Insulation strength testing device

Abstract

The invention discloses an insulating strength testing device, which comprises an oil tank device; the sleeve is fixed on the oil tank device, one end of the sleeve is a power supply access end, the other end of the sleeve is a first electrode mounting end, and the first electrode mounting end is located in the oil tank device; the grounding device comprises a grounding electrode rod which is in sliding fit with the oil tank device, and one end, close to the first electrode mounting end, of the grounding electrode rod is a second electrode mounting end; the adjusting device is arranged on the oil tank device and used for driving the grounding electrode rod to move in the direction close to and away from the first electrode mounting end; and the force sensor is used for detecting the acting force between the first electrode and the second electrode. During testing, the force sensor can detect the acting force between the first electrode and the second electrode, and the adjusting device adjusts the force acting on the test sample piece according to the pressing force of the test sample piece in an actual scene, so that the force is matched with the pressing force in the actual scene, and the environment in the actual scene is simulated.

Description

Technical Field

[0001] The present invention relates to the technical field of transformers, and more particularly to an insulation strength testing device. Background Art

[0002] The safety and reliability of the transformer mainly depends on its insulation performance. The transformer insulation structure is subjected to AC and DC voltages, lightning impulse voltage and switching overvoltage. Testing and evaluating the oil-paper insulation status is of great engineering significance.

[0003] In the prior art, there is a test device for evaluating the insulation strength of oil-paper, in which a test sample to be tested is clamped between two electrodes, one of which is connected to a power source and the other is grounded. However, in the prior art, the clamping force of the two electrodes clamping the test sample is not adjustable or the adjustment is not precise, and the device can only complete the function of clamping the test sample, but cannot simulate the clamping force of the test sample in an actual scenario, resulting in an inaccurate evaluation of the insulation status.

[0004] Therefore, how to accurately simulate the clamping force of the test sample in the actual scene has become a technical problem that needs to be solved urgently by technical personnel in this field. Summary of the invention

[0005] In view of this, an object of the present invention is to provide an insulation strength test device to accurately simulate the clamping force of a test sample in an actual scenario.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] An insulation strength test device, comprising:

[0008] An oil tank device, the oil tank device having an oil filling hole, a vacuum port, and a hand hole for disassembling and assembling the test sample;

[0009] A sleeve is fixed on the oil tank device, and one end of the sleeve is a power supply access end, and the other end is a first electrode mounting end, the power supply access end is located outside the oil tank device, and the first electrode mounting end is located inside the oil tank device;

[0010] A grounding device, comprising a grounding electrode rod slidably fitted on the oil tank device, wherein one end of the grounding electrode rod close to the first electrode mounting end is a second electrode mounting end, the grounding device is used for grounding, the first electrode mounting end is mounted with a first electrode, and the second electrode mounting end is mounted with a second electrode;

[0011] an adjusting device, disposed on the oil tank device, for driving the grounding electrode rod to move in a direction close to and away from the first electrode mounting end;

[0012] The force sensor is used to detect the force between the first electrode and the second electrode.

[0013] Optionally, in the above insulation strength test device, the grounding electrode rod includes a first rod body and a second rod body, and the force sensor is connected between the first rod body and the second rod body.

[0014] Optionally, in the above insulation strength test device, the adjustment device includes an adjustment support device and a screw mechanism, and the screw mechanism includes:

[0015] An adjusting screw rod, the adjusting screw rod being rotatably supported on the adjusting support device;

[0016] The adjusting nut is slidably arranged on the adjusting support device and is threadably matched with the adjusting screw rod. The grounding electrode rod is connected to the adjusting nut.

[0017] Optionally, in the above-mentioned insulation strength testing device, one end of the adjusting screw rod extends outward from the adjusting support device, and a hand wheel is provided at one end of the adjusting screw rod extending outward from the adjusting support device.

[0018] Optionally, the above insulation strength test device further includes a distance measuring device for detecting the moving distance of the adjusting nut.

[0019] Optionally, in the above insulation strength test device, the distance measuring device includes:

[0020] A ruler, the ruler is arranged on the adjustment support device, and the ruler is provided with scale marks;

[0021] The cursor is slidably matched with the ruler and connected with the adjusting nut.

