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Method for detecting aging degree of zinc oxide lightning arrester resistor disc

A technology of aging degree and detection method, applied in the direction of measuring resistance/reactance/impedance, instruments, measuring devices, etc., can solve the problems of difficulty in measuring the aging degree of zinc oxide arrester resistors, unknown factory values, etc., and is suitable for industrial applications. , the effect of high anti-aging properties

Active Publication Date: 2014-06-25
XI AN JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] So far, people have carried out relevant research on the aging characteristics of zinc oxide arrester resistors, most of which focus on the overall electrical performance, but the factory value is unknown, which makes it more difficult to measure the aging degree of zinc oxide arrester resistors

Method used

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  • Method for detecting aging degree of zinc oxide lightning arrester resistor disc
  • Method for detecting aging degree of zinc oxide lightning arrester resistor disc
  • Method for detecting aging degree of zinc oxide lightning arrester resistor disc

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Select a new zinc oxide arrester resistor (marked as 1#) and a zinc oxide arrester resistor (marked as 2#) that has been subjected to 2000 consecutive 8 / 20μs lightning strikes. These two samples of zinc oxide arrester are from the same manufacturer products of the same model. The peak value of the lightning impulse current experienced by resistor 2# is the nominal discharge current value specified in GB11032-2010. The resistor 2# is in the mid-aging stage, and the leakage current is 28μA, which is greater than the factory value (6μA). Cut 1# and 2# of zinc oxide resistors to be tested, the cutting method is as follows figure 1 shown. figure 2 It is the dielectric spectrum of a slice at low temperature, and it can be observed that there are two loss peaks in the ε''~f characteristic curve. Calculated by the Arrhenius formula, for all slices of resistors 1# and 2#, the relaxation activation energy of the low-frequency loss peak and the high-frequency loss peak are abou...

Embodiment 2

[0042] The resistive sheet of the zinc oxide arrester that has been in operation for 5 years in the substation is selected for illustration. The resistor is in the early stage of aging, the leakage current is 10μA, U 1mA The value (5.03kV) is close to the factory value (5.02kV). Cut the zinc oxide resistor, the cutting method is as follows figure 1 shown.

[0043] Calculated by the Arrhenius formula, it can be known that the relaxation activation energies of the low-frequency loss peak and high-frequency loss peak of all slices are about 0.37eV and 0.22kV, respectively, corresponding to the intrinsic defects of oxygen vacancies and zinc interstitials.

[0044] Figure 5 It is the peak change of the oxygen vacancy loss peak and the zinc interstitial loss peak obtained by comparing the ε''~f curve of the slice at -100°C. It can be seen that the oxygen vacancy defect concentration in the resistance chip at the initial stage of aging is in the direction of current. monotonical...

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Abstract

A method for detecting the aging degree of a zinc oxide lightning arrester resistor disc includes the steps of averagely dividing the resistor disc to be detected into at least five equal parts in the direction perpendicular to the current direction, respectively testing dielectric properties of the cut disc bodies obtained in the last step, obtaining the change rules of dielectric constant imaginary parts epsilon'' changing according to the frequency f at different temperatures with the dielectric constant imaginary part epsilon'' of each cut disc body as a longitudinal coordinate and the frequency f as a transverse coordinate, calculating a loose activation energy value corresponding to each loss peak according to an Arrhenius formula, judging the defects corresponding to the loss peaks to be oxygen vacancy intrinsic defects and zinc interstitial intrinsic defects respectively according to the loose activation energy, comparing the dielectric spectrum epsilon''-f of each cut disc body at the temperature of 100 DEG C below zero with the peak value of the corresponding loss peak to obtain the distribution condition of the concentration of the oxygen vacancy intrinsic defects in the resistor disc in the current direction and the distribution condition of the concentration of the zinc interstitial intrinsic defects in the resistor disc in the current direction, and judging the aging degree of the resistor disc according to the change rate of the concentration of the zinc interstitial intrinsic defects. Through the method, the aging degree of the zinc oxide lightning arrester resistor disc can be more accurately detected from the micro perspective.

Description

【Technical field】 [0001] The invention belongs to the technical field of resistance plates of zinc oxide arresters, and in particular relates to a detection method for the aging degree of resistance plates of zinc oxide arresters. 【Background technique】 [0002] Zinc oxide varistor ceramics use zinc oxide as the main raw material, and add about 10% of additive raw materials as doping additives, such as Bi 2 o 3 、Co 2 o 3 (Co 3 o 4 ), MnO 2 (MnCO 3 ), Sb 2 o 3 , SiO 2 and Cr 2 o 3 etc., prepared by ceramic sintering process. Due to its good nonlinearity and large flow capacity, zinc oxide arresters have been widely used in power systems. Due to long-term exposure to working voltage and overvoltage, the performance of zinc oxide arrester resistors will gradually deteriorate or even fail. Therefore, effective evaluation of the aging degree of zinc oxide arrester resistors is a key issue in the practical application of zinc oxide arresters. [0003] So far, people ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/26
Inventor 李盛涛何锦强廖永力王辉高超蔺家骏李锐海
Owner XI AN JIAOTONG UNIV
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