CN113325276A - GIS epoxy insulation surface defect partial discharge detection method and device - Google Patents
GIS epoxy insulation surface defect partial discharge detection method and device Download PDFInfo
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- 239000004593 Epoxy Substances 0.000 title claims abstract description 75
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- 239000003822 epoxy resin Substances 0.000 claims abstract description 54
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- 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
- G01R31/1218—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 using optical methods; using charged particle, e.g. electron, beams or X-rays
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- G—PHYSICS
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- 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
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Abstract
The invention provides a GIS epoxy insulation surface defect partial discharge detection method and a device, wherein the method comprises the following steps: acquiring a partial discharge signal of the epoxy insulation surface; performing statistical analysis on the partial discharge signals to determine the optimal test voltage, frequency and test time of different insulation defect types of the epoxy resin; detecting the insulation defects of the epoxy resin according to the optimal test voltage, frequency and test time of the epoxy resin with different insulation defect types; the device comprises: the data acquisition unit is used for acquiring a partial discharge signal of the GIS epoxy insulation surface; the data analysis unit is used for carrying out statistical analysis on the partial discharge signals and determining the optimal test voltage, frequency and test time of different insulation defect types of the epoxy resin; and the data output unit is used for detecting the insulation defects of the epoxy resin according to the optimal test voltage, frequency and test time of different insulation defect types of the epoxy resin.
Description
Technical Field
The invention belongs to the technical field of GIS partial discharge detection, and particularly relates to a GIS epoxy insulation surface defect partial discharge multi-source information joint detection device based on high-frequency voltage excitation.
Background
Since epoxy resin (EP) was discovered in 1909, it has been widely used as an important solid insulating material in various high and new electrical devices such as power machines, high voltage insulation switches, and converter transformer bushings due to its advantages of high mechanical strength, good thermal stability, easy curing, and superior insulating properties. Taking a Gas Insulated Switchgear (GIS) as an example, the basin-type insulator and the post-type insulator inside the gas insulated switchgear are made of epoxy resin. However, the epoxy resin insulation component is prone to surface defects due to factors such as complex manufacturing process, severe installation conditions, and susceptibility to electric-thermal-mechanical stress during operation. If surface defects are not detected at an early stage, continued development of these insulation defects will cause equipment failure. 256 faults of 35kV and above occur in China in the last decade, wherein 146 faults of epoxy resin insulation occur. Therefore, the effectiveness of the epoxy insulation surface defect detection technology has important significance for improving the safe and reliable operation of GIS equipment.
Usually, insulation faults are developed by some tiny defects, the defects can generate partial discharge in the GIS operation process, partial discharge signals contain rich equipment insulation state information, and latent insulation defects of the GIS can be effectively found through partial discharge live detection. However, various partial discharge detection means adopted at present have certain limitations, and especially (one) the recognition of the partial discharge amount of the submillimeter/millimeter-scale micro-metal particles on the surface of the insulator under the actual operation working condition is lacked; secondly, the existing detection device only aims at the discharge behavior with good repeatability, so that the intermittent discharge is ignored and missed, and finally the sudden breakdown and flashover of the GIS are caused; and thirdly, the anti-electromagnetic interference capability of the existing partial discharge online detection device is insufficient, and the requirement of an engineering field can not be met far away, so that the existing partial discharge online detection device has a large amount of false reports and missed reports.
According to the findings of the CIGRE WG33/23-12 research report: only 55% of insulation faults can be found in advance by the existing detection method before the faults occur, and the blind detection rate is as high as 45%.
According to the existing research, the partial discharge characteristic is influenced by the voltage frequency and the waveform, when the frequency is higher than 1kHz, the excitation effect of the high-frequency voltage on the partial discharge is gradually shown, the concealing characteristic of the epoxy resin defect can be effectively dealt with, and the fault can be found out as soon as possible.
