20KV power grid simulation short circuit grounding test equipment and method

Abstract

The invention discloses a 20KV power grid simulation short circuit grounding test device and method, and belongs to the technical field of circuit testing. The 20KV power grid simulation short-circuit grounding test equipment comprises a supporting table, and further comprises a rotating disc mechanism which comprises a rotating disc, a power device and a plurality of conducting strips, the conducting strips are arranged on the rotating disc in the circumferential direction of the rotating disc, and the power device is connected with the rotating disc; the discharging part comprises a static discharging column and a movable discharging column, the high-voltage discharging device is used for generating and releasing sine alternating current, the movable discharging column is electrically connected with a ground wire, and in the process that the power device drives the rotary disc to rotate, the multiple conducting strips on the rotary disc sweep between the static discharging column and the movable discharging column in sequence. When each conducting strip is located between the static discharge column and the movable discharge column, sine alternating current released by the high-voltage discharge device is located at a wave crest or a wave trough. According to the 20KV power grid simulation short-circuit grounding test equipment, the discharge frequency and the time control precision can be remarkably improved, and then a high-voltage short-circuit grounding fault phenomenon can be repeatedly and accurately simulated.

Description

Technical Field

[0001] This invention relates to the field of circuit testing technology, specifically to a 20kV power grid simulated short-circuit grounding test equipment and method. Background Technology

[0002] With rapid social development, my country's economic level and the quality of life of its people have significantly improved, and various household appliances have become widely available in homes. Especially in industrial areas and economically developed regions, residential electricity consumption has increased dramatically, and the existing 10KV power grid can no longer meet the construction needs. Therefore, power bureaus have begun to gradually focus on the maintenance and construction of the 20KV power grid.

[0003] However, during transmission, high-voltage electricity is prone to short-circuit faults and other circuit problems due to factors such as line aging and external interference. Once a short-circuit fault occurs, it not only directly causes the transmission line to burn down, but may also trigger a chain reaction of hazards—such as burning down surrounding trees and causing large-scale power outages in nearby communities. These situations can seriously disrupt residents' daily lives and affect the normal operation of production activities. By conducting simulated short-circuit grounding tests on high-voltage power grids to study the phenomenon of short-circuit grounding caused by arc discharge in high-voltage power grids, and then studying corresponding preventive measures, the probability of short-circuit faults in high-voltage power grids can be reduced.

[0004] Existing high-voltage power grid simulated short-circuit grounding test devices mostly employ fixed discharge structures or simple mechanical triggering discharge designs. Arc discharge is typically achieved through manual control of the discharge switch or a fixed-frequency mechanical triggering device. These devices lack an active phase matching mechanism between the discharge and the AC current, resulting in limitations in precisely controlling the discharge on / off state. They struggle to achieve high-frequency on / off operations within extremely short timeframes (e.g., 0.02 seconds), making it impossible to precisely synchronize the discharge timing with specific phases such as AC current peaks and troughs. Ultimately, this leads to discrepancies between the simulated short-circuit grounding fault and the actual power grid fault's electrical characteristics, affecting test accuracy. Summary of the Invention

[0005] The purpose of this invention is to overcome the problems in the prior art and provide a 20KV power grid simulation short-circuit grounding test equipment, which can achieve precise matching of discharge and AC phase, thereby significantly improving the discharge frequency and time control accuracy, and thus repeatably and accurately simulating the phenomenon of high-voltage short-circuit grounding faults.

