Partial discharge fault characteristic test device for oil-immersed current transformer

Abstract

The invention belongs to the technical field of oil-immersed current transformers, and mainly relates to a partial discharge fault characteristic test device for an oil-immersed current transformer, which is characterized by comprising a placement box with a closed space inside and used for placing the current transformer; the positioning device is hoisted below the top plate of the placing box and is positioned in a horizontal plane through guide shafts in two directions; the distance measuring sensor can transversely and longitudinally move along with the positioning block and is used for monitoring the size change of the current transformer below the distance measuring sensor; the air pressure device is communicated with the interior of the placing box and is used for providing different gas environments; and the power distributor is connected with the current transformer in the placement box and is used for providing electric power. The size of the current transformer is monitored through double-shaft movement, flexibility and convenience are achieved, and data accuracy is high; different test environments are simulated, and research requirements of partial discharge fault characteristics of the oil-immersed current transformer under different gas conditions are met.

Description

Technical Field

[0001] This invention relates to oil-immersed current transformer technology, and more particularly to a test device for partial discharge fault characteristics of oil-immersed current transformers. Background Technology

[0002] Oil-immersed current transformers are core equipment in power systems used for current measurement, energy metering, and relay protection. They are completely immersed in insulating oil, which has insulation, heat dissipation, and arc-extinguishing functions, giving them high insulation strength, large capacity, and long lifespan. They are widely used in high-voltage power transmission and transformation systems. Among the common fault types in the use of oil-immersed current transformers, partial discharge, although the discharge amount is small, will gradually erode the insulation material over a long period of time. The temperature of the discharge area will rise, causing oil cracking and producing flammable gases. Partial discharge is an early sign of insulation degradation in oil-immersed current transformers and should be taken seriously.

[0003] However, existing technologies still have the following problems: Currently, it is necessary to use testing equipment to understand in advance the effects of partial discharge on oil-immersed current transformers, so as to facilitate timely and targeted maintenance by power personnel. Common partial discharge testing equipment for oil-immersed current transformers monitors the rise of the expansion coil, which requires the use of a distance sensor. When monitoring oil-immersed current transformers of different specifications, it is difficult to conveniently and quickly change the position of the distance sensor according to actual needs, resulting in poor versatility and affecting the accuracy of distance data. Furthermore, existing testing equipment lacks a complete pneumatic device. In actual operation, oil-immersed current transformers may be in environments with different concentrations of gas components, and existing technologies cannot easily reproduce these conditions, limiting the comprehensive study of equipment fault characteristics. Summary of the Invention

[0004] To address the above problems, this invention proposes a partial discharge fault characteristic test device for oil-immersed current transformers, which can flexibly monitor oil-immersed current transformers of different specifications, measure dimensional changes in a timely and accurate manner, and reproduce the gas environment under real conditions, making the test authentic and effective.

[0005] This application proposes a test device for partial discharge fault characteristics of an oil-immersed current transformer, characterized in that it includes: The placement box, with a sealed interior, is used to house the current transformer; The positioning device is suspended below the top plate of the placement box and positioned in the horizontal plane by guide shafts in two directions; A ranging sensor is installed on the positioning block of the positioning device and can move laterally and longitudinally with the positioning block to monitor the dimensional changes of the current transformer below. A pneumatic device, connected to the interior of the placement box, is used to provide different gas environments; The power distribution unit is connected to the current transformer inside the placement box and is used to provide power.

[0006] Furthermore, the positioning device also includes a guide box, a slider, and a motor. The guide box is divided into a first guide box and a second guide box, and the guide shaft is divided into a first guide shaft and a second guide shaft. The first guide shaft and the second guide shaft are vertically arranged in the horizontal plane, respectively rotatably installed in the first guide box and the second guide box, and connected to the motor. The second guide box is fixed below the top plate of the placement box. A guide rail groove is provided at the bottom of the second guide box. The slider is fixedly installed above the first guide box. The slider is rotatably sleeved outside the second guide shaft and extends out of the second guide box through the guide rail groove, so that the first guide box is suspended below the second guide box. A sliding groove is provided below the first guide box. The positioning block is sleeved on the outside of the first guide shaft and extends out of the first guide box through the sliding groove. The ranging sensor is installed at the lower end of the positioning block.

