CN107861033B - Calibration method and system for positioning error of oscillation wave partial discharge detection system - Google Patents
Calibration method and system for positioning error of oscillation wave partial discharge detection system Download PDFInfo
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Abstract
The invention relates to a method and a system for calibrating a positioning error of an oscillatory wave partial discharge detection system, wherein the method comprises the following steps: receiving a test signal of an error test, generating a double-pulse signal meeting a set condition according to the test signal, acquiring double-pulse interval time of the double-pulse signal, acquiring a standard positioning value corresponding to the double-pulse signal according to the double-pulse interval time and a preset tested cable length, inputting the double-pulse signal into a tested oscillation wave partial discharge detection system, acquiring a measured positioning value of the tested oscillation wave partial discharge detection system for the double-pulse signal, and acquiring a positioning error of the tested oscillation wave partial discharge detection system according to the standard positioning value and the measured positioning value. According to the scheme, the fault point of the cable is simulated through the double-pulse signal, and the calibration of the positioning error of the oscillation wave partial discharge detection system under the uncharged condition is facilitated.
Description
Technical Field
The invention relates to the technical field of partial discharge detection, in particular to a method for calibrating a positioning error of an oscillatory wave partial discharge detection system and a system for calibrating the positioning error of the oscillatory wave partial discharge detection system.
Background
With the rapid development of national economy, power grid accidents caused by cables are more and more emphasized, and the safety and stability of cable operation are the current hot subjects. The crosslinked polyethylene cable gradually replaces oiled paper and insulating oil cables due to the advantages of good stability, convenience in laying, convenience in installation and the like. However, due to the limitation of materials and processes, it is difficult to avoid the occurrence of partial discharge caused by the penetration of the cable body and accessories into the defect during the production and laying process, and the partial discharge may cause further deterioration of the main insulation defect, even breakdown and other failures. The method for measuring the damped oscillatory wave by the partial discharge is taken as an effective means for measuring the partial discharge of the cable introduced in China in recent years, the work of measuring the partial discharge of the cable by the oscillatory wave is developed in China, the standard of relevant equipment and a test method of the oscillatory wave is promulgated by the national energy agency in 2016, and the standard parameters of an oscillatory wave partial discharge detection system are given. The standard mentions that the positioning error of the oscillatory wave detection system must be below 1% of the cable length or not above 3.4 meters. Under the standard, no detection system for detecting the partial discharge of the oscillation wave can meet the requirement.
Disclosure of Invention
Based on the method, a method and a system for calibrating the positioning error of the oscillatory wave partial discharge detection system are provided for solving the problem that whether the oscillatory wave partial discharge detection system meets the standard or not is not calibrated at present.
A method for calibrating a positioning error of an oscillatory wave partial discharge detection system, the method comprising:
receiving a test signal of an error test, and controlling a preset waveform generator to generate a double-pulse signal meeting a set condition according to the test signal;
acquiring the double-pulse interval time of the double-pulse signal, and obtaining a standard positioning value corresponding to the double-pulse signal according to the double-pulse interval time and the preset length of the tested cable;
inputting the double-pulse signal into a detected oscillation wave partial discharge detection system to obtain a measurement positioning value of the detected oscillation wave partial discharge detection system for the double-pulse signal;
and obtaining the positioning error of the detected oscillation wave partial discharge detection system according to the standard positioning value and the measurement positioning value.
An oscillatory wave partial discharge detection system positioning error verification system, the system comprising:
the standard signal generating module is used for receiving a test signal of an error test and controlling a preset waveform generator to generate a double-pulse signal meeting a set condition according to the test signal;
the standard value generating module is used for acquiring the double-pulse interval time of the double-pulse signal and obtaining a standard positioning value corresponding to the double-pulse signal according to the double-pulse interval time and the preset length of the tested cable;
the measurement module is used for inputting the double-pulse signal into a detected oscillation wave partial discharge detection system and acquiring a measurement positioning value of the detected oscillation wave partial discharge detection system for the double-pulse signal;
and the error verification module is used for obtaining the positioning error of the detected oscillation wave partial discharge detection system according to the standard positioning value and the measurement positioning value.