[0022] Optionally, in the above-mentioned insulation strength test device, the grounding device further comprises a dynamic sealing seat, the dynamic sealing seat has a sliding sealing cavity penetrating the axial direction, the grounding electrode rod is slidably matched in the sliding sealing cavity, and both ends of the grounding electrode rod respectively extend out of the sliding sealing cavity;

[0023] The oil tank device has a grounding device mounting hole, one end of the dynamic sealing seat extends into the oil tank device from the grounding device mounting hole, and the end of the other end is sealed and connected to the grounding device mounting hole.

[0024] Optionally, in the above insulation strength test device, the end of one end of the dynamic seal seat has a seal seat flange portion, and the seal seat flange portion is sealed and connected to the end surface of the grounding device mounting hole;

[0025] The adjustment support device is fixed to the sealing seat flange portion.

[0026] Optionally, in the above-mentioned insulation strength test device, at least one of the first electrode mounting end and the second electrode mounting end is connected to the corresponding electrode through a universal ball seat.

[0027] Optionally, in the above insulation strength test device, the universal ball seat is arranged at the first electrode mounting end, and the universal ball seat comprises:

[0028] A ball seat mounting member fixed to the first electrode mounting end;

[0029] A ball head support, fixed to the ball seat mounting piece;

[0030] A ball head is rotatably matched with the ball head support, and the first electrode is detachably mounted on the ball head;

[0031] The pressure head cooperates with the thread of the ball head support and is used to limit the ball head on the ball head support.

[0032] Optionally, in the above insulation strength test device, the oil tank device comprises an oil tank body, both ends of the oil tank body are respectively sealed with a first end cover and a second end cover, one of the bushing and the grounding device is supported on the first end cover, and the other is supported on the second end cover;

[0033] The top of the oil tank body is provided with the oil filling hole, the hand hole is provided on the oil tank body, and the vacuum port is provided on the hand hole cover plate of the hand hole.

[0034] Optionally, in the above insulation strength test device, the oil tank body is a cylindrical structure, and the first end cover and the second end cover are arranged at two ends of the oil tank body;

[0035] A first observation window is arranged in the middle of the oil tank body.

[0036] Optionally, in the above-mentioned insulation strength testing device, a second observation window is provided on the handhole cover plate.

[0037] Optionally, in the above insulation strength test device, a walking support frame is provided at the bottom of the oil tank body;

[0038] An oil discharge port is provided at the bottom of the oil tank body, and an oil discharge elbow joint is provided at the oil discharge port.

[0039] The insulation strength test device provided by the present invention, during the test, installs the test sample between the first electrode and the second electrode, and uses the adjustment device to control the distance between the first electrode and the second electrode, so that the test sample is clamped between the first electrode and the second electrode. The force sensor can detect the force between the first electrode and the second electrode, and according to the compression force of the test sample in the actual scene, the force acting on the test sample by the first electrode and the second electrode is adjusted by the adjustment device, so that the force matches the compression force in the actual scene, so as to simulate the environment in the actual scene.

[0040] After the oil tank device is evacuated through the vacuum port, oil is injected into the oil tank device through the oil injection hole. When injecting oil, ensure that the transformer oil covers the test sample. After the oil injection is completed, let it stand to ensure that the transformer oil completely permeates the test sample. The present invention sets standard electrodes on the bushing and the grounding device to establish an insulation test model of the test sample with an equivalent uniform electric field, and uses a partial discharge experimental platform to perform partial discharge test on the partial discharge characteristic quantity of the test sample to determine the insulation test result of the test sample. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present invention 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 invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0042] Figure 1 A schematic structural diagram of an insulation strength test device disclosed in an embodiment of the present invention from one angle;

[0043] Figure 2 A schematic structural diagram of the insulation strength test device disclosed in an embodiment of the present invention from another angle;

[0044] Figure 3 A cross-sectional view of an insulation strength test device disclosed in an embodiment of the present invention at one angle;

