CN101655536A - Method for detecting partial discharge of gas insulated switchgear - Google Patents
Method for detecting partial discharge of gas insulated switchgear Download PDFInfo
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Abstract
The invention provides a method for detecting partial discharge of a gas insulated switchgear (GIS). The method is a comprehensive detecting method combining ultra-high frequency detection and acoustic emission detection to monitor and position the partial discharge in the GIS. The method for detecting the partial discharge of the GIS is more effective in the monitoring of the partial discharge ofthe GIS, and is more scientific and favorable for the scientific research of the partial discharge of the GIS because the acquired ultra-high frequency characteristic data and acoustic emission characteristic data can be compared and analyzed mutually; and after the initial positioning of the ultra-high frequency characteristic data, acoustic emission detection positioning is performed in a smallrange of discharge area, so the problem of low efficiency of the acoustic emission detection is solved, the positioning is more accurate and effective, and the accurate position of a discharge pointcan be discovered more quickly.
Description
Technical field
The present invention relates to a kind of discharge detection method, particularly a kind of method for detecting partial discharge of gas insulated switchgear.
Background technology
Gas insulated combined electrical equipment (Gas Insulated Switchgear, below summary is for GIS) is because characteristics such as its insulativity height, compact conformation, floor area are little, unfailing performance height, is used widely in the generating plant of electric system and transformer station.But in use can run into some problems, wherein based on Insulation Problems.
GIS introduces defective easily in manufacturing and installation process,, metal tip too high as dust, electrically conductive particles, stress, interior dress are loosening etc., and along with the increase of the GIS operation time limit, defective can develop seriously gradually, under extraneous inducements such as superpotential or operating process, will cause puncture or flashover phenomenon.These insulation faults take place before, normal phenomenon with shelf depreciation.The appearance of shelf depreciation often illustrates that there is the defective of installation, manufacturing even design aspect in GIS.
Above-mentioned partial discharge phenomenon can excite the electromagnetic wave that reaches thousands of megahertzes (GHz), the inner shelf depreciation sustainable development of GIS causes Fault of Insulating Breakdown easily, thereby power outage appears, and cause damage to national economy, just seem particularly important so the shelf depreciation of GIS monitored and locate.
The detection method for local discharge of existing GIS, as the Chinese patent notification number 100363747 " gas insulation combined electric device local discharge superhigh frequency detection apparatus and method ", disclose and a kind ofly utilized method that ultrahigh frequency detects that the discharge of GIS part is detected, though avoided the interference of corona discharge in the air, the detection efficiency height, but the requirement to antenna performance and data sampling rate is very high, and degree of accuracy is not very high, in addition, this method only relies on the detection method of ultrahigh frequency that shelf depreciation is monitored, and comparatively accurate localization is not carried out in the position of shelf depreciation.
And for example the Chinese patent notification number is 100363748 " online detection and location device of local discharge of gas-insulator switchgear and localization method ", though disclose localization method to the GIS shelf depreciation, but its method that still only relies on ultrahigh frequency to detect positions, and locatees accurate inadequately.And no matter above-mentioned patent and related art all exist the location accurate inadequately in varying degrees, obtain the accurate inadequately too drawback of characteristic of discharge signal, thus influence maintenance and the science analyzed.
In addition, also can utilize acoustic emission (Acoustic Emission, below summary is AE), be also referred to as the stress wave emission sometimes, it often is applied in the detection to aspects such as the structural deformation of material and crack propagation.But,, can make that again detection efficiency is low, and influenced by the GIS proper vibration if utilize acoustic emission that the GIS shelf depreciation is detected.
In view of this, how to provide a kind of method for detecting partial discharge of gas insulated switchgear, reduce above-mentioned drawback and become the technical matters that industry needs to be resolved hurrily.
Summary of the invention
Technical matters solved by the invention is to provide a kind of method for detecting partial discharge of gas insulated switchgear, to improve detection efficiency, obtains characteristic accurately, improves locating speed and accuracy.
