CN105044437A - Method for measuring resistive current of metal oxide arrester - Google Patents
Method for measuring resistive current of metal oxide arrester Download PDFInfo
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- CN105044437A CN105044437A CN201510481946.9A CN201510481946A CN105044437A CN 105044437 A CN105044437 A CN 105044437A CN 201510481946 A CN201510481946 A CN 201510481946A CN 105044437 A CN105044437 A CN 105044437A
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- 229910044991 metal oxide Inorganic materials 0.000 title claims abstract description 14
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- 230000005684 electric field Effects 0.000 claims abstract description 38
- 230000006698 induction Effects 0.000 claims abstract description 38
- 238000001914 filtration Methods 0.000 claims abstract description 4
- 238000005259 measurement Methods 0.000 claims description 18
- 239000000523 sample Substances 0.000 claims description 10
- 238000013341 scale-up Methods 0.000 claims description 2
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Abstract
The invention discloses a method for measuring resistive current of a metal oxide arrester, which comprises the following steps of (1) collecting voltage signals by using an electric field induction plate; (2) collecting a leakage current signal at the bottom of the lightning arrester by using a coil sensor; (3) respectively amplifying and filtering the acquired voltage signal and the acquired current signal; (4) and calculating the 3-order harmonic value of the resistive current of the lightning arrester according to a capacitive current compensation method, and calculating the fundamental value of the resistive current of the lightning arrester according to a vector projection method. The invention adopts an electric field induction method to collect the induction quantity of the voltage applied to the two ends of the arrester, thereby reliably and safely obtaining the resistive current fundamental wave and the 3-time harmonic value of the arrester which operates on line.
Description
Technical field
The present invention relates to the lightning arrester on-line monitoring technique of electric system, more particularly, relate to a kind of method measuring Resistive Current of Metal Oxide Surge Arrester.
Background technology
Metal oxide arrester is overvoltage protective device important in electric system, may occur faults such as making moist, aging, even can cause the blast of lightning arrester, the normal operation of serious threat electric system time serious when running at the scene.Therefore, one of on-line monitoring repair based on condition of component necessary means having become electric system is carried out to operating lightning arrester.
Lightning arrester on-line monitoring selectable feature physical quantity is more, and wherein current in resistance property can reflect the running status of lightning arrester well, and the result that can change according to its current in resistance property and harmonic component thereof judges the performance of lightning arrester.When lightning arrester deterioration, resistive current first harmonics component increases sharply, and when lightning arrester is aging, current in resistance property 3 order harmonic components value increases fast.
The algorithm of the current in resistance property of lightning arrester during calculating on-line operation is also a lot, widely used is capacitive current compensation method and VECTOR SCIAGRAPHY, that is: the voltage signal being applied to lightning arrester two ends and the current signal flow through bottom lightning arrester is obtained respectively, respectively fourier decomposition is carried out to it, obtain the first-harmonic of voltage and current and the component of 3 subharmonic, the so projection of fundamental current component in relevant voltage fundametal compoment, be exactly resistive current first harmonics value, and 3 subharmonic current in resistance property values can be obtained by capacitive current compensation method.
At present, what conventional lightning arrester on-line monitoring technique adopted is voltage transformer (VT) (PT) low-pressure side power taking pressure signalling.This method need introduce voltage reference signal from PT, and measurement result is easily subject to the error effect of voltage transformer (VT) angular difference and compensating gain, and brings safety problem.
Summary of the invention
The object of the invention is to: a kind of method that reliable, safe measurement Resistive Current of Metal Oxide Surge Arrester is provided.
To achieve these goals, the invention provides a kind of method measuring Resistive Current of Metal Oxide Surge Arrester, comprise the steps: that (1) utilizes electric field induction plate to gather voltage signal; (2) leakage current signal bottom coil pickoff collection lightning arrester is utilized; (3) voltage signal collected and current signal are carried out respectively amplify, filtering process; (4) calculate 3 subharmonic value of arrester resistance current according to capacitive current compensation method, calculate the first-harmonic value of arrester resistance current according to VECTOR SCIAGRAPHY.
