CN111077423A - Device and method for testing dielectric property of solid insulating material interface - Google Patents
Device and method for testing dielectric property of solid insulating material interface Download PDFInfo
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- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
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- G—PHYSICS
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Abstract
The invention discloses a device and a method for testing dielectric property of a solid insulating material interface, wherein the device comprises a pressure regulating device, an insulating assembly and an electrode assembly; the pressure regulating device regulates and controls the pressure by controlling the fastening degree of the nut on the bolt column and matching with the high-strength spring, so as to provide pressure for the solid material at the interface. The insulating assembly ensures the insulating property between the electrode assembly and the pressure regulating device. The electrode assembly tightly attaches the electrode to the material interface by means of bolt fastening. During testing, the device is located in an oven. The invention can effectively inhibit the leakage current on the non-interface side of the material, displays the pressure readings in real time, has small volume, simple test method and convenient operation, and can test the dielectric properties of the solid insulating material interface under different pressures and different temperatures.
Description
Technical Field
The invention belongs to the technical field of high voltage and insulation, and particularly relates to a device and a method for testing dielectric property of an interface of a solid insulating material.
Background
The power industry is the basic industry of national economic development and industrialization, and along with the continuous acceleration of the urbanization process and the continuous and rapid development of economy in China, the power consumption demand is increasingly increased sharply. In order to effectively reduce the consumption of fossil energy and reduce environmental pollution, a power system is being greatly changed in the future, renewable energy sources such as solar energy, wind energy and the like become main power sources in a centralized way and a distributed way, and meanwhile, with the increasing demand of offshore wind power and island power supply, a power cable becomes one of key power equipment for building urban underground energy comprehensive channels and realizing long-distance large-capacity power transmission and large-scale utilization of new energy power. Along with the rapid development of beach wind power plants and offshore wind power plants in recent years, the investment and construction of a large number of offshore wind power projects and the number of laid and put into operation of submarine cables are rapidly increased. Statistics shows that the length of the high-voltage submarine cable with the voltage class of more than 110kV in China already exceeds 2000 km. In a submarine cable transmission line with large length, the reliability of a cable joint is a key influencing the safe and stable operation of the whole cable system. Particularly, with the use of a high-voltage large-capacity direct-current transmission system, a cable joint technology under direct-current voltage becomes a bottleneck in the development of a large-length large-capacity high-voltage cable system, so that the research on the joint technology of the cable is a key for developing the transmission of a large-length large-capacity high-voltage direct-current cable.
The cable joint has the advantages that the circuit is continuous, the cable keeps sealed, the insulation grade of the joint is guaranteed, all sections of the cable are connected into a whole, and safe and reliable operation of the cable joint is guaranteed. Due to the existence of a solid interface at the cable joint, the solid interface becomes the weakest link of insulation in a cable system. The contact of insulating materials of different types and different dielectric properties forms a solid-solid interface, because the electric field distribution at the material interface is uneven, the field intensity distortion exists, the insulating strength of the solid interface is far lower than that of a cable insulating body, and the installation of a field joint is usually carried out under the conditions of a non-clean room and an uncontrollable environment, so that tiny defects (such as air gaps, dust, pollutants and other impurities) are easily formed at the joint interface, and the insulation fault occurs.
