CN105372562A - Method and system for detecting ultraviolet discharge degree by means of set indexes - Google Patents
Method and system for detecting ultraviolet discharge degree by means of set indexes Download PDFInfo
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- CN105372562A CN105372562A CN201510686692.4A CN201510686692A CN105372562A CN 105372562 A CN105372562 A CN 105372562A CN 201510686692 A CN201510686692 A CN 201510686692A CN 105372562 A CN105372562 A CN 105372562A
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- 239000012212 insulator Substances 0.000 claims abstract description 65
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- 238000010891 electric arc Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
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- 238000007599 discharging Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1218—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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Abstract
The invention discloses a method and system for detecting ultraviolet discharge degree by means of set indexes. The method comprises the following steps of: S1, acquiring a discharge video of an insulator chain; S2, acquiring at least two set indexes from the discharge video; and S3, separately acquiring the detection result of the ultraviolet discharge degree according to a relation between each set index and a corresponding index threshold, wherein the insulator chain is in a severe discharge state if any detection result indicates that the insulator chain is in a severe discharge state. The method and system for detecting the ultraviolet discharge degree by means of the set indexes may well indicate the discharge degree of the insulator chain.
Description
Technical field
The present invention relates to ultraviolet corona detector field, particularly a kind of method and system utilizing setting Indexs measure EUV discharge degree.
Background technology
Ultraviolet corona detector is a kind of contactless live detection technology grown up gradually in recent years, reaches by the ultraviolet light detecting the specific band that the electric discharge of electric insulation equipment produces the object detecting discharge severity and insulating property.In prior art, two general datas that UV detect obtains are ultraviolet light subnumber and ultraviolet facula area, but only can not characterize the discharged condition of insulator chain well according to above two numerical value, this causes obstacle to the further application of ultraviolet corona detector and popularization.
Summary of the invention
The object of the invention is to propose a kind of method and system utilizing setting Indexs measure EUV discharge degree, to solve the technical matters that accurately can not detect insulator chain discharged condition that above-mentioned prior art exists.
The present invention proposes a kind of method utilizing setting Indexs measure EUV discharge degree, comprises the following steps:
The electric discharge video of S1, acquisition insulator chain;
S2, obtain from described electric discharge video at least two kinds setting indexs;
S3, obtain the testing result of EUV discharge degree respectively according to each setting index and the relation of corresponding metrics-thresholds, if wherein any one testing result is that insulator chain is in serious discharge condition, then insulator chain is in serious discharge condition.
Preferably, described setting index comprises ratio and the number of spots of photon number relative fluctuation, the hot spot total area, maximum facula area and the hot spot total area.
Preferably, when described setting index is photon number relative fluctuation, described photon number relative fluctuation is the ratio of the standard deviation of photon number sequence and the mean value of photon number sequence;
In described step S2, from described electric discharge video, obtain the photon number of display every specific time interval, obtain the photon number sequence comprising K photon number, according to described photon number retrieval photon number relative fluctuation, K be not less than 2 positive integer;
In described step S3, judge whether described photon number relative fluctuation is less than relative fluctuation threshold value, if so, think that insulator chain is in serious discharge condition.
Preferably, K be not less than 5 positive integer.
Preferably, as a kind of during described setting index is the ratio of the hot spot total area, maximum facula area and the hot spot total area or number of spots:
At described step S2, from described electric discharge video, read the some frame electric discharge images in specific duration, obtain the setting index of every frame electric discharge image respectively;
At described step S3, take frame number as horizontal ordinate, the setting index that every frame electric discharge image is corresponding is ordinate, draw the curve map that setting index changes with frame number, judge whether the pulse number that amplitude in described curve map is greater than predetermined threshold value is not less than predetermined number, if so, think that insulator chain is in serious discharge condition.
