CN102508124B - Detection method of partial discharge of electrical equipment - Google Patents
Detection method of partial discharge of electrical equipment Download PDFInfo
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- CN102508124B CN102508124B CN 201110315193 CN201110315193A CN102508124B CN 102508124 B CN102508124 B CN 102508124B CN 201110315193 CN201110315193 CN 201110315193 CN 201110315193 A CN201110315193 A CN 201110315193A CN 102508124 B CN102508124 B CN 102508124B
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Abstract
The invention relates to a detection method partial discharge of electrical equipment and a device thereof. The detection method comprises the following steps of: erecting a measuring antenna in the position which is 20-30m away from the equipment to be detected, measuring an electromagnetic wave electric field component radiated from the electrical equipment, transmitting the measured signal waveform of the electromagnetic wave electric field component into a digital storage oscilloscope for storage, transmitting the signal waveform from the digital storage oscilloscope to a computer via a communication cable, performing Fourier decomposition on the signal waveform by application software of the computer to get a frequency spectrum characteristic curve of radiated electromagnetic waves, and performing contrastive analysis on the frequency spectrum characteristic curve according to the corresponding relation between a 1GHz-3GHz ultra-high frequency component and the partial discharge characteristic of the electrical equipment so as to identify and evaluate the partial discharge characteristic of the detected electrical equipment. The detection method has the following advantages: 1-3GHz ultra-high frequency signals of the radiated electromagnetic waves generated by the partial discharge are measured through an ultra-high frequency detection method, so that the detection is less affected by external interference signals, and reliability and sensitivity in detection of the partial discharge can be greatly improved.
Description
Technical field
The present invention relates to a kind of detection method for local discharge, especially relate to a kind of detection method of partial discharge of electrical equipment.
Background technology
At present, the detection of local discharge of electrical equipment characteristic and assessment can be divided into non-electrical measuring method and the large class of electrical measuring method two by detected physical quantity character.
Non-electrical measuring method detects the non-electrical phenomenas such as newly-generated thing of the ultrasound wave produced in the shelf depreciation process, the light sent, heat and appearance and identifies local discharge of electrical equipment; Electrical measuring method detects electric pulse, the electromagnetic radiation produced in the shelf depreciation process, and the transfer of electric charge and the electrical phenomenas such as loss of electric energy are identified local discharge of electrical equipment.No matter be that non-electrical measuring method or electrical measuring method all also exist all deficiencies, as simple as the pulse current method measuring method that is most widely used in electrical measuring method, highly sensitive, be easy to shelf depreciation quantitative, but generally at tens of kHz～tens of MHz, be subject to the impact of various electromagnetic interference (EMI) because of the frequency of its detection signal.Ultrahigh frequency UHF detection method 1～3GHz in uhf-range extracts the ultra-high frequency signal that shelf depreciation produces, thereby it is little affected by external interference, can greatly improve reliability and the sensitivity of Partial Discharge Detection, but still have a lot of problems to wait to solve, as there are the shortcomings such as accuracy rate is low, installation and maintenance are difficult in currently used contact as ultrahigh frequency detection methods such as built-in sensors.
Summary of the invention
The present invention solves the existing technical matters of prior art; A kind of radiated electromagnetic wave 1～3GHz ultra-high frequency signal that adopts the ultrahigh frequency detection method to measure local discharge generation is provided, be subject to the external interference effect of signals little, can greatly improve the reliability of Partial Discharge Detection and a kind of detection method of partial discharge of electrical equipment of sensitivity.
It is to solve the existing technical matters of prior art that the present invention also has a purpose; Provide a kind of contactless ultrahigh frequency detection method of external antenna that adopts can overcome the shortcomings such as contact measurement method installation and maintenance difficulty, can be widely used in the on-line monitoring of various electrical equipments or a kind of detection method of partial discharge of electrical equipment of off-line fast inspection.
It is to solve the existing technical matters of prior art that the present invention has a purpose again; Provide that a kind of contactless ultrahigh frequency detection method that adopts external antenna can be used for sending out, the shelf depreciation fast detecting in transformer station under the electrical equipment no cut-off condition, during measurement without any wiring, just can realize the fast detecting to local discharge of electrical equipment in whole, transformer station, can greatly improve a kind of detection method of partial discharge of electrical equipment of the utilization ratio of measuring equipment.
