CN206523415U - A kind of thermal ageing test device of non-uniform heat flux sleeve pipe oilpaper - Google Patents

Abstract

The utility model discloses a kind of thermal ageing test device of non-uniform heat flux sleeve pipe oilpaper, including power supply and experimental box, provided with aging equipment and the insulating paper being wrapped in outside the aging equipment in the experimental box, aging equipment in experimental box is divided into, in, lower three parts, with three heating element heaters, three parts are heated respectively, each part is set to reach different temperature, so as to do the experiment of nonuniform heating to being wrapped in the insulating paper outside aging equipment, actual working environment of the insulating paper in transformer can be simulated, so as to analyze degree of aging of the insulating paper in real work exactly.

Description

A thermal aging experimental device for non-uniform heating sleeve oil paper

technical field

The utility model relates to an accelerated thermal aging experiment device, in particular to a thermal aging experimental device for non-uniformly heating casing oil paper.

Background technique

Transformer bushing is an important component of electrical equipment. It is used for the insulation of high-voltage leads of electrical equipment such as transformers and reactors from the metal casing. It is an important part of the power system. Its insulation performance directly affects whether the power grid can operate safely and stably. During the operation of the transformer, the copper tube in the bushing will pass a large current, and due to the thermal effect of the current, the copper tube will generate heat. During continuous operation, the heat generated by the copper tubes accumulates and cannot be dissipated in time, and accumulates in the casing, which will cause the temperature inside the casing to rise. The inner insulation of the oil-immersed bushing is wrapped with insulating paper on the copper tube. Therefore, the temperature change in the bushing will affect the aging degree of the insulating oil paper, thereby affecting the insulation performance of the oil-immersed bushing.

During the actual operation of the transformer, the upper part of the bushing has the highest temperature due to the influence of the heat generated by the drain wire; the temperature at the bottom of the bushing is higher due to the influence of the transformer oil temperature, but lower than the temperature of the upper part of the bushing; the middle part of the bushing is the overall temperature of the bushing. the coldest part. Therefore, the overall axial temperature distribution of the bushing is uneven, resulting in inconsistent axial aging degrees of the same insulating oil paper wrapped on the copper tube.

However, at present, when conducting thermal aging experiments on insulating oil paper at home and abroad, the aging box is generally used to uniformly heat the insulating oil paper, which cannot simulate the working environment where the insulating oil paper is heated unevenly. Therefore, when studying the properties of bushing insulation materials in this way, large deviations often occur.

Utility model content

The purpose of this utility model is to provide a thermal aging experiment device for unevenly heating casing oil paper to solve the problem that in the prior art, a single aging box is used to uniformly heat insulating oil paper, which cannot simulate the working environment of uneven heating of insulating oil paper The problem.

The utility model provides a thermal aging experiment device for non-uniformly heating casing oil paper, which comprises: a power supply and an experiment box;

The test box is provided with an aging device and insulating paper wrapped outside the aging device;

The aging device includes a first fixed cover, a first copper tube, a first heat insulation layer, a second copper tube, a second heat insulation layer, a third copper tube and a second fixed cover;

The aging device consists of the first fixed cover, the first copper pipe, the first heat insulation layer, the second copper pipe, the second heat insulation layer, the third copper pipe and the second fixed cover connected sequentially from top to bottom ;

The first copper tube, the second copper tube, and the third copper tube have the centers of the upper and lower bottom surfaces of the three copper tubes respectively located on the central axis of the experimental box;

The inside of the first copper tube is wrapped with a first heating ring;

A second heating ring is wrapped inside the second copper tube;

A third heating ring is wrapped inside the third copper tube;

The power supply is respectively connected to the first heating ring, the second heating ring, and the third heating ring through wires;

Insulating oil is housed in the experiment box.

