A transformer test tool for pot-type insulator outlet

Abstract

The present invention discloses a transformer test tool with a pot-type insulator outlet, which specifically relates to the field of transformer test technology, including a detection host and a detection platform, wherein the pot-type outlet structure includes an outlet pot, and the outlet pot is installed in a corresponding outlet base on the transformer to be tested; the detection host is provided with a test inspection tool, which is composed of a tool housing, a test sleeve and an internal plug-in connection conductor, and a charging and discharging valve seat and a gas pressure gauge are provided on the tool housing. The transformer test tool with a pot-type insulator outlet of the present invention meets the requirements of the test output end of such transformers, can be used for standardized design, can be reused on products of the same voltage level, can meet the requirements of the low-voltage end common box outlet, is not affected by the installation time, space, and connection structure of the transformer body, so that the transformer with a pot-type insulator outlet does not need to consider the requirements of the air insulation level when designing the high-voltage outlet, thereby reducing the use cost and time cost.

Description

Technical Field

[0001] The invention relates to the technical field of transformer testing, and more particularly to a transformer testing tool for a pot-type insulator outlet. Background Art

[0002] Power transformers are important power equipment in power systems, used to transform the size of AC voltage. In order to ensure the normal operation and safe use of the transformer, it is necessary to conduct corresponding tests and trials after the transformer is produced and during later use. During the test, the high voltage, neutral point, and low voltage of the transformer must have output points connected to high voltage generators, voltage dividers and other test equipment or directly grounded. Conventional transformers use bushings as output points, which are connected to the test equipment on the outside and the leads on the inside. The inside of the shell where the bushing is installed is connected to the internal coil by leads, and transformer oil is filled to meet the insulation level requirements. During actual testing, the test equipment connects the above bushings and then conducts the test.

[0003] However, with the development of transformer technology, many fully sealed transformers have appeared in the prior art. The main feature of the fully sealed transformer is that effective measures are adopted to completely isolate the transformer oil from air and sunlight, to prevent the transformer oil from oxidation and moisture, so as to slow down the aging speed of the transformer insulation, reduce the daily maintenance and repair of the transformer, and extend the service life of the transformer. Its outgoing line does not need to use the commonly used bushing structure, and mainly uses a basin insulator as the outgoing line. For example, a basin insulator outgoing line structure transformer with publication number CN205230779U includes an oil tank and a basin insulator connected to the internal lead of the oil tank through a fastener. The basin insulator is connected to the cable terminal in the cable box through another lead. The basin insulator is composed of a core rod and an insulating layer. A jack is provided in the center of the insulating layer. The core rod is vertically inserted into the jack. The insulating layer is basin-shaped. This patent replaces the oil casing with a basin insulator, does not require equipment investment, is simple to manufacture, has a short cycle, low cost, and is easy to manufacture and install.

[0004] Therefore, for some fully enclosed transformers with pot-type insulators as the output type, there is no bushing as the output carrier of the main body. If the pot-type output of the transformer is directly connected to the external equipment, it is difficult to meet the insulation distance requirements between charged bodies in the air during actual test and detection, which is easily affected, resulting in detection failure or even accidents. Summary of the invention

[0005] The invention provides a transformer test tool with a pot-type insulator as the outlet, and aims to solve the problem that the existing fully enclosed transformer with a pot-type insulator as the outlet has no bushing as the main body output carrier, and it is difficult to meet the insulation distance requirements between charged bodies in the air during actual testing, and it is easily affected, resulting in detection failure or even accidents.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a transformer test tool with a pot-type insulator outlet, comprising a detection host and a detection platform, the detection platform is used to carry the transformer to be tested, and a pot outlet structure is provided on the transformer to be tested, wherein the pot outlet structure comprises an outlet pot, and the outlet pot is installed in a corresponding outlet base on the transformer to be tested;

[0007] The detection host is provided with a test and detection tooling, which consists of a tooling shell, a test sleeve and an internal plug-in connection conductor. The tooling shell is used for docking and installation with the outlet base of each basin outlet structure, and the test sleeve is fixedly installed on the tooling shell. The inside of the tooling shell is provided with an internal plug-in connection conductor, which is plug-in connected with the outlet basin, and a positioning and fixing component and a sealing component are provided between the tooling shell and the outlet base;

[0008] A gas charging and discharging valve seat and a gas pressure gauge are arranged on the tooling shell, and the gas charging and discharging valve seat is connected with an insulating gas charging device.

[0009] In a preferred embodiment, the basin outlet structure includes a high-voltage outlet structure, a low-voltage outlet structure and a neutral point outlet structure, and the high-voltage outlet structure, the low-voltage outlet structure and the neutral point outlet structure are all composed of an outlet basin, and the test and detection tooling includes a high-voltage test and detection tooling, a low-voltage test and detection tooling and a neutral point test and detection tooling, and the high-voltage test and detection tooling, the low-voltage test and detection tooling and the neutral point test and detection tooling are all composed of a tooling shell, a test sleeve and an internal plug-in connecting conductor.

