Performance verification device and method of photoelectric fusion sensor for GIS (Gas Insulated Switchgear) partial discharge detection
By designing the performance verification device of the photoelectric fusion sensor for GIS partial discharge detection, using distributed pulse current detection method and shielding chamber technology, the problems of high cost, inaccurate calibration results and timing in the existing technology are solved, and low-cost and high-performance photoelectric fusion sensor verification is achieved.
Patent Information
- Application Number
- CN202411743808.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-30
- Publication Date
- 2025-03-21
AI Technical Summary
The existing photoelectric fusion sensor calibration device is expensive, unable to provide a stable light environment and simulate the reflection characteristics of different objects, resulting in inaccurate calibration results and ineffective resolution of timing problems.
A performance verification device for photoelectric fusion sensor for GIS partial discharge detection is designed, including test voltage generation section, test section one and test section two. The distributed pulse current detection method is used to shield external interference noise through the shielding chamber to achieve effective performance verification of photoelectric fusion sensors.
It realizes low-cost and high-performance photoelectric fusion sensor calibration, improves detection sensitivity for extremely low discharge volume, ensures the accuracy and reliability of calibration results, and solves the timing problem.
Smart Images
Figure CN119667405A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of photoelectric fusion sensor calibration, and in particular relates to a performance calibration device and method for a photoelectric fusion sensor for GIS partial discharge detection. Background Art
[0002] Photoelectric fusion sensors are usually used to measure and detect various physical quantities, such as temperature, pressure, displacement, etc. In order to ensure the accuracy and reliability of the sensor output, it is necessary to perform performance calibration. Through calibration, the measurement accuracy and linearity of the sensor can be verified to ensure that its output is consistent with the actual physical quantity. Photoelectric fusion sensors may be affected by environmental factors such as temperature, humidity, vibration, etc. during long-term use. These factors may cause changes in the performance of the sensor, thereby affecting its measurement results. By performing performance calibration regularly, the drift or deviation of the sensor can be discovered and corrected in time to improve its stability and reliability. Photoelectric fusion sensors of different batches or models may have certain differences. In order to ensure consistent measurement results between different sensors, performance calibration is required. Through calibration, the differences between sensors can be eliminated and the consistency of their output can be guaranteed.
[0003] At present, calibration is performed using a known reference source or calibration equipment, such as using a thermostat with a known temperature to calibrate a temperature sensor. When verifying performance, appropriate test equipment, such as a signal generator, power supply, oscilloscope, multimeter, etc., is generally used to perform performance testing and verification. Photoelectric sensors involve many aspects of technology such as photoelectric devices, circuit design, and signal processing, and their manufacturing cost is relatively high. Therefore, the existing verification device may also have the problem of high cost, which may limit its wide application. The working principle of the photoelectric sensor is closely related to the light environment and the light reflection characteristics of the surface of the object. If the verification device cannot provide a stable light environment or cannot simulate the reflection characteristics of different object surfaces, the verification result may be inaccurate. And the data of different sensors are collected at different rates and timestamps, resulting in data inconsistency and timing problems. If the verification device cannot solve the timing problem, the verification result may be inaccurate. Therefore, whether it is possible to provide a performance verification device and method for a photoelectric fusion sensor for GIS partial discharge detection that is low in cost, has high performance verification quality, and can shield external interference noise is a technical problem to be solved by the present invention. Summary of the invention
[0004] In view of this, the present invention provides a performance verification device and method for a photoelectric fusion sensor for GIS partial discharge detection.
[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: A performance verification device for a photoelectric fusion sensor for GIS partial discharge detection, the performance verification device is placed in a shielded room, and the performance verification device includes a test voltage generation section, a test section 1 and a test section 2: The test voltage generating section includes a non-partial discharge test transformer and a test protection resistor, which are used to generate the voltage required to cause partial discharge at the defect location; The test section 1 is a straight GIS busbar section equipped with a first photoelectric fusion sensor installation flange window and a first defect replacement flange window, wherein the first photoelectric fusion sensor installation flange window is used to install the photoelectric fusion sensor to be calibrated, and the first defect replacement flange window is used to replace internal defects of the GIS; The test section two is an L-shaped GIS busbar section. The long section of the test section two is provided with a second photoelectric fusion sensor installation flange window, and the second photoelectric fusion sensor installation flange window is used to install the photoelectric fusion sensor. The short section of the test section two is provided with a second defect replacement flange window in the middle.
[0006] Furthermore, the non-partial discharge test transformer comprises a test transformer installed in a sealed metal body, and the non-partial discharge test transformer is grounded at its position.
