Electromagnetic test clamp for resistance test of 66kV circuit breaker and GIS (Gas Insulated Switchgear) equipment

Abstract

The invention relates to an electromagnetic test clamp for resistance testing of a 66kV circuit breaker and GIS equipment, and belongs to the technical field of high-voltage electrical equipment. The device comprises an electromagnetic adsorption clamp, an elastic contact is arranged on a clamping jaw of the electromagnetic adsorption clamp, the electromagnetic adsorption clamp is installed on an insulation operating rod, an angle adjusting mechanism is arranged on the upper portion of the insulation operating rod, a display screen is arranged on the lower portion of the insulation operating rod, and a sensor is arranged in the insulation operating rod. The sensor is electrically connected with the display screen and the electromagnetic adsorption clamp. According to the invention, a power grid worker can rapidly and safely carry out a resistance test, continuous power supply and stable operation of a power grid are ensured, the operation and maintenance cost is reduced, and the working efficiency is improved.

Description

Technical Field

[0001] The invention relates to the field of high voltage electrical testing, and in particular to an electromagnetic test clamp used for resistance testing of 66kV circuit breakers and GIS equipment. Background Art

[0002] In the field of high-voltage electrical equipment operation and maintenance, the loop resistance test of circuit breakers and gas insulated switchgear (GIS) with voltage levels of 66kV and above is a core test item for evaluating the integrity of the equipment's conductive loop and discovering poor contact defects. However, traditional testing methods and tools have significant technical bottlenecks and safety hazards in actual engineering applications, which seriously restricts test efficiency and accuracy.

[0003] Traditional loop resistance testing mostly uses a mechanical clamp structure, which clamps the conductor by manual force, resulting in unstable contact resistance, which can easily cause falsely high contact resistance or data jumps, and low operating efficiency. In addition, the metal parts of the clamp are prone to discharge in a high electric field environment, especially in a high humidity or dirty environment, which may trigger partial discharge or even flashover accidents, threatening the safety of testers.

[0004] In order to overcome this problem, the field has been exploring fast and stable solutions for 66kV circuit breakers and GIS equipment resistance testing. However, due to the particularity and safety requirements of high-voltage electrical tests, it is a huge challenge to develop a device that can meet actual operation needs and ensure the safety of personnel and equipment.

[0005] At present, although there are some auxiliary tools for high-voltage equipment resistance testing on the market, there are still many deficiencies in structure, function and ease of use. For example, traditional clamps cannot be adapted due to structural rigidity, and it is often necessary to polish the anti-rust paint on the surface of the equipment to improve contact, which not only damages the anti-corrosion layer of the equipment, but may also lead to increased oxidation of the contact surface during long-term operation.

[0006] Therefore, traditional test tools have significant defects in contact stability, operating efficiency, insulation protection and environmental adaptability, and existing improvement solutions have not effectively solved the technical bottleneck in high-voltage scenarios. A new type of electromagnetic test clamp for 66kV circuit breakers and GIS equipment resistance testing is urgently needed. Summary of the invention

[0007] In view of the above problems, the present invention proposes an electromagnetic test clamp for resistance testing of 66kV circuit breakers and GIS equipment, which solves the technical problems of unstable contact resistance, high insulation risk and poor environmental adaptability existing in traditional testing tools.

[0008] To achieve the above object, the present invention adopts the following technical solutions: An electromagnetic test clip for resistance testing of 66 kV circuit breakers and GIS equipment, including an electromagnetic adsorption fixture. Elastic contacts are provided on the jaws of the electromagnetic adsorption fixture. The electromagnetic adsorption fixture is installed on an insulating operating rod. An angle adjustment mechanism is provided at the upper part of the insulating operating rod, and a display screen is provided at the lower part of the insulating operating rod. A sensor is built into the insulating operating rod, and the sensor is electrically connected to the display screen and the electromagnetic adsorption fixture.

