CN104330650B - One kind is based on circuital Zinc-Oxide Arrester group charged test method - Google Patents
One kind is based on circuital Zinc-Oxide Arrester group charged test method Download PDFInfo
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Abstract
One kind is based on circuital Zinc-Oxide Arrester group charged test method, comprises the following steps：S1）DATA REASONING：By the electric current on the ground lead of each Zinc-Oxide Arrester in synchronous measuring apparatus synchro measure Zinc-Oxide Arrester group, the total current of A, B, C three-phase is obtained, and switchs to data signal storage；S2）Data processing：Above-mentioned data are handled using fast Fourier algorithm, the circuital phase angle of A, B, C three-phase of measurement is calculated, obtains the circuital angle of three-phase；S3）Multilevel iudge：The statistics of the circuital angle data of this three-phase phase total current angle corresponding with the Zinc-Oxide Arrester group before is sequentially arranged, the variable quantity of this correspondence phase total current angle compared with previous and the absolute deviation of this three-phase total current angle are calculated, is taken measures according to the absolute deviation or the variable quantity.The implementation of the method for the present invention powered can proceed without power failure, the reliability for not influenceing power plant to power.
Description
Technical field
Circuital Zinc-Oxide Arrester group charged test method is based on the present invention relates to one kind.
Background technology
Zinc-Oxide Arrester is a kind of important overvoltage protection, is the powerful guarantee of safe operation of power system.
Zinc-Oxide Arrester has the advantages that excellent non-linear and big discharge capacity, the extensive use in power network due to it.In three-phase
In AC system, each one of ABC three-phases constitute Zinc-Oxide Arrester group.
Zinc-Oxide Arrester operationally occurs that built-in electrical insulation makes moist and the defect such as valve block aging, influence electric power safety life
Production determines whether its working condition is good, it is necessary to periodically carry out preventive trial.
Current Zinc-Oxide Arrester preventive trial is generally required to be carried out under power-off condition, as Large Copacity is extensive
The construction of power plant, and high pressure, ultra high-tension transmission line and the number of transformer station are increasing, Zinc-Oxide Arrester in power system
Quantity gradually increases, and interruption maintenance workload is increasing.And continuing to develop with national economy, power supply reliability is wanted
More and more higher is sought, interruption maintenance is increasingly difficult to carry out, the development of live testing is imperative.
Zinc oxide lightning arrester live-line test, show its huge advantage, it is to avoid the test period in usual performulation
Interval time is long, and prerun experiment application voltage is relatively low, and experimental condition differs larger shortcoming with running status.
Current lightning arrester live-line test is based primarily upon two factors of system voltage and total current.Mainly measurement arrester is complete
The voltage of electric current and correspondence phase, calculates capacitive component, resistive component, then judges Zinc-Oxide Arrester state.Kept away from zinc oxide
Total current is measured at thunder device ground lead, voltage signal is obtained from the metering terminal of system voltage transformer, or obtain maintenance
Supply voltage is measured and calculated as voltage signal.
Circuital measurement is relatively easy, but the accurate acquisition of system voltage signal is always a problem, because right
In three-phase alternating current system, there is interphase interference in A, B, C phase, as shown in figure 1, the total current of any one phase can all be present in A, B, C
The capacity current that other two-phase Space Couplings come, the current in resistance property calculated using single phase voltage value and capacity current meeting
There is deviation；It is more complicated when directly taking voltage signal from voltage transformer simultaneously, and there is certain risk.
Therefore, present measuring method has certain inaccuracy, while metering system is more complicated.
The content of the invention
The technical problems to be solved by the invention are：There is provided it is a kind of independent of system voltage measure based on circuital
Zinc oxide lightning arrester live-line test method, this method can be realized to different voltage class in three-phase alternating current power transmission and transformation system, no
Zinc-Oxide Arrester group with capacity carries out live testing and state analysis, to judge inside Zinc-Oxide Arrester with the presence or absence of exhausted
Edge makes moist and the defect such as valve block aging provides the foundation referred to.
The present invention solves its technical problem by following technical solution：One kind is based on circuital Zinc-Oxide Arrester group band
Electric test method：
S1) DATA REASONING：Pass through each Zinc-Oxide Arrester in synchronous measuring apparatus synchro measure Zinc-Oxide Arrester group
Electric current on ground lead, obtains the total current of A, B, C three-phase, and switchs to data signal storage；
S2) data processing：Above-mentioned data are handled using fast Fourier algorithm, A, B, C three-phase of measurement is calculated
Circuital phase angle, obtain the circuital angle of three-phase；
S3) multilevel iudge：The circuital angle data of this three-phase and the Zinc-Oxide Arrester group before are corresponding mutually complete
The statistics of electric current angle is sequentially arranged, calculate this correspondence phase total current angle compared with previous variable quantity and
The absolute deviation of this three-phase total current angle, if the absolute deviation or the variable quantity exceed warning value, to the oxygen
Change zinc arrester group and strengthen monitoring, that is, increase pendulous frequency, if the absolute deviation or the variable quantity exceed fault value,
Judge that the Zinc-Oxide Arrester group has broken down, overhaul immediately.
