CN113625138B - Casing defect testing device and method - Google Patents

Abstract

The application discloses a sleeve defect test device and a sleeve defect test method, wherein the device comprises a test tank, a first wiring mechanism, a second wiring mechanism, a high-voltage electrode, a low-voltage electrode, an oilpaper insulation model and a temperature control mechanism; the test tank comprises a tank body and a tank cover; the high-voltage electrode is movably arranged in the test chamber along the direction close to or far from the high-voltage electrode, and a clamping gap for clamping the oilpaper insulation model is formed between the high-voltage electrode and the high-voltage electrode; a heating chamber is arranged in the high-voltage electrode; a fluid medium is arranged in the heating chamber; the temperature control mechanism is used for adjusting the temperature of the fluid medium in the heating cavity; the first wiring mechanism is arranged on the tank cover and is provided with an abutting part which can be contacted with the high-voltage electrode; the abutting part is provided with an elastic expansion amount; when the abutting part is in contact with the high-voltage electrode, the abutting part applies acting force to the high-voltage electrode along the direction of the high-voltage electrode towards the high-voltage electrode; the second wiring mechanism is connected with the low-voltage electrode. The simulation test of the defects of the oil paper insulating sleeve can be simply, quickly and flexibly realized.

Description

Casing defect testing device and method

Technical Field

The present application relates to the field of electric power technology, and in particular to a casing defect testing device and method.

Background technique

As the key channel for transformer and reactor output, the oil-paper insulation sleeve has the characteristics of large lead current and high voltage. Its safe operation is crucial to the stability of the power grid system. The bushing is one of the components with the highest defects or failures in the transformer. Studies have shown that the unplanned outages of 220kV and 500kV transformers caused by bushing failures account for about 25% of the total unplanned outages, and the unplanned outage time accounts for 56.5% of the total unplanned outage time. In order to master the insulation characteristics of the oil-paper insulation sleeve, it is necessary to simulate and study various defects of the bushing. However, the current bushing defect simulation test is complex, inefficient and has poor operational flexibility.

Summary of the invention

In view of this, the purpose of the present application is to provide a bushing defect testing device and method, which can simply, quickly and flexibly realize the oil-paper insulation bushing defect simulation test.

In order to achieve the above technical purpose, the present application provides a casing defect test device, including a test tank, a first wiring mechanism, a second wiring mechanism, a high-voltage electrode, a low-voltage electrode, an oil-paper insulation model and a temperature control mechanism;

The test tank comprises a tank body and a tank cover;

The tank cover is detachably mounted on the top of the tank body, and forms a test chamber between the tank cover and the tank body;

The low voltage electrode is fixedly mounted in the test chamber;

The high voltage electrode is movably installed in the test chamber in a direction close to or away from the low voltage electrode, and a clamping gap for clamping the oil-paper insulation model is formed between the high voltage electrode and the low voltage electrode;

A heating chamber is provided in the high voltage electrode;

The heating chamber is provided with a fluid medium;

The temperature control mechanism is used to adjust the temperature of at least one side of the high-voltage electrode in contact with the oil-paper insulation model by adjusting the temperature of the fluid medium in the heating chamber;

The first wiring mechanism is mounted on the tank cover and is provided with an abutment portion that can contact the high voltage electrode;

The abutment portion is provided with an elastic expansion amount;

When the abutting portion contacts the high-voltage electrode, the abutting portion applies a force on the high-voltage electrode in a direction from the high-voltage electrode toward the low-voltage electrode;

The second wiring mechanism is installed on the tank body and connected to the low-voltage electrode.

Furthermore, an oil filling valve communicating with the test chamber is connected to an upper end of one side surface of the tank body, and an oil extraction valve communicating with the test chamber is connected to a lower end of another side surface of the tank body;

The second wiring mechanism is a column structure and is installed at the bottom of the tank;

The low voltage electrode is softly connected to the second wiring mechanism;

The tank cover is connected with a one-way valve and a pressure gauge.