A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the above-mentioned method.
A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the method when executing the program.
According to the calibration method and the calibration system for the positioning error of the oscillatory wave partial discharge detection system, the test signal of the error test is received, the dipulse signal meeting the set condition is generated according to the test signal, the dipulse interval time of the dipulse signal is obtained, and the standard positioning value corresponding to the dipulse signal is obtained according to the dipulse interval time and the preset length of the tested cable; inputting the double-pulse signal into a detected oscillation wave partial discharge detection system to obtain a measurement positioning value of the detected oscillation wave partial discharge detection system for the double-pulse signal; and obtaining the positioning error of the detected oscillation wave partial discharge detection system according to the standard positioning value and the measurement positioning value. According to the scheme, the fault point of the cable is simulated through the double-pulse signal, and the calibration of the positioning error of the oscillation wave partial discharge detection system under the condition of no electricity is facilitated.
Drawings
FIG. 1 is a schematic flow chart diagram of a method for calibrating a positioning error of an oscillatory wave partial discharge detection system in one embodiment;
FIG. 2 is a diagram illustrating a double pulse signal according to an embodiment;
FIG. 3 is a schematic block diagram of an exemplary verification system for detecting positioning errors of an oscillatory wave partial discharge detection system.
Detailed Description
In order to further explain the technical means and effects of the present invention, the following description will be made for clear and complete descriptions of the technical solutions of the embodiments of the present invention with reference to the accompanying drawings and preferred embodiments.
Fig. 1 is a schematic flow chart of a method for calibrating a positioning error of an oscillatory wave partial discharge detection system in an embodiment, as shown in fig. 1, the method includes the steps of:
s101, receiving a test signal of an error test, and controlling a preset waveform generator to generate a double-pulse signal meeting a set condition according to the test signal.
In this step, before the test is performed, basic information of the test needs to be determined, where the test may be triggered by the test basic information in the form of a test signal. And generating a double-pulse signal meeting a preset condition according to the test signal.
S102, obtaining the double-pulse interval time of the double-pulse signal, and obtaining a standard positioning value corresponding to the double-pulse signal according to the double-pulse interval time and the preset length of the tested cable.
As shown in fig. 2, the double pulse signal is a pulse signal having double peaks, and in this step, the double pulse interval time is a time interval Δ t between two peaks, and by setting the double pulse interval time, a fault point in a cable of a preset length can be simulated, and a specific position of the fault point can be calculated.
S103, inputting the double-pulse signal into a detected oscillation wave partial discharge detection system, and acquiring a measurement positioning value of the detected oscillation wave partial discharge detection system for the double-pulse signal.
In this step, the detected oscillatory wave partial discharge detection system may be any one of the oscillation wave partial discharge detection systems based on the damped oscillatory wave method on the market, and similarly, a fault point is simulated by a double-pulse signal, and a measurement positioning value can be obtained by measuring with the oscillation wave partial discharge detection system.
And S104, obtaining the positioning error of the detected oscillation wave partial discharge detection system according to the standard positioning value and the measurement positioning value.
In the embodiment, the method comprises the steps of receiving a test signal of an error test, generating a dipulse signal meeting a set condition according to the test signal, obtaining dipulse interval time of the dipulse signal, and obtaining a standard positioning value corresponding to the dipulse signal according to the dipulse interval time and a preset length of a tested cable; inputting the double-pulse signal into a detected oscillation wave partial discharge detection system to obtain a measurement positioning value of the detected oscillation wave partial discharge detection system for the double-pulse signal; and obtaining the positioning error of the detected oscillation wave partial discharge detection system according to the standard positioning value and the measurement positioning value. According to the scheme, the fault point of the cable is simulated through the double-pulse signal, and the calibration of the positioning error of the oscillation wave partial discharge detection system under the condition of no electricity is facilitated.