Disclosure of Invention
The invention aims to provide a GIS epoxy insulation surface defect partial discharge multi-source information joint detection device based on high-frequency voltage excitation aiming at the effectiveness of GIS epoxy insulation surface defect partial discharge detection capability. In order to achieve the purpose, the invention adopts the following technical scheme:
GIS epoxy insulation surface defect partial discharge multisource information joint detection device based on high frequency voltage excitation includes: hardware configuration and software handlers; the hardware configuration comprises a high-frequency test voltage source, a protective resistor, a high-voltage probe, a high-speed oscilloscope, a signal processing computer, a partial discharge detector, a test cavity, a constant temperature and humidity box and a high-frequency coaxial cable; the software processing program is a partial discharge data acquisition and processing system based on an LABVIEW visualization program; the high-frequency test voltage source is respectively connected with the high-voltage probe and the test cavity through the protection resistor; the partial discharge detector is arranged at a test cavity, and the test cavity is arranged in the constant temperature and humidity box; the high-voltage probe and the partial discharge detector are connected with a high-speed oscilloscope through a high-frequency coaxial cable to transmit an epoxy insulation surface defect partial discharge signal; and the signal processing computer is connected with the high-speed oscilloscope, and is used for acquiring, processing and analyzing the partial discharge signals of the insulation surface defects through the partial discharge data acquisition and processing system.
Furthermore, the high-frequency test voltage source adopts a continuous adjustable sinusoidal excitation voltage source with the frequency of 1kHz-20kHz and the amplitude of 0-100 kV.
Furthermore, the protection resistor is formed by connecting a temperature protective tube and a voltage dependent resistor in series, and the voltage dependent resistor can enable a voltage clamp to be positioned at a relatively stable voltage value when overvoltage appears at two stages of the voltage dependent resistor by utilizing the nonlinear characteristic of the voltage dependent resistor, so that the protection of a rear-stage circuit is realized; in addition, when the piezoresistor fails, the temperature fuse tube can be fused by the generated heat, so that the high-frequency sinusoidal voltage source is separated from other equipment, and the setting safety is ensured.
Further, the high-pressure probe is a Tektronix P6015A model, and the attenuation ratio is 1000: 1, it can measure the voltage variation range that high frequency voltage test source exported more accurately.
Furthermore, the high-speed oscilloscope has fast rising rate of high-frequency sinusoidal voltage and short discharge duration, and in order to obtain higher discharge pulse resolution, the oscilloscope selects a high-speed oscilloscope with the highest sampling rate of 10GS/s, the sampling bandwidth of 1.5GHz and the model of YOKOGAWA DL 6154.
Further, the signal processing computer is loaded with a partial discharge data acquisition and processing system based on a LABVIEW visualization program, and the partial discharge data acquisition and processing system comprises data acquisition, data processing, data storage and data analysis; the data acquisition is to transmit a real-time partial discharge signal generated in the partial discharge detection test process of the insulation surface defect to a high-speed oscilloscope through a high-frequency coaxial cable, and the high-speed oscilloscope demodulates the obtained partial discharge signal into a digital signal and transmits the digital signal to a signal processing computer by utilizing a USB interface; the data processing is to perform noise reduction processing on the collected partial discharge signals by using Sym8 wavelets in a Symlets wavelet system, so that Gaussian white noise, random noise and high-frequency signal noise can be filtered while original partial discharge signal characteristics are kept; the data storage is to store the processed partial discharge signal in a partial discharge database to form partial discharge signal historical data; the data analysis is to perform statistical analysis on the historical data of the partial discharge signals in the partial discharge database, determine the optimal test voltage, frequency and test time of different insulation defect types of the epoxy resin, extract characteristic parameters and form a GIS epoxy insulation surface defect partial discharge characteristic library based on high-frequency voltage excitation.
