Cable partial discharge calibration simulation system and method based on programmable control technology

Abstract

The invention belongs to the technical field of calibration simulation, and particularly discloses a cable partial discharge calibration simulation system based on a programmable control technology, and the system comprises a signal parameter setting module which can set standard signal parameters through a signal generator, and covers the frequency, the amplitude, the pulse width and the repetition frequency. The signal coupling transmission module enables the signal generator to generate a signal and couple the signal to a cable. The environment parameter acquisition module is responsible for acquiring environment temperature, humidity, magnetic field intensity and electric field intensity of the signal generator and the cable at each monitoring point. The environmental parameter correction module monitors signal parameters of each monitoring point of the cable in real time according to the collected environmental data and analyzes temperature, humidity, magnetic field and electric field correction indexes. And the signal parameter correction module corrects and analyzes the cable signal parameters accordingly. And the deviation degree abnormity judgment module analyzes the deviation degree index based on the standard and the corrected signal parameter, and judges whether the deviation degree index is abnormal or not for calibration.

Description

Technical Field

[0001] The invention belongs to the technical field of calibration simulation, and relates to a cable partial discharge calibration simulation system and method based on programmable technology. Background Art

[0002] In the power system, cables are important equipment for power transmission and distribution. The stability and reliability of their operating status are crucial to the safety of the entire system. However, cables may produce partial discharge during operation due to various reasons, which will not only accelerate the aging of cable insulation and reduce its service life, but may also cause serious power accidents. Therefore, it is particularly important to accurately measure and calibrate the partial discharge of cables.

[0003] For example, the Chinese invention with publication number CN112363028B discloses a cable for partial discharge simulation and a calibration method for a partial discharge measurement system of a high-voltage cable, wherein the cable for partial discharge simulation includes two copper wires formed by a plurality of inductors connected in series, and a capacitor is connected in parallel before each inductor at a symmetrical position on the two copper wires. The cable is a cable for partial discharge simulation based on concentrated parameter electronic components. The actual cable is simulated by concentrated parameter components, and a small integrated module is realized to replace the actual cable that occupies a large amount of space. When simulating partial discharge at a long distance, the advantage is more obvious. In addition, the cable for partial discharge simulation of this structure can avoid the problems of discrete performance of parameters such as partial discharge amount, poor repeatability and stability, cumulative effect of partial discharge defects, unstable signals, etc. in the process of partial discharge simulation based on the physical defects of the actual cable. The cable for partial discharge simulation of this structure has a real simulation effect, accurate data, good repeatability, good simulation effect, and convenient implementation.

[0004] The above-mentioned prior art has the following problems: 1. The prior art focuses on using concentrated parameter electronic components to simulate partial discharge cables, and focuses on solving problems related to the structure and simulation effect of the actual cable simulation, such as discrete and unstable parameter performance and unstable signals. However, it does not take into account the influence of various environmental factors of the cable on the signal parameters in actual operation, and does not correct the signal parameters based on various environmental factors. This leads to the fact that under different actual environmental conditions, the prior art is difficult to ensure that the signal parameters can always be close to the ideal standard value, and cannot effectively deal with the interference of environmental changes to signal transmission, which limits its ability to ensure the quality and reliability of data transmission in complex and changing environments.

[0005] 2. The existing technology mainly revolves around the structural design of cables for partial discharge simulation and the simulation of relevant characteristics of actual cables through concentrated parameter electronic components. The focus is on solving problems such as parameter performance and simulation effect that arise when simulating actual cables. However, it does not involve the deviation of accurate quantified signals. It is difficult to accurately know how much the signal deviates from the standard state during the transmission process, and the ability to accurately control signal transmission is insufficient. Summary of the invention

[0006] In view of this, in order to solve the problems raised in the above background technology, a cable partial discharge calibration simulation system and method based on programmable technology is proposed.

[0007] The purpose of the present invention can be achieved through the following technical solutions: The present invention provides a cable partial discharge calibration simulation system based on programmable technology, including: a signal parameter setting module: used to set various standard signal parameters through a signal generator, including the standard frequency, standard amplitude, standard pulse width and standard pulse repetition frequency of the signal.

[0008] Signal coupling and transmission module: used to generate a signal through a signal generator and couple the generated signal to the cable.

