Airtight test tool for current transformer of GIS

Abstract

The utility model belongs to current transformer production technical field discloses a current transformer airtight test frock for GIS, including support base, the top of support base is installed with the rack for placement through the elevating assembly, both ends of support base all are fixedly installed with the vertical seat, all are installed with the compression assembly on two vertical seats, the moving end of two compression assemblies all are installed with the compression disc, one of compression discs is fixedly connected with the gas pipe, the communication hole that is linked together with gas pipe is opened to the compression disc, is installed with pressure sensor on the gas pipe, the utility model discloses the rack for placement, compression assembly, elevating assembly cooperation compression disc, gas pipe and pressure sensor are set up, first by the rack for placement elevating of jacking electric jar drive, then by compression assembly and push the compression disc compression transformer both ends, form sealed space, finally through the gas pipe and import test gas to sealed space, and pressure sensor real -time monitoring pressure change, realize the accurate detection to the airtightness of transformer gas chamber shell.

Description

Technical Field

[0001] This utility model relates to the field of current transformer manufacturing technology, and in particular to a gas tightness test fixture for current transformers used in GIS. Background Technology

[0002] GIS (Gas Insulated Switchgear) is a highly integrated power equipment that encloses circuit breakers, disconnectors, grounding switches, busbars, current transformers, voltage transformers, surge arresters, and other devices within a metal casing. It uses sulfur hexafluoride (SF6) gas at a certain pressure as insulation, significantly reducing the footprint. However, due to the internal pressure, the airtightness of the gas chamber casing is crucial. As a component of GIS, the current transformer also requires a high degree of airtightness in its gas chamber casing. If the gas chamber casing of the current transformer has leaks caused by casting, welding, or assembly processes, resulting in an excessive SF6 gas leakage rate for the entire GIS, it will severely impact the later use and maintenance of the GIS.

[0003] To address this, a gas tightness test fixture for current transformers used in GIS is proposed. Utility Model Content

[0004] The purpose of this invention is to provide a gas tightness test fixture for current transformers used in GIS, thereby solving or at least alleviating one or more of the above-mentioned problems and other problems existing in the prior art.

[0005] To achieve the above objectives, the main technical solutions adopted by this utility model include:

[0006] A GIS current transformer airtightness test fixture includes a support base, a placement rack for placing the GIS current transformer is installed on the top of the support base via a lifting assembly, uprights are fixedly installed at both ends of the support base, clamping assemblies are installed on both uprights, and pressure plates are installed on the moving ends of both clamping assemblies.

[0007] One of the pressure plates is fixedly connected to an air supply pipe, and the pressure plate has a connecting hole that communicates with the air supply pipe. A pressure sensor is installed on the air supply pipe.

[0008] In a GIS current transformer airtightness test fixture according to the present invention, a valve is fixedly installed on the gas supply pipe.

[0009] In a GIS current transformer airtightness test fixture according to the present invention, a connector is installed at the end of the air supply pipe away from the pressure plate.

[0010] According to the present invention, a GIS current transformer airtightness test fixture is provided, wherein the clamping assembly includes a clamping electric cylinder, the clamping electric cylinder is fixedly installed on the stand, a fixing plate is fixedly installed at the piston rod end of the clamping electric cylinder, the pressure plate is detachably installed on the fixing plate, a first guide sleeve is fixedly installed on the stand, a first guide rod is fixedly installed on the fixing plate, and the end of the first guide rod away from the fixing plate slides through the first guide sleeve.

[0011] In a GIS current transformer airtightness test fixture according to the present invention, the fixing plate is provided with a waist hole for connecting with the pressure plate.

[0012] According to the present invention, a GIS current transformer airtightness test fixture is provided, wherein the lifting assembly includes a lifting electric cylinder, the lifting electric cylinder is fixedly installed at the bottom of the support base, a second guide rod is fixedly installed at the bottom of the placement frame, a second guide sleeve is fixedly installed at the bottom of the support base, the lower end of the second guide rod slides through the second guide sleeve, and the top of the piston rod of the lifting electric cylinder is fixed at the bottom of the placement frame.

[0013] In a GIS current transformer airtightness test fixture according to the present invention, the placement frame is arranged in a V-shape.