Furthermore, the partial discharge detector consists of a high-frequency pulse current sensor, an ultrasonic sensor and a photomultiplier, and the photomultiplier is independently powered by a direct-current power supply; the partial discharge detector establishes a multi-source information combined detection device which takes a pulse current method, an ultrasonic method and an optical detection method as insulation defect detection means, comprehensively utilizes the advantages of the three defect detection methods, and further improves the detection and identification efficiency of the insulation defects of the epoxy resin interface.
The pulse current method has the obvious defects that the partial discharge identification sensitivity is difficult to effectively improve, partial discharge signals and external interference signals cannot be distinguished, a plurality of insulators are tested simultaneously, when any one insulator has a defect, the pulse current method cannot identify the defective insulator, and the like, and the pulse current method is modified into a pulse current distribution measurement method. The basic principle is that the original pulse current partial discharge signal centralized measurement is changed into the respective measurement of each test article, the partial discharge signal amplitude is improved, the interference signal amplitude is reduced, the signal to noise ratio is improved, the partial discharge signal and the external interference signal are distinguished by comparing the amplitude and the direction of the partial discharge pulse signal of each test article, and then the high-sensitivity measurement of the pulse current method partial discharge signal is realized;
the ultrasonic detection method has the advantages of flexible measurement position, small electromagnetic interference degree, simple and convenient operation, accurate positioning and good sensing effect on vibratory defects, particularly non-discharge defects caused by free particles, and takes the ultrasonic method as a main means for positioning the epoxy insulation surface defects and performs auxiliary verification on partial discharge of the epoxy insulation surface defects;
among them, the optical detection method has the advantages of being most intuitive, free from electromagnetic interference, high in sensitivity and the like, and is taken as the most important means for partial discharge detection.
The partial discharge detector utilizes a pulse current distribution measurement method to identify external interference signals; positioning the epoxy insulation surface defects by an ultrasonic method; the optical detection method is used as a main detection means for the partial discharge of the defects on the epoxy insulation surface, and a pulse current distribution measurement method and an ultrasonic wave method are used as auxiliary means for the partial discharge detection of the insulation defects, so that the detection and identification efficiency of the defects on the epoxy insulation surface is further improved.
Furthermore, the test cavity is an actual GIS scaling model to simulate a real GIS operating environment as much as possible, and the obtained partial discharge characteristic library of the epoxy insulation surface defects can more accurately represent insulation defects of different types of epoxy resin.
Furthermore, the constant temperature and humidity box with the temperature adjusting range of 0-40 ℃ and the humidity adjusting range of 20-70% is selected, so that the interference of the external environment to the test result in the test process is reduced.
Furthermore, the high-frequency coaxial cable adopts a coaxial cable with characteristic impedance of 50 omega and frequency band of 0-3GHz, and the shielding layer of the coaxial cable adopts silver plating shielding, so that the interference of the data transmission process on the local discharge signal is reduced.
Further, the partial discharge information of the GIS epoxy insulation surface defect comprises a discharge amplitude, a discharge phase, a discharge frequency and a discharge frequency.
A GIS epoxy insulation surface defect partial discharge multi-source information joint detection method comprises the following steps:
acquiring a partial discharge signal of the epoxy insulation surface;
performing statistical analysis on the partial discharge signals to determine the optimal test voltage, frequency and test time of different insulation defect types of the epoxy resin;
and detecting the insulation defects of the epoxy resin according to the optimal test voltage, frequency and test time of the epoxy resin with different insulation defect types.
Detecting the insulation defect of the epoxy resin according to the optimal test voltage, frequency and test time of different insulation defect types of the epoxy resin, and the method comprises the following steps: and respectively applying a voltage of 20kV-60kV and a high-frequency sinusoidal voltage with the frequency of 1kHz-20kHz by adopting a controlled variable method to determine the optimal test voltage and frequency.
Before the statistical analysis of the partial discharge signals, the method comprises the following steps: and judging whether external interference exists according to the amplitude and the direction of the partial discharge pulse signal, and if so, checking the surrounding environment of the epoxy insulation surface defect partial discharge multi-source information combined detection device until no external interference signal exists.