At present, for the research of the interface problem of the cable joint, a flat electrode is designed by Emre Kantar and the like, pressure is provided by a heavy object, the whole electrode is immersed in transformer oil, the breakdown characteristic of the interface under different roughness and pressure is researched, but no temperature related research exists, the size of a testing device is large, when the pressure reaches 1.16MPa, the required heavy object reaches 26kg, if the pressure is increased again, the operation is relatively difficult, and certain safety risk exists. Zhu et al changed the shape of the test material, adopted the cake-type material, put the thin slice ring electrode between two materials, studied the interface characteristic under different roughness and pressure, but did not involve the relevant study of the temperature either, and the cake-type material is bulky in this design, introduced the electrode material of certain thickness in the interface, the test result is not the real effective material interface characteristic. Therefore, a simple and practical testing device and method capable of researching the interface dielectric properties of solid insulating materials with different roughness under different temperatures and pressures are needed.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a device and a method for testing the dielectric property of the solid insulating material interface aiming at the interface problem of the cable joint, and the dielectric property of the solid insulating material interface under different conditions is researched by adjusting the pressure of the interface dielectric property testing device and the temperature in an oven.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention firstly discloses a device for testing the dielectric property of a solid insulating material interface, which comprises the following steps: the device comprises a pressure regulation and control device, an insulation component, a material interface to be detected and an electrode component;
the electrode assembly comprises a positive electrode and a negative electrode, and the interface of the material to be detected is formed by the vertical clinging of the No. 1 material and the No. 2 material; the shape of the material No. 1 is completely the same as that of the material No. 2, holes which are used for containing negative electrodes and have the same shape and size with the negative electrodes are formed in the centers of the material No. 1 and the material No. 2, and the negative electrodes are located in the holes and tightly attached to the inner portions of the joints of the interfaces of the materials to be detected; the positive electrode is tightly attached to and surrounds the outside of the joint of the interface of the material to be detected;
the insulation assembly comprises an upper insulation shielding plate, a lower insulation shielding plate, a positive electrode insulation backing plate and a negative electrode insulation backing plate;
the positive electrode insulating backing plate is positioned at the lower part of the positive electrode and used for supporting and adjusting the height of the positive electrode; the negative electrode insulating backing plate is positioned at the lower part of the negative electrode and is used for supporting and adjusting the height of the negative electrode;
the material interface to be tested, the electrode assembly, the positive electrode insulating base plate and the negative electrode insulating base plate are all positioned between the upper insulating shielding plate and the lower insulating shielding plate;
the pressure regulation and control device is used for regulating the pressure between the No. 1 material and the No. 2 material.
As a preferred scheme of the invention, the pressure regulation and control device comprises a stress flat plate, a stress bolt, a bolt column, a pressure sensor, a pressure display, a sensor supporting plate, a spring supporting plate and a base; the stressed bolt is fixed in the middle of the stressed flat plate through a nut; the bolt column penetrates through the stressed flat plate, the sensor supporting plate, the spring supporting plate and the base respectively; the pressure sensor is connected with the pressure display; two ends of the spring are respectively contacted with the sensor supporting plate and the spring supporting plate; the tail end of the bolt column penetrating through the base is fixed with the base by adopting a nut; the bottom of the stress bolt is in contact with the pressure sensor; the pressure sensor is fixed on the sensor supporting plate.
As the preferred scheme of the invention, the lower surface of the spring supporting plate is provided with a bulge; the upper surface of the base is provided with a bulge; a hole is formed in the center of the upper insulating shielding plate and is connected with the bulge on the lower surface of the spring supporting plate in a matched manner through the hole; a hole is formed in the center of the lower insulating shielding plate and is connected with the bulge on the upper surface of the base in a matched manner through the hole; the positive electrode insulating base plate is arranged between the lower insulating shielding plate and the positive electrode, and the negative electrode insulating base plate is positioned at the upper end of the base protrusion.
As the preferred scheme of the invention, the height of the bulge on the lower surface of the spring supporting plate is greater than the thickness of the upper insulating shielding plate, and the end part of the bulge is tightly attached to the top of the negative electrode; the height of the bulge on the upper surface of the base is larger than the thickness of the lower insulating shielding plate, the top of the bulge is tightly attached to the bottom of the negative electrode insulating base plate, and the top of the negative electrode insulating base plate is tightly attached to the negative electrode.
As a preferable scheme of the invention, the positive electrode is tightly attached to and surrounds the outside of the interface of the material to be measured and consists of two parts, the two parts are connected through a bolt to be matched with the outside of the interface of the material to be measured, and the fastening degree of the two parts is adjustable.
As a preferable scheme of the invention, the No. 1 material and the No. 2 material are in the shape of circular ring-shaped sheets; the positive electrode is annular and surrounds the periphery of the annular slice; the negative electrode is circular, and the diameter of the negative electrode is the same as that of the circular hole in the circular thin slice; the spring supporting plate and the protrusions on the base are hollow cylinders, the outer diameter of each hollow cylinder is the same as the diameter of a round hole in the circular ring-shaped slice, and the holes in the upper insulating shielding plate and the lower insulating shielding plate are round holes with the same diameter as the diameter of the round hole in the circular ring-shaped slice.
