CN105043993A - Method for detecting composite insulator based on multi-spectrum - Google Patents

Method for detecting composite insulator based on multi-spectrum Download PDF

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Publication number
CN105043993A
CN105043993A CN201510412958.6A CN201510412958A CN105043993A CN 105043993 A CN105043993 A CN 105043993A CN 201510412958 A CN201510412958 A CN 201510412958A CN 105043993 A CN105043993 A CN 105043993A
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insulator
detection
composite insulator
infrared
discharge
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刘辉
沈庆河
苏建军
姚金霞
胡晓黎
刘嵘
段玉兵
张皓
赵富强
许光可
张围围
许冬冬
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Shandong Electric Power Co Ltd
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Shandong Electric Power Co Ltd
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Abstract

The invention discloses a method for detecting a composite insulator based on multi-spectrum. The method comprises: selecting a detection device; under a same operation condition, performing visible light detection, infrared detection, and UV detection of the same composite insulator by using the detection device to obtain detection images of the composite insulator; performing comparison of a partial discharge lighting spot of the visible light image, a partial hot spot of the infrared image, and an electric corona spot of the UV image; performing comparison of visual light images, infrared images, and UV images of different composite insulators of the same pole tower of the same line under the same operation condition; establishing a multi-spectrum detection database according to each composite insulator; and performing data comparison and finding out existing data difference according to detection data in a certain period. According to the method, visual light detection, infrared detection, and UV detection can be organically combined; advantages are complemented; and electrified detection of the insulator is easy to perform. A defect of the composite insulator can be discovered in time, so that large-area tour-inspection is convenient to develop.

Description

A kind of based on multispectral composite insulator detection method
Technical field
The present invention relates to a kind of detection method, especially a kind of based on multispectral composite insulator detection method, belong to the technical field that electric insulator detects.
Background technology
Insulator, as the important component part of transmission line of electricity, plays an important role in guarantee safe operation of power system.Composite insulator not only has the little and good anti-fouling flashover performance of hydrophobicity performance, hydrophobicity migration performance, equivalent diameter, and have that intensity is high, lightweight, the feature such as not easily fragmentation, convenient transportation, operation maintenance are easy, use in a large number in AC and DC transmission line of electricity, and also start batch in the AC and DC engineering of newly-built 500kV and above to use even completely, its hanging wire operational effect is good, has become Preventing Outdoor Insulator from Pollution Flashover for Power Transmission effective method.
Along with increasing gradually of composite insulator usage quantity, the increase gradually of tenure of use, under the effects such as highfield, acid rain, acid mist, wire load, icing, blast, temperature shock, the insulator deterioration that it occurs, hydrophobic nature decline, physical strength reduction, electric property decline, seal break-off, insulator brittle failure are fallen the problems such as string and are also increasingly increased.The method of existing detection porcelain and glass insulator is only limitted to detect porcelain glass insulator zero (low) value situation, still can not effectively find and judge composite insulator produced problem in operation, therefore the operation conditions for composite insulator is necessary, practicable live detection means are proposed, find composite insulator defect in advance, instruct the operation maintenance of composite insulator, improve safety and the reliability service level of electric system.
Summary of the invention
For solving the deficiency that prior art exists, the invention discloses a kind of based on multispectral composite insulator detection method, based on the composite insulator live detection technology of three kinds of spectrum such as visible ray, infrared, ultraviolet, visible ray, infrared, ultraviolet three kinds of detection meanss are organically combined, have complementary advantages, easily live detection is carried out to insulator, can Timeliness coverage composite insulator defect, be convenient to carry out large-area patrolling and examining.
For achieving the above object, concrete scheme of the present invention is as follows:
A kind of based on multispectral composite insulator detection method, comprise the following steps:
Step one: select checkout equipment, specifically comprise visible detection equipment, infrared detection equipment and uv detection devices;
Step 2: under identical operating condition, utilize checkout equipment to carry out visible detection, infrared detection and UV detect to same composite insulator, obtain the detected image of this composite insulator, detected image comprises visible images, infrared image and ultraviolet image;
Step 3: the shelf depreciation luminous point of visible images, the local hot spot of infrared image and the corona point of ultraviolet image are compared, if three position has consistance, then determines the position that there is shelf depreciation;
Step 4: compare the visible images of the different composite insulator of the same base shaft tower of same circuit, infrared image and ultraviolet image under identical operating condition, compares content and comprises shelf depreciation luminous point, the relative temperature rise of infrared heat spot, UV corona point of discharge photon number;
Step 5: for each composite insulator, sets up multispectral Test database, according to the data of the detection of some cycles, data are compared, find out the data difference of existence, to grasp the variation tendency of this composite insulator operation conditions, then carry out judgement composite insulator defect.
