CN112951558A

CN112951558A - Oil-immersed transformer with cooling oil conservator

Info

Publication number: CN112951558A
Application number: CN202110295222.0A
Authority: CN
Inventors: 程子霞; 王晨辉; 务经纬; 罗金良; 邝勇; 张舒欣
Original assignee: Zhengzhou University
Current assignee: Zhengzhou University
Priority date: 2021-03-19
Filing date: 2021-03-19
Publication date: 2021-06-11
Anticipated expiration: 2041-03-19
Also published as: CN112951558B

Abstract

The invention provides an oil immersed transformer with a cooling oil conservator, which comprises a transformer box body and an oil conservator, wherein the oil conservator is arranged above the transformer box body, an upper oil groove is arranged in the oil conservator, a siphon component is arranged between the transformer box body and the upper oil groove, and a stirring device is arranged in the transformer box body. The invention has the following beneficial effects: under the condition of normal operation of the transformer, the function of a normal transformer oil conservator can be realized, and the heat dissipation effect of the transformer is improved to a certain extent; under the condition of abnormal operation of the transformer, all transformer oil above the lower end opening of the left side tube of the U-shaped tube can be quickly introduced into the transformer box body through the oil supply port II by utilizing the siphon principle, so that the temperature of the transformer oil is accelerated to be reduced until the liquid level of the transformer oil in the oil groove at the upper layer of the conservator is lower than the lower end opening of the left side tube of the U-shaped tube.

Description

Oil-immersed transformer with cooling oil conservator

Technical Field

The invention relates to the technical field of transformers, in particular to an oil immersed transformer with a cooling oil conservator.

Background

Common transformers can be classified into dry transformers and oil-immersed transformers according to cooling media, wherein the oil-immersed transformers are used in a wider range in daily life; dividing according to the capacity of the transformer: small and medium-sized transformers, large-sized transformers, and extra-large-sized transformers; dividing according to the number of windings: a double-winding transformer, a three-winding transformer; according to phase fraction: single-phase transformers, three-phase transformers; dividing according to the capacity of the transformer: medium and small sized transformers, large transformers, super large transformers.

In the prior art, an iron core of an oil-immersed transformer has a serious heating phenomenon in the process of running, and is cooled mainly by transformer oil. But the temperature of the transformer core is not evenly distributed and is higher at the upper part of the transformer core. However, because the liquid density changes with the temperature, the temperature of the transformer oil at the upper part is higher, and the temperature difference between the transformer core and the transformer oil is smaller, so that the heat of the transformer core at the upper part is more difficult to dissipate. Therefore, the service life of the whole transformer is shortened, the decomposition of transformer oil is easily caused, the internal pressure of the transformer is increased, and great potential safety hazards are caused.

Disclosure of Invention

The invention provides an oil immersed transformer with a cooling oil conservator, which solves the problems that the oil immersed transformer in the prior art is poor in heat dissipation performance, low in heat dissipation efficiency and high in temperature of transformer oil when abnormal operation occurs.

The technical scheme of the invention is realized as follows:

the utility model provides an oil-immersed transformer of area cooling conservator, including transformer box and conservator, the conservator sets up in transformer box top, and be equipped with upper oil groove in the conservator, be equipped with the siphon subassembly between transformer box and the upper oil groove, be equipped with agitating unit in the transformer box, can let in transformer oil of upper oil groove in the conservator in the transformer box through the siphon subassembly, agitating unit stirs transformer oil in the transformer box, the heat exchange of transformer oil and the heating element in the transformer box with higher speed, make the transformer rapid cooling.

The siphon assembly comprises a U-shaped pipe and a second oil supply pipe, the U-shaped pipe is arranged in the conservator and communicated with the transformer box body through the second oil supply pipe, transformer oil in the conservator is led into the transformer box body through the second oil supply pipe through the U-shaped pipe, a one-way valve is arranged on the second oil supply pipe, and the transformer oil is controlled to flow in the U-shaped pipe in a one-way mode.

The right side pipe length of U-shaped pipe is greater than U-shaped pipe left side pipe length, and U-shaped pipe right side pipe links to each other with supply oil pipe two, and U-shaped pipe left side pipe and upper oil groove intercommunication when the liquid level of upper oil groove transformer oil reaches a take the altitude, and the U-shaped pipe can let in transformer box with all transformer oil above its left side pipe lower extreme opening from the upper oil groove, and the transformer oil cooling is accelerated.

