CN205958663U - On -line monitoring device of metallic oxide arrester - Google Patents
On -line monitoring device of metallic oxide arrester Download PDFInfo
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- CN205958663U CN205958663U CN201620718796.9U CN201620718796U CN205958663U CN 205958663 U CN205958663 U CN 205958663U CN 201620718796 U CN201620718796 U CN 201620718796U CN 205958663 U CN205958663 U CN 205958663U
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Abstract
The utility model discloses an on -line monitoring device of metallic oxide arrester, include: main control chip gathers leakage current signal and voltage signal's data acquisition module, and receipt data acquisition module's data calculate the backstage algorithm processing module that resistive current conveyed main control chip, interconnect in main control chip's leakage current 0 subassembly, data acquisition module includes: a AD conversion module for measuring the voltage at metal oxide lightning arrester both ends and metal oxide lightning arrester's the voltage current measuring module who reveals the electric current receives voltage current measuring module's signal and carries out the filter module that filtering was handled, and receive filter module's signal and carry out the AD conversion. the utility model provides an on -line monitoring device of metallic oxide arrester the utility model discloses fully consider the influence that the harmonic in the voltage drawed to resistive current, can be fine reduce because interference that harmonic voltage drawed resistive current improves on -line monitoring's efficiency and accuracy.
Description
Technical field
This utility model is related to electrical equipment technical field of measurement and test, particularly a kind of metal oxide arrester on-line monitoring
Device.
Background technology
Metal oxide arrester (MOA) has the excellent spies such as nonlinear characteristic is good, through-current capacity is big, protective value is superior
Property, it is the main device of relay protection of power system.MOA works online the impact of adversely thermal damaged, transient state, humorous state overvoltage for a long time
And the impact of the factor such as internal humidity, accelerate the aging deterioration of metal oxide arrester, lead to spark gap to damage, finally make
Protective effect lost by spark gap.Therefore operating spark gap being monitored is the important guarantor of power system security reliability service
Card.Many achievements in research are pointed out both at home and abroad, MOA is aging, internal wetted and insulating properties bad when, leakage current can increase,
Wherein resistive current component increases substantially, and therefore current in resistance property is the Important Parameters of monitoring spark gap running status.
Classical capacitive current compensation method can not remove the harmonic component in capacity current, and such harmonic component can be mixed into
In current in resistance property, the current in resistance property of this algorithm is led to produce error, thus affecting the extraction accuracy of current in resistance property, it is right to easily cause
The erroneous judgement of state of metal oxide lightning arrester.
Utility model content
For solving the deficiencies in the prior art, the purpose of this utility model is to provide a kind of metal oxide arrester online
Monitoring device and its monitoring method, this utility model takes into full account the impact that the harmonic wave in voltage extracts to current in resistance property, permissible
Reduce interference current in resistance property extracted due to harmonic voltage well, improve efficiency and the accuracy of on-line monitoring.
In order to realize above-mentioned target, this utility model adopts the following technical scheme that：
A kind of on-line monitoring device of metallic oxide arrester, including：Main control chip, collection leakage current signal and voltage
The data acquisition module of signal, the data of receiving data acquisition module simultaneously calculates after current in resistance property is sent to main control chip
Platform algorithm processing module, interconnects the man-machine interaction assembly in main control chip；Data acquisition module includes：For measuring metal
The voltage and current measurement module of the Leakage Current of the voltage at Oxide Arrester two ends and metal oxide arrester, receives electricity
The signal of piezoelectricity flow measurement module simultaneously carries out the filtration module of Filtering Processing, and the signal of the module that accepts filter simultaneously is AD converted
AD conversion module.
A kind of aforesaid on-line monitoring device of metallic oxide arrester, man-machine interaction assembly composition has：It is connected to master control
The GPRS module of chip, is connected to the PC of GPRS module, is connected to the display module of PC.
A kind of aforesaid on-line monitoring device of metallic oxide arrester, backstage algorithm processing module includes：Voltage signal
Read module, for voltage signal is carried out with the phase shifter of 90 ° of phase shifts, receives and detects the voltage signal that phase shifter transmission comes
Waveshape detector, for carrying out fft analysis FFT module, leakage current read module to the voltage signal reading, is connected to voltage
Signal reading module, the zero-crossing detector of leakage current read module, are connected to FFT module and zero-crossing detector and calculate crystalline substance
Dielectric capacitance C and G, C computing module of capacitance compensation coefficient G, are connected to waveshape detector and the multiplier of G, C computing module,
It is connected to multiplier and the subtractor of Leakage Current module.