[0045] Figure 4 It is a schematic diagram of the structure of the sleeve disclosed in the embodiment of the present invention;

[0046] Figure 5 A cross-sectional view of a sleeve disclosed in an embodiment of the present invention;

[0047] Figure 6 A cross-sectional view of a grounding device and an adjusting device disclosed in an embodiment of the present invention;

[0048] Figure 7 for Figure 3 A partial enlarged view of middle A;

[0049] Figure 8 for Figure 3 A partial enlarged view of B in the middle;

[0050] Fig. 9 A cross-sectional view of the insulation strength test device disclosed in an embodiment of the present invention at another angle;

[0051] Fig.10 A schematic diagram of the structure of a first electrode disclosed in an embodiment of the present invention;

[0052] Fig.11 A schematic diagram of the structure of a second electrode disclosed in an embodiment of the present invention;

[0053] Fig.12 A schematic diagram of the structure of a third electrode disclosed in an embodiment of the present invention;

[0054] Fig.13 This is a schematic diagram of the structure of the fourth electrode disclosed in an embodiment of the present invention.

[0055] The meanings of the reference numerals in the figures are as follows:

[0056] 100- oil tank device; 101- oil tank body; 102- first end cover; 103- second end cover; 104- hand hole; 105- hand hole cover plate; 106- second observation window; 107- oil drain elbow joint; 108- first observation window; 109- walking support frame;

[0057] 200-adjusting device; 201-adjusting screw rod; 202-adjusting nut; 203-hand wheel; 204-adjusting supporting device;

[0058] 300-grounding device; 301-dynamic sealing seat; 302-grounding electrode rod;

[0059] 400-distance measuring device; 401-ruler; 402-cursor;

[0060] 500-Casing;

[0061] 600-electrode assembly; 601-first electrode; 602-second electrode;

[0062] 700-universal ball seat; 701-ball seat mounting; 702-ball head support; 703-pressure head; 704-ball head. DETAILED DESCRIPTION

[0063] The core of the present invention is to provide an insulation strength test device to accurately simulate the clamping force of the actual scene of the test sample.

[0064] The following embodiments are described with reference to the accompanying drawings. In addition, the embodiments shown below do not limit the invention contents described in the claims. In addition, the entire contents of the structures represented by the following embodiments are not limited to those necessary as solutions to the inventions described in the claims. It should be noted that, for ease of description, only the parts related to the inventions are shown in the accompanying drawings. The embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0065] like Figure 1 and Figure 2 As shown, the insulation strength test device disclosed in the embodiment of the present invention includes an oil tank device 100, a bushing 500, a grounding device 300, an adjustment device 200 and a force sensor.

[0066] The oil tank device 100 has an oil filling hole, a vacuum port, and a hand hole 104 for disassembling and assembling the test sample. The oil filling hole is used to inject transformer oil into the oil tank device 100 to simulate the environment inside the transformer. In addition, the temperature of the transformer oil injected into the oil tank device 100 can be adjusted to simulate the temperature environment of the transformer. The vacuum port is used to vacuum the oil tank device 100, and the hand hole 104 is used to disassemble and assemble the test sample (i.e., the insulating paperboard).

[0067] The sleeve 500 is fixed on the oil tank device 100, and one end of the sleeve 500 is a power supply access end, and the other end is a first electrode installation end, the power supply access end is located outside the oil tank device 100, and the first electrode installation end is located inside the oil tank device 100. The AC power supply is introduced into the oil tank device 100 through the sleeve 5 and forms an electrical circuit through the grounding device 300 to ensure the safety of the entire equipment and operators.

[0068] like Figure 6 As shown, the grounding device 300 includes a grounding electrode rod 302 that is slidably matched with the oil tank device 100. The grounding electrode rod 302 and the casing 500 can be coaxially arranged, and the sliding direction of the grounding electrode rod 302 is the direction close to and away from the first electrode mounting end. The end of the grounding electrode rod 302 close to the first electrode mounting end is the second electrode mounting end, and the grounding device 300 is used for grounding. The grounding electrode rod 302 can adjust the distance between the first electrode mounting end and the second electrode mounting end by sliding.

