CN206757023U - A kind of leakage current of an arrester compensation system under electric field environment - Google Patents
A kind of leakage current of an arrester compensation system under electric field environment Download PDFInfo
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- CN206757023U CN206757023U CN201720606822.3U CN201720606822U CN206757023U CN 206757023 U CN206757023 U CN 206757023U CN 201720606822 U CN201720606822 U CN 201720606822U CN 206757023 U CN206757023 U CN 206757023U
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- current
- operational amplifier
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- arrester
- current sensor
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- 230000005684 electric field Effects 0.000 title claims abstract description 22
- 238000005259 measurement Methods 0.000 claims abstract description 11
- 238000004080 punching Methods 0.000 claims abstract description 4
- 230000001629 suppression Effects 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 4
- 230000003321 amplification Effects 0.000 claims description 2
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 2
- 230000004907 flux Effects 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000005611 electricity Effects 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 208000032750 Device leakage Diseases 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000010606 normalization Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Abstract
The utility model discloses the leakage current of an arrester compensation system under a kind of electric field environment, including：Current sensor, operational amplifier, current output unit and direct current suppress unit, the current sensor, for measuring arrester power frequency and harmonic wave leakage current, wherein the current sensor is wideband open type punching current transformer；The operational amplifier, amplified in real time for the output current to current sensor；Current output unit, for the output voltage of operational amplifier to be converted into electric current by the 4th resistance, export to current sensor；The direct current suppresses unit, in parallel with operational amplifier, for suppressing the direct current output component of operational amplifier.The beneficial effects of the utility model are：By measuring arrester output current and injecting compensation electric current equal in magnitude with it, opposite in phase in real time so that the operating magnetic field flux of test product current measurement circuit levels off to zero, so as to eliminate interference of the arrester background leakage current to verifying work.
Description
Technical field
T ＆ D Technology field is the utility model is related to, and more particularly, to keeping away under a kind of electric field environment
Thunder device leakage current compensation system.
Background technology
The development of arrester repair based on condition of component work is increasingly deep, and increasing Condition Monitoring Technology is applied to arrester
In daily state analysis detection.Operational outfit is carried out by arrester on-Line Monitor Device and monitored, grasps setting accurately and in time
Standby running status, ensureing the safe and reliable and economical operation of equipment has progressively turned into the monitoring technology of power system normalization.
The accuracy and reliability of arrester on-Line Monitor Device measurement data directly affect the effect to power equipment state monitoring,
Thus it is effectively verified under electric field environment most important.
Arrester background leakage current contains power frequency and harmonic component, and current signal amplitude, frequency and unstable.It is existing
The method of calibration that patent is related to fails to carry out real-Time Compensation to arrester background leakage current under electric field environment, it is difficult to
The stable influence for eliminating arrester background leakage current to verifying work.
Therefore, it is necessary to which a kind of leakage current of an arrester compensation system, arrester background leakage is eliminated to solve to be difficult to stabilization
The problem of electric current influences on verifying work.
The content of the invention
The utility model provides the leakage current of an arrester compensation system under a kind of electric field environment, to solve to be difficult to
It is stable to eliminate the problem of arrester background leakage current influences on verifying work.
In order to solve the above problems, the leakage current of an arrester that the utility model is provided under a kind of electric field environment is mended
System is repaid, the system includes：Current sensor, operational amplifier, current output unit and direct current suppress unit,
The current sensor, access in the arrester ground current measurement circuit under electric field environment, for measuring
Arrester power frequency and harmonic wave leakage current, wherein the current sensor is wideband open type punching current transformer；
The operational amplifier, it is connected with the output end of current sensor, for the output current to current sensor
Amplified in real time, and access current output unit, the open-loop gain of wherein operational amplifier levels off to infinity；
Current output unit, it is connected with the input of current sensor, the current output unit includes：4th electricity
Resistance, for the output voltage of operational amplifier to be converted into electric current by the 4th resistance, is exported to current sensor；
The direct current suppresses unit, including：Operational amplifier, first resistor, second resistance, 3rd resistor, the second electric capacity
With the 3rd electric capacity, the direct current suppression unit is in parallel with operational amplifier, for suppressing operational amplifier U direct current output point
Amount.
Preferably, wherein institute's system also includes：High frequency filter unit,
The High frequency filter unit, including：5th resistance and the first electric capacity, the 5th resistance are defeated with current sensor respectively
Go out end with the reverse input end of operational amplifier to be connected, the reverse input end with operational amplifier and the output respectively of the first electric capacity
End is connected, and the High frequency filter unit is used for the high frequency output component for filtering out operational amplifier.
