CN103743968B - Multiple lightning current tolerance test method for metal oxide lightning arrester - Google Patents
Multiple lightning current tolerance test method for metal oxide lightning arrester Download PDFInfo
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- 229910044991 metal oxide Inorganic materials 0.000 title claims abstract description 24
- 150000004706 metal oxides Chemical class 0.000 title claims abstract description 24
- 238000010998 test method Methods 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 18
- 238000012360 testing method Methods 0.000 claims abstract description 17
- 238000009863 impact test Methods 0.000 claims description 9
- 238000002441 X-ray diffraction Methods 0.000 claims description 6
- 238000004458 analytical method Methods 0.000 claims description 6
- 238000002329 infrared spectrum Methods 0.000 claims description 5
- 208000027418 Wounds and injury Diseases 0.000 claims description 3
- 239000002537 cosmetic Substances 0.000 claims description 3
- 230000006378 damage Effects 0.000 claims description 3
- 208000014674 injury Diseases 0.000 claims description 3
- 230000002950 deficient Effects 0.000 claims description 2
- 238000005259 measurement Methods 0.000 claims description 2
- 230000002085 persistent effect Effects 0.000 claims description 2
- APTZNLHMIGJTEW-UHFFFAOYSA-N pyraflufen-ethyl Chemical compound C1=C(Cl)C(OCC(=O)OCC)=CC(C=2C(=C(OC(F)F)N(C)N=2)Cl)=C1F APTZNLHMIGJTEW-UHFFFAOYSA-N 0.000 description 6
- 238000004088 simulation Methods 0.000 description 5
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000004224 protection Effects 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 2
- 239000011787 zinc oxide Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
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- Testing Electric Properties And Detecting Electric Faults (AREA)
- Testing Relating To Insulation (AREA)
Abstract
A method of multiple lightning current withstand testing of a metal oxide arrester, the method comprising the steps of: selecting a valve plate and recording a test environment; recording various performances of the valve plate before the test; determining a parameter for applying multiple lightning currents; recording a test process of applying multiple lightning current impacts on the valve plate; measuring various performances of the valve plate after the test; the valve plate was evaluated for its ability to withstand multiple lightning current surges. The multiple lightning current tolerance test method for the metal oxide lightning arrester can simulate the conditions of the lightning arrester under the action of actual lightning current including first lightning current, subsequent lightning current and middle long-time lightning current, and is feasible.
Description
Technical field
The present invention relates to metal oxide arrester experimental technique, especially relate to a kind of multiple lightning current resistance test method of metal oxide arrester.
Background technology
Spark gap is a large amount of effective lightning protection measures adopted on distribution line, owing to it installs the reasons such as quantity is many, have a very wide distribution, its life appraisal, test method, O&M scheme are always up the difficult problem that domestic and international power system O&M, state evaluation and asset management face.Domestic and international operating experience shows; thunderbolt itself is to cause the topmost reason of distribution line surge arrester failure, the key issue that spark gap characteristic under actual lightning current impacts faces in being its running status assessment, test method, protected effect and fit system etc..Domestic and international thunder observation shows, the thunderbolt of more than 70% is multiple thunderbolt, considers that multiple thunder-strike current impacts the test method of tolerance and equipment is only capable of carrying out the simulation of pulse in the outer circuit test of lightning arrester standard of Present Domestic.Such as, for 1～52kV spark gap of strong thunder and lightning density region nominal discharge current 20kA in " GB11032-2010 alternating current gapless metal oxide arrester " standard, test product adopts the dash current preparation property test of 4 groups of (often group five times) 8/20 μ s dash current ripple nominal discharge currents and the 30/80 μ s dash current ripple that interval is 50～60s, and spark gap lightning current tolerance is tested for 3 times by 40kA dash current；For arrester with gaps in " DL/T815-2012 transmission line of alternation current polymeric metal oxide surge arrester " standard, when considering the energy of multiple thunderbolt, on the basis tolerated by the heavy current impact of 4/10 μ s dash current ripple, its proportional unit (or resistor disc) should be able to tolerate 2ms rectangular impulse current 18 times, and defines different rectangular impulse current amplitudes according to different nominal voltage of a system.These test methods are only capable of carrying out the simulation of pulse, and repeatedly the minimum interval of repeated trials is 10s, much larger than the interval of actual multiple thunderbolt, it is impossible to simulate electric power and heat effect accumulation that actual multiple thunderbolt causes.Owing to the impact of znr is had accumulative effect by dash current; the multiple current that interval time is ms level even μ s level impacts obviously much harsh than single rush of current; therefore some zinc oxide overvoltage protections having passed through single-impact current testing often occur impact aging to destroy in actual use; do not reach the purpose of overvoltage protection, even caused systematic failures by faults itself.