[0007] Furthermore, the first guide shaft and the positioning block are provided with a matching thread, and the second guide shaft and the slider are provided with a matching thread.

[0008] Furthermore, a positioning plate is installed at the bottom of the placement box, and multiple mounting holes are evenly provided on the surface of the positioning plate. Multiple positioning screws are inserted into the mounting holes closest to the current transformer at different positions to fix the current transformer.

[0009] Furthermore, the pneumatic device includes a pressure box, multiple gas controllers, an outlet pipe, a solenoid valve, and a gas regulating valve. The multiple gas controllers are installed inside the pressure box and are respectively connected to the outlet pipe. The gas regulating valve is installed below the pressure box, with one end connected to the outlet end of the outlet pipe and the other end connected to the inside of the placement box, for regulating the air pressure inside the placement box.

[0010] Furthermore, the gas controller is divided into an oxygen controller and a nitrogen controller.

[0011] Furthermore, the solenoid valve is installed at the outlet end of the gas outlet pipe to control the output of different gases.

[0012] Furthermore, the placement box is equipped with a sealing door, one side of which is rotatably connected to the placement box, and the other side is fixedly connected to an insertion plate. A locking device is provided on one side surface of the placement box. The locking device has an insertion groove on the side facing the sealing door. The insertion plate is inserted into the locking device through the insertion groove. The locking device and the insertion plate are connected by a locking hole. A screw is inserted into the locking hole to fix the insertion plate.

[0013] Furthermore, the device is also equipped with a controller, which is electrically connected to the pneumatic device to control the inflation and deflation of the pneumatic device.

[0014] A method for using the aforementioned oil-immersed current transformer partial discharge fault characteristic testing device, characterized by comprising the following steps: S001. Fix the current transformer inside the placement box and close and seal the placement box; S002. Adjust the air pressure device to change the air pressure and the content of different gas components in the placement box, start the power distributor, and begin the test; S003. Adjust the positioning device to move in the horizontal and vertical directions through the two guide shafts, thereby driving the ranging sensor to monitor the size of the local fault location of the current transformer.

[0015] The beneficial effects of this invention are as follows: (1) By setting a distance sensor and an adjustment mechanism, the position of the distance sensor can be changed as needed, thus making it suitable for monitoring the rise of different oil-immersed current transformer body expansion units. It has better versatility and more accurate distance data. The two guide shafts control the movement in different directions, driving the distance sensor to move to the required position. (2) By setting up a gas pressure device, the gas composition and pressure in the placement box can be adjusted according to the test requirements to simulate different test environments, meet the research needs of partial discharge fault characteristics of oil-immersed current transformer under different gas conditions, and have better practicality. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic flowchart of a partial discharge fault characteristic test device for an oil-immersed current transformer provided in this application embodiment; Figure 2 A schematic diagram of the structure of a partial discharge fault characteristic test device for an oil-immersed current transformer provided in this application embodiment; Figure 3 A schematic diagram of the positioning plate structure in a partial discharge fault characteristic test device for an oil-immersed current transformer provided in this application embodiment; Figure 4 A schematic diagram of the positioning device structure in a partial discharge fault characteristic test device for an oil-immersed current transformer provided in this application embodiment; Figure 5 A schematic diagram of the pneumatic device structure in a partial discharge fault characteristic test device for an oil-immersed current transformer provided in this application embodiment; 1. Placement box; 11. Positioning plate; 111. Mounting hole; 112. Positioning screw; 113. Gasket; 12. Sealing door; 121. Insertion plate; 13. Locking device; 131. Insertion groove; 132. Locking hole; 2. Positioning device; 21. Guide box; 211. First guide box; 212. Second guide box; 213. Sliding groove; 214. Guide rail groove; 22. Guide shaft; 221. First guide shaft; 222. Second guide shaft; 23. Slider; 24. Positioning block; 25. Motor; 3. Distance measuring device; 4. Air pressure device; 41. Air pressure box; 42. Gas controller; 421. Oxygen controller; 422. Nitrogen controller; 43. Gas outlet pipe; 44. Solenoid valve; 45. Gas regulating valve; 5. Power distributor; 6. Current transformer; 7. Controller. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. All other implementations obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application. In the various drawings, the same elements are represented by the same or similar reference numerals, and for clarity, the various parts in the drawings are not drawn to scale.

