CN109358251A - A kind of MOA arrester electrification synchronous measuring apparatus, testing instrument for electrified and charged test method - Google Patents
A kind of MOA arrester electrification synchronous measuring apparatus, testing instrument for electrified and charged test method Download PDFInfo
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Abstract
The invention discloses a kind of MOA arrester electrification synchronous measuring apparatus, the MOA lightning arrester with electrical testing meter compared based on three-phase leakage current and the MOA lightning arrester live-line test methods compared based on three-phase leakage current.Compared to existing MOA arrester live detection technology, (1) present invention is not need to rely on system voltage, the complex operations for directly taking voltage signal from voltage transformer are eliminated, other is also avoided and takes voltage signal mode bring personal safety risk；(2) it can permit when MOA arrester operates normally and detected, avoid power failure and test brought economic loss and operational risk；It (3) to the judgement of MOA arrester state is carried out by detecting the variation of leakage current angle, there is very high sensitivity in this way, and there is no calculate current in resistance property using single phase voltage value and the problem of capacity current brings deviation into, compared with prior art, the judgement carried out using this method to situations such as MOA arrester built-in electrical insulation dampness and valve block aging is more accurate.
Description
Technical field
The invention belongs to arrester the field of test technology, and in particular to a kind of MOA compared based on three-phase leakage current is kept away
Thunder device testing instrument for electrified.The invention further relates to a kind of MOA lightning arrester live-line test methods compared based on three-phase leakage current.
Background technique
MOA arrester is the protection equipment to protect electrical equipment against the damage of various overvoltage, it have response it is fast,
C-V characteristic is flat, performance is stable, discharge capacity is big, residual voltage is low, the service life is long, advantages of simple structure and simple, is power system security
The powerful guarantee of operation.As power grid scale constantly expands, has ten hundreds of MOA arresters now and come into operation, these
The operating status of MOA arrester is the key that guarantee that can power grid safe and reliable operation.MOA arrester can go out after longtime running
The defects of existing built-in electrical insulation dampness and valve block aging, leads to the increase of leakage current of an arrester, thermal runaway can be also caused when serious,
Influence electricity safety production, it is therefore desirable to periodically carry out preventive trial, determine whether its working condition is good.Therefore, pass through
Immediately, easily means or device detect these reliability of structures, particularly significant for the reliability service of power grid.In recent years
Coming, the requirement of power supply reliability makes MOA test of lightning arrester by switching to based on original power failure prerun based on live testing,
In the case where having a power failure, by the measurement of resistive component in the leakage current to MOA arrester valve piece, MOA arrester is judged
The aging and dampness situation of valve block.Currently, traditional live testing principle be based primarily upon system voltage and leakage current two because
Element, the usually voltage of measurement leakage current of an arrester and corresponding phase, the measurement leakage electricity from Zinc-Oxide Arrester ground lead
Stream obtains voltage signal from the metering terminal of system voltage mutual inductor, or obtains maintenance supply voltage as voltage signal, into
Row measurement and calculating.But since the capacitively coupled influence of adjacent phase current leads to not to measure accurate current in resistance property and complete
Electric current angle, therefore conventional method assumes that the angle, and calculates circuital capacitive component, resistive point according to the hypothesis angle
Amount, then judges Zinc-Oxide Arrester state.However, the measurement of leakage current is relatively easy, but the standard of system voltage signal
Really obtaining is always a problem, because there are interphase interference, the leakages of any one phase for A, B, C phase for three-phase alternating current system
Electric current can all have the capacity current that other two-phase Space Couplings come, the current in resistance property calculated using single phase voltage value
There can be deviation with capacity current；It is again more complicated that voltage signal directly is taken from voltage transformer simultaneously, and there are certain risks.
Summary of the invention
Technical problem to be solved by the invention is to provide it is a kind of independent of system voltage, be based on three-phase leakage current
Testing instrument for electrified comparing, for MOA arrester condition monitoring.The present invention may be implemented to three-phase alternating current power transmission and transformation system
Different voltages grade, the MOA arrester group of different capabilities carry out live testing and state analysis in uniting, to judge MOA arrester
Inside whether there is the foundation that the offer of the defects of humidified insulation and valve block aging can refer to.