[0009] Preferably, the elastic contacts are distributed in an array.

[0010] Preferably, the elastic contact includes a metal contact and a spring. A through hole is provided in the jaw accommodation cavity. The end of the metal contact extends out of the through hole. A groove is provided at the bottom end of the metal contact. The spring is arranged between the groove and the inner wall of the jaw accommodation cavity. A retaining ring is provided on the outer wall of the metal contact, and the retaining ring is restricted within the jaw accommodation cavity.

[0011] Preferably, the metal contact is made of beryllium bronze, and the surface of the metal contact is plated with a silver layer. After the metal contact shrinks, its exposed end can be retracted into the accommodation cavity.

[0012] Preferably, the insulating protective layer of the insulating operating rod is a double-layer insulating housing. The outer layer of the double-layer insulating housing is an epoxy resin layer, and the inner layer is a silicone rubber buffer layer. A copper mesh shielding layer is provided between the layers.

[0013] Preferably, a plug-in structure is adopted between the electromagnetic adsorption fixture and the insulating operating rod.

[0014] Preferably, the angle adjustment mechanism is that the upper and lower parts of the insulating operating rod are of a split structure. An upper limit gear disc is provided at the connection of the upper part of the insulating operating rod, and a lower limit gear disc is provided at the connection of the lower part of the insulating operating rod. The gear discs of the upper limit gear disc and the lower limit gear disc are correspondingly engaged and coaxially connected by bolts.

[0015] Preferably, a support plate is provided in the inner cavity of the insulating operating rod. A bearing frame is provided on the surface of the support plate. A hydraulic jack is provided on the top surface of the bearing frame. A buffer frame is provided on the top surface of the hydraulic jack. A hydraulic rod is provided on the bottom surface of the buffer frame, and a sensor body is provided on the bottom surface of the hydraulic rod.

[0016] Preferably, a first fixing plate is provided on the top surface of the hydraulic rod, and a second fixing plate is provided on the bottom surface of the hydraulic rod; a first fixing bolt is provided on the surface of the first fixing plate, and a second fixing bolt is provided on the surface of the second fixing plate; the hydraulic rod is fixedly connected to the bottom surface of the buffer frame through the first fixing plate and the first fixing bolt, and the hydraulic rod is fixedly connected to the sensor body through the second fixing plate and the second fixing bolt.

[0017] Preferably, there are two sets of the load-bearing frame and the buffer frame arranged axially symmetrically, and the sensor body is arranged between the load-bearing frame and the buffer frame.

[0018] The beneficial effects of the present invention are as follows: 1. The elastic contact heads are distributed in an array and can adapt to the uneven surface of the conductor.

[0019] 2. The electromagnetic adsorption clamp and the insulating operating rod adopt a plug-in structure, which can realize quick disassembly and replacement.

[0020] 3. The angle adjustment mechanism completes the angle adjustment by rotating the upper limit gear disk and the lower limit gear disk, and is locked by bolts, realizing the adjustable direction of the insulating operating rod.

[0021] 4. With the synergistic effect of the load-bearing frame, the hydraulic jack, the buffer frame and the hydraulic rod, when vibration occurs, the vibration is mainly absorbed and buffered by the load-bearing frame, the buffer frame and the hydraulic system. Since there is no direct rigid connection at the bottom of the sensor body, most of the vibration energy is difficult to be directly transmitted to the sensor body, effectively reducing vibration interference, ensuring that the sensor body is in a relatively stable working environment, and thus improving the measurement accuracy of the sensor.

[0022] 5. The display screen real-time feedbacks the contact force and the resistance value.