As a modification of the present invention, 3 subharmonic value I of described arrester resistance current
3R=I
3x-K (I
1x/ I
1Pi
3P), in formula, I
3xfor the full leakage current of 3 subharmonic by lightning arrester, K is electric field induction plate probe measurement scale-up factor, I
1Xfor the first-harmonic total current by lightning arrester, I
1Pfor the fundamental current that electric field induction plate obtains, I
3Pfor 3 subharmonic currents that electric field induction plate obtains.
As a modification of the present invention, the first-harmonic value I of described arrester resistance current
1R=√ 2I
1xcos (Δ φ-Δ φ
1), in formula, I
1Xfor the first-harmonic total current by lightning arrester, Δ φ is I
1xwith the first-harmonic vector value U of induced voltage
1Pinitial phase difference, Δ φ
1for the first-harmonic vector value U of induced voltage
1Pthe magnitude of voltage U applied with lightning arrester two ends
1Binitial phase difference.
As a modification of the present invention, described electric field induction plate probe measurement Proportional coefficient K=(C
3+ C
1)/(2C
1+ C
3), C
1, C
3the equivalent capacity of lightning arrester A, C relative electric field tablet respectively.
As a modification of the present invention, K value gets 0.70 ~ 0.95, corrects according to different transformer station's service conditions.
Compared with prior art, the present invention adopts the collection of electric field induction method to be applied to the induction amount of lightning arrester both end voltage, thus can obtain resistive current first harmonics and 3 subharmonic value thereof of on-line operation lightning arrester reliably, safely.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, structure of the present invention and Advantageous Effects thereof are described in detail.
Fig. 1 is monitor high-level schematic functional block diagram of the present invention.
Fig. 2 is lightning arrester equivalent circuit diagram of the present invention.
Fig. 3 is electric field induction voltage signal amplification circuit diagram of the present invention.
Embodiment
In order to make goal of the invention of the present invention, technical scheme and Advantageous Effects thereof more clear, below in conjunction with the drawings and specific embodiments, the present invention is further elaborated.Should be understood that, the embodiment described in this instructions is only used to explain the present invention, is not intended to limit the present invention.
The method that the present invention measures Resistive Current of Metal Oxide Surge Arrester comprises step: (1) utilizes electric field induction plate to gather voltage signal; (2) leakage current signal bottom coil pickoff collection lightning arrester is utilized; (3) voltage signal collected and current signal are carried out respectively amplify, filtering process; (4) calculate 3 subharmonic value of arrester resistance current according to capacitive current compensation method, calculate the first-harmonic value of arrester resistance current according to VECTOR SCIAGRAPHY.
Refer to Fig. 1, monitor master chip is ARM/STM32; Power acquisition sun-generated electric power or accumulator or ultracapacitor, the TPS767D318 that system low-voltage power supply is powered to ARM specially by TI company provides; The plug-in RAM/FLASH of STM32 etc., and this locality display and telecommunication can be carried out by I/O mouth.The voltage signal of electric field induction plate collection and the lightning arrester bottom leakage current signal of CT coil pickoff collection deliver to the A/D converting unit of STM32, carry out digital-to-analog conversion, arrester resistance current 3 subharmonic value is calculated according to capacitive current compensation method, calculate arrester resistance current first-harmonic value according to VECTOR SCIAGRAPHY, thus realize the measurement of arrester resistance current.Its detailed Computing Principle is described below respectively:
1, capacitive current compensation method calculates arrester resistance current 3 subharmonic value
1) calculating of electric field induction probe measurement Proportional coefficient K
If containing 3 order harmonic components in line voltage, and the first-harmonic of three-phase voltage, 3 subharmonic peak phases are identical.Electric system electrical network three-phase voltage u (t) containing 3 subharmonic can be expressed as:
u
A(t)＝U
1Acos(ωt)+U
3Acos(3ωt+φ
3)(1)
u
B(t)＝U
1Bcos(ωt-2π/3)+U
3Bcos(3ωt-2π+φ
3)(2)
u
C(t)＝U
1Ccos(ωt+2π/3)+U
3Ccos(3ωt+2π+φ
3)(3)
Generally, U
1A=U
1B=U
1C, U
3A=U
3B=U
3C.
For the B phase of three-phase lightning protector, illustrate that condenser current compensation method calculates arrester resistance current 3 subharmonic value.The test philosophy of dual-side phase arrester resistance current 3 subharmonic value is identical.
