CN107796979A - The overhead distribution zero-sequence current waveform acquisition equipment of anti-nearby lines interference - Google Patents
The overhead distribution zero-sequence current waveform acquisition equipment of anti-nearby lines interference Download PDFInfo
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- CN107796979A CN107796979A CN201710925052.3A CN201710925052A CN107796979A CN 107796979 A CN107796979 A CN 107796979A CN 201710925052 A CN201710925052 A CN 201710925052A CN 107796979 A CN107796979 A CN 107796979A
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- signal
- current waveform
- overhead distribution
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
Abstract
The invention discloses a kind of overhead distribution zero-sequence current waveform acquisition equipment of anti-nearby lines interference, solve existing for existing overhead distribution zero-sequence current waveform acquisition equipment easily by nearby lines electromagnetic interference problem.In overhead distribution line line pole tower（1）Cross-arm（2）On be provided with signal processor support（7）, in signal processor support（7）On be provided with signal processor（5）, signal processor（5）Pass through coaxial cable（6）With aerial condutor（3）On signal picker（4）Link together；Signal processor（5）By three signal pickers（4）The voltage signal of the sign overhead distribution three-phase current waveform collected is input in respective signal conditioning circuit, and add circuit is input to after signal condition and makees add operation, be i.e. output characterizes the signal of zero-sequence current waveform, i.e.,：i0=iA+iB+iC.More accurate zero-sequence current waveform is collected, realizes the accurate judgement to transmission pressure single-phase earthing.
Description
Technical field
The present invention relates to a kind of current waveform harvester, more particularly to a kind of frame of maskable nearby lines electromagnetic interference
Overhand lines zero-sequence current waveform acquisition equipment.
Background technology
Single-phase earthing easily occurs for overhead distribution, when generally permission circuit continues to run with one section after generation single-phase earthing
Between, but single-phase earthing can cause non-faulting phase voltage to raise, and phase fault easily occurs.Therefore, to overhead distribution
Single phase earth fault detection, it is significant for prevention phase fault.The detection of zero-sequence current is single phase earth fault detection
A kind of effective ways, the existing main method to the collection of overhead distribution zero-sequence current are distinguished on A, B, C phase line
Induction coil is installed, by electromagnetic induction principle, zero-sequence current is drawn after the Signal averaging that three-phase line electric current phasor will be characterized.
But the above-mentioned zero sequence current detection device based on induction coil is easily disturbed by power circuit electromagnetic field is closed on, often occur
The inaccurate phenomenon of zero sequence current measurement, and then be earth fault by the overhead distribution erroneous judgement not being grounded.
The content of the invention
The invention provides a kind of overhead distribution zero-sequence current waveform acquisition equipment of anti-nearby lines interference, solve
Easily by the technology of nearby lines electromagnetic interference existing for existing overhead distribution zero-sequence current waveform acquisition equipment
Problem.
The present invention is that solve above technical problem by the following technical programs：
The present general inventive concept is to be directly connected to using the metallic conductor of fixed resistance in distribution overhead line, passes through measurement
Line current flows through the method measurement circuitry electric current that pressure drop caused by the conductor of fixed resistance calculates tested electric current, can effectively keep away
Exempt from interference of the external electromagnetic field caused by nearby lines to measurement signal.
A kind of overhead distribution zero-sequence current waveform acquisition equipment of anti-nearby lines interference, including overhead distribution line
Line pole tower 1, signal processor support 7 is provided with the cross-arm 2 of overhead distribution line line pole tower 1, on signal processor support 7
Signal processor 5 is provided with, signal processor 5 is connected to one by the signal picker 4 on coaxial cable 6 and aerial condutor 3
Rise；The voltage signal for the sign overhead distribution three-phase current waveform that signal processor 5 collects three signal pickers 4
It is input in respective signal conditioning circuit, add circuit is input to after signal condition and makees add operation, be i.e. output characterizes zero
The signal of sequence current waveform, i.e.,：i0=iA+ iB+ iC.