Furthermore, the first wiring mechanism includes an insulating sleeve, a guide rod, a top rod and an elastic member;

The insulating sleeve is covered on the outside of the guide rod, and the insulating sleeve is fixedly connected to the tank cover;

The guide rod is provided with an inner concave cavity at one end extending into the test chamber;

The push rod is slidably inserted into the inner concave cavity, and one end of the push rod extending out of the inner concave cavity forms the abutment portion;

The elastic member is installed in the inner concave cavity, one end of the elastic member is connected to the top of the inner concave cavity, and the other end is connected to the other end of the push rod extending into the inner concave cavity.

Furthermore, a sealing cover is provided at one end of the guide rod extending into the test chamber;

The sealing cover is provided with an avoidance hole for the ejector rod to movably pass through;

A limit screw with adjustable height along the axial direction of the push rod is provided on the rod section of the push rod located in the inner concave cavity;

The limiting screw contacts and abuts against the inner end surface of the sealing cover.

Furthermore, a first connecting portion is vertically provided at the other end of the push rod extending into the inner concave cavity;

The first connecting portion is connected to the elastic member;

A second connecting portion is provided at one end of the push rod extending out of the inner concave cavity;

The high voltage electrode is provided with a third connection portion which is nested with the second connection portion;

The first connecting portion is a crossbar structure, so that the top bar is T-shaped;

The second connecting portion is a spherical structure;

The third connection part is a columnar structure, and a circular arc notch is provided on the top for the second connection part to be movably embedded.

Furthermore, the elastic member is a spring.

Furthermore, an insulating fixing cylinder is installed at the bottom of the test chamber;

The middle part of the fixing cylinder is provided with an installation cavity;

The fixing cylinder is provided with a plurality of connecting holes connecting the installation cavity and the test chamber;

A support bar is provided near the bottom of the inner wall of the installation cavity;

The low voltage electrode is mounted on the support bar;

The high-voltage electrode is movably mounted in the mounting cavity and is located above the low-voltage electrode;

The oil-paper insulation model is installed in the installation cavity and is located between the high-voltage electrode and the low-voltage electrode.

Furthermore, the oil-paper insulation model is formed by alternating multiple layers of insulation paper and multiple layers of aluminum foil.

Furthermore, the temperature control mechanism includes a circulation pump and a heater;

The inlet of the circulation pump is connected to the heating chamber through a first delivery pipe, and the outlet of the circulation pump is connected to the inlet of the heater through a second delivery pipe;

The outlet of the heater is communicated with the heating chamber through a third delivery pipe.

The present application also discloses a casing defect test method, which is applied to a casing defect test device, comprising:

preparing an oil-paper insulation model;

Installing the prepared oil-paper insulation model between the high-voltage electrode and the low-voltage electrode, and connecting the high-voltage electrode to a temperature control mechanism;

Install the tank cover so that the abutment portion of the first wiring mechanism contacts the high voltage motor;

Evacuate the test tank;

Inject insulating oil into the test tank and let it stand for a preset time;

Connecting the high voltage electrode and the low voltage electrode to the voltage output terminal and the current input terminal of a dielectric loss test device respectively;

The temperature control mechanism is started, and when the high voltage electrode is controlled to be stable at a preset temperature by the temperature control mechanism, the dielectric loss test device is started to perform the test.