Above-mentioned warning value, fault value are rule of thumb set, and setting means can be used as reference in table 1 below.
Table 1
Above-mentioned steps S3) in statistics acquisition process it is as follows：
1) to the Zinc-Oxide Arrester group newly put into, commissioning test terminate and it is qualified put into operation after, carry out a step
S1), S2) middle operation, obtain the primary data of the circuital angle of Zinc-Oxide Arrester group A, B, C three-phase and include statistical number
According to described primary data should be obtained in the case where the Zinc-Oxide Arrester group is in good working state, described absolute as calculating
The reference value of deviation, certainly, the present invention can also select other acquisitions in the case where Zinc-Oxide Arrester group is in good working state
Data as the reference value for calculating the absolute deviation, with specific reference to needing setting；
2) during operation maintenance afterwards, in each preventive trial carried out by code, to the zinc oxide
Arrester group carry out a step S1), S2) in operate, each mutually circuital angle data are obtained, by this three-phase total current
Angle data and correspond to the statistics of phase total current angle before and be sequentially arranged, calculate this compared with previous pair
The variable quantity of phase total current angle and the absolute deviation of this three-phase total current angle are answered, if the absolute deviation and variable quantity
It is all normal, then this data are included into statistics.
It is used as the recommendation embodiment of the present invention：The preventive trial is carried out before annual thunderstorm season.
Relative to prior art, the present invention has the advantages that：
1) method of the invention only needs to measure the total current of Zinc-Oxide Arrester group, then by calculating and analyzing multiple
The result of measurement, it is possible to judge the working condition of Zinc-Oxide Arrester group, the implementation of method of the invention can powered carry out nothing
Need to have a power failure, the reliability for not influenceing power plant to power；
2) measurement of method of the invention independent of system voltage, eliminates and directly takes voltage signal from voltage transformer
Complex operations, it also avoid the risk in above-mentioned power taking pressure signal process, relative to prior art, the reality of method of the invention
Apply safer also simpler；
3) current in resistance property keeps larger angle relative to total current very little, and with total current under normal circumstances, when resistive
When electric current changes, though total current size variation is not obvious, total current angle is more big changes, and the present invention is to zinc oxide
The change that the judgement of arrester group state is exactly based on monitoring total current angle is carried out, and is had with the inventive method very high
Sensitivity, and in the absence of calculating current in resistance property using single phase voltage value and the problem of capacity current brings deviation into, so
Relative to prior art, Zinc-Oxide Arrester built-in electrical insulation is made moist using the method for the present invention and carried out situations such as valve block aging
Judgement it is more accurate.
Brief description of the drawings
Fig. 1 is three-phase alternating current power transmission and transformation system Zinc-Oxide Arrester total current analysis chart；
Fig. 2 is total current variable angle figure；
Fig. 3 is the variation diagram of total current variable angle difference.
Embodiment
Data below is all vector.Such as Fig. 1, in three-phase alternating current system, each Zinc-Oxide Arrester of A, B, C three-phase,
Constitute Zinc-Oxide Arrester group.System three-phase voltage is represented with Ua, Ub, Uc, they keep 120 degree of phase angle difference, and amplitude
It is equal, represent the total current of three-phase respectively with Ia, Ib, Ic, represent the current in resistance property of three-phase respectively with Iar, Ibr, Icr, it is resistive
Electric current is much smaller than total current, represents the self-impedance of the Zinc-Oxide Arrester in three-phase respectively with Za, Zb, Zc, with Ra, Rb, Rc points
Do not represent the resistance of the Zinc-Oxide Arrester in each phase, Xa, Xb, Xc represent the capacitive reactance of each Zinc-Oxide Arrester respectively, Zab,
Zac, Zba, Zbc, Zca, Zcb represent that A with respect to the mutual impedance of A and B phases, then has with respect to B and C phases, B with respect to A and C phases, C respectively：
Ia=Ua/Za+Ub/Zba+Uc/Zca=Ua/ (Ra+Xa)+Ub/Zba+Uc/Zca； (1)
Ib=Ub/Zb+Ua/Zab+Uc/Zcb=Ub/ (Rb+Xb)+Ua/Zab+Uc/Zcb； (2)
Ic=Uc/Zc+Ua/Zac+Ub/Zbc=Uc/ (Rc+Xc)+Ua/Zac+Ub/Zbc； (3)
Iar=Ua/Ra； (4)
Ibr=Ub/Rb； (5)
Icr=Uc/Rc； (6)
In the system of operation, if Zinc-Oxide Arrester install position and result do not change, Xa, Xb, Xc,
Zab, Zac, Zba, Zbc, Zca, Zcb will not typically change, and when Zinc-Oxide Arrester is damaged, mainly Ra, Rb, Rc diminish,
Ultimately result in current in resistance property Iar, Ibr, Icr increase.