For solving the problems of the technologies described above, the invention provides a kind of gas insulated combined electrical equipment (GIS) detection method for local discharge, it may further comprise the steps: at first in described gas insulated combined electrical equipment relevant position uhf sensor is set, the ultra-high frequency signal that described uhf sensor is monitored carries out spectrum analysis, determines to detect frequency band after the overfrequency examination; Then the ultra-high frequency signal in the described detection frequency band being carried out single-frequency follows the tracks of; When appearance is unusual in the single-frequency tracing process, measures the relevant ultrahigh frequency characteristic that unusual ultra-high frequency signal occurs, and carry out Primary Location, determine a region of discharge according to the ultrahigh frequency characteristic; In described region of discharge, calibrate AE sensor is set then, and acoustic emission signal is monitored; Measure the relevant characteristics of Acoustic Emission data that monitor acoustic emission signal, the location of finishing point of discharge according to the characteristics of Acoustic Emission data at last.
Described GIS detection method for local discharge also is included in and carries out before single-frequency is followed the tracks of the gas componant in the described GIS being detected and analyzing, and disturbs to help getting rid of, and determines to detect frequency band.
Described GIS detection method for local discharge also comprises: if do not occur unusual in the single-frequency tracing process, acoustic emission detection point then is set and carries out acoustic emission detection, transfer acoustic emission signal to sub-audible sound, if sub-audible sound occurs unusual, then measure the relevant characteristics of Acoustic Emission data monitor acoustic emission signal, finish location point of discharge according to the characteristics of Acoustic Emission data.
Described GIS detection method for local discharge also comprises: behind the location of finishing point of discharge, comprehensively compare and analyze in conjunction with relevant ultrahigh frequency characteristic and characteristics of Acoustic Emission data, and set up the coherent detection database.
Carry out acoustic emission signal when monitoring coming examination signal point of maximum intensity by the position of mobile calibrate AE sensor, and the signal point of maximum intensity being measured above-mentioned.And when the relevant ultrahigh frequency characteristic of unusual ultra-high frequency signal measure occurring, also comprise the situation of measuring applied voltage.
Wherein, it is the ultra-high frequency signal of selecting single-frequency that described single-frequency is followed the tracks of, and the amplitude of its signal is carried out Continuous Tracking; Described uhf sensor is to be located at the discontinuous place of described gas insulated combined electrical equipment outer cover metal body.
In addition, carrying out Primary Location is mistiming according to time domain waveform in the ultrahigh frequency characteristic; And be the sound intensity according to each calibrate AE sensor position in the characteristics of Acoustic Emission data to the location of point of discharge.
Method for detecting partial discharge of gas insulated switchgear of the present invention, it is the method for comprehensive detection that detects the kneading acoustic emission detection by ultrahigh frequency, shelf depreciation in the GIS is monitored and located, wherein, carrying out the ultrahigh frequency detection method earlier monitors local discharge signal, and when monitoring discharge signal, it is carried out the measurement of ultrahigh frequency characteristic, and then Primary Location, determine a region of discharge; Subsequently, utilize the acoustic emission detection method in above-mentioned region of discharge, to detect, thereby obtain characteristics of Acoustic Emission data and final determining point of discharge.Said method is not only more effective to the GIS partial discharge monitoring, and the ultrahigh frequency characteristic that obtains and characteristics of Acoustic Emission data compare of analysis mutually, so have more science, helps the scientific research to the GIS shelf depreciation; And after the Primary Location through the ultrahigh frequency characteristic, in the less region of discharge of scope, carry out the acoustic emission detection location, not only efficiently solve the inefficient problem of acoustic emission detection, and make the location more accurately effectively, exact position that can also faster discovery point of discharge.
Description of drawings
Fig. 1 is the schematic flow sheet of the method for detecting partial discharge of gas insulated switchgear of a preferred embodiment of the present invention.
Embodiment
Below by preferable instantiation explanation embodiments of the present invention, those skilled in the art can understand other advantages of the present invention and effect easily by the content that this instructions disclosed.The present invention also can be implemented or used by other different instantiations, and the every details in this instructions also can be based on different viewpoints and application, carries out various modifications and change under the spirit of the present invention not deviating from.
Gas insulated combined electrical equipment described in the present invention (Gas Insulated Switchgear, below summary is GIS) detection method for local discharge can be applicable to the generating plant of electric system and the inner partial discharge monitoring of GIS, location and the research of transformer station.