[0069] like Figure 3 As shown, the first electrode mounting end and the second electrode mounting end are used to mount the electrode assembly 600, and the electrode assembly 600 is respectively a first electrode 601 mounted on the first electrode mounting end and a second electrode 602 mounted on the second electrode mounting end. Common standard electrodes are as follows Figure 11-13As shown, those skilled in the art can select corresponding electrodes according to test requirements. Each type of test corresponds to different electrodes, and the electrodes are all standard electrodes made of brass for uniform electric field.

[0070] The adjusting device 200 is arranged on the oil tank device 100, and is used to drive the grounding electrode rod 302 to move in the direction close to and away from the first electrode mounting end. By driving the second electrode mounting end to move in the direction close to the first electrode mounting end, the clamping force on the test sample clamped between the first electrode 601 and the second electrode 602 can be adjusted. The force sensor is used to detect the force between the first electrode mounting end and the second electrode mounting end, that is, it can detect the force acting on the test sample, that is, the clamping force of clamping the test sample. According to the value detected by the force sensor, the position of the grounding electrode rod 302 is adjusted by using the adjusting device 200, and then the clamping force acting on the test sample can be the same as or close to the actual scene, so as to accurately simulate the force state in the actual scene.

[0071] The insulation strength test device provided by the present invention, during the test, installs the test sample between the first electrode 601 and the second electrode 602, and uses the adjustment device 200 to control the distance between the first electrode 601 and the second electrode 602, so that the test sample is clamped between the first electrode 601 and the second electrode 602. The force sensor can detect the force between the first electrode 601 and the second electrode 602, and according to the compression force of the test sample in the actual scene, the adjustment device 200 adjusts the force of the first electrode 601 and the second electrode 602 acting on the test sample, so that the force matches the compression force in the actual scene, so as to simulate the compression environment in the actual scene. Since the thickness of the test sample will change after being clamped, and its insulation strength will also change after the thickness changes, so applying the same or similar force to the test sample can more accurately simulate the environment in the actual scene and improve the accuracy of the test.

[0072] After the oil tank device 100 is evacuated through the vacuum port, under normal circumstances, the vacuum can be evacuated to 10-150Pa and then the vacuum can be maintained for 5-30 minutes, and oil can be injected into the oil tank device 100 through the oil injection hole. When injecting oil, ensure that the transformer oil covers the test sample. After the oil injection is completed, let it stand to ensure that the transformer oil completely penetrates the test sample. The present invention sets standard electrodes on the bushing 500 and the grounding device 300 to establish an insulation test model of the test sample with an equivalent uniform electric field, and uses a partial discharge experimental platform to perform a partial discharge test on the partial discharge characteristic quantity of the test sample to determine the insulation test result of the test sample.

[0073] In a specific embodiment of the present invention, the ground electrode rod 302 can be divided into two parts, namely a first rod body and a second rod body. It should be noted that the ground electrode rod 302 can also be divided into more sections according to needs. A force sensor is connected between the first rod body and the second rod body. When the force acting on the test sample by the first electrode 601 and the second electrode 602 changes, the force will act on the force sensor through the first rod body and the second rod body and be detected by the force sensor. The force sensor can be a fiber optic pressure sensor, or other force sensors can be selected according to needs and the location of the setting, as long as it can detect the force acting on the test sample by the first electrode 601 and the second electrode 602.

[0074] like Figure 6 and Figure 7 As shown, the adjusting device 200 includes an adjusting support device 204 and a screw mechanism, and the screw mechanism includes an adjusting screw rod 201 and an adjusting nut 202 .

[0075] The adjusting support device 204 can be set as a bracket structure or a cylindrical structure. The adjusting screw rod 201 is rotatably supported on the adjusting support device 204, and the adjusting nut 202 is slidably arranged on the adjusting support device 204, that is, the adjusting support device 204 has a guide rail that slides with the adjusting nut 202, so that the adjusting nut 202 can only move along the guide rail and cannot rotate. In order to ensure the degree of freedom of the screw mechanism, the guide rail is arranged in parallel with the adjusting screw rod 201.

