Three-position disconnecting switch capable of intelligently adjusting grounding and closing synchronization and adjusting method

Abstract

The invention relates to a three-station isolating switch capable of intelligently adjusting grounding and closing synchronization and an adjusting method, the three-station isolating switch comprises a three-station isolating switch and a controller, the three-station isolating switch is provided with a grounding beam, and the grounding beam is provided with a group of lifting type grounding contact assemblies corresponding to isolating knife switches of three stations respectively. The lifting type grounding contact assembly comprises an insulating fixing support, lifting driving mechanisms are installed at the bottom of the insulating fixing support, the top output ends of the lifting driving mechanisms are connected with insulating parts, the tops of the insulating parts are connected with supporting shafts, grounding contacts are installed at the top ends of the supporting shafts, and all the lifting driving mechanisms are in signal connection with the controller. Displacement sensors are arranged on the rack of the three-position isolating switch corresponding to each group of lifting type grounding contact assemblies, the displacement sensors are used for detecting the height of the corresponding contacts, and all the displacement sensors are in signal connection with the controller; according to the invention, the adjustment efficiency and precision are significantly improved, rapid and accurate adjustment of grounding closing synchronization is realized, the adjustment time is shortened, and the working efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of three-position isolating switches, in particular to a three-position isolating switch capable of intelligently adjusting a grounding contact period and an adjustment method. Background Art

[0002] In the power system, the three-position disconnector is an indispensable device in the transmission and distribution line, which is used to realize the isolation, grounding and connection functions of the circuit. The grounding closing period refers to the synchronization of the three positions during the grounding operation. It is one of the important indicators to measure the performance of the disconnector and is directly related to the reliability and safety of the grounding operation. When adjusting the grounding closing period of the traditional three-position disconnector, it is usually necessary to manually adjust the height of the grounding contact. The process is cumbersome and the accuracy is difficult to guarantee. It is not only inefficient, but also has the risk of misoperation. Therefore, there is an urgent need for a three-position disconnector and adjustment method that can simplify the adjustment process and improve the adjustment accuracy. Summary of the invention

[0003] The main purpose of the present invention is to solve the problems existing in the above-mentioned prior art and to provide a three-position isolating switch and an adjustment method that can intelligently adjust the grounding closing period.

[0004] The specific scheme of the present invention is: a three-position isolating switch with intelligently adjustable grounding switch period, including a three-position isolating switch and a controller, the three-position isolating switch is provided with a grounding beam, and the grounding beam is provided with a group of lifting grounding contact assemblies corresponding to the isolating switches of the three positions, respectively, the lifting grounding contact assemblies include an insulating fixed bracket, a lifting drive mechanism is installed at the bottom of the insulating fixed bracket, the top output end of the lifting drive mechanism is connected with an insulating part, the top of the insulating part is connected with a support shaft, and the top of the support shaft is provided with a grounding contact, each group of lifting drive mechanisms is connected with the controller signal, and a displacement sensor is installed on the frame of the three-position isolating switch corresponding to each group of lifting grounding contact assemblies, the displacement sensor is used to detect the height of the corresponding contact, and all displacement sensors are connected with the controller signal.

[0005] Furthermore, the insulating fixed bracket includes a top plate and a bottom plate, and a plurality of insulating pillars are fixedly connected between the top plate and the bottom plate.

[0006] Furthermore, the lifting drive mechanism of the present invention provides the following two specific solutions, and the first solution is to use a servo electric cylinder.

[0007] Option 2, the lifting drive mechanism includes a servo motor, the output shaft of the servo motor is equipped with a spline sleeve, the spline sleeve is rotatably connected to the insulating fixed bracket, a rotating shaft is slidably connected inside the spline sleeve, the rotating shaft slides along the axial direction, and an insulating part is installed on the top of the rotating shaft; the support shaft adopts a screw, the screw is threadedly connected to the insulating fixed bracket, and the grounding contact is fixedly connected to the top of the screw; the screw is connected to an angle sensor, and the angle sensor is used to detect the rotation angle of the screw.

[0008] Furthermore, the pitch of the screw is 0.2-1 mm.

[0009] Furthermore, the insulating member is an epoxy resin insulating pillar, and the bottom end of the support shaft is inserted into the epoxy resin insulating pillar.

[0010] The present invention also provides a method for adjusting the grounding closing period of a three-position isolating switch. The three-position isolating switch is used, and the adjustment method comprises the following steps: S1. Connect the grounding contact system, controller and mechanical property tester of the disconnector, start the controller and mechanical property tester, and set the grounding contact period preset value; S2, close the grounding switch, and the mechanical characteristics tester tests the grounding switch contract parameters and feeds back to the controller; S3, the controller issues an adjustment command to the lifting drive mechanism according to the tested synchronous data to raise or lower the height of the grounding contact, and the displacement sensor detects the height position of the grounding contact in real time. When the adjustment height is reached, the controller stops the lifting drive mechanism; S4, the controller sends out a command, and the mechanical property tester tests again whether the grounding contract period reaches the preset value of the grounding contract period. If not, repeat step S3 until it reaches the preset value.

