High-voltage direct-current gil three-column insulator surface charge measuring platform and measuring method

Abstract

The application discloses a high-voltage direct-current GIL three-column insulator surface charge measuring platform and a measuring method. The measured three-column insulator is moved to a preset range of an electrostatic probe through a control moving device, a position control device of the electrostatic probe is controlled to make the electrostatic probe rotate around the central axis of the measured three-column insulator and the probe support synchronous rotation, and the electrostatic probe is perpendicular to the measured three-column insulator at the same time, the movement of the electrostatic probe along the central axis of the measured three-column insulator is realized, the angle between the electrostatic probe and the surface of the measured three-column insulator is adjusted, and the measurement of the surface charge of the whole measured three-column insulator is completed. Therefore, the accuracy of the surface charge measurement of the three-column insulator is improved.

Description

Technical Field

[0001] This application relates to the field of surface charge measurement technology, and in particular to a high-voltage DC GIL three-post insulator surface charge measurement platform and measurement method. Background Technology

[0002] The insulation system of a gas-insulated transmission line (GIL) consists of insulators and insulating gas. Insulators are classified into basin insulators and three-post insulators, primarily used to support the central conductor and maintain its insulation to ground. GIL insulators are made of high-resistivity epoxy resin doped with Al₂O₃ and are widely used in AC GILs. However, due to surface charge accumulation, DC GIL insulators remain a key factor restricting their development. This is mainly because the surface charge dissipates extremely slowly, easily leading to surface flashover. Therefore, to reveal the surface charge distribution characteristics of insulators, it is necessary to establish a surface charge measurement platform.

[0003] Accurate measurement of surface charge distribution on insulators is a prerequisite for studying charge accumulation. Compared to basin insulators, three-post insulators cannot achieve gas-tight seals between GIL units, resulting in their limited use. Furthermore, the geometric structure of three-post insulators is complex. Therefore, the observation of surface charge on three-post insulators lags behind that of basin insulators. Li Weiguo et al. created measurement chambers on both the upper and lower sides of the test chamber, and used a charge scanning control mechanism to adjust the axial position of the measurement probe in real time, combined with a rotation controller, to achieve the measurement of surface charge in the leg area of ​​the post insulator. In addition, to measure the surface charge in the belly area of ​​the post insulator, an electrostatic probe rail was laid in the lower measurement chamber. Therefore, this measurement system can measure the surface charge of the entire three-post insulator.

[0004] To improve measurement accuracy, the distance between the electrostatic probe and the surface of the insulator under test is only about 3 mm. Therefore, the electric field around the insulator surface is inevitably affected by the probe support, thus reducing measurement accuracy. Furthermore, the charge distribution on the insulator surface depends on the surrounding electric field distribution. Opening measurement cavities on the upper and lower sides of the test chamber alters the initial coaxial cylindrical structure, easily distorting the original electric field distribution. Therefore, the accuracy of the measurement system is relatively low.

[0005] The three-post insulator surface charge measurement platform proposed in this invention adjusts the probe's scanning trajectory based on an electrostatic probe position control system, simplifying the probe support and reducing its impact on the measurement results. The use of a T-shaped test conduit avoids interference with the electric field around the insulator, thereby improving measurement accuracy. Summary of the Invention

[0006] This application provides a high-voltage DC GIL three-post insulator surface charge measurement platform and measurement method, which improves the accuracy of surface charge measurement of three-post insulators.

[0007] The first aspect of this application provides a high-voltage DC GIL three-post insulator surface charge measurement platform, comprising: a moving device for controlling the movement of the three-post insulator under test; an electrostatic probe position control device for controlling the position of the electrostatic probe, enabling the electrostatic probe to move axially along the three-post insulator under test and rotate around the three-post insulator under test; a probe bracket, one end of which is mounted with the electrostatic probe, and the other end of which is connected to the electrostatic probe position control device for adjusting the angle between the electrostatic probe and the surface of the three-post insulator under test; and a control component connected to the moving device and the electrostatic probe position control device for controlling... The moving device moves the three-post insulator under test to a preset range of the electrostatic probe. The electrostatic probe position control device controls the electrostatic probe to rotate around the central axis of the three-post insulator under test, and the probe support rotates synchronously while the electrostatic probe is perpendicular to the three-post insulator under test. This allows the electrostatic probe to move along the central axis of the three-post insulator under test. By adjusting the angle between the electrostatic probe and the surface of the three-post insulator under test, the measurement of the surface charge of the entire three-post insulator under test is completed. A data acquisition system is used to collect the surface charge of the three-post insulator under test collected by the electrostatic probe and display the surface charge.