It can be seen from the above technical solutions that the bushing defect test device provided by the present application, in which the oil-paper insulation model is used to simulate the capacitor core of the bushing, and the high-voltage electrode and the low-voltage electrode are used to flexibly form a simulated bushing. Moreover, by providing a heating chamber in the high-voltage electrode, and providing a fluid medium in the heating chamber, and then controlling the fluid medium through the temperature control mechanism, the temperature of the high-voltage electrode is controlled, so that the temperature inside the actual running bushing can be simply and quickly simulated. At the same time, the first wiring mechanism is provided with an abutment portion that can be electrically connected to the high-voltage electrode and has an elastic expansion amount, so that when the abutment portion contacts the high-voltage electrode, it can apply a force to the high-voltage electrode in the direction of the high-voltage electrode toward the low-voltage electrode, thereby compacting the oil-paper insulation model, and making the electrical connection between the first wiring mechanism and the high-voltage electrode more stable, thereby improving the reliability of the simulation test.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

FIG1 is a schematic diagram of the overall structure of a casing defect testing device provided in the present application;

FIG2 is a cross-sectional view of a fixing tube of a casing defect testing device provided in the present application;

FIG3 is a schematic diagram of an oil-paper insulation model of a bushing defect test device provided in the present application;

FIG4 is a schematic diagram of a high voltage electrode of a casing defect test device provided in the present application;

FIG5 is a schematic diagram of a process flow of a casing defect test method provided in the present application;

In the figure: 1. test tank; 11. tank body; 111. oil filling valve; 112. oil extraction valve; 113. second wiring mechanism; 12. tank cover; 121. one-way valve; 122. pressure gauge; 13. fastening bolt; 2. first wiring mechanism; 21. insulating sleeve; 22. guide rod; 23. elastic member; 24. push rod; 241. first connecting part; 242. second connecting part; 25. sealing cover; 26. limit screw; 31. high voltage electrode; 311. third connecting part; 312. notch; 32. low voltage electrode; 321. metal soft connection; 33. oil-paper insulation model; 331. insulation paper; 332. aluminum foil; 4. temperature control mechanism; 41. circulation pump; 42. heater; 43. first delivery pipe; 44. second delivery pipe; 45. third delivery pipe; 5. fixing cylinder; 51. mounting frame; 52. support bar; 53. connecting hole.

Detailed ways

The technical solutions of the embodiments of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, not all of them. All other embodiments obtained by ordinary technicians in this field without creative work based on the embodiments in the embodiments of the present application are within the scope of protection of the embodiments of the present application.

In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a replaceable connection, or an integral connection, a mechanical connection, or an electrical connection, a direct connection, or an indirect connection through an intermediate medium, or the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

The embodiments of the present application disclose a casing defect testing device and method.

Please refer to FIG1 . An embodiment of a casing defect testing device provided in the embodiment of the present application includes:

Test tank 1 , first wiring mechanism 2 , second wiring mechanism 113 , high voltage electrode 31 , low voltage electrode 32 , oil-paper insulation model 33 and temperature control mechanism 4 .

The test tank 1 comprises a tank body 11 and a tank cover 12. The tank cover 12 is detachably mounted on the top of the tank body 11, and forms a test chamber with the tank body 11. The tank cover 12 can be connected to the tank body 11 by fastening bolts 13, and a sealing ring can be provided between the tank cover 12 and the tank body 11 to improve the sealing performance of the connection.

The low-voltage electrode 32 is fixedly installed in the test chamber, and the high-voltage electrode 31 is also movably installed in the test chamber in a direction close to or away from the low-voltage electrode 32, and a clamping gap for clamping the oil-paper insulation model 33 is formed between the high-voltage electrode 31 and the low-voltage electrode 32. The purpose of the movable installation of the high-voltage electrode 31 is to facilitate the installation of the oil-paper insulation model 33. For example, after taking out the high-voltage electrode 31, insert the oil-paper insulation model 33, and then put the high-voltage electrode 31 back, the installation of the oil-paper insulation model 33 can be completed. The movable installation method of the high-voltage electrode 31 can be designed according to actual needs without limitation.

In order to simply and quickly simulate the temperature inside the actual operating bushing, a heating chamber is provided in the high-voltage electrode 31, and a fluid medium is provided in the heating chamber. The temperature control mechanism 4 is used to adjust the temperature of at least one side of the high-voltage electrode 31 that contacts the oil-paper insulation model 33 by adjusting the temperature of the fluid medium in the heating chamber.

