CN105259527A - Test method for calibrating detection results of different ultraviolet imaging instruments - Google Patents
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- 238000010998 test method Methods 0.000 title claims abstract description 16
- 238000001514 detection method Methods 0.000 title abstract description 4
- 238000003384 imaging method Methods 0.000 title abstract 7
- 238000012360 testing method Methods 0.000 claims abstract description 132
- 239000012212 insulator Substances 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 9
- 239000011521 glass Substances 0.000 claims description 4
- 238000009413 insulation Methods 0.000 abstract description 9
- 230000005684 electric field Effects 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
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- 238000012935 Averaging Methods 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
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- LVYZJEPLMYTTGH-UHFFFAOYSA-H dialuminum chloride pentahydroxide dihydrate Chemical compound [Cl-].[Al+3].[OH-].[OH-].[Al+3].[OH-].[OH-].[OH-].O.O LVYZJEPLMYTTGH-UHFFFAOYSA-H 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
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Abstract
The invention discloses a test method for calibrating detection results of different ultraviolet imaging instruments, which comprises the steps of taking the gain as a variable, testing a standard test object by adopting two ultraviolet imaging instruments under different gains, and acquiring two groups of test results; comparing the two groups of test results, and determining the corresponding gains when the two ultraviolet imaging instruments acquire equal or similar test results, namely the equivalent gains; and taking one group of test results of one ultraviolet imaging instrument as a standard, and comparing a test result of the other ultraviolet image instrument for a practical test object under a second gain value with a test result of the ultraviolet imaging instrument for the standard test object under a first gain value, wherein the first gain value and the second gain value are equivalent gains. After calibration is carried out through the test method disclosed by the invention, detection results of different ultraviolet imaging instruments can be compared so as to accurately determine the discharge severity and the insulation performance of electric power insulation equipment.
Description
Technical field
The present invention relates to the ultraviolet corona detector field of power equipment, particularly relate to a kind of method of testing that different ultraviolet imager testing result is calibrated.
Background technology
Ultraviolet corona detector is a kind of contactless live detection technology grown up gradually in recent years, by detecting the ultraviolet light of the specific band that the electric discharge of electric insulation equipment produces, reaches the object detecting discharge severity and insulating property.EUV discharge testing result mainly comprises ultraviolet light subnumber and ultraviolet facula area, but because different ultraviolet imagers there are differences, larger gap may be there is in ultraviolet light subnumber and the ultraviolet facula area of the same point of discharge be recorded under identical gain is arranged, this relatively brings difficulty to the testing result of different ultraviolet imager, formulates also to the evaluation criteria of EUV discharge testing result and forms obstruction.Existing research only provides the research conclusion of a certain ultraviolet imager mostly, have ignored the difference between different instrument, its research conclusion can not be directly used in the testing result of other ultraviolet imagers or application result inaccurate.
Summary of the invention
For solving the problems of the technologies described above, the present invention proposes a kind of method of testing of calibrating different ultraviolet imager testing result, after being calibrated by method of testing of the present invention, the testing result of different ultraviolet imagers can be contrasted, accurately to judge discharge severity and the insulating property thereof of electric insulation equipment.
For achieving the above object, the present invention by the following technical solutions:
The invention discloses a kind of method of testing that different ultraviolet imager testing result is calibrated, comprise the following steps:
S1: take gain as variable, other parameters are quantitatively, adopt the first ultraviolet imager to test under different gains standard testing object, obtain the first group test result of described standard testing object under different gains;
S2: take gain as variable, other parameters are quantitatively, adopt the second ultraviolet imager to test under different gains described standard testing object, obtain the second group test result of described standard testing object under different gains;
S3: described first group of test result and described second group of test result are compared, determine the gain that described first ultraviolet imager and described second ultraviolet imager are corresponding respectively when obtaining equal or close test result, the gain of this correspondence is the Equivalent Gain of described first ultraviolet imager and described second ultraviolet imager, and wherein close test result is that exponential quantity difference is less than or equal to 5%;
S4: with described first group of test result of described first ultraviolet imager for standard, under the second yield value, carry out the result that the result of testing and described first ultraviolet imager carry out testing for described standard testing object under the first yield value by adopting described second ultraviolet imager for actual tested object to compare, wherein said first yield value and described second yield value are the described Equivalent Gains of described first ultraviolet imager and described second ultraviolet imager.
Preferably, described first group of test result and described second group of test result are all test results of ultraviolet light subnumber.