[0014] In a GIS current transformer airtightness test fixture according to the present invention, a controller is fixedly installed on one of the uprights, and the clamping electric cylinder and the lifting electric cylinder are both electrically connected to the controller.

[0015] In a GIS current transformer airtightness test fixture according to the present invention, an alarm light is installed on the housing of the controller, and the pressure sensor is electrically connected to the controller.

[0016] In a GIS current transformer airtightness test fixture according to the present invention, a sealing ring is fixedly sleeved on the pressure plate.

[0017] This utility model has at least the following beneficial effects:

[0018] The system consists of a placement frame, a clamping assembly, a lifting assembly, a pressure plate, a gas supply pipe, and a pressure sensor. First, the lifting cylinder drives the placement frame to rise and fall to accommodate the height of current transformers for GIS of different specifications. Then, the clamping assembly pushes the pressure plate to clamp the two ends of the transformer, forming a sealed space. Finally, test gas is introduced into the sealed space through the gas supply pipe, and the pressure sensor monitors the pressure changes in real time to achieve accurate detection of the airtightness of the transformer's air chamber shell.

[0019] By setting up a controller and linking it with the clamping electric cylinder, the lifting electric cylinder and the alarm light, the precision control of the current transformer clamping and height matching can be achieved, as well as the intuitive feedback of the test results, which greatly reduces the reliance on manual labor and the difficulty of operation, and improves the efficiency of the test. Attached Figure Description

[0020] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 for Figure 1 A magnified structural diagram of part A in the diagram;

[0023] Figure 3 This is a schematic diagram of the lifting assembly of this utility model;

[0024] Figure 4 This is a schematic diagram of the structure of the clamping assembly of this utility model.

[0025] Explanation of icon numbers:

[0026] 1. Support base; 2. Placement rack; 3. Stand; 4. Pressure plate; 401. Sealing ring; 402. Connecting hole; 5. Pressing assembly; 501. Pressing electric cylinder; 502. Fixing plate; 503. Waist hole; 504. First guide rod; 505. First guide sleeve; 6. Gas pipe; 601. Valve; 602. Pressure sensor; 603. Connector; 7. Lifting electric cylinder; 701. Second guide rod; 702. Second guide sleeve; 8. Controller; 801. Alarm light. Detailed Implementation

[0027] The following will describe in detail the implementation of this application with reference to the accompanying drawings and embodiments, so that the implementation process of how this application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0028] Please refer to Figures 1 to 4 As shown, an embodiment of this utility model provides an airtightness test fixture for a GIS current transformer, including a support base 1. A placement rack 2 for placing the GIS current transformer is installed on the top of the support base 1 via a lifting assembly. Stands 3 are fixedly installed at both ends of the support base 1. A clamping assembly 5 is installed on each of the two stands 3. A pressure plate 4 is installed on the moving end of each of the two clamping assemblies 5. An air supply pipe 6 is fixedly connected to one of the pressure plates 4. A connecting hole 402 connected to the air supply pipe 6 is opened on the pressure plate 4. A pressure sensor 602 is installed on the air supply pipe 6.

[0029] By adopting the above technical solution, the support base 1 provides a stable support foundation for the entire tooling. The placement frame 2 can be height adjusted through the lifting component, which is used to support and drive the GIS current transformer to lift and lower, so as to adapt to the installation and testing requirements of transformers of different specifications. The uprights 3 at both ends of the support base 1 provide an installation carrier for the clamping component 5. The moving end of the clamping component 5 drives the pressure plate 4 to move towards the transformer, thereby clamping and fixing the two ends of the transformer. The gas supply pipe 6 on one of the pressure plates 4 is used to connect the test sulfur hexafluoride gas. The connecting hole 402 enables the gas supply pipe 6 to connect with the inside of the current transformer, so that the test gas can enter the inside of the current transformer. The pressure sensor 602 on the gas supply pipe 6 is used to detect the gas pressure inside the GIS current transformer connected to the gas supply pipe 6 in real time, thereby judging the airtightness of the GIS current transformer.

[0030] In this embodiment, a valve 601 is fixedly installed on the gas pipeline 6.