[0019] See Figure 1-5As shown, this invention proposes a test device for the partial discharge fault characteristics of an oil-immersed current transformer, characterized by comprising: a placement box 1, the interior of which is a sealed space for placing the current transformer 6; a positioning device 2, suspended below the top plate of the placement box 1, positioned horizontally by guide shafts 22 in two directions; a distance sensor 3, mounted on the positioning block 24 of the positioning device 2, and movable laterally and longitudinally with the positioning block to monitor the dimensional changes of the current transformer 6 below; a gas pressure device 4, connected to the interior of the placement box 1, for providing different gas environments; and a power distributor 5, connected to the current transformer 6 inside the placement box 1, for providing power. In this embodiment, the placement box 1 has good sealing and pressure resistance to ensure that it can withstand changes in internal gas pressure during the test, while preventing external impurities from entering and affecting the test results. The positioning device 2 moves accurately in the horizontal plane, driving the ranging sensor 3 to precisely position the current transformer 6. This enables real-time and accurate monitoring of the dimensional changes of the current transformer 6 during the test, providing reliable data support for analyzing its partial discharge fault characteristics. The air pressure device 4 precisely controls the proportion of different gases entering the placement chamber 1, thereby simulating different gas environments to study the partial discharge fault characteristics of the current transformer 6 under different gas environments, thus meeting the requirements of different test conditions.

[0020] See Figure 3 As shown, specifically, a positioning plate 11 is installed at the bottom of the placement box 1. The surface of the positioning plate 11 is uniformly provided with a plurality of mounting holes 111. A plurality of positioning screws 112 are inserted at different positions into the mounting holes 111 closest to the current transformer 6, thus fixing the current transformer 11. In this embodiment, the arrangement of the plurality of mounting holes 111 provides flexible selection of fixing positions, ensuring that current transformers 6 of different sizes and shapes can be securely installed, effectively preventing measurement errors caused by vibration or displacement. Preferably, the positioning screws 112 have mating threads with the mounting holes 111; a washer 113 is installed below the positioning screw 112, and the positioning screw 112 passes through the hole in the washer 113.

[0021] See Figure 4As shown, specifically, the positioning device 2 further includes a guide box 21, a slider 23, and a motor 25. The guide box 21 is divided into a first guide box 211 and a second guide box 222, and the guide shaft 22 is divided into a first guide shaft 221 and a second guide shaft 222. The first guide shaft 221 and the second guide shaft 222 are vertically arranged in a horizontal plane and are rotatably installed in the first guide box 211 and the second guide box 212, respectively, and are connected to the motor 25. The second guide box 222 is fixed below the top plate of the placement box 1, and the bottom of the second guide box 222 is open. A guide rail groove 214 is provided, and the slider 23 is fixedly installed above the first guide box 211. The slider 23 is rotatably sleeved outside the second guide shaft 222 and extends out of the second guide box 212 through the guide rail groove 214, suspending the first guide box 211 below the second guide box 212. A sliding groove 213 is provided below the first guide box 211, and the positioning block 24 is sleeved outside the first guide shaft 221 and extends out of the first guide box 211 through the sliding groove 213. The distance measuring sensor 3 is installed at the lower end of the positioning block 24. Preferably, the first guide shaft 221 and the positioning block 23 are provided with matching threads, and the second guide shaft 222 and the slider 23 are provided with matching threads.

[0022] In this embodiment, the motor 25 drives the second guide shaft 222 to rotate, causing the slider 23 and the first guide box 211 to move horizontally along the second guide shaft 222; at the same time, the motor 25 can also drive the first guide shaft 221 to rotate, causing the positioning block 24 to move along the first guide shaft 221 in a direction perpendicular to the second guide shaft 222, so that the ranging sensor 3 can measure in the horizontal plane from two directions, thereby achieving more accurate location detection of the partial discharge fault position of the oil-immersed current transformer.