Of the present utility model it is beneficial in that：This utility model provides a kind of metal oxide arrester on-line monitoring dress
Put, it is possible to achieve the on-line real time monitoring to metal oxide arrester, method of the present utility model considers harmonic wave electricity simultaneously
The impact to capacitive current compensation method for the pressure, be can be very good to reduce interference current in resistance property extracted due to harmonic voltage, improves
The accuracy extracting, thus reduce the erroneous judgement to metal oxide arrester practical situation causing due to harmonic wave interference, dress
Put structural principle simple, method simple possible, there is in actual monitoring very high practical value, cost-effective, economical and efficient.
Brief description
Fig. 1 is a kind of structural representation of embodiment of this utility model；
Fig. 2 is a kind of schematic diagram of embodiment of this utility model backstage algorithm processing module；
Fig. 3 is a kind of equivalent model figure of embodiment of this utility model；
Fig. 4 extracts current in resistance property and actual current in resistance property contrast effect figure for this utility model；
Specific embodiment
Below in conjunction with the drawings and specific embodiments, this utility model is made with specific introduction.
A kind of on-line monitoring device of metallic oxide arrester, including：Main control chip, collection leakage current signal and voltage
The data acquisition module of signal, the data of receiving data acquisition module simultaneously calculates the backstage that current in resistance property is sent to main control chip
Algorithm processing module, interconnects the man-machine interaction assembly in main control chip；Data acquisition module includes：For measuring metal oxygen
The voltage and current measurement module of the Leakage Current of the voltage at compound spark gap two ends and metal oxide arrester, receiving voltage
The signal of current measurement module simultaneously carries out filtration module, the signal of the module that accepts filter the AD being AD converted of Filtering Processing
Modular converter.
Man-machine interaction assembly composition has：It is connected to the GPRS module of main control chip, is connected to the PC of GPRS module, connect
Display module in PC.
Backstage algorithm processing module includes：Voltage signal read module, for carrying out the phase shift of 90 ° of phase shifts to voltage signal
Device, receives and detects the waveshape detector of the voltage signal that phase shifter transmission comes, divide for carrying out FFT to the voltage signal reading
Analysis FFT module, leakage current read module, it is connected to voltage signal read module, the zero passage detection of leakage current read module
Device, is connected to FFT module and zero-crossing detector and calculates brilliant dielectric capacitance C and G, C computing module of capacitance compensation coefficient G,
It is connected to waveshape detector and the multiplier of G, C computing module, be connected to multiplier and the subtractor of Leakage Current module.Backstage
The operating procedure of algorithm processing module is：First pass through voltage and the leakage electricity that voltage x current read module reads in main control chip
Stream, then fft analysis are carried out to the voltage signal reading by FFT module, then by zero-crossing detector to the voltage reading, leakage
Electric current carries out the i that zero passage detection obtainsx(t0)、w、u1、u3, G, C module i obtainingx(t0)、w、u1、u3Calculate brilliant dielectric to hold
Value C, capacitance compensation coefficient G；Phase shifter carries out 90 ° of phase shifts to voltage signal, and waveshape detector detects the voltage signal after phase shift,
Using multiplier, the voltage after phase shift is multiplied with G；Using subtractor, Leakage Current is subtracted each other with phase shifter acquired results, thus
Obtain current in resistance property.
Method of the present utility model considers the impact to capacitive current compensation method for the harmonic voltage, can be very good reduce by
Interference current in resistance property extracted in harmonic voltage, improves the accuracy of extraction, thus what reduction was caused due to harmonic wave interference
Erroneous judgement to metal oxide arrester practical situation；The monitoring method of on-line monitoring device of metallic oxide arrester include as
Lower step：
(1) the initial voltage u and initial leakage current i of metal oxide arrester are obtainedx；
(2) initial voltage signal is carried out fft analysis, obtain fundamental voltage amplitude u1, 3 subharmonic voltage amplitudes u3And
Frequency w；
(3) initial voltage and Leakage Current are passed through zero-crossing detector, finding initial voltage is the corresponding leakage of zero moment
Electric current ix(t0)；
(4) by fundamental voltage amplitude u obtained by step 2,31, 3 subharmonic voltage amplitudes u3, frequency w, leakage current ix
(t0) bring formula (1) into and obtain brilliant dielectric capacitance C,
(5) by fundamental voltage amplitude u obtained by step 2,41, 3 subharmonic voltage amplitudes u3, frequency w, brilliant dielectric capacitance C
Bring formula (2) into and obtain capacitance compensation coefficient G,
(6) initial voltage signal is passed through 90 ° of phase shifter phase shift counterclockwise, the voltage after waveforms detection obtains phase shift
usf；
(7) by capacitance compensation coefficient G, the voltage u obtained by step 5,6sfIt is multiplied by multiplier；
(8) by the leakage current i acquired in step 1xAnd the result obtained by step 7 subtracted each other by subtractor, obtain
Resistive current component iR；
(9) the resistive current component iR obtained by step 8 is uploaded to main control chip, by main control chip, data is transmitted
To display module and GPRS module；
(10) data obtained by step 9 is sent to PC by GPRS module.