[0031] By adopting the above technical solution, the valve 601 fixedly installed on the gas pipeline 6 can realize the on-off control of the gas pipeline 6 passage; after the gas is filled to the specified pressure, closing the valve 601 can make the inside of the current transformer and the gas pipeline 6 form a closed space, which makes it easy for the pressure sensor 602 to detect pressure changes and thus determine whether the air tightness is qualified.

[0032] In this embodiment, a connector 603 is installed at the end of the gas supply pipe 6 away from the pressure plate 4.

[0033] By adopting the above technical solution, the connector 603 installed at the end of the gas supply pipe 6 away from the pressure plate 4 is used to realize the rapid and sealed connection between the gas supply pipe 6 and the external gas source pipeline, ensuring that the test gas can be stably and leak-freely introduced into the gas supply pipe 6 from the external gas source, and providing a gas source connection guarantee for the smooth conduct of the airtightness test.

[0034] In this embodiment, the clamping assembly 5 includes a clamping electric cylinder 501, which is fixedly mounted on the stand 3. A fixing plate 502 is fixedly mounted on the piston rod end of the clamping electric cylinder 501. The pressure plate 4 is detachably mounted on the fixing plate 502. A first guide sleeve 505 is fixedly mounted on the stand 3. A first guide rod 504 is fixedly mounted on the fixing plate 502. The end of the first guide rod 504 away from the fixing plate 502 slides through the first guide sleeve 505.

[0035] By adopting the above technical solution, the clamping cylinder 501 is fixedly installed on the stand 3 as the power source of the clamping assembly 5. The extension and retraction of its piston rod can drive the fixed plate 502 fixedly installed at the end to move linearly. The pressure plate 4 is detachably installed on the fixed plate 502, which is convenient for replacing the pressure plate 4 with a suitable one according to the different specifications of GIS current transformers. The first guide sleeve 505 on the stand 3 and the first guide rod 504 on the fixed plate 502 cooperate with each other. The end of the first guide rod 504 away from the fixed plate 502 slides through the first guide sleeve 505, which can guide and limit the movement direction of the fixed plate 502, ensuring that the pressure plate 4 can move smoothly and accurately towards the transformer and achieve clamping.

[0036] In this embodiment, the fixing plate 502 is provided with a waist hole 503 for connecting with the pressure plate 4.

[0037] By adopting the above technical solution, the waist hole 503 opened on the fixing plate 502 is used to connect with the pressure plate 4. The elongated structure of the waist hole 503 can provide a certain position adjustment margin when the pressure plate 4 is installed, which makes it easy to fine adjust the installation position of the pressure plate 4 on the fixing plate 502 according to the actual installation requirements, ensuring that the pressure plate 4 can accurately fit with the end face of the GIS current transformer and improve the sealing effect.

[0038] In this embodiment, a sealing ring 401 is fixedly sleeved on the pressure plate 4.

[0039] By adopting the above technical solution, the sealing ring 401 fixedly sleeved on the pressure plate 4 can fill the gap between the pressure plate 4 and the end face of the current transformer of GIS when the pressure plate 4 is pressed together, forming a sealing structure to prevent the test gas from leaking from the connection between the pressure plate 4 and the end face of the current transformer, ensuring the sealing of the closed space during the airtight test and improving the accuracy of the test results.

[0040] In this embodiment, the lifting assembly includes a lifting electric cylinder 7, which is fixedly installed at the bottom of the support base 1. A second guide rod 701 is fixedly installed at the bottom of the placement frame 2, and a second guide sleeve 702 is fixedly installed at the bottom of the support base 1. The lower end of the second guide rod 701 slides through the second guide sleeve 702, and the top of the piston rod of the lifting electric cylinder 7 is fixed to the bottom of the placement frame 2.

[0041] By adopting the above technical solution, the lifting electric cylinder 7 is fixedly installed at the bottom of the support base 1 as the power source of the lifting assembly. The extension and retraction of its piston rod can drive the placement frame 2 fixedly connected at the top to move up and down. The second guide rod 701 at the bottom of the placement frame 2 cooperates with the second guide sleeve 702 at the bottom of the support base 1. The lower end of the second guide rod 701 slides through the second guide sleeve 702, which can guide and limit the lifting direction of the placement frame 2, ensuring that the placement frame 2 drives the GIS current transformer to rise and fall smoothly and accurately, so as to match the pressing position of the pressure plate 4.

