High dv / dt pulse voltage partial discharge detection system based on fluorescent optical fiber
Through the sensing system based on fluorescent fiber, the problem of insufficient local discharge detection accuracy and anti-interference ability of traditional detection methods under high dv/dt pulse voltage is solved, and the detection effect of high resolution and high signal-to-noise ratio is achieved.
Patent Information
- Application Number
- CN202510187860.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-20
- Publication Date
- 2025-04-04
AI Technical Summary
Traditional partial discharge detection methods are difficult to achieve accurate detection in high DV/DT pulse voltage scenarios, mainly due to electromagnetic interference and signal-to-noise ratio problems.
Using a sensing system based on fluorescent fiber, high-resolution detection of local discharge under high dv/dt pulse voltage is achieved through fiber optic probes, photoelectric conversion devices, oscilloscopes and data acquisition cards. The system converts the optical signal generated by the discharge into an electrical signal through the fluorescence principle, and processes it through a high-responsive photoelectric conversion device and a high-bandwidth oscilloscope.
High resolution detection of local discharge in high-dv/dt pulse voltage scenarios is realized, which avoids electromagnetic interference, improves signal-to-noise ratio, and ensures the accuracy and stability of detection.
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Figure CN119757994A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of partial discharge detection, in particular to a high dv / dt pulse voltage partial discharge detection system based on fluorescent optical fiber. Background Art
[0002] As an effective carrier for improving power density, the new generation of high-voltage power semiconductor devices has been widely used in power conversion, transportation electrification, aerospace and other fields. Thanks to the excellent switching characteristics of wide-bandgap semiconductors such as SiC, power equipment is gradually developing towards high-frequency, high dv / dt voltage working environments. However, under high-voltage, high-frequency, and high-dv / dt repetitive pulse voltages, the insulation system of electrical equipment will be subjected to more severe voltage stress, which will be aggravated by the voltage reflection phenomenon in the drive system. High dv / dt pulse voltage may increase the reflected wave and cause voltage overshoot, which can be up to twice the voltage amplitude in severe cases. Therefore, it is urgent to carry out an assessment and analysis of the insulation risks in electrical equipment under high dv / dt pulse voltages.
[0003] Partial discharge (PD) is an early sign of insulation degradation. Accurate monitoring of discharge is of great significance for ensuring the safe operation of equipment. At present, the traditional detection methods for partial discharge under conventional high voltage mainly include high frequency current method (HFCT), ultrasonic method and pulse current method. The HFCT signal bandwidth can be adjusted at any time according to the actual situation, and its sensor is easy to install and carry; however, when detecting partial discharge under pulse voltage, the signal-to-noise ratio of HFCT detection of partial discharge is easily affected by electromagnetic interference, especially when the frequency of the pulse voltage is greater than 10kHz, the noise signal detected by HFCT is much larger than the detected PD signal, resulting in HFCT failure. In comparison, although ultrasonic detection technology uses the principle of ultrasound to sense the occurrence of partial discharge and isolates the transmission and connection of electrical signals to a certain extent, ultrasound is easily interfered by mechanical vibration within the detection range, and there is a problem of signal attenuation. In addition, under high dv / dt pulse voltage, its detection probe and conditioning unit are susceptible to strong electrical interference. The pulse current method has high test sensitivity, and the measurement results are intuitive, effective and easy to judge; however, its anti-electromagnetic interference ability is poor, and an ideal test environment is required. Therefore, the traditional partial discharge detection methods based on electrical and ultrasonic principles are difficult to meet the test requirements in high dv / dt pulse voltage scenarios.
[0004] Research shows that the discharge electromagnetic signal under high dv / dt voltage has a broadband characteristic, distributed in the range of hundreds of MHz to several GHz, which is difficult to detect and has high requirements for hardware sampling. Conventional detection methods are difficult to achieve accurate detection. At the same time, switching electromagnetic interference under high dv / dt pulse voltage is also a major problem restricting discharge detection. In view of the above problems, it is also difficult to accurately collect discharge signals under high dv / dt voltage only through traditional ultra-high frequency (UHF) and photomultiplier tube (PMT) for local discharge. Therefore, it is necessary to propose a new type of targeted sensing system to solve the problem of severe switching electromagnetic interference and poor detection accuracy of traditional electrical sensors. Summary of the invention
[0005] In response to the above problems and technical needs, the inventors have proposed a high dv / dt pulse voltage partial discharge detection system based on fluorescent optical fiber, which uses fluorescent optical fiber sensing technology to achieve high-resolution detection of partial discharge in high pulse voltage scenarios.