Preferably, when described setting index is the hot spot total area,
At described step S2, from described electric discharge video, read the some frame electric discharge images in specific duration, obtain the setting index of every frame electric discharge image respectively;
In described step S3, take frame number as horizontal ordinate, the setting index that every frame electric discharge image is corresponding is ordinate, draws the total area curve map that setting index changes with frame number;
Subsection integral process is carried out to described total area curve map and obtains average area curve map; Wherein, described subsection integral process comprises: from the i-th frame electric discharge image, the electric discharge image got every k frame has been dot image, the hot spot average area of m frame electric discharge image after calculating every frame starting point image respectively, and i, k, m are positive integer;
Judge whether have value to be greater than second area threshold value in described average area curve map, if so, then to think that insulator chain is in serious discharge condition.
Preferably, described setting index at least comprises photon number relative fluctuation or the hot spot total area.
The present invention also proposes a kind of system utilizing setting Indexs measure EUV discharge degree, comprising:
Electric discharge video acquiring module, for obtaining the electric discharge video of insulator chain;
Setting index selection module, for obtaining at least two kinds of setting indexs from described electric discharge video; And
Degree of discharge detection module, for obtaining the testing result of EUV discharge degree respectively according to each setting index and the relation of corresponding metrics-thresholds, if wherein any one testing result is that insulator chain is in serious discharge condition, then insulator chain is in serious discharge condition.
Preferably, described setting index comprises ratio and the number of spots of photon number relative fluctuation, the hot spot total area, maximum facula area and the hot spot total area.
Preferably, described setting index at least comprises photon number relative fluctuation or the hot spot total area.
The method and system of the utilization setting Indexs measure EUV discharge degree that the present invention proposes can characterize insulator chain degree of discharge better, thus serve facilitation to the further application of ultraviolet corona detector and popularization.
Accompanying drawing explanation
Fig. 1 is the method flow diagram of the utilization setting Indexs measure EUV discharge degree of the specific embodiment of the invention one;
Fig. 2 is the total area curve map of the hot spot total area with change in voltage of the specific embodiment of the invention one;
Fig. 3 is the average area curve map of facula area mean value with change in voltage of the specific embodiment of the invention one;
Fig. 4 is the maximum facula area of the specific embodiment of the invention one and the hot spot total area ratio area ratio curve map with change in voltage;
Fig. 5 is the number curve figure of number of spots with change in voltage of the specific embodiment of the invention one.
Embodiment
Embodiment one:
The present invention proposes a kind of method utilizing setting Indexs measure EUV discharge degree, is the method flow diagram of the utilization setting Indexs measure EUV discharge degree of the specific embodiment of the invention one, comprises the following steps see Fig. 1:
The electric discharge video of S1, acquisition insulator chain;
S2, from electric discharge video obtain at least two kinds setting indexs; In an embodiment of the present invention, set index and comprise photon number relative fluctuation, the hot spot total area, the ratio of maximum facula area/hot spot total area and number of spots;
S3, obtain the testing result of EUV discharge degree respectively according to each setting index and the relation of corresponding metrics-thresholds, if wherein any one testing result is that insulator chain is in serious discharge condition, then insulator chain is in serious discharge condition.
The EUV discharge degree detecting method that the present invention proposes comprehensively uses at least two kinds to set index to obtain sensitiveer testing result, provides more reliable reference data for high voltage fault detects.Wherein, adopt the Detection results of photon number relative fluctuation index or hot spot total area index to be better than and adopt the ratio index of maximum facula area/hot spot total area or the Detection results of number of spots index, in an embodiment, the setting index obtained in step s 2 at least will comprise photon number relative fluctuation or the hot spot total area.
Respectively the method utilizing above-mentioned four kinds of setting indexs to carry out EUV discharge degree detecting is explained below.