The beneficial effects of the utility model are：
The technical solution of the utility model provides the leakage current of an arrester compensation system under a kind of electric field environment,
When can efficiently solve arrester on-Line Monitor Device and being verified under electric field environment, done by arrester background leakage current
Disturb, cause to be difficult to the technical barrier effectively verified.By measuring arrester output current and in real time injection and its equal in magnitude, phase
The opposite compensation electric current in position so that the operating magnetic field flux of current measurement circuit levels off to zero, so as to eliminate arrester background leakage electricity
Flow the interference to verifying work.
Brief description of the drawings
By reference to the following drawings, illustrative embodiments of the present utility model can be more fully understood by：
Fig. 1 is the leakage current of an arrester compensation system under the electric field environment according to the utility model embodiment
100 structural representation；And
Fig. 2 is the leakage current of an arrester compensation system under the electric field environment according to the utility model embodiment
Schematic diagram.
Embodiment
Illustrative embodiments of the present utility model are introduced with reference now to accompanying drawing, however, the utility model can use many
Different forms is implemented, and is not limited to embodiment described herein, there is provided these embodiments are in order at large and complete
Open the utility model entirely, and fully pass on the scope of the utility model to person of ordinary skill in the field.For
Term in the illustrative embodiments being illustrated in the accompanying drawings is not to restriction of the present utility model.In the accompanying drawings, identical
Cells/elements use identical reference.
Unless otherwise indicated, term (including scientific and technical terminology) used herein has to person of ordinary skill in the field
It is common to understand implication.Further it will be understood that the term limited with usually used dictionary, be appreciated that and its
The linguistic context of association area has consistent implication, and is not construed as Utopian or overly formal meaning.
Fig. 1 is the leakage current of an arrester compensation system under the electric field environment according to the utility model embodiment
100 structural representation.As shown in figure 1, the leakage current of an arrester compensation system 100 under the electric field environment is by electric current
Sensor measures arrester output current, is handled by operational amplifier real-time negative feedback, and generation is equal in magnitude, opposite in phase
Electric current is compensated, is accessed in the current measurement circuit of arrester on-Line Monitor Device so that the operating magnetic field flux of current measurement circuit becomes
Zero is bordering on, when solving the verification arrester on-Line Monitor Device under electric field environment, arrester background leakage current is difficult to
The stable technical barrier eliminated；Meanwhile there is the advantages of real-time Compensation Feedback, compensation bandwidth, stable performance.The system
100 include：Current sensor 101, operational amplifier 102, current output unit 103 and direct current suppress unit 104.Preferably,
The current sensor, access in the arrester ground current measurement circuit under electric field environment, it is lightning-arrest for measuring
Device power frequency and harmonic wave leakage current.The current sensor is wideband open type punching current sensor, in that context it may be convenient to is accessed
In arrester ground current measurement circuit under electric field environment.
Preferably, the operational amplifier, it is connected with the output end of current sensor, for the defeated of current sensor
Go out electric current in real time to be amplified, and access current output unit, the open-loop gain of wherein operational amplifier levels off to infinity.
Preferably, current output unit, it is connected with the input of current sensor, the current output unit includes：
4th resistance, for the output voltage of operational amplifier to be converted into electric current by the 4th resistance, export to current sensor.
Preferably, the direct current suppresses unit, including：Operational amplifier, first resistor, second resistance, 3rd resistor,
Two electric capacity and the 3rd electric capacity, the direct current suppression unit is in parallel with operational amplifier, and the direct current for suppressing operational amplifier is defeated
Go out component.
Preferably, wherein institute's system also includes：High frequency filter unit,
The High frequency filter unit, including：5th resistance and the first electric capacity, the 5th resistance are defeated with current sensor respectively
Go out end with the reverse input end of operational amplifier to be connected, the reverse input end with operational amplifier and the output respectively of the first electric capacity
End is connected, and the High frequency filter unit is used for the high frequency output component for filtering out operational amplifier.
In embodiment of the present utility model, current sensor measurement arrester power frequency and harmonic wave leakage current are utilized；
The output current of current sensor is amplified in real time using operational amplifier, and exported to current output unit, wherein transporting
The open-loop gain for calculating amplifier levels off to infinity；The output voltage of operational amplifier is converted into electricity using current output unit
Stream, is exported to current sensor；Suppress the direct current output component of unit suppression operational amplifier using direct current.Also include：Utilize
High frequency filter unit filters out the high frequency output component of operational amplifier.