[0007] Furthermore, five types of typical defects are set inside the GIS of the test section 1 and the test section 2 to verify the performance of the photoelectric fusion sensor, namely metal spike defects, metal particle defects, surface discharge defects, suspended discharge defects and air gap discharge defects.
[0008] Furthermore, the photoelectric fusion sensor can detect a discharge amount of no more than 3pC at the first photoelectric fusion sensor mounting flange window; the photoelectric fusion sensor can detect a discharge amount of no more than 5pC at the second photoelectric fusion sensor mounting flange window.
[0009] Furthermore, two post insulators are installed on the test section 2, and the two post insulators are non-fully enclosed pot-type insulators and do not affect the propagation of optical signals.
[0010] Furthermore, the performance verification device also includes two pulse current measuring units, one of which is installed at the defect position and connected in series with the defect to form a detection unit, and the other pulse current measuring unit is installed at the reference unit and connected in series with the reference unit to form a detection unit.
[0011] Furthermore, the capacitance between the defect and the outer shell forms a capacitance C1, which is grounded via a pulse current detection impedance Z1; the reference unit is a matching capacitance C2 arranged inside the test fixture, which is grounded via a pulse current detection impedance Z2; the pulse current detection impedance Z1 and the pulse current detection impedance Z2 are connected to a pulse current partial discharge instrument; the output signal of the photoelectric fusion sensor is connected to a multi-channel high-speed oscilloscope; the signals collected by the pulse current partial discharge instrument and the multi-channel high-speed oscilloscope are uniformly uploaded to the host computer for further processing.
[0012] A performance verification method for a photoelectric fusion sensor for GIS partial discharge detection comprises the following steps: S1, install the photoelectric fusion sensor at the first photoelectric fusion sensor installation flange window position in the test section 1, so as to verify the effectiveness of the photoelectric fusion sensor in detecting partial discharge occurring near it; S2, replace the flange window in the first defect to test the typical defects of GIS internal equipment in test section 1, and only set one type of defect in each test; S3, gradually increase the voltage of GIS through the test transformer until the pulse current partial discharge instrument detects a discharge of 3pC, and then stop pressurizing; S4, start recording all collected signals through the host computer, and the recording time is 30s; S5, judging whether the photoelectric fusion sensor detects the corresponding partial discharge signal, and the correlation between the characteristic spectrum extracted from the detected signal and the spectrum formed by the pulse current method. If the photoelectric fusion sensor can effectively detect the partial discharge signal and the correlation of the characteristic spectrum exceeds 80%, the photoelectric fusion sensor passes a round of testing; if it fails, the test ends directly; S6, determining whether all five typical defects have been tested, if not, replacing the defect and repeating the above steps; S7, when the photoelectric fusion sensor is installed on the first photoelectric fusion sensor flange window, after all five defects have passed the test, the photoelectric fusion sensor is removed and reinstalled on the second photoelectric fusion sensor flange window to verify the effectiveness of the photoelectric fusion sensor in detecting partial discharge at the far end; S8, repeat the process of steps S2-S6, wherein the defect setting position is changed to the middle position of the short end of the L-type GIS bus section, and the pulse current detection impedance Z1 is also changed to the insulator position close to the defect setting position, and the voltage is increased to a discharge amount of 5pC; S9, conduct validity judgment, if passed, it means that the photoelectric fusion sensor has completely passed the test.
[0013] Furthermore, the method for judging whether the photoelectric fusion sensor has passed the verification test is as follows: the signals collected by the pulse current partial discharge instrument and the multi-channel high-speed oscilloscope are uniformly uploaded to the host computer for further processing; first, the pulse amplitude, pulse phase and number of discharge pulses of the discharge signal detected by the pulse current method and the photoelectric fusion sensor are counted, and then the φ-q and tq spectra of the pulse current method, ultra-high frequency method and optical measurement method are generated respectively, and the correlation between the spectrum measured by the pulse current method and the spectrum measured by the photoelectric fusion sensor is analyzed. When the correlation between the two is higher than 80%, it indicates that the photoelectric fusion sensor has passed the verification test.
[0014] The beneficial effects of the present invention are: The no partial discharge test transformer is installed in a sealed metal body and supplemented with high-pressure insulating gas to ensure that the test transformer will not generate partial discharge during the test and thus interfere with the test; the entire performance verification device is placed in a shielded room to shield external interference noise; as a standard comparison detection method for partial discharge of photoelectric fusion sensors, a pulse current method is used to detect the charge of partial discharge. The traditional parallel detection impedance pulse current detection method is susceptible to interference, the minimum detection discharge is about 5pC, and the detection sensitivity is low. The distributed pulse current detection method is used in this application to improve the sensitivity of discharge detection and realize the detection of extremely low discharge, further verifying the effectiveness and reliability of photoelectric fusion sensor detection.
