CN111812463A - High-frequency partial discharge detection system and method - Google Patents
High-frequency partial discharge detection system and method Download PDFInfo
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- CN111812463A CN111812463A CN202010521527.4A CN202010521527A CN111812463A CN 111812463 A CN111812463 A CN 111812463A CN 202010521527 A CN202010521527 A CN 202010521527A CN 111812463 A CN111812463 A CN 111812463A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/16—Spectrum analysis; Fourier analysis
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Abstract
The application relates to a high-frequency partial discharge detection system and a high-frequency partial discharge detection method. The signal acquisition device is used for acquiring mixed signals; the frequency selection device is in signal connection with the signal acquisition device and is used for acquiring signals of preset transmission frequency points in the mixed signals to obtain frequency selection signals; the partial discharge signal detection device is in signal connection with the frequency selection device and is used for detecting partial discharge signals in the frequency selection signals.
Description
Technical Field
The present application relates to the field of power system technologies, and in particular, to a high-frequency partial discharge detection system and method.
Background
The charged high-frequency partial discharge detection is the most effective means for detecting the line state of the high-voltage cable. Usually, the high frequency partial discharge detection is affected by interference signals. The high frequency partial discharge signal has a wide spectrum characteristic, and the interference signal has a frequency division characteristic.
In the conventional technology, a high-frequency partial discharge detector is generally used for detecting partial discharge signals. However, the detection accuracy of the partial discharge signal using the high-frequency partial discharge detector is low.
Disclosure of Invention
In view of the above, it is necessary to provide a high frequency partial discharge detection system and method.
In one aspect, an embodiment of the present application provides a high-frequency partial discharge detection system, including:
the signal acquisition device is used for acquiring a mixed signal, wherein the mixed signal comprises a partial discharge signal and an interference signal;
the frequency selection device is in signal connection with the signal acquisition device and is used for acquiring signals of preset transmission frequency points in the mixed signals to obtain frequency selection signals;
and the partial discharge signal detection device is in signal connection with the frequency selection device and is used for detecting partial discharge signals in the frequency selection signals.
In one embodiment, the frequency selecting device includes a plurality of fixed frequency modules, and the transmission frequency point of each fixed frequency module is different.
In one embodiment, the frequency-fixed module comprises:
the packaging box is provided with an accommodating cavity;
the input end of the frequency point integrated circuit is in signal connection with the signal acquisition device, the output end of the frequency point integrated circuit is in signal connection with the signal detection device, and the frequency point integrated circuit is arranged in the accommodating cavity.
In one embodiment, the frequency point integrated circuit includes:
the input end of the first LC circuit is in signal connection with the signal acquisition device;
a second LC circuit connected in parallel with the first LC circuit;
a first capacitor connected in series between the first LC circuit and the second LC circuit;
the output end of the third LC circuit is in signal connection with the partial discharge signal detection device;
a second capacitor connected in series between the second LC circuit and the third LC circuit.
In one embodiment, the method further comprises the following steps:
and the spectrum analyzer is in signal connection with the signal acquisition device and is used for performing spectrum analysis on the mixed signal to obtain an analysis result.
In one embodiment, the method further comprises the following steps:
and the control device is in signal connection between the spectrum analyzer and the frequency selection device and is used for determining the preset transmission frequency point according to the analysis result.
In one embodiment, the signal acquisition device is a high-frequency current transformer.
In another aspect, an embodiment of the present application provides a method for detecting by using the high-frequency partial discharge detection system as described above, where the method includes:
acquiring a mixed signal by using the signal acquisition device, wherein the mixed signal comprises a partial discharge signal and an interference signal;
acquiring signals of preset transmission frequency points in the mixed signals through the frequency selection device to obtain frequency selection signals;
the partial discharge signal detection means detects the partial discharge signal from the frequency selective signal.
In one embodiment, the high frequency partial discharge detection system further includes a spectrum analyzer and a control device, and before acquiring the frequency selection signal of a preset transmission frequency point in the mixed signal, the method includes:
performing spectrum analysis on the mixed signal by using the spectrum analyzer to determine a spectrum of the partial discharge signal and a spectrum of the interference signal;
and the control device determines the preset transmission frequency point according to the frequency spectrum of the partial discharge signal and the frequency spectrum of the interference signal.