The transformer box goes out oil pipe and conservator intercommunication through going out oil pipe, is equipped with cooling device on going out oil pipe, and the oil feed end of transformer box is equipped with the check valve through supplying oil pipe one and conservator intercommunication on supplying oil pipe one, and cooling device cools off the transformer oil through going out oil pipe, and the check valve on supplying oil pipe one controls transformer oil one-way flow, makes the expanded transformer oil that is heated must get into the top oil groove through going out oil pipe.

Cooling device includes condenser tube and power device, and condenser tube divide into inlayer water pipe and outer water pipe, goes out the oil pipe and sets up in the inlayer water pipe, and power device communicates with each other with outer water pipe, and the expert has the cooling water in the outer water pipe, cools down to the transformer oil in the oil pipe through water circulation.

The cooling water pipe is a spiral pipe, the spiral pipe can increase the contact range of the transformer oil and the cooling water, the transformer oil is cooled more sufficiently, and the cooling effect is enhanced.

Agitating unit includes pivot and a plurality of blade, and the pivot is connected with the transformer box rotation, and the blade is fixed to be set up in the pivot, and the blade can be rotatory around the pivot, and supply oil pipe two lower extreme supply oil mouth two and blade to correspond, when utilizing the siphon principle to let in transformer oil in the conservator in the transformer box, transformer oil can assault the blade and make the blade rotate, and the blade stirs transformer oil in the transformer box for transformer oil's heat exchange.

The blades are distributed on the rotating shaft in a circumferential array mode, so that the blades are impacted and rotate stably and continuously.

Still communicate through exhaust passage between transformer box and the conservator, the last pressure valve that is equipped with of exhaust passage, gaseous gathering in transformer box upper portion is produced in transformer oil decomposition, when transformer box internal pressure reached a definite value, lets in gas in the conservator through exhaust passage, balances transformer box and transformer conservator's pressure, reduces transformer box internal pressure simultaneously.

The exhaust passage stretches into the interior of the oil conservator, and the opening at the upper end of the exhaust passage is higher than the highest point of the U-shaped pipe, so that transformer oil in the oil conservator cannot enter the transformer box body through the exhaust passage.

The invention has the following beneficial effects: under the condition of normal operation of the transformer, the function of a normal transformer oil conservator can be realized, and the heat dissipation effect of the transformer is improved to a certain extent; under the condition of abnormal operation of the transformer, the transformer oil is overheated to cause the transformer oil to expand greatly and decompose a large amount of gas from the transformer oil, so that the transformer oil in the transformer box body is extruded into the box body, when the liquid level of the transformer oil in the oil conservator rises to the highest point of the U-shaped pipe, the pressure valve of the exhaust passage is opened at the moment, the pressure of the transformer box body and the pressure of the transformer conservator are balanced, all the transformer oil above the lower end opening of the left side pipe of the U-shaped pipe can be quickly introduced into the transformer box body through the oil supply port II by utilizing the siphon principle, the temperature of the transformer oil is accelerated until the liquid level of the transformer oil in the oil groove on the upper layer of the oil conservator is lower than the lower end opening of the left side pipe of.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an oil-immersed transformer with a cooling conservator according to the present invention.

Fig. 2 is a schematic structural diagram of a transformer conservator.

In the figure: 1-a cooling water pipe, 2-a first oil supply port, 21-a first oil supply pipe, 3-a blade, 4-a second oil supply port, 41-a second oil supply pipe, 5-a conservator, 51-an upper oil groove, 6-a U-shaped pipe, 7-a power device, 8-a transformer box body, 9-an oil outlet pipe and 10-an exhaust channel.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.

Example 1, as shown in fig. 1, an oil immersed transformer with a cooling conservator includes a transformer tank 8 and an conservator 5, the conservator 5 is disposed above the transformer tank 8, an upper oil tank 51 is disposed in the conservator 5, a siphon assembly is disposed between the transformer tank 8 and the upper oil tank 51, the siphon assembly can utilize the siphon principle to introduce transformer oil in the upper oil tank 51 into the transformer tank 8, the siphon assembly includes a U-shaped tube 6 and a second oil supply tube 41, the U-shaped tube 6 is disposed in the conservator 5, the U-shaped tube 6 is communicated with the transformer tank 8 through the second oil supply tube 41, the transformer oil is introduced into the transformer tank 8 through the U-shaped tube 6 and the second oil supply tube 41, the right side tube length of the U-shaped tube 6 is greater than the left side tube length of the U-shaped tube 6, the right side tube of the U-shaped tube 6 is connected with the second oil supply tube 41, the left side tube of the U-shaped tube 6 is communicated with the upper oil tank 51, the transformer oil, the second oil supply pipe 41 is provided with a one-way valve, so that the transformer tank 8 can store gas decomposed from the transformer oil.