In step 4, if certain composite insulator has luminous point, relatively temperature rise be greater than 1K, UV corona discharging light subnumber more than reference insulator, then show this insulator existing defects.
The described checkout equipment that utilizes detects, and this detection needs specific environmental baseline, environmental baseline demand fulfillment:
The three kinds of detections of visible ray Partial Discharge Detection, infrared detection and UV detect should be carried out in section at one time, environmental baseline needs for sunny night, wind speed≤0.5m/s, humidity≤85%, without electromagnetic interference (EMI), background radiation is balanced, and visible ray configuration of surface detects should on the sunny daytime identical with the wind speed at above-mentioned night, humidity, electromagnetic interference (EMI) and background radiation condition.
In described step 2, visible detection comprises insulator surface defects detection and insulator paradoxical discharge detects;
Detect insulator surface defect, comprise insulation full skirt and occur crackle, be full of cracks, efflorescence, ablation phenomen, outer covering layer has groove and the vestige of erosion, insulation full skirt flashover, full skirt or outer covering layer cracking, and outer covering layer is broken, and plug exposes;
Insulator paradoxical discharge is observed, if surface of composite insulator exists shelf depreciation, shelf depreciation has luminescence phenomenon, when night or dark, utilizes binoculars or focal length camera can observe Discharge illuminating phenomenon.
In described step 2, infrared detection, refer to the temperature variation being detected composite insulator by thermal infrared imager, the be in operation change of its megohmite insulant and heating of composite insulator links together, dielectric loss when shelf depreciation, leakage current flow through megohmite insulant or ohmic loss all can cause the rising of insulator local temperature, can find according to fever phenomenon the local damage and the discharge defect that exchange composite insulator.
In described step 2, UV detect, refer to the corona and the discharge scenario that detect and record insulator surface by ultraviolet imaging instrument, charged particle compound outwards a large amount of radiates ultraviolet in shelf depreciation and corona process, the ultraviolet major part wavelength that electric discharge produces is in 240 ~ 280nm, detect the ultraviolet of this part wavelength, as the foundation of judgment device electric discharge, UV detect system statistics is to the corona pulse number in the unit interval, determine strength of discharge, for detecting those small but stable shelf depreciations, detect insulator degradation failure.
When composite insulator detects, emphasis detects position and comprises near the composite insulator of conductor wire end and cluster parachute, the sheath of composite insulator.
If there is one of following situation, then can judge that this insulator lost efficacy, and should change: 1. brittle, the efflorescence of umbrella cover or break; 2. there is creepage trace and deteriorate in umbrella cover, and 10% or corrosion depth that cumulative length is greater than insulator creepage distance are greater than 30% of present position material thickness; 3. each point of attachment seal failure of insulator, occur coming unstuck, crack and slippage; 4. after flashover, full skirt is surperficial by the insulator of flash burn.
Beneficial effect of the present invention:
The present invention is based on the composite insulator live detection technology of three kinds of spectrum such as visible ray, infrared, ultraviolet, visible ray, infrared, ultraviolet three kinds of detection meanss are organically combined, have complementary advantages, easily live detection is carried out to insulator, can Timeliness coverage composite insulator defect, be convenient to carry out large-area patrolling and examining.
Accompanying drawing explanation
Fig. 1 composite insulator ultraviolet image;
Fig. 2 composite insulator visible images;
Fig. 3 composite insulator infrared image;
Embodiment:
A kind of based on multispectral composite insulator detection method, specifically comprise:
1) under suitable external condition, suitable visible ray, infrared and uv detection devices is selected.
2) under identical operating condition, position is detected to the emphasis of same composite insulator and carries out visible ray, infrared and UV detect,
3) lateral comparison is carried out to visible images, infrared image and ultraviolet image, Comprehensive Comparison examine the operation conditions of composite insulator.