In one embodiment, the determining, by the control device, the preset transmission frequency point according to the frequency spectrum of the partial discharge signal and the frequency spectrum of the interference signal includes:
determining a frequency point of the partial discharge signal and a frequency point of the interference signal according to the frequency spectrum of the partial discharge signal and the frequency spectrum of the interference signal;
and removing the frequency points which are the same as the frequency points of the interference signals from the frequency points of the partial discharge signals to obtain the preset transmission frequency points.
The high-frequency partial discharge detection system and the method provided by the embodiment of the application comprise a signal acquisition device, a frequency selection device and a partial discharge signal detection device, wherein the signal acquisition device is used for acquiring mixed signals. The frequency selection device is in signal connection with the partial discharge signal acquisition device and is used for selecting the mixed signals of different frequency points to transmit so as to obtain frequency selection signals. The partial discharge signal detection device is in signal connection with the frequency selection device and is used for detecting partial discharge signals in the frequency selection signals. In the high-frequency partial discharge detection system provided by the embodiment of the application, because the frequency characteristics of the interference signal and the partial discharge signal are different, the interference signal can be eliminated by the frequency selection device, so that the interference signal in the frequency selection signal is reduced, and the accuracy of partial discharge signal detection can be improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the description of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a high-frequency partial discharge detection system according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a high-frequency partial discharge detection system according to an embodiment of the present application;
fig. 3 is a schematic view illustrating an assembly structure of a fixed frequency module according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a frequency point integrated circuit according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of a high-frequency partial discharge detection system according to an embodiment of the present application;
fig. 6 is a schematic flowchart illustrating steps of a high-frequency partial discharge detection method according to an embodiment of the present application;
fig. 7 is a schematic flowchart illustrating steps of a high-frequency partial discharge detection method according to an embodiment of the present application;
fig. 8 is a schematic flowchart illustrating steps of a high-frequency partial discharge detection method according to an embodiment of the present application.
Description of reference numerals:
10. a high frequency partial discharge detection system;
100. a signal acquisition device;
200. a frequency selecting device;
210. a fixed frequency module;
220. a frequency point integrated circuit;
221. a first LC circuit;
222. a second LC circuit;
223. a first capacitor;
224. a third LC circuit;
225. a second capacitor;
230. packaging the box;
240. fastening screws;
250. a BNC joint;
300. a partial discharge signal detection device;
400. a spectrum analyzer;
500. and a control device.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and that modifications may be made by one skilled in the art without departing from the spirit and scope of the application and it is therefore not intended to be limited to the specific embodiments disclosed below.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings). In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present application and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be considered as limiting the present application.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
Electric power equipment in a power system can generate partial discharge in the using process so as to generate electromagnetic waves, and the electromagnetic waves can generate a transient voltage signal to ground when propagating outwards, wherein the signal is an partial discharge signal. The high-frequency partial discharge detection system can be used for detecting partial discharge signals generated by power equipment. For example: and detecting the partial discharge signal generated on the high-voltage cable line with the voltage level of 110kV or above by using the high-frequency partial discharge detection system. When detecting the partial discharge signal, the partial discharge signal is interfered by other signals, and the accuracy of detecting the partial discharge signal is affected.
The following describes the technical solutions of the present application and how to solve the above technical problems with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments. Embodiments of the present application will be described below with reference to the accompanying drawings.
Referring to fig. 1, an embodiment of the present application provides a high frequency partial discharge detection system 10. The high-frequency partial discharge detection system 10 includes a signal acquisition device 100, a frequency selection device 200, and a partial discharge signal detection device 300.
The signal acquisition device 100 is used for acquiring a mixed signal. The mixed signal is formed by mixing a partial discharge signal and an interference signal, namely the mixed signal comprises the partial discharge signal and the interference signal. The mixed signal may be characterized by a current signal or a voltage signal, and therefore the signal collecting apparatus 100 may be a device capable of collecting a current signal or a voltage signal. If the voltage signal of the mixed signal needs to be acquired, the signal acquisition device 100 may be a voltage sensor or a voltage transformer, etc. The present embodiment does not set any limit to the kind of the signal acquisition device 100, and does not set any limit to the setting position of the signal acquisition device 100 as long as the function thereof can be achieved.