Setting index one, photon number relative fluctuation
Photon number relative fluctuation refers to the relative discrete degree of photon number sequence; Wherein, photon number sequence obtains by measuring the photon number that in electric discharge video, multiframe electric discharge image shows.In an embodiment of the present invention, definition photon number relative fluctuation is the ratio of the standard deviation of photon number sequence and the mean value of photon number sequence, i.e. the ratio of standard deviation/mean value.Find after deliberation, the voltage that photon number relative fluctuation and insulator chain are applied in has obvious negative correlativing relation, specific as follows:
(1), during weak degrees electric discharge, photon number is no more than 10
3the order of magnitude, and there is no continuation owing to discharging, photon number relative fluctuation is very large;
(2), during moderate electric discharge, there is intermittent arc discharge in insulator chain, photon number is 10
4the order of magnitude fluctuates, and is up to 10
5the order of magnitude, photon number relative fluctuation is larger;
(3), during order of severity electric discharge, there is the arc discharge of high frequency in insulator chain, photon number mean value is 10
4the order of magnitude, photon number relative fluctuation is less.
Accordingly, the present invention proposes a kind of method utilizing photon number relative fluctuation to detect EUV discharge degree, comprises the following steps:
S1, ultraviolet imager is utilized to take the electric discharge video of insulator chain;
S2, from electric discharge video, obtain the photon number of display every specific time interval, obtain the photon number sequence comprising K photon number, according to this photon number retrieval photon number relative fluctuation; In inventive embodiment, from electric discharge video, the photon number that gets about every 3s change once, therefore, preferably obtains a photon number every 4s ~ 5s, K be not less than 5 positive integer;
S3, judge whether photon number relative fluctuation is less than relative fluctuation threshold value (as 0.8), if so, think that insulator chain is in serious discharge condition.
For improving the precision of testing result, above-mentioned steps S3 also comprehensively the mean value of photon number sequence and photon number relative fluctuation can do judgement further to EUV discharge degree:
If the mean value of photon number sequence is greater than 10
4the order of magnitude, and photon number relative fluctuation is less than relative fluctuation threshold value (as 0.8), thinks that insulator chain is in serious discharge condition;
If the mean value of photon number sequence is greater than 10
3the order of magnitude, and photon number relative fluctuation is greater than relative fluctuation threshold value (as 0.8), thinks that insulator chain is in medium discharge condition;
If the mean value of photon number sequence is not more than 10
3the order of magnitude, directly can think that insulator chain is in weak discharge state.
Setting index two, the hot spot total area
See the total area curve map of the hot spot total area with change in voltage that Fig. 2 is the specific embodiment of the invention one, from Fig. 1, the pulsed frequency of curve, amplitude and width can qualitatively judge the EUV discharge degree of insulator chain, but directly perceived not, the object quantitatively detecting degree of discharge cannot be reached.Find after deliberation, when insulator chain electric discharge is faint, the total area of ultraviolet hot spot is less than insulator chain area; When insulator chain electric discharge is serious, the total area of ultraviolet hot spot exceedes insulator chain area.
Be handled as follows Fig. 2: be 0 from voltage, in the specific duration of statistics 30s, voltage often raises 50kV, and in this total area curve map, amplitude exceedes the pulse number of insulator chain area, and statistics is as shown in table 1 below.
| Voltage range (kV) | 0～50 | 50～100 | 100～150 | 150～200 | 200～250 | 250～300 | 300～350 |
| Pulse number | 0 | 1 | 1 | 2 | 1 | 12 | 15 |
Table 1
Can find out, amplitude exceedes the pulse number of insulator chain area and voltage is obvious positive correlation.When voltage is very little, pulse number is 0; Along with voltage raises, there is serious arc discharge in insulator chain, but frequency is very low, and in 30s duration, pulse number is 1 ~ 2; When voltage raises further, the frequency that serious electric discharge occurs significantly improves, and in 30s duration, pulse number has exceeded 2, and now insulator chain flashover may occur at any time.