4) under identical operating condition, the different composite insulator of same circuit same base shaft tower or the different parts of same composite insulator are made comparisons.Longitudinal comparison is carried out to visible images, infrared image and ultraviolet image, compare photon numbers or the ultraviolet image of corresponding position corona activity generation, use absolute temperature difference method, the error that the external factor such as detecting distance, site environment temperature, humidity are brought can be effectively prevent.
5) for often propping up composite insulator, set up multispectral detection archives, according to the data that annual (secondary) detects, data are compared, find out the data difference of existence, comprise temperature, the change of humidity equal distribution, to grasp the variation tendency of this composite insulator operation conditions, then judge.
6) detect the scope that the composite insulator defect found should include equipment deficiency management system in, process according to equipment deficiency management process.
Suitable environmental baseline should meet following requirement: in view of the change of line load, the change of meteorological condition, for ease of comparative analysis and guarantee data accuracy, three kinds of detections such as visible ray Partial Discharge Detection, infrared detection and UV detect should be carried out in section at one time, therefore ideal environmental baseline is sunny night, wind speed≤0.5m/s, humidity≤85%, without electromagnetic interference (EMI), background radiation is balanced, and visible ray configuration of surface detects should be arranged in close sunny daytime.
Suitable visible ray, infrared and uv detection devices should meet following requirement: visible detection equipment, has the functions such as high power is looked in the distance, long-focus, video record; Infrared detection equipment, should be simple to operate, easy to carry, in there is high measurement accuracy and measurement range, higher temperature resolution and spatial resolution, there is the correction model of atmospheric conditions, being equipped with, long focal length lens, have eyepiece frame, antijamming capability is strong; Uv detection devices, simple to operate, easy to carry, clear picture, stable, have higher resolution and dynamic and static image memory function, ultraviolet image can be superposed with visible images, antijamming capability is strong.
Visible detection, one is detect insulator surface defect, and comprise insulation full skirt and occur crackle, be full of cracks, efflorescence, ablation phenomen, outer covering layer has groove and the vestige of erosion, insulation full skirt flashover, full skirt or outer covering layer cracking, and outer covering layer is broken, and plug exposes; Two is paradoxical discharge observation, if surface of composite insulator exists stronger shelf depreciation, shelf depreciation has luminescence phenomenon, when night or dark, utilizes binoculars or focal length camera can observe Discharge illuminating phenomenon.
Described infrared detection, refer to and pass through thermal infrared imager, detect the temperature variation of composite insulator, the composite insulator normal and heating of the change of its megohmite insulant that is in operation links together, dielectric loss when shelf depreciation, leakage current flow through megohmite insulant or ohmic loss all can cause the rising of insulator local temperature, can find according to fever phenomenon the local damage and the discharge defect that exchange composite insulator.
UV detect, refers to the corona and the discharge scenario that are detected and recorded insulator surface by ultraviolet imaging instrument.The existence of corona and development are signs of insulator arc-over, are also important indicative characters of the Ageing of Insulators.In certain external environment, insulator contamination makes moist or is corroded and causes its insulating property to reduce, especially surface forms conductivity silicon carbide passage, all can cause corona and partial discharge phenomenon aggravation, charged particle compound outwards a large amount of radiates ultraviolet in shelf depreciation and corona process, the ultraviolet major part wavelength that electric discharge produces, in 240 ~ 280nm, detects the ultraviolet of this part wavelength, can as the foundation of judgment device electric discharge.UV detect system can count on the corona pulse number in the unit interval, determines strength of discharge, can be used for detecting those small but stable shelf depreciations, detects the faults such as insulator deterioration.
The emphasis of composite insulator detects position and comprises near the composite insulator of conductor wire end and the cluster parachute of composite insulator, sheath, composite insulator near conductor wire end is in high-pressure side, the voltage that insulator bears is far above other position, Analysis of End Electric Field intensity is relatively high, this makes a corona of insulator chain, deterioration is often from side of wire insulator, become the full skirt of insulator again, sheath by organic synthesis material as EP rubbers, high-temperature silicon disulfide rubbers etc. are made, plug makes reinforcing material with glass fibre, epoxy resin makes the glass fiber reinforced plastics composite material of matrix, the aging fluid sealant that easily causes of full skirt and sheath cracks, extraneous sour environment causes corrosion to plug, atmospheric environment, electric field, the synergy of mechanical force etc., glass fibre in plug can produce mechanical fatigue, epoxide resin material accelerated deterioration, easily cause mandrel fracture.
