A device and method for detecting the preload state of main contacts of an on-load tap changer.

Abstract

This application discloses a device and method for detecting the preload state of the main contacts of an on-load tap changer, including a lifting mechanism, a force measuring mechanism, and a rotating mechanism. The lifting mechanism includes a lifting outer frame, with a rotating lifting platform disposed inside the lifting outer frame. The rotating lifting platform can move longitudinally within the lifting outer frame under the drive of a lifting motor. The force measuring mechanism is mounted on the rotating lifting platform, and the lifting outer frame can extend into the middle of the main contacts of the on-load tap changer, allowing the force measuring mechanism to apply force to the springs of the multi-layer, multi-phase main contact mechanism of the on-load tap changer and collect compression force data and compression distance data. The rotating mechanism is installed below the lifting mechanism to drive the rotating lifting platform to rotate, enabling the force measuring mechanism to rotate within the lifting outer frame. The detection process of this application can measure the compression force and compression distance data of the springs located at the ends of the multi-layer, multi-phase main contacts in the main contact mechanism, thereby providing data support for determining the preload state of the main contacts.

Description

Technical Field

[0001] This application belongs to the field of contact preload state detection technology, and relates to a technology for detecting the preload state of the main contacts of an on-load tap changer, specifically a device and method for detecting the preload state of the main contacts of an on-load tap changer. Background Technology

[0002] The on-load tap changer is the only core component in an ultra-high voltage converter transformer that operates frequently. The main contact mechanism is the actuating mechanism of the tap changer, used to carry current or connect and disconnect circuits. The main contact mechanism controls the circuit's on / off state to coordinate with other mechanisms to complete rapid switching actions from N to N+1 or from N+1 to N, thereby controlling the overall circuit on / off sequence of the switching core. Therefore, ensuring that all multi-layer, multi-phase main contacts in the main contact mechanism are in a normally pre-tightened working state is crucial for the on-load tap changer to complete normal switching.

[0003] The principle of main contact switching is that a rapid mechanism releases energy, driving the main shaft to rotate continuously, which in turn drives the moving contact to rotate, thus achieving the timing requirement of the moving and stationary contacts contacting from one side, disconnecting in the middle, and then contacting from the other side. The compression spring located at the rear end of the stationary contact serves to store and release energy, ensuring that the contact position can be properly compressed and restored during the contact process, thereby completing the switching action. Therefore, a complete inspection of the main contact preload state before actual switching, and timely detection of faulty springs, is of great significance to the reliability of on-load tap changer switching. However, existing technologies for on-load tap changers mostly focus on the structural design of on-load tap changers, with few technologies addressing the detection of the main contact preload state. Most rely on empirical methods for judgment, lacking a scientific method for collecting complete and reliable data for assessment. Summary of the Invention

[0004] The purpose of this application is to solve the problems in the prior art and provide a device and method for detecting the preload state of the main contact of an on-load tap changer. This application can effectively collect data and calculate the preload force and preload distance of the main contact to determine the current preload state of the main contact.

[0005] To achieve the above objectives, this application adopts the following technical solution:

[0006] In a first aspect, this application provides a device for detecting the preload state of the main contacts of an on-load tap changer, comprising:

[0007] A lifting mechanism, comprising a lifting outer frame, wherein a rotating lifting platform is provided inside the lifting outer frame, and the rotating lifting platform is capable of longitudinal movement within the lifting outer frame under the drive of a lifting motor;

[0008] The force measuring mechanism is installed on the rotary lifting platform. The lifting outer frame can extend into the middle of the main contact of the on-load tap changer, so that the force measuring mechanism can apply force to the spring of the multi-layer multi-phase main contact mechanism of the main contact of the on-load tap changer and collect compression force data and compression distance data.

[0009] A rotating mechanism is installed below the lifting mechanism to drive the rotating lifting platform to rotate, so that the force measuring mechanism can rotate within the lifting outer frame.

[0010] Furthermore, this application has three force measuring mechanisms, which are evenly arranged circumferentially on the rotating lifting platform.

[0011] Furthermore, the force measuring mechanism of this application includes a feed motor, a displacement sensor, a force sensor, and a lead screw guide mechanism; the feed motor is mounted on a rotary lifting platform and connected to the force sensor through the lead screw guide mechanism, and the displacement sensor is fixedly connected to the force sensor; the force sensor, driven by the feed motor, makes its top contact with the multi-layer multi-phase main contact mechanism to collect compression force data; the displacement sensor is used to collect compression distance data.

[0012] Furthermore, the rotating mechanism of this application includes a bearing and a rotating shaft sleeved in the bearing; the lower end of the rotating shaft is connected to a rotary motor, and the upper end is connected to a rotary lifting platform.

[0013] Furthermore, the lifting motor of this application is connected to the rotary lifting platform via a coupling.