[0006] The technical solution for implementing the present invention is as follows:
[0007] A high dv / dt pulse voltage partial discharge detection system based on fluorescent optical fiber comprises an optical fiber probe, a photoelectric conversion device, an oscilloscope and a data acquisition card; the optical fiber probe is formed by coating a specific fluorescent agent on the outside and winding, the optical fiber probe is used as a sensor, and the front end of the optical fiber probe generates fluorescence with a longer wavelength based on the fluorescence principle when receiving a light signal generated by discharge, and propagates in the pigtail at the rear end of the probe; the other end of the pigtail of the optical fiber probe is connected to the photoelectric conversion device, and the output discharge light is placed opposite to the avalanche diode array inside the photoelectric conversion device for converting the discharge signal; the optical fiber probe and the photoelectric conversion device constitute a fluorescent optical fiber sensing system, which converts the light signal generated by the discharge into an electrical signal for output; the photoelectric conversion device is connected to the oscilloscope through a signal transmission line, and the discharge data of the sensing system under the high dv / dt pulse voltage scenario is stored through the data acquisition card.
[0008] Furthermore, the optical fiber probe sensor is arranged in the chamber of the discharge source device in a spiral winding manner; according to the different detection material objects, coating materials with different wavelengths are selected for discharge signal detection; by establishing a local discharge light source platform corresponding to a specific discharge spectrum model under a sinusoidal voltage, the sensor arrangement distance D, the number of winding turns N and the optical fiber length L are optimized, the sensor output capacity is optimized and the best detection effect is achieved.
[0009] Furthermore, the photoelectric conversion device has an output response speed of ns level, a photoelectric conversion time of ns level, an output pulse response speed of ns level, a bandwidth of more than 300 MHz, and an output oscillation of less than 1 mV.
[0010] Furthermore, the acquisition bandwidth of the oscilloscope and the acquisition card is at the GHz level, ensuring the accuracy of data acquisition; the connection part between the optical fiber probe and the photoelectric conversion device needs to be connected through a focusing unit and collect optical signals to ensure the sensor acquisition sensitivity.
[0011] Furthermore, the spiral winding mode of the optical fiber probe is Archimedean spiral winding, and the winding parameters include optical fiber length L, number of winding turns N, and distance D from the discharge source; the optical signal contact ratio of the wound optical fiber probe is above 90%, ensuring the accuracy of the collected signal.
[0012] Furthermore, during the process of optical fiber absorbing, transmitting, and converting electro-optical signals, the wavelength ranges of each stage correspond in real time to ensure that the original optical signal is stably converted into an electrical output signal.
[0013] Furthermore, the local discharge light source platform includes a sinusoidal high-voltage voltage source, a discharge test model, a discharge test cavity, a reference electrical sensor, and an oscilloscope; the discharge test model is used as a discharge optical signal source for sensor optimization; the sinusoidal high-voltage voltage source is connected to the high-voltage side of the discharge test model, and the other side of the discharge test model is connected to the test cavity and grounded; the reference electrical sensor is coupled to the ground wire and connected to the oscilloscope through a transmission line; the discharge light output test is performed by selecting different winding parameters of the optical fiber probe and comparing it with the reference electrical sensor, and the comparison indicators selected include the output sensitivity, resolution, and signal-to-noise ratio of the fluorescent optical fiber sensing system; based on the comparison indicators, the optimal arrangement of the fluorescent optical fiber probe is determined.
[0014] Furthermore, the sensitivity of the fluorescent fiber optic sensor system is determined by the partial discharge inception voltage. The sensitivity parameters under the optimal arrangement are determined by comparing the minimum partial discharge inception voltage under different arrangements. The resolution of the fluorescent fiber optic sensor system is the minimum time width of a single pulse detected by the sensor, including the output response time and the recovery time. The shorter the pulse width time, the higher the resolution. The noise mean power spectrum P of the sensor output signal at the time of no discharge is obtained. noise The signal power spectrum P under discharge conditions signal Calculate the signal-to-noise ratio SNR, the calculation method includes:
[0015]
[0016] Furthermore, the minimum time width of the output pulse of the fluorescent optical fiber sensing system is determined by the half-maximum full width, and the half-maximum full width is the time from 50% rising edge to 50% falling edge of a pulse waveform.
[0017] Furthermore, the minimum time width of the output pulse of the fluorescent optical fiber sensing system is in the ns level, and the smaller the half-maximum full width value is, the higher the resolution of the sensing system is.