[0010] In a preferred embodiment, the testing table, the testing host and the test and detection tooling are all located in the testing room. A placement rack is provided on the testing host. The high-voltage test and detection tooling, the low-voltage test and detection tooling and the neutral point test and detection tooling are placed on the placement rack accordingly. An operating robot is provided in the testing room. The operating robot is used to clamp the corresponding test and detection tooling and install it on the corresponding basin outlet structure. The testing room is also provided with testing table rails and robot rails. The testing table is slidably set on the testing table rails, and the operating robot is slidably set on the robot rails.

[0011] In a preferred embodiment, a base flange is provided on the outlet base on the transformer to be tested, and a positioning and fixing assembly is provided corresponding to the base flange. The positioning and fixing assembly includes a sleeve, which is installed at the bottom of the tooling shell, and the sleeve is arranged in a flared shape. The diameter value of the sleeve at a position close to the bottom end face of the tooling shell is the same as the diameter value of the base flange, and pins are fixedly connected at the positions of the bolt holes on the base flange at the bottom of the tooling shell.

[0012] In a preferred embodiment, the positioning and fixing assembly also includes a rotating drum, which is installed on the outside of the tooling shell, and a sleeve is fixedly connected to the bottom of the rotating drum. A snap-fit ​​plate is rotatably installed in the side wall of the sleeve. After the tooling shell is docked with the outlet base, the snap-fit ​​plate rotates toward one side of the base flange and moves to the bottom of the base flange to contact and engage with the base flange.

[0013] In a preferred embodiment, the drum is rotatably arranged on the outside of the tooling shell, a rotating shaft is fixedly connected to the snap-fit ​​plate, a transmission gear is fixedly connected to the top of the rotating shaft, the transmission gear is rotatably installed in the side wall of the drum, and an arc-shaped rack is fixedly connected at the position of the transmission gear on the side wall of the tooling shell, and the transmission gear and the arc-shaped rack are meshed with each other.

[0014] In a preferred embodiment, a piston cavity is provided in the side wall of the tooling shell at a position corresponding to the rotating cylinder, a piston plate is slidably installed in the piston cavity, the piston plate slides laterally, a locking block is fixedly connected to the outer side of the piston plate, an annular groove is provided at the position of the rotating cylinder corresponding to the locking block, a slope structure is provided on the top of the locking block, the top of the annular groove in the rotating cylinder is provided as a conical surface structure adapted to the slope structure of the locking block, a latching tooth is provided between the slope structure of the locking block and the conical surface structure, when the air pressure in the tooling shell increases, the piston plate pushes the locking block outward, so that the slope structure of the locking block contacts the top wall of the annular groove in the rotating cylinder.

[0015] In a preferred embodiment, the sealing assembly includes a sealing ring, an annular mounting groove is provided at the bottom of the tooling shell at a position corresponding to the base flange, the sealing ring is installed in the annular mounting groove, the bottom of the sealing ring contacts the top wall of the base flange, a pressure ring is provided on the top of the sealing ring, the pressure ring is slidably installed in the annular mounting groove, the top of the sealing ring cooperates with the wedge surface at the bottom of the wedge extrusion block, a wedge extrusion block is provided at a position corresponding to the pressure ring in the side wall of the tooling shell, the wedge extrusion block is laterally slidably arranged in the side wall of the tooling shell, an arc-shaped protrusion is fixedly connected at the position of the wedge extrusion block in the inner wall of the rotating drum, the arc-shaped protrusion contacts the wedge-shaped extrusion block when following the rotation of the rotating drum, and provides an extrusion force to the wedge-shaped extrusion block toward the inner side of the tooling shell.

[0016] In a preferred embodiment, a lower plug-in cylinder is provided at the bottom of the tooling shell. When the tooling shell is docked with the wire-outlet base, the lower plug-in cylinder is inserted into the inside of the wire-outlet base, and a cylindrical space is formed between the lower plug-in cylinder and the inner wall of the wire-outlet base. An annular piston is slidably installed on the outside of the lower plug-in cylinder. The annular piston forms a piston structure in the above-mentioned cylindrical space, and multiple sealing rings are provided above the annular piston.

[0017] In a preferred embodiment, an extrusion sheet is provided between two adjacent sealing rings, the inner edge of the sealing ring extends to the sealing ring, the sealing ring is a hollow structure, and the cross-sectional shape of the sealing ring when naturally stretched is an ellipse.

[0018] The beneficial effects of the present invention are as follows: the transformer test fixture with pot-type insulator outlets of the present invention meets the requirements of the test output end of such transformers, can be used for standardized design, can be reused on products of the same voltage level, can meet the requirements of the low-voltage end common box outlets, and is not affected by the installation time, space, and connection structure of the transformer body, so that the transformer with pot-type insulator outlets does not need to consider the requirements of the air insulation level when designing the high-voltage outlets, thereby reducing the use cost and time cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the detection system of the present invention.

[0020] Figure 2 It is a schematic diagram of the state of the detection tooling on the transformer to be tested after being connected to each other during the detection of the present invention.

[0021] Figure 3 It is a structural schematic diagram of one type of high-voltage test and detection tooling of the present invention.

[0022] Figure 4 It is a structural schematic diagram of one kind of low-pressure test detection tooling of the present invention.