[0015] This application proposes for the first time a test device for the performance verification of photoelectric fusion sensors, which provides a reliable basis for the field application of photoelectric fusion sensors. It not only verifies the partial discharge near the sensor, but also tests the effectiveness of the remote partial discharge sensor detection. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a schematic diagram of the photoelectric fusion sensor performance verification device of the present invention.
[0017] Figure 2 It is a principle diagram of the partial discharge distributed pulse current method of the present invention.
[0018] Figure 3 It is a schematic diagram of the detection system of the verification device of the present invention.
[0019] Figure 4 It is a calibration flow chart of the photoelectric fusion sensor of the present invention. DETAILED DESCRIPTION
[0020] In order to better understand the present invention, the content of the present invention is further clearly described below in conjunction with the embodiments and the accompanying drawings, but the protection content of the present invention is not limited to the following embodiments. In the following description, a large number of specific details are provided to provide a more thorough understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without one or more of these details.
[0021] like Figure 1-4 As shown, the purpose of this embodiment is to provide a performance verification device for a photoelectric fusion sensor for GIS partial discharge detection, and the performance verification device is placed in a shielded room to shield external interference noise. The performance verification device includes a test voltage generation section, a test section 1 and a test section 2. The performance verification device is grounded at the location of the non-partial discharge test transformer using a single-point grounding method.
[0022] The test voltage generating section includes a non-partial discharge test transformer and a test protection resistor, which are used to generate the voltage required to cause partial discharge at the defect location. The non-partial discharge test transformer is installed in a sealed metal body and supplemented with high-pressure insulating gas to ensure that the test transformer will not generate partial discharge during the test, thereby interfering with the test.
[0023] The test section 1 is a straight GIS busbar section with a first photoelectric fusion sensor installation flange window and a first defect replacement flange window installed, and the section length is 1m. The first photoelectric fusion sensor installation flange window is used to install the photoelectric fusion sensor to be calibrated, and the first defect replacement flange window is used to replace the internal defects of the GIS.
[0024] Five typical defects are set inside the GIS of the test section 1 and the test section 2 to verify the performance of the photoelectric fusion sensor, namely metal spike defect, metal particle defect, surface discharge defect, suspended discharge defect and air gap discharge defect. Test section 1 is used to simulate the detection performance of the photoelectric fusion sensor when local discharge occurs near the photoelectric fusion sensor. Therefore, it is required that in test section 1, the photoelectric fusion sensor should be able to detect a discharge of no more than 3pC.
[0025] The test section 2 is an L-shaped GIS busbar section, with a long section of 4m and a short section of 2m. A second photoelectric fusion sensor installation flange window is opened at the top of the long section of the test section 2, and the second photoelectric fusion sensor installation flange window is used to install the photoelectric fusion sensor. A second defect replacement flange window is opened in the middle of the short section of the test section 2. The straight-line distance between the defect setting position and the photoelectric fusion sensor position is 5m.
[0026] Test section 2 is used to simulate the detection performance of the photoelectric fusion sensor when local discharge occurs far away from the photoelectric fusion sensor; the two insulators are support insulators, not completely enclosed basin insulators, which will not affect the propagation of optical signals. In test section 2, the photoelectric fusion sensor is required to be able to detect a discharge of no more than 5pC.
[0027] As a standard comparative detection method for partial discharge of photoelectric fusion sensors, a pulse current method is used to detect the amount of charge of partial discharge. The traditional parallel detection impedance pulse current detection method is susceptible to interference, and the minimum detection discharge is about 5pC, and the detection sensitivity is low. Therefore, a distributed pulse current detection method is used here. The distributed pulse current measurement method also includes two pulse current measurement units, one of which is installed at the defect position and connected in series with the defect to form a detection unit, and the other pulse current measurement unit is installed at the reference unit and connected in series with the reference unit to form a detection unit. The capacitance between the defect and the outer shell forms a capacitor C1, which is grounded through a pulse current detection impedance Z1. The reference unit is a matching capacitor C2 set inside the test tooling, which is grounded through a pulse current detection impedance Z2. The schematic diagram of the distributed pulse current detection method is shown as follows Figure 2 As shown, C0 is the test fixture capacitance.
[0028] Figure 3 The figure shows the measurement system schematic diagram of the photoelectric fusion sensor calibration device, where the pulse current detection impedance Z1 and the pulse current detection impedance Z2 are connected to the pulse current partial discharge instrument. The output signal of the photoelectric fusion sensor is connected to a multi-channel high-speed oscilloscope; the signals collected by the pulse current partial discharge instrument and the multi-channel high-speed oscilloscope are uniformly uploaded to the host computer for further processing.