The present invention solves above-mentioned technical problem by the following technical programs,
A kind of MOA arrester electrification synchronous measuring apparatus, which is characterized in that including data processing module, data acquisition module
Block, Temperature and Humidity module and data transmission module；
Wherein,
The data processing module is made of controller U1, capacitor C1, resistance R1 and crystal oscillating circuit；The data processing mould
The three-phase leakage current that the data acquisition module obtains and phase angle analog signal are converted to three-phase leakage current and phase angle by block
Digital signal；
The controller U1 is 8052 single-chip microcontroller of model；
The both ends of the crystal oscillating circuit are separately connected 14,15 pins of the controller U1；
1 pin of one end connection power supply VCC and controller U1 of the resistance R1, the other end connect the 6 of controller U1
After pin, then via capacitor C1 ground connection；
16 pins of the controller U1 are grounded, and are external grounding ports；
The data acquisition module is made of acquisition chip U3A and resistance R2, R3, R4, R5, and the data acquisition module is adopted
Collect the leakage current and phase angle analog signal of three-phase MOA arrester；
2,4,6,8 pins of the acquisition chip U3A pass through respectively resistance R2, R3, R4, R5 and controller U1 30,29,
28,27 pins connect, 1 pin floating of the acquisition chip U3A, and 16,14 pins pass through ammeter U2, U4 and tested letter respectively
Number input port CH1, CH2 connection；
The Temperature and Humidity module is visited by Temperature Humidity Sensor U3B, resistance R6, R7, R8, R9, R12, R13 and temperature and humidity
Head composition, the Temperature and Humidity module obtain warm and humid when acquiring three-phase MOA leakage current of an arrester and phase angle analog signal
Spend parameter；
11,13,15,17 pins of the Temperature Humidity Sensor U3B pass through resistance R6, R7, R8, R9 and controller U1 respectively
24,23,22,21 pins connection, 19 pin floating of the Temperature Humidity Sensor U3B, 5,3 pins respectively with resistance R12,
One end of R13 is connected, and is connected after the other end of resistance R12, R13 are in parallel with temperature and humidity probe；
The data transmission module includes USB hub, and the USB hub includes 1,2,3,4 pins and the end shell, described
Data transmission module is by three-phase leakage current and phase angle digital data transmission to host computer；
1,2,3 pins are connected with 20,19,18 pins of the controller U1 respectively, 4 pins ground connection, the shell
End is signal output port OUTPUT；Case1, case2 represent the data of transmission process output.
In order to obtain superior technique effect, there are also indicator light X1, a foot of the indicator light X1 and the 17 of controller U1
Pin is connected, and another foot ground connection plays the instruction function of trystate；
In order to obtain superior technique effect, there are also hexahedron shell, the synchronous measuring apparatus is installed inside the shell, institute
The surface for stating shell is equipped with honeycomb type heat release hole, and the temperature and humidity probe of the Temperature and Humidity module is placed in the synchro measure dress
In any honeycomb type heat release hole for setting top；
It in order to obtain superior technique effect, sets that there are five through-holes on the front panel of the shell, CH1, CH2 is installed respectively
Two measured signal input ports, grounding ports outside GND, power supply indicator and the data transmission module signal output end
Mouth OUTPUT.
In order to obtain superior technique effect, the chip model that the controller U1 is used is 8052 single-chip microcontroller.
In order to obtain superior technique effect, the acquisition chip U3A uses model HCTL-2016 chip.
In order to obtain superior technique effect, described ammeter U2, U4 are 6485 ammeter of Keithly.
In order to obtain superior technique effect, the Temperature Humidity Sensor U3B uses HTU21D Temperature Humidity Sensor.
In order to obtain superior technique effect, the USB hub is AT43301 controller.
The present invention also provides a kind of MOA lightning arrester with electrical testing meter compared based on three-phase leakage current, which is characterized in that
Including synchronous measuring apparatus and industrial personal computer,
The industrial personal computer is the host computer of the synchronous measuring apparatus；
The industrial personal computer is connected by USB line with the end shell of the USB hub of the synchronous measuring apparatus, is received and is deposited
Store up the three-phase leakage current and phase angle digital signal that the synchronous measuring apparatus is sent.
In order to obtain superior technique effect, the industrial personal computer is the 6AG4010-4AA11-0XX5 of SIEMENS company.
In order to obtain superior technique effect, the USB line is the USB2.0A/B line of 1.8m.
Another technical problem to be solved by this invention be to provide it is a kind of independent of system voltage, let out based on three-phase
Charged test method that leakage current compares, for MOA arrester condition monitoring.
The present invention solves above-mentioned technical problem by following technical solution,
A kind of MOA lightning arrester live-line test method compared based on three-phase leakage current, steps are as follows,
(1) data acquire: the industrial personal computer is passed through the USB hub connection synchronous measuring apparatus, the synchronization
Measuring device synchronous acquisition is tested the three-phase leakage current and phase angle of three-phase MOA arrester, and three-phase leakage current is obtained after conversion
With phase angle digital signal, and it is sent to industrial personal computer；
(2) data processing: the industrial personal computer uses the collected three-phase leakage current of step (1) and phase angle digital signal
Fast Fourier algorithm carries out data processing, obtains three-phase leakage current and angle relationship curve；
(3) reference standard curve: to be tested three-phase leakage current and phase angle measured when MOA arrester just puts into operation
Data processing is carried out by step (2), the three-phase leakage current and angle relationship curve of acquisition are as reference standard curve f (θ, I)；
(4) test curve: measured three-phase leakage current and phase angle press step when being tested MOA lightning arrester live-line test
(2) data processing is carried out, obtains three-phase leakage current and angle relationship curve as test curve g (θ, I)；
(5) multilevel iudge: test curve g (θ, I) and reference standard curve f (θ, I) are compared, and observe test curve
Whether g (θ, I) obtains the operating status of MOA arrester, if test curve g (θ, I) different different from reference standard curve f (θ, I)
In reference standard curve f (θ, I), then arrester abnormal state, equipment should carry out interruption maintenance.