[0006] This invention provides a 20kV power grid simulated short-circuit grounding test equipment, including a support platform, and further comprising: A turntable mechanism includes a turntable, a power unit, and multiple conductive plates. The turntable is rotatably connected to the support platform. The turntable is made of insulating material. Multiple conductive plates are arranged on the turntable along its circumference. The power unit is connected to the turntable. The discharge section includes a static discharge column and a dynamic discharge column. The static discharge column is located on one side of the turntable and is electrically connected to a high-voltage discharge device, which generates and releases sinusoidal alternating current. The dynamic discharge column is located on the other side of the turntable and is positioned opposite to the static discharge column. The dynamic discharge column is electrically connected to the ground wire. During the rotation of the turntable driven by the power device, multiple conductive plates on the turntable sweep sequentially between the static discharge column and the dynamic discharge column. When each conductive plate is between the static discharge column and the dynamic discharge column, the sinusoidal alternating current released by the high-voltage discharge device is at a peak or trough.

[0007] Preferably, the plurality of conductive sheets are evenly distributed on the outer edge of the turntable, the angle between the line connecting two adjacent conductive sheets and the center of the turntable is 36 degrees, and the rotational angular velocity of the turntable is 600 rad / s.

[0008] Preferably, the support platform is provided with a linear slide, the length direction of which is parallel to the axis of the turntable. The linear slide is connected to the moving discharge column and is used to adjust the distance between the moving discharge column and the turntable.

[0009] Preferably, the support platform is provided with a bracket, and the bracket is provided with a swing cylinder. The swing cylinder is connected to one end of the static discharge column. The swing cylinder is used to drive the static discharge column to rotate in the vertical plane so that the other end of the static discharge column is close to or away from the turntable.

[0010] Preferably, the bracket is also provided with a limiting post, which is located above the turntable. When the swing cylinder drives the limiting post to rotate downward, the side wall of the static discharge column can abut against the limiting post. Under the limiting action of the limiting post, the end of the static discharge column away from the swing cylinder is directly opposite the dynamic discharge column.

[0011] Preferably, the linear slide is an electric ball screw slide.

[0012] Preferably, the linear slide is electrically connected to a controller, and the controller is electrically connected to a power unit.

[0013] Preferably, the turntable is made of plexiglass.

[0014] Preferably, there is a cutout between two adjacent conductive sheets on the turntable.

[0015] This invention also provides a method for testing using 20kV power grid simulated short-circuit grounding test equipment, comprising the following steps: Driven by a power device, an insulated turntable rotates. Multiple conductive plates on the turntable sweep sequentially between the static discharge column and the dynamic discharge column. By controlling the rotation speed of the turntable, the sinusoidal alternating current released by the high-voltage discharge device is at a peak or trough when each conductive plate is between the static discharge column and the dynamic discharge column. The distance between the dynamic discharge column and the static discharge column is adjusted so that the air between the dynamic discharge column and the static discharge column is ionized only when the conductive plate is between them, thereby realizing the intermittent arc discharge phenomenon and repeatably simulating the phenomenon of high voltage short circuit grounding fault.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: The 20kV power grid short-circuit grounding test equipment of the present invention achieves its function in the following way: First, the turntable is driven to rotate, so that multiple conductive plates on the turntable sweep sequentially between the static discharge column and the dynamic discharge column; at the same time, the rotation speed of the turntable is controlled to ensure that when each conductive plate is between the static discharge column and the dynamic discharge column, the sinusoidal alternating current released by the high-voltage discharge device is exactly at the peak or trough. Second, the distance between the dynamic discharge column and the static discharge column is adjusted so that the air between the dynamic discharge column and the static discharge column is ionized only when the conductive plate is between them, thereby realizing the intermittent arc discharge phenomenon. This repeatably simulates the phenomenon of high-voltage power short-circuit grounding faults, guiding users to detect and effectively prevent various types of circuit short-circuit accidents.

[0017] Furthermore, this equipment precisely divides the turntable into multiple equal sections, each corresponding to a specific discharge point, achieving accurate alignment of discharge positions through this division design. Simultaneously, the power unit precisely controls the turntable's rotation speed, ensuring that each section of the turntable sequentially passes through a preset discharge position. Each time a discharge position is passed, a discharge operation is completed within the corresponding division cycle. Ultimately, this allows the equipment to perform multiple precise discharges per turn of the turntable, significantly improving the discharge frequency and time control accuracy. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the main structure of the first working state of the present invention; Figure 2 This is a schematic diagram of the left-side structure in the first working state of the present invention; Figure 3 This is a schematic diagram of the left-side structure in the second working state of the present invention; Figure 4 This is a schematic diagram of the linear slide of the present invention; Figure 5 This is a schematic diagram of the structure of the turntable in this invention; Figure 6 This is a schematic diagram of the linear slide of the present invention.