Preferably, described first group of test result and described second group of test result are all test results of ultraviolet facula area.
Preferably, described first ultraviolet imager or described second ultraviolet imager is adopted specifically to comprise the step that described standard testing object is tested: to select bar electrode and plate electrode to be test platform, plate electrode 3 ~ 5cm described in the distance between two tips of described bar electrode, pressurization 10 ~ 15kV, the detecting distance of described first ultraviolet imager or described second ultraviolet imager is 4 ~ 10m.
Preferably, described first ultraviolet imager or described second ultraviolet imager is adopted specifically to comprise the step that described standard testing object is tested: to select insulator chain to be test platform, described insulator chain of often going here and there hangs 10 ~ 15 insulators, pressurization 200 ~ 400kV, the detecting distance of described first ultraviolet imager or described second ultraviolet imager is 20 ~ 50m.Further, described insulator is dish-type glass insulator.
Preferably, described first ultraviolet imager and described second ultraviolet imager are the different instruments of same model.
Preferably, described first ultraviolet imager or described second ultraviolet imager is adopted to test from 40 to 180 for step-length with 10 in gain standard testing object.
The present invention's beneficial effect is compared with prior art: by method of testing of the present invention, calibrate different ultraviolet imager testing result, obtain the Equivalent Gain that different ultraviolet imager is corresponding, can be contrasted by the Equivalent Gain of its correspondence when making to be tested by different ultraviolet imager, to realize the research conclusion of a ultraviolet imager to be applied in other ultraviolet imagers, and accurately judge discharge severity and the insulating property thereof of electric insulation equipment with this.
Accompanying drawing explanation
Fig. 1 is the method for testing process flow diagram calibrated different ultraviolet imager testing result of the embodiment of the present invention.
Embodiment
Below contrast accompanying drawing and combine preferred embodiment the invention will be further described.
Gain in the present invention refers to that ultraviolet imager carries out amplifying a parameter of process multiple to the ultraviolet signal received, and detecting distance refers to the air line distance between the instrument camera lens of ultraviolet imager to point of discharge; The testing result of ultraviolet imager mainly comprises ultraviolet light subnumber and ultraviolet facula area, and ultraviolet light subnumber can directly directly read from the screen of ultraviolet imager, and ultraviolet facula area needs coding to extract from every two field picture of electric discharge video.
As shown in Figure 1, be the method for testing process flow diagram that different ultraviolet imager testing result is calibrated of the embodiment of the present invention, comprise the following steps:
S1: take gain as variable, other parameters are quantitatively, adopt the first ultraviolet imager to test under different gains standard testing object, obtain the first group test result of standard testing object under different gains;
S2: take gain as variable, other parameters are quantitatively, adopt the second ultraviolet imager to test under different gains standard testing object, obtain the second group test result of standard testing object under different gains;
S3: first group of test result and second group of test result are compared, determine the gain that the first ultraviolet imager and the second ultraviolet imager are corresponding respectively when obtaining equal or close test result, the gain of this correspondence is the Equivalent Gain of the first ultraviolet imager and the second ultraviolet imager, and wherein close test result is that exponential quantity difference is less than or equal to 5%;
S4: with first of the first ultraviolet imager group of test result for standard, employing second ultraviolet imager is carried out for actual tested object the result that the result of testing and the first ultraviolet imager carry out testing for standard testing object under the first yield value under the second yield value compare, wherein the first yield value and the second yield value are the Equivalent Gains of the first ultraviolet imager and the second ultraviolet imager.
Wherein, the first ultraviolet imager and the second ultraviolet imager are the different instruments of same model, and above-mentioned test result can be the test result of ultraviolet light subnumber or ultraviolet facula area.It is to be noted that the electric discharge of (1) electric insulation equipment is enough obvious and serious in test process: be reduce test error, ultraviolet light subnumber and the ultraviolet facula area of electric discharge generation are enough large, photon number at least will reach 103 orders of magnitude, preferably can reach 104 orders of magnitude; The area of ultraviolet hot spot wants naked eyes obviously can distinguish, preferably reach in picture the size of the sub-pieces that insulate, warranty test device can produce severe non-uniform electric field, and institute's making alive is enough high can meet the demands; (2) electric discharge of electric insulation equipment is enough stable: will ensure in test that strength of discharge is enough stable, the ultraviolet light subnumber of generation and the maximum fluctuation amplitude of ultraviolet facula area is made to maintain in 10% scope, if ultraviolet light subnumber and ultraviolet facula area undulatory property excessive, just can not distinguish that the change of its numerical value is due to undulatory property, or other influences factor, strengthen test device produce the unevenness of electric field, be conducive to the stability improving electric discharge; (3) the testing result numerical value of instrument record is abundant: under each gain parameter, require that the ultraviolet light subnumber of record more than 12 is grown up in the electric discharge video of 10s in time, by averaging as the photon numerical value under this parameter and facula area numerical value, this is also a kind of method reducing the interference of strength of discharge undulatory property, should be noted simultaneously and discharge in the initial 1 ~ 2s of video and ultraviolet light subnumber at record, instrument is also in an unsure state, therefore effective photon number and hot spot video all will be counted from after 2s.