Refer to Fig. 2, C
1, C
2, C
3be the equivalent capacity of the relative electric field induction plate of A, B, C tri-respectively, and have C
1=C
2; Sample resistance R
sit is the sample resistance of electric field induction plate.R
smuch larger than 1/ ω C
1with 1/ ω C
3, then the electric current I of electric field induction plate is flow through
pfor:
I
P＝C
1du
A/dt+C
3du
B/dt+C
1du
C/dt(4)
I
1P, I
3Pelectric field induction plate (4) induction current I respectively
pfirst-harmonic and 3 subharmonic currents, then:
I
1P＝C
1du
1A/dt+C
3du
1B/dt+C
1du
1C/dt
＝-u
1ω(C
3+C
1)sin(ωt-2π/3)(5)
I
3P＝C
1du
3A/dt+C
3du
3B/dt+C
1du
3C/dt
＝-3u
3ω(2C
1+C
3)sin(3ωt+φ
3)(6)
If I
1C, I
3Cbe respectively leakage current of an arrester first-harmonic capacity current and 3 subharmonic capacity current values; I
1X, I
3Xbe respectively leakage current of an arrester first-harmonic and 3 subharmonic current values.Because, I
1Cbe far longer than I
1R, therefore: I
1X≈ I
1C=Cdu
1/ dt; I
3C=Cdu
3/ dt.Can obtain:
I
1C＝Cdu
1/dt＝-u
1ωCsin(ωt-2π/3)；(7)
I
3C＝Cdu
3/dt＝-3u
3ωCsin(3ωt+φ
3)(8)
Obviously, I
1Pwith I
1Csame-phase, I
3Pwith I
3Csame-phase,
Order: K
1=I
1X/ I
1P≈ I
1C/ I
1P, K
3=I
3C/ I
3P(9)
Then: K=K
3/ K
1=(I
3C/ I
3P)/(I
1C/ I
1P) (10)
Formula (5) ~ (8) are substituted into formula (10) can obtain:
K＝K
3/K
1＝(I
3C/I
3P)/(I
1C/I
1P)
＝[-3u
3ωCsin(3ωt+φ
3)/-3u
3ω(2C
1+C
3)sin(3ωt+φ
3)]/
[-u
1ωCsin(ωt-2π/3)/-3u
3ωCsin(3ωt+φ
3)]
＝(C
3+C
1)/(2C
1+C
3)(11)
As can be seen from formula (11), the size of K value is only relevant with the position of electric field induction plate and the arrangement of three-phase lightning protector.Generally, in transformer station, three-phase lightning protector position is fixed, and electric field induction Board position is fixed, and can think that K value is a fixed value.
Through overtesting, K value is 0.70 ~ 0.95, can correct according to different transformer station's service conditions.
2) calculating of arrester resistance current 3 subharmonic value
During metal oxide arrester actual motion, only have the leakage current of μ A level by lightning arrester, formula (12) can be obtained, total current i
xby i
rand i
ccomposition.
I
x＝I
R+I
C(12)
Wherein: I
3x=I
3R+ I
3C(13)
That is: I
3R=I
3x-I
3C(14)
Wherein: I
xby the full leakage current of lightning arrester, μ A;
I
rby the full current in resistance property of lightning arrester, μ A;
I
cby the full capacity current of lightning arrester, μ A;
I
3xby the full leakage current of 3 subharmonic of lightning arrester, μ A;
I
3Rby 3 subharmonic current in resistance property of lightning arrester, μ A;
I
3Cby 3 subharmonic capacity currents of lightning arrester, μ A.
In the measurements, I can be recorded by CT coil pickoff
x, after carrying out Fourier decomposition, can I be obtained
3x.by electric field induction plate, adopt electric field induction method to obtain induced voltage, calculate induction current I
p.I
pi can be obtained through fourier decomposition
3P, through verification experimental verification, generally, I
3Pwith I
3Cthere is lower relation of plane:
I
3C≈(0.75～0.95)I
1x/I
1P·I
3P(15)
Wherein:
I
1Pthe fundamental current that electric field induction plate obtains, μ A;
I
1Xby the first-harmonic total current of lightning arrester, μ A;
I
3P3 subharmonic currents that electric field induction plate obtains, μ A.
So: I
3R=I
3x-I
3C=I
3x-(0.75 ~ 0.95) I
1x/ I
1Pi
3P(16)
Formula (16) is exactly the calculating formula of the current in resistance property 3 order harmonic components value by lightning arrester.