Accordingly, the present invention proposes a kind of method utilizing the hot spot total area to detect EUV discharge degree, comprises the following steps:
S1, ultraviolet imager is utilized to take the electric discharge video of insulator chain;
S2, the some frame electric discharge images read from electric discharge video in specific duration, obtain the hot spot total area of every frame electric discharge image respectively; Because the ultraviolet imager 1s in the present embodiment takes 30 two field pictures, for 30s duration, can read 900 frame electric discharge images altogether;
S3, be horizontal ordinate with frame number, the hot spot total area that every frame electric discharge image is corresponding is ordinate, draw the total area curve map that the hot spot total area changes with frame number (time), judge whether the pulse number that amplitude in this total area curve map is greater than the first area threshold (as insulator chain area) is not less than M
2, if so, think that insulator chain is in serious discharge condition.
Further, also following judgement can be done according to the pulse number exceeding insulator chain area in this total area curve map to EUV discharge degree:
If pulse number is greater than 0 and be not more than M
2time, think that insulator chain is in medium discharge condition;
If when pulse number is 0, think that insulator chain is in weak discharge state.
In one embodiment, from electric discharge video, the electric discharge image in 30s duration is read, M
2value 3; Can be from electric discharge video, read the electric discharge image in 60s duration, M with expecting
2value 6, by that analogy.
For amplitude and the frequency change of pulse in concentrated expression total area curve map, the present invention also proposes another kind and utilizes the hot spot total area to detect the method for EUV discharge degree, comprises the following steps:
S1, ultraviolet imager is utilized to take the electric discharge video of insulator chain;
S2, from electric discharge video, read some frames electric discharge image in specific duration, obtain the hot spot total area of every frame electric discharge image respectively;
S3, be horizontal ordinate with frame number, the hot spot total area that every frame electric discharge image is corresponding is ordinate, draw the total area curve map that the hot spot total area changes with frame number (time), subsection integral process is carried out to this total area curve map and obtains average area curve map; Wherein, subsection integral process comprises: from the 1st frame electric discharge image, the electric discharge image got every 100 frames has been dot image (namely with the 1st frame electric discharge image, the 101st frame electric discharge image, the 201st frame electric discharge image ... for playing dot image), the hot spot average area of 600 frame electric discharge images after calculating every frame starting point image respectively, in actual treatment, starting point number of image frames and image calculate frame number and can adjust as the case may be.See the average area curve map of facula area mean value with change in voltage that Fig. 3 is the specific embodiment of the invention one, facula area mean value is obvious ascendant trend with voltage, and the low spot of curve fluctuation improves constantly, the amplitude first increases and then decreases of fluctuation;
Judge whether have value to be greater than second area threshold value (as 50% of insulator chain area) in this average area curve map, if so, then to think that insulator chain is in serious discharge condition.
The ratio of setting index three, maximum facula area/hot spot total area
Find after deliberation, insulator chain electric discharge faint time, maximum facula area and other facula areas more close; When insulator chain electric discharge is serious, maximum facula area is almost suitable with the hot spot total area.Be the maximum facula area of the specific embodiment of the invention one and the hot spot total area ratio area ratio curve map with change in voltage see Fig. 4, when voltage is lower, the ratio of maximum facula area and the hot spot total area is less than 0.8 substantially; When voltage raise electric discharge serious time, there will be amplitude close to 1 pulse, and frequency increases.
Accordingly, the present invention proposes a kind of method utilizing the ratio of maximum facula area/hot spot total area to detect EUV discharge degree, comprises the following steps:
S1, ultraviolet imager is utilized to take the electric discharge video of insulator chain;
S2, the some frame electric discharge images read from electric discharge video in specific duration, obtain all facula areas of every frame electric discharge image respectively, from all facula areas of every frame electric discharge image, choose maximum facula area and calculate the hot spot total area of every frame electric discharge image, obtaining the ratio of this frame electric discharge image maximum facula area/hot spot total area; Because the ultraviolet imager 1s in the present embodiment takes 30 two field pictures, for 30s duration, can read 900 frame electric discharge images altogether;
S3, be horizontal ordinate with frame number, the ratio of maximum facula area/hot spot total area that every frame electric discharge image is corresponding is ordinate, the area ratio curve map that the ratio drawing maximum facula area/hot spot total area changes with frame number (time), judges whether the pulse number that amplitude in this area ratio curve map is greater than area ratio threshold value (as 0.9) is not less than M
3, if so, think that insulator chain is in serious discharge condition.