In some embodiments, the first ultraviolet imager or the second ultraviolet imager is adopted specifically to comprise the step that standard testing object is tested: to select bar electrode and plate electrode to be test platform, plate electrode 3 ~ 5cm described in the distance between two tips of bar electrode, pressurization 10 ~ 15kV, the detecting distance of the first ultraviolet imager or the second ultraviolet imager is 4 ~ 10m.
In another part embodiment, the first ultraviolet imager or the second ultraviolet imager is adopted specifically to comprise the step that standard testing object is tested: to select insulator chain to be test platform, described insulator chain of often going here and there hangs 10 ~ 15 insulators, pressurization 200 ~ 400kV, the detecting distance of described first ultraviolet imager or described second ultraviolet imager is 20 ~ 50m.Wherein insulator can select dish-type glass insulator.
In some embodiments, the ultraviolet imager that the first ultraviolet imager and the second ultraviolet imager select Israel to produce, above-mentioned test tests from 40 to 180 for step-length with 10 in gain standard testing object.
Following in conjunction with example to calibration different ultraviolet imager testing result method of testing be described.
Example one (calibration of the testing result of the ultraviolet light subnumber of different ultraviolet imager):
First ultraviolet imager and the second ultraviolet imager all select Israel to produce DayCorSuperB model, test platform is bar electrode and plate electrode, the tip employing diameter of bar electrode is copper pin or the iron pin of 3mm, distance between two tips plate electrode 3 ~ 5cm, pressurization 10 ~ 15kV (by actual conditions adjustment), now the tip of bar electrode can produce relatively stable and significantly discharge, and the fluctuating range of photon number is in 10% scope, and clearance again can not be breakdown simultaneously.
Owing to being calibration test, suggestion carries out 4 groups, to reduce accidental error.The first ultraviolet imager and the second ultraviolet imager that need calibration are all placed on the same position of distance point of discharge 4 ~ 10m, adjustment instrument lens direction makes point of discharge be positioned at the centre of screen, is adjusted to maximum by ultraviolet photon counting frame.During battery of tests, gain from 40 with 10 for step-length increases to 180, record the ultraviolet light subnumber of more than 12 at each yield value place; Second group test time, gain from 180 with 10 for step-length is decreased to 40, record the photon number of more than 12 equally at each yield value place; Third and fourth group test repeats the step of first two groups, obtains 4 groups of test figures altogether.
Average as the ultraviolet photon numerical value under this gain for last 8 ~ 10 in the photon number sequence recorded under choosing each gain.The mean value of the 4 groups of ultraviolet photon numerical value asking the first ultraviolet imager and the second ultraviolet imager to obtain under each gain, as ultraviolet light subnumber final under this gain, obtain the photon number at all appts each yield value place in 40 ~ 180 scopes, contrast ultraviolet light subnumber and the yield value of the first ultraviolet imager and the second ultraviolet imager, as table 1.
The test result of the first ultraviolet imager under table 1 different gains value and the ultraviolet light subnumber of the second ultraviolet imager
If two instruments are under certain respective gain, the photon number be recorded to is equal or closely (its numerical value difference be less than or equal to 5%), thinks that these two yield values are of equal value in record ultraviolet light subnumber.As shown in table 1, namely the yield value of gain 50,60180 respectively with the second ultraviolet imager of the first ultraviolet imager is 40,50170 is corresponding, and also the ultraviolet light subnumber that is recorded to when yield value is 50 of the first ultraviolet imager and the second ultraviolet imager have comparability when yield value is 40.Such as, if the testing result of the first ultraviolet imager is GB, regulation detects that when the first ultraviolet imager is in gain 50 photon number is serious electric discharge more than 200, should be then detect that photon number is serious electric discharge more than 200 for 40 times in gain with the second ultraviolet imager, because the gain 40 of the gain of the first ultraviolet imager 50 and the second ultraviolet imager just has comparability when detecting photon number, the photon number that both detect respectively under corresponding Equivalent Gain is of equal value, has comparability.