[0042] In this embodiment, the placement rack 2 is arranged in a V-shape.

[0043] By adopting the above technical solution, the V-shaped placement frame 2 utilizes the self-centering characteristic of the V-shaped structure to stably support the cylindrical GIS current transformer, so that the transformer can be automatically adjusted to the center position when placed on the placement frame 2, avoiding the transformer from shifting or rolling on the placement frame 2, ensuring that the pressure plate 4 can be accurately aligned with the end face of the transformer when it is pressed down, thus improving the positioning accuracy and stability of the tooling.

[0044] In this embodiment, a controller 8 is fixedly installed on one of the uprights 3, and the pressing electric cylinder 501 and the lifting electric cylinder 7 are both electrically connected to the controller 8.

[0045] By adopting the above technical solution, the controller 8 fixedly installed on one of the uprights 3 serves as the control core of the tooling. It forms an electrical connection with the clamping electric cylinder 501 and the lifting electric cylinder 7, which can realize the control of the extension and retraction of the piston rod of the clamping electric cylinder 501 and the extension and retraction of the piston rod of the lifting electric cylinder 7, thereby improving the ease of operation and control accuracy of the tooling.

[0046] In this embodiment, an alarm light 801 electrically connected to the controller 8 is installed on the housing of the controller 8, and a pressure sensor 602 is electrically connected to the controller 8.

[0047] By adopting the above technical solution, the pressure sensor 602 is electrically connected to the controller 8, which can transmit the gas pressure signal detected in the gas pipeline 6 in real time to the controller 8. The controller 8 analyzes and judges the pressure signal. When the pressure change value exceeds the preset threshold, that is, when the air tightness of the GIS current transformer is unqualified, the controller 8 controls the alarm light 801 installed on the housing to light up or flash, so as to promptly provide feedback to the operator that the air tightness test is unqualified, thereby improving the intuitiveness and efficiency of the test.

[0048] Working principle:

[0049] Placement of the current transformer: Place the current transformer for GIS to be tested smoothly on the V-shaped placement frame 2. Utilize the self-centering characteristic of the placement frame 2 to automatically align the current transformer with the center position and avoid deviation.

[0050] Height adaptation adjustment: The lifting cylinder 7 is started by the controller 8. The piston rod of the lifting cylinder 7 extends and retracts, which drives the placement frame 2 to rise and fall until the two end faces of the current transformer are aligned with the center height of the two pressure plates 4. Then the lifting cylinder 7 is turned off by the controller 8.

[0051] Tightening and sealing: The controller 8 starts the tightening electric cylinders 501 on the two uprights 3. The piston rod of the tightening electric cylinder 501 pushes the fixing plate 502 and the pressure plate 4 towards the transformer until the pressure plate 4 is tightly attached to the end faces of the transformer. The sealing ring 401 is compacted to form a sealing space.

[0052] Gas source connection: Connect the gas supply pipe 6 to the external sulfur hexafluoride gas source pipeline through the connector 603 at the end of the gas supply pipe 6 to ensure that there is no gas leakage at the connection.

[0053] Gas filling and pressure holding: Open valve 601 to introduce sulfur hexafluoride gas into the transformer until the preset test pressure is reached; after the pressure stabilizes, close valve 601 to form a closed space between the transformer and the gas supply pipe 6, and enter the pressure holding stage.

[0054] Air tightness detection and feedback: During the pressure holding process, the pressure sensor 602 detects the pressure signal in the gas supply pipe 6 in real time and transmits the signal to the controller 8; the controller 8 analyzes the pressure change. If the pressure change value is within the preset threshold, the air tightness is qualified, and the alarm light 801 remains off; if the pressure change value exceeds the preset threshold, there is a leak, and the controller 8 triggers the alarm light 801 to light up or flash to alert the operator.