As for the first connection mechanism 2, it is installed on the tank cover 12 and is provided with a contact portion that can contact the high-voltage electrode 31. The contact portion is provided with an elastic expansion amount, and when the contact portion contacts the high-voltage electrode 31, the contact portion applies a force to the high-voltage electrode 31 in the direction from the high-voltage electrode 31 to the low-voltage electrode 32.

The second wiring mechanism 113 is installed on the tank body 11 and connected to the low-voltage electrode 32 .

It can be seen from the above technical solutions that the bushing defect test device provided by the present application, wherein the oil-paper insulation model 33 is used to simulate the capacitor core of the bushing, and is matched with the high-voltage electrode 31 and the low-voltage electrode 32 to flexibly form a simulated bushing. Moreover, by providing a heating chamber in the high-voltage electrode 31, and providing a fluid medium in the heating chamber, and then controlling the fluid medium through the temperature control mechanism 4, the temperature of the high-voltage electrode 31 is controlled, so that the temperature inside the actual running bushing can be simply and quickly simulated. At the same time, the first wiring mechanism 2 is provided with an abutting portion that can contact with the high-voltage electrode 31 and has an elastic expansion amount, so that when the abutting portion contacts the high-voltage electrode 31, it can apply a force to the high-voltage electrode 31 in the direction of the high-voltage electrode 31 toward the low-voltage electrode 32, thereby compacting the oil-paper insulation model 33, and making the electrical connection between the first wiring mechanism 2 and the high-voltage electrode 31 more stable, thereby improving the reliability of the simulation test.

The above is Example 1 of a casing defect testing device provided in an embodiment of the present application. The following is Example 2 of a casing defect testing device provided in an embodiment of the present application. Please refer to Figures 1 to 4 for details.

Based on the solution of the above embodiment 1:

Furthermore, an oil filling valve 111 connected to the test chamber is connected to the upper end of one side surface of the tank body 11, which is convenient for injecting insulating oil into the test chamber. An oil extraction valve 112 connected to the test chamber is connected to the lower end of the other side surface of the tank body 11, which is convenient for discharging the insulating oil in the test chamber after the test is completed. Of course, in addition to this installation position, other installation positions can also be used, such as the oil filling valve 111 connected to the tank cover 12, the oil extraction valve 112 connected to the bottom of the tank body 11, etc., which are not specifically limited.

The second wiring mechanism 113 is a wiring post structure, which is installed at the bottom of the tank body 11 . In order to facilitate the wiring of the low-voltage electrode 32 , the low-voltage electrode 32 is softly connected to the second wiring mechanism 113 .

The tank cover 12 is connected to a one-way valve 121 and a pressure gauge 122, wherein the connected one-way valve 121 plays two roles: first, the one-way valve 121 can be connected to an external vacuum machine, so as to facilitate vacuuming the tank body 11 before filling it with oil; second, during the test, when the temperature in the tank body 11 rises and the pressure increases, the expanded gas and insulating oil in the tank can be discharged through the one-way valve 121 to relieve pressure. The pressure gauge 122 can be used to indicate the pressure inside the tank body 11 for easy monitoring. The tank body 11 and the tank cover 12 in the present application can both be made of metal materials with good structural strength. Of course, they can also be made of other materials without specific restrictions.

Furthermore, the first wiring mechanism 2 comprises an insulating sleeve 21 , a guide rod 22 , a top rod 24 and an elastic member 23 .

The insulating sleeve 21 is wrapped around the guide rod 22, and the insulating sleeve 21 is fixedly connected to the tank cover 12. The insulating sleeve 21 mainly plays the role of insulation and sealing, and can be embedded and fixed in the middle of the tank cover 12 without limitation.