Referring to Fig. 1, the method for detecting partial discharge of gas insulated switchgear flow process of a preferred embodiment of the present invention may further comprise the steps:
At first, execution in step S11, in described gas insulated combined electrical equipment relevant position uhf sensor is set, the ultra-high frequency signal that described uhf sensor is monitored carries out spectrum analysis, after the overfrequency examination, determine to detect frequency band, need to prove, in principle, described uhf sensor can be located at the discontinuous place of described GIS outer cover metal body, in present embodiment, for example be arranged at the no metal flange disc insulator among the GIS, the insulator plug hole, positions such as grounding switch place insulator, and the uhf sensor of selecting for use is an external, the detection frequency is 300MHz to 1.1GHz, and the shell of uhf sensor wherein five faces all has metallic shield, and only one side does not shield with directional couple uhf electromagnetic wave signal.
In addition, in present embodiment, carrying out spectrum analysis is to be realized by the corresponding frequency spectrum analyser, start the full frequency band scanning of spectrum analyzer, can measure all background scene frequencies that monitor by uhf sensor, help to get rid of the erroneous judgement that produces because of background interference, get rid of electromagnetic interference (EMI).And for detect frequency band determine note also: for the ultrahigh frequency in-vivo measurement, frequency band is selected to depend primarily on the GIS cylinder internal diameter, is example with 110kV GIS, and general pipe diameter is 30cm, and detecting lower-frequency limit needs greater than 300MHz.For the ultrahigh frequency in-vitro measurements, owing to can only on maskless insulator basin, measure, the thickness of insulator basin has determined the frequency band selection, also need consider the frequency band of external interference simultaneously, consider from anti-interference and sensitivity two aspects, when adopting in-vitro measurements, common extraneous background interference is in 250～750MHz scope.Therefore the frequency band range of uhf sensor should be chosen between 700～1300MHz when in vitro method is measured.Consider frequency selectivity and anti-interference factor, high-end frequency also should be higher, so survey frequency can be selected between 700～1500MHz.
In step S12, the gas componant in the described GIS is detected and analyzes in addition, help equally to get rid of and disturb, determine to detect frequency band.
Then, carry out step S13, be to determining that according to step S11 and step S12 the ultra-high frequency signal in the detection frequency band carries out the single-frequency tracking, it is the ultra-high frequency signal of selecting single-frequency that described single-frequency is followed the tracks of, and the signal amplitude of this frequency carried out Continuous Tracking, thereby avoid interference band fully, signal to noise ratio (S/N ratio) improves greatly.
Step S14 judges whether the ultra-high frequency signal of above-mentioned single-frequency tracking is unusual, judges promptly whether the ultra-high frequency signal amplitude of above-mentioned single-frequency occurs unusually.
If occur among the above-mentioned steps S14 then carrying out step S15 unusually, measure the relevant ultrahigh frequency characteristic that unusual ultra-high frequency signal occurs, and carry out Primary Location according to the ultrahigh frequency characteristic, determine a region of discharge.Need to prove, above-mentioned ultrahigh frequency characteristic for example comprises: Wave data, frequency spectrum data, phase data or the like, and can obtain by broadband high-speed oscillograph and spectrum analyzer, in addition, when the relevant ultrahigh frequency characteristic of unusual ultra-high frequency signal measure occurring, also comprise the situation of measuring applied voltage, because the power of local discharge signal and feature and applied voltage have direct cause-effect relationship, the phase place of applied voltage is the important information of research discharge characteristic, therefore should guarantee as far as possible that voltage-phase is accurate.
In addition, the above-mentioned Primary Location of carrying out is to analyze according to the mistiming of time domain waveform in the described ultrahigh frequency characteristic to calculate and determine, for example: two uhf sensors are set, and the high frequency response characteristic of these two uhf sensors, and the identical precondition of signal cable length under, if the distance of two uhf sensors is S, and discharge position is x to the distance of one of them uhf sensor, the mistiming that two sensors receives discharge signal is Δ t (can be learnt by waveform), and the velocity of propagation of uhf electromagnetic wave is c (3 * 10
8M/s), then discharge position can be calculated as follows: x=(c Δ t+s)/2; And according to mistiming of preceding several pulses of ultrahigh frequency original waveform, and consider inherent error, precision can reach 1m, wherein, requires oscillographic sampling rate can not be lower than 10
9Sa/s, bandwidth is not less than 1GHz.