It should be noted that：The pushing away of formula (1) (2) in the monitoring method of on-line monitoring device of metallic oxide arrester
The process of leading is：, in normal work, the power current flowing through within spark gap is very little, at spark gap for metal oxide arrester
In small current area.In small current area, MOA model can simplifiedly be equivalent to as described in Figure 3 by electric capacity and nonlinear resistance simultaneously
The model of connection.In Fig. 3, ixFor leakage current of an arrester, iRThe current in resistance property producing for nonlinear resistance, icProduce for electric capacity and hold
Property electric current, u be spark gap two ends voltage.Leakage current of an arrester ixFor current in resistance property iRWith capacity current icSum.
Classical capacitive current compensation method principle is to will leak out electric current ixIn capacitive current component icCompensation is fallen, thus
To current in resistance property iR, its principle can be with formula (3) expression：
When capacitive current compensation falls, ix-GusfIt is current in resistance property, can obtain
iR=ix-Gusf(4)
If containing 3 subharmonic voltages in electrical network, acting on the voltage on MOA can be expressed as：
U=u1sin(wt)+u3sin(3wt) (5)
u1And u3It is respectively the amplitude of fundamental wave and 3 subharmonic.
Capacity current is：
Current in resistance property is：
iR=IR1sinwt+IR3sin3wt (7)
IR1And IR3It is respectively fundamental current and the 3 subharmonic current amplitudes of MOA current in resistance property.
(5), (6), (7) are substituted into (3) formula, in the hope of penalty coefficient G can be：
Now, the current in resistance property value under harmonic voltage is can get by formula (4),
Formula (9) is compared with formula (7), it is known that the harmonic voltage meeting after line voltage adds harmonic wave, in electrical network
On current in resistance property produce impact it is contemplated that harmonic voltage penalty coefficient G such as formula (8) shown in it can be seen that not only with fundamental voltage
About also related with electric voltage frequency and 3 subharmonic voltage amplitudes.
When in the voltage zero-cross at spark gap two ends, flow through the current in resistance property i of spark gapRIt is zero, then flow through spark gap
Total current ixEqual with the capacitive current component of arrester valve piece made of metallic oxide.In the voltage containing 3 subharmonic, electricity entirely
Stream ixCan be expressed as：
It is located at the t0 moment, the line voltage instantaneous value being carried in the lightning-arrest two ends of metal-oxide is zero, now can be with voltage
Can be expressed from the next：
u(t0)=u1sinwt0+u3sin3wt0=0 (11)
Total current i that metal-oxide is taken shelter from the thunder in the case of voltage zero-cross further can be obtainedx(t0) value：
ix(t0)=iR(t0)+wc(u1coswt0+3u3cos3wt0) (12)
According to feature during voltage zero-cross, metal oxide arrester valve in the case of voltage zero-cross can be obtained by formula (12)
Brilliant dielectric capacitance on piece：
Due to the brilliant dielectric of MOA valve block hold can be approximate think constant, it can be considered that the electric capacity of formula (13) gained
Value is the brilliant dielectric capacitance of MOA.
Formula (13) is brought in (8) formula and can obtain containing the penalty coefficient under voltage harmonic
And try to achieve the current in resistance property value under harmonic voltage using formula (4).