Further, the thermal aging test device for non-uniform heating casing oil paper includes: a test box, a first hose, an oil pump, a second hose, an oil tank, a third hose and a control device;

The experiment box is connected to the oil pump through the first hose;

The oil pump is connected to the oil tank through the second hose;

The fuel tank is connected to the experiment box through the third hose;

The oil tank is provided with insulating oil and a heating device;

The experiment box is provided with a first temperature sensor, a second temperature sensor, a third temperature sensor, and a fourth temperature sensor;

The first temperature sensor is arranged outside the first copper pipe;

The second temperature sensor is arranged outside the second copper pipe;

The third temperature sensor is arranged outside the third copper pipe;

The fourth temperature sensor is arranged at the bottom of the experiment box;

The first temperature sensor, the second temperature sensor, the third temperature sensor and the fourth temperature sensor are respectively connected with the control device.

Further, the first heating ring, the second heating ring, and the third heating ring are all thermistors.

Further, the first fixed cover, the first copper pipe, the first heat insulation layer, the second copper pipe, the second heat insulation layer, the third copper pipe and the second fixed cover are sequentially connected with insulating glue from top to bottom .

Further, the first copper pipe, the second copper pipe, and the third copper pipe are respectively connected with the corresponding first heating ring, second heating ring, and third heating ring with insulating glue.

Further, the power supply is a 12V DC power supply.

Further, a bracket is provided outside the experiment box.

The utility model provides a thermal aging experiment device for non-uniform heating sleeve oil paper. The aging device in the experiment box is divided into upper, middle and lower parts, and three heating elements are used to heat the three parts respectively. , so that each part reaches a different temperature, so as to conduct an experiment of uneven heating on the insulating paper wrapped outside the aging device. It can simulate the actual working environment of insulating paper in the transformer, so as to accurately analyze the aging degree of insulating paper in actual work.

Description of drawings

In order to illustrate the technical solution of the present application more clearly, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, for those of ordinary skill in the art, on the premise of not paying creative labor, Additional drawings can also be derived from these drawings.

Fig. 1 is the structural representation of a kind of thermal aging experimental device of non-uniform heating casing oil paper provided by the application;

Fig. 2 is the front view of aging device in Fig. 1;

Fig. 3 is a top view of the aging device in Fig. 1 after the fixing covers at both ends are removed.

Among them, 1-the first fixed cover, 2-the first copper pipe, 3-the first heating ring, 4-the first heat insulation layer, 5-the second copper pipe, 6-the second heating ring, 7-the first Two insulation layers, 8-the third copper pipe, 9-the third heating ring, 10-the second fixed cover, 11-power supply, 12-the first hose, 13-oil pump, 14-the second hose, 15 -Fuel tank, 16-third hose, 17-bracket, 18-experiment box, 19-fourth temperature sensor, 20-third temperature sensor, 21-second temperature sensor, 22-first temperature sensor, 23-control device, 24-aging device, 25-insulating paper.

detailed description

The utility model provides a thermal aging experiment device for non-uniformly heating casing oil paper, comprising: a power supply 11 and an experiment box 18;

The test box 18 is provided with an aging device 24 and an insulating paper 25 wrapped outside the aging device 24;

The aging device 24 includes a first fixed cover 1, a first copper tube 2, a first heat insulation layer 4, a second copper tube 5, a second heat insulation layer 7, a third copper tube 8 and a second fixed cover 10;

The aging device 24 consists of the first fixed cover 1, the first copper pipe 2, the first heat insulation layer 4, the second copper pipe 5, the second heat insulation layer 7, the third copper pipe 8 and the second fixed cover 10 from connected sequentially from top to bottom;

The first copper tube 2, the second copper tube 5, and the third copper tube 8 are located on the central axis of the experimental box 18 with the centers of the upper and lower bottom surfaces of the three copper tubes in total;

The inside of the first copper tube 2 is wrapped with a first heating ring 3;

The second copper tube 5 is wrapped with a second heating ring 6;

The third copper tube 8 is wrapped with a third heating ring 9;

The power supply 11 is respectively connected to the first heating ring 3, the second heating ring 6, and the third heating ring 9 through wires;

Insulating oil is housed in the described experiment box 18 .