[0009] Environmental parameter acquisition module: used to collect the temperature, humidity, magnetic field strength and electric field strength of the environment where the signal generator and cable are located at each set monitoring point.

[0010] Environmental parameter correction module: used to monitor the signal parameters of the cable at each set monitoring point in real time, and analyze the temperature correction index Tem of each signal parameter of the cable at each set monitoring point based on the temperature, humidity, magnetic field strength and electric field strength of the environment where the signal generator and the cable are located at each set monitoring point j , Humidity Correction Index j , Magnetic field strength correction index mag j and the electric field strength correction index ele j , where j represents the number corresponding to the j-th monitoring point, j=1,2,3,...J.

[0011] Signal parameter correction module: used to correct the signal parameters of the cable at each set monitoring point based on the temperature correction index, humidity correction index, magnetic field strength correction index and electric field strength correction index of the cable at each set monitoring point, and analyze the signal parameters of the cable at each set monitoring point after the environmental parameters are corrected.

[0012] Deviation degree abnormality judgment module: It is used to analyze the deviation degree index of each signal parameter of the cable at each set monitoring point based on each standard signal parameter set by the signal generator and the signal parameters of the cable corrected by the environmental parameters, and then determine whether the deviation degree of each signal parameter of the cable is abnormal, and then perform calibration.

[0013] In a second aspect, the present invention provides a cable partial discharge calibration simulation method based on programmable technology, the method comprising: S1, signal parameter setting: setting various standard signal parameters through a signal generator, including the standard frequency, standard amplitude, standard pulse width and standard pulse repetition frequency of the signal.

[0014] S2. Signal coupling transmission: Generate a signal through a signal generator, and couple the generated signal to the cable.

[0015] S3. Environmental parameter collection: Collect the temperature, humidity, magnetic field strength and electric field strength of the environment where the signal generator and the cable are located at each set monitoring point.

[0016] S4. Environmental parameter correction: Real-time monitoring of the signal parameters of the cable at each set monitoring point. Based on the temperature, humidity, magnetic field strength and electric field strength of the environment in which the signal generator and the cable are located at each set monitoring point, the temperature correction index, humidity correction index, magnetic field strength correction index and electric field strength correction index of the signal parameters of the cable at each set monitoring point are analyzed.

[0017] S5. Signal parameter correction: Correct the signal parameters of the cable at each set monitoring point based on the temperature correction index, humidity correction index, magnetic field strength correction index and electric field strength correction index of the cable at each set monitoring point, and analyze the signal parameters of the cable at each set monitoring point after the environmental parameter correction.

[0018] S6. Determination of abnormal deviation degree: Based on the signal parameters of the cable at each set monitoring point after correction of the standard signal parameters and environmental parameters set by the signal generator, analyze the deviation degree index of each signal parameter of the cable, and then determine whether the deviation degree of each signal parameter of the cable is abnormal, and then perform calibration.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) The present invention monitors the signal parameters of the cable at each set monitoring point in real time, and analyzes the temperature correction index, humidity correction index, magnetic field strength correction index and electric field strength correction index of the cable at each set monitoring point based on the temperature, humidity, magnetic field strength and electric field strength of the environment in which the signal generator and the cable are located at each set monitoring point. This can effectively overcome the interference of environmental factors on signal transmission, enable the signal to maintain a high degree of accuracy and stability during the transmission process, reduce the possibility of signal distortion, attenuation or distortion, and ensure the reliability of information transmission.

[0020] (2) The present invention corrects the signal parameters of the cable at each set monitoring point based on the temperature correction index, humidity correction index, magnetic field strength correction index and electric field strength correction index of the cable at each set monitoring point, and analyzes the signal parameters of the cable at each set monitoring point after the environmental parameter correction. This ensures that under different environmental conditions, the signal parameters are as close to the ideal standard value as possible, reduces signal distortion and error, improves the fidelity of signal transmission, and enables the receiving end to more accurately restore the original signal information, which can greatly improve the quality and reliability of data transmission.

[0021] (3) The present invention uses the signal parameters of the cable set by the signal generator and the signal parameters of the cable corrected by the environmental parameters at the set monitoring points to analyze the deviation index of the signal parameters of the cable, and then determine whether the deviation of the signal parameters of the cable is abnormal, and then perform calibration. It can accurately quantify the deviation of the signal. Calibration based on this can effectively correct the signal deviation caused by various factors and restore the signal to the ideal standard state as much as possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0023] Figure 1 It is a schematic diagram of the connection of each module of the system of the present invention.