[0023] Figure 5 It is a structural schematic diagram of one kind of neutral point test detection tooling of the present invention.

[0024] Figure 6 It is a structural schematic diagram of another high-voltage test and detection tooling of the present invention.

[0025] Figure 7 It is a structural schematic diagram of another low-voltage test detection tooling of the present invention.

[0026] Figure 8 It is a structural schematic diagram of another neutral point test detection tooling of the present invention.

[0027] Fig. 9 It is a schematic diagram of the docking installation between one of the tooling housings and the outlet base of the present invention.

[0028] Fig.10 The improved docking mode between the tool housing and the outlet base of the present invention.

[0029] Fig.11 It is a schematic diagram of the docking installation between the improved tool housing and the outlet base of the present invention.

[0030] Fig.12 It is a schematic diagram of the buckling state between the buckling plate and the base flange of the present invention.

[0031] Fig.13It is a bottom view of the buckling plate of the present invention before being buckled.

[0032] Fig.14 It is a bottom view of the buckling plate of the present invention after buckling.

[0033] Fig.15 This is a diagram showing the matching state between the internal transmission gear and the arc-shaped rack of the drum of the present invention.

[0034] Fig.16 This is a schematic diagram of the locking assembly added to the present invention.

[0035] Fig.17 It is a schematic diagram of the overall structure of the buckle plate of the present invention.

[0036] Fig.18 This is a schematic diagram of the improved sealing assembly of the present invention.

[0037] Fig.19 It is a schematic diagram of the pressurized state of the sealing assembly when the air pressure in the tool housing is increased according to the present invention.

[0038] The accompanying drawings are marked as follows: 1. Testing host; 2. Test and detection tooling; 201. High-voltage test and detection tooling; 202. Low-voltage test and detection tooling; 203. Neutral point test and detection tooling; 21. Tooling housing; 211. Arc rack; 212. Piston chamber; 213. Lower plug-in cylinder; 22. Test sleeve; 23. Internal plug-in connection conductor; 24. Gas charging and discharging valve seat; 25. Gas pressure gauge; 3. Test bench; 31. Test bench guide rail; 4. Transformer to be tested; 41. Basin outlet structure; 411. High-voltage outlet structure; 412. Low-voltage outlet structure; 413. Neutral point outlet structure; 401, outlet basin; 402, outlet base; 403, base flange; 5, operating robot; 51, robot guide rail; 6, positioning and fixing assembly; 61, sleeve; 62, rotating drum; 621, arc-shaped protrusion; 63, snap-fit ​​plate; 631, rotating shaft; 632, ramp; 64, transmission gear; 65, locking block; 651, latching tooth; 66, piston plate; 67, pin; 7, sealing assembly; 71, sealing ring; 711, pressure ring; 712, wedge-shaped extrusion block; 72, sealing ring; 721, annular piston; 722, extrusion sheet. DETAILED DESCRIPTION

[0039] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0040] Refer to the instruction manual Figures 1 to 19A transformer test fixture with a pot-type insulator outlet includes a detection host 1 and a detection platform 3, the detection platform 3 is used to carry a transformer 4 to be tested, and a pot outlet structure 41 is arranged on the transformer 4 to be tested, wherein the pot outlet structure 41 includes a high-voltage outlet structure 411, a low-voltage outlet structure 412 and a neutral point outlet structure 413, and the high-voltage outlet structure 411, the low-voltage outlet structure 412 and the neutral point outlet structure 413 are all composed of an outlet pot 401, and the outlet pot 401 is installed in a corresponding outlet base 402 on the transformer 4 to be tested;

[0041] The detection host 1 is provided with a test and detection tool 2, which includes a high-voltage test and detection tool 201, a low-voltage test and detection tool 202, and a neutral point test and detection tool 203, etc., which are used for test and detection connection. Among them, the high-voltage test and detection tool 201, the low-voltage test and detection tool 202, and the neutral point test and detection tool 203 are used to connect with the high-voltage outlet structure 411, the low-voltage outlet structure 412, and the neutral point outlet structure 413, respectively, and perform high-voltage test, low-voltage test, and neutral point test respectively (if other tests and inspections are required, other corresponding test and detection tools can be set according to needs);

[0042] Refer to the instruction manual Figures 3 to 8 , the high-voltage test and detection tooling 201, the low-voltage test and detection tooling 202 and the neutral point test and detection tooling 203 are all composed of a tooling housing 21, a test bushing 22 and an internal plug-in connection conductor 23, wherein the tooling housing 21 is used for docking and installation with the outlet base 402 of each basin outlet structure 41, and the test bushing 22 is fixedly installed on the tooling housing 21, and an internal plug-in connection conductor 23 is arranged inside the tooling housing 21, and the internal plug-in connection conductor 23 is plug-in connected to the outlet basin 401, wherein the tooling housing 21 and the test bushing 22 have the same bushing outlet structure and configuration as those in a normal transformer with a bushing, except that the internal plug-in connection conductor 23 and the tooling housing 21 can be disassembled and assembled with the transformer 4 to be tested, so as to be disassembled after the test is completed;