The invention also discloses a test method of the device for testing the dielectric property of the solid insulating material interface, which comprises the following steps
Step 1: preparing a material No. 1 to be tested and a material No. 2 to be tested according to actual test requirements, wherein the materials are the same in size;
step 2: calculating the contact area of the material interface according to the geometric structure of the material interface;
and step 3: according to the actual test pressure requirement, the pressure required to be provided by the interface dielectric property test device is calculated, and the calculation formula is as follows:
N＝P*S-G
in the formula, P is testing pressure, S is material interface contact area, and G is the sum of self gravity of a stressed flat plate, a pressure sensor, a sensor supporting plate, a high-strength compression spring, a spring flat plate and an upper insulation shielding plate;
and 4, step 4: mounting insulation assembly
Connecting the upper and lower insulating shielding plates with the spring supporting plate and the base bulge respectively in a matching manner; adjusting the height positions of the positive electrode and the negative electrode by increasing or decreasing the quantity of the positive electrode insulating base plate and the negative electrode insulating base plate;
and 5: installation sample
Installing the No. 1 and No. 2 materials to be detected in the middle of the base, enabling the inner holes of the materials to be nested on the bulges of the base, and enabling the No. 1 material to be in contact with the No. 2 material to form an interface to be detected;
step 6: mounting electrode assembly
The positive electrode is arranged outside the interface of the No. 1 material and the No. 2 material to be detected, the position of the positive electrode is adjusted to be attached to the joint of the materials, the negative electrode is arranged inside the interface of the No. 1 material and the No. 2 material to be detected, and the position of the negative electrode is adjusted to be attached to the joint of the materials;
and 7: installing a pressure regulating device;
and 8: set pressure
Adjusting the fastening degree of the stressed bolt and the nut on the bolt column to enable the reading of the pressure sensor to be N;
and step 9: setting the temperature of the oven and connecting an external circuit
Placing the interface testing device in an oven, and positioning a pressure display outside the oven; connecting the positive electrode and the negative electrode with external test equipment through cables, closing a box door, setting a test temperature, and opening an oven to enable the temperature to reach a set value;
step 10: testing
The spring supporting plate and the base are grounded through a reserved interface; and setting parameters of external test equipment according to the test requirements, starting the test and acquiring a test data result.
The test equipment comprises a dielectric loss tester, a conductivity tester, a partial discharge tester, a breakdown tester, a lightning impulse voltage generator and an operation impulse voltage generator.
Compared with the prior art, the invention has the following beneficial technical effects: the whole device provided by the invention adopts a brand-new structural design, can effectively inhibit leakage current on the non-interface side of the insulating material through being grounded with the testing equipment, and does not need to be immersed in transformer oil to improve the insulation. The nut and the stressed flat plate are fastened to provide required pressure for a material interface, a heavy object is not needed for applying pressure, pressure readings are displayed in real time, and the method is more visual and reliable. The whole testing device is arranged in the oven, and the temperature is stable and adjustable. The solid material interface testing device is small in size, good in insulation shielding effect, simple in testing method and convenient to operate, and provides an effective means for researching dielectric properties of the material interface under different pressures and different temperatures.
Drawings
FIG. 1 is a schematic structural diagram of an interface testing apparatus according to the present invention.
FIG. 2 is a schematic view of the structure of the insulating assembly and electrode assembly of the present invention in conjunction with a pressure regulating device;
FIG. 3 is a schematic view of the structure of the insulating assembly and electrode assembly of the present invention
Fig. 4 is a schematic top view of an electrode assembly structure in an embodiment of the invention.
FIG. 5 is a flow chart of the interface testing apparatus according to the present invention.
FIG. 6 is a waveform of a test for interfacial conductivity according to the present invention.
FIG. 7 is a waveform of a partial discharge test of a test interface according to the present invention.
Detailed Description
Referring to fig. 1-4, the present invention is a device for testing dielectric properties of an interface of a solid insulating material, including a pressure control device, an insulating assembly and an electrode assembly. During operation, the pressure regulating device, the insulating assembly and the electrode assembly are located inside the oven, the pressure display, the power supply equipment and the measuring equipment are located outside the oven, and the external equipment is connected with the device inside the oven through cables.
The pressure regulating and controlling device is composed of a stress flat plate 1, a stress bolt 2, a bolt column 3, a pressure sensor 4, a pressure display 5, a sensor supporting plate 6, a high-strength spring 7, a spring supporting plate 8 and a base 9. The device provides certain pressure for the material interface by controlling the fastening degree of the nut on the stressed flat plate 1 and matching with the high-strength spring 7.