[0076] The adjusting screw nut 202 is threadedly matched with the adjusting screw rod 201, and the grounding electrode rod 302 is connected to the adjusting screw nut 202. By rotating the adjusting screw rod 201, the adjusting screw nut 202 can move along the guide rail under the action of the screw transmission, and the moving direction of the adjusting screw nut 202 can be controlled by controlling the rotating direction of the adjusting screw rod 201. According to different moving directions of the adjusting screw nut 202, the grounding electrode rod 302 can be driven to move toward the casing 500 or away from the casing 500.

[0077] In this embodiment, the lead screw mechanism is used as the main mechanism of the adjustment device 200. The ground electrode rod 302 can move one pitch every time the lead screw 201 rotates one circle, which makes it easier to control the distance between the first electrode 601 and the second electrode 602, and the adjustment accuracy is higher.

[0078] In order to facilitate the rotation of the adjusting screw 201, in this embodiment, one end of the adjusting screw 201 is extended outward from the adjusting support device 204, and a hand wheel 203 is provided at one end of the adjusting screw 201 extending outward from the adjusting support device 204. The hand wheel 203 has a larger size and a larger force arm, and it is more labor-saving to rotate the adjusting screw 201. The hand wheel 203 can be designed to be circular, or to be designed to be other shapes according to requirements, as long as a force arm can be formed to achieve a labor-saving effect.

[0079] When testing an insulating member with an oil channel, an oil gap needs to be set on the test sample, so the test sample can be designed into two parts, one of which is fixed on the first electrode 601, and the other is fixed on the second electrode 602. In order to simulate the environment of the insulating member with an oil channel in the transformer, the distance between the two parts of the test sample needs to be adjusted to be the same as or close to the oil gap in the actual scene.

[0080] In order to improve the adjustment accuracy, Fig. 9 As shown, the insulation strength test device disclosed in this embodiment also includes a distance measuring device 400 for detecting the moving distance of the adjusting screw nut 202. The distance measuring device 400 can be used to measure the moving distance of the adjusting screw nut 202, that is, the moving distance of the second electrode 602 can be measured, so that the distance between the first electrode 601 and the second electrode 602 can be derived, that is, the distance between the two parts of the test sample can be obtained. In summary, according to the measurement result of the distance measuring device 400, the distance between the two parts of the test sample (that is, the insulation distance) can be controlled to be the same as or close to the oil gap in the actual scene.

[0081] Further, in this embodiment, the distance measuring device 400 includes a scale 401 and a cursor 402. The scale 401 is arranged on the adjustment support device 204, for example, it can be fixed on the adjustment support device 204 by a bracket, and a scale mark is arranged on the scale 401. The cursor 402 is slidably matched with the scale 401 and connected to the adjustment nut 202. When the adjustment nut 202 moves, the cursor 402 is driven to move, and the cursor 402 slides on the scale 401. The position of the cursor 402 can indicate the scale on the scale 401, so that the corresponding data can be read.

[0082] A certain position can be used as the starting position. For example, when the first electrode 601 and the second electrode 602 are in contact, the cursor 402 indicates the 0 scale on the ruler 401. Then, as the cursor 402 moves, the scale value indicated by the cursor 402 on the ruler 401 is the distance value between the first electrode 601 and the second electrode 602. It should be noted that other positions can also be used as the starting position, and those skilled in the art can set it according to requirements. The distance between the first electrode 601 and the second electrode 602 can be controlled between 0-200 mm by using the adjustment device 200, and the clamping force adjustment range can be controlled between 0-50 N. The required parameters can be adjusted when installing the test sample according to the test requirements.

[0083] like Figure 6 As shown, the grounding device 300 may also include a dynamic sealing seat 301, which has a sliding sealing cavity that runs through the axial direction, and the grounding electrode rod 302 is slidably matched with the sliding sealing cavity. It should be noted that the end of the sliding sealing cavity needs to be dynamically sealed with the grounding electrode rod 302 to prevent transformer oil from leaking through the sliding sealing cavity.

