CN111426924A - High-frequency partial discharge signal mode recognition function verification method and system - Google Patents
High-frequency partial discharge signal mode recognition function verification method and system Download PDFInfo
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Abstract
The application discloses a high-frequency partial discharge signal mode identification function verification method and a system, comprising the following steps: the device comprises a control computer, a programmable pulse generating device, a signal coupling device and a high-frequency partial discharge detection device; the control computer inputs the high-frequency partial discharge signal into the programmable pulse generator, and the programmable pulse sequence generator conditions the signal and feeds the signal into the signal coupling device; the checked high-frequency partial discharge detection device couples the signal through a high-frequency current sensor and transmits detection data and a result to a control computer through a unified data protocol; the control computer compares whether the signal received by the programmable pulse sequence generating device is consistent with the signal output by the high-frequency partial discharge detection device, if so, the verified high-frequency partial discharge detection device has accurate pattern recognition capability; otherwise, the diagnostic result of the checked frequency partial discharge detection device is incorrect. The method can stably simulate real on-site high-frequency partial discharge signals and realize the standardized verification of the mode identification function of the high-frequency partial discharge detector.
Description
Technical Field
The application relates to the field of electrical equipment partial discharge information processing, in particular to a high-frequency partial discharge signal mode identification function verification method and system.
Background
Partial discharge detection is the most important technical means in the current operation state detection technology of the electrical equipment, and the function verification of partial discharge detection instruments is the primary premise of network access detection of the instruments. At present, the calibration for high-frequency partial discharge detection instruments at home and abroad mainly focuses on the performance assessment of high-frequency sensors, including the indexes of transmission impedance, sensitivity, linearity and the like of the sensors, and the calibration research for the mode identification function of the high-frequency partial discharge detection instrument is not reported yet.
The mode recognition function verification of the high-frequency partial discharge detector is mainly realized through two modes: one method is to go to the on-site actual measurement of the transformer substation, but the on-site partial discharge environment is complex and variable, the actual measurement has a lot of uncertainties, and the test is time-consuming and labor-consuming. The other method is to design a typical defect model of partial discharge and generate a partial discharge signal in a pressurization mode, but the method has no stability and mainly reflects the conditions that the signal amplitude is not adjustable, the discharge continuity cannot be ensured, the discharge type is switched inconveniently and the like.
Therefore, a high-frequency-based partial discharge signal detection method is needed to achieve standardized verification of the pattern recognition function of the high-frequency partial discharge detection apparatus.
Disclosure of Invention
The application provides a high-frequency partial discharge signal pattern recognition function verification method and a high-frequency partial discharge signal pattern recognition function verification system, which comprise the following steps: the device comprises a control computer, a programmable pulse generating device, a signal coupling device and a high-frequency partial discharge detection device;
the control computer inputs the high-frequency partial discharge signal into the programmable pulse generator, and the programmable pulse sequence generator conditions the signal and feeds the signal into the signal coupling device;
the checked high-frequency partial discharge detection device couples the signal through a high-frequency current sensor and transmits detection data and a result to a control computer through a unified data protocol;
the control computer compares whether the signal received by the programmable pulse sequence generating device is consistent with the signal output by the high-frequency partial discharge detection device, if so, the verified high-frequency partial discharge detection device has accurate mode identification capability; otherwise, the diagnostic result of the checked frequency partial discharge detection device is incorrect.
The high-frequency partial discharge signal pattern recognition function verification system comprises a control computer, a programmable pulse sequence generator and a high-frequency partial discharge signal pattern recognition function verification system, wherein the control computer comprises an automatic comparison analysis system, a high-frequency partial discharge sample library and a data storage unit, the automatic comparison analysis system reads stored data of the high-frequency partial discharge sample library into the data storage unit, and the data are sent to the programmable pulse sequence generator after signal reconstruction operation.
The high-frequency partial discharge signal pattern recognition function verification system comprises a high-frequency partial discharge detection device, a high-frequency partial discharge detector and a high-frequency partial discharge detector, wherein the high-frequency partial discharge detection device is an oscilloscope or a high-frequency partial discharge instrument, the oscilloscope outputs a waveform frequency spectrum, and the high-frequency partial discharge instrument outputs a partial discharge instrument map.
The high-frequency partial discharge signal pattern recognition function verification system comprises a programmable pulse sequence generation device, a signal coupling device and a high-frequency partial discharge detector, wherein the programmable pulse sequence generation device is used for generating high-frequency typical partial discharge pulses, the high-frequency typical partial discharge pulses are transmitted out through the signal coupling device, and the acquisition end receives signals through the high-frequency current sensor through the oscilloscope or the high-frequency partial discharge detector.