[0024] Figure 2 The figure is a schematic diagram of the steps of real-time monitoring of signal parameters of a cable at a set monitoring point according to the present invention.

[0025] Figure 3 Schematic diagram of the steps of the method of the present invention. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] See also Figure 1As shown, the present invention provides a cable partial discharge calibration simulation system based on programmable technology, including: a signal parameter setting module, a signal coupling transmission module, an environmental parameter acquisition module, an environmental parameter correction module, a signal parameter correction module, and a deviation degree abnormality judgment module.

[0028] The signal coupling and transmission module is respectively connected to the signal parameter setting module and the environmental parameter acquisition module, the environmental parameter acquisition module is respectively connected to the signal coupling and transmission module and the environmental parameter correction module, the environmental parameter correction module is respectively connected to the environmental parameter acquisition module and the signal parameter correction module, and the signal parameter correction module is respectively connected to the environmental parameter correction module and the deviation degree abnormality determination module.

[0029] Signal parameter setting module: used to set various standard signal parameters through the signal generator, including the standard frequency, standard amplitude, standard pulse width and standard pulse repetition frequency of the signal.

[0030] Signal coupling and transmission module: used to generate a signal through a signal generator and couple the generated signal to the cable.

[0031] Environmental parameter acquisition module: used to collect the temperature, humidity, magnetic field strength and electric field strength of the environment where the signal generator and cable are located at each set monitoring point.

[0032] The present invention can understand the environmental conditions of the signal generator in real time by collecting the temperature, humidity, magnetic field strength and electric field strength of the environment where the signal generator and the cable are located at each set monitoring point.

[0033] Environmental parameter correction module: used to monitor the signal parameters of the cable at each set monitoring point in real time, and analyze the temperature correction index Tem of each signal parameter of the cable at each set monitoring point based on the temperature, humidity, magnetic field strength and electric field strength of the environment where the signal generator and the cable are located at each set monitoring point j , Humidity Correction Index j , Magnetic field strength correction index mag j and the electric field strength correction index ele j , where j represents the number corresponding to the j-th monitoring point, j=1,2,3,...J.

[0034] See also Figure 2 As shown, the specific process of real-time monitoring of the signal parameters of the cable at each set monitoring point is as follows: A1, the frequency of the signal of the cable at each monitoring point is obtained by a spectrum analyzer, and recorded as fre j .

[0035] As a preferred embodiment, the frequency of the signal of the cable at each monitoring point refers to the number of times the frequency of the signal of the cable at each monitoring point changes periodically within a unit time.

[0036] For any periodic phenomenon, such as sine waves, cosine waves and other signals, it indicates the number of complete cycles the signal completes in one second. For example, a sine wave signal completes 10 complete cycles in 1 second, then the frequency of this signal is 10Hz (Hertz).

[0037] A2. Obtain the waveform of the cable signal at each monitoring point through an oscilloscope, and obtain the amplitude of the cable signal at each monitoring point through the height of the waveform of the cable signal at each monitoring point, which is recorded as amp j .

[0038] A3. By measuring the time difference between the starting point and the ending point of the pulse in the waveform of the cable signal at each monitoring point, the pulse width of the cable signal at each monitoring point is obtained and recorded as pulse j .

[0039] A4. Calculate the pulse period by the time difference between two adjacent pulses in the waveform of the signal of the cable at each monitoring point. Calculate the pulse repetition frequency of the signal of the cable at each monitoring point based on the relationship between frequency and period, and record it as repeat j .

[0040] The pulse repetition frequency of the signal of the cable at each monitoring point is specifically: the number of times the pulse signal of the cable at each monitoring point repetitively appears per unit time.

[0041] For example, if a pulse radar platform transmits 100 pulse signals per second, the pulse repetition frequency of the radar signal is 100Hz. It describes the periodicity of the pulse sequence, and the reciprocal of the time interval between two adjacent pulses is the pulse repetition frequency.