2, VECTOR SCIAGRAPHY calculates arrester resistance current first-harmonic value
In the measurements, the leakage current I bottom B phase lightning arrester can be collected by CT current sensor
x, leakage current first-harmonic value I after carrying out Fourier decomposition, can be obtained
1x.by electric field induction plate, electric field induction method is adopted to obtain induced voltage U
p, carry out fourier decomposition, obtain the first-harmonic vector value U of induced voltage
1P.When three-phase voltage first-harmonic peak value is equal, the first-harmonic vector value U of induced voltage
1Pthe magnitude of voltage U applied with lightning arrester two ends
1Bbe a fixed value at initial phase difference, can carry out adjustment according to concrete engineering and compensate, initial phase difference is: Δ φ
1.And obtain I
1xwith U
1Pinitial phase difference Δ φ.
By formula:
I
1R＝√2×I
1x×cos(Δφ-Δφ
1),(17)
Arrester resistance current first-harmonic value can be obtained.
3, be an example utilizing the inventive method below:
Lightning arrester model: YH5WZ-17/45; Environment temperature: 25 DEG C; Relative humidity: 90%.
1) design of electric field induction sensor
When electric field induction probe adopts suspended pattern to be positioned over electric field to be measured, if its present position field intensity is: the uniform electric field of Esin ω t (being directly proportional to system voltage), then the induced charge effective value Q on electric field induction plate is:
Q＝GEε
0sinωt(17)
Wherein G is the relevant constant of hemisphere physical dimension, determines by calibrating.
Induced electricity flow valuve is:
I
P＝dQ/dt＝Gωε
0Ecosωt(18)
Then: resistance R obtaining voltage is:
U
P＝RI
P(19)
Refer to Fig. 3, get R=50 ~ 100k Ω, discharge circuit amplifies process and modulation nearby to voltage signal.Previous stage amplifier composition voltage follower, adopts high input impedance amplifier CA3140 to realize.Rear stage amplifier composition amplifying circuit, to the multiple that the noise signal of slowly change is amplified is:
A
ad＝-(R
2+R
3)/R
1(20)
To the enlargement factor of power frequency and each harmonic component thereof be:
A
ac＝-(R
2+R
3+R
2R
3/R
4)/R
1(21)
Rational choice R
1, R
2, R
3, R
4resistance, can A be made
dclittle as far as possible, and A
acreach satisfactory enlargement factor.Its value is:
U
o＝A
acU
p(22)
Therefore, I
p=(U
o/ A
ac)/R (23)
Whole amplifying circuit is placed in double layer screen and adopts suspension input mode, improves the ability that it suppresses common mode interference.
2) the choosing of K value
Adopt the electric field induction of above-mentioned design to pop one's head in and carry out on-the-spot test, enchashment field voltage mutual inductor (PT) low-side signal is as standard signal in addition.As shown in table 1, calculating K value.
The voltage of table 1 electric field induction probe measurement and current data and computing
Get K=0.93.
3) calculating of arrester resistance current 3 subharmonic value
Actual measurement YH5WZ-51/134 tri-, numbering is respectively: A, B, C.Apply voltage 41kV.
The calculating of table 2 arrester resistance current 3 subharmonic value
4) calculating of arrester resistance current first-harmonic value
With test product above, with identical applying voltage, actual measurement YH5WZ-51/134 tri-, numbering is respectively: A, B, C.Apply voltage 41kV.
The calculating of table 3 arrester resistance current first-harmonic value
5) arrester resistance current measurement result
Lightning arrester model: YH5WZ-51/134;
Apply voltage: 41kV.
Adopt electric field probe inductive method to gather voltage signal, the resistive current first harmonics and 3 subharmonic value that calculate lightning arrester are as shown in table 4.
The calculating of table 4 arrester resistance current first-harmonic value and 3 subharmonic value
The announcement of book and instruction according to the above description, those skilled in the art in the invention can also carry out suitable change and amendment to above-mentioned embodiment.Therefore, the present invention is not limited to embodiment disclosed and described above, also should fall in the protection domain of claim of the present invention modifications and changes more of the present invention.In addition, although employ some specific terms in this instructions, these terms just for convenience of description, do not form any restriction to the present invention.