[0018] Compared with the prior art, the beneficial technical effects of the present invention are:
[0019] (1) The high dv / dt pulse voltage partial discharge detection system based on fluorescent optical fiber provided by the present invention uses fluorescent optical fiber sensing technology to achieve high-resolution detection of partial discharge in high dv / dt pulse voltage scenarios, and achieves electrical isolation from the main circuit during the detection process, avoiding electromagnetic interference problems caused by pulse voltage switches and not causing any impact on the equipment itself that is operating the electrical system to be detected;
[0020] (2) The high dv / dt pulse voltage partial discharge detection system based on fluorescent optical fiber provided by the present invention has a wide detection range and a high signal-to-noise ratio of the signal output. The discharge signal can still be accurately detected when the pulse voltage frequency is high and the rise time is short.
[0021] (3) The present invention provides a method for optimizing and calculating the sensor probe in view of the characteristics of high dv / dt pulse voltage scenarios, thereby realizing high-resolution and oscillation-free acquisition of local discharge signals under high dv / dt pulse voltages and improving the accuracy of insulation risk assessment under high dv / dt pulse voltages. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 It is a schematic diagram of the fluorescent optical fiber sensing system of the present invention and the reference electrical sensor for acquiring partial discharge signals.
[0023] Figure 2 It is a design principle diagram of fluorescent optical fiber partial discharge detection of the present invention.
[0024] Figure 3 The present invention is a flowchart of a method for partial discharge detection.
[0025] Figure 4 4 is a simulation diagram of the effect of pattern distance on the output of the optical fiber probe in an embodiment of the present invention.
[0026] Figure 5 It is a simulation diagram of the effect of the number of winding turns on the output of the optical fiber probe in an embodiment of the present invention.
[0027] Figure 6 It is a simulation diagram of the effect of optical fiber length on the output of the optical fiber probe in an embodiment of the present invention.
[0028] Figure 7 It is a diagram of partial discharge calibration results at different output amplitudes of the sensor under sinusoidal voltage obtained in an embodiment of the present invention.
[0029] Figure 8 It is a verification diagram of the multi-cycle output capability of the sensor under sinusoidal voltage in an embodiment of the present invention.
[0030] Fig. 9 3 is a comparison diagram of partial discharge inception voltages of discharge signals at different frequencies in an embodiment of the present invention.
[0031] Fig.10 3 is a graph comparing the signal-to-noise ratios of discharge signals at different frequencies in an embodiment of the present invention.
[0032] Fig.11 3 is a diagram comparing the resolution parameters of discharge signals at different frequencies in an embodiment of the present invention.
[0033] Fig.12 3 is a schematic diagram comparing the same discharge pulse collected by different sensors in a high dv / dt pulse voltage scenario in an embodiment of the present invention.
[0034] Fig.13 This is a graph of test results of a reference electrical sensor at r=1000ns in an embodiment of the present invention.
[0035] Fig.14 This is a graph of the test results of a reference electrical sensor at r=200ns in an embodiment of the present invention.
[0036] Fig.15 This is a graph showing the fluorescent optical fiber test results at r = 1000ns in an embodiment of the present invention.
[0037] Fig.16 This is the fluorescent optical fiber output result when r=50ns in the embodiment of the present invention. DETAILED DESCRIPTION
[0038] The present invention is described below based on embodiments in conjunction with the accompanying drawings of the specification, but the present invention is not limited to these embodiments. In the following detailed description of the present invention, some specific details are described in detail. For those skilled in the art, the present invention can be fully understood without the description of these details.
[0039] like Figure 1 As shown, the present invention discloses a high dv / dt pulse voltage partial discharge detection system based on fluorescent optical fiber, comprising an optical fiber probe (1), a photoelectric conversion device (2), an oscilloscope (3), and a data acquisition card (4); the optical fiber probe (1) is coated with a specific fluorescent agent on the outside and wound, the other end of the optical fiber probe (1) is connected to the photoelectric conversion device (2), and the output discharge light is placed opposite to the avalanche diode array inside the photoelectric conversion device (2) for converting the discharge signal; the optical fiber probe (1) and the photoelectric conversion device (2) constitute a fluorescent optical fiber sensing system, which converts the light signal generated by the discharge into an electrical signal for output; the photoelectric conversion device (2) is connected to the oscilloscope (3) via a signal transmission line, and the discharge data of the sensing system in the high dv / dt pulse voltage scenario is stored via the data acquisition card (4).