The high-frequency partial discharge signal mode identification function verification system comprises a signal coupling device, a signal detection device, a signal processing device and a signal processing device, wherein the signal coupling device is used for installing a calibrated high-frequency current sensor and is of a transmission line structure formed by deforming an RF coaxial line with the characteristic impedance of 50 omega; the high-frequency current sensor is clamped in the middle of the matching unit, the core wire and the shell of the matching unit meet the requirement that the characteristic impedance is 50 omega, the shell is in a tapered transition structure in a transition from the input terminal and the output terminal to the center to meet the requirement of broadband matching, and the output end of the matching unit is connected to a digital oscilloscope with the input impedance of 50 omega through an RF coaxial cable to acquire the voltage/current waveform output by a signal source.
The verification system for the high-frequency partial discharge signal pattern recognition function, wherein the verified high-frequency partial discharge detection device couples the signal through the high-frequency current sensor, and the specific principle is as follows: when a local power supply is partially discharged, a steep pulse current i is generated along with the discharging process, a magnetic field is generated when the pulse current i flows through a grounding down lead, the magnetic field is positioned on a plane vertical to the current propagation direction, and the high-frequency current sensor and the phase information sensor are arranged on a grounding wire of power equipment, so that energy can be coupled from the magnetic field generated by the partial discharge, and the coupling of signals is realized in a mode of converting the magnetic field into an electric signal through a coil.
The present application further provides a high-frequency partial discharge signal pattern recognition function verification method, which is applied to any one of the above-mentioned high-frequency partial discharge signal pattern recognition function verification systems, and the method includes:
controlling a computer to read the stored data of the high-frequency partial discharge sample library;
the control computer carries out signal reconstruction operation on the generated partial discharge signal and then sends the partial discharge signal to the programmable pulse generator;
the programmable pulse sequence generator conditions the signal and feeds the signal into the signal coupling device;
the high-frequency partial discharge detection device couples the signal through a high-frequency current sensor and transmits detection data and a result to a control computer;
the control computer compares whether the signal received by the programmable pulse sequence generating device is consistent with the signal received by the high-frequency partial discharge detection device, if so, the verified high-frequency partial discharge detection device has accurate pattern recognition capability; otherwise, the diagnosis result of the checked high-frequency partial discharge detection device is incorrect.
The verification method for the high-frequency partial discharge signal mode identification function comprises the steps that a control computer comprises an automatic comparison analysis system, a high-frequency partial discharge sample library and a data storage unit; the control computer carries out signal reconstruction operation on the generated partial discharge signal and then sends the partial discharge signal to the programmable pulse generator, and the method specifically comprises the following steps: the automatic comparison analysis system reads the stored data of the high-frequency partial discharge sample library into the data storage unit, and sends the data to the programmable pulse sequence generator after signal reconstruction operation.
The verification method for the high-frequency partial discharge signal pattern recognition function, wherein the method further comprises the step of comparing and evaluating model recognition, and specifically comprises the following substeps:
starting measurement and control analysis software, and selecting a typical partial discharge signal type;
selecting an output channel of an arbitrary waveform generator, and starting signal output;
performing operations such as parameter setting, gain regulation and control and the like according to spectrogram characteristics;
and judging whether a channel interface exists, if so, generating a mode identification evaluation report, and otherwise, manually inputting the detection result into measurement and control software.
By adopting the high-frequency partial discharge signal detection method and system provided by the application, the real high-frequency partial discharge signal in the field can be stably simulated, and the standardized verification of the mode identification function of the high-frequency partial discharge detector is realized.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to the drawings.
FIG. 1 is a schematic diagram of a high frequency partial discharge detection principle;
fig. 2 is a schematic diagram of a high-frequency partial discharge signal pattern recognition function verification system according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of a signal coupling device;
fig. 4 is a table of results of simulation functions of high frequency partial discharge signals in an actual test process;
fig. 5 is a flowchart of a verification method for high-frequency partial discharge signal pattern recognition function according to a second embodiment of the present application;
fig. 6 is a flowchart of a method for comparative evaluation of model identification.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Before introducing the high-frequency partial discharge signal pattern recognition function verification method and system of the present application, a high-frequency partial discharge pattern recognition function verification principle is explained: as shown in fig. 1, when a partial discharge source is partially discharged, a very steep pulse current i is generated along with a discharge process, a magnetic field is generated when the pulse current i flows through a grounding down conductor, the magnetic field is positioned on a plane perpendicular to a current propagation direction, and a high-frequency current sensor and a phase information sensor are installed on a grounding line of power equipment, so that energy can be coupled from the magnetic field generated by the partial discharge, and a partial discharge fault in the power equipment can be detected in a mode that a coil is converted into an electric signal.