[0019] Explanation of the reference numerals in the attached figures.

[0020] 1. Support platform; 101. Turntable; 102. Power unit; 103. Conductive sheet; 104. Static discharge column; 105. Dynamic discharge column; 106. Positive terminal; 107. Grounding terminal; 2. Linear slide; 301. Bracket; 302. Swing cylinder; 4. Limiting post. Detailed Implementation

[0021] The following is combined with Figures 1-6 The specific embodiments of the present invention will be described in detail below, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0022] like Figures 1-6 As shown, the present invention provides a 20kV power grid simulated short-circuit grounding test equipment, including a support platform 1, and further including: a turntable mechanism, a discharge section, and a drive section. The turntable mechanism includes a turntable 101, a power unit 102, and multiple conductive plates 103. The turntable 101 is rotatably connected to the support platform 1. The turntable 101 is made of insulating material. The multiple conductive plates 103 are arranged on the turntable 101 along the circumference of the turntable 101. The power unit 102 is connected to the turntable 101. The discharge section includes a static discharge column 104 and a dynamic discharge column 105. The static discharge column 104... 04 is located on one side of the turntable 101. The static discharge column 104 is electrically connected to the high-voltage discharge device. The dynamic discharge column 105 is located on the other side of the turntable 101. The dynamic discharge column 105 is arranged opposite to the static discharge column 104 and is electrically connected to the ground wire. When the turntable 101 rotates, multiple conductive plates 103 sweep sequentially between the static discharge column 104 and the dynamic discharge column 105. The driving unit is connected to the dynamic discharge column 105 and is used for adjustment. The driving unit is used to adjust the distance between the dynamic discharge column 105 and the turntable 101.

[0023] The working principle of the above embodiments is briefly described below: The power unit 102 is an AC servo motor, which is connected to the turntable 101 via a connecting shaft. The servo motor (model 123BLD100-10) drives the turntable 101 to rotate 360° (accuracy ±0.5°) via a worm gear transmission. The connecting shaft of the servo motor has a diameter of 22mm and is designed as a hollow shaft with an inner diameter d of 22mm. After the position of the static discharge column 104 is determined, the static discharge column 104 is provided with a positive terminal 106 as its high-voltage inlet for electrical connection with the high-voltage discharge device. The moving discharge column 105 is provided with a grounding terminal 107 for electrical connection with the grounding wire. The power unit 102 (i.e., the servo AC motor) directly drives the insulated turntable 101 to rotate via a three-pin positioning connecting shaft. Multiple conductive plates 103 on the turntable 101 sweep sequentially between the static discharge column 104 and the moving discharge column 105, controlling the rotation speed of the turntable 101 so that each conductive plate 103... When the conductive plate 103 is positioned between the static discharge column 104 and the dynamic discharge column 105, the sinusoidal alternating current released by the high-voltage discharge device is at its peak or trough. At this time, the potential difference between the dynamic discharge column 105 and the static discharge column 104 is the largest, and the air between the dynamic discharge column 105 and the static discharge column 104 is most easily ionized. When the conductive plate 103 is positioned between the dynamic discharge column 105 and the static discharge column 104, the equivalent distance between the dynamic discharge column 105 and the static discharge column 104 can be reduced, making the air between the dynamic discharge column 105 and the static discharge column 104 even easier to ionize. By adjusting the distance between the dynamic discharge column 105 and the static discharge column 104, ionization of the air between the dynamic discharge column 105 and the static discharge column 104 only occurs when the conductive plate 103 is positioned between them, thus achieving an intermittent arc discharge phenomenon for repeatable simulation of high-voltage short-circuit grounding fault phenomena. Furthermore, the rotation of the turntable 101 causes gas flow between the dynamic discharge column 105 and the static discharge column 104. The gas blowing arc is widely used in circuit breakers. This process not only increases convection and cools the arc, but also blows away the original charged particles in the arc gap, thereby improving the recovery speed of the dielectric insulation strength.

