CN106226638A - A kind of low voltage mutual inductor measurement loop state on_line monitoring system - Google Patents
A kind of low voltage mutual inductor measurement loop state on_line monitoring system Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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Abstract
The invention discloses a kind of low voltage mutual inductor measurement loop state on_line monitoring system, including agitator, the first voltage follower, constant current resistance, impedance transformer, in-phase proportion amplifier, band filter, rectifier filter and the second voltage follower.The present invention uses said structure, it is possible to CT loop on-line monitoring, completes to monitor on-the-spot electricity consumption situation in real time, understands measurement loop work information in time, meet intelligent grid construction requirements well.
Description
Technical field
The present invention relates to power department electric energy metrical field, be specifically related to a kind of low voltage mutual inductor measurement loop state online
Monitoring system.
Background technology
Constantly promote along with what our country's intelligent grid construction was applied and go deep into, intelligent power management and technical merit
Improving constantly, technology and management that conventional safety utilization of electric power manual site checks are challenged greatly, therefore low voltage mutual inductor electricity
Flow back to road operating mode on-line monitoring technique demand and obtain the great attention of power department.At present, once there is event in electric energy metrical loop
Barrier, such as measurement loop is short-circuited, open circuit, shunting etc., then can cause improper metering, cause electric energy meter to count less, leak meter very
To being to disregard, so that the interests of country suffer a loss, therefore, it is badly in need of one short circuit, open circuit to occur at measurement loop, divide
During the situations such as stream, automatically exporting corresponding monitoring level value, identifying for rear end sampling provides the system in reliable signal source.
Summary of the invention
It is an object of the invention to provide a kind of low voltage mutual inductor measurement loop state on_line monitoring system, solve current nothing
The situation that measurement loop is broken down by method carries out monitor, causes electric energy improper metering occur, in turn results in country
The problem that interests suffer a loss.
The present invention for achieving the above object, realizes by the following technical solutions:
A kind of low voltage mutual inductor measurement loop state on_line monitoring system, including agitator, the first voltage follower, constant current
Resistance, impedance transformer, in-phase proportion amplifier, band filter, rectifier filter and the second voltage follower；
Agitator is used for producing oscillator signal and being input in the first voltage follower, and oscillator signal is through the first voltage follow
After device output, then obtaining constant current AC signal through constant current resistance, constant current AC signal is coupled to three-phase circuit through impedance transformer
CT loop in；Constant current AC signal after overcoupling is input to in-phase proportion amplifier and carries out signal amplification, after amplification
Signal is input in band filter filter various interference and unwanted oscillation, obtains sine wave, after sinusoidal wave rectified wave filter
Obtaining direct current signal, direct current signal exports after the second voltage follower again.
Further, as optimal technical scheme, described agitator includes the first amplifier U1A, the 3rd resistance R3, the tenth electricity
Resistance R10, the 11st resistance R11, the 12nd resistance R12, the 13rd resistance R13, the 4th electric capacity C4 and the 5th electric capacity C5；
One end of described resistance R3 is connected with the inverting input of the first amplifier U1A, the other end and the first amplifier U1A defeated
Go out end to be connected；
Described tenth resistance R10 and the 11st resistance R11 is in parallel, one of them parallel connected end ground connection, and another parallel connected end is even
It is connected to the inverting input of the first amplifier U1A；
Described 5th electric capacity C5 and the 13rd resistance R13 is in parallel, one of them parallel connected end ground connection, and another parallel connected end connects
In-phase input end to the first amplifier U1A；
Described one end of 4th electric capacity C4 is connected with the in-phase input end of the first amplifier U1A, the other end and the 12nd resistance
Wherein one end of R12 is connected, and the other end of the 12nd resistance R12 and the outfan of the first amplifier U1A are connected.
Further, as optimal technical scheme, described 11st resistance R11 is variable resistance.
Further, as optimal technical scheme, described first voltage follower includes the second amplifier U1B, the second amplifier
The in-phase input end of U1B and the outfan of the first amplifier U1A are connected, the inverting input of the second amplifier U1B and the second amplifier U1B
Outfan be connected, one end of constant current resistance is connected with the outfan of the second amplifier U1B, the other end be coupling in CT loop
Impedance transformer is connected.
