High-voltage cabinet switch mechanical life test device based on hydraulic transmission

Abstract

The utility model discloses a high-voltage cabinet switch mechanical life test device based on hydraulic transmission, which comprises an oil tank, a transmission module and a driving detection module, and the transmission module comprises a hydraulic pump, a first filter, a temperature regulator, a flow valve, a first one-way valve, a two-position two-way solenoid valve and a two-position three-way solenoid directional valve. The high-voltage cabinet switch mechanical life test device based on hydraulic transmission disclosed by the utility model can be used for mechanical life tests of a load switch, an isolating switch and a grounding switch of a manual spring energy storage operating mechanism, and accords with the standard of GB1985-2014 High-Voltage Alternating Current Isolating Switch and Ground Switch, the operating handle can be replaced by an external power operating device, and the operating handle can be replaced by an external power operating device. Meanwhile, the labor cost can be greatly reduced, the test efficiency is greatly improved, and the test safety and the test reliability are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of high-voltage AC switch testing, and in particular relates to a high-voltage cabinet switch mechanical life testing device based on hydraulic transmission. Background Art

[0002] Type testing for high-voltage AC switchgear includes mechanical property measurement tests, which rigorously assess mechanical lifespan. Currently, a wide range of switchgear used in the power transmission and distribution sector includes load switches, disconnectors, and earthing switches. Each type of switchgear must undergo type testing in accordance with national standards.

[0003] The currently implemented national standard GB / T3906-2020, "3.6kV to 40.5kV AC Metal-Enclosed Switchgear and Controlgear," states in Section 7.102: For manually operated equipment, normal manual operating handles should be used for testing. Section 6.102.4 of GB1985-2014, "High-Voltage AC Disconnectors and Earthing Switches," stipulates that the mechanical life test should consist of 1000 operating cycles. Furthermore, for manually operated disconnectors and earthing switches, the operating handles can be replaced with external power operating devices for ease of testing. In this case, regardless of the external operating method, as long as the test method meets the standard requirements, it is acceptable. Specifically, the extended mechanical life test in Section 6.102.6 is divided into two levels: M1 and M2. M1-level disconnectors and / or earthing switches must undergo 3000 closing and opening cycles; M2-level disconnectors and / or earthing switches must undergo 10,000 closing and opening cycles. The predominant operating mechanism for load switches used in the power transmission and distribution sector is a manual-operated, spring-energy-storage mechanism, operated using the high-voltage cabinet's built-in electronic control system. Due to their practical usage, disconnectors and earthing switches are mostly operated with manual spring mechanisms. However, during life testing in laboratories, the number of life tests performed does not change depending on the type of operating mechanism. A simple calculation shows that 1000 mechanical life test cycles, calculated at a closing and opening frequency of two times per minute, would require at least eight hours of manual work. The extended mechanical life test time can be expected, requiring at least six to eight working days. Therefore, testing switchgear equipped with manual spring mechanisms requires significant manpower and time.

[0004] In addition, other traditional systems utilizing pneumatic and electric systems can partially achieve the aforementioned test functions. Research has found that pneumatic transmissions are mostly driven by cylinders, while electric transmissions are mostly driven by servo motors or lead screws. However, during forward and reverse rotation, the switch operating mechanism of a high-voltage switch exhibits a significant decrease in torque at the critical moment of closing and opening, and can even generate reverse pulling forces (caused by the energy storage spring on the switch "overshooting" the lock). This can lead to serious consequences, such as cylinder and electric cylinder pulls or lead screw breakage. The testing itself is designed to test lifespan, placing extremely high demands on the lifespan of the external system. Cylinders and electric cylinders generally have a lifespan of less than 100,000 cycles, and even with a switch operating torque requirement of ≤250 N·m, they cannot achieve fully stable and controllable output, failing to meet the requirements of traditional testing systems. Switch operating mechanisms with a transmission rotation angle exceeding 360° are also unsuitable for transmission using straight rods such as cylinders and hydraulic rods.