The frequency selecting device 200 is in signal connection with the signal collecting device 100, and is configured to obtain a signal of a preset transmission frequency point in the mixed signal, so as to obtain a frequency selecting signal. The frequency selecting device 200 may be a device composed of a plurality of filters. The range of the frequency in the frequency selecting device 200 can be set according to the frequency of the mixed signal acquired by the signal acquiring device 100. The preset transmission frequency point may be all frequency points in the frequency range of the mixed signal, or may be a part of frequency points in the frequency range of the mixed signal. The frequency ranges of the partial discharge signal and the interference signal in the mixed signal are the same, the frequency of the partial discharge signal is continuous, and the frequency of the interference signal is discontinuous. The partial discharge signals corresponding to the preset transmission frequency points can all pass through the frequency selection device 200, and the preset transmission frequency points always have frequency points in the frequency points which do not include the interference signals, so that partial interference signals cannot pass through the frequency selection device 200, that is, partial interference signals can be filtered through the frequency selection device 200, and the interference signals included in the frequency selection signals can be reduced. The present embodiment does not limit the specific type, structure, etc. of the frequency selecting device 200, as long as the function thereof can be achieved. In a specific embodiment, the frequency range of the mixed signal is 1MHz-20MHz, and the preset transmission frequency points are 2MHz ± 0.2MHz, 5MHz ± 0.3MHz, 8MHz ± 0.3MHz, 12MHz ± 0.3Hz, 15MHz ± 1MHz, 17MHz ± 1MHz and the like.
The partial discharge signal detection device 300 is in signal connection with the frequency selection device 200, and is configured to detect a partial discharge signal in the frequency selection signal. Since the partial discharge signal is generally a pulse signal having a duration of less than 1 μ s, the partial discharge signal detection apparatus 300 is a detection apparatus that can detect a pulse signal. In one embodiment, the partial discharge signal detection apparatus 300 may be a partial discharge detector, which can sense high frequency signals generated by operating equipment faults, vibrations, leakage and electrical partial discharge, convert the high frequency signals into audio signals by using a unique heterodyne method, and allow a worker to hear the sounds through an earphone and see a signal strength indication on a pointer. Normally, the electrical equipment should be silent, although there is sometimes a constant hum or steady mechanical noise, which is completely different from the partial discharge generated sound signal, so the partial discharge signal can be detected by the partial discharge detector. The partial discharge detector can detect weak signals similar to blinking, has high sensitivity, is convenient to carry and simple to operate, and has high practicability. The embodiment of the present application does not limit the specific type, structure, and the like of the partial discharge signal detection apparatus 300, as long as the function thereof can be realized.
In a specific embodiment, the frequency-selective signal may be received by an oscilloscope, the oscilloscope may convert the received frequency-selective signal into a waveform diagram, and a worker may obtain a local signal by observing the waveform.
The specific working principle of the high-frequency partial discharge detection system 10 provided by the application is as follows:
the signal acquisition device 100 is used to acquire the mixed signal, and the mixed signal is input to the frequency selection device 200. The frequency selecting device 200 may obtain a signal of a preset transmission frequency point in the mixed signal to obtain a frequency selecting signal, and the frequency selecting signal is input to the partial discharge signal detecting device 300. The partial discharge signal detection apparatus 300 may detect a partial discharge signal in the frequency selection signal.
The high-frequency partial discharge detection system 10 provided by the embodiment of the application comprises a signal acquisition device 100, a frequency selection device 200 and a partial discharge signal detection device 300, wherein the signal acquisition device 100 is used for acquiring mixed signals. The frequency selection device 200 is in signal connection with the partial discharge signal detection device 300, and is configured to select the mixed signals of different frequency points for transmission, so as to obtain a frequency selection signal. The partial discharge signal detection device 300 is in signal connection with the frequency selection device 200, and is configured to detect a partial discharge signal in the frequency selection signal. The embodiment of the application provides high frequency partial discharge detection system 10 because interference signal with the partial discharge signal's frequency characteristic is different, then passes through frequency selection device 200 obtains the interference signal can be eliminated to the frequency selection signal, makes the interference signal who obtains in the frequency selection signal reduces, can improve the accuracy of putting signal detection to the office, and then makes the staff can accurately detect the partial discharge phenomenon that takes place in the electric power system, improves electric power system's security.