Specifically, among the pressure regulation and control device, 4 bolt columns 3 run through atress flat board 1, sensor layer board 6, high strength spring 7, spring layer board 8 and base 9 respectively, and the perforation position evenly distributed is in the edge of each flat board, and base 9 adopts hexagon nut and bolt column fastening, and the bolt column is long 250mm, and diameter 10 mm. Wherein the stress plate 1, the sensor supporting plate 6, the spring supporting plate 8 and the base 9 are all designed in a circular shape, and the diameter is 150 mm.
Specifically, in the pressure regulating device, the pressure is provided by the fastening degree of the hexagon nut on the stress flat plate, the stress flat plate 1 concentrates the pressure on the stress bolt 2, and the stress bolt 2 is fixed in the middle of the stress flat plate 1 through the hexagon nut, and is 10mm in diameter and 80mm long. The bottom of the stressed bolt 2 is positioned in the middle of the plane of the pressure sensor 4, and pressure is regulated and controlled to the pressure sensor 4. The pressure sensor 4 is positioned at a clamping groove in the middle of the sensor tray 6, is connected with a pressure display 5 outside the oven, and regulates and controls pressure to 4 high-strength springs 7 through the sensor supporting plate 6, wherein the pressure sensor 4 is a cylinder-like body, is 30mm high and has a diameter of 56 mm. After the high-strength spring 7 is compressed, elastic force is transmitted to the insulating assembly through the spring supporting plate 6, and then the position of a material interface is regulated and controlled, wherein the diameter of the high-strength spring 7 is 40mm, the height of the high-strength spring is 100mm, and the center of the high-strength spring and the center of the bolt column 3 are located on the same vertical line. The bottom of the spring supporting plate 8 and the end part of the base 9 are respectively protruded to form a hollow cylinder with the height of 2.5mm and the wall thickness of 1mm, and the hollow cylinder is matched with the insulating assembly. The inside through-hole that is equipped with of base 9 links to each other with the hollow cylinder in middle part, provides the cable return circuit for the negative electrode, and the diameter is 3 mm. And 2mm through holes are reserved at the edges of the spring supporting plate 8 and the base 9 and are used for connecting banana plugs, so that the banana plugs are conveniently grounded. The lowest pressure born by the interface is the sum of the self-gravity of the stressed flat plate 1, the pressure sensor 4, the sensor supporting plate 6, the high-strength compression spring 1, the spring supporting plate 8 and the upper insulating shielding plate 10.
The insulating assembly is composed of an upper insulating shield plate 10, a lower insulating shield plate 11, a positive electrode insulating pad 12, and a negative electrode insulating pad 13. The insulation component provides insulation shielding for the spring supporting plate 8, the base 9 and the material to be detected through the insulation characteristic of the material of the insulation component.
Specifically, among the insulating assembly, go up insulating shield 10 and be the internal diameter 10mm, external diameter 100mm, the ring that polytetrafluoroethylene that thickness 2mm made, with the protruding hollow cylinder cooperation connection in spring supporting plate 8 bottom. The lower insulating shielding plate 11 is matched and connected with the protruding hollow cylinder of the base 9, and the size of the lower insulating shielding plate is consistent with that of the upper insulating shielding plate 10. An upper insulating shield plate 10 and a lower insulating shield plate 11 are used for the insulating spring bracket 8 and the base 9, respectively. The hollow cylinder protruding from the bottom of the spring supporting plate 8 and the base 9 is 0.5mm higher than the upper insulating base plate and the lower insulating base plate, so that the leakage current on the non-interface side in the test process can be effectively inhibited. The positive electrode insulation backing plate 12 is a polytetrafluoroethylene ring with the inner diameter of 14mm, the outer diameter of 20mm and the thickness of 1mm, is positioned in the middle of the lower insulation shielding plate 11, and the position height of the positive electrode can be adjusted by increasing or decreasing the quantity of the backing plates. The negative electrode insulating backing plate 13 is a polytetrafluoroethylene ring with the inner diameter of 2mm, the outer diameter of 10mm and the thickness of 1mm, and is positioned on the convex hollow cylinder of the base 9, and the position height of the negative electrode can be adjusted by increasing or decreasing the quantity of the backing plates.
