CN103884918B - A kind of detection method for Zinc-Oxide Arrester resistor disc degree of aging - Google Patents
A kind of detection method for Zinc-Oxide Arrester resistor disc degree of aging Download PDFInfo
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- CN103884918B CN103884918B CN201410085336.2A CN201410085336A CN103884918B CN 103884918 B CN103884918 B CN 103884918B CN 201410085336 A CN201410085336 A CN 201410085336A CN 103884918 B CN103884918 B CN 103884918B
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Abstract
A kind of detection method for Zinc-Oxide Arrester resistor disc degree of aging, including step: testing resistance sheet edge is perpendicular to the sense of current and is at least on average cut into 5 equal portions；The dielectric properties of some sections that the upper step of test obtains respectively；With the imaginary part of dielectric constant ε of each section for vertical coordinate, frequency f is abscissa, obtain imaginary part of dielectric constant ε at different temperatures with the Changing Pattern of frequency f, calculate, by Arrhenius formula, the lax activation energy that each loss peak is corresponding, judge that the defect that loss peak is corresponding is Lacking oxygen and zinc calking intrinsic defect respectively by lax activation energy；Each section dielectric spectra ε～f at-100 DEG C is carried out loss peak peak value contrast, obtain Lacking oxygen and two kinds of intrinsic defect concentration of zinc calking distribution situation in the flow direction in resistor disc, judge the degree of aging size of resistor disc according to the rate of change of zinc interstitial defect concentration.The degree of aging of Zinc-Oxide Arrester resistor disc can be detected by the present invention more exactly from microcosmic angle.
Description
[technical field]
The invention belongs to Zinc-Oxide Arrester resistor disc technical field, particularly to a kind of detection method for Zinc-Oxide Arrester resistor disc degree of aging.
[background technology]
Zinc oxide pressure-sensitive ceramic is with zinc oxide for primary raw material, and the additive raw material of interpolation about 10% is as admixed with additives, such as Bi2O3、Co2O3(Co3O4)、MnO2(MnCO3)、Sb2O3、SiO2And Cr2O3Deng, adopt ceramic sintering process to be prepared from.Due to the advantage of its good non-linear and big discharge capacity, Zinc-Oxide Arrester is widely applied in power system.Owing to bearing running voltage and overvoltage effect for a long time, the performance of Zinc-Oxide Arrester resistor disc can occur deterioration even to lose efficacy gradually, and therefore the degree of aging of effective evaluation Zinc-Oxide Arrester resistor disc is the key issue in Zinc-Oxide Arrester practical application.
So far, the aging characteristics of Zinc-Oxide Arrester resistor disc have been carried out correlational study by people, and the research of piece electrical performance is laid particular stress in most researchs, but the not quite clear situation of factory-said value happens occasionally so that the measurement of Zinc-Oxide Arrester resistor disc degree of aging is increasingly difficult.
[summary of the invention]
It is an object of the invention to overcome the deficiencies in the prior art, it is provided that a kind of detection method for Zinc-Oxide Arrester resistor disc degree of aging.
For reaching above-mentioned purpose, the present invention adopts the following technical scheme that
A kind of detection method for Zinc-Oxide Arrester resistor disc degree of aging, comprises the following steps:
1) testing resistance sheet edge is perpendicular to the sense of current and is at least on average cut into 5 equal portions, obtain several sections being parallel on the sense of current；
2) respectively testing procedure 1) dielectric properties of some sections that obtain, wherein, when temperature range is-130 DEG C～40 DEG C, from low temperature to high temperature, with 10 DEG C for an interval, each section is carried out one-shot measurement, and at same temperature, frequency range is 10-1Hz～106Hz, carries out one-shot measurement with 1.5 times of ratios successively decreased to each section from high frequency to low frequency；
3) by step 2) data measured that obtains, imaginary part of dielectric constant ε with each section " for vertical coordinate; frequency f is abscissa; obtain imaginary part of dielectric constant ε " at different temperatures with the Changing Pattern of frequency f, calculate, by Arrhenius formula, the lax activation energy that each loss peak is corresponding, judge that the defect that loss peak is corresponding is Lacking oxygen and zinc calking intrinsic defect respectively by lax activation energy；
4) to each section dielectric spectra ε at-100 DEG C "～f carries out loss peak peak value contrast, obtain Lacking oxygen and two kinds of intrinsic defect concentration of zinc calking distribution situation in the flow direction in resistor disc, rate of change k according to zinc interstitial defect concentration judges the degree of aging size of Zinc-Oxide Arrester resistor disc, wherein, when 0 < k≤20%, Zinc-Oxide Arrester resistor disc is in the aging initial stage, when 20 < k≤100%, Zinc-Oxide Arrester resistor disc is in aging mid-term, as k > 100%, Zinc-Oxide Arrester resistor disc is in the aging later stage.