Referring to fig. 2, in an embodiment, the frequency selecting apparatus 200 includes a plurality of fixed frequency modules 210, and transmission frequency points of each of the fixed frequency modules 210 are different.
The number of the fixed frequency modules 210 is the same as the number of the preset transmission frequency points, that is, how many of the preset transmission frequency points are, how many of the fixed frequency modules 210 are set. The frequency point of each fixed frequency module 210 is the frequency point of the preset transmission frequency point. Each of the fixed frequency modules 210 is independently disposed without any connection therebetween. Specifically, for example: the preset transmission frequency points are 4 frequency points of 2MHz +/-0.2 MHz, 8MHz +/-0.3 MHz, 15MHz +/-1 MHz and 20MHz +/-1 MHz, and then 4 frequency points are set to be the fixed frequency module 210 of MHz +/-0.2 MHz, 8MHz +/-0.3 MHz, 15MHz +/-1 MHz and 20MHz +/-1 MHz4 respectively. In a specific embodiment, each of the frequency-fixed modules 210 may be a filter. The present embodiment does not limit the specific type, structure, etc. of the fixed frequency module 210, as long as the function thereof can be realized.
Referring to fig. 3, in one embodiment, the fixed frequency module 210 includes a frequency point integrated circuit 220 and a package box 230.
The frequency point integrated circuit 220 includes an input and an output. The input end of the frequency point integrated circuit 220 is in signal connection with the signal acquisition device 100, and the output end of the frequency point integrated circuit 220 is in signal connection with the signal detection device 300. The integrated circuit is a miniature electronic device or component, and is made up by using a certain technological process to make the elements of transistor, diode, resistor, capacitor or inductor, etc. required in a circuit and wiring interconnection together, and making them be made into small semiconductor wafer or medium substrate, then packaging them in a tube shell so as to obtain the miniature structure with required circuit function. The frequency point integrated circuit 220 is the frequency point integrated circuit 220 with a fixed frequency point formed by manufacturing electronic components required for obtaining a circuit with a fixed frequency point on a semiconductor wafer or a dielectric substrate by a certain process.
The packaging box 230 is provided with a containing cavity, and the frequency point integrated circuit 220 is arranged in the containing cavity. The enclosure 230 may be a rectangular parallelepiped structure, an ellipsoid structure, or another irregular-shaped three-dimensional structure. The material of the enclosure 230 may be stainless steel material, or hard plastic, etc. The size of the accommodating cavity can be set according to the size of the volume of the frequency point integrated circuit 220. The present embodiment does not limit the structure, material, size, etc. of the enclosure 230, as long as the function thereof can be achieved.
In this embodiment, the frequency point integrated circuit 220 has the advantages of small size, light weight, few lead wires and solder joints, long service life, high reliability, good performance, and the like. The frequency point integrated circuit 220 is packaged by using the packaging box 230, so that the frequency point integrated circuit 220 can be protected, and the frequency point integrated circuit 220 is prevented from being damaged by external factors. Therefore, the fixed frequency module 210 has the advantages of high reliability, strong practicability and the like, so that the high frequency partial discharge detection system 10 has strong reliability and practicability.
In one embodiment, as shown in fig. 3, the frequency-fixed module 210 further includes a fastening screw 240 and a BNC connector 250. The fastening screw 240 is disposed on the package box 230 and used for fixing the package box 230, so that the package box 230 is very firm and has high reliability. The BNC connector 250 is configured to implement signal connection between the frequency point integrated circuit 220 and the signal acquisition device 100 and the partial discharge signal detection device 300. The BNC Connector 250 is a Connector for coaxial cables, commonly known as a Bayonet Nut Connector, also known as a british naval Connector. The BNC connector 250 can isolate other input signals, so that mutual interference between signals is reduced, the signal bandwidth of the BNC connector 250 is larger than that of a common D-type interface, a better signal response effect can be achieved, the signal passing through the fixed frequency module 210 can not receive interference of other signals, and therefore reliability and practicability of the fixed frequency module 210 are improved, and further reliability and practicability of the high-frequency partial discharge detection system 10 are improved.