Claims (5)
1. measure a method for Resistive Current of Metal Oxide Surge Arrester, it is characterized in that, comprise the steps:
(1) electric field induction plate is utilized to gather voltage signal;
(2) leakage current signal bottom coil pickoff collection lightning arrester is utilized;
(3) voltage signal collected and current signal are carried out respectively amplify, filtering process;
(4) calculate 3 subharmonic value of arrester resistance current according to capacitive current compensation method, calculate the first-harmonic value of arrester resistance current according to VECTOR SCIAGRAPHY.
2. the method for measurement Resistive Current of Metal Oxide Surge Arrester according to claim 1, is characterized in that, 3 subharmonic value I of described arrester resistance current
3R=I
3x-K (I
1x/ I
1Pi
3P), in formula, I
3xfor the full leakage current of 3 subharmonic by lightning arrester, K is electric field induction plate probe measurement scale-up factor, I
1Xfor the first-harmonic total current by lightning arrester, I
1Pfor the fundamental current that electric field induction plate obtains, I
3Pfor 3 subharmonic currents that electric field induction plate obtains.
3. the method for measurement Resistive Current of Metal Oxide Surge Arrester according to claim 1, is characterized in that, the first-harmonic value I of described arrester resistance current
1R=√ 2I
1xcos (Δ φ-Δ φ
1), in formula, I
1Xfor the first-harmonic total current by lightning arrester, Δ φ is I
1xwith the first-harmonic vector value U of induced voltage
1Pinitial phase difference, Δ φ
1for the first-harmonic vector value U of induced voltage
1Pthe magnitude of voltage U applied with lightning arrester two ends
1Binitial phase difference.
4. the method for measurement Resistive Current of Metal Oxide Surge Arrester according to claim 2, is characterized in that, described electric field induction plate probe measurement Proportional coefficient K=(C
3+ C
1)/(2C
1+ C
3), C
1, C
3the equivalent capacity of lightning arrester A, C relative electric field tablet respectively.
5. the method for measurement Resistive Current of Metal Oxide Surge Arrester according to claim 4, is characterized in that, K value gets 0.70 ~ 0.95, corrects according to different transformer station's service conditions.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108196116A (en) * | 2018-03-08 | 2018-06-22 | 云南电网有限责任公司电力科学研究院 | A kind of zinc oxide lightning arrester block property current on-Line Monitor Device and method based on Zigbee |
| CN108646074A (en) * | 2018-01-12 | 2018-10-12 | 国网江苏省电力有限公司连云港供电分公司 | A kind of computational methods of the MOA resistive fundamental current growth rates based on resultant vector |
| CN109061374A (en) * | 2018-09-29 | 2018-12-21 | 广东电网有限责任公司 | Utilize the Zinc-Oxide Arrester monitoring method and device of electric substation automation system |
| CN111505420A (en) * | 2020-04-29 | 2020-08-07 | 国网陕西省电力公司电力科学研究院 | Online monitoring and diagnosing method and system for state of line arrester |
| CN112649669A (en) * | 2020-12-21 | 2021-04-13 | 汪锐 | Lightning arrester live-line detection method based on primary phase angle measurement |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108646074A (en) * | 2018-01-12 | 2018-10-12 | 国网江苏省电力有限公司连云港供电分公司 | A kind of computational methods of the MOA resistive fundamental current growth rates based on resultant vector |
| CN108646074B (en) * | 2018-01-12 | 2020-08-11 | 国网江苏省电力有限公司连云港供电分公司 | Method for calculating MOA resistive fundamental current growth rate based on synthetic vector |
| CN108196116A (en) * | 2018-03-08 | 2018-06-22 | 云南电网有限责任公司电力科学研究院 | A kind of zinc oxide lightning arrester block property current on-Line Monitor Device and method based on Zigbee |
| CN109061374A (en) * | 2018-09-29 | 2018-12-21 | 广东电网有限责任公司 | Utilize the Zinc-Oxide Arrester monitoring method and device of electric substation automation system |
| CN111505420A (en) * | 2020-04-29 | 2020-08-07 | 国网陕西省电力公司电力科学研究院 | Online monitoring and diagnosing method and system for state of line arrester |
| CN112649669A (en) * | 2020-12-21 | 2021-04-13 | 汪锐 | Lightning arrester live-line detection method based on primary phase angle measurement |
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