[0023] In summary, the present invention enables the power grid electrical test staff to quickly and safely conduct resistance tests, ensures the continuous power supply and stable operation of the power grid, reduces the operation and maintenance costs at the same time, improves the work efficiency, and can simply and quickly meet the test requirements of high-precision, high-efficiency and high-safety for high-voltage equipment above 66 kV. In addition, the device should also have good stability and durability, and can adapt to various complex power grid environments and operating conditions. Description of the Drawings

[0024] Figure 1 It is a schematic diagram of the overall device of the present invention; Figure 2 It is a partial structural schematic diagram of the elastic contact head of the present invention; Figure 3 It is a partial structural schematic diagram of the sensor installation of the present invention; Figure 4 It is a partial structural schematic diagram of the sensor and the hydraulic rod of the present invention.

[0025] Wherein: 1. Elastic contact; 2. Electromagnetic adsorption fixture; 3. Insulating operating rod; 4. Angle adjustment mechanism; 5. Display screen; 101. Metal contact; 102. Spring; 103. Retaining ring; 301. Support plate; 302. Load-bearing frame; 303. Buffer frame; 304. Sensor body; 305. Hydraulic jack; 306. Hydraulic rod; 307. First fixing plate; 308. First fixing bolt; 309. Second fixing plate; 310. Second fixing bolt. Specific embodiments

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Embodiment 1

[0027] As Figure 1-2 shown, an electromagnetic test clamp for resistance testing of 66 kV circuit breakers and GIS equipment includes an electromagnetic adsorption fixture 2. Elastic contacts 1 are arranged in an array on the jaws of the electromagnetic adsorption fixture. The electromagnetic adsorption fixture is installed on an insulating operating rod 3 by a plug-in structure. An angle adjustment mechanism 4 is provided on the upper part of the insulating operating rod 3, and a display screen 5 is provided on the lower part of the insulating operating rod 3. A sensor is built into the insulating operating rod 3, and the sensor is electrically connected to the display screen and the electromagnetic adsorption fixture.

[0028] The elastic contact includes a metal contact 101 and a spring 102. A through hole is provided in the jaw accommodating cavity. The end of the metal contact 101 extends out of the through hole. A groove is provided at the bottom end of the metal contact 101. The spring 102 is arranged between the groove and the inner wall of the jaw accommodating cavity. A retaining ring 103 is provided on the outer wall of the metal contact 101, and the retaining ring 103 is restricted within the jaw accommodating cavity; the metal contact is made of beryllium bronze, and the surface of the metal contact is plated with a silver layer. After the metal contact shrinks, its exposed end can be retracted into the accommodating cavity.

[0029] The insulating protective layer of the insulating operating rod is a double-layer insulating housing. The outer layer of the double-layer insulating housing is an epoxy resin layer, and the inner layer of the double-layer insulating housing is a silicone rubber buffer layer. A copper mesh shielding layer is provided between the layers.

[0030] The angle adjustment mechanism is that the upper and lower parts of the insulating operating rod are of a split structure. An upper limit gear disc is provided at the connection of the upper part of the insulating operating rod, and a lower limit gear disc is provided at the connection of the lower part of the insulating operating rod. The gear discs of the upper limit gear disc and the lower limit gear disc are correspondingly meshed and coaxially connected by bolts. Embodiment 2