The guide rod 22 is provided with an inner concave cavity at one end extending into the test chamber, and the push rod 24 is slidably inserted into the inner concave cavity, and one end of the push rod 24 extending out of the inner concave cavity forms an abutment portion. The elastic member 23 is installed in the inner concave cavity, and one end of the elastic member 23 is connected to the top of the inner concave cavity, and the other end is connected to the other end of the push rod 24 extending into the inner concave cavity. That is, through the elastic member 23, the push rod 24 has an elastic expansion amount, can be elastically expanded and contracted, and then the abutment portion has an elastic expansion amount. Among them, the push rod 24 can be limited along the axial direction of the guide rod 22 by the elastic member 23, that is, the two ends of the elastic member 23 are respectively fixedly connected. In this way, the axial limiting connection of the push rod 24 can be achieved through the elastic member 23 to prevent the push rod 24 from falling out. In addition, it should be noted that the guide rod 22 and the top rod 24 are both made of conductive materials, and electrical conduction can be transmitted between the two through the elastic member 23. The top rod 24 achieves electrical conduction through sliding contact with the inner concave cavity wall. There are no specific restrictions, and it is sufficient to ensure that the high-voltage electrode 31 can be powered normally through the guide rod 22 and the top rod 24.

Furthermore, a sealing cover 25 may be provided at one end of the guide rod 22 extending into the test chamber, and the sealing cover 25 may be provided with an avoidance hole for the push rod 24 to pass through. A limit screw 26 with adjustable height along the axial direction of the push rod 24 may be provided on the rod section of the push rod 24 located in the inner concave cavity, and the limit screw 26 may contact and abut against the inner end surface of the sealing cover 25. That is, the axial limit of the push rod 24 is achieved through the cooperation between the limit screw 26 and the sealing cover 25 to prevent the push rod 24 from coming out. In this cooperation mode, the two ends of the elastic member 23 do not need to be fixedly connected. To achieve the adjustability of the limit screw 26, a plurality of screw holes with spacing distribution may be provided on the push rod 24 along its own axial direction, so that the height of the limit screw 26 can be adjusted by fixing the limit screw 26 to the screw holes at different positions, and there is no specific restriction. By adjusting the height of the limit screw 26, the extension amount of the push rod 24 can be controlled, so as to adapt to simulation tests of more casing types.

Furthermore, a first connecting portion 241 is vertically provided at the other end of the top rod 24 extending into the inner concave cavity, and the first connecting portion 241 is connected to the elastic member 23. A second connecting portion 242 is provided at one end of the top rod 24 extending out of the inner concave cavity, and a third connecting portion 311 is provided on the high-voltage electrode 31, which is nested with the second connecting portion 242.

Specifically, the first connecting portion 241 may be a crossbar structure so that the top rod 24 is T-shaped, the second connecting portion 242 may be a spherical structure, and the third connecting portion 311 may be a columnar structure, and a circular arc notch 312 is provided on the top for the second connecting portion 242 to be movably embedded. Of course, the above-mentioned means are not limited thereto, and those skilled in the art may also make appropriate adjustments and changes based on this.

Furthermore, the elastic member 23 is specifically a spring.

Furthermore, an insulating fixing tube 5 is installed at the bottom of the test chamber, and specifically can be installed at the center of the bottom of the test chamber. The bottom of the fixing tube 5 is detachably fixed to the bottom of the test chamber through a corresponding mounting frame 51 .

In order to facilitate the installation of the low-voltage electrode 32, the high-voltage electrode 31 and the oil-paper insulation model 33, an installation cavity is provided in the middle of the fixed cylinder 5, and a plurality of connecting holes 53 connecting the installation cavity and the test chamber are opened on the fixed cylinder 5, so that the insulating oil can penetrate into the installation cavity through the connecting holes 53.