For the step of S101, in an embodiment, a double pulse signal satisfying a set condition may be generated according to the test signal by: analyzing the test signal to obtain parameter information of the double-pulse signal; the parameter information comprises pulse width information, rising edge time information, double-pulse interval time information and amplitude information of the double-pulse signal; and generating a double-pulse signal according to the parameter information, wherein the pulse width, the rising edge time, the double-pulse time interval and the amplitude of the front pulse and the back pulse of the generated double-pulse signal follow a mathematical model of the apparent discharge amount.
Since the test signal includes the setting of the parameters of the dipulse signal in the test, after the parameter information carried in the test signal is obtained through analysis, the corresponding pulse signal can be obtained according to the parameter information, and it can be known that a plurality of different dipulse signals may be used in one test, and therefore, the parameter information may include the setting information of a plurality of dipulse signals. The double-pulse signal generated by the method can achieve higher precision and improve the accuracy of error detection.
Optionally, after the double-pulse signal is generated, it is further determined whether the double-pulse signal meets a set condition, specifically, it is determined whether the double-pulse signal meets the set condition by: inputting a dipulse signal generated according to a test signal into an oscilloscope, and measuring the dipulse signal with a parameter value approximately equal to the parameter information, wherein whether the dipulse signal is approximately equal can be judged by setting a threshold, for example, when judging whether the dipulse interval time of the dipulse signal meets the requirement, if the dipulse interval time of the dipulse signal generated according to the parameter information and the apparent discharge amount model is 8 mus, the threshold is set to +/-0.1 mus, and the dipulse interval time of the dipulse signal generated by detecting through the oscilloscope is 7.95 mus, the parameter of the dipulse interval time is judged to meet the approximately equal condition, and when all the parameters are approximately equal, the dipulse signal is judged to meet the set condition.
For the step of S102, optionally, the interval time of the double pulse signal may be acquired by: obtaining the double-pulse interval time of the double-pulse signal according to the parameter information; or inputting the double-pulse signal into an oscilloscope, and acquiring the double-pulse interval time of the double-pulse signal through the oscilloscope. When the test is carried out, the double-pulse interval time can be obtained by directly using the parameter information, and the double-pulse interval time can be obtained by measuring a double-pulse signal by using an oscilloscope. One of the two methods may be selected, or the two methods may be simultaneously adopted, and the average value thereof is calculated and taken as the double pulse interval time of the double pulse signal.
The double-pulse interval time of the double-pulse signal is accurately obtained through the embodiment, so that the fault point is simulated more accurately, and the standard positioning value of the standard positioning point is obtained through calculation.
In another embodiment, the standard positioning value can be obtained according to the interval time and the preset length of the measured cable by the following method: the mathematical expression of obtaining the standard positioning value according to the double-pulse interval time and the length of the tested cable is as follows:
wherein x issRepresenting a standard orientation value; l represents the length of the tested cable; v. of0Representing the wave speed of a preset double-pulse signal; Δ tsRepresenting the double pulse interval time; k represents a preset positive integer.
In the present embodiment, a relation between the dipulse interval time and the standard positioning value is given, that is, in the case where the dipulse signal wave velocity and the measured cable length are determined, the dipulse interval time and the standard positioning value have a one-to-one correspondence relationship. In the above formula, k is preferably 2.
For the step S103, in an optional embodiment, the dual-pulse signal is input into a detected oscillation wave partial discharge detection system, and the following manner may be adopted to obtain a measured positioning value of the detected oscillation wave partial discharge detection system for the dual-pulse signal: inputting the double-pulse signal into a detected oscillation wave partial discharge detection system; and successively adjusting the amplitude of each double-pulse signal to different amplitudes, reading the measurement positioning value of the measured oscillation wave partial discharge detection system aiming at the double-pulse signal under each amplitude, and averaging to obtain the measurement positioning value of the double-pulse signal.
Optionally, 5 different amplitude values are set, for example: and 1V, 2V, 3V, 4V and 5V, reading the measurement positioning values of the partial discharge detection system aiming at the double-pulse signals under the 5 amplitude values, and averaging to obtain the measurement positioning values of the double-pulse signals.