Above-mentioned technical matters of the present invention is mainly solved by following technical proposals:
A kind of detection method of partial discharge of electrical equipment, is characterized in that, comprises the following steps:
At above-mentioned a kind of detection method of partial discharge of electrical equipment, in described step 4, the concrete operation method that obtains the actual spectrum characteristic curve is as follows:
Step 4.1, setting up the measurement antenna from electrical equipment to be measured 20 places, measures the electromagnetic wave electric field component signal waveform that electrical equipment to be measured radiates, and measured electromagnetic wave electric field component signal waveform is imported the digital storage oscilloscope storage into through concentric cable;
Step 4.2, the digital storage oscilloscope electromagnetic wave electric field component signal waveform that step 4.1 is measured is imported computing machine into through communication cable, computer application software obtains corresponding frequency component to this electromagnetic wave electric field component signal waveform as Fourier decomposition, thereby obtains the actual spectrum characteristic curve of on-site electrical equipment radiated electromagnetic wave;
Step 4.3, the actual spectrum characteristic curve of the on-site electrical equipment radiated electromagnetic wave that comparison step 4.2 obtains, as the radiation field intensity component recorded in its 1～3GHz UHF band > 0.1V/m, shelf depreciation has occurred in determining apparatus, otherwise shelf depreciation does not occur.
At above-mentioned a kind of detection method of partial discharge of electrical equipment, in described step 1.1, need to measure the shelf depreciation current waveform under different discharge types, described different discharge types are respectively: pin-plate electric discharge, bubble-discharge, oil wedge discharge, surface-discharge, suspended discharge, the electric discharge of inner oil clearance.
At above-mentioned a kind of detection method of partial discharge of electrical equipment, in step 2, while obtaining local discharge of electrical equipment, the characteristic method of typical frequency spectrum of radiated electromagnetic wave is specially: adopt the FEKO of electromagnetic field analysis simulation software to set up model, Fourier decomposition result according to the shelf depreciation electric current, in the frequency band range of 0～3GHz, take 100MHz as interval, get successively the different frequency current weight and carry out simulation calculation as the feed of Simulation Calculation, ask for the radiated electromagnetic wave electric field component of each respective frequencies point, adopt again Matlab software to carry out matching to these calculated values, the spectral characteristic curve of radiated electromagnetic wave while obtaining local discharge of electrical equipment.
At above-mentioned a kind of on-site electrical equipment detection method for local discharge, in described step 3, the radiated electromagnetic wave high fdrequency component is 1GHz～3GHz ultrahigh frequency component.
A kind of device that uses detection method of partial discharge of electrical equipment, it is characterized in that, comprise the measurement antenna for measuring electrical equipment electromagnetic wave electric field component signal waveform to be measured, the digital storage oscilloscope be connected with the measurement antenna by concentric cable, the analysis personal computer be connected with digital storage oscilloscope by communication cable.
Therefore, the present invention has following advantage: 1. adopt the ultrahigh frequency detection method to measure the radiated electromagnetic wave 1-3GHz ultra-high frequency signal of local discharge generation, be subject to the external interference effect of signals little, can greatly improve reliability and the sensitivity of Partial Discharge Detection; 2. adopt the contactless ultrahigh frequency detection method of external antenna can overcome the shortcomings such as contact measurement method installation and maintenance difficulty, can be widely used in on-line monitoring or the off-line fast inspection of various electrical equipments; 3. adopt that the contactless ultrahigh frequency detection method of external antenna can be used for sending out, the shelf depreciation fast detecting in transformer station under the electrical equipment no cut-off condition, during measurement without any wiring, just can realize the fast detecting to local discharge of electrical equipment in whole, transformer station, can greatly improve the utilization ratio of measuring equipment.
The accompanying drawing explanation
The typical frequency spectrum characteristic curve diagram of Fig. 1 local discharge of electrical equipment electric current that to be the present invention obtain through Fourier decomposition according to analog reslt.