[0031] The inner cavity of the insulating operating rod is provided with a support plate 301, and the surface of the support plate 301 is provided with a load-bearing frame 302, and the top surface of the load-bearing frame 302 is provided with a hydraulic jack 305, and the hydraulic jack 305 connects the load-bearing frame 302 and the buffer frame 303. When vibration occurs, the flow characteristics of the internal hydraulic oil are utilized to absorb and buffer most of the vibration energy through the movement of the piston. It is the main shock-absorbing component, which can effectively reduce the direct impact of vibration on the sensor body 304, and convert the strong vibration into the flow of hydraulic oil and the displacement of the piston, thereby protecting the sensor body 304 from the influence of large vibration. The top surface of the hydraulic jack 305 is provided with a buffer frame 303, and the buffer frame 303 cooperates with the hydraulic jack 305. After the force transmitted from the load-bearing frame 302 is initially buffered by the hydraulic jack 305, the force is then The hydraulic rod 306 is coordinated in one step to fine-tune the residual vibration. It provides an installation position for the hydraulic rod 306. The load-bearing frame 302 and the buffer frame 303 are arranged in two groups in an axially symmetrical manner. The bottom surface of the buffer frame 303 is provided with a hydraulic rod 306. The hydraulic rod 306 serves as a connection and fine-tuning function between the buffer frame 303 and the sensor body 304. When the residual vibration is initially buffered by the hydraulic jack 305, the hydraulic rod 306 stabilizes the position of the sensor body 304 through slight expansion and contraction, so as to avoid displacement or shaking of the sensor body 304 due to slight vibration, thereby ensuring the measurement accuracy of the sensor body 304. The sensor body 304 is provided on the bottom surface of the hydraulic rod 306. Under the protection of the above structure, the sensor body 304 is prevented from being disturbed by vibration, so that data can be accurately collected.

[0032] The sensor body 304 is arranged between the load-bearing frame 302 and the buffer frame 303. The top surface of the hydraulic rod 306 is provided with a first fixing plate 307, and the first fixing plate 307 is used to increase the connection area between the hydraulic rod 306 and the buffer frame 303 to make the connection more secure. The first fixing bolt 308 passes through the corresponding holes on the first fixing plate 307 and the buffer frame 303 to securely fix the hydraulic rod 306 to the bottom surface of the buffer frame 303, ensuring that the hydraulic rod 306 will not be relatively displaced with the buffer frame 303 during operation. The bottom surface of the hydraulic rod 306 is provided with a second fixing plate 309, and the second fixing plate 309 is used to connect the hydraulic rod 306 and the sensor body 304, the hydraulic rod 306 and the sensor body 304 are tightly fixed by the second fixing bolt 310, ensuring that the sensor body 304 can stably move with the extension and retraction of the hydraulic rod 306 and maintain its correct position in a vibration environment, the surface of the first fixing plate 307 is provided with a first fixing bolt 308, and the surface of the second fixing plate 309 is provided with a second fixing bolt 310, the hydraulic rod 306 is fixedly connected to the bottom surface of the buffer frame 303 through the first fixing plate 307 and the first fixing bolt 308, and the hydraulic rod 306 is fixedly connected to the sensor body 304 through the second fixing plate 309 and the second fixing bolt 310.

[0033] Once vibration occurs, the load-bearing frame 302 will first receive the vibration impact force and transmit it to the hydraulic jack 305 connected to its top surface. The hydraulic jack 305 responds quickly, and with the help of the flow characteristics of the internal hydraulic oil, it efficiently absorbs and buffers most of the vibration energy through piston movement, greatly reducing the direct impact of the vibration on the sensor body 304, and converts the strong vibration into the movement of oil and piston. The residual vibration after initial buffering is transmitted to the buffer frame 303. The buffer frame 303 cooperates with the hydraulic rod 306 on its bottom surface for further fine adjustment. The hydraulic rod 306 is slightly extended and retracted according to the vibration conditions to avoid displacement or shaking due to slight vibrations, so that the sensor body 304 can be accurately measured in a relatively stable environment.

[0034] The other structures are the same as those in Example 1.

[0035] Working principle of the present invention: When the DC power supply is turned on, the electromagnetic coil of the electromagnetic adsorption fixture is energized to generate magnetic flux lines, which form a closed magnetic circuit through the magnetic base and the pole piece. The clamping claw is brought close to the surface of the GIS busbar through the insulating operating rod and automatically adsorbed to the conductor. If there is a depression on the surface of the conductor, the elastic contact can achieve stable contact. The display screen displays the contact force, resistance value and coil temperature in real time.