Example one
Based on the high-frequency partial discharge detection principle, the first embodiment of the present application provides a high-frequency partial discharge signal pattern recognition function verification system, as shown in fig. 2, which includes a control computer, a programmable pulse generation device, a signal coupling device, and a high-frequency partial discharge detection device;
the control computer comprises an automatic comparison analysis system, a high-frequency partial discharge sample library and a data storage unit, wherein the automatic comparison analysis system reads the stored data of the high-frequency partial discharge sample library into the data storage unit, and sends the data to the programmable pulse sequence generator after signal reconstruction operation;
the programmable pulse sequence generator conditions and feeds a signal into the signal coupling device, the checked high-frequency partial discharge detection device couples the signal through the high-frequency current sensor, and detection data and results are transmitted to the automatic comparison analysis system through a unified data protocol;
the high-frequency partial discharge detection device can be an oscilloscope or a high-frequency partial discharge instrument, the oscilloscope outputs a waveform frequency spectrum, and the high-frequency partial discharge instrument outputs a partial discharge instrument map; specifically, a programmable pulse sequence generating device is used for generating high-frequency typical partial discharge pulses, the high-frequency typical partial discharge pulses are transmitted out through a coupling tool, and a collecting end receives signals through an oscilloscope or a high-frequency partial discharge detector and a high-frequency current sensor.
The signal coupling device is used for installing a calibrated high-frequency current sensor and is a transmission line structure formed by deforming an RF coaxial line with the characteristic impedance of 50 omega, and the structure diagram of the transmission line structure is shown in figure 3; the high-frequency current sensor is clamped in the middle of the matching unit, the core wire and the shell of the matching unit meet the requirement that the characteristic impedance is 50 omega, the shell is in a tapered transition structure in a transition from the input terminal and the output terminal to the center to meet the requirement of broadband matching, and the output end of the matching unit is connected to a digital oscilloscope with the input impedance of 50 omega through an RF coaxial cable to acquire the voltage/current waveform output by a signal source.
The automatic comparison analysis system compares the type and the atlas of the sent signal with the detection result of the high-frequency partial discharge detection device, namely compares the signal received by the programmable pulse sequence generation device with the signal output by the oscilloscope/high-frequency partial discharge instrument, and if the mode identification result of the high-frequency partial discharge detection device is consistent with the type sent by the automatic comparison analysis system, the verified device has accurate mode identification capability; otherwise, the result of the diagnosis of the verified device is incorrect. Fig. 4 is a table of results of simulation functions of high frequency partial discharge signals in an actual test process.
The high-frequency partial discharge signal pattern recognition function verification system can detect the pattern recognition performance of different high-frequency partial discharge detection devices, for example, two types of equipment are tested, the verification comparison result is shown in the following table 1, the comparison result shows that the two types of equipment have high recognition efficiency on suspension discharge, free particle discharge and metal point discharge, have low recognition efficiency on edge surface and air gap discharge and are easy to confuse;
TABLE 1
Example two
Based on the high-frequency partial discharge signal pattern recognition function verifying system provided by the embodiment, a second embodiment of the present application provides a high-frequency partial discharge signal pattern recognition function verifying method, as shown in fig. 5, including:
the control computer comprises an automatic comparison analysis system, a high-frequency partial discharge sample library and a data storage unit; the control computer carries out signal reconstruction operation on the generated partial discharge signal and then sends the partial discharge signal to the programmable pulse generator, and the method specifically comprises the following steps: the automatic comparison analysis system reads the stored data of the high-frequency partial discharge sample library into the data storage unit, and sends the data to the programmable pulse sequence generator after signal reconstruction operation.
Further, after the detection of the high-frequency partial discharge signal is completed, the embodiment of the present application further includes performing comparison evaluation on model identification, as shown in fig. 6, and specifically includes the following sub-steps:
and step 640, judging whether a channel interface exists, if so, generating a mode identification evaluation report, and otherwise, manually inputting a detection result into measurement and control software.
The above-mentioned embodiments are only specific embodiments of the present application, and are used for illustrating the technical solutions of the present application, but not limiting the same, and the scope of the present application is not limited thereto, and although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope disclosed in the present application; such modifications, changes or substitutions do not depart from the spirit and scope of the present disclosure, which should be construed in light of the above teachings. Are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (9)
1. A high frequency partial discharge signal pattern recognition function verification system, comprising: the device comprises a control computer, a programmable pulse generating device, a signal coupling device and a high-frequency partial discharge detection device;
the control computer inputs the high-frequency partial discharge signal into the programmable pulse generator, and the programmable pulse sequence generator conditions the signal and feeds the signal into the signal coupling device;
the checked high-frequency partial discharge detection device couples the signal through a high-frequency current sensor and transmits detection data and a result to a control computer through a unified data protocol;
the control computer compares whether the signal received by the programmable pulse sequence generating device is consistent with the signal output by the high-frequency partial discharge detection device, if so, the verified high-frequency partial discharge detection device has accurate mode identification capability; otherwise, the diagnostic result of the checked frequency partial discharge detection device is incorrect.