[0008] Optionally, in one embodiment of this application, the moving device includes: a horizontal slide rail; a grounding ring disposed on the horizontal slide rail and moving horizontally along the horizontal slide rail; a central guide rod embedded inside a high-voltage guide rod, disposed above the horizontal slide rail and parallel to the horizontal slide rail, one end of the central guide rod being provided with a supporting three-post insulator, the supporting three-post insulator being vertically disposed and rigidly connected to the grounding ring, the other end of the central guide rod being provided with the tested three-post insulator, the tested three-post insulator being vertically disposed and slidably connected to the grounding ring via rollers.

[0009] Optionally, in one embodiment of this application, the electrostatic probe position control device includes: an X-axis slide rail; a Y-axis slide rail connected to and perpendicular to the X-axis slide rail, which controls the rotation of the electrostatic probe around the three-post insulator under test via the Y-axis slide rail and the X-axis slide rail; and a Z-axis slide rail connected to the Y-axis slide rail, which controls the movement of the electrostatic probe along the axial direction of the post under test.

[0010] Optionally, in one embodiment of this application, the probe holder and the electrostatic probe are electrically insulated from each other by an epoxy resin sheet.

[0011] Optionally, in one embodiment of this application, the probe bracket is a hollow aluminum alloy tube.

[0012] Optionally, in one embodiment of this application, the control component includes: a first stepper motor, which is mounted on the X-axis slide rail. The rotation axis of the first stepper motor is rigidly connected to the probe bracket, controlling the probe bracket to rotate and drive the electrostatic probe, so that the effective measurement area of ​​the electrostatic probe is always located on the surface of the three-post insulator under test.

[0013] Optionally, in one embodiment of this application, the data acquisition system includes: a Trek electrostatic voltmeter for outputting the surface charge acquired by the electrostatic probe; and an oscilloscope for displaying the surface charge.

[0014] Optionally, in one embodiment of this application, it further includes: a T-shaped test pipe, wherein the measuring platform is disposed inside the T-shaped test pipe.

[0015] The second aspect of this application provides a method for measuring the surface charge of a high-voltage DC GIL three-post insulator. Utilizing the high-voltage DC GIL three-post insulator surface charge measurement platform described in the above embodiment, before measurement, the external voltage is disconnected and the high-voltage conductor is grounded. The measurement method includes the following steps: controlling a moving device to move the three-post insulator to be measured within a preset range of an electrostatic probe; controlling an electrostatic probe position control device to move the electrostatic probe to a preset distance position on the three-post insulator, and controlling the electrostatic probe to rotate around the central axis of the leg region of the three-post insulator while simultaneously controlling the probe support to rotate, thus completing the circumferential surface charge measurement of the leg region of the three-post insulator; controlling the electrostatic probe position control device to adjust the angle of the electrostatic probe on the surface of the three-post insulator, and controlling the electrostatic probe to move horizontally along the moving device to measure the surface charge of the belly region of the three-post insulator, thus completing the measurement of the entire surface charge of the three-post insulator.

[0016] Optionally, in one embodiment of this application, the method further includes: using a data acquisition system to collect and display the surface charge of the entire three-post insulator under test.

[0017] The high-voltage DC GIL three-post insulator surface charge measurement platform and method proposed in this application involves controlling a moving device to move the three-post insulator under test to a preset range of an electrostatic probe. The electrostatic probe position control device is then used to rotate the electrostatic probe around the central axis of the three-post insulator under test, and the probe support rotates synchronously while the electrostatic probe remains perpendicular to the three-post insulator under test. This movement of the electrostatic probe along the central axis of the three-post insulator under test, along with adjusting the angle between the electrostatic probe and the surface of the three-post insulator under test, completes the measurement of the surface charge of the entire three-post insulator under test.

[0018] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0019] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0020] Figure 1 This is a schematic diagram of a high-voltage DC GIL three-post insulator surface charge measurement platform provided according to an embodiment of this application;

[0021] Figure 2 This is a schematic diagram of a specific high-voltage DC GIL three-post insulator surface charge measurement platform provided according to an embodiment of this application;

[0022] Figure 3 This is a schematic diagram of an electrostatic probe measurement trajectory provided according to an embodiment of this application;

[0023] Figure 4 This is a flowchart of a method for measuring the surface charge of a high-voltage DC GIL three-post insulator according to an embodiment of this application. Detailed Implementation

[0024] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0025] Specifically, Figure 1 This is a schematic diagram of a high-voltage DC GIL three-post insulator surface charge measurement platform provided according to an embodiment of this application.