The present invention further improvement is that, step 1) in, with distilled water or ethanol for cleanout fluid after each section is polished, clean 6～7 times with ultrasonic washing instrument, each 15min；After section being dried at 80 DEG C, metal spraying electrode is in order to test.
The present invention further improvement is that, step 3) in, the computing formula of lax activation energy u is as follows:
In formula: fmBeing the frequency that lax loss peak is corresponding, unit is Hz；
T is absolute temperature, and unit is K；
τ0It it is temperature independent constant；
U is lax activation energy, and unit is eV；
K is Boltzmann constant, and value is 1.381 × 10-23J/K。
Compared with prior art, the method have the advantages that
The present invention analyzes the aging characteristics on its internal current direction by cutting resistor disc, and compared with traditional overall performance research, the present invention can more effectively judge the degradation of resistor disc.Specifically, the deterioration of Zinc-Oxide Arrester resistor disc is a kind of crystal boundary phenomenon, it it is the result of depletion layer intermediate ion migration, therefore the present invention judges the degree of aging of resistor disc according to the change rate of concentration of zinc calking intrinsic defect on zinc oxide resistance sheet internal current direction, the degree of aging of zinc oxide resistance sheet can be detected by this detection method more exactly from microcosmic angle, thus instructing the preparation technology of zinc oxide pressure-sensitive ceramic, this material is made to have higher ageing resistace and be more suitable for commercial Application.
[accompanying drawing explanation]
Fig. 1 is the cutting mode schematic diagram of Zinc-Oxide Arrester resistor disc；
Fig. 2 is a certain section dielectric spectra at low temperatures；
Fig. 3 is the Lacking oxygen loss peak peak change with zinc calking loss peak of new zinc oxide resistance sheet section；
Fig. 4 is the peak change of Lacking oxygen loss peak and the zinc calking loss peak standing a certain zinc oxide resistance sheet section after 2000 continuous thunder and lightnings impact；
Fig. 5 be actual motion after 5 years a certain zinc oxide keep away the peak change of Lacking oxygen loss peak and the zinc calking loss peak of resistor disc section.
[detailed description of the invention]
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Referring to Fig. 1 to Fig. 5, a kind of detection method for Zinc-Oxide Arrester resistor disc degree of aging of the present invention, comprise the following steps:
1) testing resistance sheet edge is perpendicular to the sense of current and is at least on average cut into 5 equal portions, obtain several sections being parallel on the sense of current, as shown in Figure 1；It should be noted that with distilled water or ethanol for cleanout fluid after section is polished, clean 6～7 times with ultrasonic washing instrument, each 15min；After section being dried at 80 DEG C, metal spraying electrode is in order to test, it is noted that guarantee that the size and location of institute's jet electrode is consistent in each section during by electrode.