[0043] Among them, in order to achieve the insulation requirements in the test sleeve 22, the present application fills the tooling shell 21 and the test sleeve 22 with protective gas after the tooling shell 21 is connected to the outlet base 402, that is, the tooling shell 21 is provided with a charging and discharging valve seat 24 and a gas pressure gauge 25 (wherein the charging and discharging valve seat 24 is a three-way valve seat with one end connected to the shell, one end connected to the gas pressure gauge 25, and one end reserved for charging and discharging), and the charging and discharging valve seat 24 is connected to an insulating gas charging device, that is, an insulating gas bottle and an air pump. Among them, this embodiment preferably uses SF6 insulated Insulating gas, that is, the test bushing 22 uses SF6-air bushing. One end of the test bushing 22 is connected to the outlet basin 401 in the tooling shell 21 through the internal plug-in connecting conductor 23, and the other end is exposed to the air and connected to the test equipment. During the docking installation, SF6 insulating gas is first filled into the tooling shell 21, and the air is exhausted. Then, after the docking is sealed, the insulating gas is continued to be filled, and the gas pressure is detected by the gas pressure gauge 25, and then controlled by the filling and discharging valve seat 24, so that the pressure in the tooling shell 21 reaches the rated pressure to meet the internal insulation level requirements.

[0044] It should be noted that the tests on the transformer referred to in this application are all routine tests. For example, after the transformer is manufactured, a series of tests need to be carried out to ensure that its performance meets the design requirements. These tests include high-voltage tests (also called withstand voltage tests), low-voltage tests, and neutral point tests. Among them, the high-voltage test is mainly used to test the insulation performance of the transformer to ensure that insulation breakdown does not occur under normal operating conditions, thereby ensuring the safe and reliable operation of the equipment. The detection method is to apply an AC or DC voltage higher than the normal operating voltage to the primary side of the transformer for a period of time to observe whether there is discharge or breakdown. The test voltage is usually several times the working voltage, and the specific value is determined according to relevant standards.

[0045] The low voltage test is mainly to detect the basic electrical parameters of the transformer, such as voltage ratio, no-load current, short-circuit loss, etc., to verify whether the transformer meets the design requirements. The detection method is the voltage ratio measurement method, that is, applying the rated voltage on the low voltage side, measuring the output voltage on the high voltage side, and calculating the difference between the actual voltage ratio and the theoretical value.

[0046] For the neutral point test, that is, relative to the three-phase transformer, when the neutral point is grounded, specific tests are required to evaluate the electrical characteristics of the neutral point, such as grounding resistance, insulation strength of the neutral point to the ground, etc. The detection method is the grounding resistance measurement method, that is, using a grounding resistance tester to directly measure the resistance value between the neutral point and the earth.

[0047] The above is a basic introduction to several common tests on transformers. In the actual operation process, it is also necessary to formulate and execute a detailed test plan based on specific national standards and industry specifications. Since the above actual test operations are all existing technologies and are performed by the detection host 1, this application will not explain the specific test operations in detail, but only explain the use and principle of the above tooling structure.

[0048] In the above embodiment, the tool housing 21 is manufactured according to the structure of the outlet basin structure 41 of the transformer 4 to be tested, and the test bushing 22 is purchased according to the voltage level requirements of each outlet basin structure 41. For example, the test bushing 22 of the high-voltage test and detection tooling 201 is purchased according to the high-voltage voltage level requirements, the test bushing 22 of the low-voltage test and detection tooling 202 is purchased according to the low-voltage voltage level requirements, and the test bushing 22 of the neutral point test and detection tooling 203 is purchased according to the neutral point voltage level requirements. The test bushing 22 is installed on the tool housing, one end of which is connected to the corresponding outlet basin 401 through the internal plug-in connecting conductor 23 (aluminum alloy conductor) in the tool housing 21, and the insulating medium SF6 is filled in the tool housing 21 to meet the internal insulation requirements. One end of the test bushing 22 is exposed to the air and connected to the corresponding test equipment on the detection host 1 during the test.

[0049] Therefore, the present application uses an aluminum alloy conductor designed into a plug-in structure as an internal connecting conductor connected to the outlet basin 401, thereby forming a reserved plug-in terminal (i.e., an internal plug-in connecting conductor 23) connected to the test bushing 22. The conductor is surrounded by a metal shell (i.e., a tooling shell 21) to support the test bushing 22, and the inside is filled with SF6 insulating medium to meet the insulation level requirements of the live body. In the actual design, aluminum alloy conductors, i.e., internal plug-in connecting conductors 23, are respectively made for the high and low voltages and the neutral point. One end of the internal plug-in connecting conductor 23 is bolted to match the installation size of the center insert of the outlet basin 401, and the other end of the plug-in interface matches the test bushing 22; the high and low voltages and the neutral point are respectively made with corresponding tooling shells 21. One end of the tooling shell 21 is connected to match the size of the outlet base 402 at the outlet basin 401, and the other end is bolted to match the installation size of the test bushing 22. An interface for installing the charging and discharging valve seat 24 is reserved on the outside of the shell. ; During the actual assembly, first assemble the subsequent test bushing 22, the internal plug-in connection conductor 23, the charging and discharging valve seat 24 and the gas pressure gauge 25 to form an integrated tooling structure, and then align the aluminum alloy conductors of each phase and install them on the corresponding center insert of the outlet basin; then install the metal tooling shell 21 of each phase on the outlet base 402 of the corresponding outlet basin 401, and pay attention to the angle during installation, which must meet the air insulation distance requirements after the test bushing 22 is installed; after washing, fill each tooling shell 21 with SF6 insulating gas to the rated pressure to meet the internal insulation level requirements