Furthermore, for the same detected oscillation wave partial discharge detection system, a plurality of groups of double pulse signals can be input, for example: the setting method of the equal difference sequence may be adopted for setting the double pulse time of the 5 double pulse signals, for example, the preset cable lengths corresponding to the 5 double pulse signals are set to be different in a manner that the double pulse interval time of the five double pulse signals is respectively set to be 8 μ s, 10 μ s, 12 μ s, 14 μ s and 16 μ s, and may be respectively set to be 500m, 800m, 1100m, 1400m and 1700 m. 5 different dipulse signals are set and each dipulse signal sets 5 different amplitude magnitudes, for example: 1V, 2V, 3V, 4V and 5V. The above-mentioned multiunit experimental data that sets up, its purpose is in order to guarantee the accuracy of testing on different distances, consequently, can also set up multiunit experiment through other modes, and it is not repeated here.
For the step of S104, in an embodiment, the positioning error of the detected oscillation wave partial discharge detection system can be obtained by: the mathematical expression of the positioning error is as follows:
wherein E islIndicating a positioning error, xmIndicating the measured position value.
Optionally, inputting 5 standard positioning values corresponding to the 5 groups of double-pulse signals and 5 measured positioning values obtained by using the 5 double-pulse signals into a mathematical expression of the positioning error correspondingly, and calculating to obtain 5 positioning errors; and acquiring the maximum value of the 5 positioning errors as the positioning error of the detected oscillation wave partial discharge detection system.
In this embodiment, 5 sets of measured positioning values obtained by corresponding measurement in the previous embodiment, and standard positioning values obtained by calculating the double-pulse signals corresponding to the measured positioning values are input into the mathematical expression for calculating the positioning error, so as to obtain 5 positioning errors. The maximum value of the 5 positioning errors is used as the positioning error of the detected oscillation wave partial discharge detection system, and in addition, how many groups of data can be obtained according to the test requirements, and the method is not limited to 5 groups.
The technical solution of the present invention is further illustrated by a specific example.
5 groups of test data are set, and each group of test data is shown in table 1:
TABLE 1
Wherein, Δ t1And l1Corresponding to a set, Δ t2And l2Corresponding to a set, Δ t3And l3Corresponding to a set, Δ t4And l3Corresponding to a set, Δ t5And l5For one set, the wave velocity was set at 170m/μ s.
According to the formula
Calculating the standard positioning value x corresponding to each pulse interval times1、xs2、xs3、xs4And xs5. Inputting the 5 double-pulse signals into a cable with corresponding length, adjusting the amplitude of each group of double-pulse signals to be 1V, 2V, 3V, 4V and 5V respectively, and obtaining the average value of 5 measurement positioning values measured by the oscillatory wave partial discharge detection system to be x respectivelym1、xm2、xm3、xm4And xm5Inputting the standard position, the measured positioning value and the corresponding cable length into a formula
The calculation results are shown in table 2:
TABLE 2
The interval time is measured by an oscilloscope and a measuring system respectively, and the positioning error E is obtained by the table 2lThe maximum value of 0.357 percent is selected as the positioning error of the detected oscillation wave partial discharge detection system.
Based on the same idea as the calibration method for the positioning error of the oscillatory wave partial discharge detection system in the above embodiment, the present invention further provides a calibration system for the positioning error of the oscillatory wave partial discharge detection system, which can be used to execute the calibration method for the positioning error of the oscillatory wave partial discharge detection system. For convenience of illustration, the schematic structural diagram of the embodiment of the verification system for detecting the positioning error of the system for partial discharge of oscillating waves only shows a part related to the embodiment of the present invention, and those skilled in the art will understand that the illustrated structure does not constitute a limitation of the system, and may include more or less components than those illustrated, or combine some components, or arrange different components.
Fig. 3 is a schematic structural diagram of an exemplary verification system for detecting a positioning error of an oscillatory wave partial discharge detection system, as shown in fig. 3, the system including:
the standard signal generating module 201 is configured to receive a test signal for an error test, and control a preset waveform generator to generate a double-pulse signal meeting a set condition according to the test signal.
And the standard value generating module 202 is configured to obtain a dipulse interval time of the dipulse signal, and obtain a standard positioning value corresponding to the dipulse signal according to the dipulse interval time and a preset measured cable length.