2) respectively testing procedure 1) dielectric properties of some sections that obtain, wherein, when temperature range is-130 DEG C～40 DEG C, from low temperature to high temperature, with 10 DEG C for an interval, each section is carried out one-shot measurement, and at same temperature, frequency range is 10-1Hz～106Hz, carries out one-shot measurement with 1.5 times of ratios successively decreased to each section from high frequency to low frequency；
3) by step 2) data measured that obtains, imaginary part of dielectric constant ε with each section " for vertical coordinate; frequency f is abscissa; obtain imaginary part of dielectric constant ε " at different temperatures with the Changing Pattern of frequency f, the lax activation energy that each loss peak is corresponding is calculated by Arrhenius formula, the value that wherein Frequency Power Loss peak and high-frequency loss peak are corresponding respectively is 0.20～0.26eV, 0.31～0.39eV, judge that the defect that loss peak is corresponding is Lacking oxygen and zinc calking intrinsic defect respectively by lax activation energy, as shown in Figure 2；Wherein, the computing formula of lax activation energy u is as follows:
In formula: fmBeing the frequency that lax loss peak is corresponding, unit is Hz；
T is absolute temperature, and unit is K；
τ0It it is temperature independent constant；
U is lax activation energy, and unit is eV；
K is Boltzmann constant, and value is 1.381 × 10-23J/K。
4) to each section dielectric spectra ε at-100 DEG C "～f contrasts, obtain the ε of different section Lacking oxygen loss peak and zinc calking loss peak " peak strength, draw Lacking oxygen loss peak and the ε of zinc calking loss peak " peak strength change curve in the flow direction, obtain Lacking oxygen and two kinds of intrinsic defect concentration of zinc calking distribution situation in the flow direction in resistor disc, the degree of aging size of Zinc-Oxide Arrester resistor disc is judged according to zinc interstitial defect concentration rate of change k in the flow direction, wherein, when 0 < k≤20%, Zinc-Oxide Arrester resistor disc is in the aging initial stage, when 20 < k≤100%, Zinc-Oxide Arrester resistor disc is in aging mid-term, as k > 100%, Zinc-Oxide Arrester resistor disc is in the aging later stage, as shown in Figures 3 to 5.
Embodiment 1:
Zinc-Oxide Arrester resistor disc (being designated as 2#) after choosing new Zinc-Oxide Arrester resistor disc (being designated as 1#) and standing 2000 continuous 8/20 μ s lightning impulses, both zinc oxide resistance sheet samples are the same type product of same producer.The lightning impulse current peak value that resistor disc 2# stands is the GB11032-2010 nominal discharge current value specified, resistor disc 2# is in aging mid-term, and leakage current is 28 μ A, more than factory-said value (6 μ A).Treating survey zinc oxide resistance sheet 1# and 2# to cut, cutting mode is as shown in Figure 1.Fig. 2 is a certain section dielectric spectra at low temperatures, and ε be can be observed "～f characteristic curve two loss peaks of existence.Being calculated by Arrhenius formula, all sections to resistor disc 1# and 2#, the lax activation energy at Frequency Power Loss peak and high-frequency loss peak respectively may be about 0.35eV and 0.21kV, correspond to Lacking oxygen and zinc calking intrinsic defect.
Fig. 3 is section ε at-100 DEG C of contrast resistor disc 1# " peak change of the Lacking oxygen loss peak that obtains of～f curve and zinc calking loss peak, it can be seen that before aging, in resistor disc, the concentration of Lacking oxygen defect and zinc interstitial defect is in the flow direction without significant change.Fig. 4 is section ε at-100 DEG C of contrast resistor disc 2# " peak change of the Lacking oxygen loss peak that obtains of～f curve and zinc calking loss peak; can be seen that aging mid-term; in resistor disc, the concentration of Lacking oxygen and zinc calking intrinsic defect is in the flow direction in monotone variation rule, and the change rate of concentration of zinc interstitial defect is 98%.Comparison diagram 3 and Fig. 4 are it can be seen that the change of zinc interstitial defect concentration can reflect the degree of aging of resistor disc.
Embodiment 2:
It is chosen at transformer station's actual motion Zinc-Oxide Arrester resistor disc of 5 years to illustrate.This resistor disc is in the aging initial stage, and leakage current is 10 μ A, U1mAValue (5.03kV) is close with factory-said value (5.02kV).This zinc oxide resistance sheet is cut, and cutting mode is as shown in Figure 1.
Calculated by Arrhenius formula, it is known that the Frequency Power Loss peak of all sections and the lax activation energy at high-frequency loss peak respectively may be about 0.37eV and 0.22kV, correspond to Lacking oxygen and zinc calking intrinsic defect.
Fig. 5 is contrast section ε at-100 DEG C " peak change of the Lacking oxygen loss peak that obtains of～f curve and zinc calking loss peak; can be seen that in the resistor disc at this aging initial stage, Lacking oxygen defect density increases in dullness in the flow direction; and zinc interstitial defect change rate of concentration less (14.3%), this was consistent with " resistor disc is in the aging initial stage " the fact.More than implement to will assist in those skilled in the art and be further appreciated by the present invention, but do not limit the present invention in any form.It should be pointed out that, to those skilled in the art, without departing from the inventive concept of the premise, it is also possible to make some deformation and improvement.These broadly fall into protection scope of the present invention.