[0024] The 20kV power grid simulation short-circuit grounding test equipment of this invention can realize intermittent arc discharge phenomena to repeatedly simulate high-voltage short-circuit grounding faults, thereby guiding users to detect and effectively prevent various circuit short-circuit accidents. Furthermore, this equipment precisely divides the turntable 101 into multiple equal parts, with each part corresponding to a specific discharge point, achieving precise correspondence of discharge positions through this division design. The power unit 102 precisely controls the rotation speed of the turntable 101, ensuring that each division of the turntable 101 sequentially passes through a preset discharge position. Each time a discharge position is passed, a discharge operation is completed within the corresponding division cycle, allowing the equipment to achieve multiple precise discharges per rotation of the turntable 101, significantly improving the discharge frequency and time control accuracy.

[0025] Based on the above embodiments, in order to ensure that when the conductive sheet 103 is between the dynamic discharge column 105 and the static discharge column 104, the sinusoidal alternating current released by the high-voltage discharge device is at the peak or trough.

[0026] like Figure 2 and Figure 3 As shown, the plurality of conductive sheets 103 are evenly distributed on the outer edge of the turntable 101, the angle between the line connecting two adjacent conductive sheets 103 and the center of the turntable 101 is 36 degrees, and the rotational angular velocity of the turntable 101 is 600 rad / s.

[0027] When the angle between the line connecting two adjacent conductive plates 103 and the center of the turntable 101 is 36 degrees, dividing the insulated turntable 101 into ten equal parts, and fixing one conductive plate 103 at each part, and the rotational angular velocity of the turntable 101 is 600 rad / s, the period between two adjacent conductive plates 103 passing through the moving discharge column 105 and the static discharge column 104 is 0.02s. Since the frequency of the sinusoidal alternating current is 50Hz, it can be ensured that the two are perfectly matched. This ensures that when the conductive plate 103 is exactly between the static discharge column 104 and the moving discharge column 105, the sinusoidal alternating current released by the high-voltage discharge device is at a peak or trough.

[0028] As a preferred option, such as Figure 1 , Figure 4 and Figure 6As shown, the support platform 1 is equipped with a linear slide 2, the length direction of which is parallel to the axis of the turntable 101. The linear slide 2 is connected to the moving discharge column 105 and is used to adjust the distance between the moving discharge column 105 and the turntable 101. By adjusting the distance between the moving discharge column 105 and the turntable 101 using the linear slide 2, the distance between the moving discharge column 105 and the static discharge column 104 is adjusted, ensuring that the working distance between the moving discharge column 105 and the static discharge column 104 meets the requirements. This ensures that the air between the moving discharge column 105 and the static discharge column 104 is ionized only when the conductive sheet 103 is between the moving discharge column 105 and the static discharge column 104, thus ensuring the accuracy of the test results.

[0029] As a preferred option, such as Figures 1-3 and Figure 6 As shown, the support platform 1 is equipped with a bracket 301, and the bracket 301 is equipped with a swing cylinder 302. The swing cylinder 302 is connected to one end of the static discharge column 104. The swing cylinder 302 is used to drive the static discharge column 104 to rotate in the vertical plane, so that the other end of the static discharge column 104 moves closer to or away from the turntable 101. The swing cylinder 302 is a CRB2BW30-90S type swing cylinder 302 with a contact resistance ≤0.1Ω. Before the test, under the action of the swing cylinder 302, the static discharge column 104 is positioned above the turntable 101, so that the static discharge column 104 and the moving discharge column 105 are far apart to ensure safety. At the start of the test, the swing cylinder 302 drives the static discharge column 104 to fall, so that the static discharge column 104 and the moving discharge column 105 are directly opposite each other, thereby conducting the test experiment.