Fig. 2 is the leakage current of an arrester compensation system under the electric field environment according to the utility model embodiment
Schematic diagram.As shown in Fig. 2 the arrester ground current measurement that current sensor T1 can be accessed easily under electric field environment is returned
Lu Zhong, for measuring arrester power frequency and harmonic wave leakage current.The electric current that operational amplifier U1 is surveyed to current sensor is carried out
Amplification in real time, output are accessed in circuit output unit.Circuit output unit is made up of resistance R4 and wire L1, and resistance R4 is by computing
Amplifier U1 output voltage is converted into electric current, and wire L1 is accessed in current sensor T1 measuring loops.High frequency filter unit by
Resistance R5, electric capacity C1 are formed, for filtering out operational amplifier U1 high frequency output components.Direct current suppresses unit by operational amplifier
U2, resistance R1, R2, R3, electric capacity C2, C3 are formed, for suppressing operational amplifier U1 direct current output components.Current sensor T1,
Operational amplifier U1 and circuit output unit composition alternating current negative-feedback circuit.In embodiment of the present utility model, keep away
Thunder device background leakage current is Ia, and operational amplifier U1 output voltages are Uo, and the electric current that wire L1 flows through is Io, current sensor
T1 input current is Ib, and current sensor T1 output current is Ic.Ib is arrester background leakage current Ia and wire L1
The result for the electric current Io superpositions flowed through, i.e. Ib=Ia+Io.It is K to set current sensor T1 proportionality coefficients, then Ic=K*Ib, fortune
It is N to calculate amplifier U1 open-loop gains, then Uo=N*Ic.The electric current Io=Uo/R4 that then wire L1 flows through.It can to sum up obtain：Uo=N*
K*Ib.Because operational amplifier U1 open-loop gain N convergences are with infinitely great, therefore Ib levels off to zero, i.e. Ia+Io ≈ 0, so as to mend in real time
Repay arrester background leakage current.
Because current sensor T1 is non-linear element, direct current signal can not be by the way that high-frequency signal can then produce high additional phase
Move, thus increase High frequency filter unit and direct current suppression unit, negative-feedback circuit normal work can be ensured.
The utility model is described by reference to a small amount of embodiment.However, it is known in those skilled in the art,
Limited as subsidiary Patent right requirement, except the utility model other embodiments disclosed above equally fall
In the scope of the utility model.
Normally, all terms used in the claims are all solved according to them in the usual implication of technical field
Release, unless clearly being defined in addition wherein.All references " one/described/be somebody's turn to do [device, component etc.] " are all opened ground
At least one example being construed in described device, component etc., unless otherwise expressly specified.Any method disclosed herein
Step need not all be run with disclosed accurately order, unless explicitly stated otherwise.
Claims (2)
1. the leakage current of an arrester compensation system under a kind of electric field environment, it is characterised in that the system includes：Electric current
Sensor, operational amplifier, current output unit and direct current suppress unit,
The current sensor, access in the arrester ground current measurement circuit under electric field environment, it is lightning-arrest for measuring
Device power frequency and harmonic wave leakage current, wherein the current sensor is wideband open type punching current transformer；
The operational amplifier, it is connected with the output end of current sensor, for the output current progress to current sensor
Amplification in real time, and accesses current output unit, and the open-loop gain of wherein operational amplifier levels off to infinity；
Current output unit, it is connected with the input of current sensor, the current output unit includes：4th resistance, use
In the output voltage of operational amplifier is converted into electric current by the 4th resistance, export to current sensor；
The direct current suppresses unit, including：Operational amplifier, first resistor, second resistance, 3rd resistor, the second electric capacity and
Three electric capacity, the direct current suppression unit is in parallel with operational amplifier, for suppressing the direct current output component of operational amplifier.
2. system according to claim 1, it is characterised in that institute's system also includes：High frequency filter unit,
The High frequency filter unit, including：5th resistance and the first electric capacity, the 5th resistance output end with current sensor respectively
It is connected with the reverse input end of operational amplifier, the first electric capacity reverse input end and output end phase with operational amplifier respectively
Connection, the High frequency filter unit are used for the high frequency output component for filtering out operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720606822.3U CN206757023U (en) | 2017-05-27 | 2017-05-27 | A kind of leakage current of an arrester compensation system under electric field environment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720606822.3U CN206757023U (en) | 2017-05-27 | 2017-05-27 | A kind of leakage current of an arrester compensation system under electric field environment |
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| CN206757023U true CN206757023U (en) | 2017-12-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3527081A1 (en) * | 2018-02-15 | 2019-08-21 | Albert Handtmann Maschinenfabrik GmbH & Co. KG | Method and device for producing food |
-
2017
- 2017-05-27 CN CN201720606822.3U patent/CN206757023U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3527081A1 (en) * | 2018-02-15 | 2019-08-21 | Albert Handtmann Maschinenfabrik GmbH & Co. KG | Method and device for producing food |
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