Further, the electrode assembly contains a double semicircular ring-shaped positive electrode 14 and a circular ring-shaped negative electrode 15. The double semicircular positive electrodes are located on the external joint of the interface of the material No. 1 to be tested and the material No. 2, a positive electrode insulation base plate 12 is padded below the double semicircular positive electrodes, the double semicircular positive electrodes 14 are connected and fastened through bolts, the double semicircular positive electrodes are tightly jointed outside a material joint, the inner diameter of the double semicircular positive electrodes is the same as the outer diameter of the material No. 1 and the material No. 2, and the thickness and the width of the double semicircular positive electrodes are. The circular negative electrode 15 is positioned in the interface between the No. 1 material to be detected and the No. 2 material to be detected, is attached to the joint of the materials, and is padded with a negative electrode insulating padding plate 13 with the inner diameter of 2mm, the outer diameter of 10mm and the thickness of 3 mm. The middle round hole of the circular negative electrode 15 is connected with an external measurement circuit through a 2mm banana plug, and the reserved interface of the double semicircular positive electrode 14 is connected with external power supply equipment through a 2mm banana plug.
The working flow of the method for testing the material interface provided by the invention is shown in fig. 5. The following is specifically illustrated from two examples. In the example, the material No. 1 and the material No. 2 are in the shape of circular ring-shaped sheets, the inner diameter of the circular ring-shaped sheets is 10mm, the outer diameter of the circular ring-shaped sheets is 14mm, and the thickness of the circular ring-shaped sheets is 3 mm; the positive electrode (14) is annular, has the inner diameter of 14mm and surrounds the periphery of the circular sheet; the negative electrode (14) is circular and has a diameter of 10 mm. The holes of the upper insulating shielding plate 10 and the lower insulating shielding plate 11 are round holes, and the diameter of each hole is 10 mm; the spring supporting plate 8 and the base 9 are protruded to be hollow cylinders, the height of the spring supporting plate is 0.5mm higher than that of the upper insulating base plate or the lower insulating base plate, and the outer diameter of the protrusion is 10 mm.
Example 1, interfacial conductivity test, comprising the steps of:
step 1: samples were prepared.
The method comprises the steps of preparing a No. 1 sample and a No. 2 sample by using cross-linked polyethylene (XLPE) as a material, wherein the No. 1 sample and the No. 2 sample are circular rings with the same size, the inner diameter of the circular rings is 10mm, the outer diameter of the circular rings is 14mm, the thickness of the circular rings is 3mm, the surface of the material is polished by 80-mesh abrasive paper, and an interface is formed by contacting 2 materials.
Step 2: calculating the area of the material interface according to the geometrical structure of the material interface, wherein the formula is as follows:
where pi is the circumference ratio, R2Is the outer radius, R, of the ring material to be measured1Is the inner radius of the ring material to be measured. The interfacial area of the material is 0.75cm2。
And step 3: selecting 1MPa as the material interface test pressure, and calculating the pressure applied by the pressure regulating device, wherein the calculation formula is as follows:
N＝P*S-G
in the formula, P is the test pressure, S is the material interface area, G is the sum of the self-gravity of the stressed flat plate, the pressure sensor, the sensor supporting plate, the high-strength compression spring, the spring flat plate and the upper insulation shielding plate, and G is 0.3 kG. The pressure regulating device applies a pressure of N7.2 kG.
And 4, step 4: and (5) installing an insulating component.
And the upper and lower insulating shielding plates are respectively connected with the spring supporting plate and the hollow cylinder protruding from the base in a matching manner. The height positions of the double semicircular positive electrodes and the circular negative electrodes are adjusted by increasing or decreasing the quantity of the positive and negative electrode insulating base plates;
and 5: and (5) installing the test sample.
Installing the No. 1 and No. 2 materials to be detected in the middle of the base, enabling the inner circular holes to be nested on the hollow cylinder protruding out of the base, and enabling the No. 1 material to be in contact with the No. 2 material to form an interface to be detected;
step 6: the electrode assembly is mounted.
The double semicircular ring-shaped positive electrode is arranged outside an interface of a No. 1 material and a No. 2 material to be detected, the position of the double semicircular ring-shaped positive electrode is adjusted to be attached to a material joint, the circular ring-shaped negative electrode is arranged inside the interface of the No. 1 material and the No. 2 material to be detected, the position of the circular ring-shaped negative electrode is adjusted to be attached to the material joint, and the two semicircular ring-shaped positive electrodes are fastened through bolts;
and 7: and installing a pressure regulating device.