The measurement module 203 is configured to input the double-pulse signal into a detected oscillation wave partial discharge detection system, and obtain a measurement positioning value of the detected oscillation wave partial discharge detection system for the double-pulse signal.
And the error verification module 204 is configured to obtain a positioning error of the detected oscillation wave partial discharge detection system according to the standard positioning value and the measurement positioning value.
In an embodiment, the standard signal generating module 201 is further configured to analyze the test signal to obtain parameter information of the double-pulse signal; the parameter information comprises pulse width information, rising edge time information, double-pulse interval time information and amplitude information of the double-pulse signal; and generating a double-pulse signal according to the parameter information, wherein the pulse width, the rising edge time, the double-pulse time interval and the amplitude of the front pulse and the back pulse of the generated double-pulse signal follow a mathematical model of the apparent discharge amount.
Optionally, after the standard signal generating module 201 generates the double-pulse signal, it is further determined whether the double-pulse signal meets a set condition, specifically, it is determined whether the double-pulse signal meets the set condition by the following method: inputting a dipulse signal generated according to a test signal into an oscilloscope, and measuring the dipulse signal with a parameter value approximately equal to the parameter information, wherein whether the dipulse signal is approximately equal can be judged by setting a threshold, for example, when judging whether the dipulse interval time of the dipulse signal meets the requirement, if the dipulse interval time of the dipulse signal generated according to the parameter information and the apparent discharge amount model is 8 mus, the threshold is set to +/-0.1 mus, and the dipulse interval time of the dipulse signal generated by detecting through the oscilloscope is 7.95 mus, the parameter of the dipulse interval time is judged to meet the approximately equal condition, and when all the parameters are approximately equal, the dipulse signal is judged to meet the set condition.
In an embodiment, the standard value generating module 202 is further configured to obtain a dipulse interval time of the dipulse signal according to the parameter information; or inputting the double-pulse signal into an oscilloscope, and acquiring the double-pulse interval time of the double-pulse signal through the oscilloscope. When the test is carried out, the double-pulse interval time can be obtained by directly using the parameter information, and the double-pulse interval time can be obtained by measuring a double-pulse signal by using an oscilloscope. One of the two methods may be selected, or the two methods may be simultaneously adopted, and the average value thereof is calculated and taken as the double pulse interval time of the double pulse signal.
In another embodiment, the standard value generating module 202 is further configured to obtain a mathematical expression of a standard positioning value according to the dipulse interval time and the measured cable length as follows:
wherein x issRepresenting a standard orientation value; l represents the length of the tested cable; v. of0Representing the wave speed of a preset double-pulse signal; Δ tsRepresenting the double pulse interval time; k represents a preset positive integer.
In the present embodiment, a relation between the dipulse interval time and the standard positioning value is given, that is, in the case where the dipulse signal wave velocity and the measured cable length are determined, the dipulse interval time and the standard positioning value have a one-to-one correspondence relationship. In the above formula, k is preferably 2.
In an optional embodiment, the measurement module 203 is further configured to input the double pulse signal to a detected oscillation wave partial discharge detection system; and successively adjusting the amplitude of each double-pulse signal to different amplitudes, reading the measurement positioning value of the measured oscillation wave partial discharge detection system aiming at the double-pulse signal under each amplitude, and averaging to obtain the measurement positioning value of the double-pulse signal.
Furthermore, for the same detected oscillation wave partial discharge detection system, a plurality of groups of double pulse signals may be input into the measurement module 203, for example: the setting method of the equal difference sequence may be adopted for setting the double pulse time of the 5 double pulse signals, for example, the preset cable lengths corresponding to the 5 double pulse signals are set to be different in a manner that the double pulse interval time of the five double pulse signals is respectively set to be 8 μ s, 10 μ s, 12 μ s, 14 μ s and 16 μ s, and may be respectively set to be 500m, 800m, 1100m, 1400m and 1700 m. 5 different dipulse signals are set and each dipulse signal sets 5 different amplitude magnitudes, for example: 1V, 2V, 3V, 4V and 5V. The above-mentioned multiunit experimental data that sets up, its purpose is in order to guarantee the accuracy of testing on different distances, consequently, can also set up multiunit experiment through other modes, and it is not repeated here.
