifier transformer

One, technical field:

The utility model relates to transformer, what be specifically related to is a kind of rectifier transformer.

Two, background technology:

Rectifier transformer is the power transformer of rectifying installation, is widely used in the industries such as electrochemical industry, traction DC power supply, transmission DC power supply, direct current transportation.As shown in Figure 1, existing rectifier transformer is comprised of iron core 1, low pressure winding, earthing, high pressure winding 6 etc.Iron core 1 outer felt is around low pressure winding, high pressure winding, and the low pressure winding has two, is respectively low pressure winding 2, lower low pressure winding 3, is earthing between the high and low pressure winding.What the earthing of this rectifier transformer adopted is all the earthing that one whole Copper Foil consists of, the common corresponding earthing of upper low pressure winding 2 and lower low pressure winding 3, the rectifier transformer of this structure exists capacity current excessive, easily causes the fault of construction of transformer low voltage winding earth.Rectifier transformer is when operation, and the voltage of low pressure winding seriously distorts, and contains a large amount of high order harmonic components, and the coupling capacitance between Transformer Winding and earthing, the transformer low voltage winding also has electric capacity over the ground to the cable of rectifier.Under the effect of higher harmonic voltage, have capacity current in the loop that is formed by electric capacity, low pressure winding, cable, earthing and flow through.Because earthing has adopted one whole Copper Foil, its area is large, and winding is large to earthing electric capacity, makes high frequency voltage produce very large harmonic current between low pressure winding and earthing, easily causes transformer low voltage winding earth accident.

Three, summary of the invention:

The purpose of this utility model is to provide a kind of rectifier transformer, and this rectifier transformer is used for solving existing rectifier transformer and is in operation and the problem of low pressure winding earth accident frequently occurs.

The technical scheme that its technical problem that solves the utility model adopts is: this rectifier transformer comprises iron core, low pressure winding, earthing, high pressure winding, the iron core outside is wound around low pressure winding, high pressure winding from inside to outside, earthing between low pressure winding, high pressure winding, the low pressure winding has two, be respectively low pressure winding, lower low pressure winding, earthing has upper and lower two, wherein goes up earthing and the corresponding setting of upper low pressure winding, lower earthing and the corresponding setting of lower low pressure winding.

Beneficial effect:

The utility model is divided into up and down independently two parts with an original earthing, two respectively corresponding two low pressure windings of earthing, greatly reduce to flow through the harmonic current of earthing, effectively reduced the earthing heating, avoided the generation of low pressure winding earth fault.

Four, description of drawings:

Fig. 1 is the structural representation of existing rectifier transformer;

Fig. 2 is structural representation of the present utility model.

5 times earthings of earthing, 6 high pressure windings on 3 times low pressure windings 4 of low pressure winding on 1 iron core 2.

Five, embodiment:

Below in conjunction with accompanying drawing, the utility model is described further:

As shown in Figure 2, this rectifier transformer comprises iron core 1, low pressure winding, earthing, high pressure winding 6, iron core 1 outside is wound around low pressure winding, high pressure winding 6 from inside to outside, earthing between low pressure winding, high pressure winding 6, the low pressure winding has two, is respectively low pressure winding 2, lower low pressure winding 3, and earthing has upper and lower two, wherein go up earthing 4 and the corresponding setting of upper low pressure winding 2, lower earthing 5 and the corresponding setting of lower low pressure winding 3.

The utility model transform the earthing that is made of the monoblock Copper Foil between original rectifier transformer high pressure winding, low pressure winding as be made of two blocks of Copper Foils two earthings, two respectively corresponding two low pressure windings of earthing, cut off the current path between the two parts of up and down, greatly reduced to flow through the harmonic current of earthing, effectively reduce the earthing heating, avoided the generation of low pressure winding earth fault.

Claims

1. rectifier transformer, it is characterized in that: this rectifier transformer comprises iron core (1), the low pressure winding, earthing, high pressure winding (6), iron core (1) outside is wound around the low pressure winding from inside to outside, high pressure winding (6), the low pressure winding, the high pressure winding is earthing between (6), the low pressure winding has two, be respectively low pressure winding (2), lower low pressure winding (3), on earthing has, lower two, wherein go up earthing (4) and the corresponding setting of upper low pressure winding (2), lower earthing (5) and the corresponding setting of lower low pressure winding (3).