Performing statistical analysis on the partial discharge signal, including: the partial discharge detector utilizes an optical detection method as a partial discharge detection means of the epoxy insulation surface defects, simultaneously utilizes a pulse current distribution measurement method to identify external interference signals, and utilizes an ultrasonic method to locate the epoxy insulation surface defects if no external interference signals exist after identification.
The acquiring of the partial discharge signal of the epoxy insulation surface comprises the following steps: and determining a high-speed oscilloscope in which the high-voltage probe and the partial discharge detector are connected through a high-frequency coaxial cable, and acquiring partial discharge data with a period of 40min according to the high-speed oscilloscope.
According to another aspect of the present invention, there is also provided a GIS epoxy insulated surface defect partial discharge detection apparatus, the apparatus comprising:
the data acquisition unit is used for acquiring a partial discharge signal of the GIS epoxy insulation surface;
the data analysis unit is used for carrying out statistical analysis on the partial discharge signals and determining the optimal test voltage, frequency and test time of different insulation defect types of the epoxy resin;
and the data output unit is used for detecting the insulation defects of the epoxy resin according to the optimal test voltage, frequency and test time of different insulation defect types of the epoxy resin.
The data acquisition unit is specifically configured to include: and respectively applying a voltage of 20kV-60kV and a high-frequency sinusoidal voltage with the frequency of 1kHz-20kHz by adopting a controlled variable method to determine the optimal test voltage and frequency.
The data analysis unit is specifically configured to include: before the partial discharge signals are subjected to statistical analysis, whether external interference exists or not is judged according to the amplitude and the direction of the partial discharge pulse signals, and if the external interference exists, the surrounding environment of the epoxy insulation surface defect partial discharge multi-source information joint detection device is checked until no external interference signals exist.
The data analysis unit is specifically configured to include: the partial discharge detector utilizes an optical detection method as a partial discharge detection means of the epoxy insulation surface defects, simultaneously utilizes a pulse current distribution measurement method to identify external interference signals, and utilizes an ultrasonic method to locate the epoxy insulation surface defects if no external interference signals exist after identification.
The data acquisition unit is specifically configured to include: the acquiring of the partial discharge signal of the epoxy insulation surface comprises the following steps: and determining a high-speed oscilloscope in which the high-voltage probe and the partial discharge detector are connected through a high-frequency coaxial cable, and acquiring partial discharge data with a period of 40min according to the high-speed oscilloscope.
Technical effects
The invention has the beneficial effects that: by changing the voltage excitation of the partial discharge of the epoxy insulation surface defect, the high-frequency sinusoidal voltage has the following advantages:
(1) the residual charge effect can be stimulated, the partial discharge can be stimulated, and the problem that the epoxy resin is weak at the initial stage of the partial discharge can be solved;
(2) the frequency is multiplied, the partial discharge is more concentrated and violent, and the problem of long intermittent period of the epoxy resin is solved;
(3) the epoxy resin voltage mode sensitive problem is solved by having short-time impact effect and better repeatability and stability.