[0084] Both ends of the grounding electrode rod 302 extend out of the sliding seal cavity respectively, so as to prevent the grounding electrode rod 302 from being separated from the dynamic seal position during movement, thereby causing transformer oil to leak through the sliding seal cavity. That is, although the grounding electrode rod 302 can reciprocate along the sliding seal cavity, neither end of the grounding electrode rod 302 can extend into the sliding seal cavity, that is, both ends of the grounding electrode rod 302 extend out of the sliding seal cavity at any time.

[0085] The oil tank device 100 has a grounding device mounting hole, one end of the dynamic seal seat 301 extends into the oil tank device 100 through the grounding device mounting hole, and the other end is sealed and connected to the grounding device mounting hole to prevent transformer oil from leaking through the grounding device mounting hole.

[0086] Furthermore, the end of one end of the dynamic seal seat 301 has a seal seat flange, which is sealed and connected to the end surface of the grounding device mounting hole, and can be fixed by fasteners. The adjustment support device 204 is fixed to the seal seat flange.

[0087] In order to ensure the coaxiality and parallelism of the first electrode 601 and the second electrode 602, in this embodiment, at least one of the first electrode mounting end and the second electrode mounting end is connected to the corresponding electrode through the universal ball seat 700. That is, one of the first electrode 601 and the second electrode 602 can be mounted on the corresponding electrode mounting end through the universal ball seat 700, so that the electrode can generate a certain deflection through the universal ball seat 700 to maintain the coaxiality and parallelism with the other electrode.

[0088] like Figure 4 and Figure 5As shown, in this embodiment, since the sleeve 500 has a larger volume, the universal ball seat 700 is arranged at the first electrode installation end, which is easier to install.

[0089] like Figure 5 and Figure 8 As shown, the universal ball seat 700 may include a ball seat mounting member 701, a ball head support 702, a ball head 704 and a pressure head 703. The ball seat mounting member 701 is fixed to the first electrode mounting end, and the ball head support 702 is fixed to the ball seat mounting member 701. Specifically, the ball seat mounting member 701 and the first electrode mounting end, as well as the ball head support 702 and the ball seat mounting member 701, can be connected by fasteners.

[0090] The ball head 704 is rotatably matched with the ball head support 702, and a spherical groove matched with the ball head 704 is provided on the ball head support 702, so that the ball head 704 can rotate in the spherical groove. A connecting portion for connecting the first electrode 601 is provided on the ball head 704, and the connecting portion can be designed according to the connecting portion on the standard electrode. For example, when the connecting portion on the electrode is a screw, the connecting portion on the ball head 704 is a threaded hole, so as to realize the detachable connection between the first electrode 601 and the ball head 704 by threaded matching.

[0091] The pressure head 703 is threadedly matched with the ball head support 702, and is used to limit the ball head 704 on the ball head support 702. One end of the pressure head 703 has a notch, so that the first electrode 601 can be detachably connected to the ball head 704 through the notch. It should be noted that the size of the notch is smaller than the ball diameter of the ball head 704 to prevent the ball head 704 from falling off through the notch. The end of the pressure head 703 opposite to the notch is an internal thread end, and the ball head support 702 has an external thread end that matches the internal thread end. Through the threaded matching of the internal thread end and the external thread end, the ball head 704 can be limited on the ball head support 702, so that the ball head 704 can only rotate and cannot be separated from the ball head support 702 by moving.

[0092] like Figure 2 As shown, in this embodiment, the oil tank device 100 may include an oil tank body 101, and the two ends of the oil tank body 101 are respectively sealed with a first end cover 102 and a second end cover 103. The oil tank body 101, the first end cover 102 and the second end cover 103 can all be made of stainless steel. The oil tank device 100 is mainly used as a bearing container and can withstand a pressure range of 1Pa-20kPa.