[0029] With the power frequency test voltage as a reference, the pulse current partial discharge instrument can calculate the discharge amount, discharge pulse amplitude, discharge phase and other information of the partial discharge. Due to the use of distributed pulse current method, its sensitivity and detection performance are higher than the ultra-high frequency method and optical detection method of the photoelectric fusion sensor. Therefore, the partial discharge pulse detected by the pulse current partial discharge instrument is used as the detection trigger signal of the photoelectric fusion sensor. When the pulse current partial discharge instrument detects partial discharge, the multi-channel high-speed oscilloscope is synchronously triggered to collect the signal of the photoelectric fusion sensor to verify the detection performance of the photoelectric fusion sensor.
[0030] The method for judging whether the photoelectric fusion sensor has passed the verification test is as follows: the signals collected by the pulse current partial discharge instrument and the multi-channel high-speed oscilloscope are uniformly uploaded to the host computer for further processing; first, the pulse amplitude, pulse phase and number of discharge pulses of the discharge signal detected by the pulse current method and the photoelectric fusion sensor are counted; then, the φ-q and tq spectra of the pulse current method, the ultra-high frequency method and the optical measurement method are generated respectively; and the correlation between the spectrum measured by the pulse current method and the spectrum measured by the photoelectric fusion sensor is analyzed; when the correlation between the two is higher than 80%, it indicates that the photoelectric fusion sensor has passed the verification test.
[0031] Figure 4 The performance verification method of the photoelectric fusion sensor for GIS partial discharge detection specifically includes the following steps.
[0032] S1, install the photoelectric fusion sensor at the first photoelectric fusion sensor installation flange window position in the test section 1, so as to verify the effectiveness of the photoelectric fusion sensor in detecting partial discharge occurring near it; S2, replace the flange window in the first defect to test the typical defects of GIS internal equipment in test section 1, and only set one type of defect in each test; S3, gradually increase the voltage of GIS through the test transformer until the pulse current partial discharge instrument detects a discharge of 3pC, and then stop pressurizing; S4, start recording all collected signals through the host computer, and the recording time is 30s; S5, judging whether the photoelectric fusion sensor detects the corresponding partial discharge signal, and the correlation between the characteristic spectrum extracted from the detected signal and the spectrum formed by the pulse current method. If the photoelectric fusion sensor can effectively detect the partial discharge signal and the correlation of the characteristic spectrum exceeds 80%, the photoelectric fusion sensor passes a round of testing; if it fails, the test ends directly; S6, determining whether all five typical defects have been tested, if not, replacing the defect and repeating the above steps; S7, when the photoelectric fusion sensor is installed on the first photoelectric fusion sensor flange window, after all five defects have passed the test, the photoelectric fusion sensor is removed and reinstalled on the second photoelectric fusion sensor flange window to verify the effectiveness of the photoelectric fusion sensor in detecting partial discharge at the far end; S8, repeat the process of steps S2-S6, wherein the defect setting position is changed to the middle position of the short end of the L-type GIS bus section, and the pulse current detection impedance Z1 is also changed to the insulator position close to the defect setting position, and the voltage is increased to a discharge amount of 5pC; S9, conduct validity judgment, if passed, it means that the photoelectric fusion sensor has completely passed the test.
[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the present invention by ordinary technicians in the field should be included in the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.
Claims
1. A performance verification device for a photoelectric fusion sensor for GIS partial discharge detection, the performance verification device is placed in a shielded room, characterized in that: The performance verification device comprises a test voltage generating section, a test section 1 and a test section 2: The test voltage generating section includes a non-partial discharge test transformer and a test protection resistor, which are used to generate the voltage required to cause partial discharge at the defect location; The test section 1 is a straight GIS busbar section equipped with a first photoelectric fusion sensor installation flange window and a first defect replacement flange window, wherein the first photoelectric fusion sensor installation flange window is used to install the photoelectric fusion sensor to be calibrated, and the first defect replacement flange window is used to replace internal defects of the GIS; The test section two is an L-shaped GIS busbar section. The long section of the test section two is provided with a second photoelectric fusion sensor installation flange window, and the second photoelectric fusion sensor installation flange window is used to install the photoelectric fusion sensor. The short section of the test section two is provided with a second defect replacement flange window in the middle.
2. A performance verification device for a photoelectric fusion sensor for GIS partial discharge detection according to claim 1, characterized in that: The non-partial discharge test transformer comprises a test transformer installed in a sealed metal body, and the non-partial discharge test transformer is grounded at its position.