But, existing test mode is based on to system three-phase voltage and the circuital measurement of three-phase, is to hardly result in
The value of this kind of mutual impedance of Zab, Zac, Zba, Zbc, Zca, Zcb, or simply replaced with compensation way, therefore really can not
Current in resistance property Iar, Ibr, Icr accurately are calculated according to formula (1)-(6), i.e., can not be accurately judged to the shape of Zinc-Oxide Arrester
State.
The inventive method is：Direct measurement arrester Ia, Ib, Ic total current, and calculate each electric current angle, with θ ab, θ bc,
θ ca are represented.
In the system of operation, if Zinc-Oxide Arrester install position and result do not change, Xa, Xb, Xc,
Zab, Zac, Zba, Zbc, Zca, Zcb will not typically change, and when Zinc-Oxide Arrester is damaged, Ra, Rb, Rc diminish, and finally
Current in resistance property Iar, Ibr, Icr is caused to increase.
So in formula (1)-(3), for lead oxide arrester cracking, then mainly Ua/Ra, Ub/Rb, Ub/Rb this three
Mutually resistive curent change, other will not change, and other are mainly capacity current, due to current in resistance property and capacity current presence
90 degree of phase angle differences, when current in resistance property changes and capacity current is constant, can make total current Ia, Ib, Ic produce phase shift, i.e. angle and send out
Changing.
By taking A phases as an example, when Zinc-Oxide Arrester just puts into or had a power failure progress preventive trial confirmation no problem, throwing
Enter under running status, measure Ia, Ib, Ic total current and calculate each electric current angle theta ab, θ bc, θ ca, be designated as θ ab0, θ bc0, θ
ca0.If A phase oxidation zinc arrester crackings, Ra diminishes, current in resistance property Iar becomes big, ultimately results in total current Ia phase angles and becomes
Change, θ ab, θ ca change, and θ bc are constant, now measure again, are designated as θ ab1, θ bc1, θ ca1.
Calculating measures difference twice, is designated as Δ θ ab, Δ θ bc, Δ θ ca.
Δ θ ab=| θ ab1- θ ab0 |；
Δ θ bc=| θ bc1- θ bc0 |；
Δ θ ca=| θ ca1- θ ca0 |；
When Δ θ ab, Δ θ bc exceed threshold value Δ θ p, it is possible to determine that A phase oxidation zinc arresters have cracking.
Hereinafter experimental data of the invention：
Certain 110kV wired foil Zinc-Oxide Arrester of certain transformer station, model YH10W5-108/268, in 2010 11
The moon puts into operation, wherein 2 months 2011 test datas are normal, it is reference value.Handed under the arrester working voltage in March, 2012
Flow in total current live testing, find circuit AB phases, BC phase total current variable angles more than 4 °, the resistive electricity of B phase arresters
The test result flowed compared with August, 2011 increases 44% (increasing to 0.101mA by 0.070mA).
Table 2
Find that middle springs 4 sheet resistance pieces up have surface aluminium coated and come off, change colour during factory disassembles returning, confirm this
There is problem in B phase arresters.
According to the Novel lightning arrester charged test method in this patent, with 2 months 2011 arresters it is in good condition when measure
It is worth for reference value, calculates circuital angle theta ab, θ bc, θ ca measured for follow-up each time, and calculate each total current angle
Absolute deviation Δ θ ab, Δ θ bc, Δ θ ca, as shown in table 2.According to data above according to timing node mapping such as Fig. 2 and Fig. 3
It is shown.
θ ca and Δ θ ca do not change substantially with the time it can be seen from Fig. 2 and Fig. 3, but θ ab, Δ θ ab, θ bc, Δ θ
Bc there occurs the angle skew more than 4 °, according to this patent determination methods, can assert that this arrester B phases have problem, make resistance
Property electric current it is bigger than normal, cause θ ab, Δ θ ab, θ bc, Δ θ bc to there occurs big angle skew.
This example proves that this method can accurately reflect the failure of arrester, but in the measurements without introducing voltage ginseng
Consider, more convenience and practicality.