[0050] It should be noted that the test tooling provided in this embodiment has the following advantages:

[0051] 1. The transformer test fixture with pot-type insulator outlet of the present invention meets the requirements of the output end of such transformer test;

[0052] Second, the transformer test fixture with pot-type insulator outlet of the present invention can be used for standardized design and can be repeatedly used on products of the same voltage level;

[0053] 3. The transformer test fixture with pot-type insulator outlet of the present invention can meet the requirements of low-voltage end common box outlet;

[0054] Fourth, the transformer test fixture for the outlet of the pot-type insulator of the present invention is not affected by the installation time, space and connection structure of the transformer body;

[0055] 5. The transformer test fixture with pot-type insulator outlet of the present invention can eliminate the need to consider the air insulation level requirements when designing high-voltage outlets of such transformers. The air insulation distance requirements can be met by simply adjusting the installation angle of the test bushing 22 when designing the fixture, which can indirectly greatly reduce the outer dimensions of the transformer;

[0056] 6. The use of the transformer test tooling with pot-type insulator outlets of the present invention can eliminate the need to consider purchasing high and low voltage test bushings 22 during production of such transformers, thereby reducing use costs and time costs;

[0057] 7. The transformer test fixture with pot-type insulator outlet of the present invention adopts the connection mode of internal aluminum alloy conductor and reserves plug-in terminal, which is more reliable than the original lead connection mode and can achieve a simple installation mode without hand hole.

[0058] 8. The insulating medium inside the shell of the transformer test tooling with pot-type insulator outlets of the present invention is SF6 gas, which is more convenient and economical to charge, discharge, transport and store than transformer oil.

[0059] In the above embodiment, if the size of the transformer 4 to be tested is relatively large, the size of the corresponding test and detection tooling 2 is also relatively large. For the transformer 4 to be tested that has just been produced, an automated testing device can be used in the actual test, for example, referring to the attached manual. Figure 1, set up a testing room, set the testing host 1 and the test and detection tooling 2 in the testing room, and set up corresponding placement cabinets or placement racks, place the corresponding high-voltage test and detection tooling 201, low-voltage test and detection tooling 202 and neutral point test and detection tooling 203 accordingly, and set up an operating robot 5 for automated operation. At the same time, a testing table rail 31 and a robot rail 51 are also provided in the testing room. The testing table 3 is slidably set on the testing table rail 31, and the operating robot 5 is slidably set on the robot rail 51. Then, during the inspection, the transformer 4 to be tested and the operating robot 5 can be controlled to move. After the operating robot 5 automatically operates the test and detection tooling 2 to be connected and installed with the corresponding basin outlet structure 41, the operating robot 5 can be controlled to leave the testing room to avoid impact during the inspection. At the same time, the testing table rail 31 can also be extended to the outside of the testing room so that the loading equipment can load the transformer 4 to be tested.

[0060] In the above embodiment, the outlet base 402 on the transformer 4 to be tested is preferably provided with a base flange 403 structure to achieve the connection of subsequent equipment. For this purpose, the tool housing 21 and the outlet basin 401 can also be connected by a bolt structure. However, in actual testing, due to the large number of test items and the large number of bushing tooling used, the efficiency will be affected if the traditional manual bolt flange is used for fixing. For this purpose, refer to the attached manual for details. Figures 10 to 15 , this embodiment also provides the following technical solutions. Specifically, a positioning and fixing component 6 is provided on the outside of the tooling shell 21. The positioning and fixing component 6 is provided corresponding to the base flange 403. The positioning and fixing component 6 includes a sleeve 61. The sleeve 61 is installed at the bottom of the tooling shell 21, and the sleeve 61 is arranged in a flared shape. The diameter value of the sleeve 61 at the position close to the bottom end face of the tooling shell 21 is the same as the diameter value of the base flange 403. At the same time, the bottom of the tooling shell 21 corresponds to the position of the bolt hole on the base flange 403. The pin 67 is fixedly connected, and then when the clamping tooling shell 21 is docked to the outlet base 402, the sleeve 61 forms a guide, so that the docking of the two is more accurate, thereby ensuring the effective docking of the internal plug-in connection conductor 23 on the outlet basin 401.

[0061] The positioning and fixing assembly 6 also includes a rotating drum 62, which is installed on the outside of the tooling shell 21, and a sleeve 61 is fixedly connected to the bottom of the rotating drum 62. A snap-fit ​​plate 63 is rotatably installed in the side wall of the sleeve 61. After the tooling shell 21 is docked with the outlet base 402, the snap-fit ​​plate 63 is located at the bottom of the base flange 403, and the snap-fit ​​plate 63 is rotated toward one side of the base flange 403 and moved to the bottom of the base flange 403 to contact and engage with the base flange 403, thereby fixing the tooling shell 21 and the outlet base 402.