3. A performance verification device for a photoelectric fusion sensor for GIS partial discharge detection according to claim 2, characterized in that: Five types of typical defects are set inside the GIS of the test section 1 and the test section 2 to verify the performance of the photoelectric fusion sensor, namely metal spike defects, metal particle defects, surface discharge defects, suspended discharge defects and air gap discharge defects.
4. A performance verification device for a photoelectric fusion sensor for GIS partial discharge detection according to claim 3, characterized in that: The photoelectric fusion sensor can detect a discharge amount of no more than 3pC at the first photoelectric fusion sensor mounting flange window; the photoelectric fusion sensor can detect a discharge amount of no more than 5pC at the second photoelectric fusion sensor mounting flange window.
5. A performance verification device for a photoelectric fusion sensor for GIS partial discharge detection according to claim 4, characterized in that: Two support insulators are also installed on the test section 2. The two support insulators are non-completely enclosed pot-type insulators and do not affect the propagation of optical signals.
6. A performance verification device for a photoelectric fusion sensor for GIS partial discharge detection according to claim 5, characterized in that: The performance verification device also includes two pulse current measuring units, one of which is installed at the defect position and connected in series with the defect to form a detection unit, and the other pulse current measuring unit is installed at the reference unit and connected in series with the reference unit to form a detection unit.
7. A performance verification device for a photoelectric fusion sensor for GIS partial discharge detection according to claim 6, characterized in that: The capacitance between the defect and the shell forms a capacitor C1, which is grounded via a pulse current detection impedance Z1. The reference unit is a matching capacitor C2 set inside the test fixture, which is grounded via a pulse current detection impedance Z2. The pulse current detection impedance Z1 and the pulse current detection impedance Z2 are connected to a pulse current partial discharge instrument. The output signal of the photoelectric fusion sensor is connected to a multi-channel high-speed oscilloscope; the signals collected by the pulse current partial discharge instrument and the multi-channel high-speed oscilloscope are uniformly uploaded to a host computer for further processing.
8. A performance verification method for a photoelectric fusion sensor for GIS partial discharge detection, comprising the performance verification device according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1, install the photoelectric fusion sensor at the first photoelectric fusion sensor installation flange window position in the test section 1, so as to verify the effectiveness of the photoelectric fusion sensor in detecting partial discharge occurring near it; S2, replace the flange window in the first defect to test the typical defects of GIS internal equipment in test section 1, and only set one type of defect in each test; S3, gradually increase the voltage of GIS through the test transformer until the pulse current partial discharge instrument detects a discharge of 3pC, and then stop pressurizing; S4, start recording all collected signals through the host computer, and the recording time is 30s; S5, judging whether the photoelectric fusion sensor detects the corresponding partial discharge signal, and the correlation between the characteristic spectrum extracted from the detected signal and the spectrum formed by the pulse current method. If the photoelectric fusion sensor can effectively detect the partial discharge signal and the correlation of the characteristic spectrum exceeds 80%, the photoelectric fusion sensor passes a round of testing; if it fails, the test ends directly; S6, determining whether all five typical defects have been tested, if not, replacing the defect and repeating the above steps; S7, when the photoelectric fusion sensor is installed on the first photoelectric fusion sensor flange window, after all five defects have passed the test, the photoelectric fusion sensor is removed and reinstalled on the second photoelectric fusion sensor flange window to verify the effectiveness of the photoelectric fusion sensor in detecting partial discharge at the far end; S8, repeat the process of steps S2-S6, wherein the defect setting position is changed to the middle position of the short end of the L-type GIS bus section, and the pulse current detection impedance Z1 is also changed to the insulator position close to the defect setting position, and the voltage is increased to a discharge amount of 5pC; S9, conduct validity judgment, if passed, it means that the photoelectric fusion sensor has completely passed the test.
9. A performance verification method for a photoelectric fusion sensor for GIS partial discharge detection according to claim 8, characterized in that: The method for judging whether the photoelectric fusion sensor has passed the verification test is as follows: the signals collected by the pulse current partial discharge instrument and the multi-channel high-speed oscilloscope are uniformly uploaded to the host computer for further processing; firstly, the pulse amplitude, pulse phase and number of discharge pulses of the discharge signal detected by the pulse current method and the photoelectric fusion sensor are counted, and then the φ-q and tq spectra of the pulse current method, the ultra-high frequency method and the optical measurement method are generated respectively, and the correlation between the spectrum measured by the pulse current method and the spectrum measured by the photoelectric fusion sensor is analyzed. When the correlation between the two is higher than 80%, it indicates that the photoelectric fusion sensor has passed the verification test.