It is f (θ, I), test curve g with reference standard curve in step (5) to obtain superior technique effect
(θ, I), judges according to the following formula,
lg[f(θ0,I0)/g(θ0,I0)]=σ,
If σ≤σ0, then equipment running status is good；
If σ >=σ0, then equipment running status is abnormal, should arrange to overhaul；
σ in formula0For definite value relevant to arrester parameter.
In order to obtain superior technique effect, in step (1), while the temperature and humidity data of collecting test environment are gone back；
In step (2), the collected three-phase leakage current of step (1) and phase angle digital signal are calculated using fast Fourier
Method carries out data processing, obtains three-phase leakage current and angle relationship curve；
In step (3), when tested MOA arrester just puts into operation, the three-phase under acquisition different temperatures, humidity leaks electricity
Stream and phase-angle data simultaneously carry out data processing by step (2), obtain different temperatures, three-phase leakage current and phase angle under humidity
Relation curve g0(θ, I)；
Data processing is carried out using fast Fourier algorithm to temperature, humidity again, obtains temperature-humidity-three-phase leakage electricity
Stream corrects reference standard curve f'(θ, I with phase angle)；
In step (4), measured three-phase leakage current and phase angle press step when being tested MOA lightning arrester live-line test
(2) data processing is carried out, obtains three-phase leakage current and angle relationship curve as test curve g (θ, I)；
Measured temperature and humidity data substitute into temperature-humidity-three-phase leakage when being tested MOA lightning arrester live-line test
Electric current and phase angle correct reference standard curve f'(θ, I) in, obtain temperature measured when tested MOA lightning arrester live-line test and
Correction reference standard curve f under humidity0' (θ, I)；
Step (5), by test curve g (θ, I) and correction reference standard curve f0' (θ, I) be compared, observation test is bent
Whether line g (θ, I) is different from correction reference standard curve f0' (θ, I), the operating status of MOA arrester is obtained, if test curve
G (θ, I) is different from correction reference standard curve f0' (θ, I), then arrester abnormal state, equipment should carry out interruption maintenance.
Compared to existing MOA arrester live detection technology, the invention has the following beneficial effects:
(1) present invention is not need to rely on system voltage, eliminates the complexity that voltage signal is directly taken from voltage transformer
Operation, also avoids other and takes voltage signal mode bring personal safety risk；
(2) test method of the invention is live testing, can permit when MOA arrester operates normally and is detected, is kept away
Exempt to have a power failure and has tested brought economic loss and operational risk；
(3) present invention is to be carried out by detecting the variation of leakage current angle to the judgement of MOA arrester state, so should
Method has very high sensitivity, and there is no calculate current in resistance property using single phase voltage value and capacity current is brought into partially
The problem of difference compared with prior art carries out situations such as MOA arrester built-in electrical insulation dampness and valve block aging using this method
It is more accurate to judge.
Detailed description of the invention
Fig. 1 is present invention electrification synchronous measuring apparatus circuit diagram；
Fig. 2 is testing instrument for electrified flow chart of the present invention；
Fig. 3 is synchronous measuring apparatus main view of the present invention；
Fig. 4 is synchronous measuring apparatus top view of the present invention；
Fig. 5 is the left view of synchronous measuring apparatus of the present invention；
Fig. 6 is the size and angle relationship curve of certain MOA arrester resulting three-phase leakage current at the standard conditions；
Fig. 7 is Case Experiments On A curve figure compared with reference curve.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
In three-phase alternating current system, A, B, C three-phase respectively install a Zinc-Oxide Arrester, form Zinc-Oxide Arrester group.