[0011] Compared with the prior art, the present invention has the following advantages: 1. Significantly improves the adjustment efficiency and accuracy: through the joint use of the lifting drive mechanism, the sensor and the controller, the fast and accurate adjustment of the grounding contact period is achieved, which greatly shortens the adjustment time and improves the work efficiency.

[0012] 2. Enhance operational safety and reliability: Intelligent management and fault diagnosis functions can monitor in real time whether the equipment is in the grounded state for safe maintenance.

[0013] 3. Reduce maintenance costs: The compact and easy-to-maintain design makes daily maintenance and troubleshooting easier and more convenient, reducing maintenance costs.

[0014] 4. Adapting to the development trend of smart grid: The present invention integrates intelligent monitoring and automatic control systems, meets the requirements of smart grid for intelligent and automated management of equipment, and provides strong support for the intelligent upgrade of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional view of the structure of the present invention; Figure 2 yes Figure 1 A three-dimensional schematic diagram of the grounding closed state; Figure 3 It is a three-dimensional view of the second solution of the lifting drive mechanism of the present invention; Figure 4 yes Figure 3 A partial cross-sectional view of Figure 5 It is a three-dimensional view of the first embodiment of the lifting drive mechanism of the present invention; In the figure: 1. grounding beam; 2. lifting drive mechanism; 3. insulating fixing bracket; 21. servo motor; 22. spline sleeve; 23. rotating shaft; 24. insulating member; 25. screw; 26. grounding contact; 27. servo electric cylinder; 28. connecting rod; 31. top plate; 32. insulating support; 33. bottom plate. DETAILED DESCRIPTION

[0016] Example 1 See Figure 1 , Figure 2 , Figure 5 The present embodiment is a three-station isolating switch capable of intelligently adjusting the grounding switch contract period, comprising a three-station isolating switch and a controller. The three-station isolating switch is provided with a grounding beam 1, and a group of lifting grounding contact 26 components are respectively provided on the grounding beam 1 corresponding to the isolation switches of the three stations. The lifting grounding contact 26 components include an insulating fixed bracket 3, and a lifting drive mechanism 2 is installed at the bottom of the insulating fixed bracket 3. The top output end of the lifting drive mechanism 2 is connected with an insulating member 24, and the top of the insulating member 24 is connected with a support shaft, and the top of the support shaft is equipped with a grounding contact 26. Each group of lifting drive mechanisms 2 is connected to the controller signal. A displacement sensor is installed on the frame of the three-station isolating switch corresponding to each group of lifting grounding contact 26 components. The displacement sensor is used to detect the height of the corresponding contact, and all displacement sensors are connected to the controller signal.

[0017] Furthermore, the insulating fixing bracket 3 includes a top plate 31 and a bottom plate 33 , a plurality of insulating pillars 32 are fixedly connected between the top plate 31 and the bottom plate 33 , and the top plate 31 is fixedly connected to the bottom surface of the grounding beam 1 .

[0018] Furthermore, the lifting drive mechanism 2 described in the present invention adopts a servo electric cylinder 27, the output end push rod of the servo electric cylinder 27 faces upward, the push rod passes through the bottom plate 33 and is slidably connected to the bottom plate 33, the top of the push rod is equipped with an insulating member 24, the top of the insulating member 24 is inserted with a connecting rod 28, the top of the connecting rod 28 passes through the top plate 31 upward and is equipped with a grounding contact 26, and the connecting rod 28 is slidably connected to the top plate 31.

[0019] Furthermore, the insulating member 24 is an epoxy resin insulating pillar 32 , and the bottom end of the support shaft is inserted into the epoxy resin insulating pillar 32 .

[0020] The present embodiment also provides a method for adjusting the grounding contact period of a three-position isolating switch. The three-position isolating switch mentioned above is used, and the adjustment method includes the following steps: S1. Connect the grounding contact 26 system, controller and mechanical property tester of the isolating switch, start the controller and the mechanical property tester, and set the preset value of the grounding contact period; S2. Close the grounding switch, and the mechanical property tester tests the grounding contact period parameters and feeds back to the controller; S3. The controller issues an adjustment instruction to the lifting drive mechanism 2 according to the tested synchronous data to raise or lower the height of the grounding contact 26. The displacement sensor detects the height position of the grounding contact 26 in real time. When the adjustment height is reached, the controller stops the lifting drive mechanism 2; S4. The controller issues an instruction, and the mechanical property tester tests again whether the grounding contact period reaches the preset value of the grounding contact period. If not, repeat step S3 until the preset value is reached.

[0021] The present invention adjusts the height of the grounding contact 26 of the corresponding station according to the actual measurement situation, so that the grounding closing of the three stations is synchronized, that is, the grounding closing period parameters are within the set value range.