Under the excitation of high-frequency sinusoidal voltage, the detection and identification efficiency of the insulation defects on the surface of the epoxy resin is improved. In addition, the pulse current method is modified into a pulse current distribution measuring method, so that the external interference capability is reduced, the measuring sensitivity is improved, and the advantages of the three detection methods are comprehensively utilized, so that the multi-source information partial discharge detection device not only improves the detection and identification efficiency of the epoxy insulation surface defects, but also can perform fault location on the insulation surface defects.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
FIG. 1 is a GIS epoxy insulation surface defect partial discharge multi-source information joint detection device based on high-frequency voltage excitation;
FIG. 2 is a diagram of a multi-source information partial discharge detector according to the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
Since epoxy resin (EP) was discovered in 1909, it has been widely used as an important solid insulating material in various high and new electrical devices such as power machines, high voltage insulation switches, and converter transformer bushings due to its advantages of high mechanical strength, good thermal stability, easy curing, and superior insulating properties. Taking a Gas Insulated Switchgear (GIS) as an example, the basin-type insulator and the post-type insulator inside the gas insulated switchgear are made of epoxy resin. However, the epoxy resin insulation component is prone to surface defects due to factors such as complex manufacturing process, severe installation conditions, and susceptibility to electric-thermal-mechanical stress during operation. If surface defects are not detected at an early stage, continued development of these insulation defects will cause equipment failure. 256 faults of 35kV and above occur in China in the last decade, wherein 146 faults of epoxy resin insulation occur. Therefore, the effectiveness of the epoxy insulation surface defect detection technology has important significance for improving the safe and reliable operation of GIS equipment.
Usually, insulation faults are developed by some tiny defects, the defects can generate partial discharge in the GIS operation process, partial discharge signals contain rich equipment insulation state information, and latent insulation defects of the GIS can be effectively found through partial discharge live detection. However, various partial discharge detection means adopted at present have certain limitations, and especially (one) the recognition of the partial discharge amount of the submillimeter/millimeter-scale micro-metal particles on the surface of the insulator under the actual operation working condition is lacked; secondly, the existing detection device only aims at the discharge behavior with good repeatability, so that the intermittent discharge is ignored and missed, and finally the sudden breakdown and flashover of the GIS are caused; and thirdly, the anti-electromagnetic interference capability of the existing partial discharge online detection device is insufficient, and the requirement of an engineering field can not be met far away, so that the existing partial discharge online detection device has a large amount of false reports and missed reports.
In view of the above problems, the present invention provides a method and an apparatus for jointly detecting local discharge multi-source information of a GIS epoxy insulation surface defect based on high-frequency voltage excitation, as shown in fig. 1 and 2, and the present invention is further described with reference to the accompanying drawings.
It includes hardware configuration and software processing program; the hardware configuration comprises a high-frequency test voltage source 1, a protective resistor 2, a high-voltage probe 3, a high-speed oscilloscope 4, a signal processing computer 5, a partial discharge detector 6, a test cavity 7, a constant-temperature and constant-humidity box 8 and a high-frequency coaxial cable 9; the software processing program is a partial discharge data acquisition and processing system based on an LABVIEW visualization program; wherein, the high-frequency test voltage source 1 is respectively connected with the high-voltage probe 3 and the test cavity 7 through the protective resistor 2; the partial discharge detector 6 is arranged at the position of the test cavity 7, and the test cavity 7 is arranged inside the constant temperature and humidity box 8; the high-voltage probe 3 and the partial discharge detector 6 are connected with the high-speed oscilloscope 4 through the high-frequency coaxial cable 9 to transmit the partial discharge signal of the epoxy insulation surface defect; and the signal processing computer 5 is connected with the high-speed oscilloscope 4, and is used for acquiring, processing and analyzing the partial discharge signals of the insulation surface defects through a partial discharge data acquisition and processing system.