[0026] like Figure 1As shown, the high-voltage DC GIL three-post insulator surface charge measurement platform includes: a moving device 100, an electrostatic probe position control device 200, a probe bracket 300, a control component 400, and a data acquisition system 500.

[0027] The mobile device 100 is used to control the movement of the three-post insulator under test.

[0028] The electrostatic probe position control device 200 is used to control the position of the electrostatic probe, enabling the electrostatic probe to move along the axial direction of the three-post insulator under test and rotate around the three-post insulator under test.

[0029] The probe bracket 300 has an electrostatic probe mounted on one end and is connected to an electrostatic probe position control device on the other end, which is used to adjust the angle between the electrostatic probe and the surface of the three-post insulator being tested.

[0030] The control unit 400 is connected to the moving device and the electrostatic probe position control device. It is used to control the moving device to move the three-post insulator under test to the preset range of the electrostatic probe. The control device controls the electrostatic probe position control device so that the electrostatic probe rotates around the central axis of the three-post insulator under test and the probe support rotates synchronously. At the same time, the electrostatic probe is perpendicular to the three-post insulator under test, so that the electrostatic probe moves along the central axis of the three-post insulator under test. By adjusting the angle between the electrostatic probe and the surface of the three-post insulator under test, the measurement of the surface charge of the entire three-post insulator under test is completed.

[0031] The data acquisition system 500 is used to collect the surface charge of the three-post insulator under test collected by the electrostatic probe and to display the surface charge.

[0032] Combination Figure 2 As shown, the mobile device 100 includes:

[0033] Horizontal slide rail;

[0034] The grounding ring is set on a horizontal slide rail and moves horizontally along the horizontal slide rail;

[0035] The central guide rod is embedded inside the high-voltage guide rod and is positioned above and parallel to the horizontal slide rail. One end of the central guide rod is equipped with a supporting three-post insulator, which is vertically set and rigidly connected to the grounding ring. The other end of the central guide rod is equipped with the three-post insulator to be tested, which is vertically set and slidably connected to the grounding ring via rollers.

[0036] Insulator No. 1 is the insulator under test, and insulator No. 2 provides mechanical support for insulator No. 1. Insulator No. 1 is connected to the grounding ring via rollers, while insulator No. 2 is rigidly connected to the grounding ring. Grounding ring No. 2 is fixed to a horizontal slide rail, and its horizontal position is adjusted via a stepper motor. The central guide rod is embedded within the high-voltage guide rod, maintaining good contact at all times. Therefore, the horizontal movement of insulator No. 1 is achieved by using a horizontal slide rail to drive the central conductor through insulator No. 2.

[0037] Combination Figure 2 As shown, the electrostatic probe position control device includes:

[0038] X-axis slide rail;

[0039] The Y-axis slide rail is connected to the X-axis slide rail and is perpendicular to the X-axis slide rail. The electrostatic probe is controlled to rotate around the three-post insulator under test through the Y-axis slide rail and the X-axis slide rail.

[0040] The Z-axis slide rail is connected to the Y-axis slide rail, which controls the movement of the electrostatic probe along the axial direction of the column being measured.

[0041] Specifically, the electrostatic probe is mounted at the end of the probe holder, and is electrically insulated from the holder by an epoxy resin sheet. The initial installation angle of the electrostatic probe is perpendicular to the surface of the post insulator being measured. The probe holder is a hollow aluminum alloy tube, rigidly connected to the rotating shaft of a stepper motor. Using a hollow aluminum alloy tube as the probe holder simplifies the probe holder and reduces its influence on the measurement results. The stepper motor is mounted on the X-axis slide rail, and rotates the probe holder through this motor, thereby keeping the effective measurement area of ​​the electrostatic probe always located on the surface of the insulator being measured. The electrostatic probe position control system mainly depends on the X, Y, and Z-axis slide rails and the rotatable probe holder. The X and Y axes are vertically mounted on the Z-axis slide rail, and the X-axis is fixed to the Y-axis slide rail and perpendicular to the Y-axis. The Z-axis allows the electrostatic probe to move along the axial direction of the post insulator. Based on the X and Y axes, the electrostatic probe can rotate around the post insulator. Combined with the rotation of the probe holder, the surface charge of the post insulator leg area can be measured, such as... Figure 3 As shown.

[0042] Optionally, the control components include: a first stepper motor, which is mounted on the X-axis slide rail. The rotation shaft of the first stepper motor is rigidly connected to the probe bracket, controlling the rotation of the probe bracket and driving the electrostatic probe to keep the effective measurement area of ​​the electrostatic probe always located on the surface of the three-post insulator being measured.