Referring to fig. 4, in an embodiment, the frequency point integrated circuit 220 includes a first LC circuit 221, a second LC circuit 222, a third LC circuit 224, a first capacitor 223, and a second capacitor 225. The input end of the first LC circuit 221 is used as the input end of the frequency point integrated circuit 220 and is in signal connection with the signal acquisition device 100. The output end of the third LC circuit 224 is used as the output end of the frequency point integrated circuit 220 and is in signal connection with the partial discharge signal detection apparatus 300. An LC circuit is a circuit composed of an inductor and a capacitor, which can generate an oscillating current or have a filtering function, and is usually connected in parallel with the inductor and the capacitor. LC circuits are used both to generate signals at specific frequencies and to separate signals at specific frequencies from more complex signals. The first LC circuit 221, the second LC circuit 222, and the third LC circuit 224 have the same structure. The first LC circuit 221 is connected in parallel with the second LC circuit 222, and the second LC circuit 222 is connected in parallel with the third LC circuit 224. The first capacitor 223 is connected in series between the first LC circuit 221 and the second LC circuit 222. The second capacitor 225 is connected in series between the second LC circuit 222 and the third LC circuit 224. By setting inductance values and capacitance values of the inductors and capacitors in the first LC circuit 221, the second LC circuit 222, and the third LC circuit 224, and capacitance values of the first capacitor 223 and the second capacitor 225, signals of fixed frequency points can be passed through. In this embodiment, the frequency point integrated circuit 220 has a simple structure, and can be formed by using commonly used electronic components, so that the cost is low.
Referring to fig. 5, in one embodiment, the high frequency partial discharge detection system 10 further includes a spectrum analyzer 400. The spectrum analyzer 400 is in signal connection with the signal acquisition device 100, and is configured to perform spectrum analysis on the mixed signal to obtain an analysis result. The analysis result is the frequency spectrum of the partial discharge signal and the frequency spectrum of the interference signal. The spectrum analyzer 400 is an instrument for researching the spectrum structure of an electric signal, is used for measuring signal parameters such as signal distortion degree, modulation degree, spectrum purity, frequency stability, intermodulation distortion and the like, can be used for measuring certain parameters of a circuit system such as an amplifier, a filter and the like, and is a multipurpose electronic measuring instrument. It may also be referred to as a frequency domain oscilloscope, a tracking oscilloscope, an analysis oscilloscope, a harmonic analyzer, a frequency characteristic analyzer, or a fourier analyzer, etc. The mixed signal may be subjected to spectrum analysis by the spectrum analyzer 400. The mixed signal comprises a partial discharge signal and an interference signal, the frequency spectrum characteristics of the interference signal of the partial discharge signal are different, the partial discharge signal has a wider frequency spectrum characteristic, and the frequency spectrum of the interference signal has a frequency division characteristic. Therefore, the staff can obtain the frequency point of the interference signal and the frequency point of the partial discharge signal according to the analysis result of the spectrum analyzer 400, and can select the transmission frequency point of the frequency selection device 200 according to the frequency point of the interference signal and the frequency point of the partial discharge signal. The transmission frequency points of the frequency selecting device 200 should select frequency points of the partial discharge signal, which do not include the frequency point of the interference signal, and the interference signal does not pass through the frequency selecting device 200, so that the partial discharge signal detecting device 300 can accurately detect the partial discharge signal. In this embodiment, before the mixed signal is input to the frequency selecting device 200, the mixed signal is subjected to spectrum analysis, and the preset transmission frequency point of the frequency selecting device 200 is selected according to an analysis result, so that most of the interference signals can be filtered, and the accuracy of the high-frequency partial discharge detection system 10 in detecting the partial discharge signals can be greatly improved.
With continued reference to fig. 5, in one embodiment, the high frequency partial discharge detection system further includes a control device 500. The control device 500 is in signal connection between the spectrum analyzer 400 and the frequency selecting device 200, and is configured to obtain the preset transmission frequency point according to the analysis result. The control device 500 may be, but is not limited to, a control chip, a personal computer, a notebook computer, a smart phone, a tablet computer, and a portable wearable device. The control device 500 may obtain a frequency point of the partial discharge signal and a frequency point of the interference signal according to the frequency spectrum of the partial discharge signal and the frequency spectrum of the interference signal obtained by the spectrum analyzer 400. The control device 500 may obtain the preset transmission frequency point by removing a frequency point, which is the same as the frequency point of the interference signal, from the frequency points of the partial discharge signal, and control the frequency selection device 200 to operate according to the preset transmission frequency point.