Further, as optimal technical scheme, described in-phase proportion amplifier includes the 3rd amplifier U1C, the second resistance
R2 and the 5th resistance R5, the in-phase input end of the 3rd amplifier U1C is connected with constant current resistance, impedance transformer, the second resistance R2
Two ends be connected with inverting input, the outfan of the 3rd amplifier U1C respectively, one end of the 5th resistance R5 and the 3rd amplifier U1C
Inverting input be connected, other end ground connection.
Further, as optimal technical scheme, described band filter include four high guaily unit U1D, the first electric capacity C1 with
And the 4th resistance R4, four high guaily unit U1D inverting input and the 3rd amplifier U1C outfan be connected, four high guaily unit U1D's is same
Phase input end grounding, the two ends of the first electric capacity C1 are connected with inverting input, the outfan of four high guaily unit U1D respectively, the 4th electricity
Resistance R4 is connected in parallel on the two ends of the first electric capacity C1.
Further, as optimal technical scheme, also include the 9th resistance R9 and the second electric capacity C2, the one of the 9th resistance R9
End is connected with the outfan of the 3rd amplifier U1C, other end ground connection；One end of second electric capacity C2 and the outfan of the 3rd amplifier U1C
Being connected, the inverting input of the other end and four high guaily unit U1D is connected.
Further, as optimal technical scheme, described rectifier filter include the 5th amplifier U2A, the first resistance R1,
Seven resistance R7, the 8th resistance R8, the first diode D1, the second diode D2 and polar capacitor C3, the 5th amplifier U2A anti-phase
Input is by being connected to the outfan of four high guaily unit U1D, the 5th amplifier after being sequentially connected in series the 8th resistance R8, the 7th resistance R7
The in-phase input end ground connection of U2A, the anode of the first diode D1 and the inverting input of the 5th amplifier U2A are connected, negative electrode and the
The outfan of five amplifiers U2A is connected, and the anode of the second diode D2 and the negative electrode of the first diode D1 are connected, the first resistance R1's
One end is connected between the 7th resistance R7 and the 8th resistance R8, and the negative electrode of the other end and the second diode D2 is connected, polar capacitor
The positive terminal of C3 and the negative electrode of the second diode D2 are connected, other end ground connection.
Further, as optimal technical scheme, described second voltage follower includes the 6th amplifier U2B, the 6th amplifier
The in-phase input end of U2B and the negative electrode of the second diode D2 are connected, and the inverting input of the 6th amplifier U2B is connected with outfan.
Further, as optimal technical scheme, also include the first two-way transient diode D3 and the second two-way transient state two
Pole pipe D4, one end of described first two-way transient diode D3 is connected with the outfan of the 6th amplifier U2B, other end ground connection；Institute
The one end stating the second two-way transient diode D4 is connected with the in-phase input end of the 3rd amplifier U1C, other end ground connection.
The present invention compared with prior art, has the following advantages and beneficial effect:
(1) present invention is by agitator, the first voltage follower, the common effect of constant current resistance, produces constant exchange
Signal, and be applied on impedance transformer, once there is impedance variation, the DC voltage of the second voltage follower output in CT loop
Will change, thus i.e. can determine that user belongs to improper electricity consumption, in time this situation be processed, it is to avoid cause into one
The loss of step.
(2) present invention is by increasing the first two-way transient diode D3 and the second two-way transient diode D4, it is ensured that defeated
Enter output signal in device working range, prevent over-current signal from damaging device, thus whole monitoring system is served very well
Protective effect.
(3) present invention is by CT loop on-line monitoring, completes to monitor on-the-spot electricity consumption situation in real time, understands metering in time
Loop work information, meets intelligent grid construction requirements well.
Accompanying drawing explanation
Fig. 1 is agitator and the electrical block diagram of the first voltage follower of the present invention；
Fig. 2 is the impedance transformer of present invention position relationship schematic diagram in three-phase circuit；
Fig. 3 is the in-phase proportion amplifier electrical block diagram with band filter of the present invention；
Fig. 4 is rectifier filter and the electrical block diagram of the second voltage follower of the present invention.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited to this.
