CN220604471U

CN220604471U - Flexible connection structure for high-voltage coil leading-out end of dry-type transformer

Info

Publication number: CN220604471U
Application number: CN202322328320.7U
Authority: CN
Inventors: 刘士跃; 丁雷
Original assignee: TIANJIN KUNPENG ELECTRONIC CO Ltd
Current assignee: TIANJIN KUNPENG ELECTRONIC CO Ltd
Priority date: 2023-08-29
Filing date: 2023-08-29
Publication date: 2024-03-15
Anticipated expiration: 2033-08-29

Abstract

The utility model relates to the technical field of flexible connection structures, in particular to a flexible connection structure for a high-voltage coil leading-out end of a dry-type transformer. The T-shaped winding lead wire and the winding are connected so as to facilitate the winding operation of the winding, the wiring position is easy to adjust, displacement and deformation are not easy to occur, meanwhile, the contact area between the winding lead wire and the winding is increased due to the T-shaped connection mode, cold welding and false welding are not easy to occur when air welding is performed, the unfolding surface area is large, heat dissipation is facilitated, and arc discharge and heating faults caused by factors such as excessive load of current are effectively avoided.

Description

Flexible connection structure for high-voltage coil leading-out end of dry-type transformer

Technical Field

The utility model relates to the technical field of flexible connection structures, in particular to a flexible connection structure for a high-voltage coil leading-out end of a dry-type transformer.

Background

On any cross section of the iron core column, the winding is sleeved outside the iron core column by the same cylindrical wire. Certain insulation gaps and heat dissipation channels (oil passages) are reserved between the high-voltage winding and the low-voltage winding and between the low-voltage winding and the iron core column, and the high-voltage winding and the low-voltage winding are separated by an insulation paperboard cylinder. The insulation distance is determined by the voltage class of the winding and the gap required for the heat dissipation path. When the low-voltage winding is placed inside and is close to the iron core column, the required insulation distance between the low-voltage winding and the iron core column is smaller, so that the size of the winding can be reduced, and the overall size of the whole transformer is also reduced. The wires connecting the respective outgoing ends of the windings outside the transformer windings are called leads, and electric power from an external power source is input to the transformer through the leads, and electric power transmitted through the leads is output from the transformer to the outside. The materials of the lead wire generally include: (1) the same enameled hard wire as the winding; (2) bare copper bar, application scope: 10 kV-level 6300kVA and below transformer; (3) paper wrapped round copper bar, application scope: 10-35 kV small-capacity transformers; (4) bare copper bar, application scope: a low voltage winding lead of 10kV and below; (5) copper stranded wires, application scope: leads of each voltage class, in particular 110kV and above; (6) copper pipe, application scope: 220kV and above. To ensure adequate insulation distance, the leads are insulated by laminated wood, cardboard, and must meet the requirements of electrical performance, mechanical strength, and temperature rise. The selection of the lead is also based on the electric field strength and mechanical strength, and the temperature rise during short circuit and long-term load. The outgoing line of the transformer winding is connected with the lead wire and the lead wire mainly in a brazing or gas welding mode. To ensure the insulation distance of the lead wire and withstand vibration and impact of electromotive force during operation, short circuit without displacement and deformation, a clamp must be employed to fasten the lead wire.

However, the prior art has the following disadvantages: the wiring is not easy to be carried out, the winding operation of the winding is inconvenient, the wiring position is not easy to be adjusted, and the displacement and the deformation are easy; the welding area is small, the false welding and the false welding are easy to generate, the unfolding surface area is small, the heat dissipation is not facilitated, and the arc discharge and the heating faults caused by the factors such as the excessive current load are easy to cause, so that the prior art needs to be improved.

Disclosure of Invention

The utility model aims to provide a flexible connection structure for a high-voltage coil leading-out end of a dry-type transformer, which solves the problems of difficult wiring, inconvenient winding operation of a winding, difficult adjustment of wiring positions and easy displacement and deformation; the welding area is small, the false welding and the false welding are easy to generate, the unfolding surface area is small, the heat dissipation is not facilitated, and the problems of arc discharge and heating faults caused by the factors such as excessive current load and the like are easy to cause.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides a flexible connection structure for dry-type transformer high-voltage coil draws forth end, includes base, support piece, top cap, the one end contact that ground was kept away from to the base has the bolt, the middle part of base is connected with the iron core, the middle-end outside contact of iron core has the winding, the both ends contact of winding has low-voltage coil, low-voltage coil and iron core fixed connection, the one end fixedly connected with support piece of iron core is kept away from to low-voltage coil, the one end fixedly connected with high-voltage coil of low-voltage coil is kept away from to support piece, high-voltage coil and winding contact, the air flue has been seted up between high-voltage coil and the low-voltage coil, the one end fixedly connected with top cap of base is kept away from to the iron core.

Preferably, the number of the bolts is two, the two bolts are symmetrically distributed on the base, and the bolts fix the base.

Preferably, the winding adopts a concentric structure, the winding is made of enameled hard wires, and the winding is subjected to pressure transformation treatment.

Preferably, the support member is made of an insulating cardboard tube, and supports the high-voltage coil.

Preferably, the middle part of top cap is provided with the lead wire, the one end contact that the top cap was kept away from to the lead wire has the link, and the top cap installs the lead wire.

Preferably, the number of the leads is multiple, the leads are uniformly distributed on the top cover, and the leads lead out the winding.