[0042] Furthermore, the specific process of analyzing the temperature correction index of each signal parameter of the cable at each set monitoring point is: analyzing the temperature correction index Tem of the frequency of the signal of the cable at each set monitoring point j , Where Xwen represents the temperature of the environment where the signal generator is located, Dwen j Indicates the temperature of the environment where the cable is located at the set jth monitoring point, △T j It indicates the allowable temperature deviation value of the cable affected by the temperature at the set jth monitoring point. Where α represents the temperature difference influence factor under the influence of temperature, and Bfre represents the standard frequency of the signal.

[0043] As a preferred embodiment, the specific setting process of α is: in a laboratory environment, other environmental factors (such as humidity, magnetic field strength, electric field strength) and standard signal parameters of the signal generator need to be kept unchanged, and only the temperature variable is changed. The cable is placed in different temperature environments, and for each temperature value, the actual frequency of the signal transmitted by the cable at this temperature is measured, and the temperature and standard frequency of the environment where the signal generator is located are recorded at the same time.

[0044] Through data fitting methods (such as the least squares method), the relationship formula between frequency and temperature is determined based on the frequency data at different temperatures measured experimentally. The experimental data is substituted into the relationship formula between frequency and temperature to calculate a series of temperature difference influence factor values. The calculated temperature difference influence factor values ​​are then averaged to obtain the temperature difference influence factor under the influence of temperature.

[0045] Based on the temperature correction index of the frequency of the cable at each set monitoring point, the temperature correction index of the amplitude, pulse width and pulse repetition frequency of the signal of the cable at each set monitoring point is similarly obtained.

[0046] Furthermore, the specific process of analyzing the humidity correction index of each signal parameter of the cable at each set monitoring point is as follows: The specific process of analyzing the humidity correction index of each signal parameter of the cable at each set monitoring point is as follows: Analyzing the humidity correction index Humid of the amplitude of the signal of the cable at each set monitoring point j , Where Bamp represents the standard amplitude of the signal, β represents the humidity difference factor under the influence of humidity, Xhum represents the humidity of the environment where the signal generator is located, and Dhum j Indicates the humidity of the environment where the cable is located at the set jth monitoring point.

[0047] The setting process of β is similar to that of α.

[0048] Based on the analysis method of the humidity correction index of the amplitude of the cable signal at each set monitoring point, the humidity correction index of the frequency, pulse width and pulse repetition frequency of the cable signal at each set monitoring point is obtained similarly.

[0049] The specific process of analyzing the magnetic field strength correction index of each signal parameter of the cable at each set monitoring point is as follows: further, analyzing the magnetic field strength correction index mag of the pulse width of the signal of the cable at each set monitoring point j , Where Bpulse represents the standard pulse width of the signal, χ represents the influence factor of the magnetic field strength difference under the influence of the magnetic field strength, Xmag represents the magnetic field strength of the environment where the signal generator is located, and Dmag j It indicates the magnetic field strength of the environment where the cable is located at the set j-th monitoring point.

[0050] As a preferred embodiment, the χ*Bpulse*(Dmag j -Xmag) represents the theoretical change of pulse width under the influence of the change of magnetic field strength at the jth monitoring point of the cable.

[0051] The setting process of χ is similar to that of α.

[0052] Based on the analysis method of the magnetic field strength correction index of the pulse width of the cable signal at each set monitoring point, the magnetic field strength correction index of the frequency, amplitude and pulse repetition frequency of the cable signal at each set monitoring point is obtained similarly.

[0053] Furthermore, the specific process of analyzing the electric field strength correction index of each signal parameter of the cable at each set monitoring point is: analyzing the electric field strength correction index of the pulse repetition frequency of the signal of the cable at each set monitoring point j , Where Brepeat represents the standard pulse repetition frequency of the signal, δ represents the influence factor of the electric field strength difference under the influence of the electric field strength, Xele represents the electric field strength of the environment where the signal generator is located, and Dele j It represents the electric field strength of the environment where the cable is located at the set jth monitoring point.

[0054] As a preferred embodiment, the Brepeat*δ*(Dele j -Xele) represents the theoretical change of the pulse repetition frequency under the influence of the change of the electric field strength at the set jth monitoring point of the cable.

[0055] The setting process of δ is similar to that of α.

[0056] Based on the analysis method of the electric field strength correction index of the pulse repetition frequency of the cable signal at each set monitoring point, the electric field strength correction index of the frequency, amplitude and pulse width of the cable signal at each set monitoring point is obtained similarly.

