Device and method for representing uniformity degree of nonlinear anti-corona material of large-scale high-voltage motor

Abstract

The invention relates to the technical field of high-voltage motors, in particular to a device and a method for characterizing the uniformity of a nonlinear anti-corona material of a large-scale high-voltage motor. According to the large-scale high-voltage motor nonlinear anti-corona material uniformity characterization device and method provided by the invention, high voltage is applied to the material in the darkroom in the shell, and the probe measures the frequency of the wavelength of radiation light emitted by the material due to electron-hole recombination under the high voltage; the forbidden bandwidth of the nonlinear anti-corona material of the large-scale high-voltage motor is obtained through calculation according to a photon energy formula, the insulating capacity of the nonlinear anti-corona material of the large-scale high-voltage motor is evaluated on the microscopic level, the closer the forbidden bandwidth is, the higher the degree of uniformity is, and otherwise, the lower the degree of uniformity is. According to the method, the microscopic quantum-level characterization of the insulating capacity of the nonlinear anti-corona material of the large-scale high-voltage motor is realized, the influence of the nonlinear anti-corona material of the large-scale high-voltage motor on the forbidden band width when the filler doping content is changed is determined, and guidance is provided for understanding the microscopic characteristics and material modification optimization of the nonlinear anti-corona material of the large-scale high-voltage motor.

Description

Technical Field

[0001] The present invention relates to the technical field of large-scale high-voltage motors, and in particular to a device and method for characterizing the uniformity of nonlinear anti-corona materials of large-scale high-voltage motors. Background Art

[0002] Nonlinear anti-corona materials are often made into anti-corona tapes and wrapped around the ends of the stator bars of large high-voltage motors. This utilizes the nonlinear conductivity properties of semiconductor materials doped into the insulating matrix to homogenize the electric field distribution on the surface of the bar ends, thereby preventing corona discharge. However, when the uniformity of the doping filler is inconsistent, different locations will exhibit different nonlinear characteristics, resulting in an uneven electric field distribution at the ends of the bar. Furthermore, characterization and testing of nonlinear anti-corona materials for large high-voltage motors mostly rely on macroscopic and mesoscopic methods, lacking microscopic quantum-level characterization methods, making it difficult to characterize the bandgap width of nonlinear anti-corona materials for large high-voltage motors.

[0003] To address this phenomenon, the present invention proposes a method for characterizing the uniformity of nonlinear anti-corona materials for large-scale high-voltage motors. Compared to traditional methods, this method can characterize nonlinear anti-corona materials for large-scale high-voltage motors at a microscopic quantum level, clarifying the uniformity of their filler doping. This method improves the microscopic understanding of nonlinear anti-corona materials for large-scale high-voltage motors and provides guidance for their modification methods. Summary of the Invention

[0004] To address the aforementioned technical issues, the present invention provides a device and method for characterizing the uniformity of nonlinear anti-corona materials for large-scale high-voltage motors. By applying a controlled high voltage to the material in a darkroom within a housing, a probe measures the frequency of the wavelength of radiation emitted by the material due to electron-hole recombination under high voltage, and calculates the bandgap width of the nonlinear anti-corona material for large-scale high-voltage motors based on a photon energy formula, the device and method evaluate the insulation capability of the nonlinear anti-corona material for large-scale high-voltage motors at a microscopic level. This device and method achieve microscopic quantum-level characterization of the insulation capability of nonlinear anti-corona materials for large-scale high-voltage motors, clarifying the impact of changes in filler doping content on the bandgap width of nonlinear anti-corona materials for large-scale high-voltage motors, and providing guidance for understanding their microscopic properties and material modification and optimization.