[0022] Example 2 See Figure 3 , Figure 4 The structure of this embodiment is basically the same as that of the first embodiment, except that the lifting drive mechanism 2 includes a servo motor 21, the output shaft of the servo motor 21 is provided with a spline sleeve 22, the spline sleeve 22 is rotatably connected to the insulating fixed bracket 3, a rotating shaft 23 is slidably connected in the spline sleeve 22, the rotating shaft 23 slides along the axial direction, and an insulating member 24 is provided at the top of the rotating shaft 23; the support shaft adopts a screw 25, the screw 25 is threadedly connected to the top plate 31, and the top of the screw 25 is fixedly connected with the grounding contact 26; the screw 25 is connected with an angle sensor, and the angle sensor is used to detect the rotation angle of the screw 25. The inner wall surface of the spline sleeve 22 is provided with a key arranged along the axial direction, and the outer wall surface of the rotating shaft 23 is provided with a keyway matching the key, and the length of the keyway and the key exceeds the maximum adjustment stroke.

[0023] Furthermore, the pitch of the screw 25 is 0.2-1 mm. The working principle of the lifting drive mechanism 2 of this embodiment is as follows: when the controller sends a signal to the servo motor 21, the angle sensor performs real-time detection and feeds back to the controller, and the controller controls the servo motor 21 to rotate an angle of an integer multiple of 180°, thereby ensuring that the direction of the grounding contact 26 does not change.

[0024] During the adjustment process, the servo motor 21 drives the spline sleeve 22 to rotate, and the spline sleeve 22 transmits the torque to the rotating shaft 23 through the key, and the rotating shaft 23 then transmits the torque to the screw 25. Since the screw 25 is threadedly connected to the top plate 31, and the top plate 31 is fixed, the screw 25 will move up and down in the axial direction, and at the same time drive the rotating shaft 23 to move up and down in the axial direction, and the grounding contact 26 at the top of the screw 25 can achieve height adjustment together with the screw 25.

Claims

1. The three-position isolating switch with intelligently adjustable grounding and closing period is characterized by: It includes a three-station isolating switch and a controller. The three-station isolating switch is provided with a grounding beam. The grounding beam is provided with a group of lifting grounding contact assemblies corresponding to the isolating switches of the three stations. The lifting grounding contact assemblies include an insulating fixed bracket. A lifting drive mechanism is installed at the bottom of the insulating fixed bracket. The top output end of the lifting drive mechanism is connected with an insulating member. The top of the insulating member is connected with a supporting shaft. The top of the supporting shaft is provided with a grounding contact. Each group of lifting drive mechanisms is connected with the controller signal. A displacement sensor is installed on the frame of the three-station isolating switch corresponding to each group of lifting grounding contact assemblies. The displacement sensor is used to detect the height of the corresponding contact. All displacement sensors are connected with the controller signal.

2. The three-position isolating switch with intelligently adjustable grounding closing period according to claim 1 is characterized in that: The insulating fixing bracket comprises a top plate and a bottom plate, and a plurality of insulating pillars are fixedly connected between the top plate and the bottom plate.

3. The three-position isolating switch with intelligently adjustable grounding closing period according to claim 1 is characterized in that: The lifting drive mechanism adopts a servo electric cylinder.

4. The three-position isolating switch with intelligently adjustable grounding closing period according to claim 1 is characterized in that: The lifting drive mechanism includes a servo motor, the output shaft of the servo motor is equipped with a spline sleeve, the spline sleeve is rotatably connected to the insulating fixed bracket, a rotating shaft is slidably connected in the spline sleeve, the rotating shaft slides along the axial direction, and an insulating part is installed on the top of the rotating shaft; the support shaft adopts a screw, the screw is threadedly connected to the insulating fixed bracket, and the grounding contact is fixedly connected to the top of the screw; the screw is connected to an angle sensor, and the angle sensor is used to detect the rotation angle of the screw.

5. The three-position isolating switch with intelligently adjustable grounding closing period according to claim 4 is characterized in that: The pitch of the screw is 0.2-1 mm.

6. The three-position isolating switch with intelligently adjustable grounding closing period according to claim 1 is characterized in that: The insulating member is an epoxy resin insulating pillar, and the bottom end of the support shaft is inserted into the epoxy resin insulating pillar.

7. The grounding closing period adjustment method of the three-position isolating switch is characterized by: Using the three-position disconnector according to any one of claims 1 to 6, the adjustment method comprises the following steps: S1. Connect the grounding contact system, controller and mechanical property tester of the disconnector, start the controller and mechanical property tester, and set the grounding contact period preset value; S2, close the grounding switch, and the mechanical characteristics tester tests the grounding switch contract parameters and feeds back to the controller; S3, the controller issues an adjustment command to the lifting drive mechanism according to the tested synchronous data to raise or lower the height of the grounding contact, and the displacement sensor detects the height position of the grounding contact in real time. When the adjustment height is reached, the controller stops the lifting drive mechanism; S4, the controller sends out a command, and the mechanical property tester tests again whether the grounding contract period reaches the preset value of the grounding contract period. If not, repeat step S3 until it reaches the preset value.

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