Use Ua、Ub、UcIt is represented as A, B, C phase voltage of system, and phase angle difference equilibrium amplitude is consistent, uses Ia、Ib、IcRespectively indicate three
The leakage current of phase, uses Iar、Ibr、IcrThe current in resistance property of three-phase is respectively indicated, current in resistance property is much smaller than leakage current, uses Za、Zb、
ZcThe self-impedance for respectively indicating the Zinc-Oxide Arrester in three-phase, uses Ra、Rb、RcRespectively indicate the Zinc-Oxide Arrester in each phase
Resistance, use Xa、Xb、XcRespectively indicate the capacitive reactance of each Zinc-Oxide Arrester, Zab、Zac、Zba、Zbc、Zca、ZcbIt is opposite to respectively indicate A
B phase and C phase, B then have following formula with respect to the mutual impedance of A phase and C phase, C opposite A phase and B phase:
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 operating system, if the position of Zinc-Oxide Arrester installation and result do not change, Xa、Xb、Zab、
Zac、Zba、Zbc、Zca、ZcbGenerally it will not change, in Zinc-Oxide Arrester damage, mainly Ra、Rb、RcBecome smaller, i.e., finally leads
Cause current in resistance property Iar、Ibr、IcrIncrease.By taking A phase as an example, progress preventive trial is just put into or had a power failure in Zinc-Oxide Arrester
When confirming no problem, under the state of putting into operation, I is measureda、Ib、IcLeakage current simultaneously calculates each electric current angle thetaab、θbc、θca, note
For θab0、θbc0、θca0.If A phase oxidation zinc arrester cracking, RaBecome smaller, resistance type electric current IarBecome larger, leakage current I can be madeaPhase
Angle changes, θab、θcaAlso it changes therewith, and θbcIt can remain unchanged, measure again at this time, be denoted as θab1、θbc1、θca1。
Measured value twice is calculated, Δ θ is denoted asab、Δθbc、Δθca, then:
Δθab=| θab1-θab0|； (7)
Δθbc=| θbc1-θbc0|； (8)
Δθca=| θca1-θca0|； (9)
As Δ θab、ΔθbcMore than threshold value Δ θpWhen, it is possible to determine that there is deterioration in A phase oxidation zinc arrester.
Embodiment 1
As illustrated in fig. 1 and 2, a kind of MOA arrester charges synchronous measuring apparatus, including the acquisition of data processing module, data
Module, Temperature and Humidity module and data transmission module；
Wherein,
The three-phase leakage current and phase angle analog signal that the data processing module obtains the data acquisition module turn
It is changed to three-phase leakage current and phase angle digital signal；The data processing module is by controller U1, capacitor C1, resistance R1 and crystal oscillator
Circuit is constituted；
The controller U1 is 8052 single-chip microcontroller of model；
The both ends of the crystal oscillating circuit are separately connected 14,15 pins of the controller U1；
1 pin of one end connection power supply VCC and controller U1 of the resistance R1, the other end connect the 6 of controller U1
After pin, then via capacitor C1 ground connection；
16 pins of the controller U1 are grounded, and are external grounding ports；
According to live needs, it is additionally provided with indicator light X1, the indicator light X1 is connected with 17 pins of controller U1, plays
The instruction function of trystate；
The leakage current and phase angle analog signal of the data collecting module collected three-phase MOA arrester；The data are adopted
Collection module is made of acquisition chip U3A and resistance R2, R3, R4, R5；The acquisition chip U3A uses model HCTL-2016 core
Piece；
2,4,6,8 pins of the acquisition chip U3A pass through respectively resistance R2, R3, R4, R5 and controller U1 30,29,
28,27 pins connect, 1 pin floating of the acquisition chip U3A, and 16,14 pins pass through ammeter U2, U4 and tested letter respectively
Number input port CH1, CH2 connection；16, pass through electricity between 14 pins and ammeter U2, U4 and measured signal input port CH1, CH2
The low noise output line connection of the included model 4803 of flow table；Wherein 16 pins correspond to measured signal input port CH1,14 pins
Corresponding measured signal input port CH2；Described ammeter U2, U4 are Keithly6485 ammeter；
The Temperature and Humidity module obtains warm and humid when acquiring three-phase MOA leakage current of an arrester and phase angle analog signal
Spend parameter；The Temperature and Humidity module is visited by Temperature Humidity Sensor U3B, resistance R6, R7, R8, R9, R12, R13 and temperature and humidity
Head composition；
11,13,15,17 pins of the Temperature Humidity Sensor U3B pass through resistance R6, R7, R8, R9 and controller U1 respectively
24,23,22,21 pins connection, 19 pin floating of the Temperature Humidity Sensor U3B, 5,3 pins respectively with resistance R12,
One end of R13 is connected, and is connected after the other end of resistance R12, R13 are in parallel with temperature and humidity probe, to obtain temperature and humidity information；It is described
Temperature Humidity Sensor U3B uses HTU21D Temperature Humidity Sensor；
The data transmission module is by three-phase leakage current and phase angle digital data transmission to host computer；The data transmission
Module includes USB hub, and the USB hub includes 1,2,3,4 pins and the end shell；1,2,3 pins respectively with the control
20,19,18 pins of device U1 are connected, and 4 pins ground connection, the end shell is signal output port OUTPUT；The USB
Hub is AT43301 controller；
The host computer is connected by USB line with the end shell of USB hub, and in Fig. 1, case1, case2 representative are transmitted across
The data of journey output.