[0057] The present invention monitors the signal parameters of the cable at each set monitoring point in real time, and analyzes the temperature correction index, humidity correction index, magnetic field strength correction index and electric field strength correction index of the cable at each set monitoring point based on the temperature, humidity, magnetic field strength and electric field strength of the environment in which the signal generator and the cable are located at each set monitoring point. The present invention can effectively overcome the interference of environmental factors on signal transmission, maintain a high degree of accuracy and stability of the signal during the transmission process, reduce the possibility of signal distortion, attenuation or distortion, and ensure the reliability of information transmission.

[0058] Signal parameter correction module: used to correct the signal parameters of the cable at each set monitoring point based on the temperature correction index, humidity correction index, magnetic field strength correction index and electric field strength correction index of the cable at each set monitoring point, and analyze the signal parameters of the cable at each set monitoring point after the environmental parameters are corrected.

[0059] Furthermore, the specific process of analyzing the signal parameters of the cable at each set monitoring point after the environmental parameter correction is as follows: analyzing the frequency Xfre of the signal of the cable at each set monitoring point after the environmental parameter correction j , Wherein χ1, χ2, χ3 and χ4 represent the weights corresponding to the temperature correction index, humidity correction index, magnetic field strength correction index and electric field strength correction index of the cable at the set monitoring point, respectively, and χ1+χ2+χ3+χ4=1.

[0060] As a preferred embodiment, the x1, x2, x3 and x4 can be set to 0.4, 0.2, 0.2 and 0.2 respectively. The influence of temperature on cable signal transmission is usually more significant. The electrical properties of many materials (such as resistivity, etc.) will change with the change of temperature, which directly affects the transmission characteristics of the signal; humidity mainly affects signal transmission by affecting the electrical properties such as the dielectric constant of the insulating material. High humidity may reduce the insulation performance of the cable, resulting in signal leakage, etc., but this influence is generally smaller than the influence range of temperature. In most cases, the change of humidity on the signal frequency is relatively indirect and slow; the influence of the magnetic field on the cable signal frequency depends on whether the cable is a type that is susceptible to magnetic field interference (such as a poorly shielded cable). In actual environments, the change in magnetic field strength is generally relatively small, and not all cables are subject to strong magnetic field interference. Only when close to a strong magnetic field source (such as a large motor, transformer, etc.), the interference of the magnetic field on the cable signal will be more obvious; similar to the magnetic field strength, the influence of the electric field on the cable signal frequency also requires specific conditions. In general, changes in the surrounding electric field strength will not affect the cable signal frequency as universally as temperature changes. The influence of the electric field on the cable signal will be more significant only when there is a strong electric field interference source (such as near a high-voltage transmission line). Therefore, the weight corresponding to the temperature correction index of the cable at the set monitoring point is greater than the weights corresponding to the humidity correction index, the magnetic field strength correction index and the electric field strength correction index.

[0061] According to the analysis method of the frequency of the signal of the cable at each set monitoring point after the environmental parameters are corrected, the amplitude, pulse width and pulse repetition frequency of the signal of the cable at each set monitoring point after the environmental parameters are corrected are obtained in the same way, which are recorded as Xamp j 、Xpulse j and Xrepeat j .

[0062] The present invention corrects each signal parameter of the cable at each set monitoring point based on the temperature correction index, humidity correction index, magnetic field strength correction index and electric field strength correction index of the cable at each set monitoring point, and analyzes each signal parameter of the cable at each set monitoring point after the environmental parameter correction, so as to ensure that under different environmental conditions, each signal parameter is as close to the ideal standard value as possible, reduce signal distortion and error, improve the fidelity of signal transmission, enable the receiving end to restore the original signal information more accurately, and greatly improve the quality and reliability of data transmission.

[0063] Deviation degree abnormality judgment module: It is used to analyze the deviation degree index of each signal parameter of the cable at each set monitoring point based on each standard signal parameter set by the signal generator and the signal parameters of the cable corrected by the environmental parameters, and then determine whether the deviation degree of each signal parameter of the cable is abnormal, and then perform calibration.

[0064] Furthermore, the specific process of determining whether the deviation degree of each signal parameter of the cable is abnormal is: analyzing the deviation degree index Pfre of the frequency of the cable signal, Where J represents the total number of monitoring points and e represents a natural constant.