[0040] Furthermore, the optical fiber probe (1) sensor is arranged in a chamber of a discharge source device in a spirally coiled manner; coating materials of different wavelengths are selected for discharge signal detection according to different detection material objects; by establishing a local discharge light source platform corresponding to a specific discharge spectrum model under a sinusoidal voltage, the sensor arrangement distance D, the number of windings N and the optical fiber length L are optimized, thereby optimizing the sensor output capacity and achieving the best detection effect.
[0041] Furthermore, the photoelectric conversion device (2) has an output response speed of ns level, a photoelectric conversion time of ns level, an output pulse response speed of ns level, a bandwidth of more than 300 MHz, and an output oscillation of less than 1 mV.
[0042] Furthermore, the acquisition bandwidth of the oscilloscope (3) and the acquisition card (4) is at the GHz level, ensuring the accuracy of data acquisition; the connection part between the optical fiber probe (1) and the photoelectric conversion device (2) needs to be connected through a focusing unit and collect optical signals, ensuring the sensor acquisition sensitivity.
[0043] Furthermore, the spiral winding mode of the optical fiber probe (1) is Archimedean spiral winding, and the winding parameters include the optical fiber length L, the number of winding turns N, and the distance D from the discharge source; the optical signal contact ratio of the wound optical fiber probe (1) is above 90%, thereby ensuring the accuracy of the collected signal.
[0044] Furthermore, during the process of optical fiber absorbing, transmitting, and converting electro-optical signals, the wavelength ranges of each stage correspond in real time to ensure that the original optical signal is stably converted into an electrical output signal.
[0045] Furthermore, the local discharge light source platform comprises a sinusoidal high voltage voltage source (5), a discharge test model (6), a discharge test cavity (7), a reference electrical sensor (8), and an oscilloscope (3); the discharge test model (6) is used as a discharge optical signal source for sensor optimization; the sinusoidal high voltage voltage source (5) is connected to the high voltage side of the discharge test model (6), and the other side of the discharge test model (6) is connected to the test cavity (7) and grounded; the reference electrical sensor (8) is coupled to the ground wire and connected to the oscilloscope (3) via a transmission line; a discharge light output test is performed by selecting different winding parameters of the optical fiber probe (1), and comparing it with the reference electrical sensor, and the comparison indicators selected include the output sensitivity, resolution, and signal-to-noise ratio of the fluorescent optical fiber sensor system; and the arrangement of the optimal fluorescent optical fiber probe (1) is determined based on the comparison indicators.
[0046] Furthermore, the sensitivity of the fluorescent fiber optic sensor system is determined by the partial discharge inception voltage. The sensitivity parameters under the optimal arrangement are determined by comparing the minimum partial discharge inception voltage under different arrangements. The resolution of the fluorescent fiber optic sensor system is the minimum time width of a single pulse detected by the sensor, including the output response time and the recovery time. The shorter the pulse width time, the higher the resolution. The noise mean power spectrum P of the sensor output signal at the time of no discharge is obtained. noise The signal power spectrum P under discharge conditions signal Calculate the signal-to-noise ratio SNR, the calculation method includes:
[0047]
[0048] Furthermore, the minimum time width of the output pulse of the fluorescent optical fiber sensing system is determined by the half-maximum full width, and the half-maximum full width is the time from 50% rising edge to 50% falling edge of a pulse waveform.
[0049] Furthermore, the minimum time width of the output pulse of the fluorescent optical fiber sensing system is in the ns level, and the smaller the half-maximum full width value is, the higher the resolution of the sensing system is.
[0050] The method for partial discharge detection using the present invention comprises the following steps:
[0051] Step S1, using a fluorescent optical fiber sensor to collect the sensor output signal at the partial discharge area of the electrical system to be detected. For specific settings, refer to Figure 1 .
[0052] The electrical system to be tested has a partial discharge phenomenon in the partial discharge area under the scenario of high dv / dt pulse voltage. The high dv / dt pulse voltage indicates a pulse voltage whose voltage change rate exceeds a predetermined threshold. The high dv / dt pulse voltage is different from the general power frequency voltage, which generally has a high frequency characteristic.
[0053] Place fluorescent fiber optic sensors at places where discharge may occur, and place the sensors around the discharge source in a spiral winding manner. If the discharge source is surrounded by a medium that is easy to transmit light, such as air, the distance between the optical fiber and the discharge source should not exceed 0.5m. If it is a medium that is difficult to transmit light, the distance should not exceed 0.02m. According to the test results, considering the detection sensitivity and the volume of the probe, the number of winding turns should be 3-5 turns.