A support bar 52 is provided near the bottom of the inner wall of the installation cavity, the low-voltage electrode 32 is installed on the support bar 52, the high-voltage electrode 31 is movably installed in the installation cavity and is located above the low-voltage electrode 32, and the oil-paper insulation model 33 is installed in the installation cavity and is located between the high-voltage electrode 31 and the low-voltage electrode 32. Taking this installation and fixing structure as an example, the low-voltage electrode 32 is installed on the support bar 52, and the second wiring mechanism 113 at the bottom of the tank body 11 can be connected through the metal soft connection 321, so that the electrical signal of the low-voltage electrode 32 is led out of the tank body 11. After the low-voltage electrode 32 is installed, the oil-paper insulation model 33 and the high-voltage electrode 31 are placed on the low-voltage electrode 32, and finally the tank cover 12 is installed, and the high-voltage electrode 31 is supported by the elastically retractable top rod 24, so that the high-voltage electrode 31 and the low-voltage electrode 32 clamp the oil-paper insulation model 33. The electrical signal of the high-voltage electrode 31 is introduced into the tank body 11 through the guide rod 22 and the top rod 24.

Furthermore, the oil-paper insulation model 33 is formed by alternating multiple layers of insulation paper 331 and multiple layers of aluminum foil 332, wherein the thickness of the insulation sublayer can be adjusted according to actual research needs, and there is no specific limitation.

Further, the temperature control mechanism 4 includes a circulation pump 41 and a heater 42. The inlet of the circulation pump 41 is connected to the heating chamber through a first delivery pipe 43, and the first delivery pipe 43 is specifically connected to the top of the high-voltage electrode 31. The outlet of the circulation pump 41 is connected to the inlet of the heater 42 through a second delivery pipe 44; the outlet of the heater 42 is connected to the heating chamber through a third delivery pipe 45, and the third delivery pipe 45 is also connected to the top of the high-voltage electrode 31 and extends downward to the bottom of the heating chamber. The heating control is as follows: the fluid medium in the heating chamber is extracted by the circulation pump 41, and then heated by the heater 42, and then sent back to the heating chamber after heating, so as to realize the continuous heat exchange of the fluid medium in the heating chamber, thereby realizing the control of the temperature of the fluid medium in the heating chamber. Specifically, the temperature of the fluid medium in the heating chamber can be judged by monitoring the temperature of the fluid medium on the first delivery pipe 43, so as to achieve better temperature control. For example, when the temperature of the fluid medium in the first delivery pipe 43 is detected to be a preset temperature for a certain period of time, it can be determined that the high-voltage electrode 31 has reached the preset temperature. Of course, other temperature control determination methods can also be used, and there is no specific limitation. The heater 42 may be an electric heater 42 , the fluid medium may be oil, and the circulation pump 41 may be an oil pump.

As shown in FIG5 , the present application further discloses a casing defect test method, which is applied to the casing defect test device of the above embodiment, and comprises the following steps:

S1, prepare the oil-paper insulation model 33. Specifically, cut the insulation paper 331 and the aluminum foil 332 with the same diameter as the inner diameter of the fixed tube 5. The insulation paper 331 can be, for example, 6 layers, and the thickness of each layer is, for example, 5 mm. Put the insulation paper 331 and the aluminum foil 332 into a constant temperature drying oven for 72 hours or other preset time to dry.

After being fully dried, one of the insulating layers is placed in open air to simulate natural moisture, and the weight before and after moisture is recorded using a balance scale. Then, the insulating paper 331 and the aluminum foil 332 are stacked alternately to form an oil-paper insulation model 33.

S2, install the prepared oil-paper insulation model 33 between the high-voltage electrode 31 and the low-voltage electrode 32, and connect the high-voltage electrode 31 to the temperature control mechanism 4. Specifically, place the oil-paper insulation model 33 on the low-voltage electrode 32 in the fixed cylinder 5, and then install the high-voltage electrode 31. After the high-voltage electrode 31 is installed, the high-voltage electrode 31 is respectively connected to the temperature control mechanism 4, and the temperature control mechanism 4 is connected to the inlet of the heating chamber, that is, the inlet of the circulating pump 41 is connected to the heating chamber through the first delivery pipe 43, and the outlet of the heater 42 is connected to the heating chamber through the third delivery pipe 45.