In Fig. 1, crystal oscillating circuit is common crystal oscillating circuit, value 3MHz, power Vcc 5V.The value of resistance capacitance
Respectively, R2:3k Ω, R3:3k Ω, R4::3k Ω, R5:3k Ω, R6:15k Ω, R7:1k Ω, R8:15k Ω, R9:15k Ω,
R12:15k Ω, R13:7k Ω, C1:50pF, C2:50pF, C3:1 μ F.
In the present invention, the synchronous measuring apparatus realizes the number to three-phase leakage current size and phase by controller U1
Data are transmitted to external host computer according to acquisition and digitlization conversion process, and by the data transmission module.
Embodiment 2
As shown in Figure of description 3-5, for the ease of carrying and field work, there are also six faces for synchronous measuring apparatus of the present invention
Body case, inside the shell, the surface of the shell is equipped with honeycomb type heat release hole, the temperature and humidity for the synchronous measuring apparatus installation
The temperature and humidity probe of detection module is placed in any honeycomb type heat release hole above the synchronous measuring apparatus.
It can be seen that, set that there are five through-holes on the front panel of the shell from Figure of description 3, install respectively two it is tested
Signal input port CH1, CH2, external grounding ports GND, power supply indicator and the data transmission module signal output end
Mouth OUTPUT, other are the same as embodiment 1.
Wherein, two measured signal input ports CH1, CH2 use respectively with banana plug p-wire (6m/20ft,
2.5mm2), in order to avoid equipment under test electromagnetic pollution, preferential selection is carried out using triaxle cable (18m/60ft, 50 Ω) are extended
Signal input；
Two measured signal input ports CH1, CH2 are connected respectively to letting out for the arrester of any two-phase cable of three-phase electricity
On leakage current downlead；
External grounding ports GND uses the earth cable of Band clamp；
The data transmission module signal output port OUTPUT selection using USB 2.0A/B line (1.8m) with it is upper
Machine connection；
It is normal operating conditions when power supply indicator brilliant green light, is failure state when feux rouges.
Embodiment 3
A kind of MOA lightning arrester with electrical testing meter compared based on three-phase leakage current, including synchronous measuring apparatus and industry control
Machine,
The industrial personal computer is the host computer of the synchronous measuring apparatus；
The industrial personal computer is connected by USB line with the end shell of the USB hub of the synchronous measuring apparatus, is received and is deposited
Store up the three-phase leakage current and phase angle digital signal that the synchronous measuring apparatus is sent；The industrial personal computer is common using the prior art
Model, such as the 6AG4010-4AA11-0XX5 of SIEMENS company；The USB line is the USB2.0A/B line of 1.8m.
After all of the port connection is intact, remotely being controlled by industrial personal computer can be tested.
After industrial personal computer receives the temperature of synchronous measuring apparatus transmission, three-phase leakage current and phase-angle data under humidity,
Industrial personal computer interface can show the humidity of experimental situation, temperature information at that time, and can draw test three-phase leakage current and
Phase relation test curve g (θ, I), and compared with reference standard curve f (θ, I), to judge the fortune of tested arrester
Row state.
The surface of the shell is equipped with honeycomb type heat release hole, and the temperature and humidity probe of the Temperature and Humidity module is placed in described
In any honeycomb type heat release hole above synchronous measuring apparatus；Electrification acquire tested three-phase MOA arrester leakage current and
When phase angle, the temperature and humidity measurement of experimental situation is carried out, and incoming industrial personal computer carries out data record, the display screen display of industrial personal computer
Registration is according to the average data repeatedly to measure, to avoid error.
Embodiment 4
A kind of MOA lightning arrester live-line test method compared based on three-phase leakage current, steps are as follows,
(1) data acquire: the industrial personal computer is passed through the USB hub connection synchronous measuring apparatus, the synchronization
Measuring device synchronous acquisition is tested the three-phase leakage current and phase angle of three-phase MOA arrester, and three-phase leakage current is obtained after conversion
With phase angle digital signal, and it is sent to industrial personal computer, is stored on industrial personal computer；
(2) data processing: the industrial personal computer uses the collected three-phase leakage current of step (1) and phase angle digital signal
Fast Fourier algorithm carries out data processing, obtains three-phase leakage current and angle relationship curve；
(3) reference standard curve: to be tested three-phase leakage current and phase angle measured when MOA arrester just puts into operation
Data processing is carried out by step (2), obtains three-phase leakage current and angle relationship curve as reference standard curve f (θ, I)；Ginseng
When examining standard curve test, should at 25 degrees Celsius, a standard atmospheric pressure and 70% relative humidities under carry out, with row
Except the influence of irrelevant variable；
(4) test curve: measured three-phase leakage current and phase angle press step when being tested MOA lightning arrester live-line test
(2) data processing is carried out, obtains three-phase leakage current and angle relationship curve as test curve g (θ, I)；
(5) multilevel iudge: test curve g (θ, I) and reference standard curve f (θ, I) are compared, and observe test curve
Whether g (θ, I) obtains the operating status of MOA arrester, if test curve g (θ, I) different different from reference standard curve f (θ, I)
In reference standard curve f (θ, I), then arrester abnormal state, equipment should carry out interruption maintenance and be occurred with accident prevention.