Summary of the invention
In order to overcome the deficiency of existing test method, the present invention provides a kind of multiple lightning current resistance test method of metal oxide arrester, the method can simulate the impact on metal oxide arrester of the actual multiple lightning current, in order to examine the metal oxide arrester tolerance to multiple lightning current.
The technical solution of the present invention is as follows:
A kind of multiple lightning current resistance test method of metal oxide arrester, it is characterized in that the method comprises the following steps:
1. the air pressure of recording laboratory environment, temperature, humidity, select the valve block of a collection of metal oxide arrester for testing；
2. measure described valve block residual voltage under nominal discharge current and direct-current reference current is DC reference voltage during 1mA or 2mA, the result that record valve block X-ray diffraction analysis or infrared spectrum analysis or ultrasonic scanning are analyzed, the outward appearance photo of record valve block；
3. the thunder-strike current first, the amplitude of the long-time thunder-strike current of follow-up thunder-strike current and centre, applying number of times, order and the interval that described valve block are applied multiple lightning current and impacts are determined；
4. 3. described valve block being applied multiple lightning current by step to impact, record valve block, by electric current and the amplitude of valve plate residual voltage, waveform, interval, adopts high-speed camera or thermal infrared imager to record multiple lightning current and impacts the process of valve block；
5. as to valve block stop multiple lightning current impact test, then enter step 6., otherwise change again valve block repeat step 3.～step 4.；
6. the method in " GB11032-2010 alternating current gapless metal oxide arrester " standard is adopted, measuring through residual voltage under nominal discharge current of the valve block of multiple lightning current impact test and direct-current reference current is the DC reference voltage of 1mA or 2mA, records the result analyzed through the valve block X-ray diffraction analysis of multiple lightning current impact test or infrared spectrum analysis or ultrasonic scanning；
7. comparison step 2. with step measurement result 6., when after test the residual voltage under valve block nominal discharge current and direct-current reference current be DC reference voltage during 1mA or 2mA vary more than test before the former reference voltage of valve block-2%～+5% scope, or there is obvious cosmetic injury in valve block, then is judged to that valve block is defective.
The waveform of described thunder-strike current first is 10/350 μ s dash current ripple, 8/20 μ s dash current ripple, 4/10 μ s dash current ripple or 30/80 μ s dash current ripple, the described waveform simulating follow-up thunder-strike current only requires the wave head dash current ripple at 0.25～4 μ s, and in the middle of described simulation, the waveform of long-time thunder-strike current adopts the persistent period square wave less than 10ms.
Compared with existing test method, the beneficial effects of the present invention is:
The metal oxide arrester multiple lightning current resistance test method that the present invention proposes can simulate actual lightning current and include the situation of spark gap under thunder-strike current first, follow-up thunder-strike current, centre thunder-strike current effect for a long time, and test method is practical.
Accompanying drawing explanation
Fig. 1 is metal oxide arrester multiple lightning current resistance test embodiment of the method flow chart.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, the inventive method being elaborated, the present embodiment is implemented by technical solution of the present invention, gives detailed embodiment and detailed process, but protection scope of the present invention is not limited to this embodiment.
Implement such as Fig. 1,
The multiple lightning current resistance test method of metal oxide arrester of the present invention, said method comprising the steps of:
Step 1: recording laboratory ambient pressure is 102kPa, temperature is 25 DEG C, humidity is 9g/m3, selects 20 valve blocks for 10kV zinc oxide leakage conductor, its 8/20 μ s dash current ripple nominal discharge current is 5kA, diameter is 35mm, be highly 30mm, 2ms square wave discharge capacity is 150A.
Step 2: adopt the method in " GB11032-2010 alternating current gapless metal oxide arrester " standard, the residual voltage measured under valve block nominal discharge current is 10kV, direct-current reference current is DC reference voltage during 1mA is 6kV, the result that before record test, valve block X-ray diffraction analysis and ultrasonic scanning are analyzed, the outward appearance photo of record valve block.
Step 3: adopt multiples impacts current feedback circuit, determine that the applying applying each component that multiple lightning current impacts order is for once simulating long-time thunder-strike current in the middle of the simulation of the follow-up thunder-strike current of thunder-strike current → once simulate → once first → once simulate follow-up thunder-strike current, simulating thunder-strike current waveform first is 10/350 μ s dash current ripple, amplitude is 20kA, simulating follow-up thunder-strike current waveform is 1/10 μ s dash current ripple, amplitude is 10kA, in the middle of simulation, long-time thunder-strike current waveform is 5ms square wave, amplitude is 500A, the interval of each dash current is 35ms.
Step 4: valve block is applied multiple lightning current and impacts, record valve block, by electric current and the amplitude of valve plate residual voltage, waveform, interval, adopts high-speed camera or thermal infrared imager to record multiple lightning current and impacts the process of valve block.
Step 5: change valve block and repeat step 3～step 4 and carry out next step after totally 20 times.
