CN2785106Y

CN2785106Y - Dry type solid insulating transformer with water-cooling coil

Info

Publication number: CN2785106Y
Application number: CN 200520053895
Authority: CN
Inventors: 霍崇业; 曾锦江
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-01-21
Filing date: 2005-01-21
Publication date: 2006-05-31
Anticipated expiration: 2015-01-21

Abstract

The utility model discloses a dry type solid insulating transformer with a water-cooling coil. The utility model is characterized in that the inner and the outer surfaces of a coil are respectively provided with a f stainless steel water jacket, and a sheet type radiator is arranged outside a transformer body; the water jackets and the sheet type radiator are connected by a water channel; the coil cooling is realized by natural circulation or forced circulation, and solid insulation is respectively formed among coil windings, layers, the major insulation, etc. As the utility model uses water cooling to take the place of the air cooling of a conventional dry transformer and uses solid insulation to take the place of air gap insulation, the dimensions of an iron window of a transformer is made to be decreased, copper wires and silicon sheets are saved, and the power transformation cost is saved. The utility model can be used for various occasions, such as indoor occasions, outdoor occasions, box transformation, underground transformation, etc., and can also be used for all occasions which have the copper loss of larger coils and need to reduce the temperature rise of the coils, such as a special transformer, a reactor, etc.

Description

Coil is with water-cooled dry solid insulating transformer

Technical field

The utility model belongs to the power transformer field, relates generally to a kind of coil with water-cooled dry solid insulating transformer.

Background technology

Dry-type transformer does not have oil and fire-retardant characteristics with it, is widely used in urban distribution network and all occasions that fire protection requirement is arranged, about 3,000 ten thousand KVA of domestic annual production.Its primary structure of dry-type transformer that uses both at home and abroad has two kinds at present, and a kind of is epoxy cast dry transformer, and another kind is that we opens the ventilated type dry-type transformer.With the epoxy resin enclosed winding of thin layer, the latter then forms surperficial paint film with vacuum pressure impregnation and protects winding with poured with epoxy resin for the former, the common ground of the two be all with air as coolant and main dielectric.Compare with traditional oil-immersed power transformer, these two kinds of dry-type transformers do not have greasy dirt and the fire-retardant fireproof characteristic are arranged, but owing to nearly ten times of cross-ventilation cooling raio oil cooling efficient differences, and the air insulation distance is also much bigger than the oil-insulation distance, this makes dry-type transformer barred window size increase its no-load loss much larger than oil-immersed power transformer, and copper and silicon steel sheet consumption are also much larger than oil immersed power transformer.

The utility model content

The purpose of this utility model is to provide a kind of coil with water-cooled dry solid insulating transformer, adopt water cooling to replace the air cooling of conventional dry-type transformer, the air insulation that replaces conventional dry-type transformer with solid insulation, excellent in heat dissipation effect not only, and insulation distance is more much smaller than air-gap, has saved copper cash and silicon steel sheet consumption.

Coil of the present utility model mainly comprises the transformer body with water-cooled dry solid insulating transformer, tube connector, tank, communicating valve and outer radiator, the transformer body mainly comprises iron core, low-voltage coil, high-tension coil, solid insulation and water jacket, iron core is identical with conventional laminated core structure, high, water jacket is placed on the low-voltage coil surface, innermost layer is an inner water sleeve, outer being separated by by solid insulation of inner water sleeve is wound with low-voltage coil afterwards, low-voltage coil outer by solid insulation be separated by place in water jacket, middle water jacket is wound with high-tension coil after being separated by by solid insulation, and outer being separated by by solid insulation of high-tension coil placed outer water jacket; The high and low pressure coil by interior, domestic and abroad water jacket, solid insulation and grounded metal shell encapsulated, forms an integral body except that outlet, be inserted in and form the transformer body in the iron core; In described, domestic and abroad water jacket is the stainless steel water jacket, its upper and lower end all links to each other with tank by tube connector, tank is connected with outer radiator by communicating valve, the formation water circulation channel.

Described in, domestic and abroad water jacket each be welded by semicylindrical corrosion resistant plate, perhaps constitute by some stainless steel tubes.

Described outer radiator is a gilled radiator.

Loop construction and conventional F class F insulation epoxy dry-type transformer are similar, and just the high and low pressure coil is by stainless steel water jacket, solid insulation and grounded metal shell encapsulated.

The utility model water is as coolant, and the viscosity of water is much lower than transformer oil, thereby radiating effect is poor unlike oil-immersed power transformer; In addition, as dielectric, its insulation size is also near oil-immersed power transformer with solid insulation for the utility model.As seen the utility model has kept the advantage of oil-immersed power transformer to a certain extent, but it is again not have oil simultaneously, has also kept the advantage that dry-type transformer is fire-retardant and no greasy dirt dyes.

Because the high and low pressure coil sealed by metal shell and solid insulation except that outlet, there is not the cushion block laying dust of conventional dry-type transformer, along problems such as face are creepage, it is minimum that its maintenance load can reduce to.

The utility model compared with prior art has following beneficial effect:

(1) the utility model replaces the air cooling of conventional dry-type transformer with water cooling, at coil surface the stainless steel water jacket is set, and has water channel to link to each other with outer radiator, can realize the circulation of natural circulation or force water, excellent in heat dissipation effect;

(2) the utility model replaces the air insulation of conventional dry-type transformer with solid insulation, between its coil and coil be solid insulation entirely between over the ground, its insulation distance is more much smaller than air-gap, and coil between iron core iron yoke and the non-in-phase coil because coil case ground connection and need not insulation distance, make that whole barred window size is dwindled, its effect is that copper cash and silicon steel sheet consumption can significantly reduce, and no-load loss and load loss reduce, and transformer noise reduces.