Defects of insulator can be divided three classes: one, general defect.The corona discharge existed is abnormal, and there is certain gradient in temperature field, produces burn-in effects, but also can not cause accident, require to place on record to equipment, notes the development observing its defect; Two, major defect.The corona discharge existed is abnormal outstanding, and equipment exists overheated, and the temperature difference is comparatively large, should shorten sense cycle and utilize interruption maintenance chance, and planned arrangement maintenance, eliminates defect; Three, urgent defect.The corona discharge that composite insulator exists is serious, and maximum temperature exceedes the maximum permissible temperature of regulation, should arrange the process that has a power failure immediately.If there is one of following situation, then can judge that this insulator lost efficacy, and should change: 1. brittle, the efflorescence of umbrella cover or break; 2. there is creepage trace and deteriorate in umbrella cover, and 10% or corrosion depth that cumulative length is greater than insulator creepage distance are greater than 30% of present position material thickness; 3. each point of attachment seal failure of insulator, occur coming unstuck, crack and slippage; 4. after flashover, full skirt is surperficial by the insulator of flash burn.
Object lesson: at sunny night, wind speed≤0.5m/s, humidity≤85%, without electromagnetic interference (EMI), under background radiation equilibrium condition, selects long-focus high power to look in the distance, has the camera of video record function; In there is high measurement accuracy and measurement range, higher temperature resolution and spatial resolution, there is the correction model of atmospheric conditions, being equipped with, the thermal infrared imager of long focal length lens, have eyepiece frame, analysis software feature richness, antijamming capability is strong; Simple to operate, easy to carry, clear picture, stable, there is higher resolution and dynamic and static image memory function, ultraviolet image can be superposed with visible images, the uv detection devices that antijamming capability is strong.
Under identical operating condition, visible ray, infrared and UV detect are carried out to the cluster parachute of the composite insulator of the close conductor wire end of same composite insulator and composite insulator, sheath, focal length camera looks into fee insulator surface is utilized whether to have Discharge illuminating phenomenon, thermal infrared imager is utilized to detect the relative temperature rise of insulator surface, ultraviolet thermal imaging system is utilized to detect the corona phenomenon of insulator surface, carry out lateral comparison to visible images, infrared image and ultraviolet image, whether luminescence, temperature rise, corona discharge position have consistance.The image detected as shown in Figure 1-Figure 3.
Under identical operating condition, the different composite insulator of same circuit same base shaft tower or the different parts of same composite insulator are made comparisons.Longitudinal comparison is carried out to visible images, infrared image and ultraviolet image, compare photon numbers or the ultraviolet image of corresponding position corona activity generation, use absolute temperature difference method, the error that the external factor such as detecting distance, site environment temperature, humidity are brought can be effectively prevent.
For often propping up composite insulator, set up multispectral detection archives, according to the data that annual (secondary) detects, data are compared, find out the data difference of existence, comprise temperature, the change of humidity equal distribution, to grasp the variation tendency of this composite insulator operation conditions, then judge.
Detect the scope that the composite insulator defect found should include equipment deficiency management system in, process according to equipment deficiency management process.If the corona discharge existed is abnormal, there is certain gradient in temperature field, produces burn-in effects, but also can not cause accident, require to place on record to equipment, notes the development observing its defect; If the corona discharge existed is abnormal outstanding, equipment exists overheated, and the temperature difference is comparatively large, should shorten sense cycle and utilize interruption maintenance chance, and planned arrangement maintenance, eliminates defect; If the corona discharge that composite insulator exists is serious, maximum temperature exceedes the maximum permissible temperature of regulation, should arrange the process that has a power failure immediately.If there is one of following situation, then can judge that this insulator lost efficacy, and should change: 1. brittle, the efflorescence of umbrella cover or break; 2. there is creepage trace and deteriorate in umbrella cover, and 10% or corrosion depth that cumulative length is greater than insulator creepage distance are greater than 30% of present position material thickness; 3. each point of attachment seal failure of insulator, occur coming unstuck, crack and slippage; 4. after flashover, full skirt is surperficial by the insulator of flash burn.
Although above-mentioned, the specific embodiment of the present invention is described; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection scope of the present invention.