S3, installing the tank cover 12 so that the abutting portion of the first wiring mechanism 2 contacts the high voltage motor. Specifically, by installing the tank cover 12, the second connecting portion 242 of the push rod 24 can contact the third connecting portion 311 of the high voltage electrode 31.

S4, evacuate the test tank 1. Close the oil filling valve 111 and the oil extraction valve 112 connected to the tank body 11, and connect the vacuum machine to the one-way valve 121. Start the vacuum machine to evacuate the tank body 11. During the evacuation process, observe the pressure gauge 122, and stop evacuating when the air pressure drops to a preset air pressure, such as 1 kPa.

S5, inject insulating oil into the test tank 1 and let it stand for a preset time. Specifically, connect the insulating oil barrel to the oil filling valve 111, open the oil filling valve 111 to inject insulating oil into the test tube, and let it stand for, for example, 2 hours after the insulating oil is filled.

S6, connect the high voltage electrode 31 and the low voltage electrode 32 to the voltage output terminal and the current input terminal of the dielectric loss test device respectively. Specifically, connect the end of the guide rod 22 of the first wiring mechanism 2 extending out of the test chamber to the voltage output terminal of the dielectric loss test device, and connect the second wiring mechanism 113 to the current input terminal of the dielectric loss test device.

S7, start the temperature control mechanism 4, and when the high-voltage electrode 31 is controlled to be stable at a preset temperature by the temperature control mechanism 4, start the dielectric loss test device for testing. Specifically, the temperature control mechanism 4 can be started after the wiring is completed, and when the temperature of the high-voltage electrode 31 reaches the preset temperature, the dielectric loss test device can be started to test the dielectric loss value of the insulating oil paper model at a specific temperature.

This test method can realize dielectric loss of different insulation layers and different moisture levels at different temperatures by changing the oil-paper insulation model 33 and temperature made in S1, thereby realizing more diversified tests.

The above is a detailed introduction to a casing defect testing device and method provided in the present application. For a person skilled in the art, according to the idea of the embodiments of the present application, there may be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as limiting the present application.

Claims (8)

1. The sleeve defect test device is characterized by comprising a test tank, a first wiring mechanism, a second wiring mechanism, a high-voltage electrode, a low-voltage electrode, an oilpaper insulation model and a temperature control mechanism;

the test tank comprises a tank body and a tank cover;

The tank cover is detachably covered on the top of the tank body, and a test chamber is formed between the tank cover and the tank body;

The low-voltage electrode is fixedly arranged in the test chamber;

the high-voltage electrode is movably arranged in the test chamber along the direction close to or far from the high-voltage electrode, and a clamping gap for clamping the oilpaper insulation model is formed between the high-voltage electrode and the high-voltage electrode;

The oil paper insulation model is used for simulating a capacitor core of the sleeve, and the oil paper insulation model is matched with the high-voltage electrode and the high-voltage electrode to flexibly form the simulated sleeve;

A heating chamber is arranged in the high-voltage electrode;

a fluid medium is arranged in the heating cavity;

the temperature control mechanism is used for adjusting the temperature of the fluid medium in the heating cavity so as to adjust the temperature of at least one surface of the high-voltage electrode, which is in contact with the oilpaper insulation model;

the first wiring mechanism is arranged on the tank cover and is provided with an abutting part which can be contacted with the high-voltage electrode;

the abutting part is provided with an elastic expansion amount;

when the abutting part is in contact with the high-voltage electrode, the abutting part applies an acting force to the high-voltage electrode along the direction of the high-voltage electrode towards the low-voltage electrode;

The second wiring mechanism is arranged on the tank body and is connected with the low-voltage electrode;

the first wiring mechanism comprises an insulating sleeve, a guide rod, an ejector rod and an elastic piece;

The insulation sleeve is coated outside the guide rod and is fixedly connected with the tank cover;

one end of the guide rod extending into the test chamber is provided with an inner concave cavity;