Fig. 2 is the Fourier decomposition result of the present invention with the shelf depreciation electric current, gets the feed of different frequency current weight as Simulation Calculation, the typical frequency spectrum family curve of radiated electromagnetic wave during the local discharge of electrical equipment that carries out the simulation calculation acquisition.
Fig. 3 is a kind of workflow diagram of the present invention.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, technical scheme of the present invention is described in further detail.
Embodiment:
A kind of detection method of partial discharge of electrical equipment comprises the following steps:
Step 1.1, shunt is serially connected in the test model discharge loop, the shunt output terminal is connected with digital storage oscilloscope through concentric cable, the current waveform produced while measuring the test model electric discharge, and measured current signal waveform is imported the digital storage oscilloscope storage into through concentric cable;
Step 1.2, adopt Matlab software that the current signal waveform in digital storage oscilloscope is made to Fourier decomposition, obtains the typical frequency spectrum characteristic curve of local discharge of electrical equipment electric current;
Step 4.1, setting up measurement antenna (2) from electrical equipment to be measured (1) 20-30m place, measure the electromagnetic wave electric field component signal waveform that electrical equipment to be measured (1) radiates, measured electromagnetic wave electric field component signal waveform is imported digital storage oscilloscope storage (3) into through concentric cable (5);
Step 4.2, digital storage oscilloscope (3) the electromagnetic wave electric field component signal waveform that step 1 is measured is imported computing machine (4) into through communication cable (6), computing machine (4) application software is obtained corresponding frequency component to this electromagnetic wave electric field component signal waveform as Fourier decomposition, thereby obtains the typical frequency spectrum characteristic curve of radiated electromagnetic wave;
Step 4.3, the actual spectrum characteristic curve of the on-site electrical equipment radiated electromagnetic wave that comparison step 4.2 obtains, as the radiation field intensity component recorded in its 1～3GHz UHF band > 0.1V/m, shelf depreciation has occurred in determining apparatus, otherwise shelf depreciation does not occur.
In the present embodiment, the device of applying top detection method of partial discharge of electrical equipment comprises: comprise measurement antenna 2 for measuring electrical equipment 1 electromagnetic wave electric field component signal waveform to be measured, by concentric cable 5 with measure digital storage oscilloscope 3 that antenna 2 is connected, pass through the computing machine 4 that communication cable 6 is connected with digital storage oscilloscope 3.
Specific embodiment described herein is only to the explanation for example of the present invention's spirit.Those skilled in the art can make various modifications or supplement or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present invention or surmount the defined scope of appended claims.
Although this paper has more been used electrical equipment 1 to be measured, measured the terms such as antenna 2, digital storage oscilloscope 3, computing machine 4, concentric cable 5, communication cable 6, do not get rid of the possibility of using other term.Using these terms is only in order to describe more easily and explain essence of the present utility model; They are construed to any additional restriction is all contrary with the utility model spirit.
Claims (4)
1. a detection method of partial discharge of electrical equipment, is characterized in that, comprises the following steps:
Step 1, model test step: set up the partial discharge test model and carry out model test, adopt digital storage oscilloscope to measure the shelf depreciation current waveform under different discharge types through shunt, adopt again Matlab software that this current waveform is made to Fourier transform, obtain the typical frequency spectrum characteristic curve of local discharge of electrical equipment electric current;
Step 2, emulation experiment step: different electrical equipments are set up to cad model, carry out simulation calculation, the typical frequency spectrum family curve of radiated electromagnetic wave while obtaining local discharge of electrical equipment according to the different frequency current weight in the Fourier decomposition result of getting model test of partial discharge in step 1 and record electric current as the feed of Simulation Calculation;
Step 3, determined the corresponding relation between the Characteristics of Partial Discharge of radiated electromagnetic wave 1～3GHz ultrahigh frequency component and electrical equipment by step 2 simulation result: when electrical equipment generation shelf depreciation, from Devices to test 20m place, in 1～3GHz UHF band, can record the radiation field intensity of 0.1V/m; When electrical equipment shelf depreciation does not occur, from Devices to test 20m place, in 1～3GHz UHF band, the radiation field intensity recorded is zero;
Step 4, on-site measurement method step: from on-the-spot Devices to test 20m place, setting up the measurement antenna, the electromagnetic wave electric field component that the measure field electrical equipment radiates, measured electromagnetic wave electric field component signal waveform is imported the digital storage oscilloscope storage into through concentric cable, digital storage oscilloscope imports this signal waveform into computing machine through communication cable, computing machine is made Fourier decomposition to this signal waveform, obtain the actual spectrum family curve of measure field electrical equipment radiated electromagnetic wave, the radiation field intensity recorded in corresponding relation comparison 1～3GHz UHF band by step 3 again, determine whether Devices to test produces shelf depreciation.