Claims (7)

1., based on a multispectral composite insulator detection method, it is characterized in that, comprise the following steps:
Step one: select checkout equipment, specifically comprise visible detection equipment, infrared detection equipment and uv detection devices;
Step 2: under identical operating condition, utilize checkout equipment to carry out visible detection, infrared detection and UV detect to same composite insulator, obtain the detected image of this composite insulator, detected image comprises visible images, infrared image and ultraviolet image;
Step 3: the shelf depreciation luminous point of visible images, the local hot spot of infrared image and the corona point of ultraviolet image are compared, if three position has consistance, then determines the position that there is shelf depreciation;
Step 4: compare the visible images of the different composite insulator of the same base shaft tower of same circuit, infrared image and ultraviolet image under identical operating condition, compares content and comprises shelf depreciation luminous point, the relative temperature rise of infrared heat spot, UV corona point of discharge photon number;
Step 5: for each composite insulator, sets up multispectral Test database, according to the data of the detection of some cycles, data are compared, find out the data difference of existence, to grasp the variation tendency of this composite insulator operation conditions, then carry out judgement composite insulator defect.
2. as claimed in claim 1 a kind of based on multispectral composite insulator detection method, it is characterized in that, in step 4, if certain composite insulator has luminous point, relatively temperature rise be greater than 1K, UV corona discharging light subnumber more than reference insulator, then show this insulator existing defects.
3. as claimed in claim 1 a kind of based on multispectral composite insulator detection method, it is characterized in that, the described checkout equipment that utilizes detects, and this detection needs specific environmental baseline, environmental baseline demand fulfillment:
The three kinds of detections of visible ray Partial Discharge Detection, infrared detection and UV detect should be carried out in section at one time, environmental baseline needs for sunny night, wind speed≤0.5m/s, humidity≤85%, without electromagnetic interference (EMI), background radiation is balanced, and visible ray configuration of surface detects should on the sunny daytime identical with the wind speed at above-mentioned night, humidity, electromagnetic interference (EMI) and background radiation condition.
4. one as claimed in claim 1 is based on multispectral composite insulator detection method, it is characterized in that, in described step 2, visible detection comprises insulator surface defects detection and insulator paradoxical discharge detects;
Detect insulator surface defect, comprise insulation full skirt and occur crackle, be full of cracks, efflorescence, ablation phenomen, outer covering layer has groove and the vestige of erosion, insulation full skirt flashover, full skirt or outer covering layer cracking, and outer covering layer is broken, and plug exposes;
Insulator paradoxical discharge is observed, if surface of composite insulator exists shelf depreciation, shelf depreciation has luminescence phenomenon, when night or dark, utilizes binoculars or focal length camera can observe Discharge illuminating phenomenon.
5. as claimed in claim 1 a kind of based on multispectral composite insulator detection method, it is characterized in that, in described step 2, infrared detection, refer to the temperature variation being detected composite insulator by thermal infrared imager, the be in operation change of its megohmite insulant and heating of composite insulator links together, dielectric loss when shelf depreciation, leakage current flow through megohmite insulant or ohmic loss all can cause the rising of insulator local temperature, can find according to fever phenomenon the local damage and the discharge defect that exchange composite insulator.
6. as claimed in claim 1 a kind of based on multispectral composite insulator detection method, it is characterized in that, in described step 2, UV detect, refer to the corona and the discharge scenario that detect and record insulator surface by ultraviolet imaging instrument, charged particle compound outwards a large amount of radiates ultraviolet in shelf depreciation and corona process, the ultraviolet major part wavelength that electric discharge produces is in 240 ~ 280nm, detect the ultraviolet of this part wavelength, as the foundation of judgment device electric discharge, UV detect system statistics is to the corona pulse number in the unit interval, determine strength of discharge, for detecting those small but stable shelf depreciations, detect insulator degradation failure.
7. one as claimed in claim 1 is based on multispectral composite insulator detection method, it is characterized in that, when composite insulator detects, emphasis detects position and comprises near the composite insulator of conductor wire end and cluster parachute, the sheath of composite insulator;
If there is one of following situation, then can judge that this insulator lost efficacy, and should change: 1. brittle, the efflorescence of umbrella cover or break; 2. there is creepage trace and deteriorate in umbrella cover, and 10% or corrosion depth that cumulative length is greater than insulator creepage distance are greater than 30% of present position material thickness; 3. each point of attachment seal failure of insulator, occur coming unstuck, crack and slippage; 4. after flashover, full skirt is surperficial by the insulator of flash burn.
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Application publication date: 20151111