In one embodiment, the signal acquisition device 100 is a high frequency current transformer. The signal acquisition device 100 may characterize the mixed signal by acquiring a current signal. The principle of the high-frequency current transformer is based on the electromagnetic induction principle and generally consists of a closed iron core and a winding. The impedance of high frequency current transformer is very little, utilizes that high frequency current transformer gathers mixing information is comparatively accurate, makes acquireing the frequency selection signal is comparatively accurate, thereby makes the partial discharge detection device 300 detects the partial discharge signal is more accurate, and then has improved high frequency partial discharge detection system 10 is right the accuracy that the signal detected is put in the partial discharge.
Referring to fig. 6, an embodiment of the present application further provides a method for detecting by using the high-frequency partial discharge detection system 10 according to the above embodiment, including:
s100, acquiring a mixed signal by using the signal acquisition device 100, wherein the mixed signal comprises a partial discharge signal and an interference signal.
When the high-frequency partial discharge detection system 10 is used to detect the partial discharge signal generated by the high-voltage cable line, the partial discharge signal is subjected to interference signals generated by other devices, and therefore, the signal collected by the signal collection device 100 is the mixed signal formed by the partial discharge signal and the interference signals. For a specific description of the signal acquisition device 100, reference may be made to the description of the signal acquisition device 100 in the high-frequency partial discharge detection system 10, which is not repeated herein.
And S200, acquiring signals of preset transmission frequency points in the mixed signals through the frequency selection device 200 to obtain frequency selection signals.
Because the frequency characteristics of the partial discharge signal and the interference signal are different, a transmission frequency point can be preset, and the frequency point of the interference signal can be always not in the preset transmission frequency point. The frequency selection device 200 is used for obtaining signals of preset transmission frequency points in the mixed signal to obtain the frequency selection signal, so that part of interference signals can be filtered, namely, the interference signals in the frequency selection signal are reduced. For a detailed description of the frequency selecting device 200, reference may be made to the description of the frequency selecting device 200 in the high-frequency partial discharge monitoring system 10, which is not described herein again.
S300, the partial discharge signal detection apparatus 300 detects the partial discharge signal from the frequency-selective signal.
The interference signal reduction in the frequency selection signal is obtained by the frequency selection device 200, and the partial discharge signal can be more accurately detected when the frequency selection signal is detected by the partial discharge signal detection device 300. For a specific description of the partial discharge signal detection apparatus 300, reference may be made to the description of the partial discharge signal detection apparatus 300 in the high-frequency partial discharge detection system 10, and details are not repeated here.
In the method for detecting by using the high-frequency partial discharge detection system 10 provided by this embodiment, the frequency selection device 200 may filter the interference signal in the mixed signal to obtain the frequency selection signal, and the partial discharge signal detection device 300 may detect the partial discharge signal more accurately when detecting the frequency selection signal, thereby greatly improving the accuracy of detecting the partial discharge signal.
Referring to fig. 7, in an embodiment, the high frequency partial discharge detection system 10 further includes a spectrum analyzer 400 and a control device 500, and before the step S200 of acquiring the frequency selection signal of a preset transmission frequency point in the mixed signal, the method includes:
and S400, performing spectrum analysis on the mixed signal by using the spectrum analyzer 400, and determining the frequency spectrum of the partial discharge signal and the frequency spectrum of the interference signal.
And S500, the control device 500 determines the preset transmission frequency point according to the frequency spectrum of the partial discharge signal and the frequency spectrum of the interference signal.
Since the frequency characteristics and the frequency spectrum characteristics of the interference signals of the partial discharge signal are different, the mixed signal can be analyzed by using the spectrum analyzer 400, and the frequency spectrum of the partial discharge signal and the frequency spectrum of the interference signal can be determined. The control device 500 may determine the preset transmission frequency point of the frequency selecting device 200 according to the frequency spectrum of the partial discharge signal and the frequency spectrum of the interference signal. For a detailed description of the spectrum analyzer 400, reference may be made to the description of the spectrum analyzer 400 in the high frequency partial discharge detection system 10, and details are not repeated here.