It is f (θ, I) with above-mentioned reference standard curve, for test curve g (θ, I), judges according to the following formula,
lg[f(θ0,I0)/g(θ0,I0)]=σ,
If σ≤σ0, then equipment running status is good；
If σ >=σ0, then equipment running status is abnormal, should arrange to overhaul；
σ in formula0For definite value relevant to arrester parameter.
Three-phase leakage current and angle relationship curve curve acquisition process are as follows:
(1) to the MOA arrester newly put into, after handover experiment terminates and qualification puts into operation, three-phase leakage current is carried out
Size and phase angle test, draw the size and angle relationship curve of three-phase leakage current, to obtain reference standard curve；
(2) during operating maintenance afterwards, three-phase leakage current is carried out to tested MOA arrester and phase angle is tested,
Resulting three-phase leakage current and angle relationship curve are compared with test gained reference standard curve for the first time, in comparison procedure
In, if tested MOA arrester curve should then arrange interruption maintenance, to avoid heavy losses different from reference standard curve.
Above-mentioned reference curve, should be different according to the model of MOA arrester, and corresponding three-phase is obtained when just putting into operation
Leakage current and angle relationship curve, using as canonical reference curve.When certain MOA arrester as shown in FIG. 6 just puts into operation,
The size and angle relationship curve of measured three-phase leakage current.
Embodiment 5
By analyze existing a large amount of live detection data it can be found that MOA arrester current in resistance property with temperature liter
It is high and in rising trend, when temperature is lower than 25 DEG C, current in resistance property and the substantially linear relationship of temperature, when temperature be higher than 30 DEG C it
Afterwards, the amplitude that current in resistance property increases and increases with temperature is increasing, i.e., temperature is to current in resistance property influence degree under high-temperature condition
It is deeper.
Under same case, current in resistance property and the ambient humidity of MOA arrester are positively correlated.Therefore, humidity item when test
Part should keep identical as damp condition when reference curve, to exclude the influence of humidity.
Although when testing three-phase leakage current and phase angle, while the temperature and humidity of environment is tested, it can be difficult to accomplishing and joining
When environment is identical when examining curve test, it is therefore desirable to draw three-phase leakage current and the angle relationship under different temperatures and humidity
Curve, and updating formula is calculated accordingly.Testing tested MOA arrester three-phase leakage current and phase angle test relation curve
When, while temperature and humidity is recorded, three-phase leakage current and phase under the temperature and humidity conditions are then calculated according to updating formula
Angle corrects reference curve, then by correction reference standard curve compared with testing relation curve.
The specific steps are,
In step (1), the same of the three-phase leakage current and phase angle for being tested three-phase MOA arrester is acquired by 4 method of embodiment
When, go back the temperature and humidity data of collecting test environment；
In step (2), the collected three-phase leakage current of industrial personal computer step (1) and phase angle digital signal are using in quick Fu
Leaf algorithm carries out data processing, obtains three-phase leakage current and angle relationship curve；
In step (3), when tested MOA arrester just puts into operation, the three-phase under acquisition different temperatures, humidity leaks electricity
Stream and phase-angle data, and data processing is carried out by step (2), obtain different temperatures, three-phase leakage current and phase under humidity
Angular dependence curve g0(θ, I)；
Data processing is carried out using fast Fourier algorithm to temperature, humidity again, obtains temperature-humidity-three-phase leakage electricity
Stream corrects reference standard curve f'(θ, I with phase angle)；
In step (4), measured three-phase leakage current and phase angle press step when being tested MOA lightning arrester live-line test
(2) data processing is carried out, three-phase leakage current is obtained and angle relationship curve g (θ, I) is used as test curve；
Measured temperature and humidity data substitute into temperature-humidity-three-phase leakage when being tested MOA lightning arrester live-line test
Electric current and phase angle correct reference standard curve f'(θ, I) in, obtain temperature measured when tested MOA lightning arrester live-line test and
Correction reference standard curve f under humidity0' (θ, I)；
Step (5), by test curve g (θ, I) and correction reference standard curve f0' (θ, I) be compared, observation test is bent
Whether line g (θ, I) is different from correction reference standard curve f0' (θ, I), the operating status of MOA arrester is obtained, if test curve
G (θ, I) is different from correction reference standard curve f0' (θ, I), then arrester abnormal state, equipment should carry out interruption maintenance.