[0093] One of the sleeve 500 (sleeve 500 can be grounded separately) and the grounding device 300 is supported on the first end cover 102, and the other is supported on the second end cover 103. The top of the oil tank body 101 is provided with an oil filling hole, a hand hole 104 is provided on the oil tank body 101, and a vacuum port is provided on the hand hole cover plate 105 of the hand hole 104. The replacement and removal of electrodes and test samples are carried out through the hand hole 104. The hand hole 104 can be provided with a quick release structure to facilitate opening and closing the hand hole cover plate 105. The hand hole quick release can adopt a clamping type vacuum quick release flange structure, which is quick to disassemble and has good sealing performance.

[0094] The oil tank body 101 is a cylindrical structure, and the first end cover 102 and the second end cover 103 are arranged at both ends of the oil tank body 101. An opening needs to be reserved on the first end cover 102 to install the sleeve 500, and three openings need to be reserved on the second end cover 103, and a pressure gauge, a temperature gauge and a grounding device 300 are installed from top to bottom. The pressure gauge and the temperature gauge respectively detect the pressure and temperature of the transformer oil in the oil tank body 101 to simulate the pressure and temperature in the actual scene.

[0095] A first observation window 108 is provided in the middle of the oil tank body 101, and a second observation window 106 is provided on the hand hole cover plate 105. The first observation window 108 can be arranged in the middle area of ​​the oil tank body 101 in the axial direction and the height direction, and should specifically match the position of the test sample, so that the test process can be monitored at any time through the first observation window 108. The first observation window 108 can be in the form of a flange clamped glass and connected by bolts. The oil level can be observed through the second observation window 106, and it can be judged whether the oil level has reached the top of the oil tank body 101. After reaching the top of the oil tank body 101, stop filling the oil.

[0096] A traveling support frame 109 is provided at the bottom of the fuel tank body 101, and the traveling support frame 109 may include a support frame and traveling wheels provided at the bottom of the support frame. The support frame may be designed as a trapezoidal structure, with a smaller bottom and the fuel tank body 101, and a larger bottom equipped with traveling wheels, so as to improve the supporting reliability of the traveling support frame 109. Both sides of the lower end of the fuel tank body 101 may be supported by a trapezoidal support frame, and welded to the fuel tank body 101. Through the traveling wheels, the entire insulation strength test device can be conveniently and quickly moved to a position of an effective electrical distance, saving manpower.

[0097] An oil drain port is provided at the bottom of the oil tank body 101, and an oil drain elbow joint 107 is provided at the oil drain port. The oil drain elbow joint 107 can be used to extend the oil drain port to a position away from the oil tank body 101, so as to facilitate later operations.

[0098] The insulation strength test device disclosed in the embodiment of the present invention does not require excessive manual intervention, and the test results are more accurate and efficient. At the same time, it can accurately simulate the temperature, electric field, and application environment of the insulation material in the actual operation of the transformer, which is closer to the actual environment.

[0099] As shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an", "a kind" and / or "the" do not refer to the singular, but also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of clearly identified steps and elements, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements. The elements defined by the sentence "includes a..." do not exclude the existence of other identical elements in the process, method, commodity or device that includes the elements.

[0100] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0101] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0102] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core ideas of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A dielectric strength test device, characterized in that: include: An oil tank device (100), the oil tank device (100) having an oil filling hole, a vacuum port, and a hand hole (104) for disassembling and assembling a test sample; A sleeve (500) is fixed to the oil tank device (100), and one end of the sleeve (500) is a power supply access end, and the other end is a first electrode mounting end, the power supply access end is located outside the oil tank device (100), and the first electrode mounting end is located inside the oil tank device (100); A grounding device (300) comprising a grounding electrode rod (302) slidably engaged with the oil tank device (100); an end of the grounding electrode rod (302) close to the first electrode mounting end is a second electrode mounting end; the grounding device (300) is used for grounding; a first electrode (601) is mounted on the first electrode mounting end; and a second electrode (602) is mounted on the second electrode mounting end; an adjusting device (200), arranged on the oil tank device (100), and used for driving the grounding electrode rod (302) to move in a direction approaching and moving away from the first electrode mounting end; A force sensor is used to detect the force between the first electrode (601) and the second electrode (602).

