CN2517085Y

CN2517085Y - Gas insulation dry-type transformer

Info

Publication number: CN2517085Y
Application number: CN 02205152
Authority: CN
Inventors: 刘有斌
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-02-21
Filing date: 2002-02-21
Publication date: 2002-10-16
Anticipated expiration: 2012-02-21

Abstract

Transformers in an electric network are indispensable devices in energy transmission, and dry transformers are widely used because the dry transformers do not have oil and are free from leakage. The utility model adopts a dry transformer of gas insulation and comprises a transformer iron core and a transformer winding which are assembled in a box body, a radiator arranged on the box body and a heat exchanger arranged among the box body, the transformer iron core and the transformer winding; one side of the heat exchanger is tightly connected with the box body and the radiator, and the other side of the heat exchanger is tightly connected with the transformer iron core and the transformer winding. The utility model solves the problem of heat radiation of the transformer reliably, so the transformer has smaller volume and lower cost. The utility model is an ideal replacing product for the present transformers.

Description

Gas insulating dry transformer

Affiliated technical field

The utility model is a kind of novel electric equipment that carries out power transfer between different electric pressures in the electrical network.

Background technology

The application of transformer is very widely in the electric power system, all can be applied to from the power high voltage network to user side, is indispensable equipment in the system.In the prior art, transformer is divided into oil immersion and dry type two big classes, and oil-immersed type transformer brings a lot of problems because there is transformer oil will have problems such as leakage, deterioration of oil to operation and maintenance, has not become application trend of electric power system so there is oiling.Existing dry-type transformer is to adopt the epoxy casting mode basically, or other insulating material are fixed-type, because heat dissipation problem (does not have oil to dispel the heat as medium, the heat dispersion of air is relatively poor) volume of comparing iron core and winding with oil-immersed type transformer wants big, cost is just high, and the heat radiation when big capacity is one and is difficult to the problem that solves, limited it to jumbo development, under the situation of up to ten thousand kilovars or higher capacity, transformer all is an oil immersed type, brought difficulty for the development of no oiling, heat dissipation problem is the problem that will face in the design of transformer manufacturing always in fact, also is the problem that never obtains fine solution.

The iron core of transformer and winding all are to produce heat, and heat looses and do not go out, and will produce the temperature rise that oversteps the extreme limit, and transformer is burnt.In traditional design of transformer, iron core still is all will design air channel or oil duct in the winding, the air channel is a ventilation usefulness in the dry-type transformer, oil duct is the oil circuit that increases in the oil-immersed type transformer, promptly all be to adopt the mode of convection current that the heat transferred in the transformer is gone out, dry-type transformer adopts cross-ventilated mode, because of the heat transfer property difference of air a little, so need more bigger air channels, and the current density of winding is also selected lowlyer, these have all increased cost, than the transformer cost height with the oil immersion of capacity; Oil-immersed type transformer adopts transformer oil to come convection current, heat in transformer core and the winding is taken on the casing, and by the heat sink radiates on the casing in air because the heat transfer efficiency of transformer oil is high, the cost of its iron core and winding is also relative low.In a word, it all is the mode that adopts traditional convection current that the iron core of existing transformer and the heat of winding are derived, and convection current is the mode that a kind of heat conductivility will differ from relatively, can adopt a kind of better heat-conducting mode, can have greatly improved on performance and cost.

Summary of the invention

The purpose of this utility model provides a kind of novel gas insulating dry transformer, when making transformer reach fire-proof and explosion-proof, adopts this better heat-conducting mode of heat pipe again, makes the decline that raises the cost of the performance of transformer.

The said gas insulating dry transformer of the utility model, comprise transformer core and winding in the casing, gassy in the casing, casing is equipped with radiator outward, between casing and transformer core and the winding heat exchanger is arranged, heat exchanger closely is connected with casing and radiator on one side, and another side closely is connected with winding with transformer core.

Casing is the structure of closed, insulation gas filled in the casing, comprise sulphur hexafluoride, nitrogen, dry air etc., slight pressure in the casing is higher than outside the casing, thereby guarantee reasonable insulation property, because casing is airtight, can all uses indoor and outdoor, and can avoid common dry-type transformer because of the aging Insulation Problems of breaking and causing of epoxy.

Heat exchanger between casing and transformer core and the winding is a heat pipe, heat pipe is known one of the most effective heat transfer element, it can transmit a large amount of heats at a distance by its very little sectional area and need not additionaling power, and its thermal conductivity is considerably beyond any known metal.Heat pipe is airtight structure, the certain vacuum degree of inner maintenance, and be filled with certain liquid, and an end heated liquid can be vaporized in the pipe, becomes liquid again to other end cooling back gas, moves in circles, and the heat pipe two ends are almost not have the temperature difference.The Heat Transfer of Heat Pipe on Heat Pipe ability is surprising, its limit of the heat pipe of 4 millimeters internal diameters is transmitted energy can be above 5 kilowatts, heat on winding and the iron core can be delivered on casing and the radiator very soon, just no longer need the air channel, the current density of winding also can be selected bigger, the volume of iron core and winding can reduce a lot, thereby can reduce cost greatly.Winding should be identical with the temperature on the casing radiator with temperature on the iron core, this also can reduce the temperature rise of transformer greatly, overcome the higher and a series of problems brought of transformer temperature rise, the class of insulation of the used insulating material of transformer also can reduce, and also can reduce the loss of transformer when this reduces cost.