Signal picker 4 is double-deck barrel-like structure, and barrel-shaped outer shell is that the shell 13 that confluxes is drawn outside electric current, barrel-shaped hypostracum
Umbrella curve form is shaped as, barrel-shaped hypostracum is that the shell 8B that confluxes is drawn in electric current, is set on the umbrella top of barrel-shaped hypostracum inner chamber
Coaxial cable 8A is equipped with, the coaxial cable 8A other end is connected with electric current and introduces the cable 12 that confluxes, and electric current introduces the cable 12 that confluxes
The other end linked together with aerial condutor incoming end 17, be connected with aerial condutor on the outer lower end face of barrel-shaped outer shell
End 18 is picked out, measurement voltage signal high potential exit 9 is provided with coaxial cable 8A, is set on barrel-shaped hypostracum inner chamber
There is measurement voltage signal low potential exit 10, measurement voltage signal high potential exit 9 and measurement voltage signal low potential draw
Go out end 10 to be electrically connected with signal processor 5 by another coaxial cable 11.
Introduce to conflux in electric current and blower tray 14 is provided between cable 12 and barrel-shaped hypostracum, set on blower tray 14
It is equipped with fan 15.
The present invention avoids nearby lines electromagnetic field to measurement in the signals transmission of current acquisition and sign electric current
As a result interference, more accurate zero-sequence current waveform is collected, realizes the accurate judgement to transmission pressure single-phase earthing.
Brief description of the drawings
Fig. 1 is the general structure schematic diagram of the present invention；
Fig. 2 is the structural representation of the signal picker 4 of the present invention；
Fig. 3 is A-A in Fig. 2 to sectional view；
Fig. 4 is the electrical block diagram of the signal processor 5 of the present invention.
Embodiment
The present invention is described in detail below in conjunction with the accompanying drawings：
A kind of overhead distribution zero-sequence current waveform acquisition equipment of anti-nearby lines interference, including overhead distribution line line pole tower
1, signal processor support 7 is provided with the cross-arm 2 of overhead distribution line line pole tower 1, is provided with signal processor support 7
Signal processor 5, signal processor 5 are linked together by coaxial cable 6 and the signal picker 4 on aerial condutor 3；Signal
The voltage signal for the sign overhead distribution three-phase current waveform that three signal pickers 4 collect is input to by processor 5
In respective signal conditioning circuit, add circuit is input to after signal condition and makees add operation, be i.e. output characterizes zero-sequence current
The signal of waveform, i.e.,：i0=iA+ iB+ iC.
Signal picker 4 is double-deck barrel-like structure, and barrel-shaped outer shell is that the shell 13 that confluxes is drawn outside electric current, barrel-shaped hypostracum
Umbrella curve form is shaped as, barrel-shaped hypostracum is that the shell 8B that confluxes is drawn in electric current, is set on the umbrella top of barrel-shaped hypostracum inner chamber
Coaxial cable 8A is equipped with, the coaxial cable 8A other end is connected with electric current and introduces the cable 12 that confluxes, and electric current introduces the cable 12 that confluxes
The other end linked together with aerial condutor incoming end 17, be connected with aerial condutor on the outer lower end face of barrel-shaped outer shell
End 18 is picked out, measurement voltage signal high potential exit 9 is provided with coaxial cable 8A, is set on barrel-shaped hypostracum inner chamber
There is measurement voltage signal low potential exit 10, measurement voltage signal high potential exit 9 and measurement voltage signal low potential draw
Go out end 10 by being electrically connected for transmission measurement voltage signal coaxial cable 11 with signal processor 5.
Introduce to conflux in electric current and blower tray 14 is provided between cable 12 and barrel-shaped hypostracum, set on blower tray 14
It is equipped with fan 15.
The signal picker 4 of the present invention has been connected in circuit, and line current is by the conductor of fixed resistance, when connecing
During ground, the electric current of Earth Phase is the transient current with mutation effect, and conductor has inductive effect, can influence transient current in itself
The accuracy of measurement；In addition, when line current has harmonic wave, conductor inductance can also have an impact to the measurement of harmonic current.