[0062] Furthermore, the drum 62 is rotatably arranged on the outside of the tooling shell 21, and a rotating shaft 631 is fixedly connected to the buckling plate 63. A transmission gear 64 is fixedly connected to the top of the rotating shaft 631. The transmission gear 64 is rotatably arranged in the side wall of the drum 62. An arc-shaped rack 211 is fixedly connected to the position of the transmission gear 64 on the side wall of the tooling shell 21. Then, when the tooling shell 21 is docked on the outlet base 402, by rotating the drum 62, all the buckling plates 63 can be controlled to synchronously flip and snap into the bottom of the base flange 403. The operation is simple, making the docking installation of the test and detection tooling 2 more convenient. At the same time, under the premise that automatic operation is prohibited when using the operating robot 5, a rotation driving structure can be set on the end effector of the operating robot 5 (that is, the clamping claw for clamping each test and detection tooling 2). For example, teeth are set on the outside of the drum 62, and the drum 62 is rotationally driven by a motor and gears. If manual installation is adopted, a wrench-like structure can be used or the drum 62 can be directly controlled to rotate by hand to complete the installation. Fig.17 A slope 632 is provided on one side of the top wall of the snap-fit ​​plate 63, so that when flipping, the snap-fit ​​of the snap-fit ​​plate 63 at the bottom of the base flange 403 can be tightened from loose, thereby improving the convenience of operation.

[0063] In the above embodiment, since the test process needs to ensure absolute safety, the positioning and docking of the test and detection tooling 2 and the basin outlet structure 41 needs to ensure strict safety to avoid looseness during the test process. For this purpose, refer to the attached manual. Fig.16, this embodiment also provides the following technical solutions. Specifically, a piston cavity 212 is provided in the side wall of the tool housing 21 at a position corresponding to the rotating cylinder 62, a piston plate 66 is slidably installed in the piston cavity 212, the piston plate 66 slides laterally, a locking block 65 is fixedly connected to the outer side of the piston plate 66, an annular groove is provided at a position of the rotating cylinder 62 corresponding to the locking block 65, a slope structure is provided on the top of the locking block 65, the top of the annular groove in the rotating cylinder 62 is provided as a conical surface structure adapted to the slope structure of the locking block 65, a latch tooth 651 is provided between the slope structure of the locking block 65 and the conical surface structure, when the tool is When the air pressure in the housing 21 is low, the locking block 65 does not contact the annular groove, and the drum 62 can rotate normally. When the tooling housing 21 is docked, the buckle plate 63 is buckled with the base flange 403, and the insulating gas is filled into the tooling housing 21, the air pressure in the tooling housing 21 increases, and the piston plate 66 and the locking block 65 are pushed outward, so that the inclined surface structure of the locking block 65 contacts the top wall of the annular groove in the drum 62, and the locking teeth 651 between the two are locked with each other, and then the drum 62 is locked, ensuring that the test and inspection tool 2 can be stably installed on the transformer 4 to be tested during the test and inspection process. At the same time, because the buckle plate 63 is buckled with the outlet base 402 at the bottom of the outlet base 402, when the inclined surface structure of the locking block 65 contacts the annular groove in the drum 62, the lateral extrusion of the locking block 65 provides an upward extrusion force to the drum 62, and further pressure can be provided for the buckling of the buckle plate 63, making its installation more stable.

[0064] In the above-mentioned implementation manner, since each test and detection tool 2 needs to maintain a good quick disassembly and assembly function, and in actual testing, it needs to be frequently disassembled and assembled, which may easily cause damage to the seal, affecting the sealing effect of subsequent tests. In particular, during the test process, it is also necessary to simulate the external low-temperature and high-temperature environment for testing. The sealing structure is prone to aging and affects its own elasticity, thereby affecting the sealing effect. For this reason, this embodiment also provides the following technical solutions. For details, refer to the attached specification. Fig.18 and Fig.19A sealing assembly 7 is provided between the tool housing 21 and the outlet base 402. The sealing assembly 7 includes a sealing ring 71. An annular mounting groove is provided at the bottom of the tool housing 21 corresponding to the position of the base flange 403. The sealing ring 71 is installed in the annular mounting groove. The bottom of the sealing ring 71 contacts the top wall of the base flange 403. A pressing ring 711 is provided on the top of the sealing ring 71. The pressing ring 711 is slidably installed in the annular mounting groove. A wedge-shaped extrusion block 712 is provided at the position corresponding to the pressing ring 711 in the side wall of the tool housing 21. The wedge-shaped extrusion block 712 is provided at the position corresponding to the pressing ring 711. The pressure block 712 is laterally slidably arranged in the side wall of the tooling shell 21, and an arc-shaped protrusion 621 is fixedly connected to the position of the inner wall of the rotating cylinder 62 corresponding to the wedge-shaped extrusion block 712. The arc-shaped protrusion 621 gradually contacts the wedge-shaped extrusion block 712 as the rotating cylinder 62 rotates, and provides an extrusion force toward the inner side of the tooling shell 21 to the wedge-shaped extrusion block 712. The top of the sealing ring 71 cooperates with the wedge-shaped surface at the bottom of the wedge-shaped extrusion block 712, thereby providing a downward pressure on the pressure ring 711, making the sealing ring 71 tighter and improving the sealing effect.