[0023] See Figure 5 As shown, specifically, the pneumatic device 4 includes a pressure box 41, multiple gas controllers 42, an outlet pipe 43, a solenoid valve 44, and a gas regulating valve 45. The multiple gas controllers 42 are installed inside the pressure box 41 and are respectively connected to the outlet pipe 43. The gas regulating valve 45 is installed below the pressure box 41, with one end connected to the outlet end of the outlet pipe 43 and the other end communicating with the interior of the placement box 1, used to regulate the gas pressure inside the placement box 1. In this embodiment, the solenoid valve 44 is installed on the outlet pipe 43 to control the flow of gas. Specifically, the gas controllers 42 are divided into an oxygen controller 421 and a nitrogen controller 422. Preferably, the device also includes a controller 7, which is electrically connected to the pneumatic device 4 to control the inflation and deflation of the pneumatic device 4.

[0024] See Figure 2 As shown, specifically, the placement box 1 is provided with a sealing door 12. One side of the sealing door 12 is rotatably connected to the placement box 1, and the other side is fixedly connected to an insertion plate 121. A locking device 13 is provided on one side surface of the placement box 1. The locking device 13 has an insertion groove 131 on the side facing the sealing door 12. The insertion plate 121 is inserted into the locking device 13 through the insertion groove 131. A locking hole 132 is provided at the connection between the locking device 13 and the insertion plate 121. A screw is inserted into the locking hole 132 to fix the insertion plate 121. Preferably, in this embodiment, the sealing door 12 is a magnetic door. The insertion plate 121 has a T-shaped structure, and the long end of the T-shape is inserted into the insertion groove 131.

[0025] A method for using the aforementioned oil-immersed current transformer partial discharge fault characteristic testing device, characterized by comprising the following steps: S001. Fix the current transformer 6 inside the placement box 1 and close and seal the placement box 1; S002. Adjust the air pressure device 4 to change the air pressure and the content of different gas components in the placement box 1, start the power distributor 5, and begin the test; S003. Adjust the positioning device 2, and move it in the horizontal and vertical directions through the two guide shafts 22 to drive the distance sensor 3 to monitor the size of the local fault location of the current transformer 6.

[0026] The working principle of this application is as follows: The oil-immersed current transformer 6 to be tested is placed on the positioning plate 11 inside the placement box 1, and the positioning screw is inserted into the mounting hole 111 for fixation. The oil-immersed current transformer body 6 can realize partial discharge faults. The sealing door 3 is closed, the insertion plate 9 is inserted into the insertion slot 131, and the screw fixes and seals the insertion plate 121. Based on the monitoring requirement of the expansion of the current transformer body 6, the target position to be reached by the ranging sensor 6 is determined, and the corresponding motor 25 is started. The motor 25 drives the guide shaft to rotate, so that the slider 23 fitted on the guide shaft 22 moves along the sliding groove 213. By controlling the movement in different directions by the first guide shaft 221 and the second guide shaft 222 respectively, the precise positioning of the ranging sensor 6 in the plane can be achieved. Open the solenoid valve 44 and adjust the gas pressure in the placement box 1 through the gas regulating valve 45 to reach the pressure value and gas environment required for the test, simulating different test environments; start the power distribution unit 5 on the top of the placement box 1 to provide the required power for the test and start the test on the partial discharge fault characteristics of the current transformer.

[0027] The beneficial effects of this invention are as follows: (1) By setting a distance sensor and an adjustment mechanism, the position of the distance sensor can be changed as needed, thus making it suitable for monitoring the rise of different oil-immersed current transformer body expansion units. It has better versatility and more accurate distance data. The two guide shafts control the movement in different directions, driving the distance sensor to move to the required position. (2) By setting up a gas pressure device, the gas composition and pressure in the placement box can be adjusted according to the test requirements to simulate different test environments, meet the research needs of partial discharge fault characteristics of oil-immersed current transformer under different gas conditions, and have better practicality.