Embodiment:
As shown in figures 1-4, a kind of low voltage mutual inductor measurement loop state on_line monitoring system described in the present embodiment, bag
Include agitator, the first voltage follower, constant current resistance, impedance transformer, in-phase proportion amplifier, band filter, rectification filter
Ripple device and the second voltage follower；
Agitator is used for producing oscillator signal and being input in the first voltage follower, and oscillator signal is through the first voltage follow
After device output, then obtaining constant current AC signal through constant current resistance, constant current AC signal is coupled to three-phase circuit through impedance transformer
CT loop in；Constant current AC signal after overcoupling is input to in-phase proportion amplifier and carries out signal amplification, after amplification
Signal is input in band filter filter various interference and unwanted oscillation, obtains sine wave, after sinusoidal wave rectified wave filter
Obtaining direct current signal, direct current signal exports after the second voltage follower again.
In the present embodiment, CT loop refers to current transformer loop, and electric energy meter is located in current transformer loop,
Agitator, the first voltage follower, constant current resistance common effect under, obtain constant AC signal, i.e. constant current exchange letter
Number, and this constant current AC signal is coupled in CT loop by impedance transformer CAT1, owing to the A/B/C three-phase of circuit works
Principle is identical, therefore, accesses this monitoring system in the CT loop of every phase, as in figure 2 it is shown, monitoring system access is to A phase
In CT loop.
It is linked into as a example by A phase by the present invention below, is specifically described.
The agitator of the present embodiment include the first amplifier U1A, the 3rd resistance R3, the tenth resistance R10, the 11st resistance R11,
12nd resistance R12, the 13rd resistance R13, the 4th electric capacity C4 and the 5th electric capacity C5；One end of resistance R3 and the first amplifier
The inverting input of U1A is connected, and the outfan of the other end and the first amplifier U1A is connected；Tenth resistance R10 and the 11st resistance
R11 is in parallel, and one of them parallel connected end ground connection, another parallel connected end is connected to the inverting input of the first amplifier U1A；5th electric capacity
C5 and the 13rd resistance R13 is in parallel, and one of them parallel connected end ground connection, another parallel connected end is connected to the homophase of the first amplifier U1A
Input；One end of 4th electric capacity C4 is connected with the in-phase input end of the first amplifier U1A, the other end and the 12nd resistance R12's
Wherein one end is connected, and the other end of the 12nd resistance R12 and the outfan of the first amplifier U1A are connected.First amplifier U1A and each
Peripheral component composition agitator, obtains oscillator signal, and the frequency of oscillator signal is determined by peripheral component, and the calculating of frequency is right
Being common knowledge for those skilled in the art, those skilled in the art can select components and parts according to the needs of frequency completely
Parameter size.
Regulating for convenience, it is easy to the oscillation signal frequency needed for acquisition, the present embodiment selectable variable resistance is as
11 resistance R11.
First voltage follower of the present embodiment includes the second amplifier U1B, the in-phase input end of the second amplifier U1B and first
The outfan of amplifier U1A is connected, and the inverting input of the second amplifier U1B and the outfan of the second amplifier U1B are connected, constant current resistance
One end be connected with the outfan of the second amplifier U1B, the other end is connected with the impedance transformer being coupling in CT loop.First electricity
Pressure follower can isolate agitator and tested loop, can improve again the carrying load ability of test high-frequency signal.
The in-phase proportion amplifier of the present embodiment includes the 3rd amplifier U1C, the second resistance R2 and the 5th resistance R5, the 3rd
The in-phase input end of amplifier U1C is connected with constant current resistance, impedance transformer, the two ends of the second resistance R2 respectively with the 3rd amplifier
The inverting input of U1C, outfan are connected, and one end of the 5th resistance R5 is connected with the inverting input of the 3rd amplifier U1C, another
End ground connection.