[0036] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0037] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An electromagnetic test clip for resistance testing of 66 kV circuit breakers and GIS equipment, including an electromagnetic adsorption fixture, characterized in that, An elastic contact is provided on the jaw of the electromagnetic adsorption fixture. The electromagnetic adsorption fixture is installed on an insulating operating rod. An angle adjustment mechanism is provided on the upper part of the insulating operating rod, a display screen is provided on the lower part of the insulating operating rod, and a sensor is built in the insulating operating rod. The sensor is electrically connected to the display screen and the electromagnetic adsorption fixture.

2. The electromagnetic test clip for resistance testing of 66 kV circuit breakers and GIS equipment according to claim 1, characterized in that, The elastic contacts are distributed in an array.

3. An electromagnetic test clip for resistance testing of 66 kV circuit breakers and GIS equipment according to claim 1 or 2, characterized in that, The elastic contact includes a metal contact and a spring. A through hole is provided in the jaw accommodating cavity. The end of the metal contact extends out of the through hole. A groove is provided at the bottom end of the metal contact. The spring is arranged between the groove and the inner wall of the jaw accommodating cavity. A retaining ring is provided on the outer wall of the metal contact, and the retaining ring is restricted within the jaw accommodating cavity.

4. An electromagnetic test clip for resistance testing of 66 kV circuit breakers and GIS equipment according to claim 3, characterized in that, The metal contact is made of beryllium bronze material, and a silver plating layer is provided on the surface of the metal contact. After the metal contact shrinks, its exposed end can be retracted into the accommodating cavity.

5. An electromagnetic test clip for resistance testing of 66 kV circuit breakers and GIS equipment according to claim 1, characterized in that, The insulating protective layer of the insulating operating rod is a double-layer insulating housing. The outer layer of the double-layer insulating housing is an epoxy resin layer, the inner layer of the double-layer insulating housing is a silicone rubber buffer layer, and a copper mesh shielding layer is provided between the layers.

6. The electromagnetic test clip for resistance testing of 66 kV circuit breakers and GIS equipment according to claim 1, characterized in that A plug-in structure is adopted between the electromagnetic adsorption fixture and the insulating operating rod.

7. An electromagnetic test clip for the resistance test of a 66 kV circuit breaker and GIS equipment according to claim 1, characterized in that, The angle adjustment mechanism is such that the upper and lower parts of the insulating operating rod are of a split structure. An upper limit gear disc is provided at the connection of the upper part of the insulating operating rod, and a lower limit gear disc is provided at the connection of the lower part of the insulating operating rod. The gear discs of the upper limit gear disc and the lower limit gear disc are correspondingly meshed and coaxially connected by bolts.

8. An electromagnetic test clip for 66 kV circuit breaker and GIS equipment resistance test according to claim 1, characterized in that, A support plate is provided in the inner cavity of the insulating operating rod. A bearing frame is provided on the surface of the support plate. A hydraulic jack is provided on the top surface of the bearing frame. A buffer frame is provided on the top surface of the hydraulic jack. A hydraulic rod is provided on the bottom surface of the buffer frame. A sensor body is provided on the bottom surface of the hydraulic rod.

9. An electromagnetic test clip for resistance testing of 66 kV circuit breakers and GIS equipment according to claim 8, characterized in that A first fixing plate is provided on the top surface of the hydraulic rod, and a second fixing plate is provided on the bottom surface of the hydraulic rod; a first fixing bolt is provided on the surface of the first fixing plate, and a second fixing bolt is provided on the surface of the second fixing plate; the hydraulic rod is fixedly connected to the bottom surface of the buffer frame through the first fixing plate and the first fixing bolt, and the hydraulic rod is fixedly connected to the sensor body through the second fixing plate and the second fixing bolt.

10. An electromagnetic test clip for the resistance test of a 66 kV circuit breaker and GIS equipment according to claim 8, characterized in that, Two groups of the bearing frame and the buffer frame are arranged axially symmetrically, and the sensor body is arranged between the bearing frame and the buffer frame.

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