[0005] Therefore, further improvements are made to the above problems. Utility Model Content

[0006] The main purpose of the utility model is to provide a high-voltage cabinet switch mechanical life test device based on hydraulic transmission, which can be used for the mechanical life test of load switches, disconnectors, and earthing switches with manual spring energy storage operating mechanisms. It complies with the GB1985-2014 "High-voltage AC disconnectors and earthing switches" standard. The operating handle can be replaced by an external power operating device, which can greatly reduce labor costs, greatly improve test efficiency, and increase test safety and reliability.

[0007] To achieve the above objectives, the present invention provides a high-voltage cabinet switch mechanical life test device based on hydraulic transmission, comprising an oil tank, a transmission module and a drive detection module, wherein:

[0008] The transmission module includes a hydraulic pump, a first filter, a temperature regulator, a flow valve, a first one-way valve, a two-position two-way solenoid valve and a two-position three-way solenoid reversing valve, wherein the hydraulic pump is placed in the oil tank and is connected to an input end of the two-position three-way solenoid reversing valve through the first filter, the temperature regulator, the flow valve, the first one-way valve and the two-position two-way solenoid valve in sequence;

[0009] The drive detection module includes a first involute transmission gear (positive), a second involute transmission gear (negative) and a composite transmission shaft. The first output end of the two-position three-way electromagnetic reversing valve is connected to the input end of the first involute transmission gear through an input oil pipe, and the second output end of the two-position three-way electromagnetic reversing valve is connected to the input end of the second involute transmission gear through (another) input oil pipe. The composite transmission shaft is installed between the first involute transmission gear and the second involute transmission gear and the composite transmission shaft is used to insert handle key connectors of various types of switches. The output end of the first involute transmission gear and the output end of the second involute transmission gear are connected to the oil tank through the same output oil pipe, and the output oil pipe is equipped with a second filter.

[0010] As a further preferred technical solution of the above technical solution, the output end of the first one-way valve is further connected to the oil tank through a pressure gauge and an electromagnetic overflow valve.

[0011] As a further preferred technical solution of the above technical solution, the oil tank is equipped with an oil temperature sensor and an oil level sensor.

[0012] As a further preferred technical solution of the above technical solution, the oil tank is installed on the jacking platform and the jacking platform is installed on the equipment platform through the hydraulic cylinder, and the equipment platform is installed with a sample fixing belt.

[0013] As a further preferred technical solution of the above technical solution, the output end of the first filter is connected to the hydraulic cylinder through a first stop valve (oil inlet), and the oil tank is connected to the hydraulic cylinder through a second one-way valve and a second stop valve (oil return). BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the results of a hydraulically driven high-voltage cabinet switch mechanical life test device of the present invention.

[0015] The reference numerals in the figures include: 1. hydraulic pump; 2. second stop valve (return oil); 3. first stop valve (inlet oil); 4. second one-way valve; 5. first filter; 6. temperature regulator; 7. flow valve; 8. first one-way valve; 9. two-position two-way solenoid valve; 10. two-position three-way solenoid reversing valve; 11. input oil pipe; 12. first involute transmission gear (forward); 13. second involute transmission gear (reverse); 14. compound transmission shaft; 15. pressure gauge 16 electromagnetic overflow valve; 17. second filter; 18. oil temperature sensor; 19. oil level sensor; 20 oil tank; 21. lifting platform; 22 hydraulic cylinder; 23 equipment platform; 24. specimen fixing belt. DETAILED DESCRIPTION

[0016] The following description is intended to disclose the present invention and enable those skilled in the art to implement the present invention. The preferred embodiments described below are provided for illustrative purposes only, and those skilled in the art will readily appreciate other obvious variations. The basic principles of the present invention as defined in the following description may be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0017] The utility model discloses a hydraulically driven high-voltage cabinet switch mechanical life test device. The specific embodiments of the utility model will be further described below in conjunction with preferred embodiments.

[0018] In the embodiments of the present invention, those skilled in the art will note that the high-voltage cabinet switch and the like involved in the present invention may be regarded as prior art.

[0019] Preferred embodiment.