Further, be equipped with agitating unit in the transformer box 8, agitating unit stirs the transformer oil in the transformer box 8, the flow of transformer oil accelerates, improve the cooling efficiency of transformer oil, agitating unit includes pivot and a plurality of blade 3, the pivot rotates with transformer box 8 to be connected, the fixed setting of blade 3 is in the pivot, blade 3 can stir transformer oil around the pivot rotation, and blade 3 is the circumference array distribution in the pivot, supply two 4 of oil feed mouth of two 41 lower extremes of fuel feeding pipe correspond with blade 3, utilize the siphon principle to strike blade 3 from the transformer oil that conservator 5 got into in the transformer box 8, rotation for blade 3 provides power, make blade 3 rotate and stir transformer oil, the cooling of accelerating transformer.

Embodiment 2, an oil-immersed transformer of area cooling conservator, 8 oil pipe ends of transformer box are through going out oil pipe 9 and conservator 5 intercommunication, and the play oil pipe interface of transformer box 8 is located 8 upper positions of transformer box, the concrete position is the position of 8 hotspots of transformer box, namely the transformer oil temperature highest point, be equipped with cooling device on going out oil pipe 9, cooling device cools off the transformer oil through going out oil pipe 9, guarantee the radiating efficiency of transformer, the oil inlet end of transformer box 8 is through supplying oil pipe 21 and conservator 5 intercommunication, be equipped with the check valve on supplying oil pipe 21, the flow direction of check valve control transformer oil, make the expanded transformer oil that receives heat must pass through out oil pipe 9 from transformer box 8 and get into in the conservator 5, and store the gaseous storage that the transformer oil decomposes in transformer box upper portion.

Further, cooling device includes condenser tube 1 and power device 7, condenser tube 1 divide into inlayer water pipe and outer water pipe, condenser tube 1 is the spiral pipe, it sets up in the inlayer water pipe to go out oil pipe 9, the area of contact of multiplicable play oil pipe 9 and outer water pipe, improve cooling efficiency, power device 7 communicates with each other with outer water pipe, in this embodiment, the expert has the cooling water in the outer water pipe, power device 7 is the water pump, the water pump drives the cooling water and lasts the flow in the outer water pipe, guarantee cooling device to transformer oil's cooling efficiency. The other structure is the same as embodiment 1.

Embodiment 3, as shown in fig. 2, in an oil immersed transformer with a cooling conservator, a transformer tank 8 and an conservator 5 are further communicated through an exhaust passage 10, the exhaust passage 10 can introduce gas generated by decomposition of transformer oil into the conservator 5 from the transformer tank 8, the transformer oil in the conservator enters the tank through a first oil supply port, so that the transformer oil in the transformer tank 8 is continuously kept in a full state to ensure continuous cooling of the transformer oil, the exhaust passage 10 extends into the conservator 5, an opening at an upper end of the exhaust passage 10 is higher than a highest point of a U-shaped tube 6, a pressure valve is arranged on the exhaust passage 10, when the pressure in the transformer tank 8 reaches a certain value, a liquid level of the transformer oil in the transformer conservator is higher than the highest point of the U-shaped tube at this time, a set value of the pressure valve is reached, the pressure valve is opened, the gas in the transformer tank 8 enters the, the siphon assembly starts to act by balancing the pressure inside the transformer tank 8 and the conservator 5. The other structure is the same as embodiment 1 or embodiment 2.