The high-frequency test voltage source 1 adopts continuous adjustable partial discharge high-frequency sinusoidal excitation voltage with the frequency of 1kHz-20kHz and the amplitude of 0-100 kV; the protective resistor 2 is formed by connecting a temperature protective tube and a piezoresistor in series; in order to accurately measure the variation range of the external applied voltage, a Tektronix P6015A model high-voltage probe 3 is selected; because the rising rate of the high-frequency sinusoidal voltage is faster, and the discharge duration is shorter, in order to obtain higher discharge pulse resolution, the oscilloscope selects a high digital indicator 4 with the highest sampling rate of 10GS/s, the sampling bandwidth of 1.5GHz and the model of YOKOGAWADL 6154; the signal processing computer 5 is loaded with a partial discharge data acquisition and processing system based on an LABVIEW visualization program, and acquires, processes, stores and analyzes the partial discharge signal data of the epoxy insulation surface defect; the partial discharge detector 6 establishes a multi-source information joint detection device which takes a pulse current distribution method, an ultrasonic method and an optical detection method as an insulation defect detection means, and utilizes a pulse current distribution measurement method to identify external interference signals; positioning the epoxy insulation surface defects by an ultrasonic method; an optical detection method is used as a main detection means for the partial discharge of the defects on the surface of the epoxy insulation, and a pulse current distribution measurement method and an ultrasonic method are used as auxiliary means for the partial discharge detection of the insulation defects, so that the detection and identification efficiency of the defects on the surface of the epoxy insulation is further improved; the test cavity 7 selects a scaling model of an actual GIS to simulate a real GIS operation environment as much as possible, and the obtained partial discharge characteristic library of the epoxy insulation surface defects can more accurately represent insulation defects of different types of epoxy resin. The constant temperature and humidity box 8 is used for providing a stable external environment and reducing the external interference of the partial discharge multi-source information combined detection device; the high-frequency coaxial cable 9 adopts a coaxial cable with characteristic impedance of 50 omega and frequency band of 0-3GHz, and aims to connect a high-speed oscilloscope with a signal processing computer to collect and process partial discharge signals.
The following describes a specific embodiment of the GIS epoxy insulated surface defect partial discharge multi-source information joint detection device based on high-frequency voltage excitation by using an example.
(1) Opening the constant temperature and humidity box 8, setting the temperature to be 20 ℃ and the humidity to be 40%;
(2) the tested insulator 14 selects an epoxy insulator A and a normal insulator B with 5mm metal particle defects, and the epoxy insulator A and the normal insulator B are arranged in the test cavity 7;
(3) vacuumizing the test cavity 7, filling 0.6MPa SF6 gas into the test cavity, and applying 30kV high-frequency sinusoidal voltage to the test cavity 7;
(4) observing the amplitude and direction of each insulator partial discharge pulse signal in the high-speed oscilloscope 4, judging whether external interference exists, and if so, checking the surrounding environment of the epoxy insulation surface defect partial discharge multi-source information combined detection device until no obvious external interference signal exists;
(5) respectively applying high-frequency sinusoidal voltages with different voltages (20kV-60kV) and different frequencies (1kHz-20kHz) by a controlled variable method to detect the partial discharge of the epoxy insulation surface defects;
(6) the generated epoxy insulation partial discharge signal is transmitted to a high-speed oscillograph 4 through a high-frequency coaxial cable 9, and a signal processing computer 5 acquires partial discharge data for 40min through a partial discharge data acquisition and processing system based on an LABVIEW visualization program;
(7) the method comprises the steps of carrying out data processing on collected partial discharge data by using a partial discharge data collecting and processing system based on an LABVIEW visualization program, obtaining partial discharge information such as a discharge amplitude value, a discharge phase, a discharge frequency and the like, storing the partial discharge information into a partial discharge database to form partial discharge signal historical data, carrying out statistical analysis on the partial discharge signal historical data in the partial discharge database through data analysis, determining optimal test voltage, frequency and test time of different insulation defect types of epoxy resin, extracting characteristic parameters, and forming a GIS epoxy insulation surface defect partial discharge characteristic library based on high-frequency voltage excitation.
A GIS epoxy insulation surface defect partial discharge multi-source information joint detection method comprises the following steps:
acquiring a partial discharge signal of the epoxy insulation surface;
performing statistical analysis on the partial discharge signals to determine the optimal test voltage, frequency and test time of different insulation defect types of the epoxy resin;
and detecting the insulation defects of the epoxy resin according to the optimal test voltage, frequency and test time of the epoxy resin with different insulation defect types.