[0043] To measure the surface charge in the web region of a three-post insulator, a lightweight 28-stepper motor is used at the end of the probe holder to adjust the angle of the electrostatic probe, ensuring that the probe is perpendicular to the insulator surface. The electrostatic probe moves along the central guide rod, thereby measuring the surface charge in the web region of the three-post insulator.

[0044] Optionally, the data acquisition system includes: a Trek electrostatic voltmeter for outputting the surface charge acquired by the electrostatic probe; and an oscilloscope for displaying the surface charge.

[0045] The data acquisition system 500 consists of a Trek electrostatic voltmeter and an oscilloscope. The potential of the measured surface acquired by the electrostatic probe is output by the electrostatic voltmeter to the oscilloscope for real-time storage.

[0046] Before each measurement, the external voltage is disconnected, and the high-voltage conductor is grounded. The No. 1 three-post is pushed out of the grounding ring via the No. 2 three-post using a horizontal slide rail, leaving it suspended. The electrostatic probe is driven by the Z-axis slide rail to a position 3mm from the insulator surface. Then, the electrostatic probe rotates around the central axis of the insulator leg area based on the XY-axis slide rails. Simultaneously, the probe holder rotates synchronously. After one circumferential measurement, the position of the electrostatic probe along the central axis of the insulator leg area is adjusted via the Z-axis to begin the next measurement. After the measurement of the insulator leg area is completed, the angle of the electrostatic probe is adjusted. Finally, the belly area of ​​the three-post insulator is measured along the central guide rod, thus achieving the measurement of the surface charge of the entire three-post insulator.

[0047] like Figure 2 As shown, it also includes a T-shaped test conduit, with the measurement platform set inside the T-shaped test conduit. Using a T-shaped test conduit avoids the influence of the measurement cavity on the electric field around the insulator and reduces the impact of the probe support on the measurement results, thereby improving the accuracy of the measurement.

[0048] The high-voltage DC GIL three-post insulator surface charge measurement platform proposed in this application uses a control moving device to move the three-post insulator under test to a preset range of the electrostatic probe. The electrostatic probe position control device controls the electrostatic probe to rotate around the central axis of the three-post insulator under test and the probe support to rotate synchronously while the electrostatic probe is perpendicular to the three-post insulator under test. This allows the electrostatic probe to move along the central axis of the three-post insulator under test. By adjusting the angle between the electrostatic probe and the surface of the three-post insulator under test, the measurement of the surface charge of the entire three-post insulator under test is completed.

[0049] Next, referring to the accompanying drawings, a method for measuring the surface charge of a high-voltage DC GIL three-post insulator according to an embodiment of this application is described.

[0050] Figure 4 This is a flowchart of a method for measuring the surface charge of a high-voltage DC GIL three-post insulator according to an embodiment of this application.

[0051] like Figure 4 As shown, before measurement, disconnect the external voltage, ground the high-voltage conductor, and the measurement method includes the following steps:

[0052] Step S101: Control the moving device to move the three-post insulator under test to the preset range of the electrostatic probe.

[0053] Step S102: Control the electrostatic probe position control device to move the electrostatic probe to a preset distance position on the three-post insulator under test, and control the electrostatic probe to rotate around the central axis of the leg area of ​​the three-post insulator under test while controlling the probe bracket to rotate, so as to complete the circumferential surface charge measurement of the leg area of ​​the three-post insulator under test.

[0054] Step S103: Control the electrostatic probe position control device to adjust the angle of the electrostatic probe on the surface of the three-post insulator under test, and control the electrostatic probe to move horizontally along the moving device to measure the surface charge of the belly area of ​​the three-post insulator under test, thus completing the measurement of the surface charge of the entire three-post insulator under test.

[0055] Optionally, in one embodiment of this application, the method for measuring the surface charge of a high-voltage DC GIL three-post insulator further includes: using a data acquisition system to collect and display the surface charge of the entire three-post insulator under test.

[0056] It should be noted that the foregoing explanation of the embodiment of the high-voltage DC GIL three-post insulator surface charge measurement platform also applies to the high-voltage DC GIL three-post insulator surface charge measurement method of this embodiment, and will not be repeated here.

[0057] According to the high-voltage DC GIL three-post insulator surface charge measurement method proposed in this application embodiment, the three-post insulator under test is moved to a preset range of the electrostatic probe; the electrostatic probe is moved to a preset distance position of the three-post insulator under test, and while controlling the electrostatic probe to rotate around the central axis of the leg area of ​​the three-post insulator under test, the probe support is controlled to rotate to complete the circumferential surface charge measurement of the leg area of ​​the three-post insulator under test; the angle of the electrostatic probe on the surface of the three-post insulator under test is adjusted, and the electrostatic probe is controlled to move horizontally along the moving device to measure the surface charge of the belly area of ​​the three-post insulator under test, thus completing the measurement of the surface charge of the entire three-post insulator under test.