The band filter of the present embodiment includes four high guaily unit U1D, the first electric capacity C1 and the 4th resistance R4, four high guaily unit
The inverting input of U1D and the outfan of the 3rd amplifier U1C are connected, the in-phase input end ground connection of four high guaily unit U1D, the first electric capacity
The two ends of C1 are connected with inverting input, the outfan of four high guaily unit U1D respectively, and the 4th resistance R4 is connected in parallel on the first electric capacity C1's
Two ends.Various interference and unwanted oscillation are filtered by band filter, export ideal sine wave, make for follow-up rectifier filter
With.
In order to obtain more preferable filter effect, the present embodiment also includes the 9th resistance R9 and the second electric capacity C2, the 9th resistance
One end of R9 is connected with the outfan of the 3rd amplifier U1C, other end ground connection；One end of second electric capacity C2 and the 3rd amplifier U1C
Outfan is connected, and the inverting input of the other end and four high guaily unit U1D is connected.
The rectifier filter of the present embodiment include the 5th amplifier U2A, the first resistance R1, the 7th resistance R7, the 8th resistance R8,
First diode D1, the second diode D2 and polar capacitor C3, the inverting input of the 5th amplifier U2A is by being sequentially connected in series
The outfan of four high guaily unit U1D it is connected to after eight resistance R8, the 7th resistance R7, the in-phase input end ground connection of the 5th amplifier U2A,
The anode of one diode D1 and the inverting input of the 5th amplifier U2A are connected, and the outfan of negative electrode and the 5th amplifier U2A is connected,
The anode of the second diode D2 and the negative electrode of the first diode D1 are connected, one end of the first resistance R1 be connected to the 7th resistance R7 with
Between 8th resistance R8, the negative electrode of the other end and the second diode D2 is connected, the positive terminal of polar capacitor C3 and the second diode
The negative electrode of D2 is connected, other end ground connection.Sinusoidal signal is become direct current signal by rectifier filter, and exports the second voltage
In follower.
Second voltage follower of the present embodiment includes the 6th amplifier U2B, the in-phase input end and second of the 6th amplifier U2B
The negative electrode of diode D2 is connected, and the inverting input of the 6th amplifier U2B is connected with outfan.Second voltage follower plays isolation
Output and the effect of raising load capacity.
The present embodiment also includes the first two-way transient diode D3 and the second two-way transient diode D4, the first two-way transient state
One end of diode D3 is connected with the outfan of the 6th amplifier U2B, other end ground connection；Described second two-way transient diode D4's
One end is connected with the in-phase input end of the 3rd amplifier U1C, other end ground connection.Two-way at the first two-way transient diode D3 and second
Under the effect of transient diode D4, it is ensured that input/output signal, in device working range, prevents over-current signal from damaging device, right
Whole monitoring system plays a very good protection.
In the present embodiment, each components and parts above-mentioned can use following model to realize, and those skilled in the art exist
In the case of knowing component parameter disclosed in the present embodiment and annexation, the goal of the invention of the present invention can be realized.
First amplifier U1A, the second amplifier U1B, the 3rd amplifier U1C, four high guaily unit U1D can use four integrated transporting discharging TL074N
Realize；5th amplifier U2A and the 6th amplifier U2B can use two integrated transporting discharging TL072D to realize；
First resistance R1:2K Ω；Second resistance R2:20K Ω；3rd resistance R3:2K Ω；4th resistance R4:20K Ω；The
Five resistance R5:2K Ω；Constant current resistance R6:22K Ω；7th resistance R7:1K Ω；8th resistance R8:2K Ω；9th resistance R9:1K
Ω；Tenth resistance R10:500 Ω, the 11st resistance R11:2K Ω；12nd resistance R12:3.9K Ω；13rd resistance R13:
3.9KΩ；
First electric capacity C1:220pF；Second electric capacity C2:220pF；Polar capacitor C3:10 μ F；4th electric capacity C4:470pF；The
Five electric capacity C5:470pF；
First diode D1:IN5819；Second diode D2:IN5819；First two-way transient diode D3:
SMBJ5.0CA；Second two-way transient diode D4:SMBJ6.0CA；
Impedance transformer CAT1 can as required depending on, such as 50/75 Ω, 75/120 Ω.