Detecting the insulation defect of the epoxy resin according to the optimal test voltage, frequency and test time of different insulation defect types of the epoxy resin, and the method comprises the following steps: and respectively applying a voltage of 20kV-60kV and a high-frequency sinusoidal voltage with the frequency of 1kHz-20kHz by adopting a controlled variable method to determine the optimal test voltage and frequency.
Before the statistical analysis of the partial discharge signals, the method comprises the following steps: and judging whether external interference exists according to the amplitude and the direction of the partial discharge pulse signal, and if so, checking the surrounding environment of the epoxy insulation surface defect partial discharge multi-source information combined detection device until no external interference signal exists.
Performing statistical analysis on the partial discharge signal, including: the partial discharge detector utilizes an optical detection method as a partial discharge detection means of the epoxy insulation surface defects, simultaneously utilizes a pulse current distribution measurement method to identify external interference signals, and utilizes an ultrasonic method to locate the epoxy insulation surface defects if no external interference signals exist after identification.
The acquiring of the partial discharge signal of the epoxy insulation surface comprises the following steps: and determining a high-speed oscilloscope in which the high-voltage probe and the partial discharge detector are connected through a high-frequency coaxial cable, and acquiring partial discharge data with a period of 40min according to the high-speed oscilloscope.
According to another aspect of the present invention, there is also provided a GIS epoxy insulated surface defect partial discharge detection apparatus, the apparatus comprising:
the data acquisition unit is used for acquiring a partial discharge signal of the GIS epoxy insulation surface;
the data analysis unit is used for carrying out statistical analysis on the partial discharge signals and determining the optimal test voltage, frequency and test time of different insulation defect types of the epoxy resin;
and the data output unit is used for detecting the insulation defects of the epoxy resin according to the optimal test voltage, frequency and test time of different insulation defect types of the epoxy resin.
The data acquisition unit is specifically configured to include: and respectively applying a voltage of 20kV-60kV and a high-frequency sinusoidal voltage with the frequency of 1kHz-20kHz by adopting a controlled variable method to determine the optimal test voltage and frequency.
The data analysis unit is specifically configured to include: before the partial discharge signals are subjected to statistical analysis, whether external interference exists or not is judged according to the amplitude and the direction of the partial discharge pulse signals, and if the external interference exists, the surrounding environment of the epoxy insulation surface defect partial discharge multi-source information joint detection device is checked until no external interference signals exist.
The data analysis unit is specifically configured to include: the partial discharge detector utilizes an optical detection method as a partial discharge detection means of the epoxy insulation surface defects, simultaneously utilizes a pulse current distribution measurement method to identify external interference signals, and utilizes an ultrasonic method to locate the epoxy insulation surface defects if no external interference signals exist after identification.
The data acquisition unit is specifically configured to include: the acquiring of the partial discharge signal of the epoxy insulation surface comprises the following steps: and determining a high-speed oscilloscope in which the high-voltage probe and the partial discharge detector are connected through a high-frequency coaxial cable, and acquiring partial discharge data with a period of 40min according to the high-speed oscilloscope.
Technical effects
The invention has the beneficial effects that: by changing the voltage excitation of the partial discharge of the epoxy insulation surface defect, the high-frequency sinusoidal voltage has the following advantages: the residual charge effect can be stimulated, the partial discharge can be stimulated, and the problem that the epoxy resin is weak at the initial stage of the partial discharge can be solved; the frequency is multiplied, the partial discharge is more concentrated and violent, and the problem of long intermittent period of the epoxy resin is solved; the epoxy resin voltage mode sensitive problem is solved by having short-time impact effect and better repeatability and stability.