[0058] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0059] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0060] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more N executable instructions for implementing custom logic functions or processes, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.

Claims

1. A high-voltage DC GIL three-post insulator surface charge measurement platform, characterized in that, include: A mobile device used to control the movement of the three-post insulator under test; An electrostatic probe position control device is used to control the position of the electrostatic probe, enabling the electrostatic probe to move along the axial direction of the three-post insulator under test and to rotate around the three-post insulator under test; A probe bracket, one end of which is fitted with the electrostatic probe and the other end is connected to the electrostatic probe position control device, used to adjust the angle between the electrostatic probe and the surface of the three-post insulator under test; A control component, connected to the moving device and the electrostatic probe position control device, is used to control the moving device to move the three-post insulator under test to a preset range of the electrostatic probe, and to control the electrostatic probe position control device so that the electrostatic probe rotates around the central axis of the three-post insulator under test and the probe support rotates synchronously while the electrostatic probe is perpendicular to the three-post insulator under test, so that the electrostatic probe moves along the central axis of the three-post insulator under test. By adjusting the angle between the electrostatic probe and the surface of the three-post insulator under test, the measurement of the surface charge of the entire three-post insulator under test is completed. The data acquisition system is used to collect the surface charge of the three-post insulator under test collected by the electrostatic probe and to display the surface charge; The mobile device includes: Horizontal slide rail; A grounding ring is disposed on the horizontal slide rail and moves horizontally along the horizontal slide rail; A central guide rod is embedded inside the high-voltage guide rod, positioned above and parallel to the horizontal slide rail. One end of the central guide rod is equipped with a supporting three-post insulator, which is vertically positioned and rigidly connected to the grounding ring. The other end of the central guide rod is equipped with the three-post insulator under test, which is vertically positioned and slidably connected to the grounding ring via rollers. Also includes: The measuring platform is located inside the T-shaped test pipe.

2. The platform according to claim 1, characterized in that, The electrostatic probe position control device includes: X-axis slide rail; The Y-axis slide rail is connected to the X-axis slide rail and is perpendicular to the X-axis slide rail. The Y-axis slide rail and the X-axis slide rail control the rotation of the electrostatic probe around the three-post insulator under test. The Z-axis slide rail is connected to the Y-axis slide rail and controls the movement of the electrostatic probe along the axial direction of the column being measured.

3. The platform according to claim 1, characterized in that, The probe holder and the electrostatic probe are electrically insulated from each other by an epoxy resin sheet.

4. The platform according to claim 3, characterized in that, The probe bracket is a hollow aluminum alloy tube.

5. The platform according to claim 2, characterized in that, The control component includes: The first stepper motor is mounted on the X-axis slide rail. The rotation shaft of the first stepper motor is rigidly connected to the probe bracket. The probe bracket is controlled to rotate and drive the electrostatic probe, so that the effective measurement area of ​​the electrostatic probe is always located on the surface of the three-post insulator being measured.

6. The platform according to claim 5, characterized in that, The data acquisition system includes: The Trek electrostatic voltmeter is used to output the surface charge collected by the electrostatic probe. An oscilloscope is used to display surface charges.

7. A method for measuring the surface charge of a high-voltage DC GIL three-post insulator, characterized in that, Using the high-voltage DC GIL three-post insulator surface charge measurement platform according to any one of claims 1-6, before measurement, the external voltage is disconnected and the high-voltage conductor is grounded. The measurement method includes the following steps: The control and movement device moves the three-post insulator under test to the preset range of the electrostatic probe; The electrostatic probe position control device moves the electrostatic probe to a preset distance position on the three-post insulator under test, and controls the electrostatic probe to rotate around the central axis of the leg area of ​​the three-post insulator under test while controlling the probe bracket to rotate, thereby completing the circumferential surface charge measurement of the leg area of ​​the three-post insulator under test. The electrostatic probe position control device is controlled to adjust the angle of the electrostatic probe on the surface of the three-post insulator under test, and the electrostatic probe is controlled to move horizontally along the moving device to measure the surface charge of the belly area of ​​the three-post insulator under test, thereby completing the measurement of the surface charge of the entire three-post insulator under test.

8. The method according to claim 7, characterized in that, Also includes: The surface charge of the entire three-post insulator under test is collected using a data acquisition system and displayed.

Images