[0020] like Figure 1 As shown, the utility model discloses a high-voltage cabinet switch mechanical life test device based on hydraulic transmission, including an oil tank 20, a transmission module and a drive detection module, wherein:

[0021] The transmission module includes a hydraulic pump 1, a first filter 5, a temperature regulator 6, a flow valve 7, a first one-way valve 8, a two-position two-way solenoid valve 9 and a two-position three-way solenoid reversing valve 10. The hydraulic pump 1 is placed in the oil tank 20 and is connected to the input end of the two-position three-way solenoid reversing valve 10 through the first filter 5, the temperature regulator 6, the flow valve 7, the first one-way valve 8 and the two-position two-way solenoid valve 9 in sequence;

[0022] The drive detection module includes a first involute transmission gear 12 (forward), a second involute transmission gear 13 (reverse) and a compound transmission shaft 14. The first output end of the two-position three-way electromagnetic reversing valve 10 is connected to the input end of the first involute transmission gear 12 through an input oil pipe 11, and the second output end of the two-position three-way electromagnetic reversing valve 10 is connected to the input end of the second involute transmission gear 13 through (another) input oil pipe 11. The compound transmission shaft 14 is installed between the first involute transmission gear 12 and the second involute transmission gear 13 and the compound transmission shaft 14 is used to insert handle key connectors of various types of switches. The output end of the first involute transmission gear 12 and the output end of the second involute transmission gear 13 are connected to the oil tank 20 through the same output oil pipe, and the output oil pipe 20 is installed with a second filter 17.

[0023] Specifically, the output end of the first one-way valve 8 is also connected to the oil tank 20 through a pressure gauge 15 and an electromagnetic overflow valve 16 .

[0024] More specifically, the oil tank 20 is equipped with an oil temperature sensor 18 and an oil level sensor 19 .

[0025] Furthermore, the oil tank 20 is installed on the jacking platform 21 and the jacking platform 21 is installed on the equipment platform 23 through the hydraulic cylinder 22 , and the equipment platform 23 is installed with a sample fixing belt 24 .

[0026] Furthermore, the output end of the first filter 5 is connected to the hydraulic cylinder 1 through the first stop valve 3 (oil inlet), and the oil tank 20 is connected to the hydraulic cylinder 1 through the second one-way valve 4 and the second stop valve 2 (oil return).

[0027] For this utility model:

[0028] The hydraulic pump 1 takes in oil from the oil tank 20 and delivers oil that meets the transmission requirements through the filter 5 and the temperature regulator 6. The flow valve 7 controls the oil inlet speed, the single-phase valve 8 prevents the oil from flowing back, the two-position two-way solenoid valve 9 controls the oil feed and interruption, and the two-position three-way solenoid valve 10 controls the oil flow direction. The oil is delivered through the oil pipe 11, etc., so that the involute transmission gear 12 or 13 generates forward and reverse rotation respectively, driving the composite transmission shaft 14. The head of the composite transmission shaft 14 can be plugged with handle key connectors of various types of switches to achieve matching of various models, so as to carry out life testing;

[0029] After passing through transmission gears 12 or 13, the oil returns to the oil tank. The return oil pipe is inserted below the oil level in the tank to prevent air from entering. This maintains a vacuum (full oil) in the pipe during reverse motion, ensuring a rapid transmission response. Filter 17 prevents impurities in the oil from entering the transmission gears after reverse motion and causing damage. A pressure gauge 15 displays and generates a pressure signal. A solenoid relief valve 16 overflows to balance excess oil. An oil temperature sensor 18 provides feedback on the oil temperature, and an oil level sensor 19 provides feedback on the oil level. Oil tank 20 is located on a jacking platform 21, and hydraulic cylinder 22 is located on a system equipment platform 23. It is equipped with a sample securing strap 24 for securing various samples. Shutoff valves 2 and 3 control the upward and downward movement of hydraulic cylinder 22, thereby achieving the upward and downward movement of jacking platform 21, making it suitable for operating switches at various heights. If necessary, heavy-duty universal wheels can be installed under the system equipment platform to facilitate mobile operations. This simple structure will not be described in detail. The control unit's touchscreen can display oil temperature, oil pressure, test count, test frequency, test time, and an emergency stop button. The required test times, rate, and test cycles can also be input. Through the gateway, the master PLC system controls the hydraulic pump system and hydraulic transmission system, as well as various alarms outside of threshold values. During the thousand-unit test life cycle, the angle sensor on the composite drive shaft 14 can output and display the drive shaft's rotation angle. In the event of a switch refusal to close or open, it can be determined and quickly implemented to bring the system to an emergency stop, preventing damage to the test specimen and equipment caused by torque output. The drive shaft 14 drives the operating mechanisms of various types of test specimens, providing stable and reliable transmission output.