The present invention is quadratic power coaxial-type by the conductor of modelled signal collector 4, effectively reduces conductor inductance, improves transient current
The measurement accuracy of harmonic electric current.Line current will produce fuel factor by the conductor of fixed resistance so that conductor temperature liter
Height, so as to change conductor resistance rate, influence current measurement precision.The present invention is by designing the fixed conductor of signal picker 4
Cavity structure, and fan is installed, by forcing the air cooling way of air circulation conductor is maintained more stationary temperature scope,
Avoid influence of the temperature-rise effect to line current measurement accuracy.Overhead distribution measurement electricity is directly accessed using metallic conductor
The method of stream, although avoiding interference of the nearby lines to measurement result relative to coil metering system from measuring method,
Still suffer from nearby lines electromagnetic field may on metallic conductor induced potential situation, influence measurement accuracy.The present invention is by right
The method that fixed conductor designs outer layer metal, has resisted electromagnetic field caused by nearby lines to the possible sensing in fixed resistance part
Potential, it ensure that the measurement accuracy of line current.Overhead distribution current signal is converted to voltage signal by signal picker,
When overhead distribution load is smaller, its current value is smaller, and the voltage signal of signal picker output is also smaller, so as to export
Voltage signal transmit to signal processor during, exist by the nearby lines interference of electromagnetic field and the possibility of distortion.This
Invention uses transmission cable of the coaxial cable as measurement voltage signal, effectively prevent nearby lines electromagnetic field to voltage signal
Interference in transmitting procedure.
Have the tested current signal function of sensing in signal picker 4 is the structure bag of the transducing part of signal picker
Include and the shell 8B that confluxes is drawn in coaxial cable 8A and electric current, it is quadratic surface to draw the shell 8B that confluxes in electric current, and two parts are connected as one
Body.Coaxial cable 8A is column structure, outwards extends electric current successively and introduces conflux cable 12 and aerial condutor incoming end 17,
For coaxial configuration；It is umbellate form curved-surface structure that the shell 8B that confluxes is drawn in electric current, extends outward the shell 13 that confluxes is drawn outside electric current successively
End 18 is picked out with aerial condutor.There is measurement voltage signal height at the edge for drawing the shell 8B that confluxes in coaxial cable 8A and electric current respectively
Current potential exit 9 and measurement voltage signal low potential exit 10, both at the ring relative to coaxial cable 8A axisymmetricly
Shape structure.Introduce to conflux to draw outside cable 12 and electric current in electric current and blower tray 14 and fan are installed between the shell 13 that confluxes
15, the annular installing fan taking energy coil of part 12 16 of confluxing is introduced along electric current by fan 15, is electrically connected with fan 15, during work
Powered for fan 15, measurement voltage signal high potential exit 9 and measurement voltage signal low potential exit 10 transmit with being used for
Measurement voltage signal coaxial cable 11 electrically connects, and the coaxial cable 11 for transmission measurement voltage signal is from the seam of blower tray 14
Gap is led to outside signal picker, is electrically connected with signal processor 5.
Signal processor 5 has metal shell 23, and measures voltage letter with A phase measurement voltage signals input 19, B phases
Number input 20 and C phase measurement voltage signals input 21, and characterize the signal output part 22 of zero-sequence current.Surveyed for transmitting
Amount voltage signal coaxial cable 11 is electrically connected with three measurement voltage signal inputs of signal processor 5, and A phase, B phase, C phase is surveyed
Amount voltage signal inputs electrically connect with respective signal conditioning circuit input, and respective signal conditioning circuit output end is with adding
Method circuit input end electrically connects, and add circuit output end is to characterize the signal output part 22 of zero-sequence current.