Through the Primary Location of step S15, carry out step S17 then, in described region of discharge, calibrate AE sensor is set, and acoustic emission signal is monitored.Need to prove: (comprising monitoring and measurement) in carrying out the acoustic emission detection process can be by calibrate AE sensor, external amplifier, main amplifier and parts such as wave detector, voice output, magnitude calculation and demonstration.Wherein, the resonance frequency of calibrate AE sensor is 30kHz, and survey frequency is 10kHz to 500kHz; And acoustic emission signal can be sent into the storage of broadband high-speed oscillograph, also can transfer sub-audible sound to, is convenient to the testing staff and judges whether sub-audible sound is unusual.
Then in step S18, measurement monitors the relevant characteristics of Acoustic Emission data of acoustic emission signal, finish the location of point of discharge according to the characteristics of Acoustic Emission data, and be the sound intensity of sending out each calibrate AE sensor position in the characteristic according to sound to the location of point of discharge here, for example according to the intensity distributions of acoustic emission signal around the GIS shell, along the GIS enclosure axis to propagation condition, through the research of the attenuation of disc insulator, the decay of acoustic emission signal is very fast as can be known, and can finish according to sound intensity contour map when carrying out static fixing; Acoustic emission signal when monitoring come examination signal point of maximum intensity by the position of mobile calibrate AE sensor, and the signal point of maximum intensity is measured, and with intensity maximum point location, precision can reach 10cm above-mentioned carrying out.
If in step S14,, calibrate AE sensor is set and carries out acoustic emission detection if occur then carrying out step S16 unusually, transfer acoustic emission signal to sub-audible sound, judge whether sub-audible sound is unusual, if step S18 occurs unusually then carrying out.
At last, carry out step S19, behind the location of finishing, comprehensively compare and analyze in conjunction with relevant ultrahigh frequency characteristic and characteristics of Acoustic Emission data, and set up the coherent detection database point of discharge.For example: follow the tracks of collection of illustrative plates such as waveform, PHASE DISTRIBUTION figure, histogram with pulse train waveform, single pulse waveforms, unifrequency and show the GIS shelf depreciation, and these typical collection of illustrative plates and discharge characteristics, the analysis and the judgement that can be field actual measurement results provide reference and reference.In addition, in present embodiment, on the basis of the common discharge defective of GIS that the above-mentioned detection database of research reacts, with the 110kV GIS six big class discharging models that have been spaced apart fundamental construction, comprise that there is insulator, the nonmetal legacy of outer casing inner wall, high-pressure conductor metal tip, the suspended particle discharging model of flashover vestige on metallic particles, the metallic particles of outer casing inner wall, surface on the insulator.By the weight and size, most advanced and sophisticated acutance, the kind of nonmetal legacy, the width of flashover vestige etc. that changes particle, can simulate different discharge severities.And, accumulated nearly thousand typical discharge data by a large amount of model tests of above-mentioned GIS shelf depreciation, the detection of dispatching from the factory, the on-the-spot detection.Wherein, the GIS equipment rated voltage that relates to can be from 110kV to 550kV, and that working condition comprises is in service, handing-over is withstand voltage, it is charged etc. to start.Therefore, the coherent detection database of above-mentioned foundation is owing to having more science, so help investigation and scientific research to the GIS shelf depreciation.
In sum, method for detecting partial discharge of gas insulated switchgear of the present invention is not only more effective to the GIS partial discharge monitoring, and the ultrahigh frequency characteristic that obtains and characteristics of Acoustic Emission data compare of analysis mutually, so have more science, help scientific research to the GIS shelf depreciation; And after the Primary Location through the ultrahigh frequency characteristic, in the less region of discharge of scope, carry out the acoustic emission detection location, not only efficiently solve the inefficient problem of acoustic emission detection, and make the location more accurately effectively, and exact position that can faster discovery point of discharge.
The foregoing description only is illustrative principle of the present invention and effect thereof, but not is used to limit the present invention.Any those skilled in the art all can be under spirit of the present invention and category, and the foregoing description is modified and changed.Therefore, the scope of the present invention should be foundation with the scope of claims.