In one embodiment, in the error verification module 204, the mathematical expression of the positioning error for error verification is:
wherein E islIndicating a positioning error, xmIndicating the measured position value.
Optionally, the error verification module 204 correspondingly inputs the 5 standard positioning values corresponding to the 5 groups of double-pulse signals and the 5 measured positioning values obtained by using the 5 double-pulse signals into the mathematical expression of the positioning error, and calculates to obtain 5 positioning errors; and acquiring the maximum value of the 5 positioning errors as the positioning error of the detected oscillation wave partial discharge detection system.
In this embodiment, 5 sets of measured positioning values obtained by corresponding measurement in the previous embodiment, and standard positioning values obtained by calculating the double-pulse signals corresponding to the measured positioning values are input into the mathematical expression for calculating the positioning error, so as to obtain 5 positioning errors. The maximum value of the 5 positioning errors is used as the positioning error of the detected oscillation wave partial discharge detection system, and in addition, how many groups of data can be obtained according to the test requirements, and the method is not limited to 5 groups.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above may be implemented by hardware associated with computer program instructions, and the programs may be stored in a computer readable storage medium and sold or used as a stand-alone product. The program, when executed, may perform all or a portion of the steps of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
In an embodiment, the storage medium may also be provided in a computer device, the computer device further including a processor. The processor, when executing the program in the storage medium, may perform all or a portion of the steps of the embodiments of the methods described above.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A method for calibrating a positioning error of an oscillatory wave partial discharge detection system is characterized by comprising the following steps:
receiving a test signal of an error test, and controlling a preset waveform generator to generate a double-pulse signal meeting a set condition according to the test signal;
acquiring the double-pulse interval time of the double-pulse signal, and obtaining a standard positioning value corresponding to the double-pulse signal according to the double-pulse interval time and the preset length of the tested cable;
inputting the double-pulse signal into a detected oscillation wave partial discharge detection system to obtain a measurement positioning value of the detected oscillation wave partial discharge detection system for the double-pulse signal;
obtaining a positioning error of the detected oscillation wave partial discharge detection system according to the standard positioning value and the measurement positioning value;
the obtaining of the positioning error of the detected oscillation wave partial discharge detection system according to the standard positioning value and the measurement positioning value comprises:
when at least two positioning error values of the detected oscillatory wave partial discharge detection system are obtained, selecting the maximum value from the at least two positioning error values as the positioning error of the detected oscillatory wave partial discharge detection system;
the step of generating a dipulse signal satisfying a set condition according to the test signal includes:
analyzing the test signal to obtain parameter information of the dipulse signal; the parameter information comprises pulse width information, rising edge time information, double-pulse interval time information and amplitude information of the double-pulse signal;
generating a double-pulse signal according to the parameter information, wherein the pulse width, the rising edge time, the double-pulse time interval and the amplitude of the generated front pulse and the back pulse of the double-pulse signal follow a mathematical model of the apparent discharge amount;
the step of obtaining the dipulse interval time of the dipulse signal further includes:
obtaining the double-pulse interval time of the double-pulse signal according to the parameter information;
or inputting the double-pulse signal into an oscilloscope, and acquiring the double-pulse interval time of the double-pulse signal through the oscilloscope.
2. The method for calibrating the positioning error of the oscillatory wave partial discharge detection system according to any one of the claims 1, wherein the step of obtaining the standard positioning value according to the dipulse interval time and the preset length of the cable to be detected comprises the following steps:
the mathematical expression of obtaining the standard positioning value according to the double-pulse interval time and the length of the tested cable is as follows:
wherein x issRepresenting a standard orientation value; l represents the length of the tested cable; v. of0Indicating a preset double pulse signalThe wave velocity of (a); Δ tsRepresenting the double pulse interval time; k represents a preset positive integer.