Embodiment 6
The following are the present invention certain application in substations experimental data.
Certain voltage class of certain substation is the MOA arrester of 500kV, is put into operation in July, 2013, wherein 2013
December, test data was normal, and the three-phase leakage current and angle relationship curve for taking this time to measure are reference curve f (θ, I).?
When the customary inspection in January, 2018, live testing has been carried out to it, three-phase leakage current and phase angle as shown in Figure 7 has been obtained and closes
It is test curve g (θ, I).
As seen from Figure 7, after having run nearly 5 years, the three-phase leakage current and angle relationship of arrester are tested bent
Line g (θ, I) and reference curve f (θ, I) have more apparent difference, the difference of leakage current and phase angle in test curve g (θ, I)
1 ° is differed by more than with the difference of leakage current and phase angle in reference curve f (θ, I), but is no more than 2 °, therefore the arrester should add
Strong monitoring arranges interruption maintenance in due course.
In fact, by mass data repeatedly it was found that, 2 ° are differed with reference curve in the difference of leakage current phase angle
More than even, then the operating status of the equipment has been damaged, it should arrange interruption maintenance immediately.If can be without within 1 °
Maintenance, operating status at this time are good.
Above disclosed is only a preferred embodiment of the present invention, cannot limit the power of the present invention with this certainly
Sharp range, those skilled in the art can understand all or part of the processes for realizing the above embodiment, and weighs according to the present invention
Benefit requires made equivalent variations, still belongs to the scope covered by the invention.
Claims (10)
1. a kind of MOA arrester charges synchronous measuring apparatus, which is characterized in that including data processing module, data acquisition module,
Temperature and Humidity module and data transmission module；
Wherein,
The data processing module is made of controller U1, capacitor C1, resistance R1 and crystal oscillating circuit；The data processing module will
The three-phase leakage current and phase angle analog signal that the data acquisition module obtains are converted to three-phase leakage current and phase angle number
Signal；
The controller U1 is 8052 single-chip microcontroller of model；
The both ends of the crystal oscillating circuit are separately connected 14,15 pins of the controller U1；
1 pin of one end connection power supply VCC and controller U1 of the resistance R1, the other end connect 6 pins of controller U1
Afterwards, then via the capacitor C1 it is grounded；
16 pins of the controller U1 are grounded, and are external grounding ports；
The data acquisition module is made of acquisition chip U3A and resistance R2, R3, R4, R5, the data collecting module collected three
The leakage current and phase angle analog signal of phase MOA arrester；
2,4,6,8 pins of the acquisition chip U3A pass through respectively resistance R2, R3, R4, R5 and controller U1 30,29,28,
The connection of 27 pins, 1 pin floating of the acquisition chip U3A, 16,14 pins pass through ammeter U2, U4 and measured signal respectively
Input port CH1, CH2 connection；
The Temperature and Humidity module is by Temperature Humidity Sensor U3B, resistance R6, R7, R8, R9, R12, R13 and temperature and humidity probe group
At the Temperature and Humidity module obtains temperature and humidity ginseng when acquisition three-phase MOA leakage current of an arrester and phase angle analog signal
Number；
11,13,15,17 pins of the Temperature Humidity Sensor U3B pass through resistance R6, R7, R8, R9 and controller U1's respectively
24,23,22,21 pins connect, 19 pin floating of the Temperature Humidity Sensor U3B, 5,3 pins respectively with resistance R12,
One end of R13 is connected, and is connected after the other end of resistance R12, R13 are in parallel with temperature and humidity probe；
The data transmission module includes USB hub, and the USB hub includes 1,2,3,4 pins and the end shell, the data
Transmission module is by three-phase leakage current and phase angle digital data transmission to host computer；
1,2,3 pins are connected with 20,19,18 pins of the controller U1 respectively, and 4 pins ground connection, the end shell is
Signal output port OUTPUT.
2. synchronous measuring apparatus as described in claim 1, which is characterized in that there are also indicator light X1, a foot of the indicator light X1
It is connected with 17 pins of controller U1, another foot ground connection.
3. synchronous measuring apparatus as described in claim 1, which is characterized in that there are also hexahedron shell, the synchronous measuring apparatus
Inside the shell, the surface of the shell is equipped with honeycomb type heat release hole for installation, and the temperature and humidity probe of the Temperature and Humidity module is set
In any honeycomb type heat release hole above the synchronous measuring apparatus；It is set on the front panel of the shell there are five through-hole, point
It An Zhuan not two measured signal input ports of CH1, CH2, the outside GND grounding ports, power supply indicator and data transmission mould
The signal output port OUTPUT of block.