4 bolt columns run through the base, and the tip of bolt column adopts the nut to fix with the base. The stressed bolt is fixed in the middle of the stressed flat plate through a hexagon nut. The spring supporting plate, the high-strength spring, the sensor supporting plate and the stressed flat plate sequentially penetrate through the bolt columns, and the pressure sensor is placed at the clamping groove of the sensor supporting plate and connected with a pressure display outside the oven.
And 8: the pressure is set.
And (3) installing the nut of the stressed flat plate, and adjusting the fastening degree between the stressed flat plate and the hexagonal nut, so that the reading of the pressure sensor is N.
And step 9: setting the temperature of the oven and connecting an external circuit.
Placing the interface testing device in an oven, and positioning a pressure display outside the oven; the positive electrode and the negative electrode are connected with an external conductivity tester through a cable, a box door is closed, the testing temperature is set to be 30 ℃, and the constant temperature is kept for 15 minutes.
Step 10: and (6) testing.
The spring supporting plate and the base are grounded through a reserved interface; the voltage was programmed to 1kV and the data results of the tests were saved in the computer.
Step 11: the conductivity was calculated.
And selecting the stable current after 3000 seconds as the leakage current of the interface, and calculating the conductivity of the interface according to a formula.
In the formula, I is the stabilized interface test current, U is the applied voltage, L is the inner circumference, and d is the ring thickness. P is obtained by calculation as 8.15X 10-15And (5) S/m. Finally, the testing research work of the interface conductivity of the solid insulating material is realized.
Example 2, interfacial partial discharge test, comprising the steps of:
step 1: samples were prepared.
The method comprises the steps of preparing a No. 1 sample and a No. 2 sample by using cross-linked polyethylene (XLPE) as a material, wherein the No. 1 sample and the No. 2 sample are circular rings with the same size, the inner diameter of the circular rings is 10mm, the outer diameter of the circular rings is 14mm, the thickness of the circular rings is 3mm, the surface of the material is polished by 400-mesh abrasive paper, and an interface is formed by contacting 2 materials.
Step 2: calculating the area of the material interface according to the geometrical structure of the material interface, wherein the formula is as follows:
where pi is the circumference ratio, R2Is the outer radius, R, of the ring material to be measured1Is the inner radius of the ring material to be measured. The interfacial area of the material is 0.75cm2。
And step 3: selecting 1MPa as the material interface test pressure, and calculating the pressure applied by the pressure regulating device, wherein the calculation formula is as follows:
N＝P*S-G
in the formula, P is the test pressure, S is the material interface area, G is the sum of the self-gravity of the stressed flat plate, the pressure sensor, the sensor supporting plate, the high-strength compression spring, the spring flat plate and the upper insulation shielding plate, and G is 0.3 kG. The pressure regulating device applies a pressure of N7.2 kG. And 4, step 4: and (5) installing an insulating component.
And the upper and lower insulating shielding plates are respectively connected with the spring supporting plate and the hollow cylinder protruding from the base in a matching manner. The height positions of the double semicircular positive electrodes and the circular negative electrodes are adjusted by increasing or decreasing the quantity of the positive and negative electrode insulating base plates;
and 5: and (5) installing the test sample.
Installing the No. 1 and No. 2 materials to be detected in the middle of the base, enabling the inner circular holes to be nested on the hollow cylinder protruding out of the base, and enabling the No. 1 material to be in contact with the No. 2 material to form an interface to be detected;
step 6: the electrode assembly is mounted.
The double semicircular ring-shaped positive electrode is arranged outside an interface of a No. 1 material and a No. 2 material to be detected, the position of the double semicircular ring-shaped positive electrode is adjusted to be attached to a material joint, the circular ring-shaped negative electrode is arranged inside the interface of the No. 1 material and the No. 2 material to be detected, the position of the circular ring-shaped negative electrode is adjusted to be attached to the material joint, and the two semicircular ring-shaped positive electrodes are fastened through bolts;
and 7: and installing a pressure regulating device.
4 bolt columns run through the base, and the tip of bolt column adopts the nut to fix with the base. The stressed bolt is fixed in the middle of the stressed flat plate through a hexagon nut. The spring supporting plate, the high-strength spring, the sensor supporting plate and the stressed flat plate sequentially penetrate through the bolt columns, and the pressure sensor is placed at the clamping groove of the sensor supporting plate and connected with the pressure display.