The working principle is as follows: the transformer starts, transformer work iron core produces the heat, transformer oil is heated and can produces liquid volume inflation, and transformer oil can be because pyrolysis produces gas, gaseous top accumulation at transformer box 8, along with the inflation of transformer oil and the increase of transformer box 8 internal gas pressure, transformer oil in the transformer box 8 can get into the inside upper oil groove 51 of conservator 5 through play oil pipe 9, meanwhile, cooling device begins work, cooling device cools off the transformer oil through play oil pipe 9, transformer oil gathering after the cooling is in upper oil groove 51. When the transformer works abnormally and the temperature of the transformer exceeds the rated operation temperature, a large amount of gas decomposed by the transformer oil is gathered at the upper layer of the transformer box body 8, the liquid level of the transformer oil in the upper oil tank 51 in the oil conservator 5 rises, when the liquid level of the transformer oil in the upper oil tank 51 reaches the highest point of the U-shaped pipe 6, the pressure valve on the exhaust passage 10 is opened, the gas at the upper layer of the transformer box body 8 enters the oil conservator 5 through the exhaust passage 10, the pressure in the transformer box body 8 and the oil conservator 5 is balanced, the siphoning phenomenon is generated, the one-way valve on the oil supply pipe II 41 is opened, the transformer oil in the upper oil tank 51 enters the transformer box body 8 through the U-shaped pipe 6, the transformer oil in the oil conservator enters the box body through the oil supply opening I, the transformer box body 8 is filled with the transformer oil, and meanwhile, the opening, the transformer oil in the transformer box body 8 is subjected to rapid heat exchange, the cooling of the transformer is accelerated, the temperature of the transformer oil in the transformer box body 8 is more balanced, and the reliability of the transformer under the condition of abnormal operation is improved.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. The utility model provides a take oil immersed transformer of cooling conservator, includes transformer box (8) and conservator (5), its characterized in that, conservator (5) set up in transformer box (8) top, and are equipped with upper oil groove (51) in conservator (5), are equipped with the siphon subassembly between transformer box (8) and upper oil groove (51), are equipped with agitating unit in transformer box (8).

2. The oil-immersed transformer with the cooling conservator as claimed in claim 1, wherein the siphon assembly comprises a U-shaped pipe (6) and a second oil supply pipe (41), the U-shaped pipe (6) is arranged in the conservator (5), the U-shaped pipe (6) is communicated with the transformer tank (8) through the second oil supply pipe (41), and the second oil supply pipe (41) is provided with a one-way valve.

3. The oil-immersed transformer with the cooling conservator as claimed in claim 2, wherein the length of the right side tube of the U-shaped tube (6) is greater than that of the left side tube of the U-shaped tube (6), the right side tube of the U-shaped tube (6) is connected with the second oil supply tube (41), and the left side tube of the U-shaped tube (6) is communicated with the upper oil groove (51).

4. The oil-immersed transformer with the cooling conservator as claimed in claim 1, 2 or 3, wherein the oil outlet end of the transformer tank (8) is communicated with the conservator (5) through an oil outlet pipe (9), the oil outlet pipe (9) is provided with a cooling device, the oil inlet end of the transformer tank (8) is communicated with the conservator (5) through a first oil supply pipe (21), and the first oil supply pipe (21) is provided with a one-way valve.

5. The oil-immersed transformer with the cooling conservator according to claim 4, characterized in that the cooling device comprises a cooling water pipe (1) and a power device (7), the cooling water pipe (1) is divided into an inner water pipe and an outer water pipe, the oil outlet pipe (9) is arranged in the inner water pipe, and the power device (7) is communicated with the outer water pipe.

6. Oil filled transformer with cooling conservator according to claim 5, characterized in that the cooling water pipe (1) is a spiral pipe.

7. The oil-immersed transformer with the cooling conservator as claimed in claim 1 or 5, wherein the stirring device comprises a rotating shaft and a plurality of blades (3), the rotating shaft is rotatably connected with the transformer box body (8), the blades (3) are fixedly arranged on the rotating shaft, and the second oil supply port (4) at the lower end of the second oil supply pipe (41) corresponds to the blades (3).

8. Oil filled transformer with cooling conservators according to claim 7, wherein the blades (3) are distributed in a circumferential array on the rotating shaft.

9. Oil-filled transformer with cooling conservator according to claim 2, 5 or 8, characterized in that the transformer tank (8) and the conservator (5) are communicated through an exhaust channel (10), and a pressure valve is arranged on the exhaust channel (10).

10. Oil filled transformer with cooling conservator according to claim 9, characterized in that the exhaust channel (10) is extended into the conservator (5) and the upper opening of the exhaust channel (10) is higher than the highest point of the U-shaped tube (6).