4. synchronous measuring apparatus as described in claim 1, which is characterized in that the chip model that the controller U1 is used is 8052
Single-chip microcontroller；The acquisition chip U3A uses model HCTL-2016 chip；Described ammeter U2, U4 are 6485 electricity of Keithly
Flow table；The Temperature Humidity Sensor U3B uses HTU21D Temperature Humidity Sensor；The USB hub is AT43301 controller.
5. a kind of MOA lightning arrester with electrical testing meter compared based on three-phase leakage current, which is characterized in that filled including synchro measure
It sets and industrial personal computer,
The industrial personal computer is the host computer of the synchronous measuring apparatus；
The industrial personal computer is connected by USB line with the end shell of the USB hub of the synchronous measuring apparatus, and institute is received and stored
State the three-phase leakage current and phase angle digital signal of synchronous measuring apparatus transmission.
6. testing instrument for electrified as claimed in claim 5, which is characterized in that the industrial personal computer is the 6AG4010- of SIEMENS company
4AA11-0XX5。
7. testing instrument for electrified as claimed in claim 5, which is characterized in that the USB line is the USB2.0A/B line of 1.8m.
8. a kind of MOA lightning arrester live-line test method compared based on three-phase leakage current, steps are as follows,
(1) data acquire: the industrial personal computer is passed through the USB hub connection synchronous measuring apparatus, the synchro measure
Device synchronous acquisition is tested the three-phase leakage current and phase angle of three-phase MOA arrester, and three-phase leakage current and phase are obtained after conversion
Angle digital signal, and it is sent to industrial personal computer；
(2) data processing: the industrial personal computer is by the collected three-phase leakage current of step (1) and phase angle digital signal using quick
Fourier algorithm carries out data processing, obtains three-phase leakage current and angle relationship curve；
(3) reference standard curve: to be tested three-phase leakage current and phase angle measured when MOA arrester just puts into operation by step
Suddenly (2) carry out data processing, and the three-phase leakage current and angle relationship curve of acquisition are as reference standard curve f (θ, I)；
(4) test curve: measured three-phase leakage current and phase angle press step (2) when being tested MOA lightning arrester live-line test
Data processing is carried out, obtains three-phase leakage current and angle relationship curve as test curve g (θ, I)；
(5) multilevel iudge: test curve g (θ, I) and reference standard curve f (θ, I) are compared, observation test curve g (θ,
I) whether different from reference standard curve f (θ, I), the operating status of MOA arrester is obtained, if test curve g (θ, I) is different from ginseng
Standard curve f (θ, I) is examined, then arrester abnormal state, equipment should carry out interruption maintenance.
9. charged test method as claimed in claim 8, which is characterized in that in step (5), with reference standard curve for f (θ,
I), test curve is g (θ, I), is judged according to the following formula,
lg[f(θ0,I0)/g(θ0,I0)]=σ,
If σ≤σ0, then equipment running status is good；
If σ >=σ0, then equipment running status is abnormal, should arrange to overhaul；
σ in formula0For definite value relevant to arrester parameter.
10. charged test method as claimed in claim 8, which is characterized in that in step (1), while going back collecting test environment
Temperature and humidity data；
In step (2), by the collected three-phase leakage current of step (1) and phase angle digital signal using fast Fourier algorithm into
Row data processing obtains three-phase leakage current and angle relationship curve；
In step (3), when tested MOA arrester just puts into operation, acquisition different temperatures, the three-phase leakage current under humidity and
Phase-angle data simultaneously carries out data processing by step (2), obtains different temperatures, three-phase leakage current and angle relationship under humidity
Curve g0(θ, I)；
Again to temperature, humidity using fast Fourier algorithm carry out data processing, obtain temperature-humidity-three-phase leakage current with
Phase angle corrects reference standard curve f'(θ, I)；
In step (4), when being tested MOA lightning arrester live-line test measured three-phase leakage current and phase angle by step (2) into
Row data processing obtains three-phase leakage current and angle relationship curve as test curve g (θ, I)；
Measured temperature and humidity data substitute into temperature-humidity-three-phase leakage current when being tested MOA lightning arrester live-line test
Reference standard curve f'(θ, I are corrected with phase angle) in, obtain temperature and humidity measured when tested MOA lightning arrester live-line test
Under correction reference standard curve f0' (θ, I)；
Step (5), by test curve g (θ, I) and correction reference standard curve f0' (θ, I) be compared, observe test curve g
Whether (θ, I) be different from correction reference standard curve f0' (θ, I), the operating status of MOA arrester is obtained, if test curve g
(θ, I) is different from correction reference standard curve f0' (θ, I), then arrester abnormal state, equipment should carry out interruption maintenance.
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