CN205786954U - Intelligent electric current mutual inductor polarity tester - Google Patents
Intelligent electric current mutual inductor polarity tester Download PDFInfo
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- CN205786954U CN205786954U CN201620490219.9U CN201620490219U CN205786954U CN 205786954 U CN205786954 U CN 205786954U CN 201620490219 U CN201620490219 U CN 201620490219U CN 205786954 U CN205786954 U CN 205786954U
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Abstract
A kind of simple to operate, stable, result of the test intelligent electric current mutual inductor polarity tester intuitively, between positive and negative signal voltage input, it is connected to reversal connection cue circuit and is connected to in-phase proportion amplifier U by current-limiting resistance Rs, between its inverting input and system earth end, being connected to resistance R2, resistance R2By reversal connection diode D1It is connected with negative signal voltage input, at positive signal voltage input and resistance R2Negative terminal between be connected to resistance R1, the outfan of in-phase proportion amplifier U passes through feedback resistance RfIt is connected with its inverting input；It is serially connected with resistance R between the positive and negative power end of in-phase proportion amplifier U4With aneroid battery E1, between positive and negative signal power source input, it is serially connected with self-inspection button AN and aneroid battery E2；Luminous indicating circuit and the auditory tone cues electric circuit with reset function it is connected at in-phase proportion amplifier U outfan；It is connected to stabilivolt D between the positive supply input and system earth end of in-phase proportion amplifier U2。
Description
Technical field
This utility model relates to a kind of intelligent electric current mutual inductor polarity tester, can go out electricity with Validity Test
Current transformer polarity.
Background technology
Along with the development of science and technology, intelligent substation arises at the historic moment, and electric device becomes more intelligence
Energyization.The correctness of CT polarity is directly connected to metering, observing and controlling and protection device secondary circuit and connects
The correctness of line.Especially relay protection and automaton thereof, the correctness of CT polarity is most important.
There are two leading-out terminals first and second side of CT body.The leading-out terminal of either side is wrong, all can
Cause the change that secondary current phase place produces 180 °, it will cause measurement loop inaccurate, protection device
Malfunction or tripping, cause electrical network irregular operation, goes back the safety of entail dangers to equipment and the person time serious.Cause
This, correct judges that CT polarity is the most correctly a very important job.In order to ensure CT pole
Property correctness, at the primary equipment more renewed or when needing to change its electrical secondary system wiring, it is necessary to
Remeasure the polarity of CT, ensure the correctness of CT second loop return wiring with this.
Traditional method is to use aneroid battery test CT polarity, and its principle is for by powering up at CT primary side
Source, makes primary winding excitation and to sense secondary coil charged, by being added in the pointer at second siding ring two ends
It is the most correct that formula DC ammeter measures its faradic direction.I.e. enter at CT primary side aneroid battery
The disconnected operation of row point, observes DC ammeter pointer offset side at CT secondary side needle DC galvanometer
To, by the positively biased of pointer and the reverse-biased correctness judging CT polarity.
The DC ammeter range typically used is 100 μ A, uses 1.5V to the 9V dry cell batteries such as not
Measure.Owing to primary winding internal resistance is excessive, by Ohm's law I=U/R, secondary faradism
Flowing minimum, DC current list index often swings the least even without significantly swinging, and often tests phenomenon
Directly perceived, clear and definite, even cause accurately observing due to the technology mistake of relay protection personnel
Whether CT polarity is correct, and Protection Technology personnel often to expend the more time and carry out judging CT
The correctness of polarity, work difficulty is big.
Utility model content
The purpose of this utility model be to provide a kind of visual, simple to operate, stable, result of the test is straight
The intelligent electric current mutual inductor polarity tester seen, the problem that can effectively solve above-mentioned existence, it is ensured that survey
Test result is accurate, it is possible to effectively save manpower, time, Financial cost.
The technical solution that this utility model relates to is:
A kind of intelligent electric current mutual inductor polarity tester, including positive and negative signal voltage input, it is special
Levy and be: between positive and negative signal voltage input, be connected to in-phase proportion amplifier U by current-limiting resistance Rs,
Signal voltage is added to the in-phase input end of in-phase proportion amplifier U, in-phase proportion by current-limiting resistance Rs
Connect between inverting input and the system earth end of amplifier U and have resistance R2, resistance R2Negative terminal lead to
Cross diode D1It is connected with negative signal voltage input, resistance R2Negative terminal and diode D1Anode phase
Even, at positive signal voltage input and resistance R2Negative terminal between be connected to resistance R1, in-phase proportion amplifies
The outfan of device U passes through feedback resistance RfIt is connected with the inverting input of in-phase proportion amplifier F, electricity
Resistance R2, feedback resistance Rs and in-phase proportion amplifier U constitute series voltage negtive backword amplifying circuit；?