[0014] Furthermore, the force sensor in this application is a miniature weighing force sensor, and the displacement sensor is a laser displacement sensor.

[0015] Secondly, this application provides a method for detecting the preload state of the main contacts of an on-load tap changer, comprising the following steps:

[0016] Step 1: Arrange the force measuring mechanism and ensure that the force sensor in the force measuring mechanism is on the same horizontal plane as the main contact at the top layer of phase A of the main contact mechanism.

[0017] Step 2: Start the feed motor in the force measuring mechanism to push the force sensor to contact the main contact and measure the spring compression force, while the displacement sensor measures the spring compression distance.

[0018] Step 3: Control the feed motor to continuously push the compression main contact until the limit distance is reached. At the same time, the force sensor stops counting and the displacement sensor stops counting.

[0019] Step 4: Control the feed motor to reset, drive the force measuring mechanism to the initial position, and at the same time start the rotating mechanism to drive the force measuring mechanism to switch to the next phase;

[0020] Step 5: Determine if the current force measuring mechanism is in phase A. If not, repeat steps 2 to 4. If it is in phase A, determine if the current force measuring mechanism is at the bottom of the main contacts. If it is not at the bottom, start the lifting mechanism to move the force measuring mechanism to the next layer, so that the force sensor in the force measuring mechanism is on the same horizontal plane as the main contacts at the bottom of phase A, and repeat steps 2 to 4. If it is already at the bottom, end the measurement and return to the initial position.

[0021] Furthermore, this application obtains the spring compression force-compression distance characteristic curve based on the spring compression force and spring compression distance, calculates the main contact pre-compression force and pre-compression distance based on the compression force-compression distance characteristic curve, and determines the pre-tightening state of the main contact based on the main contact pre-compression force and pre-compression distance.

[0022] Compared with the prior art, this application has the following beneficial effects:

[0023] This application solves the problem of convenient measurement of the preload state of multi-layer and multi-phase contacts in the main contact mechanism of on-load tap changers by organizing a reasonable measurement method. The measurement method proposed in this application can effectively improve the efficiency and reliability of the detection of the preload state of the main contacts in on-load tap changers. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a geometric model diagram of the main contacts of an on-load tap changer.

[0026] Figure 2 This is a diagram showing the position of the spring at the end of the main contact of an on-load tap changer.

[0027] Figure 3 This is a model diagram of the overall layout of the measuring device in the main contacts of an on-load tap changer.

[0028] Figure 4 This is a geometric model diagram of a lifting mechanism.

[0029] Figure 5 This is a geometric model diagram of a force measuring mechanism.

[0030] Figure 6 This is a geometric model diagram of a rotating mechanism.

[0031] Figure 7This is a flowchart of the detection method proposed in this application.

[0032] Among them, 1-detection spring, 2-force measuring mechanism, 3-rotation mechanism, 4-lifting mechanism, 5-feed motor, 6-force sensor, 7-movement sensor, 8-screw guide mechanism, 9-top, 10-bearing, 11-rotation shaft, 12-lifting motor, 13-coupling, 14-lifting outer frame, 15-rotation lifting platform. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0035] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0036] In the description of the embodiments of this application, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0037] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0038] In the description of the embodiments of this application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0039] The present application will now be described in further detail with reference to the accompanying drawings:

[0040] See Figure 3 This application discloses a device for detecting the preload state of the main contacts of an on-load tap changer, including a lifting mechanism 4, a force measuring mechanism 2, and a rotating mechanism 3. For example... Figure 4 As shown, the lifting mechanism 4 includes a lifting outer frame 14, and a rotating lifting platform 15 is arranged inside the lifting outer frame 14. The rotating lifting platform 15 can move longitudinally within the lifting outer frame 14 under the drive of the lifting motor 12. The force measuring mechanism 2 is installed on the rotating lifting platform 15. The lifting outer frame 14 can extend into the middle of the main contact of the on-load tap changer, so that the force measuring mechanism 2 can apply force to the spring 1 of the multi-layer multi-phase main contact mechanism of the main contact of the on-load tap changer and collect compression force data and compression distance data. The rotating mechanism 3 is installed below the lifting mechanism 4 and is used to drive the rotating lifting platform 15 to rotate, so that the force measuring mechanism 2 can rotate within the lifting outer frame 14.

[0041] In practical applications, such as Figure 5 As shown, three force measuring mechanisms 2 are evenly arranged circumferentially on the rotary lifting platform 15. The force measuring mechanism 2 includes a feed motor 5, a displacement sensor 7, a force sensor 6, and a lead screw guide mechanism 8. The feed motor 5 is mounted on the rotary lifting platform 15 and connected to the force sensor 6 via the lead screw guide mechanism 8. The displacement sensor 7 is fixedly connected to the force sensor 6. Driven by the feed motor 5, the force sensor 6's top head 9 contacts the multi-layer multi-phase main contact mechanism to collect compression force data. The displacement sensor 7 is used to collect compression distance data.