This example utilizes bar electrode and plate electrode, severe non-uniform electric field is formed after pressurization, produce stable and obvious point of discharge, same position is fixed on by needing the ultraviolet imager of calibration, take gain as variable, simultaneously with the ultraviolet light subnumber under each yield value of all appts record, draw the change curve of ultraviolet light subnumber with gain of every platform instrument, contrast the curve of different ultraviolet imager, obtain the gain that different instrument is corresponding when observing formed objects ultraviolet light subnumber, be Equivalent Gain, lateral comparison can be carried out to the data of different ultraviolet imager after forming Equivalent Gain, the result caused with the difference problem eliminated between different instrument judges inaccuracy, thus judge discharge severity and the insulating property thereof of electric insulation equipment more exactly.
Example two (calibration of the ultraviolet hot spot area detecting result of different ultraviolet imager):
First ultraviolet imager and the second ultraviolet imager all select Israel to produce DayCorSuperB model, test platform is I type insulator chain, LXP-120 model compact disc glass insulator, often string suspension 10 ~ 15, pressurize about 300kV (be determined on a case-by-case basis and be arranged between 200 ~ 400kV), make insulator chain high-pressure side produce violent and stable point of discharge, the fluctuation ratio of facula area is in 10% scope.
Owing to being calibration test, suggestion carries out 4 groups, to reduce accidental error.The first ultraviolet imager and the second ultraviolet imager that need calibration are all fixed on the same position that distance insulator chain is about 30m, and adjustment instrument lens direction makes point of discharge be positioned at the centre of screen.During battery of tests, gain from 40 with 10 for step-length increases to 180, at the electric discharge video of each yield value place record more than 10s; Second group test time, gain from 180 with 10 for step-length is decreased to 40, record the electric discharge video of more than 10s equally at each yield value place; Third and fourth group test repeats the step of first two groups, obtains 4 groups of electric discharge videos altogether.
The mean value of the ultraviolet facula area of last 200 two field pictures in the electric discharge video recorded under calculating each gain (time be about 6s), as the facula area value under this gain.The mean value of 4 the ultraviolet hot spot area values asking the first ultraviolet imager and the second ultraviolet imager to obtain under each gain, as facula area final under this gain, obtain the facula area at the first ultraviolet imager and the second ultraviolet imager each yield value place in 40 ~ 180 scopes, contrast ultraviolet facula area and the gain data of different instrument, as table 2.
The test result of the first ultraviolet imager under table 2 different gains value and the ultraviolet facula area of the second ultraviolet imager
If two instruments are under certain respective gain, the ultraviolet facula area be recorded to is equal or closely (its numerical value difference be less than or equal to 5%), think that these two yield values are of equal value in record ultraviolet facula area, the ultraviolet facula area of its record just has comparability.As shown in table 2, the yield value of the first ultraviolet imager is the yield value of 60,70180 respectively with the second ultraviolet imagers be 40,50160 is corresponding, and also namely the ultraviolet facula area that is recorded to when yield value is 60 of the first ultraviolet imager and the second ultraviolet imager b have comparability when gain is 40.Such as, if the testing result of the first ultraviolet imager is GB, regulation detects that when the first ultraviolet imager is in gain 60 facula area is serious electric discharge more than 2000, should be then detect that facula area is serious electric discharge more than 2000 for 40 times in gain with the second ultraviolet imager, because the gain 40 of the gain of the first ultraviolet imager 60 and the second ultraviolet imager just has comparability when detecting facula area, the facula area that both detect respectively under corresponding Equivalent Gain is of equal value, has comparability.
The non-uniform electric field that this example is formed at high-pressure side after utilizing insulator chain to pressurize, produce stable and strong point of discharge, same position is placed on by needing the ultraviolet imager of calibration, take gain as variable, use the electric discharge video under all yield values under every platform instrument record simultaneously, the area of ultraviolet hot spot is extracted from video, draw the change curve of facula area with gain of every platform instrument, contrast the curve of different ultraviolet imager, obtain the yield value that different instrument is corresponding when observing onesize facula area, be Equivalent Gain, lateral comparison can be carried out to the data of different ultraviolet imager after forming Equivalent Gain, the result caused with the difference problem eliminated between different instrument judges inaccuracy, thus judge discharge severity and the insulating property thereof of electric insulation equipment more exactly.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For those skilled in the art, without departing from the inventive concept of the premise, some equivalent to substitute or obvious modification can also be made, and performance or purposes identical, all should be considered as belonging to protection scope of the present invention.