[0030] This utility model meets the mechanical life test requirements of national standards for medium- and high-voltage switches. Utilizing hydraulic transmission, it is not only fully adaptable to switches with operating mechanism torques ≤ 250 N·m, but also achieves transmission outputs with torques ≥ 250 N·m by setting the pressure threshold through PLC control of the electromagnetic relief valve. This overcomes the limitations of pneumatic and electric transmissions, which often result in short system lifespans due to cylinder pull. The torque is fully adjustable and controllable. This system offers stable load operation and a long lifespan, reduces labor repetitiveness, significantly reduces labor costs, and significantly improves test efficiency. Low-voltage control and hydraulic gear transmission enhance test safety and reliability.

[0031] It is worth mentioning that the technical features such as the high-voltage cabinet switch involved in this utility model patent application should be regarded as prior art. The specific structure, working principle and possible control method and spatial layout method of these technical features can be selected by conventional means in the field and should not be regarded as the inventive point of this utility model patent. This utility model patent will not be further elaborated.

[0032] For those skilled in the art, it is still possible to modify the technical solutions described in the aforementioned embodiments, or to replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model should be included in the scope of protection of the present utility model.

Claims

1. A high-voltage cabinet switch mechanical life test device based on hydraulic transmission, characterized in that: It includes a fuel tank, a transmission module and a drive detection module, wherein: The transmission module includes a hydraulic pump, a first filter, a temperature regulator, a flow valve, a first one-way valve, a two-position two-way solenoid valve and a two-position three-way solenoid reversing valve, wherein the hydraulic pump is placed in the oil tank and is connected to an input end of the two-position three-way solenoid reversing valve through the first filter, the temperature regulator, the flow valve, the first one-way valve and the two-position two-way solenoid valve in sequence; The drive detection module includes a first involute transmission gear, a second involute transmission gear and a compound transmission shaft. The first output end of the two-position three-way electromagnetic reversing valve is connected to the input end of the first involute transmission gear through an input oil pipe, and the second output end of the two-position three-way electromagnetic reversing valve is connected to the input end of the second involute transmission gear through an input oil pipe. The compound transmission shaft is installed between the first involute transmission gear and the second involute transmission gear and the compound transmission shaft is used to insert handle key connectors of various types of switches. The output end of the first involute transmission gear and the output end of the second involute transmission gear are connected to the oil tank through the same output oil pipe, and the output oil pipe is installed with a second filter.

2. A hydraulically driven high-voltage cabinet switch mechanical life test device according to claim 1, characterized in that: The output end of the first one-way valve is also connected to the oil tank through a pressure gauge and an electromagnetic overflow valve.

3. A hydraulically driven high-voltage cabinet switch mechanical life test device according to claim 2, characterized in that: The oil tank is equipped with an oil temperature sensor and an oil level sensor.

4. The hydraulic transmission-based high-voltage cabinet switch mechanical life test device according to claim 3 is characterized in that: The oil tank is installed on the jacking platform, and the jacking platform is installed on the equipment platform through a hydraulic cylinder. The equipment platform is installed with a sample fixing belt.

5. The hydraulic transmission-based high-voltage cabinet switch mechanical life test device according to claim 4 is characterized in that: The output end of the first filter is connected to the hydraulic cylinder via a first shut-off valve, and the oil tank is connected to the hydraulic cylinder via a second one-way valve and a second shut-off valve.

Images