[0042] It should be noted that the force sensor 6 in this application is a miniature weighing force sensor, and the displacement sensor 7 is a laser displacement sensor.

[0043] In practical applications, such as Figure 6 As shown, the rotating mechanism 3 includes a bearing 10 and a rotating shaft 11 sleeved within the bearing 10; the lower end of the rotating shaft 11 is connected to a rotary motor, and the upper end is connected to a rotary lifting platform 15. The lifting motor 12 is connected to the rotary lifting platform 15 via a coupling 13.

[0044] See Figure 7 This application discloses a method for detecting the preload state of the main contacts of an on-load tap changer, comprising the following steps:

[0045] Step 1: Arrange the force measuring mechanism 2, ensuring that the force sensor in the force measuring mechanism 2 is aligned with the top-level main contact mechanism of phase A on the same horizontal plane. Simultaneously, measure the compression force and compression distance curve of the spring at the end of the top-level main contact mechanism of phase A. The force measuring mechanism 2 mainly consists of a feed motor 5, a displacement sensor, and a force sensor.

[0046] Step 2: Start the feed motor 5 in the force measuring mechanism 2 to push the force sensor to contact the main contact mechanism and start counting to measure the compression force. At the same time, the displacement sensor starts to measure the compression distance.

[0047] Step 3: The feed motor 5 continues to advance the compression main contact mechanism until the limit distance is reached. When the force sensor stops reading and acquires the recorded spring compression force data, the displacement sensor stops counting and acquires the spring compression distance data.

[0048] Step 4: The feed motor 5 resets, driving the force measuring mechanism 2 to its initial position. The rotating mechanism 3 starts, driving the force measuring mechanism 2 to switch to the next phase. The rotating mechanism 3 mainly consists of bearings, a rotary motor, and a rotating shaft 11.

[0049] Step 5: Determine if the current force measuring mechanism 2 is in phase A. If not, repeat steps 2-4 of the above measurement process for force measuring mechanism 2. If it is in phase A, further determine if the current force measuring mechanism 2 is at the bottom layer. If not at the bottom layer, activate the lifting mechanism 4 to move the force measuring mechanism 2 to the next layer, so that the force sensor in the force measuring mechanism 2 is on the same horizontal plane as the main contact mechanism of the lower layer of phase A, and repeat steps 2-4 of the measurement process. If it is already at the bottom layer, end the measurement, and the entire force measuring mechanism 2 returns to its initial position. The lifting mechanism 4 mainly consists of a lifting motor 12 and a coupling 13.

[0050] In practical applications, step 5 will be divided into two processes for judgment, ultimately realizing the measurement sequence of upper A phase, upper B phase, upper C phase, ..., lower A phase, lower B phase, lower C phase, ..., thereby completing the pre-tightening state measurement of all main contact mechanisms of the main contact mechanism.

[0051] Example

[0052] This application uses the measurement of the preload state of the end spring of a multi-layer, multi-phase main contact mechanism of an on-load tap changer as an example for illustration. The measurement steps are as follows:

[0053] See Figure 3A measuring device is arranged in the main contacts of the on-load tap changer. The measuring device mainly includes three force measuring mechanisms 2 arranged symmetrically, a rotating mechanism 3 located at the bottom, and a lifting mechanism 4.

[0054] See Figure 5 A force measuring mechanism 2 consists of a feed motor 5, a displacement sensor 7, a force sensor 6, and a lead screw and guide rail mechanism 8. This force measuring mechanism 2 is symmetrically arranged on the main contacts of an on-load tap changer. During measurement, the feed motor 5 in the force measuring mechanism 2 is activated, driving the top head 9 of the force sensor 6 to contact the main contact mechanism and collect compression force data. Simultaneously, the displacement sensor 7 emits a laser and receives the reflected laser from the rear baffle, collecting compression distance data. Measurement stops when the sensor is pushed to its limit position. The force sensor 6 is a miniature gravity sensor, and the displacement sensor 7 is a laser displacement sensor.

[0055] After the force measuring mechanism 2 completes one measurement, the rotating mechanism 3 is activated. (See below) Figure 6 The rotating mechanism 3 is mainly composed of an ultra-precision angular contact ball bearing 10SKF 7022ACDGA / P4A, a rotating shaft 11, and a rotating motor. It mainly drives the force measuring mechanism 2 to switch to the next phase position of the main contact mechanism.