[0054] Step S2, connect the pigtail to the photoelectric conversion device, and the photoelectric conversion device is powered by 30.6V DC. The optical fiber probe detects the light signal and converts it into fluorescence with a longer wavelength. The other end of the optical fiber probe is connected to the photoelectric conversion device, and the output discharge light is placed opposite to the avalanche diode array inside the photoelectric conversion device to convert the discharge light signal into an electrical signal.
[0055] Step S3, data acquisition and signal processing. After collecting the discharge data, extract the discharge signal of the fluorescent fiber sensor in multiple cycles, use amplitude filtering, wavelet noise reduction and other means to filter out interference signals, obtain the discharge time and amplitude information in multiple cycles, and perform fitting calibration processing to test the multi-cycle output and continuous detection capability of the sensor. Figure 7 , 8 .in Figure 7 The partial discharge calibration results of the sensor at different output amplitudes are shown in Figure 2. Figure 8 This is the verification of the multi-cycle output capability of the sensor under sinusoidal voltage. It can be seen that there is a strong linear relationship between the output of the fluorescent fiber optic sensor and the calibration source, and it has continuous output capability.
[0056] The detection system was used to perform discharge detection. The results showed that there was a local discharge signal under a high dv / dt pulse voltage waveform in the region, where r was the rise time of the high dv / dt pulse voltage. By comparing the local discharge starting voltage, signal and noise average power, and output discharge pulse width parameters of the fluorescent fiber optic sensor and the reference electrical sensor under the same conditions, the sensitivity, signal-to-noise ratio, and resolution parameters of the fluorescent fiber optic sensor for detecting discharge signals were verified. In one example, the reference Fig. 9 , 10 , 11 give the comparison results of local discharge inception voltage, signal-to-noise ratio and resolution parameters of discharge signals at different frequencies. Fig. 9 The sensitivity comparison results are Fig.10 The signal-to-noise ratio comparison results are Fig.11 The results of the resolution test are shown in Figure 2. It can be seen that the fluorescent fiber sensor has high detection sensitivity, resolution and signal-to-noise ratio. By comparing the sensor detection waveforms under different rise time r voltages, the anti-electromagnetic interference performance of the fluorescent fiber is verified. In one example, Fig.12 The test results of different sensors detecting the same discharge pulse under high dv / dt voltage are given. Fig.13 , 14 , 15, and 16 give the discharge pulse detection results under different rise times r. Fig.13 is the reference electrical sensor test result at r = 1000ns, Fig.14 The reference electrical sensor test result at r = 200ns, Fig.15 The test results of fluorescent optical fiber at r = 1000ns are as follows: Fig.16 The output result of the fluorescent fiber at r = 50ns. It can be seen that the traditional electrical sensor has noise aliasing when the voltage rise time is r = 200ns, while the fluorescent fiber can still effectively detect the discharge signal when the rise time is r = 50ns, and realizes output non-oscillation collection, with the best anti-interference ability.
[0057] The above is only a preferred embodiment of the present application, and the present invention is not limited to the above embodiments. It is understood that other improvements and changes directly derived or associated by those skilled in the art without departing from the spirit and concept of the present invention should be considered to be included in the protection scope of the present invention.
Claims
1. A high dv / dt pulse voltage partial discharge detection system based on fluorescent optical fiber, characterized in that: The optical fiber probe (1) comprises an optical fiber probe (1), a photoelectric conversion device (2), an oscilloscope (3), and a data acquisition card (4); the optical fiber probe (1) is coated with a specific fluorescent agent on the outside and wound, the optical fiber probe (1) is used as a sensor, and the front end of the optical fiber probe (1) generates fluorescence with a longer wavelength based on the fluorescence principle when receiving a light signal generated by discharge, and propagates in the tail fiber at the rear end of the probe; the other end of the tail fiber of the optical fiber probe (1) is connected to the photoelectric conversion device (2), and the output discharge light is placed opposite to the avalanche diode array inside the photoelectric conversion device (2) for converting the discharge signal; the optical fiber probe (1) and the photoelectric conversion device (2) constitute a fluorescent optical fiber sensing system, which converts the light signal generated by discharge into an electrical signal for output; the photoelectric conversion device (2) is connected to the oscilloscope (3) via a signal transmission line, and the discharge data of the fluorescent optical fiber sensing system under a high dv / dt pulse voltage scenario is stored via the data acquisition card (4).