Claims (3)
1. the detection method for Zinc-Oxide Arrester resistor disc degree of aging, it is characterised in that comprise the following steps:
1) testing resistance sheet edge is perpendicular to the sense of current and is at least on average cut into 5 equal portions, obtain several sections being parallel on the sense of current；
2) respectively testing procedure 1) dielectric properties of some sections that obtain, wherein, when temperature range is-130 DEG C～40 DEG C, from low temperature to high temperature, with 10 DEG C for an interval, each section is carried out one-shot measurement, and at same temperature, frequency range is 10-1Hz～106Hz, carries out one-shot measurement with 1.5 times of ratios successively decreased to each section from high frequency to low frequency；
3) by step 2) data measured that obtains, imaginary part of dielectric constant ε with each section " for vertical coordinate; frequency f is abscissa; obtain imaginary part of dielectric constant ε " at different temperatures with the Changing Pattern of frequency f, calculate, by Arrhenius formula, the lax activation energy that each loss peak is corresponding, judge that the defect that loss peak is corresponding is Lacking oxygen and zinc calking intrinsic defect respectively by lax activation energy；
4) to each section dielectric spectra ε at-100 DEG C "～f carries out loss peak peak value contrast, obtain Lacking oxygen and two kinds of intrinsic defect concentration of zinc calking distribution situation in the flow direction in resistor disc, i.e. loss peak peak value distribution situation in the flow direction, rate of change k according to zinc interstitial defect concentration judges the degree of aging size of Zinc-Oxide Arrester resistor disc, wherein, when 0 < k≤20%, Zinc-Oxide Arrester resistor disc is in the aging initial stage, when 20 < k≤100%, Zinc-Oxide Arrester resistor disc is in aging mid-term, as k > 100%, Zinc-Oxide Arrester resistor disc is in the aging later stage.
2. a kind of detection method for Zinc-Oxide Arrester resistor disc degree of aging according to claim 1, it is characterized in that, step 1) in, with distilled water or ethanol for cleanout fluid after each section is polished, clean 6～7 times with ultrasonic washing instrument, each 15min；After section being dried at 80 DEG C, metal spraying electrode is in order to test.
3. a kind of detection method for Zinc-Oxide Arrester resistor disc degree of aging according to claim 1, it is characterised in that step 3) in, the computing formula of lax activation energy u is as follows:
In formula: fmBeing the frequency that lax loss peak is corresponding, unit is Hz；
T is absolute temperature, and unit is K；
τ0It it is temperature independent constant；
U is lax activation energy, and unit is eV；
K is Boltzmann constant, and value is 1.381 × 10-23J/K。
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| CN104792824B (en) * | 2015-04-15 | 2017-10-31 | 西安工程大学 | Thermoelectric force current methods for the ceramic defects detections of ZnO |
| CN106546864A (en) * | 2016-09-23 | 2017-03-29 | 清华大学 | A kind of variable temperature measurement device of simple ZnO resistors valve block electric parameter |
| CN109164302A (en) * | 2018-09-04 | 2019-01-08 | 西安交通大学 | A kind of prediction technique of Zinc-Oxide Arrester resistor disc direct current aging life-span |
| CN109709426B (en) * | 2018-12-29 | 2021-08-20 | 国家电网有限公司 | Large-capacity resistance sheet column current distribution test method and device for MOV |
| DE102019205226B4 (en) * | 2019-04-11 | 2022-10-20 | Phoenix Contact Gmbh & Co. Kg | Method for determining type-dependent aging data of arresters for at least two different initial temperatures, and method for determining the aging of an arrester with an aging determination device, and arrester with an aging determination device |
| CN112326736B (en) * | 2020-10-23 | 2021-10-01 | 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 | Nondestructive testing method for zinc oxide arrester valve plate |
| CN112881938B (en) * | 2021-01-11 | 2021-09-24 | 西南交通大学 | Lightning arrester life indication test evaluation method in severe high-temperature environment |
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