The ejector rod is inserted into the inner concave cavity in a sliding manner, and one end part of the ejector rod, which extends out of the inner concave cavity, forms the abutting part;

the elastic piece is arranged in the inner concave cavity, one end of the elastic piece is connected with the top of the inner concave cavity, and the other end of the elastic piece is connected with the other end of the ejector rod extending into the inner concave cavity;

The other end of the ejector rod extending into the inner concave cavity is vertically provided with a first connecting part;

The first connecting part is connected with the elastic piece;

The end of the ejector rod extending out of the inner concave cavity is provided with a second connecting part;

a third connecting part which is nested and matched with the second connecting part is arranged on the high-voltage electrode;

The first connecting part is of a cross rod structure, so that the ejector rod is of a T shape;

The second connecting part is of a spherical structure;

the third connecting part is of a columnar structure, and the top of the third connecting part is provided with an arc notch for the second connecting part to be movably embedded.

2. The sleeve defect testing device according to claim 1, wherein an oil filling valve communicated with the testing chamber is connected to the upper end position of one side surface of the tank body, and an oil taking valve communicated with the testing chamber is connected to the lower end position of the other side surface of the tank body;

The second wiring mechanism is of a column structure and is arranged at the bottom of the tank body;

the low-voltage electrode is in flexible connection with the second wiring mechanism;

The tank cover is connected with a one-way valve and a pressure gauge.

3. The sleeve defect testing device according to claim 1, wherein a sealing cover is arranged at one end of the guide rod extending into the testing chamber;

The sealing cover is provided with an avoidance hole for the ejector rod to movably pass through;

a limit screw with adjustable height along the axial direction of the ejector rod is arranged on the rod section of the ejector rod in the inner concave cavity;

the limit screw is contacted and abutted with the inner end surface of the sealing cover.

4. A casing defect testing device according to claim 1, wherein the resilient member is a spring.

5. The sleeve defect testing device according to claim 1, wherein an insulating fixed cylinder is arranged at the bottom of the testing chamber;

The middle part of the fixed cylinder is provided with a mounting through cavity;

the fixed cylinder is provided with a plurality of communication holes which are communicated with the mounting through cavity and the test cavity;

a support bar is arranged on the inner wall of the mounting through cavity near the bottom;

The low-voltage electrode is arranged on the supporting bar;

The high-voltage electrode is movably arranged in the mounting through cavity and is positioned above the high-voltage electrode;

the oilpaper insulation model is installed in the installation through cavity and is located between the high-voltage electrode and the high-voltage electrode.

6. The sleeve defect testing device according to claim 1, wherein the oiled paper insulation model is formed by overlapping a plurality of layers of insulation paper and a plurality of layers of aluminum foils.

7. The casing defect testing device of claim 1, wherein the temperature control mechanism comprises a circulation pump and a heater;

The inlet of the circulating pump is communicated with the heating chamber through a first conveying pipe, and the outlet of the circulating pump is communicated with the inlet of the heater through a second conveying pipe;

the outlet of the heater is communicated with the heating chamber through a third conveying pipe.

8. A casing defect testing method, characterized by being applied to the casing defect testing device as claimed in any one of claims 1 to 7, comprising:

preparing an oilpaper insulation model;

Installing the prepared oilpaper insulation model between a high-voltage electrode and a high-voltage electrode, and connecting the high-voltage electrode with a temperature control mechanism;

Mounting the can lid such that the abutment of the first wiring mechanism is in contact with the high voltage motor;

Vacuumizing the test tank;

Injecting insulating oil into the test tank and standing for a preset time;

connecting the high-voltage electrode and the low-voltage electrode to a voltage output end and a current input end of a dielectric loss testing device respectively;

And starting a temperature control mechanism, and starting the dielectric loss testing device to test when the high-voltage electrode is controlled to be stabilized at a preset temperature by the temperature control mechanism.