[0005] In order to achieve the above-mentioned purpose of the invention, the present invention provides a device for characterizing the uniformity of nonlinear anti-corona materials of large high-voltage motors, including a ground electrode and a high-voltage electrode arranged in a shell, the shell and the electrodes constituting a darkroom pressurizing device, characterized in that a round rod is provided at the upper end of the shell, and a test sample made of nonlinear anti-corona material is provided on the lower side of the shell, the high-voltage electrode is connected to a host computer via a high-voltage electrical wire to apply a controlled high voltage to the sample to be tested, and the host computer is electrically connected to a spectrometer via a high-voltage wire and a signal transmission line respectively.

[0006] Preferably, the housing is made of epoxy resin material and has a sealed structure.

[0007] Preferably, the body of the ground electrode is provided with an inner cavity, and the upper side of the side wall of the body is provided with a first terminal.

[0008] Preferably, the inner cavity is a cylindrical structure.

[0009] Preferably, the pole body of the high-voltage electrode is a cylinder, a second terminal is provided on the upper side of the cylinder, and a second through hole is provided on the second terminal.

[0010] Preferably, the spectrometer probe is arranged on the side wall inside the shell that serves as a darkroom, and the straight line formed by the two points of the spectrometer and the center of the ground electrode is not blocked by the electrodes inside the darkroom and the shell structure. The radiated light can be received by the detection module of the spectrometer without being blocked, and the spectrometer probe outputs the signal to the host computer through the spectrometer.

[0011] Preferably, the inner surface of the shell is coated with a high light absorption material, and the inner surface of the shell serving as a darkroom is provided with wrinkles.

[0012] The present invention also provides a method for characterizing the uniformity of a nonlinear anti-corona material of a large high-voltage motor, comprising the following steps:

[0013] Step 1: Place the darkroom pressurizing device close to the surface of the test sample made of nonlinear anti-corona material of a large high-voltage motor, and apply high voltage to the test sample through electrodes;

[0014] Step 2: Under high voltage, use a spectrometer probe to measure the radiation light generated by electron-hole recombination of the test sample to obtain the frequency distribution of the radiation light generated by the test sample under high voltage;

[0015] Step 3: Calculate the band gap of the test sample based on the intrinsic and indirect transition characteristics of semiconductor electrons, and evaluate the uniformity of the test sample material from a quantum perspective;

[0016] Step 4: Move the darkroom pressurizing device close to the surface of the sample to be tested, at least 1 cm away from the original position to be tested, and repeat the above characterization test process. For the same material, the surface area is calculated as per 25 cm 2 Take measurements at more than 5 positions and compare the bandgap widths obtained from multiple tests to characterize the uniformity of the filler of the test sample. The closer the bandgap widths obtained from different tests are, the higher the uniformity of the nonlinear anti-corona material of the large high-voltage motor, and vice versa.

[0017] Preferably, the calculation formula for the bandgap width is: Among them, E gis the bandgap width, h is Planck’s constant, is the measured average photon frequency.

[0018] Preferably, the spectrometer probe is located on the side wall leading to the inside of the darkroom and is on the same straight line as the center of the ground electrode. It is not blocked by the internal electrodes of the darkroom and the shell made of epoxy resin material, ensuring that the radiated light can be received by the detection module of the spectrometer without obstruction. The spectrometer probe transmits signals to the host computer through a transmission line.

[0019] Compared with the existing ones, the present invention has the following beneficial effects:

[0020] 1. Compared with the existing macroscopic characterization methods such as conductivity testing and mesoscopic morphology characterization methods such as scanning electron microscopy testing, the present invention can characterize the insulation ability of nonlinear anti-corona materials for large high-voltage motors based on energy band theory;

[0021] 2. The present invention is beneficial to improving the microscopic understanding of nonlinear anti-corona materials for large high-voltage motors;

[0022] 3. The present invention can provide further guidance and instruction for the material modification of large high-voltage motors. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention.