[0065] In addition, the present embodiment also provides the following technical solutions: a lower insert cylinder 213 is provided at the bottom of the tooling shell 21; when the tooling shell 21 is docked with the outlet base 402, the lower insert cylinder 213 is inserted into the outlet base 402, and a cylindrical space is formed between the lower insert cylinder 213 and the inner wall of the outlet base 402; an annular piston 721 is slidably installed on the outside of the lower insert cylinder 213; the annular piston 721 forms a piston structure in the above-mentioned cylindrical space; a plurality of sealing rings 72 are provided above the annular piston 721; an extrusion sheet 722 is provided between two adjacent sealing rings 72; the inner edge of the sealing ring 71 extends to the sealing ring 72; the sealing ring 72 is a hollow structure; and the sealing ring 72 is an elliptical structure when naturally stretched without external force (in the figure, it is an extrusion deformation formed by pressure, and has become a nearly rectangular structure).

[0066] It should be noted that, after the tooling housing 21 is docked, insulating gas is filled into the tooling housing 21 to increase the internal air pressure of the tooling housing 21. When the gas pressure increases, the annular piston 721 is squeezed upward by the air pressure, thereby making the sealing ring 72 flatter, filling the space between the lower plug-in cylinder 213 and the outlet base 402 more tightly, and under the conduction of the extrusion sheet 722, each sealing ring 72 is deformed evenly, thereby providing an effective seal, and the greater the front pressure in the tooling housing 21, the better the sealing effect of the sealing ring 72, and no leakage will be formed. At the same time, since the rated pressure needs to be maintained in the tooling housing 21 during the test, no matter how the temperature of the simulated environment changes during the test, there is a certain pressure in the tooling housing 21, thereby ensuring the sealing effect of the sealing ring 72. Moreover, during the disassembly and assembly process, when the pressure in the tooling housing 21 is normal, the sealing ring 72 stretches normally without deformation, and the extrusion friction with the outlet base 402 is small, so the friction loss during use is small, further improving the service life of the equipment.

[0067] It should be noted that this embodiment only takes the exit inspection of the transformer after production is completed as an example, so the operating robot 5, the testing table 3 and the testing host 1 can all be set in the testing room. For the transformer that has been used, the operating robot 5 and other equipment such as the sealing assembly 7 can be integrated into a mobile device, such as a vehicle, to facilitate the transportation and transfer of the equipment. For scenes with large space constraints where it is not suitable to use a robot, the test and inspection tooling 2 can also be manually installed.

[0068] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention.

Claims

1. A transformer test tool for outlets of pot-type insulators, characterized in that: The invention comprises a testing host (1) and a testing platform (3), wherein the testing platform (3) is used to carry a transformer to be tested (4), and a basin outlet structure (41) is provided on the transformer to be tested (4), wherein the basin outlet structure (41) comprises an outlet basin (401), and the outlet basin (401) is installed in a corresponding outlet base (402) on the transformer to be tested (4); The detection host (1) is provided with a test and detection tool (2), the test and detection tool (2) comprising a tool housing (21), a test sleeve (22) and an internal plug-in connection conductor (23), the tool housing (21) being used for docking and installation with the outlet base (402) of each outlet structure (41), the test sleeve (22) being fixedly installed on the tool housing (21), the tool housing (21) being provided with an internal plug-in connection conductor (23), the internal plug-in connection conductor (23) being plug-in-connected to the outlet basin (401), and a positioning and fixing component (6) and a sealing component (7) being provided between the tool housing (21) and the outlet base (402); The tool housing (21) is provided with a gas charging and discharging valve seat (24) and a gas pressure gauge (25), and the gas charging and discharging valve seat (24) is connected to an insulating gas charging device; The outlet base (402) on the transformer (4) to be tested is provided with a base flange (403), the positioning and fixing assembly (6) is provided corresponding to the base flange (403), the positioning and fixing assembly (6) comprises a sleeve (61), the sleeve (61) is installed at the bottom of the tool housing (21), and the sleeve (61) is provided in a flared shape, the diameter value of the sleeve (61) at a position close to the bottom end surface of the tool housing (21) is the same as the diameter value of the base flange (403), and the bottom of the tool housing (21) corresponding to the bolt hole on the base flange (403) is fixedly connected with a pin (67); The positioning and fixing assembly (6) further comprises a rotating drum (62), wherein the rotating drum (62) is mounted on the outside of the tool housing (21), the sleeve (61) is fixedly connected to the bottom of the rotating drum (62), and a snap-fit ​​plate (63) is rotatably mounted in the side wall of the sleeve (61), and after the tool housing (21) is docked with the outlet base (402), the snap-fit ​​plate (63) is rotated toward one side of the base flange (403) and moved to the bottom of the base flange (403) to contact and engage with the base flange (403); The rotating drum (62) is rotatably arranged outside the tool housing (21); a rotating shaft (631) is fixedly connected to the buckle plate (63); a transmission gear (64) is fixedly connected to the top of the rotating shaft (631); the transmission gear (64) is rotatably mounted in the side wall of the rotating drum (62); an arc-shaped rack (211) is fixedly connected to the side wall of the tool housing (21) at a position corresponding to the transmission gear (64); the transmission gear (64) and the arc-shaped rack (211) are meshed with each other; A piston cavity (212) is provided in the side wall of the tool housing (21) at a position corresponding to the rotating cylinder (62), a piston plate (66) is slidably mounted in the piston cavity (212), the piston plate (66) slides transversely, a locking block (65) is fixedly connected to the outer side of the piston plate (66), an annular groove is provided at a position of the rotating cylinder (62) corresponding to the locking block (65), a slope structure is provided at the top of the locking block (65), the top of the annular groove in the rotating cylinder (62) is provided as a conical surface structure adapted to the slope structure of the locking block (65), a latching tooth (651) is provided between the slope structure of the locking block (65) and the conical surface structure, and when the air pressure in the tool housing (21) increases, the piston plate (66) pushes the locking block (65) outwards, so that the slope structure of the locking block (65) contacts the top wall of the annular groove in the rotating cylinder (62).