Certain of aerial condutor 3 mutually electrically connects with the aerial condutor incoming end 17 of signal picker, so as to the phase distribution line
Electric current is introduced into the cable 12 that confluxes through electric current and is passed through in signal picker transducing part, then matches somebody with somebody this through drawing the shell 13 that confluxes outside electric current
Electric line electric current draws signal picker transducing part, and by aerial condutor incoming end 18 is reintroduced back to tested electric current aerial
In wire 3.Tested electric current forms voltage drop in the transducing part of signal picker 4, is drawn by measurement voltage signal high potential
End 9 and measurement voltage signal low potential exit 10, fall voltage signal is inputted for transmission measurement voltage signal coaxial cable
In 11, the potential difference signal is transmitted to this of signal processor 5 for transmission measurement voltage signal coaxial cable 11 and mutually measured
Voltage signal inputs.While signal picker 4 works, the taking energy coil 16 of fan 15 is taken by overhead distribution electric current
Can, to be powered to fan 15, fan 15 rotates the temperature relative constancy that signal picker transducing part is kept in the form of air-cooled,
When distribution line is zero load, because taking energy coil 16 can not be powered to fan 15, fan 15 is stopped.By three signal pickers
The voltage signal of the 4 sign overhead distribution three-phase current waveforms collected is input in respective signal conditioning circuit, warp
Add circuit is input to after signal condition and makees add operation, be i.e. output characterizes the signal of zero-sequence current waveform.I.e.：i0=iA+ iB+
iC。
Claims (3)
1. a kind of overhead distribution zero-sequence current waveform acquisition equipment of anti-nearby lines interference, including overhead distribution
Shaft tower（1）, it is characterised in that in overhead distribution line line pole tower（1）Cross-arm（2）On be provided with signal processor support（7）,
Signal processor support（7）On be provided with signal processor（5）, signal processor（5）Pass through coaxial cable（6）With aerial condutor
（3）On signal picker（4）Link together；Signal processor（5）By three signal pickers（4）The sign frame collected
The voltage signal of overhand lines three-phase current waveform is input in respective signal conditioning circuit, is input to after signal condition
Add circuit makees add operation, i.e. output characterizes the signal of zero-sequence current waveform, i.e.,：i0=iA+ iB+ iC.
A kind of 2. overhead distribution zero-sequence current waveform acquisition dress of anti-nearby lines interference according to claim 1
Put, it is characterised in that signal picker（4）For double-deck barrel-like structure, barrel-shaped outer shell is that the shell that confluxes is drawn outside electric current（13）, bucket
Shape hypostracum is shaped as umbrella curve form, and barrel-shaped hypostracum is that the shell that confluxes is drawn in electric current（8B）, in barrel-shaped hypostracum
Coaxial cable is provided with the umbrella top of chamber（8A）, coaxial cable（8A）The other end be connected with electric current and introduce and conflux cable（12）,
Electric current introduces the cable that confluxes（12）The other end and aerial condutor incoming end（17）Link together, in the outside of barrel-shaped outer shell
Aerial condutor is connected with bottom face and picks out end（18）, in coaxial cable（8A）On be provided with measurement voltage signal high potential extraction
End（9）, measurement voltage signal low potential exit is provided with barrel-shaped hypostracum inner chamber（10）, measurement voltage signal high potential
Exit（9）With measurement voltage signal low potential exit（10）Pass through another coaxial cable（11）With signal processor（5）Electricity
Link together.
A kind of 3. overhead distribution zero-sequence current waveform acquisition dress of anti-nearby lines interference according to claim 2
Put, it is characterised in that introduce the cable that confluxes in electric current（12）Blower tray is provided between barrel-shaped hypostracum（14）, in fan
Support（14）On be provided with fan（15）.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710925052.3A CN107796979B (en) | 2017-10-02 | 2017-10-02 | Zero sequence current waveform acquisition device for overhead distribution line with near line interference resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710925052.3A CN107796979B (en) | 2017-10-02 | 2017-10-02 | Zero sequence current waveform acquisition device for overhead distribution line with near line interference resistance |
Publications (2)
| Publication Number | Publication Date |
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| CN107796979A true CN107796979A (en) | 2018-03-13 |
| CN107796979B CN107796979B (en) | 2019-12-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710925052.3A Active CN107796979B (en) | 2017-10-02 | 2017-10-02 | Zero sequence current waveform acquisition device for overhead distribution line with near line interference resistance |
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| JPH1164391A (en) * | 1997-08-19 | 1999-03-05 | Tempearl Ind Co Ltd | Noncontact ac microcurrent detection circuit |
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Patent Citations (10)
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| SU1721524A1 (en) * | 1988-11-28 | 1992-03-23 | Душанбинское Проектно-Конструкторское Технологическое Бюро "Спецавтоматика" | Zero sequence current-to-voltage converter |
| JPH1164391A (en) * | 1997-08-19 | 1999-03-05 | Tempearl Ind Co Ltd | Noncontact ac microcurrent detection circuit |
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| CN103675569A (en) * | 2012-09-06 | 2014-03-26 | 国家电网公司 | Earth fault detection device and system for overhead line |
| CN103901252A (en) * | 2014-04-08 | 2014-07-02 | 烟台市华能电器有限公司 | 10 KV electric transmission line zero-sequence current detection system |
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| CN107796979B (en) | 2019-12-13 |
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