[0024] Figure 1 This is the overall structural diagram of the device for characterizing the uniformity of nonlinear anti-corona materials for large-scale high-voltage motors according to the present invention;

[0025] Figure 2 for Figure 1 Structural diagram of the middle ground electrode;

[0026] Figure 3 for Figure 1 Structural diagram of medium and high voltage electrodes;

[0027] Figure 4 Flowchart of a method for characterizing the uniformity of nonlinear anti-corona materials for large high-voltage motors;

[0028] Figure 5 This is the frequency distribution diagram of the radiation light of the nonlinear anti-corona material for large-scale high-voltage motors of the present invention.

[0029] Reference numerals

[0030] In the figure, 1-shell, 2-ground electrode, 21-body, 22-inner cavity, 23-first terminal, 24-first through hole, 3-spectrometer, 4-ground wire, 5-signal transmission line, 6-host computer, 7-high-voltage wire, 8-round rod, 9-high-voltage electrode, 91-electrode body, 92-second terminal, 93-second through hole, 10-test sample. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0032] Example 1

[0033] like Figure 1 As shown, this embodiment provides a device for characterizing the uniformity of nonlinear anti-corona materials for large-scale high-voltage motors, including a ground electrode 2 and a high-voltage electrode 9 provided in a shell 1. The shell 1 and the electrodes constitute a darkroom pressurizing device. A round rod 8 is provided at the upper end of the shell 1. A test sample 10 made of nonlinear anti-corona material is provided on the lower side of the shell 1. The high-voltage electrode 9 is connected to the host computer 6 through a high-voltage electrical wire 7 to apply a controlled high voltage to the sample to be tested 10. The host computer 6 is electrically connected to the spectrometer 3 through a high-voltage wire 4 and a signal transmission line 5. In this embodiment, the shell 1 is made of epoxy resin material and is a closed structure, which has the function of a darkroom. As shown Figure 2 As shown, in this embodiment, the specific structure of the ground electrode 2 includes a body 21 having an inner cavity 21. The inner cavity 21 of the body 21 is a cylindrical structure. Two symmetrical first binding posts 23 are provided on the upper side of the side wall of the body 21. The first binding posts 23 are provided with a first through hole 24 to facilitate fixing the connecting wire.

[0034] In this embodiment, Figure 3 As shown, the pole body 91 of the high-voltage electrode 9 is a cylinder, a second terminal 92 is provided on the upper side of the cylinder, and a second through hole 93 is provided on the second terminal 92.

[0035] The spectrometer 7 probe is disposed on the side wall of the housing 1 serving as a darkroom, and the straight line formed by the probe and the center of the ground electrode 2 is not blocked by the electrodes or housing components inside the darkroom. The radiated light can be received by the detection module of the spectrometer 7 without obstruction, and the probe of the spectrometer 7 outputs the signal to the host computer 6 via the spectrometer 3. Preferably, the inner surface of the housing 1 is coated with a high-absorbency material, and the inner surface of the housing 1 serving as a darkroom is provided with wrinkles.

[0036] In this embodiment, the high-voltage electrode 9 in the darkroom pressurizing device is cylindrical and made of brass material, the upper end of the ground electrode is a hollow cylinder made of brass material, the round rod 8 is also made of brass material, and the brass round rod 8 is provided with a through circular hole; the epoxy resin base is a hollow cylinder and a solid cylinder coaxially stacked together, and the axis and boundary of the solid cylindrical part have a cylindrical hole, the depth of which is the same as the length of the round rod 8, and the normal inside the cylindrical hole also has a through circular hole structure, which cooperates with the through circular hole structure on the round rod 8, and an epoxy resin material round rod is used to penetrate it for fixation, wherein the end of the brass round rod is connected to a high-voltage wire to play the role of applying voltage to the test sample 10.