Claims (10)
1, a kind of detection method for local discharge of gas insulated combined electrical equipment is characterized in that may further comprise the steps:
In described gas insulated combined electrical equipment relevant position uhf sensor is set, the ultra-high frequency signal that described uhf sensor is monitored carries out spectrum analysis, determines to detect frequency band after the overfrequency examination;
Ultra-high frequency signal in the described detection frequency band is carried out single-frequency to be followed the tracks of;
If occur in the single-frequency tracing process then measuring the relevant ultrahigh frequency characteristic that unusual ultra-high frequency signal occurs unusually, and carry out Primary Location, determine a region of discharge according to the ultrahigh frequency characteristic;
In described region of discharge, calibrate AE sensor is set, and acoustic emission signal is monitored;
Measurement monitors the relevant characteristics of Acoustic Emission data of acoustic emission signal, finishes location to point of discharge according to the characteristics of Acoustic Emission data.
2, the detection method for local discharge of gas insulated combined electrical equipment as claimed in claim 1, it is characterized in that this method also is included in carries out before single-frequency is followed the tracks of the gas componant in the described gas insulated combined electrical equipment being detected and analyzing.
3, the detection method for local discharge of gas insulated combined electrical equipment as claimed in claim 1, it is characterized in that: if in the single-frequency tracing process, do not occur unusual, acoustic emission detection point then is set and carries out acoustic emission detection, transfer acoustic emission signal to sub-audible sound, if sub-audible sound occurs unusual, then detected acoustic emission signal is carried out the characteristics of Acoustic Emission DATA REASONING, finish the discharge location according to the characteristics of Acoustic Emission data.
4, as the detection method for local discharge of claim 1 or 3 described gas insulated combined electrical equipments, after it is characterized in that this method also is included in the location of finishing point of discharge, comprehensively compare and analyze in conjunction with relevant ultrahigh frequency characteristic and characteristics of Acoustic Emission data, and set up the coherent detection database.
5, as the detection method for local discharge of claim 1 or 3 described gas insulated combined electrical equipments, it is characterized in that: carry out acoustic emission signal when monitoring above-mentioned, come examination signal point of maximum intensity by the position of mobile calibrate AE sensor, and the signal point of maximum intensity is measured.
6, the detection method for local discharge of gas insulated combined electrical equipment as claimed in claim 1 is characterized in that: when the relevant ultrahigh frequency characteristic of unusual ultra-high frequency signal measure occurring, also comprise the situation of measuring applied voltage.
7, the detection method for local discharge of gas insulated combined electrical equipment as claimed in claim 1 is characterized in that: described uhf sensor is to be located at the discontinuous place of described gas insulated combined electrical equipment outer cover metal body.
8, the detection method for local discharge of gas insulated combined electrical equipment as claimed in claim 1 is characterized in that: it is the ultra-high frequency signal of selecting single-frequency that described single-frequency is followed the tracks of, and the amplitude of its signal is carried out Continuous Tracking.
9, the detection method for local discharge of gas insulated combined electrical equipment as claimed in claim 1 is characterized in that: the mistiming according to time domain waveform in the ultrahigh frequency characteristic is carried out Primary Location.
10, the detection method for local discharge of gas insulated combined electrical equipment as claimed in claim 1 is characterized in that: the location of carrying out point of discharge according to the sound intensity of each calibrate AE sensor position in the characteristics of Acoustic Emission data.
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| CN106291271A (en) * | 2016-07-19 | 2017-01-04 | 国网天津市电力公司 | Judge the live detection method of combined electrical apparatus high-voltage and earth potential electric discharge |
| CN106291271B (en) * | 2016-07-19 | 2018-12-07 | 国网天津市电力公司 | Judge the live detection method of combined electrical apparatus high-voltage potential and ground potential electric discharge |
| CN110703051A (en) * | 2019-10-15 | 2020-01-17 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Precise positioning method for fault point of GIL (Gate in L) voltage withstand test based on acoustic wave detection method |
| CN113239595A (en) * | 2021-05-27 | 2021-08-10 | 国网福建省电力有限公司建设分公司 | Finite element-based GIS (gas insulated switchgear) intracavity suspended particle residual quantity calculation method |
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