[0028] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this application, it should be noted that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0029] In this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, without necessarily requiring or implying any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0030] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A test device for partial discharge fault characteristics of an oil-immersed current transformer, characterized in that, include: The placement box, with a sealed interior, is used to house the current transformer; The positioning device is suspended below the top plate of the placement box and positioned in the horizontal plane by guide shafts in two directions; A ranging sensor is installed on the positioning block of the positioning device and can move laterally and longitudinally with the positioning block to monitor the dimensional changes of the current transformer below. A pneumatic device, connected to the interior of the placement box, is used to provide different gas environments; The power distribution unit is connected to the current transformer inside the placement box and is used to provide power.

2. The test device for partial discharge fault characteristics of an oil-immersed current transformer according to claim 1, characterized in that, The positioning device also includes a guide box, a slider, and a motor. The guide box is divided into a first guide box and a second guide box, and the guide shaft is divided into a first guide shaft and a second guide shaft. The first guide shaft and the second guide shaft are vertically arranged in the horizontal plane, respectively rotatably installed in the first guide box and the second guide box, and connected to the motor. The second guide box is fixed below the top plate of the placement box. A guide rail groove is provided at the bottom of the second guide box. The slider is fixedly installed above the first guide box. The slider is rotatably sleeved outside the second guide shaft and extends out of the second guide box through the guide rail groove, so that the first guide box is suspended below the second guide box. A sliding groove is provided below the first guide box. The positioning block is sleeved on the outside of the first guide shaft and extends out of the first guide box through the sliding groove. The ranging sensor is installed at the lower end of the positioning block.

3. The oil-immersed current transformer partial discharge fault characteristic test device according to claim 2, characterized in that, The first guide shaft and the positioning block are provided with a matching thread, and the second guide shaft and the slider are provided with a matching thread.

4. The test device for partial discharge fault characteristics of an oil-immersed current transformer according to claim 1, characterized in that, The bottom of the placement box is equipped with a positioning plate, and the surface of the positioning plate is evenly provided with multiple mounting holes. Multiple positioning screws are inserted into the mounting holes closest to the current transformer at different positions to fix the current transformer.

5. The test device for partial discharge fault characteristics of an oil-immersed current transformer according to claim 1, characterized in that, The pneumatic device includes a pressure box, multiple gas controllers, an outlet pipe, a solenoid valve, and a gas regulating valve. The multiple gas controllers are installed inside the pressure box and are respectively connected to the outlet pipe. The gas regulating valve is installed below the pressure box, with one end connected to the outlet end of the outlet pipe and the other end connected to the inside of the placement box, for regulating the air pressure inside the placement box.

6. The test apparatus for partial discharge fault characteristics of an oil-immersed current transformer according to claim 5, characterized in that, The gas controller is divided into an oxygen controller and a nitrogen controller.

7. The test device for partial discharge fault characteristics of an oil-immersed current transformer according to claim 5, characterized in that, The solenoid valve is installed at the outlet end of the gas outlet pipe to control the output of different gases.

8. The test device for partial discharge fault characteristics of an oil-immersed current transformer according to claim 1, characterized in that, The placement box is equipped with a sealed door. One side of the sealed door is rotatably connected to the placement box, and the other side is fixedly connected to an insertion plate. A locking device is provided on one side surface of the placement box. The locking device has an insertion groove on the side facing the sealing door. The insertion plate is inserted into the locking device through the insertion groove. The locking device and the insertion plate are connected by a locking hole. A screw is inserted into the locking hole to fix the insertion plate.

9. The test device for partial discharge fault characteristics of an oil-immersed current transformer according to claim 1, characterized in that, The device is also equipped with a controller, which is electrically connected to the pneumatic device to control the inflation and deflation of the pneumatic device.

10. The method of using the oil-immersed current transformer partial discharge fault characteristic test device according to any one of claims 1-9, characterized in that, Includes the following steps: S001. Fix the current transformer inside the placement box and close and seal the placement box; S002. Adjust the air pressure device to change the air pressure and the content of different gas components in the placement box, start the power distributor, and begin the test; S003. Adjust the positioning device to move in the horizontal and vertical directions through the two guide shafts, thereby driving the ranging sensor to monitor the size of the local fault location of the current transformer.

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