Fig. 2, Fig. 3 are a kind of specific embodiment of the aging device described in the utility model, now in conjunction with Fig. 2, Fig. 3 concretely describes the structure of this embodiment: the experiment box includes the aging device 24 and is wrapped in the aging device 24 External insulating paper 25;

The aging device 24 includes a first fixed cover 1, a first copper tube 2, a first heat insulation layer 4, a second copper tube 5, a second heat insulation layer 7, a third copper tube 8 and a second fixed cover 10; The first fixed cover 1 is a cylinder with a diameter of 300 mm and a height of 25 mm; the bottom is connected with a first copper tube 2 with an inner diameter of 290 mm, an outer diameter of 300 mm, and a height of 100 mm. The first copper tube 2 is wrapped with an inner diameter of 280 mm. The first heating ring 3 with an outer diameter of 290 mm and a height of 100 mm is used to heat the first copper pipe 2; a second copper pipe 5 is connected under the first copper pipe 2, with an inner diameter of 190 mm and an outer diameter of 300 mm in the middle , the first heat insulation layer 4 with a height of 25mm is used to hinder the heat transfer between the first copper pipe 2 and the second copper pipe 5; the inner diameter of the second copper pipe is 290mm, the outer diameter is 300mm, and the height is 800mm. Wrapped with a second heating ring with an inner diameter of 280mm, an outer diameter of 290mm, and a height of 800mm, it is used to heat the second copper tube 5; the second copper tube 5 is connected with a third copper tube 8, and an internal heating ring is provided in the middle. The second heat insulation layer 7 with a diameter of 190mm, an outer diameter of 300mm and a height of 25mm is used to hinder the heat transfer between the second copper pipe 5 and the third copper pipe 8; the inner diameter of the third copper pipe 8 is 290mm, and the outer diameter is 300mm, 100mm high, wrapped inside with a third heating ring with an inner diameter of 280mm, an outer diameter of 290mm, and a height of 100mm, which is used to heat the third copper tube 8; the third copper tube 8 is connected to the second fixed cover 10. The second fixed cover 10 is a cylinder with a diameter of 300 mm and a height of 25 mm.

The working principle of the utility model: the experiment box is equipped with insulating oil, and the aging device placed in the insulating oil is composed of upper, middle and lower parts, and each part is composed of a copper tube and a heating ring. It is separated by a heat insulation layer, and the upper and lower bottom surfaces are respectively provided with fixed covers. Use DC power to supply power to the three parallel heating rings, so that the three heating rings can reach different temperatures, and each part performs a thermal aging test on the insulating paper wrapped outside the aging device.

It can be seen from the above technical scheme that this experiment wraps the insulating paper on the outside of the aging device with different temperatures, conducts a thermal aging experiment on the insulating paper, and truly simulates the working environment of the insulating paper in the transformer, so that the insulating paper can be accurately analyzed. The degree of aging in actual work.

Further, the thermal aging test device of the non-uniform heating sleeve oil paper includes: an experiment box 18, a first hose 12, an oil pump 13, a second hose 14, an oil tank 15, a third hose 16 and a control device twenty three;

The experiment box 18 is connected with the oil pump 13 through the first hose 12;

The oil pump 13 is connected with the oil tank 15 through the second flexible pipe 14;

The fuel tank 15 is connected with the experiment box 18 through the third hose 16;

The oil tank 15 is provided with insulating oil and a heating device;

The first temperature sensor 22, the second temperature sensor 21, the third temperature sensor 20, and the fourth temperature sensor 19 are arranged in the experiment box 18;

The first temperature sensor 22 is arranged outside the first copper pipe 2;

The second temperature sensor 21 is arranged outside the second copper pipe 5;

The third temperature sensor 20 is arranged outside the third copper pipe 8;

The fourth temperature sensor 19 is arranged at the bottom of the experiment box 18;

The first temperature sensor 22 , the second temperature sensor 21 , the third temperature sensor 20 and the fourth temperature sensor 19 are respectively connected to the control device 23 .