Using the current in resistance property obtained by the method used by this utility model and actual current in resistance property effect contrast figure such as
Shown in Fig. 4.Fig. 4 shows, the current in resistance property that this utility model is extracted is had with the actual current in resistance property of metal oxide arrester
Concordance, illustrates that this method can realize the on-line monitoring to metal oxide arrester well well.By analyzing Fig. 4
Can obtain, the total current of metal oxide arrester and current in resistance property numerical value are relatively stable, waveform has periodically and right
Title property, meets the practical operation situation of MOA.The current in resistance property oscillogram that actual current in resistance property in Fig. 4 is extracted with context of methods
Most of region is more consistent, and the current waveform extracting herein in the current over-zero moment has less shake, is due to electrical network electricity
The therein harmonic wave of the nonlinear elements generation of a small amount of higher hamonic wave and metal oxide arrester itself is contained in pressure
Impact, this utility model is to simplify to calculate to have ignored the impact of the less Electric Network Higher Harmonic of quantity, but total resistive curve
Concordance is higher, meets the needs of actual monitoring process.
This utility model provides a kind of on-line monitoring device of metallic oxide arrester and its monitoring method, it is possible to achieve right
The on-line real time monitoring of metal oxide arrester, simultaneously method of the present utility model consider harmonic voltage to capacity current mend
Repay the impact of method, can be very good to reduce interference current in resistance property extracted due to harmonic voltage, improve the accuracy of extraction,
Thus reducing the erroneous judgement to metal oxide arrester practical situation causing due to harmonic wave interference, apparatus structure principle is simple,
Method simple possible, has very high practical value, cost-effective, economical and efficient in actual monitoring.
Of the present utility model ultimate principle, principal character and advantage have been shown and described above.The technical staff of the industry
It should be appreciated that above-described embodiment in any form limit this utility model, all by the way of equivalent or equivalent transformation
The technical scheme being obtained, all falls within protection domain of the present utility model.
Claims (3)
1. a kind of on-line monitoring device of metallic oxide arrester is it is characterised in that include：Main control chip, gathers leakage current
Signal and the data acquisition module of voltage signal, receive the data of above-mentioned data acquisition module and calculate current in resistance property and be sent to
The backstage algorithm processing module of above-mentioned main control chip, interconnects the man-machine interaction assembly in above-mentioned main control chip；Above-mentioned data
Acquisition module includes：For measuring the voltage at metal oxide arrester two ends and the Leakage Current of metal oxide arrester
Voltage and current measurement module, receive the signal of above-mentioned voltage and current measurement module and carry out the filtration module of Filtering Processing, connect
The AD conversion module received the signal of above-mentioned filtration module and be AD converted.
2. a kind of on-line monitoring device of metallic oxide arrester according to claim 1 is it is characterised in that above-mentioned man-machine
Interactive component composition has：It is connected to the GPRS module of above-mentioned main control chip, be connected to the PC of above-mentioned GPRS module, be connected to
State the display module of PC.
3. a kind of on-line monitoring device of metallic oxide arrester according to claim 1 is it is characterised in that above-mentioned backstage
Algorithm processing module includes：Voltage signal read module, for voltage signal is carried out with the phase shifter of 90 ° of phase shifts, receives and examines
Survey the waveshape detector of the voltage signal that above-mentioned phase shifter transmission comes, for fft analysis FFT mould is carried out to the voltage signal reading
Block, leakage current read module, it is connected to above-mentioned voltage signal read module, the zero-crossing detector of leakage current read module,
It is connected to above-mentioned FFT module and zero-crossing detector and calculate brilliant dielectric capacitance C and G, C computing module of capacitance compensation coefficient G,
It is connected to above-mentioned waveshape detector and the multiplier of G, C computing module, be connected to subtracting of above-mentioned multiplier and Leakage Current module
Musical instruments used in a Buddhist or Taoist mass.
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| CN201620718796.9U CN205958663U (en) | 2016-07-08 | 2016-07-08 | On -line monitoring device of metallic oxide arrester |
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| CN201620718796.9U CN205958663U (en) | 2016-07-08 | 2016-07-08 | On -line monitoring device of metallic oxide arrester |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106066437A (en) * | 2016-07-08 | 2016-11-02 | 南京信息工程大学 | A kind of on-line monitoring device of metallic oxide arrester and monitoring method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106066437A (en) * | 2016-07-08 | 2016-11-02 | 南京信息工程大学 | A kind of on-line monitoring device of metallic oxide arrester and monitoring method thereof |
| CN106066437B (en) * | 2016-07-08 | 2018-11-23 | 南京信息工程大学 | A kind of on-line monitoring device of metallic oxide arrester and its monitoring method |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170215 Termination date: 20180708 |