It is serially connected with resistance R between the positive and negative power end of in-phase proportion amplifier U4With aneroid battery E1, just,
Self-inspection button AN and aneroid battery E it is serially connected with between negative signal power input2；At in-phase proportion amplifier
U outfan passes through resistance R3It is connected to luminous indicating circuit and the auditory tone cues electricity with reset function respectively
Road, described luminous indicating circuit and auditory tone cues electric circuit are in parallel；Positive supply at in-phase proportion amplifier U
Stabilivolt D it is connected between input and system earth end2, it is connected between positive and negative signal voltage input
By the resistance R concatenated5With reversal connection light emitting diode D1The reversal connection cue circuit constituted.
Described luminous indicating circuit is by the LED concatenated2Constitute with involution button A, described
Auditory tone cues electric circuit is made up of the buzzer F concatenated and involution button B.
This intelligent electric current mutual inductor polarity tester is amplified current transformer two by in-phase proportion amplifier
Secondary winding faradic current, forms dual principle by buzzer and light emitting diode, involution button comes
Realize reset function, this Novel intelligent current transformer pole can be realized by internal set dry cell batteries
Property tester device self-checking function.Provide the benefit that:
1, simple to operate, it is possible to the accuracy of test result is effectively ensured.Allow the operator to accurately
Learn test result, fundamentally solve traditional dry battery type and observed by needle DC galvanometer
Pointer positively biased or the problem of reverse-biased measurement current transform er polarity DeGrain.Tested by new CT
The light emitting diode of instrument and buzzer can intuitively, significantly determine correctness and then the guarantee of CT polarity
Power system normal operation.
2, simple in construction, possesses higher Stability and dependability.
3, there is self-checking function, it is possible to when ensureing to break down inside tester, do not mislead specialty skill
The judgement of art personnel, thus it is effectively improved work efficiency and process quality.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present utility model；
Fig. 2 is series voltage negtive backword amplification circuit structure schematic diagram of the present utility model.
Detailed description of the invention
As depicted in figs. 1 and 2, this intelligent electric current mutual inductor polarity tester, including positive and negative signal
Voltage input end 1,2, is connected to by current-limiting resistance Rs between positive and negative signal voltage input 1,2
In-phase proportion amplifier U, signal voltage is added to the same of in-phase proportion amplifier F by current-limiting resistance Rs
Phase input, connects between inverting input and the system earth end of in-phase proportion amplifier U and has resistance
R2, resistance R2Negative terminal by diode D1It is connected with negative signal voltage input 2, resistance R2Negative
End and diode D1Anode be connected, at positive signal voltage input 1 and resistance R2Negative terminal indirectly
There is resistance R1, the outfan of in-phase proportion amplifier U passes through feedback resistance RfWith in-phase proportion amplifier
The inverting input of U is connected, resistance R2, feedback resistance Rs and in-phase proportion amplifier U constitute voltage
Series negative feedback amplifying circuit；It is serially connected with resistance between the positive and negative power end of in-phase proportion amplifier U
R4With aneroid battery E1, be serially connected with between positive and negative signal power source input 1,2 self-inspection button AN and
Aneroid battery E2；By increasing by one group of aneroid battery and self-inspection button, by dry cell power supply, simulated field is actual
The charged situation of CT second siding ring, can make this CT polarity tester possess self-checking function.As long as pressing
Lower self-inspection button, this CT polarity tester light emitting diode will operate respectively with buzzer, with detection
Whether fault is there is inside CT polarity test instrument apparatus.
At in-phase proportion amplifier U outfan by resistance R3It is connected to luminous indicating circuit and sound respectively
Cue circuit, described luminous indicating circuit and auditory tone cues electric circuit parallel connection, and luminous indicating circuit and sound
The other end welding system earth terminal of cue circuit, described luminous indicating circuit is by the light emitting diode concatenated
LED2Constituting with involution button A, described auditory tone cues electric circuit is by the buzzer F concatenated and involution button
B is constituted；After having electric current to enter in-phase proportion amplifier U, LED2Luminous also self-insurance
Hold, buzzer F buzzing self-sustaining.Only when pressing involution button A, B respectively, just can make to send out
Optical diode LED2Quit work respectively with buzzer F.Use that light emitting diode is in parallel with buzzer returns
Road, can effectively realize dual function, may insure that tester keeps after breaking down in a loop
Effectively (such as during the adhesion of involution button node, that can all cross two loops relatively guarantees electric current in work
The correctness of mutual inductor polarity).By lumination of light emitting diode and buzzer buzzing, can be directly perceived, bright
Really, open-and-shut judge that current transformer polarity is the most correct.