[0037] The present invention also provides a method for characterizing the uniformity of nonlinear anti-corona materials of large high-voltage motors. Figure 4 As shown, the following steps are included:

[0038] Step 1: Place the darkroom pressurizing device close to the surface of the test sample 10 made of nonlinear anti-corona material of a large high-voltage motor, and apply a high voltage to the test sample 10 through electrodes;

[0039] Step 2: Connect the high-voltage terminal of the detection device to an AC high-voltage power supply, and use a gradient voltage-boosting method to increase the voltage at a rate of 0.5 kV / min until the voltage on the sample is less than its breakdown voltage, and then increase the voltage to approximately 5 kV. Under high voltage, use the spectrometer 3 probe to measure the radiation light generated by electron-hole recombination on the test sample 10, and obtain the frequency distribution of the radiation light generated by the test sample 10 under high voltage.

[0040] Step 3: Calculate the band gap of the test sample 10 based on the intrinsic transition and indirect transition characteristics of semiconductor electrons, and evaluate the uniformity of the material of the test sample 10 from a quantum perspective;

[0041] Step 4: Move the darkroom pressurizing device close to the surface of the test sample 10, at least 1 cm away from the original test position, repeat the above characterization test process, and compare the band gap widths obtained from multiple tests to characterize the filler uniformity of the test sample 10. The closer the band gap widths obtained from different tests, the higher the uniformity of the nonlinear anti-corona material of the large high-voltage motor, and vice versa;

[0042] Step 5: Repeat steps 3-4 above 5-10 times, changing different batches of samples or adjusting the dripping parameters for testing.

[0043] The calculation formula of the bandgap width is: Among them, E g is the bandgap width, h is Planck’s constant, is the average frequency of photons, and the average frequency of the radiated light obtained.

[0044] Among them, the probe of the spectrometer 7 is located on the side wall of the darkroom and is on the same straight line as the center of the ground electrode 2. It is not blocked by the internal electrodes of the darkroom and the shell 1 made of epoxy resin material, ensuring that the radiated light can be received by the detection module of the spectrometer 7 without obstruction. The probe of the spectrometer 7 transmits signals with the host computer 10 through a transmission line.

[0045] In this embodiment, the measurement data of the spectrometer 7 is input into the desktop computer as the host computer 6 through the spectrometer signal transmission line. The computer records the measurement data of the spectrometer and obtains the frequency corresponding to the strongest radiation light, which is 6.46×10 14 Hz, bring in The calculated band gap energy is 4.28×10 -19 J, which is 2.675eV. After multiple measurements, the bandgap widths were 2.607eV, 2.665eV, 2.598eV, 2.692eV, and 2.683eV, respectively. As shown in Table 1 below, the frequency (Hz) and bandgap width (eV) corresponding to the peak optical power have minimal variation, indicating a high degree of uniformity in the nonlinear anti-corona material used in large high-voltage motors.

[0046] Table 1

[0047] Optical power peak corresponding frequency (Hz) Corresponding bandgap width (eV) <![CDATA[6.30×10 14 ]]> 2.607 <![CDATA[6.44×10 14 ]]> 2.665 <![CDATA[6.28×10 14 ]]> 2.598 <![CDATA[6.51×10 14 ]]> 2.692 <![CDATA[6.49×10 14 ]]> 2.683

[0048] like Figure 5 As shown, one of the test results of the optical frequency distribution of the nonlinear anti-corona material in this embodiment is: the vertical axis is the optical power of 0.0, 0.5 and 1.0, and the horizontal axis is the frequency: 6.40E+014Hz, 6.42E+014Hz, 6.44E+014Hz, 6.46E+014Hz, 6.48E+014Hz, 6.50E+014Hz and 6.40E+014Hz.

[0049] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0050] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A device for characterizing the uniformity of nonlinear anti-corona materials for large-scale high-voltage motors, comprising a housing (1) in which a ground electrode (2) and a high-voltage electrode (9) are arranged, wherein the housing (1) and the electrodes constitute a darkroom pressurizing device, characterized in that: A round rod (8) is provided at the upper end of the shell (1), a test sample (10) made of nonlinear anti-corona material is provided at the lower side of the shell (1), the high-voltage electrode (9) is connected to a host computer (6) via a high-voltage electrical wire (7) to apply a controlled high voltage to the sample to be tested (10), and the host computer (6) is electrically connected to a spectrometer (3) via a high-voltage wire (4) and a signal transmission line (5), respectively.