2. The insulation strength test device according to claim 1, characterized in that: The grounding electrode rod (302) comprises a first rod body and a second rod body, and the force sensor is connected between the first rod body and the second rod body.

3. The insulation strength test device according to claim 1, characterized in that: The adjusting device (200) comprises an adjusting support device (204) and a screw mechanism, wherein the screw mechanism comprises: An adjusting screw rod (201), the adjusting screw rod (201) being rotatably supported on the adjusting support device (204); The adjusting nut (202) is slidably disposed on the adjusting support device (204) and is threadably engaged with the adjusting screw rod (201); the grounding electrode rod (302) is connected to the adjusting nut (202).

4. The insulation strength test device according to claim 3, characterized in that: One end of the adjusting screw rod (201) protrudes outward from the adjusting support device (204), and a hand wheel (203) is provided at one end of the adjusting screw rod (201) protruding outward from the adjusting support device (204).

5. The insulation strength test device according to claim 3, characterized in that: It also includes a distance measuring device (400) for detecting the moving distance of the adjusting nut (202).

6. The insulation strength test device according to claim 5, characterized in that: The distance measuring device (400) comprises: A ruler (401), the ruler (401) being arranged on the adjustment support device (204), and the ruler (401) being provided with scale markings; The cursor (402) is slidably matched with the scale (401) and is connected to the adjusting nut (202).

7. The insulation strength test device according to claim 3, characterized in that: The grounding device (300) further comprises a dynamic sealing seat (301), the dynamic sealing seat (301) having a sliding sealing cavity penetrating in an axial direction, the grounding electrode rod (302) slidingly fitting in the sliding sealing cavity, and both ends of the grounding electrode rod (302) respectively extending out of the sliding sealing cavity; The oil tank device (100) has a grounding device mounting hole, one end of the dynamic seal seat (301) extends into the oil tank device (100) from the grounding device mounting hole, and the end of the other end is sealed and connected to the grounding device mounting hole.

8. The insulation strength test device according to claim 7, characterized in that: An end portion of one end of the dynamic sealing seat (301) has a sealing seat flange portion, and the sealing seat flange portion is sealingly connected to the end surface of the grounding device mounting hole; The adjustment support device (204) is fixed to the sealing seat flange portion.

9. The insulation strength test device according to any one of claims 1 to 8, characterized in that: At least one of the first electrode mounting end and the second electrode mounting end is connected to a corresponding electrode via a universal ball seat (700).

10. The insulation strength test device according to claim 9, characterized in that: The universal ball seat (700) is arranged at the first electrode mounting end, and the universal ball seat (700) comprises: A ball seat mounting member (701) is fixed to the first electrode mounting end; A ball head support (702) fixed to the ball seat mounting member (701); A ball head (704) is rotatably matched with the ball head support (702), and the first electrode (601) is detachably mounted on the ball head (704); The pressure head (703) is threadably matched with the ball head support (702) and is used to limit the ball head (704) to the position on the ball head support (702).

11. The insulation strength test device according to any one of claims 1 to 8, characterized in that: The oil tank device (100) comprises an oil tank body (101), the two ends of the oil tank body (101) are respectively sealed with a first end cover (102) and a second end cover (103), one of the sleeve (500) and the grounding device (300) is supported on the first end cover (102), and the other is supported on the second end cover (103); The oil filling hole is arranged on the top of the oil tank body (101), the hand hole (104) is arranged on the oil tank body (101), and the vacuum port is arranged on a hand hole cover plate (105) of the hand hole (104).

12. The insulation strength test device according to claim 11, characterized in that: The oil tank body (101) is a cylindrical structure, and the first end cover (102) and the second end cover (103) are arranged at two ends of the oil tank body (101); A first observation window (108) is provided in the middle of the oil tank body (101).

13. The insulation strength test device according to claim 11, characterized in that: The hand hole cover plate (105) is provided with a second observation window (106).

14. The insulation strength test device according to claim 11, characterized in that: A walking support frame (109) is provided at the bottom of the oil tank body (101); An oil discharge port is provided at the bottom of the oil tank body (101), and the oil discharge port is provided with an oil discharge elbow joint (107).

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