Referring to fig. 8, in an embodiment, in step S500, the control device 500 determines the preset transmission frequency point according to the frequency spectrum of the partial discharge signal and the frequency spectrum of the interference signal, where the determining includes:
s510, determining a frequency point of the partial discharge signal and a frequency point of the interference signal according to the frequency spectrum of the partial discharge signal and the frequency spectrum of the interference signal.
S520, removing the frequency points which are the same as the frequency points of the interference signals from the frequency points of the partial discharge signals to obtain the preset transmission frequency points.
And determining the frequency point of the partial discharge signal according to the frequency spectrum of the partial discharge signal, and determining the frequency point of the interference signal according to the frequency spectrum of the interference signal. According to the frequency characteristics of the partial discharge signal and the interference signal, part of frequency points are frequency points of the partial discharge signal and are not frequency points of the interference signal, and the part of frequency points are the preset transmission frequency points. In other words, the frequency points which are the same as the frequency points of the interference signals in the frequency points of the partial discharge signals are removed, and the rest frequency points are the preset transmission frequency points.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as 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 application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A high frequency partial discharge detection system, comprising:
the signal acquisition device is used for acquiring a mixed signal, wherein the mixed signal comprises a partial discharge signal and an interference signal;
the frequency selection device is in signal connection with the signal acquisition device and is used for acquiring signals of preset transmission frequency points in the mixed signals to obtain frequency selection signals;
and the partial discharge signal detection device is in signal connection with the frequency selection device and is used for detecting partial discharge signals in the frequency selection signals.
2. The system according to claim 1, wherein the frequency selecting device comprises a plurality of fixed frequency modules, and a transmission frequency point of each fixed frequency module is different.
3. The high frequency partial discharge detection system according to claim 2, wherein the frequency-fixing module comprises:
the packaging box is provided with an accommodating cavity;
the input end of the frequency point integrated circuit is in signal connection with the signal acquisition device, the output end of the frequency point integrated circuit is in signal connection with the signal detection device, and the frequency point integrated circuit is arranged in the accommodating cavity.
4. The high frequency partial discharge detection system according to claim 3, wherein the frequency point integrated circuit comprises:
the input end of the first LC circuit is in signal connection with the signal acquisition device;
a second LC circuit connected in parallel with the first LC circuit;
a first capacitor connected in series between the first LC circuit and the second LC circuit;
the output end of the third LC circuit is in signal connection with the partial discharge signal detection device;
a second capacitor connected in series between the second LC circuit and the third LC circuit.
5. The high frequency partial discharge detection system according to claim 1, further comprising:
and the spectrum analyzer is in signal connection with the signal acquisition device and is used for performing spectrum analysis on the mixed signal to obtain an analysis result.
6. The high frequency partial discharge detection system according to claim 5, further comprising:
and the control device is in signal connection between the spectrum analyzer and the frequency selection device and is used for determining the preset transmission frequency point according to the analysis result.
7. The high frequency partial discharge detection system according to claim 1, wherein said signal acquisition device is a high frequency current transformer.
8. A method for detecting by using the high frequency partial discharge detection system according to any one of claims 1 to 7, the method comprising:
acquiring a mixed signal by using the signal acquisition device, wherein the mixed signal comprises a partial discharge signal and an interference signal;
acquiring signals of preset transmission frequency points in the mixed signals through the frequency selection device to obtain frequency selection signals;
the partial discharge signal detection means detects the partial discharge signal from the frequency selective signal.
9. The method according to claim 8, wherein the high frequency partial discharge detection system further comprises a spectrum analyzer and a control device, and before acquiring the frequency selection signal of a preset transmission frequency point in the mixed signal, the method comprises:
performing spectrum analysis on the mixed signal by using the spectrum analyzer to determine a spectrum of the partial discharge signal and a spectrum of the interference signal;
and the control device determines the preset transmission frequency point according to the frequency spectrum of the partial discharge signal and the frequency spectrum of the interference signal.
10. The method according to claim 9, wherein the determining, by the control device, the preset transmission frequency point according to the frequency spectrum of the partial discharge signal and the frequency spectrum of the interference signal includes:
determining a frequency point of the partial discharge signal and a frequency point of the interference signal according to the frequency spectrum of the partial discharge signal and the frequency spectrum of the interference signal;
and removing the frequency points which are the same as the frequency points of the interference signals from the frequency points of the partial discharge signals to obtain the preset transmission frequency points.
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