2. The high dv / dt pulse voltage partial discharge detection system based on fluorescent optical fiber according to claim 1 is characterized in that: The optical fiber probe (1) is arranged in a chamber of a discharge source device in a spiral winding manner; coating materials with different wavelengths are selected for discharge signal detection according to different detection material objects; a local discharge light source platform corresponding to a specific discharge spectrum model under a sinusoidal voltage is established, the sensor arrangement distance D, the number of windings N and the optical fiber length L are optimized, the sensor output capacity is optimized and the best detection effect is achieved.
3. The high dv / dt pulse voltage partial discharge detection system based on fluorescent optical fiber according to claim 1 is characterized in that: The photoelectric conversion device (2) has an output response speed of ns level, a photoelectric conversion time of ns level, an output pulse response speed of ns level, a bandwidth of more than 300 MHz, and an output oscillation of less than 1 mV.
4. The high dv / dt pulse voltage partial discharge detection system based on fluorescent optical fiber according to claim 1 is characterized in that: The acquisition bandwidth of the oscilloscope (3) and the acquisition card (4) is at the GHz level, ensuring the accuracy of data acquisition; the connection part between the optical fiber probe (1) and the photoelectric conversion device (2) needs to be connected through a focusing unit and collect optical signals, ensuring the acquisition sensitivity of the sensor.
5. The high dv / dt pulse voltage partial discharge detection system based on fluorescent optical fiber according to claim 2 is characterized in that: The spiral winding method of the optical fiber probe (1) is Archimedean spiral winding, and the winding parameters include optical fiber length L, number of winding turns N, and distance D from the discharge source; the optical signal contact ratio of the wound optical fiber probe (1) is above 90%, ensuring the accuracy of the collected signal.
6. The high dv / dt pulse voltage partial discharge detection system based on fluorescent optical fiber according to claim 2, characterized in that: During the process of receiving, transmitting and converting the electro-optical signal by the optical fiber probe (1), the wavelength ranges of each stage correspond in real time, thereby ensuring that the original optical signal is stably converted into the electrical output signal.
7. The high dv / dt pulse voltage partial discharge detection system based on fluorescent optical fiber according to claim 2 is characterized in that: The local discharge light source platform comprises a sinusoidal high voltage voltage source (5), a discharge test model (6), a discharge test cavity (7), a reference electrical sensor (8), and an oscilloscope (3); the discharge test model (6) is used as a discharge optical signal source for sensor optimization; the sinusoidal high voltage voltage source (5) is connected to the high voltage side of the discharge test model (6), and the other side of the discharge test model (6) is connected to the test cavity (7) and grounded; the reference electrical sensor (8) is coupled to the ground wire and connected to the oscilloscope (3) via a transmission line; a discharge light output test is performed by selecting different winding parameters of the optical fiber probe (1), and comparing it with the reference electrical sensor, and the comparison indicators selected include the output sensitivity, resolution, and signal-to-noise ratio of the fluorescent optical fiber sensor system; and the arrangement of the optimal fluorescent optical fiber probe (1) is determined based on the comparison indicators.
8. The high dv / dt pulse voltage partial discharge detection system based on fluorescent optical fiber according to claim 1, characterized in that: The sensitivity of the fluorescent fiber optic sensor system is determined by the partial discharge inception voltage. The sensitivity parameters under the optimal arrangement are determined by comparing the minimum partial discharge inception voltage under different arrangements. The resolution of the fluorescent fiber optic sensor system is the minimum time width of a single pulse detected by the sensor, including the output response time and the recovery time. The shorter the pulse width time, the higher the resolution. The noise mean power spectrum P of the sensor output signal at the time of no discharge is obtained. noise The signal power spectrum P under discharge conditions signal Calculate the signal-to-noise ratio SNR, the calculation method includes:
9. The high dv / dt pulse voltage partial discharge detection system based on fluorescent optical fiber according to claim 8, characterized in that: The minimum time width of the output pulse of the fluorescent optical fiber sensor system is determined by the half-maximum full width, and the half-maximum full width is the time from 50% rising edge to 50% falling edge of a pulse waveform.
10. The high dv / dt pulse voltage partial discharge detection system based on fluorescent optical fiber according to claim 9, characterized in that: The minimum time width of the output pulse of the fluorescent optical fiber sensing system is in the ns level, and the smaller the half-maximum full width value is, the higher the resolution of the fluorescent optical fiber sensing system is.