Its evaporation section of common heat pipe and condensation segment are that no compartment of terrain links together substantially, be independent structures one by one, be used in the gas insulating dry transformer, bring certain difficulty can for the coiling of winding, adopt evaporation section and the separated separate heat pipe of condensation segment, just can address this problem better.

The general selected material of thermotube wall is a metal material, good heat conductivity, but be used in the transformer, because the insulation property of metal material are poor, though solved the heat conduction problem, but brought Insulation Problems, so the tube wall of the evaporation section of heat pipe should be elected the insulating material of heat conduction as, not only heat conduction but also insulate, the thermal conductivity of this material should be greater than 1W/mK.

The utility model is compared with existing technology, because heat transfer efficiency improves, can reduce the volume and the cost of transformer significantly, and the temperature rise that has reduced transformer has reduced the loss of transformer simultaneously; Adopt the closed gas-insulated structure, can improve insulation property and reliability.

The utility model is a no oiling structure, with low cost and have distinguishing features such as reducing temperature rise and loss.

Description of drawings

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

Accompanying drawing 1 is a side-looking structural representation of the present utility model

Accompanying drawing 2 is a plan structure schematic diagram of the present utility model

Embodiment

In Fig. 1,2, the 1st, iron core, the 2nd, to the evaporation section of the separate type heat pipe exchanger of iron core heat radiation, the 3rd, to the evaporation section of the separate type heat pipe exchanger of low pressure winding heat radiation, the 4th, the low pressure winding, the 5th, to the evaporation section of the separate type heat pipe exchanger of high pressure winding heat radiation, the 6th, the high pressure winding, 7, the 8th, the pipe of connection evaporation section and condensation segment, the 7th, the pipe that steam passes through, the 8th, the pipe that condensed fluid returns, the 9th, the condensation segment of separate type heat pipe exchanger, the 10th, casing, the 11st, to the radiator of air heat radiation.Evaporation section 2 inwalls of separate type heat pipe exchanger closely contact with iron core 1, and the heat transferred of iron core 1 is gone out; Evaporation section 3 outer walls of separate type heat pipe exchanger closely contact with low pressure winding 4, and the heat transferred of low pressure winding 4 is gone out; To keep certain insulation distance between the evaporation section 2 of separate type heat pipe exchanger and the evaporation section 3 of separate type heat pipe exchanger.Evaporation section 5 inwalls and the low pressure winding of separate type heat pipe exchanger also have certain insulation distance, and outer wall closely contacts with high pressure winding 6, and the heat transferred of high pressure winding 6 is gone out.The condensation segment 9 of separate type heat pipe exchanger closely contacts with casing 10, and the outer correspondence position of casing is installed radiator 11, with all heat transferred of inside in air.The material of heat pipe evaporator section tube wall is chosen as the insulating material of heat conduction, guarantees thermal conductivity and insulating properties simultaneously.The condensation segment that connects separate type heat pipe exchanger is what separate with the pipe 7,8 of evaporation section in initial designs, and is just that it is airtight after winding installs, and injects liquid then and vacuumizes.Casing is airtight at last, also need vacuumize the back and inject other insulating gass, as sulphur hexafluoride, nitrogen etc.

Claims

1, a kind of gas insulating dry transformer, comprise transformer core and winding in the casing, gassy in the casing, casing is equipped with radiator outward, it is characterized in that: between described casing and transformer core and the winding heat exchanger is arranged, heat exchanger closely is connected with casing and radiator on one side, and another side closely is connected with winding with transformer core.

2, gas insulating dry transformer according to claim 1 is characterized in that: described casing is airtight structure, and the inside is full of insulating gas.

3, according to claim 1,2 described gas insulating dry transformers, it is characterized in that: described heat exchanger is a heat pipe.

4, gas insulating dry transformer according to claim 3 is characterized in that: all or part of material therefor of the tube wall of described heat pipe evaporator section is a heat-conducting insulation material, and the thermal conductivity of this material is greater than 1W/m K.

5, gas insulating dry transformer according to claim 3 is characterized in that: described heat pipe is evaporation section and the separated separate heat pipe of condensation segment.

6, gas insulating dry transformer according to claim 4 is characterized in that: described heat pipe is evaporation section and the separated separate heat pipe of condensation segment.