Above-described embodiment is only demonstrated by how judging that arrester group whether there is using total current angle absolute deviation Δ θ
Failure, in fact, arrester group correspondence phase total current angle mutation, i.e., the variable quantity of the close angle of total current twice is excessive,
It is a kind of signal of surge arrester failure.
Claims (2)
1. one kind is based on circuital Zinc-Oxide Arrester group charged test method, it is characterised in that comprise the following steps：
S1) DATA REASONING：Pass through the ground connection of each Zinc-Oxide Arrester in synchronous measuring apparatus synchro measure Zinc-Oxide Arrester group
Electric current on lead, obtains the total current of A, B, C three-phase, and switchs to data signal storage；
S2) data processing：Above-mentioned data are handled using fast Fourier algorithm, calculate measurement A, B, C three-phase it is complete
The phase angle of electric current, obtains the circuital angle of three-phase；
S3) multilevel iudge：By the circuital angle data of this three-phase phase total current corresponding with the Zinc-Oxide Arrester group before
The statistics of angle is sequentially arranged, calculate this correspondence phase total current angle compared with previous variable quantity and this
The absolute deviation of three-phase total current angle, if the absolute deviation or the variable quantity exceed warning value, to the zinc oxide
Arrester group strengthens monitoring, that is, increases pendulous frequency, if the absolute deviation or the variable quantity exceed fault value, judges
The Zinc-Oxide Arrester group has broken down, and overhauls immediately；
Described step S3) in statistics acquisition process it is as follows：
1) to the Zinc-Oxide Arrester group newly put into, commissioning test terminate and it is qualified put into operation after, carry out a step S1),
S2 operated in), obtain the primary data of the circuital angle of Zinc-Oxide Arrester group A, B, C three-phase and include statistics,
Described primary data should be obtained in the case where the Zinc-Oxide Arrester group is in good working state, be used as the calculating absolute deviation
Reference value；
2) it is lightning-arrest to the zinc oxide in each preventive trial carried out by code during operation maintenance afterwards
Device group carry out a step S1), S2) in operate, each mutually circuital angle data are obtained, by the circuital folder of this three-phase
Angular data and the statistics of phase total current angle is corresponded to before be sequentially arranged, calculate this corresponding phase with previous compared with
The absolute deviation of the variable quantity of total current angle and this three-phase total current angle, if the absolute deviation and variable quantity are all just
Often, then this data are included into statistics.
2. according to claim 1 be based on circuital Zinc-Oxide Arrester group charged test method, it is characterised in that institute
Preventive trial is stated to carry out before annual thunderstorm season.
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| CN108333455A (en) * | 2018-04-08 | 2018-07-27 | 广东电网有限责任公司 | A kind of measuring device with electricity for three-phase alternating current metal oxide arrester group |
| CN109375001B (en) * | 2018-09-25 | 2021-03-09 | 中国南方电网有限责任公司超高压输电公司南宁局 | Zinc oxide arrester resistive current live test data diagnosis method |
| CN111579905B (en) * | 2020-05-18 | 2022-05-31 | 云南电网有限责任公司红河供电局 | Method for testing live-line of series-compensated zinc oxide arrester |
| CN113848376A (en) * | 2021-10-21 | 2021-12-28 | 国网江苏省电力有限公司连云港供电分公司 | Lightning arrester live-line monitoring device and method based on three-phase leakage current phase angle difference |
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| CN201945871U (en) * | 2010-12-30 | 2011-08-24 | 南京世都科技有限公司 | Online monitoring device for resistive current of long-distance power transmission line arrester |
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| JPS60147657A (en) * | 1984-01-12 | 1985-08-03 | Toshiba Corp | Method for measuring leak current of arrester |
| CN102012449B (en) * | 2010-11-01 | 2013-01-09 | 铜川供电局 | Wireless on-line monitoring system for zinc oxide lightning arrester of electric transmission line |
| CN102721850A (en) * | 2012-06-08 | 2012-10-10 | 上海市电力公司 | Measuring method for fundamental wave component of resistive current of zinc oxide arrester |
| CN103558455B (en) * | 2013-10-22 | 2015-09-30 | 国家电网公司 | Arrester checks method |
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| CN201945871U (en) * | 2010-12-30 | 2011-08-24 | 南京世都科技有限公司 | Online monitoring device for resistive current of long-distance power transmission line arrester |
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| 基于三相电流法的金属氧化物避雷器带电测量研究;赵伟等;《电力自动化设备》;20050430;第25卷(第4期);文章摘要、第6页左栏第1段、第9页左栏第1段-2段，图9-10 * |
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