[0055] Test completion procedure: After the test is completed, connect to the retraction tank through connector 603, open valve 601 to release the gas in the closed space, control the piston rod of the clamping electric cylinder 501 to retract through controller 8, release the pressure plate 4, then control the lifting electric cylinder 7 to drive the placement frame 2 to descend, and finally take out the current transformer to complete one airtightness test.

[0056] It should be noted that in this embodiment, the controller 8 is a Huichuan H3U-1614MR-XP controller, which supports two-channel pulse output or analog control and can directly drive the clamping electric cylinder 501 and the lifting electric cylinder 7 to meet the automation control requirements of dual actuators. It has four analog input interfaces, which can stably receive the pressure signal from the pressure sensor 602 without the need for an additional signal converter. It also has eight digital output interfaces, which can directly control the on / off / flashing of the alarm light 801 and provide flexible logic programming.

[0057] The pressure sensor 602 uses an SMC ISE30A-01-NL pressure sensor with a measurement range of 0-1.6MPa, covering the conventional pressure requirements for the airtightness test of current transformers for GIS, with a general test pressure of 0.1-1MPa and sufficient range redundancy.

[0058] The foregoing description illustrates and describes several preferred embodiments of the present invention. However, as previously stated, it should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the present invention's conception through the foregoing teachings or related technical or knowledge. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A fixture for airtight testing of current transformers for GIS, characterized in that, Includes a support base (1), and a placement rack (2) for placing GIS current transformers is installed on the top of the support base (1) via a lifting assembly. Both ends of the support base (1) are fixedly installed with uprights (3), and each of the two uprights (3) is equipped with a pressing assembly (5). Each of the two pressing assemblies (5) has a pressure plate (4) installed on its moving end. One of the pressure plates (4) is fixedly connected to an air supply pipe (6), and the pressure plate (4) has a connecting hole (402) that communicates with the air supply pipe (6). A pressure sensor (602) is installed on the air supply pipe (6).

2. The airtightness test fixture for a current transformer used in GIS according to claim 1, characterized in that: A valve (601) is fixedly installed on the gas pipeline (6).

3. The airtightness test fixture for a current transformer used in GIS according to claim 2, characterized in that: A connector (603) is installed at the end of the gas pipe (6) away from the pressure plate (4).

4. The airtightness test fixture for a current transformer used in GIS according to claim 1, characterized in that: The clamping assembly (5) includes a clamping electric cylinder (501), which is fixedly installed on the stand (3). A fixing plate (502) is fixedly installed on the piston rod end of the clamping electric cylinder (501). The pressure plate (4) is detachably installed on the fixing plate (502). A first guide sleeve (505) is fixedly installed on the stand (3). A first guide rod (504) is fixedly installed on the fixing plate (502). The end of the first guide rod (504) away from the fixing plate (502) slides through the first guide sleeve (505).

5. The airtightness test fixture for a current transformer used in GIS according to claim 4, characterized in that: The fixing plate (502) has a waist hole (503) for connecting with the pressure plate (4).

6. The airtightness test fixture for a current transformer for GIS according to claim 5, characterized in that: A sealing ring (401) is fixedly sleeved on the pressure plate (4).

7. The airtightness test fixture for a current transformer used in GIS according to claim 6, characterized in that: The lifting assembly includes a lifting electric cylinder (7), which is fixedly installed at the bottom of the support base (1). A second guide rod (701) is fixedly installed at the bottom of the placement frame (2), and a second guide sleeve (702) is fixedly installed at the bottom of the support base (1). The lower end of the second guide rod (701) slides through the second guide sleeve (702), and the top of the piston rod of the lifting electric cylinder (7) is fixed at the bottom of the placement frame (2).

8. The airtightness test fixture for a current transformer for GIS according to claim 7, characterized in that: The placement rack (2) is arranged in a V-shape.

9. The airtightness test fixture for a current transformer for GIS according to claim 8, characterized in that: A controller (8) is fixedly installed on one of the stands (3), and the clamping electric cylinder (501) and the lifting electric cylinder (7) are both electrically connected to the controller (8).

10. The airtightness test fixture for a current transformer for GIS according to claim 8, characterized in that: An alarm light (801) is installed on the housing of the controller (8), and the pressure sensor (602) is electrically connected to the controller (8).

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