And 8: the pressure is set.
And (3) installing the nut of the stressed flat plate, and adjusting the fastening degree between the stressed flat plate and the hexagonal nut, so that the reading of the pressure sensor is N.
And step 9: and connecting an external circuit.
The positive electrode and the negative electrode are connected with an external partial discharge tester through a cable, and the interface testing device is located in a room temperature environment.
Step 10: and (6) testing.
The spring supporting plate and the base are grounded through a reserved interface; the testing device is calibrated by adopting a charge calibrator, the voltage of the transformer is boosted at the rate of 80V/s through program control, when the local discharge amount reaches 100pC, the voltage is quickly reduced and returned to zero, the experiment is ended, the local discharge data in the experiment process is recorded, and the result is stored in a computer. Finally, the test research work of the solid insulating material interface partial discharge test is realized.
The testing device can be suitable for testing and researching dielectric properties of a dielectric loss tester, a conductivity tester, a partial discharge tester, a breakdown tester, a lightning impulse voltage generator, an operation impulse voltage generator or various waveform generators on the interface of a solid material.
Claims (8)
1. The utility model provides a solid insulating material interface dielectric property testing arrangement which characterized in that: the device comprises a pressure regulation and control device, an insulation component, a material interface to be detected and an electrode component;
the electrode assembly comprises a positive electrode (14) and a negative electrode (15), and the interface of the material to be detected is formed by the upper and lower clinging of the No. 1 material and the No. 2 material; the shape of the material No. 1 is completely the same as that of the material No. 2, holes which are used for containing the negative electrode (15) and have the same shape and size with the negative electrode (15) are formed in the centers of the material No. 1 and the material No. 2, and the negative electrode (15) is located in the holes and clings to the inside of the interface joint of the material to be detected; the positive electrode (14) is tightly attached to and surrounds the outer part of the interface joint of the material to be measured;
the insulation assembly comprises an upper insulation shielding plate (10), a lower insulation shielding plate (11), a positive electrode insulation backing plate (12) and a negative electrode insulation backing plate (13);
the positive electrode insulating pad (12) is positioned at the lower part of the positive electrode (14) and is used for supporting and adjusting the height of the positive electrode (14); the negative electrode insulating pad (13) is positioned at the lower part of the negative electrode (15) and is used for supporting and adjusting the height of the negative electrode (15);
the interface of the material to be tested, the electrode assembly, the positive electrode insulating backing plate (12) and the negative electrode insulating backing plate (13) are all positioned between the upper insulating shielding plate (10) and the lower insulating shielding plate (11);
the pressure regulation and control device is used for regulating the pressure between the No. 1 material and the No. 2 material.
2. The device for testing the dielectric property of the interface of the solid insulating material according to claim 1, wherein: the pressure regulation and control device comprises a stress flat plate (1), a stress bolt (2), a bolt column (3), a pressure sensor (4), a pressure display (5), a sensor supporting plate (6), a spring (7), a spring supporting plate (8) and a base (9); the stressed bolt (2) is fixed in the middle of the stressed flat plate (1) through a nut; the bolt column (3) penetrates through the stressed flat plate (1), the sensor supporting plate (6), the spring (7), the spring supporting plate (8) and the base (9) respectively; the pressure sensor (4) is connected with the pressure display (5); two ends of the spring (7) are respectively contacted with the sensor supporting plate (6) and the spring supporting plate (8); the tail end of the bolt column (3) penetrating through the base (9) is fixed with the base (9) by adopting a nut; the bottom of the stressed bolt (2) is in contact with the pressure sensor (4); the pressure sensor (4) is fixed on the sensor supporting plate (6).
3. The device for testing the dielectric property of the interface of the solid insulating material as claimed in claim 2, wherein: the lower surface of the spring supporting plate (8) is provided with a bulge; the upper surface of the base (9) is provided with a bulge; a hole is formed in the center of the upper insulating shielding plate (10), and the upper insulating shielding plate is connected with the lower surface of the spring supporting plate (8) in a protruding fit mode through the hole; a hole is formed in the center of the lower insulating shielding plate (11), and the lower insulating shielding plate is connected with the upper surface of the base (9) in a protruding fit mode through the hole; the positive electrode insulating pad (12) is arranged between the lower insulating shielding plate (11) and the positive electrode (14), and the negative electrode insulating pad (13) is positioned at the upper end of the bulge of the base (9).