[0030] As a preferred option, such as Figures 1-4 and Figure 6 As shown, the bracket 301 is also equipped with a limiting post 4, which is located above the turntable 101. When the swing cylinder 302 drives the limiting post 4 to rotate downward, the side wall of the static discharge column 104 can abut against the limiting post 4. Under the limiting action of the limiting post 4, the end of the static discharge column 104 away from the swing cylinder 302 is directly opposite the moving discharge column 105. The limiting post 4 is made of an insulating material with a certain elasticity. During the process of the swing cylinder 302 driving the static discharge column 104 to fall, when the side wall of the static discharge column 104 can abut against the limiting post 4, the limiting post 4 absorbs the falling potential energy of the static discharge column 104 and restricts the position of the static discharge column 104. Under the limiting action of the limiting post 4, the accuracy of the position of the static discharge column 104 can be guaranteed, thereby ensuring that the end of the static discharge column 104 away from the swing cylinder 302 is directly opposite the moving discharge column 105, thus ensuring the accuracy of the test results.

[0031] As a preferred option, such as Figure 1 and Figure 6As shown, the linear slide 2 is an electric ball screw slide. A stepper motor drives the electric ball screw slide to move, thereby driving the moving discharge column 105 to operate, ensuring the required working distance between the moving discharge column 105 and the static discharge column 104.

[0032] As a preferred option, such as Figure 1 As shown, the linear slide 2 is electrically connected to a controller, which is electrically connected to the power unit 102. The controller is a combined controller with an industrial computer as the main component and a microcontroller as an auxiliary component, which can ensure the motion accuracy of the linear slide 2 and the power unit 102.

[0033] As a preferred option, such as Figures 1-3 and Figure 5 As shown, the turntable 101 is made of plexiglass. Using plexiglass to make the turntable 101 ensures its insulation and reduces its weight, preventing the inertia of the turntable 101 from affecting the accuracy of the test results.

[0034] As a preferred option, such as Figure 2 and Figure 3 As shown, there is a cutout between two adjacent conductive sheets 103 on the turntable 101. Cutting out the space between two adjacent conductive sheets 103 on the turntable 101 can further reduce the mass of the turntable 101 itself.

[0035] This invention also provides a method for testing using 20kV power grid simulated short-circuit grounding test equipment, comprising the following steps: The insulated turntable 101 is driven to rotate by the power device 102. Multiple conductive plates 103 on the turntable 101 sweep between the static discharge column 104 and the dynamic discharge column 105 in sequence. The rotation speed of the turntable 101 is controlled so that when each conductive plate 103 is between the static discharge column 104 and the dynamic discharge column 105, the sinusoidal alternating current released by the high-voltage discharge device is at the peak or trough. The distance between the dynamic discharge column 105 and the static discharge column 104 is adjusted so that the air between the dynamic discharge column 105 and the static discharge column 104 is ionized only when the conductive sheet 103 is between the dynamic discharge column 105 and the static discharge column 104, thereby realizing the intermittent arc discharge phenomenon to repeatably simulate the phenomenon of high voltage short circuit grounding fault.

[0036] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention.