[0065] According to the analysis method of the frequency deviation index of the cable signal, the deviation index of the amplitude, pulse width and pulse repetition frequency of the cable signal is obtained in the same way, which are recorded as Pamp, Ppulse and Prepeat respectively.

[0066] The deviation degree index of each signal parameter of the cable is compared with the preset deviation degree index threshold. If the deviation degree index of a signal parameter of the cable is greater than the preset deviation degree index threshold, the deviation degree of the signal parameter of the cable is abnormal, and then the signal parameters of the cable with abnormal deviation degree are obtained.

[0067] Furthermore, the specific process of the calibration is: if a signal parameter with abnormal deviation degree of the cable is frequency, the output frequency of the signal generator is adjusted until the frequency of the cable at each set monitoring point reaches the frequency of the monitoring point corresponding to the cable after the environmental parameters are corrected.

[0068] Similarly, according to the analysis method in which a certain signal parameter of the abnormal cable deviation degree is frequency, the case in which a certain signal parameter of the abnormal cable deviation degree is amplitude, pulse width and pulse repetition frequency is calibrated.

[0069] The present invention uses various standard signal parameters set by a signal generator and various signal parameters of the cable at set monitoring points after environmental parameter correction to analyze the deviation degree index of various signal parameters of the cable, and then judge whether the deviation degree of various signal parameters of the cable is abnormal, and then calibrate, which can accurately quantify the deviation of the signal. Calibration based on this can effectively correct the signal deviation caused by various factors and restore the signal to an ideal standard state as much as possible.

[0070] Please refer to Figure 3 As shown, the second aspect of the present invention provides a cable partial discharge calibration simulation method based on programmable technology, the method comprising: S1, signal parameter setting: setting various standard signal parameters through a signal generator, including the standard frequency, standard amplitude, standard pulse width and standard pulse repetition frequency of the signal.

[0071] S2. Signal coupling transmission: Generate a signal through a signal generator, and couple the generated signal to the cable.

[0072] S3. Environmental parameter collection: Collect the temperature, humidity, magnetic field strength and electric field strength of the environment where the signal generator and the cable are located at each set monitoring point.

[0073] S4. Environmental parameter correction: Real-time monitoring of the signal parameters of the cable at each set monitoring point. Based on the temperature, humidity, magnetic field strength and electric field strength of the environment in which the signal generator and the cable are located at each set monitoring point, the temperature correction index, humidity correction index, magnetic field strength correction index and electric field strength correction index of the signal parameters of the cable at each set monitoring point are analyzed.

[0074] S5. Signal parameter correction: Correct the signal parameters of the cable at each set monitoring point based on the temperature correction index, humidity correction index, magnetic field strength correction index and electric field strength correction index of the cable at each set monitoring point, and analyze the signal parameters of the cable at each set monitoring point after the environmental parameter correction.

[0075] S6. Determination of abnormal deviation degree: Based on the signal parameters of the cable at each set monitoring point after correction of the standard signal parameters and environmental parameters set by the signal generator, analyze the deviation degree index of each signal parameter of the cable, and then determine whether the deviation degree of each signal parameter of the cable is abnormal, and then perform calibration.

[0076] The above contents are merely examples and explanations of the concept of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined by the present invention, they shall all fall within the protection scope of the present invention.

Claims

1. A cable partial discharge calibration simulation system based on programmable technology, characterized by: include: Signal parameter setting module: used to set various standard signal parameters through the signal generator, including the standard frequency, standard amplitude, standard pulse width and standard pulse repetition frequency of the signal; Signal coupling and transmission module: used to generate a signal through a signal generator and couple and transmit the generated signal to the cable; Environmental parameter acquisition module: used to collect the temperature, humidity, magnetic field strength and electric field strength of the environment where the signal generator and the cable are located at each set monitoring point; Environmental parameter correction module: used to monitor the signal parameters of the cable at each set monitoring point in real time, and analyze the temperature correction index Tem of each signal parameter of the cable at each set monitoring point based on the temperature, humidity, magnetic field strength and electric field strength of the environment where the signal generator and the cable are located at each set monitoring point j , Humidity Correction Index j , Magnetic field strength correction index mag j and the electric field strength correction index ele j , where j represents the number corresponding to the jth monitoring point, j = 1, 2, 3, ... J; Signal parameter correction module: used to correct the signal parameters of the cable at each set monitoring point based on the temperature correction index, humidity correction index, magnetic field strength correction index and electric field strength correction index of the cable at each set monitoring point, and analyze the signal parameters of the cable at each set monitoring point after the environmental parameter correction; Deviation degree abnormality judgment module: used to analyze the deviation degree index of each signal parameter of the cable based on each signal parameter of the cable at each set monitoring point and each signal parameter of the cable at each set monitoring point after correction of environmental parameters, and then determine whether the deviation degree of each signal parameter of the cable is abnormal, and then perform calibration.