4. The device for testing the dielectric property of the interface of the solid insulating material as claimed in claim 3, wherein: the height of the bulge on the lower surface of the spring supporting plate (8) is greater than the thickness of the upper insulating shielding plate (10); the height of the bulge on the upper surface of the base (9) is greater than the thickness of the lower insulating shielding plate (11), the top of the bulge is tightly attached to the bottom of the negative electrode insulating pad (13), and the top of the negative electrode insulating pad (13) is tightly attached to the negative electrode.
5. The device for testing the dielectric property of the interface of the solid insulating material according to claim 1, wherein: the positive electrode (14) is tightly attached to and surrounds the outside of the interface of the material to be detected and consists of two parts, the two parts are connected through bolts to be matched with the outside of the interface of the material to be detected, and the fastening degree of the two parts is adjustable.
6. The device for testing the dielectric property of the interface of the solid insulating material as claimed in claim 4, wherein: the No. 1 material and the No. 2 material are in the shape of circular ring slices; the positive electrode (14) is annular and surrounds the periphery of the annular sheet; the negative electrode (14) is circular, and the diameter of the negative electrode (14) is the same as that of the circular hole in the circular sheet; the spring supporting plate (8) and the protrusions on the base (9) are hollow cylinders, the outer diameters of the hollow cylinders are the same as the diameter of the circular hole in the circular slice, the holes in the upper insulation shielding plate (10) and the lower insulation shielding plate (11) are round holes, and the hole diameters are the same as the diameter of the circular hole in the circular slice.
7. A method for testing the dielectric properties of the interface of the solid insulating material according to claim 4, comprising the following steps
Step 1: preparing a material No. 1 to be tested and a material No. 2 to be tested according to actual test requirements, wherein the materials are the same in size;
step 2: calculating the contact area of the material interface according to the geometric structure of the material interface;
and step 3: according to the actual test pressure requirement, the pressure required to be provided by the interface dielectric property test device is calculated, and the calculation formula is as follows:
N＝P*S-G
in the formula, P is testing pressure, S is material interface contact area, and G is the sum of self gravity of the stressed flat plate (1), the pressure sensor (4), the sensor supporting plate (6), the high-strength compression spring (7), the spring flat plate (8) and the upper insulating shielding plate (10);
and 4, step 4: mounting insulation assembly
The upper and lower insulating shielding plates are respectively connected with the spring supporting plate (8) and the base (9) in a protruding fit manner; the height positions of the positive electrode (14) and the negative electrode (15) are adjusted by increasing or decreasing the number of the positive electrode insulating base plate and the negative electrode insulating base plate;
and 5: installation sample
Installing the No. 1 and No. 2 materials to be detected in the middle of the base, enabling the inner holes of the materials to be nested on the bulges of the base, and enabling the No. 1 material to be in contact with the No. 2 material to form an interface to be detected;
step 6: mounting electrode assembly
The positive electrode (14) is arranged outside the interface of the No. 1 material and the No. 2 material to be detected, the position of the positive electrode (14) is adjusted to be attached to the joint of the materials, the negative electrode (15) is arranged inside the interface of the No. 1 material and the No. 2 material to be detected, and the position of the negative electrode (15) is adjusted to be attached to the joint of the materials;
and 7: installing a pressure regulating device;
and 8: set pressure
Adjusting the fastening degree of the nut on the stressed bolt (2) and the bolt column (3) to enable the reading of the pressure sensor (5) to be N;
and step 9: setting the temperature of the oven and connecting an external circuit
Placing the interface testing device in an oven, and positioning a pressure display (5) outside the oven; connecting the positive electrode (14) and the negative electrode (15) with external test equipment through cables, closing a box door, setting a test temperature, and starting an oven to enable the temperature to reach a set value;
step 10: testing
The spring supporting plate (8) and the base (9) are grounded through a reserved interface; and setting parameters of external test equipment according to the test requirements, starting the test and acquiring a test data result.
8. The method of claim 7, wherein the testing device is a dielectric loss tester, a conductivity tester, a partial discharge tester, a breakdown tester, a lightning impulse voltage generator, or an operating impulse voltage generator.
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