2. The system for verifying the high-frequency partial discharge signal pattern recognition function according to claim 1, wherein the control computer comprises an automatic comparison analysis system, a high-frequency partial discharge sample library and a data storage unit, wherein the automatic comparison analysis system reads the stored data of the high-frequency partial discharge sample library into the data storage unit, and sends the data to the programmable pulse sequence generator after signal reconstruction operation.
3. The system for verifying pattern recognition of high-frequency partial discharge signals according to claim 1, wherein the high-frequency partial discharge detection device is an oscilloscope or a high-frequency partial discharge instrument, the oscilloscope outputs a waveform spectrum, and the high-frequency partial discharge instrument outputs a partial discharge instrument spectrum.
4. The high-frequency partial discharge signal pattern recognition function verification system according to claim 3, wherein the high-frequency typical partial discharge pulse is generated by the programmable pulse sequence generation device and then emitted through the signal coupling device, and the acquisition end receives the signal through the high-frequency current sensor by an oscilloscope or a high-frequency partial discharge detector.
5. The system for verifying the high-frequency partial discharge signal pattern recognition function as claimed in claim 1 or 4, wherein the signal coupling device is used for mounting a calibrated high-frequency current sensor and is a transmission line structure formed by deforming an RF coaxial line with the characteristic impedance of 50 Ω; the high-frequency current sensor is clamped in the middle of the matching unit, the core wire and the shell of the matching unit meet the requirement that the characteristic impedance is 50 omega, the shell is in a tapered transition structure in a transition from the input terminal and the output terminal to the center to meet the requirement of broadband matching, and the output end of the matching unit is connected to a digital oscilloscope with the input impedance of 50 omega through an RF coaxial cable to acquire the voltage/current waveform output by a signal source.
6. The system for verifying high frequency partial discharge signal pattern recognition function of claim 1, wherein the verified high frequency partial discharge detection device couples the signal through a high frequency current sensor by the specific principle of: when a local power supply is partially discharged, a steep pulse current i is generated along with the discharging process, a magnetic field is generated when the pulse current i flows through a grounding down lead, the magnetic field is positioned on a plane vertical to the current propagation direction, and the high-frequency current sensor and the phase information sensor are arranged on a grounding wire of power equipment, so that energy can be coupled from the magnetic field generated by the partial discharge, and the coupling of signals is realized in a mode of converting the magnetic field into an electric signal through a coil.
7. A high frequency partial discharge signal pattern recognition function verification method applied to the high frequency partial discharge signal pattern recognition function verification system according to any one of claims 1 to 6, the method comprising:
controlling a computer to read the stored data of the high-frequency partial discharge sample library;
the control computer carries out signal reconstruction operation on the generated partial discharge signal and then sends the partial discharge signal to the programmable pulse generator;
the programmable pulse sequence generator conditions the signal and feeds the signal into the signal coupling device;
the high-frequency partial discharge detection device couples the signal through a high-frequency current sensor and transmits detection data and a result to a control computer;
the control computer compares whether the signal received by the programmable pulse sequence generating device is consistent with the signal received by the high-frequency partial discharge detection device, if so, the verified high-frequency partial discharge detection device has accurate pattern recognition capability; otherwise, the diagnosis result of the checked high-frequency partial discharge detection device is incorrect.
8. The verification method for high-frequency partial discharge signal pattern recognition function according to claim 7, wherein the control computer comprises an automatic comparison analysis system, a high-frequency partial discharge sample library and a data storage unit; the control computer carries out signal reconstruction operation on the generated partial discharge signal and then sends the partial discharge signal to the programmable pulse generator, and the method specifically comprises the following steps: the automatic comparison analysis system reads the stored data of the high-frequency partial discharge sample library into the data storage unit, and sends the data to the programmable pulse sequence generator after signal reconstruction operation.
9. The method for verifying the high-frequency partial discharge signal pattern recognition function according to claim 1, further comprising the step of comparing and evaluating model recognition, and specifically comprising the following substeps:
starting measurement and control analysis software, and selecting a typical partial discharge signal type;
selecting an output channel of an arbitrary waveform generator, and starting signal output;
performing operations such as parameter setting, gain regulation and control and the like according to spectrogram characteristics;
and judging whether a channel interface exists, if so, generating a mode identification evaluation report, and otherwise, manually inputting the detection result into measurement and control software.
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Application publication date: 20200717 |