2. The cable partial discharge calibration simulation system based on programmable technology according to claim 1, characterized in that: The specific process of real-time monitoring of the signal parameters of the cable at each set monitoring point is as follows: A1. Obtain the frequency of the signal at each monitoring point through the spectrum analyzer and record it as fre j ; A2. Obtain the waveform of the cable signal at each monitoring point through an oscilloscope, and obtain the amplitude of the cable signal at each monitoring point through the height of the waveform of the cable signal at each monitoring point, which is recorded as amp j ; A3. By measuring the time difference between the starting point and the ending point of the pulse in the waveform of the cable signal at each monitoring point, the pulse width of the cable signal at each monitoring point is obtained and recorded as pulse j ; A4. Calculate the pulse period by the time difference between two adjacent pulses in the waveform of the signal of the cable at each monitoring point. Calculate the pulse repetition frequency of the signal of the cable at each monitoring point based on the relationship between frequency and period, and record it as repeat j .

3. The cable partial discharge calibration simulation system based on programmable technology according to claim 2, characterized in that: The specific process of analyzing the temperature correction index of each signal parameter of the cable at each set monitoring point is as follows: Analyze the temperature correction index Tem of the signal frequency of the cable at each set monitoring point j , Where Xwen represents the temperature of the environment where the signal generator is located, Dwen j Indicates the temperature of the environment where the cable is located at the set jth monitoring point, △T j It indicates the allowable temperature deviation value of the cable affected by the temperature at the set jth monitoring point. Where α represents the temperature difference influence factor under the influence of temperature, and Bfre represents the standard frequency of the signal; Based on the temperature correction index of the frequency of the cable at each set monitoring point, the temperature correction index of the amplitude, pulse width and pulse repetition frequency of the signal of the cable at each set monitoring point is similarly obtained.

4. The cable partial discharge calibration simulation system based on programmable technology according to claim 2, characterized in that: The specific process of analyzing the humidity correction index of each signal parameter of the cable at each set monitoring point is as follows: Analyze the humidity correction index Humid of the signal amplitude of the cable at each set monitoring point j , Where Bamp represents the standard amplitude of the signal, β represents the humidity difference factor under the influence of humidity, Xhum represents the humidity of the environment where the signal generator is located, and Dhum j Indicates the humidity of the environment where the cable is located at the set jth monitoring point; Based on the analysis method of the humidity correction index of the amplitude of the cable signal at each set monitoring point, the humidity correction index of the frequency, pulse width and pulse repetition frequency of the cable signal at each set monitoring point is obtained similarly.

5. The cable partial discharge calibration simulation system based on programmable technology according to claim 2, characterized in that: The specific process of analyzing the magnetic field strength correction index of each signal parameter of the cable at each set monitoring point is as follows: Analyze the magnetic field strength correction index mag of the pulse width of the cable signal at each set monitoring point j , Where Bpulse represents the standard pulse width of the signal, χ represents the influence factor of the magnetic field strength difference under the influence of the magnetic field strength, Xmag represents the magnetic field strength of the environment where the signal generator is located, and Dmag j It represents the magnetic field strength of the environment where the cable is located at the set jth monitoring point; Based on the analysis method of the magnetic field strength correction index of the pulse width of the cable signal at each set monitoring point, the magnetic field strength correction index of the frequency, amplitude and pulse repetition frequency of the cable signal at each set monitoring point is obtained similarly.