The monitoring principle of the present invention is: by agitator, the first voltage follower composition standard signal source, produce vibration letter
Number, its frequency of oscillation is determined by peripheral capacitance-resistance original paper, and taking R12=R13, during C4=C5, formula is: frequency of oscillation f=1/ (2 π
RC), it is considered to its frequency changes with supply voltage, under conditions of this circuit, if supply voltage is (VCC, VCC) ± 5v, repair
Positive coefficient is q=0.932, then f=1*q/2 π RC, and wherein resistance R12, R13 selects 3.9K, and electric capacity C4, C5 select 470pF, R3/
R10/R11 Gain tuning and fixed ampllitude element, finally give 80kHZ AC signal, through constant current resistance R6 by this 80kHZ exchange letter
Number being coupled in tested CT loop, the signal after being then coupled is again through in-phase proportion amplifier, band filter, rectification
Wave filter and the second voltage follower, by judging that the change situation realization of the signal of the second voltage follower output judges low
The pressure transformer situation that works online is the most normal.Such as, when tested CT loop normally works, the second voltage follower output
Signal can be stablized in certain value, and short circuit, open circuit, shunting etc. occurs in the most tested CT loop, the second voltage follower output
Signal can produce change at once therewith, thus judges that the low voltage mutual inductor situation of working online belongs to abnormal condition.
The above, be only presently preferred embodiments of the present invention, and the present invention not does any pro forma restriction, every depends on
Any simple modification of being made above example according to the technical spirit of the present invention, equivalent variations, each fall within the protection of the present invention
Within the scope of.
Claims (10)
1. a low voltage mutual inductor measurement loop state on_line monitoring system, it is characterised in that: include agitator, the first voltage with
With device, constant current resistance, impedance transformer, in-phase proportion amplifier, band filter, rectifier filter and the second voltage follow
Device；
Agitator is used for producing oscillator signal and being input in the first voltage follower, and oscillator signal is defeated through the first voltage follower
After going out, then obtaining constant current AC signal through constant current resistance, constant current AC signal is coupled to the CT of three-phase circuit through impedance transformer
In loop；Constant current AC signal after overcoupling is input to in-phase proportion amplifier and carries out signal amplification, the signal after amplification
It is input in band filter filter various interference and unwanted oscillation, obtains sine wave, obtain after sinusoidal wave rectified wave filter
Direct current signal, direct current signal exports after the second voltage follower again.
A kind of low voltage mutual inductor measurement loop state on_line monitoring system the most according to claim 1, it is characterised in that: institute
State agitator include the first amplifier U1A, the 3rd resistance R3, the tenth resistance R10, the 11st resistance R11, the 12nd resistance R12,
13 resistance R13, the 4th electric capacity C4 and the 5th electric capacity C5；
One end of described resistance R3 is connected with the inverting input of the first amplifier U1A, the other end and the outfan of the first amplifier U1A
It is connected；
Described tenth resistance R10 and the 11st resistance R11 is in parallel, and one of them parallel connected end ground connection, another parallel connected end is connected to
The inverting input of the first amplifier U1A；
Described 5th electric capacity C5 and the 13rd resistance R13 are in parallel, one of them parallel connected end ground connection, and another parallel connected end is connected to the
The in-phase input end of one amplifier U1A；
Described one end of 4th electric capacity C4 is connected with the in-phase input end of the first amplifier U1A, the other end and the 12nd resistance R12's
Wherein one end is connected, and the other end of the 12nd resistance R12 and the outfan of the first amplifier U1A are connected.
A kind of low voltage mutual inductor measurement loop state on_line monitoring system the most according to claim 2, it is characterised in that: institute
Stating the 11st resistance R11 is variable resistance.