Under the excitation of high-frequency sinusoidal voltage, the detection and identification efficiency of the insulation defects on the surface of the epoxy resin is improved. In addition, the pulse current method is modified into a pulse current distribution measuring method, so that the external interference capability is reduced, the measuring sensitivity is improved, and the advantages of the three detection methods are comprehensively utilized, so that the multi-source information partial discharge detection device not only improves the detection and identification efficiency of the epoxy insulation surface defects, but also can perform fault location on the insulation surface defects.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (10)
1. A GIS epoxy insulation surface defect partial discharge detection method is characterized by comprising the following steps:
acquiring a partial discharge signal of the epoxy insulation surface;
performing statistical analysis on the partial discharge signals to determine the optimal test voltage, frequency and test time of different insulation defect types of the epoxy resin;
and detecting the insulation defects of the epoxy resin according to the optimal test voltage, frequency and test time of the epoxy resin with different insulation defect types.
2. The method of claim 1, wherein detecting the insulation defect of the epoxy resin according to the optimal test voltage, frequency and test time of different insulation defect types of the epoxy resin comprises: and respectively applying a voltage of 20kV-60kV and a high-frequency sinusoidal voltage with the frequency of 1kHz-20kHz by adopting a controlled variable method to determine the optimal test voltage and frequency.
3. The method of claim 1, wherein prior to performing the statistical analysis of the partial discharge signal, comprising: and judging whether external interference exists according to the amplitude and the direction of the partial discharge pulse signal, and if so, checking the surrounding environment of the epoxy insulation surface defect partial discharge multi-source information combined detection device until no external interference signal exists.
4. The method of claim 1, wherein performing a statistical analysis of the partial discharge signal comprises: the partial discharge detector utilizes an optical detection method as a partial discharge detection means of the epoxy insulation surface defects, simultaneously utilizes a pulse current distribution measurement method to identify external interference signals, and utilizes an ultrasonic method to locate the epoxy insulation surface defects if no external interference signals exist after identification.
5. The method of claim 1, wherein the obtaining a partial discharge signal of an epoxy insulated surface comprises: and determining a high-speed oscilloscope in which the high-voltage probe and the partial discharge detector are connected through a high-frequency coaxial cable, and acquiring partial discharge data with a period of 40min according to the high-speed oscilloscope.
6. A GIS epoxy insulation surface defect partial discharge multi-source information joint detection device is characterized by comprising:
the data acquisition unit is used for acquiring a partial discharge signal of the GIS epoxy insulation surface;
the data analysis unit is used for carrying out statistical analysis on the partial discharge signals and determining the optimal test voltage, frequency and test time of different insulation defect types of the epoxy resin;
and the data output unit is used for detecting the insulation defects of the epoxy resin according to the optimal test voltage, frequency and test time of different insulation defect types of the epoxy resin.
7. The apparatus of claim 6, wherein the data acquisition unit is specifically configured to include: and respectively applying a voltage of 20kV-60kV and a high-frequency sinusoidal voltage with the frequency of 1kHz-20kHz by adopting a controlled variable method to determine the optimal test voltage and frequency.
8. The apparatus of claim 6, wherein the data analysis unit is specifically configured to include: before the partial discharge signals are subjected to statistical analysis, whether external interference exists or not is judged according to the amplitude and the direction of the partial discharge pulse signals, and if the external interference exists, the surrounding environment of the epoxy insulation surface defect partial discharge multi-source information joint detection device is checked until no external interference signals exist.
9. The apparatus of claim 6, wherein the data analysis unit is specifically configured to include: the partial discharge detector uses an optical detection method as a partial discharge detection means for the epoxy insulation surface defects, simultaneously uses a pulse current distribution measurement method to identify external interference signals, and uses an ultrasonic method to locate the epoxy insulation surface defects if no external interference signals exist after identification。
10. The apparatus of claim 6, wherein the data acquisition unit is specifically configured to include: the acquiring of the partial discharge signal of the epoxy insulation surface comprises the following steps: and determining a high-speed oscilloscope in which the high-voltage probe and the partial discharge detector are connected through a high-frequency coaxial cable, and acquiring partial discharge data with a period of 40min according to the high-speed oscilloscope.
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Application publication date: 20210831 |