The test box 18 is provided with a first temperature sensor 22, a second temperature sensor 21, a third temperature sensor 20, a fourth temperature sensor 19, insulating oil, an aging device 24 and an insulating paper 25 wrapped outside the aging device;

The experiment box 18 is connected with the oil pump 13 through the first hose 12 , the oil pump 13 is connected with the oil tank 15 provided with insulating oil and heating device through the second hose 14 , and the oil tank 15 is connected with the experiment box 18 through the third hose 16 . The test box 18, the first hose 12, the oil pump 13, the second hose 14, the oil tank 15, and the third hose 16 constitute a closed circulation system for the circulation of insulating oil. The first temperature sensor 22 is arranged outside the first copper pipe 2 for measuring the temperature of the first copper pipe 2, and the second temperature sensor 21 is arranged outside the second copper pipe 5 for measuring the temperature of the second copper pipe. 5, the third temperature sensor 20 is arranged on the outside of the third copper pipe 8 for measuring the temperature of the third copper pipe 8, and the fourth temperature sensor 19 is arranged at the bottom of the experiment box 18 for measuring The temperature at the bottom of the test box 18.

The working principle of this embodiment: the DC power supply 11 respectively supplies the first heating ring 3 located in the first copper tube 2, the second heating ring 6 located in the second copper tube 5, and the heating ring located in the third copper tube 8. The third heating ring 9 supplies power, and the first heating ring 3 with different Curie temperatures, the second heating ring 6, and the third heating ring 9 are connected in parallel; when the temperature of the heating ring reaches its preset Curie temperature, the heating ring will stop heating; when the temperature of the heating ring is lower than its Curie temperature, it will resume the heating state; the control system 23 directly communicates with the first temperature sensor 22 outside the first copper tube 2, the second copper tube 5. The second external temperature sensor 21, the third external temperature sensor 20 of the third copper pipe 8 is connected with the fourth temperature sensor 19 for collecting the temperature data in the experimental box 18, and controlling the oil tank with heating device according to the obtained data. The heating state of 15 and the flow rate of the oil pump 13 keep the temperature in the test box 18 at 80°C. When the temperature in the test box 18 is lower than 80°C, the control system 23 will turn on the heating device in the oil tank 15 to increase the heat supply and The flow rate of the insulating oil is adjusted through the oil pump 13, and the speed of heat dissipation is adjusted; when the temperature in the test box 18 is higher than or equal to 80°C, the control system 23 will turn off the heating device in the oil tank 15 with the heating device, stop the heat supply, and pass the oil pump 13. Adjust the flow rate of insulating oil to adjust the speed of heat dissipation.

Further, the first heating ring 3, the second heating ring 6, and the third heating ring 9 are all thermistors with a positive temperature coefficient, and the resistance value of the thermistor varies with temperature. The change can increase the heat production coefficient of the heating ring, and after the power is turned on, the temperature can reach the preset temperature faster.

Further, the first fixed cover 1, the first copper pipe 2, the first heat insulation layer 4, the second copper pipe 5, the second heat insulation layer 7, the third copper pipe 8 and the second fixed cover 10 are viewed from above Connect with insulating glue successively from bottom to bottom. The insulating glue has good insulating properties, can enhance the insulating function of the aging device 24, and is more in line with the working environment of insulating paper.

Further, the first copper tube 2, the second copper tube 5, and the third copper tube 8 are insulated from the corresponding first heating ring 3, the second heating ring 6, and the third heating ring 9 respectively. Glue connection, the insulating glue has good insulation, can enhance the insulation function of the aging device 24, and is more in line with the working environment of the insulating paper.

Further, the power supply 11 is a 12V DC power supply, and the 12V DC power supply is used to supply power to the parallel first heating ring 3, the second heating ring 6, and the third heating ring 9, which can increase heat production efficiency.

Further, a bracket is provided outside the experiment box 18 for supporting the whole experiment box 18 .

It can be known from the above technical solutions that the utility model provides a thermal aging experiment device for unevenly heating casing oil paper. Three sections were heated so that each section reached a different temperature, thus experimenting with non-uniform heating of the insulating paper wrapped outside the aging device. It can simulate the actual working environment of insulating paper in the transformer, so as to accurately analyze the aging degree of insulating paper in actual work.