2. A transformer test fixture for pot-type insulator outlets according to claim 1, characterized in that: The pot outlet structure (41) comprises a high-voltage outlet structure (411), a low-voltage outlet structure (412) and a neutral point outlet structure (413); the high-voltage outlet structure (411), the low-voltage outlet structure (412) and the neutral point outlet structure (413) are all composed of an outlet pot (401); the test and detection tooling (2) comprises a high-voltage test and detection tooling (201), a low-voltage test and detection tooling (202) and a neutral point test and detection tooling (203); the high-voltage test and detection tooling (201), the low-voltage test and detection tooling (202) and the neutral point test and detection tooling (203) are all composed of a tooling housing (21), a test bushing (22) and an internal plug-in type connection conductor (23).

3. A transformer test fixture for outlet conductors of pot-type insulators according to claim 2, characterized in that: The test bench (3), the test host (1) and the test and detection tooling (2) are all located in the test room. The test host (1) is provided with a placement rack. The high-voltage test and detection tooling (201), the low-voltage test and detection tooling (202) and the neutral point test and detection tooling (203) are placed in the placement rack accordingly. An operating robot (5) is provided in the test room. The operating robot (5) is used to clamp the corresponding test and detection tooling (2) and install it on the corresponding basin outlet structure (41). The test room is also provided with a test bench guide rail (31) and a robot guide rail (51). The test bench (3) is slidably arranged on the test bench guide rail (31), and the operating robot (5) is slidably arranged on the robot guide rail (51).

4. A transformer test fixture for pot-type insulator outlets according to claim 3, characterized in that: The sealing assembly (7) comprises a sealing ring (71). An annular mounting groove is provided at a position of the bottom of the tooling housing (21) corresponding to the base flange (403). The sealing ring (71) is installed in the annular mounting groove. The bottom of the sealing ring (71) contacts the top wall of the base flange (403). A pressure ring (711) is provided at the top of the sealing ring (71). The pressure ring (711) is slidably installed in the annular mounting groove. The top of the sealing ring (71) cooperates with the wedge-shaped surface at the bottom of the wedge-shaped extrusion block (712). A wedge-shaped extrusion block (712) is arranged at a position corresponding to the pressure ring (711) in the side wall of the tooling shell (21); the wedge-shaped extrusion block (712) is arranged in the side wall of the tooling shell (21) for transverse sliding; an arc-shaped protrusion (621) is fixedly connected to a position corresponding to the wedge-shaped extrusion block (712) in the inner wall of the rotating cylinder (62); the arc-shaped protrusion (621) contacts the wedge-shaped extrusion block (712) when rotating with the rotating cylinder (62), and provides an extrusion force to the wedge-shaped extrusion block (712) toward the inner side of the tooling shell (21).

5. A transformer test fixture for outlet conductors with pot-type insulators according to claim 4, characterized in that: A lower insert cylinder (213) is provided at the bottom of the tool housing (21); when the tool housing (21) is docked with the outlet base (402), the lower insert cylinder (213) is inserted into the outlet base (402), and a cylindrical space is formed between the lower insert cylinder (213) and the inner wall of the outlet base (402); an annular piston (721) is slidably mounted on the outside of the lower insert cylinder (213); the annular piston (721) forms a piston structure in the above-mentioned cylindrical space, and a plurality of sealing rings (72) are provided above the annular piston (721).

6. A transformer test fixture for outlet conductors with pot-type insulators according to claim 5, characterized in that: An extrusion sheet (722) is provided between two adjacent sealing rings (72), the inner edge of the sealing ring (71) extends to the sealing ring (72), the sealing ring (72) is a hollow structure, and the cross-sectional shape of the sealing ring (72) when naturally stretched is an ellipse.

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