6. The cable partial discharge calibration simulation system based on programmable technology according to claim 2, characterized in that: The specific process of analyzing the electric field strength correction index of each signal parameter of the cable at each set monitoring point is as follows: Analyze the electric field strength correction index ele of the pulse repetition frequency of the signal of the cable at each set monitoring point j , Where Brepeat represents the standard pulse repetition frequency of the signal, δ represents the influence factor of the electric field strength difference under the influence of the electric field strength, Xele represents the electric field strength of the environment where the signal generator is located, and Dele j It represents the electric field strength of the environment where the cable is located at the set jth monitoring point; Based on the analysis method of the electric field strength correction index of the pulse repetition frequency of the cable signal at each set monitoring point, the electric field strength correction index of the frequency, amplitude and pulse width of the cable signal at each set monitoring point is obtained similarly.

7. The cable partial discharge calibration simulation system based on programmable technology according to claim 1, characterized in that: The specific process of analyzing the signal parameters of the cable at each set monitoring point after the environmental parameter correction is as follows: Analyze the frequency Xfre of the cable signal at each set monitoring point after the environmental parameter correction j , Wherein χ1, χ2, χ3 and χ4 represent the weights corresponding to the temperature correction index, humidity correction index, magnetic field strength correction index and electric field strength correction index of the cable at the set monitoring point, respectively, and χ1+χ2+χ3+χ4=1; According to the analysis method of the frequency of the signal of the cable at each set monitoring point after the environmental parameters are corrected, the amplitude, pulse width and pulse repetition frequency of the signal of the cable at each set monitoring point after the environmental parameters are corrected are obtained in the same way, which are recorded as Xamp j 、Xpulse j and Xrepeat j .

8. The cable partial discharge calibration simulation system based on programmable technology according to claim 7, characterized in that: The specific process of determining whether the deviation degree of each signal parameter of the cable is abnormal is as follows: Analyze the frequency deviation index Pfre of the cable signal. Where J represents the total number of monitoring points, and e represents a natural constant; According to the analysis method of the frequency deviation index of the cable signal, the deviation index of the amplitude, pulse width and pulse repetition frequency of the cable signal is obtained in the same way, which are recorded as Pamp, Ppulse and Prepeat respectively; The deviation degree index of each signal parameter of the cable is compared with the preset deviation degree index threshold. If the deviation degree index of a signal parameter of the cable is greater than the preset deviation degree index threshold, the deviation degree of the signal parameter of the cable is abnormal, and then the signal parameters of the cable with abnormal deviation degree are obtained.

9. The cable partial discharge calibration simulation system based on programmable control technology according to claim 8, characterized in that: The specific process of calibration is as follows: If a signal parameter of the cable with abnormal deviation is frequency, the output frequency of the signal generator is adjusted until the frequency of the cable at each set monitoring point reaches the frequency of the monitoring point corresponding to the cable after the environmental parameter correction; Similarly, according to the analysis method in which a certain signal parameter of the abnormal cable deviation degree is frequency, the case in which a certain signal parameter of the abnormal cable deviation degree is amplitude, pulse width and pulse repetition frequency is calibrated.

10. The cable partial discharge calibration simulation method based on programmable technology according to claim 1, characterized in that: The method includes: S1. Signal parameter setting: setting various standard signal parameters through the signal generator, including the standard frequency, standard amplitude, standard pulse width and standard pulse repetition frequency of the signal; S2, signal coupling transmission: Generate a signal through a signal generator, and couple the generated signal to the cable; S3, environmental parameter collection: collect the temperature, humidity, magnetic field strength and electric field strength of the environment where the signal generator and the cable are located at each set monitoring point; S4, environmental parameter correction: real-time monitoring of the signal parameters of the cable at each set monitoring point, based on the temperature, humidity, magnetic field strength and electric field strength of the environment where the signal generator and the cable are located at each set monitoring point, analyzing the temperature correction index, humidity correction index, magnetic field strength correction index and electric field strength correction index of the signal parameters of the cable at each set monitoring point; S5, signal parameter correction: correcting the signal parameters of the cable at each set monitoring point based on the temperature correction index, humidity correction index, magnetic field strength correction index and electric field strength correction index of the cable at each set monitoring point, and analyzing the signal parameters of the cable at each set monitoring point after the environmental parameter correction; S6. Determination of abnormal deviation degree: Based on the signal parameters of the cable at each set monitoring point after correction of the standard signal parameters and environmental parameters set by the signal generator, analyze the deviation degree index of each signal parameter of the cable, and then determine whether the deviation degree of each signal parameter of the cable is abnormal, and then perform calibration.

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