The embodiments of the utility model described above do not constitute a limitation to the protection scope of the utility model.

Claims (7)

1. a kind of thermal ageing test device of non-uniform heat flux sleeve pipe oilpaper, it is characterised in that including：Power supply (11) and experimental box (18)；

Aging equipment (24) is provided with the experimental box (18) and the outside insulating paper (25) of the aging equipment (24) is wrapped in；

The aging equipment (24) includes the first fixation and covers (1), the first copper pipe (2), first thermal insulation layer (4), the second copper pipe (5), Second thermal insulation layer (7), the 3rd copper pipe (8), second fixes lid (10)；

The aging equipment (24) is fixed by first covers (1), the first copper pipe (2), first thermal insulation layer (4), the second copper pipe (5), the Two thermal insulation layers (7), the 3rd copper pipe (8) and the second fixation lid (10) are sequentially connected with form from top to bottom；

First copper pipe (2), the second copper pipe (5), the 3rd copper pipe (8) totally three copper pipes the upper bottom surface center of circle respectively be located at institute On the central axis for stating experimental box (18)；

First copper pipe (2) internal package has the first heating annulus (3)；

Second copper pipe (5) internal package has the second heating annulus (6)；

3rd copper pipe (8) internal package has the 3rd heating annulus (9)；

The power supply (11) heats annulus (6), the 3rd heating circle with the described first heating annulus (3), second respectively by wire Ring (9) is attached；

The experimental box (18) is built with insulating oil.

2. the thermal ageing test device of non-uniform heat flux sleeve pipe oilpaper according to claim 1, it is characterised in that including： Experimental box (18), the first flexible pipe (12), oil pump (13), the second flexible pipe (14), fuel tank (15), the 3rd flexible pipe (16) and control device (23)；

The experimental box (18) is connected by first flexible pipe (12) with the oil pump (13),

The oil pump (13) is connected by second flexible pipe (14) with the fuel tank (15),

The fuel tank (15) is connected by the 3rd flexible pipe (16) with the experimental box (18)；

Insulating oil and heater are provided with the fuel tank (15)；

The first temperature sensor (22), second temperature sensor (21), three-temperature sensor are provided with the experimental box (18) (20), the 4th temperature sensor (19)；

First temperature sensor (22) is arranged at the outside of first copper pipe (2)；

The second temperature sensor (21) is arranged at the outside of second copper pipe (5)；

The three-temperature sensor (20) is arranged at the outside of the 3rd copper pipe (8)；

4th temperature sensor (19) is arranged at the bottom of the experimental box (18)；

First temperature sensor (22), second temperature sensor (21), three-temperature sensor (20) and the 4th temperature are passed Sensor (19) is connected with control device (23) respectively.

3. the thermal ageing test device of non-uniform heat flux sleeve pipe oilpaper according to claim 1, it is characterised in that described One heating annulus (3), the second heating annulus (6), the 3rd heating annulus (9) is thermistor.

4. the thermal ageing test device of non-uniform heat flux sleeve pipe oilpaper according to claim 1, it is characterised in that described One fix lid (1), the first copper pipe (2), first thermal insulation layer (4), the second copper pipe (5), second thermal insulation layer (7), the 3rd copper pipe (8) and Second fixes lid (10) from top to bottom successively with insulation gemel connection.

5. the thermal ageing test device of non-uniform heat flux sleeve pipe oilpaper according to claim 1, it is characterised in that described One copper pipe (2), the second copper pipe (5), the 3rd copper pipe (8) and the corresponding first heating annulus (3), the second heating annulus (6), 3rd heating annulus (9) is respectively with insulation gemel connection.

6. the thermal ageing test device of non-uniform heat flux sleeve pipe oilpaper according to claim 1, it is characterised in that the electricity Source (11) is 12V dc sources.

7. the thermal ageing test device of non-uniform heat flux sleeve pipe oilpaper according to claim 1, it is characterised in that the reality Support (17) is provided with outside tryoff (18).