In one embodiment, from electric discharge video, the electric discharge image in 30s duration is read, M
3value is 5; Can be from electric discharge video, read the electric discharge image in 60s duration, M with expecting
3value is 10, by that analogy.
Setting index four, number of spots
Find after deliberation, when insulator chain electric discharge is faint, number of spots is little, and numerical value is more stable; When insulator chain electric discharge is serious, number of spots has and increases trend.The number curve figure of number of spots with change in voltage of the specific embodiment of the invention one see Fig. 5, its Changing Pattern and the hot spot total area similar, incipient stage number of spots is little; There is wide cut pulse in the interstage, but amplitude dispersiveness is very large and frequency is lower; During final stage continuous discharge, the frequency of pulse is the highest, occurs that amplitude reaches 10
3pulse, amplitude also reaches unanimity.
Accordingly, the present invention proposes a kind of method utilizing number of spots to detect EUV discharge degree, comprises the following steps:
S1, ultraviolet imager is utilized to take the electric discharge video of insulator chain;
S2, the some frame electric discharge images read from electric discharge video in specific duration, obtain the number of spots of every frame electric discharge image respectively; Because the ultraviolet imager 1s in the present embodiment takes 30 two field pictures, for 30s duration, can read 900 frame electric discharge images altogether;
S3, be horizontal ordinate with frame number, the number of spots that every frame electric discharge image is corresponding is ordinate, draw the number curve figure that changes with frame number (time) of number of spots, judge whether the pulse number that amplitude in this number curve figure is greater than amount threshold (as 500) is not less than M
4, if so, think that insulator chain is in serious discharge condition.
In one embodiment, from electric discharge video, the electric discharge image in 30s duration is read, M
4value is 5; Can be from electric discharge video, read the electric discharge image in 60s duration, M with expecting
4value is 10, by that analogy.
Embodiment two:
The present invention proposes a kind of system utilizing setting Indexs measure EUV discharge degree, comprising:
Electric discharge video acquiring module, for obtaining the electric discharge video of insulator chain;
Setting index selection module, for obtaining at least two kinds of setting indexs from electric discharge video; And
Degree of discharge detection module, for obtaining the testing result of EUV discharge degree respectively according to each setting index and the relation of corresponding metrics-thresholds, if wherein any one testing result is that insulator chain is in serious discharge condition, then insulator chain is in serious discharge condition.
In one embodiment of the invention, ratio and number of spots that index comprises photon number relative fluctuation, the hot spot total area, maximum facula area and the hot spot total area is set.Preferably, set index and at least will comprise photon number relative fluctuation or the hot spot total area.
It should be noted that, the content such as information interaction, implementation between above-mentioned each module, due to the inventive method embodiment based on same design, its technique effect brought is identical with the inventive method embodiment, particular content see describing in the inventive method embodiment, can repeat no more herein.
Those skilled in the art will recognize that, it is possible for making numerous accommodation to above description, so embodiment is only used to describe one or more particular implementation.
Although described and described and be counted as example embodiment of the present invention, it will be apparent to those skilled in the art that and can make various change and replacement to it, and spirit of the present invention can not have been departed from.In addition, many amendments can be made so that particular case is fitted to religious doctrine of the present invention, and central concept of the present invention described here can not be departed from.So the present invention is not limited to specific embodiment disclosed here, but the present invention also may comprise all embodiments and equivalent thereof that belong to the scope of the invention.
Claims (10)
1. utilize a method for setting Indexs measure EUV discharge degree, it is characterized in that, comprise the following steps:
The electric discharge video of S1, acquisition insulator chain;
S2, obtain from described electric discharge video at least two kinds setting indexs;
S3, obtain the testing result of EUV discharge degree respectively according to each setting index and the relation of corresponding metrics-thresholds, if wherein any one testing result is that insulator chain is in serious discharge condition, then insulator chain is in serious discharge condition.