3. The method for calibrating the positioning error of the oscillatory wave partial discharge detection system according to claim 2, wherein the step of inputting the double-pulse signal into the measured oscillatory wave partial discharge detection system to obtain the measured positioning value of the measured oscillatory wave partial discharge detection system for the double-pulse signal comprises:
inputting the double-pulse signal into a detected oscillation wave partial discharge detection system;
and successively adjusting the amplitude of each double-pulse signal to different amplitudes, reading the measurement positioning value of the measured oscillation wave partial discharge detection system aiming at the double-pulse signal under each amplitude, and averaging to obtain the measurement positioning value of the double-pulse signal.
4. The method for calibrating the positioning error of the oscillatory wave partial discharge detection system according to claim 3, wherein the step of obtaining the positioning error of the measured oscillatory wave partial discharge detection system according to the standard positioning value and the measured positioning value comprises:
the mathematical expression of the positioning error is as follows:
wherein E islIndicating a positioning error, xmIndicating the measured position value.
5. The calibration method for positioning errors of the oscillatory wave partial discharge detection system according to claim 1, wherein the dipulse signal satisfying the set condition is a dipulse signal obtained by inputting a dipulse signal generated according to the test signal into an oscilloscope and measuring the dipulse signal to obtain a parameter value approximately equal to the parameter information.
6. An oscillatory wave partial discharge detection system calibration system for positioning errors, the system comprising:
the standard signal generation module is used for receiving a test signal of an error test and controlling a preset waveform generator to generate a double-pulse signal meeting a set condition according to the test signal;
the standard value generating module is used for acquiring the double-pulse interval time of the double-pulse signal and obtaining a standard positioning value corresponding to the double-pulse signal according to the double-pulse interval time and the preset length of the tested cable;
the measurement module is used for inputting the double-pulse signal into a detected oscillation wave partial discharge detection system and acquiring a measurement positioning value of the detected oscillation wave partial discharge detection system for the double-pulse signal;
the error verification module is used for obtaining the positioning error of the detected oscillation wave partial discharge detection system according to the standard positioning value and the measurement positioning value;
the error verification module is further used for selecting a maximum value from at least two positioning error values to serve as the positioning error of the measured oscillatory wave partial discharge detection system when the at least two positioning error values of the measured oscillatory wave partial discharge detection system are obtained;
the standard signal generation module is also used for analyzing the test signal to obtain parameter information of the double-pulse signal; the parameter information comprises pulse width information, rising edge time information, double-pulse interval time information and amplitude information of the double-pulse signal; generating a double-pulse signal according to the parameter information, wherein the pulse width, the rising edge time, the double-pulse time interval and the amplitude of the generated front pulse and the back pulse of the double-pulse signal follow a mathematical model of the apparent discharge amount;
the standard value generating module is also used for obtaining the double-pulse interval time of the double-pulse signal according to the parameter information; or inputting the double-pulse signal into an oscilloscope, and acquiring the double-pulse interval time of the double-pulse signal through the oscilloscope.
7. The verification system for positioning error of oscillatory wave partial discharge detection system according to claim 6, wherein the standard value generation module is further configured to obtain a mathematical expression of a standard positioning value according to the dipulse interval time and the length of the cable to be detected, wherein the mathematical expression is as follows:
wherein x issRepresenting a standard orientation value; l represents the length of the tested cable; v. of0Representing the wave speed of a preset double-pulse signal; Δ tsRepresenting the double pulse interval time; k represents a preset positive integer.
8. The oscillatory wave partial discharge detection system positioning error verification system of claim 6, wherein the measurement module is further configured to input the double pulse signal into the oscillatory wave partial discharge detection system under test; and successively adjusting the amplitude of each double-pulse signal to different amplitudes, reading the measurement positioning value of the measured oscillation wave partial discharge detection system aiming at the double-pulse signal under each amplitude, and averaging to obtain the measurement positioning value of the double-pulse signal.
9. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 5.
10. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the steps of the method of any of claims 1-5 are performed when the program is executed by the processor.
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| CN201711004132.1A CN107861033B (en) | 2017-10-24 | 2017-10-24 | Calibration method and system for positioning error of oscillation wave partial discharge detection system |
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