2. The device for characterizing uniformity of nonlinear anti-corona materials for large-scale high-voltage motors according to claim 1, characterized in that: The housing (1) is made of epoxy resin material and has a sealed structure.

3. The device for characterizing uniformity of nonlinear anti-corona materials for large-scale high-voltage motors according to claim 1, characterized in that: The body (21) of the ground electrode (2) is provided with an inner cavity (21), and the upper side of the side wall of the body (21) is provided with a first terminal (23).

4. The device for characterizing uniformity of nonlinear anti-corona materials for large high-voltage motors according to claim 1, characterized in that: The inner cavity (21) is a cylindrical structure.

5. The device for characterizing uniformity of nonlinear anti-corona materials for large-scale high-voltage motors according to claim 1, characterized in that: The pole body (91) of the high-voltage electrode (9) is a cylinder, a second terminal (92) is provided on the upper side of the cylinder, and a second through hole (93) is provided on the second terminal (92).

6. The device for characterizing uniformity of nonlinear anti-corona materials for large-scale high-voltage motors according to claim 1, characterized in that: The spectrometer (7) probe is arranged on the side wall inside the housing (1) that serves as a darkroom, and the straight line formed by the two points of the spectrometer and the center of the ground electrode (2) is not blocked by the electrodes inside the darkroom and the housing structure. The radiated light can be received by the detection module of the spectrometer (7) without being blocked, and the spectrometer (7) probe outputs the signal to the host computer (6) through the spectrometer (3).

7. The device for characterizing uniformity of nonlinear anti-corona materials for large-scale high-voltage motors according to claim 1, characterized in that: The inner surface of the shell (1) is coated with a high light absorption material, and the inner surface of the shell (1) serving as a darkroom is provided with wrinkles.

8. A method for characterizing the uniformity of nonlinear anti-corona materials for large-scale high-voltage motors according to any one of claims 1 to 7, comprising the following steps: Step 1: placing a darkroom pressurizing device close to the surface of a test sample (10) made of a large high-voltage motor nonlinear anti-corona material, and applying a high voltage to the test sample (10) through electrodes; Step 2: Under high voltage, use a spectrometer (3) probe to measure the radiation light generated by electron-hole recombination of the test sample (10), and obtain the frequency distribution of the radiation light generated by the test sample (10) under high voltage; Step 3: Calculate the band gap of the test sample (10) based on the intrinsic transition and indirect transition characteristics of semiconductor electrons, and evaluate the uniformity of the test sample (10) material from a quantum perspective; Step 4: Move the darkroom pressurizing device close to the surface of the sample to be tested (10), at least 1 cm away from the original position to be tested, and repeat the above characterization test process. For the same material, the surface area is adjusted according to the value of 25 cm. 2 The uniformity of the filler of the test sample (10) is characterized by measuring at more than 5 positions and comparing the bandgap widths obtained from multiple tests. The closer the bandgap widths obtained from different tests are, the higher the uniformity of the nonlinear anti-corona material of the large high-voltage motor is, and vice versa.

9. The method for characterizing the uniformity of nonlinear anti-corona materials of large-scale high-voltage motors according to claim 8, characterized in that: The calculation formula of the bandgap width is: Among them, E g is the bandgap width, h is Planck’s constant, is the measured average photon frequency.

10. The method for characterizing the uniformity of nonlinear anti-corona materials of large-scale high-voltage motors according to claim 8, characterized in that: The spectrometer (7) probe is located on the side wall of the darkroom and is on the same straight line as the center of the ground electrode (2). It is not blocked by the electrodes inside the darkroom and the housing (1) made of epoxy resin material, ensuring that the radiated light can be received by the detection module of the spectrometer (7) without being blocked. The spectrometer (7) probe transmits signals to the host computer (10) via a transmission line.

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