2. the method utilizing setting Indexs measure EUV discharge degree as claimed in claim 1, it is characterized in that, described setting index comprises ratio and the number of spots of photon number relative fluctuation, the hot spot total area, maximum facula area and the hot spot total area.
3. the method utilizing setting Indexs measure EUV discharge degree as claimed in claim 2, it is characterized in that, when described setting index is photon number relative fluctuation, described photon number relative fluctuation is the ratio of the standard deviation of photon number sequence and the mean value of photon number sequence;
In described step S2, from described electric discharge video, obtain the photon number of display every specific time interval, obtain the photon number sequence comprising K photon number, according to described photon number retrieval photon number relative fluctuation, K be not less than 2 positive integer;
In described step S3, judge whether described photon number relative fluctuation is less than relative fluctuation threshold value, if so, think that insulator chain is in serious discharge condition.
4. the as claimed in claim 3 method utilizing setting Indexs measure EUV discharge degree, is characterized in that, K be not less than 5 positive integer.
5. the as claimed in claim 2 method utilizing setting Indexs measure EUV discharge degree, is characterized in that, as a kind of during described setting index is the ratio of the hot spot total area, maximum facula area and the hot spot total area or number of spots:
At described step S2, from described electric discharge video, read the some frame electric discharge images in specific duration, obtain the setting index of every frame electric discharge image respectively;
At described step S3, take frame number as horizontal ordinate, the setting index that every frame electric discharge image is corresponding is ordinate, draw the curve map that setting index changes with frame number, judge whether the pulse number that amplitude in described curve map is greater than predetermined threshold value is not less than predetermined number, if so, think that insulator chain is in serious discharge condition.
6. the method utilizing setting Indexs measure EUV discharge degree as claimed in claim 2, is characterized in that, when described setting index is the hot spot total area,
At described step S2, from described electric discharge video, read the some frame electric discharge images in specific duration, obtain the setting index of every frame electric discharge image respectively;
In described step S3, take frame number as horizontal ordinate, the setting index that every frame electric discharge image is corresponding is ordinate, draws the total area curve map that setting index changes with frame number;
Subsection integral process is carried out to described total area curve map and obtains average area curve map; Wherein, described subsection integral process comprises: from the i-th frame electric discharge image, the electric discharge image got every k frame has been dot image, the hot spot average area of m frame electric discharge image after calculating every frame starting point image respectively, and i, k, m are positive integer;
Judge whether have value to be greater than second area threshold value in described average area curve map, if so, then to think that insulator chain is in serious discharge condition.
7. the method utilizing setting Indexs measure EUV discharge degree as claimed in claim 2, it is characterized in that, described setting index at least comprises photon number relative fluctuation or the hot spot total area.
8. utilize a system for setting Indexs measure EUV discharge degree, it is characterized in that, comprising:
Electric discharge video acquiring module, for obtaining the electric discharge video of insulator chain;
Setting index selection module, for obtaining at least two kinds of setting indexs from described electric discharge video; And
Degree of discharge detection module, for obtaining the testing result of EUV discharge degree respectively according to each setting index and the relation of corresponding metrics-thresholds, if wherein any one testing result is that insulator chain is in serious discharge condition, then insulator chain is in serious discharge condition.
9. the system utilizing setting Indexs measure EUV discharge degree as claimed in claim 8, it is characterized in that, described setting index comprises ratio and the number of spots of photon number relative fluctuation, the hot spot total area, maximum facula area and the hot spot total area.
10. the system utilizing setting Indexs measure EUV discharge degree as claimed in claim 9, it is characterized in that, described setting index at least comprises photon number relative fluctuation or the hot spot total area.
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| CN105372562B (en) | 2017-07-14 |
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