Compared with the prior art, the utility model has the following beneficial effects:

the T-shaped winding lead wire and the winding are connected so as to facilitate the winding operation of the winding, the wiring position is easy to adjust, displacement and deformation are not easy to occur, meanwhile, the contact area between the winding lead wire and the winding is increased due to the T-shaped connection mode, cold welding and false welding are not easy to occur when air welding is performed, the unfolding surface area is large, heat dissipation is facilitated, and arc discharge and heating faults caused by factors such as excessive load of current are effectively avoided.

Drawings

FIG. 1 is a front view of the overall structure of the present utility model;

FIG. 2 is a side view of the overall structure of the present utility model;

FIG. 3 is a top cross-sectional enlarged view of the high voltage coil of FIG. 1 of the present utility model;

FIG. 4 is a schematic diagram of the connection of the leads to the windings of the present utility model;

fig. 5 is a schematic view of a lead of the present utility model.

In the figure: 1. a base; 2. a bolt; 3. an iron core; 4. a winding; 5. a low voltage coil; 6. a support; 7. a high voltage coil; 8. an airway; 9. a top cover; 10. a lead wire; 11. and a connecting end.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1-5, a flexible connection structure for a high-voltage coil lead-out end of a dry-type transformer comprises a base 1, a supporting piece 6 and a top cover 9, wherein one end, far away from the ground, of the base 1 is contacted with two bolts 2, the two bolts 2 are symmetrically distributed on the base 1, the middle part of the base 1 is connected with an iron core 3, the outer side of the middle end of the iron core 3 is contacted with a winding 4, the winding 4 adopts a concentric structure, and the winding 4 is made of enameled hard wires.

Referring to fig. 1-5, two ends of a winding 4 are contacted with a low-voltage coil 5, the low-voltage coil 5 is fixedly connected with an iron core 3, one end of the low-voltage coil 5 far away from the iron core 3 is fixedly connected with a support member 6, the support member 6 is made of an insulating paperboard cylinder, one end of the support member 6 far away from the low-voltage coil 5 is fixedly connected with a high-voltage coil 7, the high-voltage coil 7 is contacted with the winding 4, and the winding 4 is subjected to transformation treatment.

Referring to fig. 1-5, an air channel 8 is provided between the high-voltage coil 7 and the low-voltage coil 5, one end of the iron core 3 away from the base 1 is fixedly connected with a top cover 9, a plurality of leads 10 are provided in the middle of the top cover 9, the plurality of leads 10 are uniformly distributed on the top cover 9, one end of the leads 10 away from the top cover 9 contacts with a connecting end 11, and the leads 10 lead out the winding 4.

The specific implementation process of the utility model is as follows: when the transformer is in operation, the T-shaped lead 10 and the winding 4 are connected so as to be easy to run, the winding operation of the winding 4 is convenient, the wiring position is easy to adjust, the displacement and deformation are not easy to occur, meanwhile, the contact area between the lead 10 and the winding 4 is increased in a T-shaped connection mode, virtual welding and false welding are not easy to occur when air welding is performed, the expansion surface area is large, heat dissipation is facilitated, arc discharge and heat dissipation faults caused by factors such as current oversubstance and the like are effectively avoided, the cross section area of a copper foil is deduced from the design capacity and current of the transformer (reference formula), (in formula 1, I is the current flowing through a wire, kt is the comprehensive heat dissipation coefficient and is related to the number setting condition of the wire, M and S are the cross section perimeter of the wire and the cross section area of the wire, T is the temperature rise of the surface of the wire and is equal to the difference between the surface temperature of the wire and the ambient temperature, p0 is the resistivity of the wire material at 0℃, and alpha is the temperature coefficient of the wire material.

Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A flexible connection structure for dry-type transformer high-voltage coil draws forth end, includes base (1), support piece (6), top cap (9), its characterized in that: the utility model discloses a high-voltage transformer, including base (1), low-voltage coil (3), support piece (6), high-voltage coil (7), winding (4) are connected with in the middle part that ground was kept away from to base (1), winding (4) are connected with in the middle part outside of iron core (3), the both ends contact of winding (4) has low-voltage coil (5), low-voltage coil (5) and iron core (3) fixed connection, one end fixedly connected with support piece (6) that iron core (3) was kept away from to low-voltage coil (5), one end fixedly connected with high-voltage coil (7) that low-voltage coil (5) was kept away from to support piece (6), high-voltage coil (7) and winding (4) contact, air flue (8) have been seted up between high-voltage coil (7) and the low-voltage coil (5), one end fixedly connected with top cap (9) that base (1) was kept away from to iron core (3).

2. The flexible connection structure for a high-voltage coil terminal of a dry-type transformer according to claim 1, wherein: the number of the bolts (2) is two, and the two bolts (2) are symmetrically distributed on the base (1).

3. The flexible connection structure for a high-voltage coil terminal of a dry-type transformer according to claim 1, wherein: the winding (4) adopts a concentric structure, and the winding (4) is made of enameled hard wires.

4. The flexible connection structure for a high-voltage coil terminal of a dry-type transformer according to claim 1, wherein: the support (6) is made of an insulating cardboard tube.

5. The flexible connection structure for a high-voltage coil terminal of a dry-type transformer according to claim 1, wherein: the middle part of top cap (9) is provided with lead wire (10), the one end that top cap (9) was kept away from to lead wire (10) contacts has link (11).

6. The flexible connection structure for a dry-type transformer high-voltage coil terminal as claimed in claim 5, wherein: the number of the leads (10) is plural, and the leads (10) are uniformly distributed on the top cover (9).