Claims

1. A 20kV power grid simulated short-circuit grounding test equipment, comprising a support platform (1), characterized in that, Also includes: The turntable mechanism includes a turntable (101), a power unit (102), and multiple conductive plates (103). The turntable (101) is rotatably connected to the support platform (1). The turntable (101) is made of insulating material. Multiple conductive plates (103) are arranged on the turntable (101) along the circumference of the turntable (101). The power unit (102) is connected to the turntable (101). The discharge section includes a static discharge column (104) and a dynamic discharge column (105). The static discharge column (104) is located on one side of the turntable (101) and is electrically connected to a high-voltage discharge device. The high-voltage discharge device is used to generate and release sinusoidal alternating current. The dynamic discharge column (105) is located on the other side of the turntable (101) and is positioned opposite to the static discharge column (104). The dynamic discharge column (105) is electrically connected to the ground wire. During the rotation of the turntable (101) driven by the power device (102), multiple conductive plates (103) on the turntable (101) sweep sequentially between the static discharge column (104) and the dynamic discharge column (105). When each conductive plate (103) is between the static discharge column (104) and the dynamic discharge column (105), the sinusoidal alternating current released by the high-voltage discharge device is at a peak or trough.

2. The 20kV power grid simulated short-circuit grounding test equipment as described in claim 1, characterized in that, The plurality of conductive sheets (103) are evenly distributed on the outer edge of the turntable (101), the angle between the line connecting two adjacent conductive sheets (103) and the center of the turntable (101) is 36 degrees, and the rotational angular velocity of the turntable (101) is 600 rad / s.

3. The 20kV power grid simulated short-circuit grounding test equipment as described in claim 1, characterized in that, The support platform (1) is provided with a linear slide (2). The length direction of the linear slide (2) is parallel to the axis of the turntable (101). The linear slide (2) is connected to the moving discharge column (105). The linear slide (2) is used to adjust the distance between the moving discharge column (105) and the turntable (101).

4. The 20kV power grid simulated short-circuit grounding test equipment as described in claim 1, characterized in that, The support platform (1) is provided with a bracket (301), and the bracket (301) is provided with a swing cylinder (302). The swing cylinder (302) is connected to one end of the static discharge column (104). The swing cylinder (302) is used to drive the static discharge column (104) to rotate in the vertical plane so that the other end of the static discharge column (104) is close to or away from the turntable (101).

5. The 20kV power grid simulated short-circuit grounding test equipment as described in claim 4, characterized in that, The bracket (301) is also provided with a limiting post (4), which is located above the turntable (101). When the swing cylinder (302) drives the limiting post (4) to rotate downward, the side wall of the static discharge column (104) can abut against the limiting post (4). Under the limiting action of the limiting post (4), the end of the static discharge column (104) away from the swing cylinder (302) is directly opposite the dynamic discharge column (105).

6. The 20kV power grid simulated short-circuit grounding test equipment as described in claim 3, characterized in that, The linear slide (2) is an electric ball screw slide.

7. The 20kV power grid simulated short-circuit grounding test equipment as described in claim 3, characterized in that, The linear slide (2) is electrically connected to a controller, which is electrically connected to a power unit (102).

8. The 20kV power grid simulated short-circuit grounding test equipment as described in claim 1, characterized in that, The turntable (101) is made of plexiglass.

9. The 20kV power grid simulated short-circuit grounding test equipment as described in claim 1, characterized in that, The turntable (101) has a cutout between two adjacent conductive sheets (103).

10. A method for testing using the 20kV power grid simulated short-circuit grounding test equipment as described in claim 1, characterized in that, Includes the following steps: Driven by a power device (102), the insulated turntable (101) rotates. Multiple conductive plates (103) on the turntable (101) sweep sequentially between the static discharge column (104) and the dynamic discharge column (105). The rotation speed of the turntable (101) is controlled so that when each conductive plate (103) is between the static discharge column (104) and the dynamic discharge column (105), the sinusoidal alternating current released by the high-voltage discharge device is at the peak or trough. The distance between the dynamic discharge column (105) and the static discharge column (104) is adjusted so that the air between the dynamic discharge column (105) and the static discharge column (104) is ionized only when the conductive sheet (103) is between the dynamic discharge column (105) and the static discharge column (104), thereby realizing the intermittent arc discharge phenomenon to repeatably simulate the phenomenon of high voltage short circuit grounding fault.

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