4., according to a kind of low voltage mutual inductor measurement loop state on_line monitoring system described in Claims 2 or 3, its feature exists
In: described first voltage follower includes the second amplifier U1B, the in-phase input end of the second amplifier U1B and the first amplifier U1A defeated
Going out end to be connected, the inverting input of the second amplifier U1B and the outfan of the second amplifier U1B are connected, one end of constant current resistance and the
The outfan of two amplifiers U1B is connected, and the other end is connected with the impedance transformer being coupling in CT loop.
A kind of low voltage mutual inductor measurement loop state on_line monitoring system the most according to claim 4, it is characterised in that: institute
Stating in-phase proportion amplifier and include the 3rd amplifier U1C, the second resistance R2 and the 5th resistance R5, the homophase of the 3rd amplifier U1C is defeated
Enter end to be connected with constant current resistance, impedance transformer, the two ends of the second resistance R2 respectively with the inverting input of the 3rd amplifier U1C,
Outfan is connected, and one end of the 5th resistance R5 is connected with the inverting input of the 3rd amplifier U1C, other end ground connection.
A kind of low voltage mutual inductor measurement loop state on_line monitoring system the most according to claim 5, it is characterised in that: institute
State band filter and include four high guaily unit U1D, the first electric capacity C1 and the 4th resistance R4, the inverting input of four high guaily unit U1D
Be connected with the outfan of the 3rd amplifier U1C, the in-phase input end ground connection of four high guaily unit U1D, the two ends of the first electric capacity C1 respectively with
The inverting input of four high guaily unit U1D, outfan are connected, and the 4th resistance R4 is connected in parallel on the two ends of the first electric capacity C1.
A kind of low voltage mutual inductor measurement loop state on_line monitoring system the most according to claim 6, it is characterised in that: also
Including the 9th resistance R9 and the second electric capacity C2, one end of the 9th resistance R9 is connected with the outfan of the 3rd amplifier U1C, another termination
Ground；One end of second electric capacity C2 is connected with the outfan of the 3rd amplifier U1C, the other end and the inverting input of four high guaily unit U1D
It is connected.
A kind of low voltage mutual inductor measurement loop state on_line monitoring system the most according to claim 7, it is characterised in that: institute
State rectifier filter include the 5th amplifier U2A, the first resistance R1, the 7th resistance R7, the 8th resistance R8, the first diode D1,
Two diode D2 and polar capacitor C3, the inverting input of the 5th amplifier U2A is by being sequentially connected in series the 8th resistance R8, the 7th electricity
The outfan of four high guaily unit U1D, the in-phase input end ground connection of the 5th amplifier U2A, the sun of the first diode D1 it is connected to after resistance R7
Pole is connected with the inverting input of the 5th amplifier U2A, and the outfan of negative electrode and the 5th amplifier U2A is connected, the second diode D2's
The negative electrode of anode and the first diode D1 be connected, one end of the first resistance R1 be connected to the 7th resistance R7 and the 8th resistance R8 it
Between, the negative electrode of the other end and the second diode D2 is connected, and the positive terminal of polar capacitor C3 and the negative electrode of the second diode D2 are connected,
Other end ground connection.
A kind of low voltage mutual inductor measurement loop state on_line monitoring system the most according to claim 8, it is characterised in that: institute
State the second voltage follower and include the 6th amplifier U2B, the in-phase input end of the 6th amplifier U2B and the negative electrode phase of the second diode D2
Even, the inverting input of the 6th amplifier U2B is connected with outfan.
A kind of low voltage mutual inductor measurement loop state on_line monitoring system the most according to claim 9, it is characterised in that:
Also include the first two-way transient diode D3 and the second two-way transient diode D4, the one of described first two-way transient diode D3
End is connected with the outfan of the 6th amplifier U2B, other end ground connection；One end of described second two-way transient diode D4 and the 3rd fortune
The in-phase input end putting U1C is connected, other end ground connection.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107527601A (en) * | 2017-09-28 | 2017-12-29 | 深圳市华星光电技术有限公司 | The circuit overcurrent protection and method and liquid crystal display device of GOA circuits |
| CN107612133A (en) * | 2017-10-24 | 2018-01-19 | 长沙捷联飞机维修工程有限公司 | Aviation high-frequency wireless communication system flows redundant power starting with full load system |
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