Description of drawings

Fig. 1 is the structural representation of coil with a phase coil of water-cooled dry solid insulating transformer.

Among the figure: the outer radiator of the outer water jacket 5-solid insulation 6-low-voltage coil 7-high-tension coil 8-grounded metal housing 9-tube connector 10-tank 11-communicating valve 12-of water jacket 4-among the 1-iron core 2-inner water sleeve 3-

Embodiment

In order to understand the utility model better, the utility model is done to describe further below in conjunction with accompanying drawing.

Coil of the present utility model mainly comprises transformer body, tube connector 9, tank 10, communicating valve 11 and outer radiator 12 with water-cooled dry solid insulating transformer.As shown in Figure 1, the transformer body mainly comprises iron core 1, low-voltage coil 6, high-tension coil 7, solid insulation 5 and water jacket, iron core 1 is identical with conventional laminated core structure, the high and low pressure coil surface is placed water jacket, innermost layer is an inner water sleeve 2,2 outer being separated by by solid insulation 5 of inner water sleeve are wound with low-voltage coil 6 afterwards, low-voltage coil 6 outer by solid insulation 5 be separated by place in water jacket 3, middle water jacket 3 is wound with high-tension coil 7 after being separated by by

solid insulation

5, and 7 outer being separated by by solid insulation 5 of high-tension coil are placed outer water jacket 4; The high and low pressure coil is sealed by interior, domestic and abroad water jacket, solid insulation 5 and grounded metal housing 8 except that outlet, forms an integral body, is inserted in and forms the transformer body in the iron core 1; Interior, domestic and abroad water jacket is the stainless steel water jacket, and its upper and lower end all links to each other with tank 10 by tube connector 9, and tank 10 is connected with outer radiator 12 by communicating valve 11, forms water circulation channel.

Interior, domestic and abroad water jacket respectively is welded by semicylindrical corrosion resistant plate, perhaps is made of some stainless steel tubes; Outer radiator is a gilled radiator; Loop construction and conventional F class F insulation epoxy dry-type transformer are similar, and just the high and low pressure coil is by stainless steel water jacket, solid insulation and grounded metal shell encapsulated.

Identical with conventional transformer, interior, the domestic and abroad water jacket with manufacture craft of the structure of iron core 1 is independently made before coil winding.

High and low pressure coil winding and water jacket put procedure are as follows: at first place inner water sleeve 2 on winding former, tighten and place the insulation bedding and padding after coiling low-voltage coil 6, low-voltage coil 6 outer insulation bedding and padding and the middle water jackets 3 placed, tighten and place the insulation filler strip then, coiling high-tension coil 7 is placed insulation filler strip and outer water jacket 4 at last.

Above-mentioned high and low pressure coil and water jacket are unloaded the back because inside and outside water jacket and the upper and lower metal shell body of coil have formed mould by integral body, pouring solid insulation material and form an integral body subsequently, this integral body is inserted in the iron core, with tube connector 9 interior, domestic and abroad water jacket is connected with upper and lower tank 10 respectively then, tank 10 is connected with outer radiator 12 by communicating valve 11, forms water circulation channel.

Gilled radiator can constitute natural circulation or forced circulation with the water in the water jacket, and its structure is identical with the gilled radiator of existing oil-immersed type transformer.For small capacity transformer, the natural circulation between water jacket and the outer radiator is enough to satisfy the requirement that reduces temperature rise; Can adopt the way force water circulation that increases water pump, better heat-radiation effect like this for high-power transformer.

Various occasions such as that the utility model can be used for is indoor, outdoor, case change, buried change, all have big coil copper loss and need to reduce the occasion of coil temperature rise also to be applicable to special transformer, reactor etc.

Claims

1. a coil is with water-cooled dry solid insulating transformer, it is characterized in that mainly comprising the transformer body, tube connector, tank, communicating valve and outer radiator, the transformer body mainly comprises iron core, low-voltage coil, high-tension coil, solid insulation and water jacket, high, water jacket is placed on the low-voltage coil surface, innermost layer is an inner water sleeve, outer being separated by by solid insulation of inner water sleeve is wound with low-voltage coil afterwards, low-voltage coil outer by solid insulation be separated by place in water jacket, middle water jacket is wound with high-tension coil after being separated by by solid insulation, and outer being separated by by solid insulation of high-tension coil placed outer water jacket; The high and low pressure coil by interior, domestic and abroad water jacket, solid insulation and grounded metal shell encapsulated, forms an integral body except that outlet, be inserted in and form the transformer body in the iron core; In described, domestic and abroad water jacket is the stainless steel water jacket, its upper and lower end all links to each other with tank by tube connector, tank is connected with outer radiator by communicating valve, the formation water circulation channel.

2. coil according to claim 1 is with water-cooled dry solid insulating transformer, it is characterized in that described in, domestic and abroad water jacket each be welded by semicylindrical corrosion resistant plate, perhaps constitute by some stainless steel tubes.

3. coil according to claim 2 is characterized in that with water-cooled dry solid insulating transformer described outer radiator is a gilled radiator.