2. a kind of detection method of partial discharge of electrical equipment according to claim 1, is characterized in that, in described step 4, obtains the characteristic concrete operation method of actual spectrum as follows:
Step 4.1, setting up measurement antenna (2) from electrical equipment to be measured (1) 20-30m place, measure the electromagnetic wave electric field component signal waveform that electrical equipment to be measured (1) radiates, measured electromagnetic wave electric field component signal waveform is imported digital storage oscilloscope storage (3) into through concentric cable (5);
Step 4.2, digital storage oscilloscope (3) the electromagnetic wave electric field component signal waveform that step 4.1 is measured is imported computing machine (4) into through communication cable (6), computing machine (4) application software is obtained corresponding frequency component to this electromagnetic wave electric field component signal waveform as Fourier decomposition, thereby obtains the actual spectrum family curve of radiated electromagnetic wave;
Step 4.3, the actual spectrum characteristic curve of the on-site electrical equipment radiated electromagnetic wave that comparison step 4.2 obtains, as the radiation field intensity component recorded in its 1～3GHz UHF band > 0.1V/m, shelf depreciation has occurred in determining apparatus, otherwise shelf depreciation does not occur.
3. a kind of detection method of partial discharge of electrical equipment according to claim 2, it is characterized in that, in described step 1, need to measure the shelf depreciation current waveform under different discharge types, described different discharge types are respectively: pin-plate electric discharge, bubble-discharge, oil wedge discharge, surface-discharge, suspended discharge, the electric discharge of inner oil clearance.
4. a kind of detection method of partial discharge of electrical equipment according to claim 1, it is characterized in that, in step 2, while obtaining local discharge of electrical equipment, the characteristic method of typical frequency spectrum of radiated electromagnetic wave is specially: adopt the FEKO of electromagnetic field analysis simulation software to set up model, Fourier decomposition result according to model test shelf depreciation electric current, in the frequency band range of 0～3GHz, take 100MHz as interval, get successively the different frequency current weight and carry out simulation calculation as the feed of Simulation Calculation, ask for the radiated electromagnetic wave electric field component of each respective frequencies point, adopt again Matlab software to carry out matching to these calculated values, the spectral characteristic curve of radiated electromagnetic wave while obtaining local discharge of electrical equipment.
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| CN103353847A (en) * | 2012-12-24 | 2013-10-16 | 国家电网公司 | Simulation device for electrical equipment discharge detection based on virtual realization and realization method thereof |
| CN105334435B (en) * | 2015-10-23 | 2018-04-13 | 国网山东海阳市供电公司 | A kind of adaptive local electric discharge ultrasonic monitoring method based on arbitrary arrays |
| CN107515364A (en) * | 2017-08-24 | 2017-12-26 | 华北电力大学 | A kind of radio interference time domain measurement device and method based on conductor corona electric discharge |
| CN111025099B (en) * | 2019-12-05 | 2022-03-22 | 国网宁夏电力有限公司电力科学研究院 | Simulation model and method for partial discharge detection |
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| WO2007063647A1 (en) * | 2005-11-29 | 2007-06-07 | Kyushu Institute Of Technology | Partial discharge charge quantity measuring method and device |
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| CN101551434A (en) * | 2009-05-13 | 2009-10-07 | 中南大学 | Transformer partial discharge positioning method base on ultra high frequency detection technology |
| CN101620253A (en) * | 2009-07-24 | 2010-01-06 | 重庆大学 | Ultra-high frequency positioning and detection device of local discharge of electrical equipment and method thereof |
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