Claims (8)
1., to the method for testing that different ultraviolet imager testing result is calibrated, it is characterized in that, comprise the following steps:
S1: take gain as variable, other parameters are quantitatively, adopt the first ultraviolet imager to test under different gains standard testing object, obtain the first group test result of described standard testing object under different gains;
S2: take gain as variable, other parameters are quantitatively, adopt the second ultraviolet imager to test under different gains described standard testing object, obtain the second group test result of described standard testing object under different gains;
S3: described first group of test result and described second group of test result are compared, determine the gain that described first ultraviolet imager and described second ultraviolet imager are corresponding respectively when obtaining equal or close test result, the gain of this correspondence is the Equivalent Gain of described first ultraviolet imager and described second ultraviolet imager, and wherein close test result is that exponential quantity difference is less than or equal to 5%;
S4: with described first group of test result of described first ultraviolet imager for standard, under the second yield value, carry out the result that the result of testing and described first ultraviolet imager carry out testing for described standard testing object under the first yield value by adopting described second ultraviolet imager for actual tested object to compare, wherein said first yield value and described second yield value are the described Equivalent Gains of described first ultraviolet imager and described second ultraviolet imager.
2. method of testing according to claim 1, is characterized in that, described first group of test result and described second group of test result are all test results of ultraviolet light subnumber.
3. method of testing according to claim 1, is characterized in that, described first group of test result and described second group of test result are all test results of ultraviolet facula area.
4. method of testing according to claim 1, is characterized in that, adopts described first ultraviolet imager or described second ultraviolet imager specifically to comprise the step that described standard testing object is tested:
Select bar electrode and plate electrode to be test platform, plate electrode 3 ~ 5cm described in the distance between two tips of described bar electrode, pressurization 10 ~ 15kV, the detecting distance of described first ultraviolet imager or described second ultraviolet imager is 4 ~ 10m.
5. method of testing according to claim 1, is characterized in that, adopts described first ultraviolet imager or described second ultraviolet imager specifically to comprise the step that described standard testing object is tested:
Select insulator chain to be test platform, described insulator chain of often going here and there hangs 10 ~ 15 insulators, and pressurization 200 ~ 400kV, the detecting distance of described first ultraviolet imager or described second ultraviolet imager is 20 ~ 50m.
6. method of testing according to claim 1, is characterized in that, described insulator is dish-type glass insulator.
7. method of testing according to claim 1, is characterized in that, described first ultraviolet imager and described second ultraviolet imager are the different instruments of same model.
8. the method for testing according to any one of claim 1 to 7, is characterized in that, adopts described first ultraviolet imager or described second ultraviolet imager to test from 40 to 180 for step-length with 10 in gain standard testing object.
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| CN106997022A (en) * | 2017-05-08 | 2017-08-01 | 上海电力学院 | The detection means of ultraviolet partial discharge number of photons is compensated based on laser ranging |
| CN109143140A (en) * | 2018-07-23 | 2019-01-04 | 北方夜视技术股份有限公司 | Day, blind ultraviolet imager detected the caliberating device and scaling method of consistency |
| CN109407028A (en) * | 2018-11-29 | 2019-03-01 | 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 | A kind of ultraviolet standard source of hand-held |
| CN110261747A (en) * | 2019-07-10 | 2019-09-20 | 重庆大学 | Ultraviolet discharge detector bearing calibration and device based on standard discharging model |
| CN110988773A (en) * | 2019-12-19 | 2020-04-10 | 国网山西省电力公司电力科学研究院 | Verification comparison method of ultraviolet imager |
| CN110988772A (en) * | 2019-12-19 | 2020-04-10 | 国网山西省电力公司电力科学研究院 | Check-up comparison circuit of ultraviolet imager |
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| CN110261747B (en) * | 2019-07-10 | 2020-09-08 | 重庆大学 | Ultraviolet discharge detector correction method and device based on standard discharge model |
| CN110988773A (en) * | 2019-12-19 | 2020-04-10 | 国网山西省电力公司电力科学研究院 | Verification comparison method of ultraviolet imager |
| CN110988772A (en) * | 2019-12-19 | 2020-04-10 | 国网山西省电力公司电力科学研究院 | Check-up comparison circuit of ultraviolet imager |
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