[0056] After the force measuring mechanism 2 completes the measurement of the first-layer main contact mechanism, the lifting mechanism 4 is activated. (See below) Figure 4 The lifting mechanism 4 mainly consists of a lifting motor 12, a coupling 13 and a lifting outer frame 14, which drives the force measuring mechanism 2 to move to the next layer position of the main contact mechanism, and finally completes the measurement of the spring preload state of the multiphase multilayer main contact mechanism.

[0057] The object being measured is the spring at the end of the main contact mechanism contact, which serves to store and release energy, ensuring that the on-load tap changer completes normal switching operations.

[0058] The collected data are the compression force and compression distance of the spring in the main contact mechanism, which can form the corresponding compression force-compression distance characteristic curve of the spring. The pre-compression force and pre-compression distance data of the main contact mechanism can be obtained to determine whether the pre-tightening state of the main contact mechanism is normal.

[0059] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A device for detecting the preload state of the main contacts of an on-load tap changer, characterized in that, include: The lifting mechanism (4) includes a lifting outer frame (14), and a rotating lifting platform (15) is provided inside the lifting outer frame (14). The rotating lifting platform (15) can move longitudinally within the lifting outer frame (14) under the drive of the lifting motor (12). Force measuring mechanism (2), the force measuring mechanism (2) is installed on the rotary lifting platform (15), the lifting outer frame (14) can extend into the middle of the main contact of the on-load tap changer, so that the force measuring mechanism (2) can apply force to the spring of the multi-layer multi-phase main contact mechanism of the main contact of the on-load tap changer, and collect compression force data and compression distance data; the force measuring mechanism (2) includes a feed motor (5), a displacement sensor (7), a force sensor (6) and a lead screw guide mechanism (8); the feed motor (5) is installed on the rotary lifting platform (15) and connected to the force sensor (6) through the lead screw guide mechanism (8), and the displacement sensor (7) is fixedly connected to the force sensor (6); the force sensor (6) is driven by the feed motor (5) so that the top head (9) of the force sensor (6) contacts the multi-layer multi-phase main contact mechanism to collect compression force data; the displacement sensor (7) is used to collect compression distance data; The rotating mechanism (3) is installed below the lifting mechanism (4) and is used to drive the rotating lifting platform (15) to rotate so that the force measuring mechanism (2) can rotate within the lifting outer frame (14). The rotating mechanism (3) includes a bearing (10) and a rotating shaft (11) sleeved in the bearing (10). The lower end of the rotating shaft (11) is connected to a rotating motor, and the upper end is connected to the rotating lifting platform (15).

2. The on-load tap changer main contact preload state detection device according to claim 1, characterized in that, The force measuring mechanism (2) is provided in three parts, which are evenly arranged on the rotating lifting platform (15) along the circumference.

3. The on-load tap changer main contact preload state detection device according to claim 1, characterized in that, The lifting motor (12) is connected to the rotary lifting platform (15) via a coupling (13).

4. The on-load tap changer main contact preload state detection device according to claim 1, characterized in that, The force sensor (6) is a miniature weighing force sensor (6), and the displacement sensor (7) is a laser displacement sensor (7).

5. A method for detecting the preload state of the main contacts of an on-load tap changer using the device described in any one of claims 1-4, characterized in that, Includes the following steps: Step 1: Arrange the force measuring mechanism (2) and make the force sensor (6) in the force measuring mechanism (2) and the main contact of the top layer of the main contact mechanism A on the same horizontal plane; Step 2: Start the feed motor (5) in the force measuring mechanism (2) to push the force sensor (6) to contact the main contact and measure the spring compression force. At the same time, the displacement sensor (7) measures the spring compression distance. Step 3: Control the feed motor (5) to continuously push the compression main contact until the limit distance is reached. At the same time, the force sensor (6) stops counting, and the displacement sensor (7) stops counting. Step 4: Control the feed motor (5) to reset, drive the force measuring mechanism (2) to the initial position, and at the same time start the rotating mechanism (3) to drive the force measuring mechanism (2) to switch to the next phase; Step 5: Determine whether the current force measuring mechanism (2) is in phase A. If not, repeat steps 2 to 4. If it is in phase A, determine whether the current force measuring mechanism (2) is at the bottom of the main contact. If it is not at the bottom, start the lifting mechanism (4) to move the force measuring mechanism (2) to the next layer, so that the force sensor (6) in the force measuring mechanism (2) is on the same horizontal plane as the main contact of the lower layer of phase A, and repeat steps 2 to 4. If it is already at the bottom, end the measurement and return to the initial position.

6. The method for detecting the preload state of the main contacts of an on-load tap changer according to claim 5, characterized in that, The spring compression force-compression distance characteristic curve is obtained based on the spring compression force and spring compression distance. The pre-compression force and pre-compression distance of the main contact are calculated based on the compression force-compression distance characteristic curve. The pre-tightening state of the main contact is determined based on the pre-compression force and pre-compression distance of the main contact.

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