Step 6: adopt the method in " GB11032-2010 alternating current gapless metal oxide arrester " standard, measure the residual voltage under the valve block nominal discharge current of multiple lightning current impact test and direct-current reference current is the DC reference voltage of 1mA or 2mA, record the result of the valve block X-ray diffraction analysis through multiple lightning current impact test or infrared spectrum analysis or ultrasonic scanning analysis.
Step 7: relatively the residual voltage under valve block nominal discharge current before and after multiple lightning current impact test, direct-current reference current are the appearance characteristics of DC reference voltage during 1mA or 2mA and valve block, analyze multiple lightning current and impact the impact on valve block, evaluate valve block and tolerate the ability that multiple lightning current impacts.
In described step 7, method in " GB11032-2010 alternating current gapless metal oxide arrester " standard of employing, before and after experiment with measuring the residual voltage under valve block nominal discharge current and direct-current reference current be during 1mA or 2mA DC reference voltage change if it exceeds former reference voltage-2% or+5%, or there is obvious cosmetic injury in valve block, then it is assumed that valve block lost efficacy.
Should be noted that: above example is only in order to illustrate that technical scheme is not intended to limit, although the present invention being described in detail with reference to above-described embodiment, those of ordinary skill in the field are it is understood that still can modify to the specific embodiment of the present invention or equivalent replacement, and without departing from any amendment of spirit and scope of the invention or equivalent replace, it all should be encompassed in the middle of scope of the presently claimed invention.
Claims (2)
1. the multiple lightning current resistance test method of metal oxide arrester, it is characterised in that the method comprises the following steps:
1. the air pressure of recording laboratory environment, temperature, humidity, select the valve block of a collection of metal oxide arrester for testing；
2. measure described valve block residual voltage under nominal discharge current and direct-current reference current is DC reference voltage during 1mA or 2mA, the result that record valve block X-ray diffraction analysis or infrared spectrum analysis or ultrasonic scanning are analyzed, the outward appearance photo of record valve block；
3. the thunder-strike current first, the amplitude of the long-time thunder-strike current of follow-up thunder-strike current and centre, applying number of times, order and the interval that described valve block are applied multiple lightning current and impacts are determined；
4. 3. described valve block being applied multiple lightning current by step to impact, record valve block, by electric current and the amplitude of valve plate residual voltage, waveform, interval, adopts high-speed camera or thermal infrared imager to record multiple lightning current and impacts the process of valve block；
5. as to valve block stop multiple lightning current impact test, then enter step 6., otherwise change again valve block repeat step 3.～step 4.；
6. the method in " GB11032-2010 alternating current gapless metal oxide arrester " standard is adopted, measuring through residual voltage under nominal discharge current of the valve block of multiple lightning current impact test and direct-current reference current is the DC reference voltage of 1mA or 2mA, records the result analyzed through the valve block X-ray diffraction analysis of multiple lightning current impact test or infrared spectrum analysis or ultrasonic scanning；
7. comparison step 2. with step measurement result 6., when after test the residual voltage under valve block nominal discharge current and direct-current reference current be DC reference voltage during 1mA or 2mA vary more than test before the former reference voltage of valve block-2%～+5% scope, or there is obvious cosmetic injury in valve block, then is judged to that valve block is defective.
2. the multiple lightning current resistance test method of metal oxide arrester according to claim 1, it is characterized in that the waveform of described thunder-strike current first is 10/350 μ s dash current ripple, 8/20 μ s dash current ripple, 4/10 μ s dash current ripple or 30/80 μ s dash current ripple, the waveform of described follow-up thunder-strike current is the dash current ripple only requiring wave head at 0.25～4 μ s, and the waveform of the long-time thunder-strike current in described centre adopts the persistent period square wave less than 10ms.
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| CN107037337A (en) * | 2017-04-25 | 2017-08-11 | 四川诺特科技有限公司 | Arrester simulates the test system of true environment |
| CN107037289B (en) * | 2017-05-04 | 2019-11-08 | 南方电网科学研究院有限责任公司 | Method and system for determining nominal discharge current of power station lightning arrester |
| CN107728016B (en) * | 2017-09-05 | 2020-01-31 | 国网上海市电力公司 | surge protector multiple lightning current action load test method |
| CN110161304B (en) * | 2019-05-27 | 2021-07-06 | 国网浙江省电力有限公司电力科学研究院 | Method for calculating absorbed energy and residual voltage of line arrester under action of multiple lightning |
| CN110887876B (en) * | 2019-11-15 | 2021-07-27 | 上海交通大学 | Method for detecting lightning damage of carbon fiber composite laminated plate |
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| CN115166449B (en) * | 2022-08-11 | 2024-07-23 | 云南电网有限责任公司电力科学研究院 | Zinc oxide valve plate performance evaluation method and system |
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