It is connected to stabilivolt D between the positive supply input and system earth end of in-phase proportion amplifier U2,
Characteristic based on stabilivolt, after i.e. stabilivolt punctures, its both end voltage is held essentially constant.So work as handle
After stabilivolt accesses circuit, if owing to supply voltage fluctuates, or other reasons causes in circuit each
During point voltage variation, the voltage at load two ends is held essentially constant.Therefore, at in-phase proportion amplifier
Outfan connects a stabilivolt to ensure stablizing of output voltage.
It is connected to by the resistance R concatenated between positive and negative signal voltage input 1,25With reversal connection luminescence two
Pole pipe D1The reversal connection cue circuit constituted.To prevent from going out at positive and negative signal voltage input 1, at 2
Existing CT head and the tail test wire wiring error, causes this tester to occur inaccurate phenomenon in measurement result.
Because diode has directivity, when electric current inflow direction is forward, its impedance can be ignored, whole
Loop can be considered as conducting；When electric current inflow direction is reverse, its impedance is very big, and whole loop is permissible
It is considered as open circuit.At positive and negative signal voltage input 1,2, test wire connects instead, and this tester passes through two
Pole pipe characteristic is judged as broken string state, and now tester will not normally work.
During on-the-spot application, secondary winding in current transformer head end and tail end are respectively connected to positive and negative signal voltage defeated
Enter end points 1,2.Signal voltage Vs is added to the in-phase input end of in-phase proportion amplifier U by resistance Rs,
Output voltage Vo feeds back to the inverting input of in-phase proportion amplifier U by resistance R2 and Rf, and then
Being amplified by Weak current, the electric current after amplification can order about light emitting diode lamp and buzzer
Element is operated.Luminous indicating lamp LED when instrument for testing polarity of current transformer2Brighten and buzzer F
When sending buzzing, it was demonstrated that now current transformer polarity is correct.When pressing involution button A, B respectively, luminous
Display lamp LED2 extinguishes and stops buzzing.Before using, by this instrument for testing polarity of current transformer every time
Self-inspection button AN to proofread the duty of tester the best.After pressing self-inspection button AN, if
Luminous indicating lamp LED2Brighten, buzzer F buzzing, it was demonstrated that now tester is in normal operating conditions, permissible
Relieved use.
These are only specific embodiment of the utility model, be not limited to this utility model, for
For those skilled in the art, this utility model can have various modifications and variations.All at this utility model
Spirit and principle within, any modification, equivalent substitution and improvement etc. made, should be included in this practicality
Within novel protection domain.
Claims (2)
1. an intelligent electric current mutual inductor polarity tester, including positive and negative signal voltage input, its
Feature is: is connected to in-phase proportion by current-limiting resistance Rs between positive and negative signal voltage input and amplifies
Device U, signal voltage is added to the in-phase input end of in-phase proportion amplifier U by current-limiting resistance Rs, with
Connect between inverting input and the system earth end of Phase Proportion amplifier U and have resistance R2, resistance R2's
Negative terminal passes through diode D1It is connected with negative signal voltage input, resistance R2Negative terminal and diode D1
Anode be connected, at positive signal voltage input and resistance R2Negative terminal between be connected to resistance R1, homophase
The outfan of proportional amplifier U passes through feedback resistance RfInverting input with in-phase proportion amplifier F
It is connected, resistance R2, feedback resistance Rs and in-phase proportion amplifier U constitute series voltage negtive backword and amplify
Circuit；It is serially connected with resistance R between the positive and negative power end of in-phase proportion amplifier U4With aneroid battery E1,
Self-inspection button AN and aneroid battery E it is serially connected with between positive and negative signal power source input2；At in-phase proportion
Amplifier U outfan passes through resistance R3It is connected to luminous indicating circuit and the sound with reset function respectively
Cue circuit；It is connected to voltage stabilizing between the positive supply input and system earth end of in-phase proportion amplifier U
Pipe D2, it is connected to by the resistance R concatenated between positive and negative signal voltage input5With reversal connection light-emitting diodes
Pipe D1The reversal connection cue circuit constituted.
Intelligent electric current mutual inductor polarity tester the most according to claim 1, is characterized in that: institute
Stating luminous indicating circuit and auditory tone cues electric circuit is in parallel, described luminous indicating circuit is by the light-emitting diodes concatenated
Pipe LED2Constituting with involution button A, described auditory tone cues electric circuit is pressed by the buzzer F concatenated and involution
Button B is constituted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620490219.9U CN205786954U (en) | 2016-05-25 | 2016-05-25 | Intelligent electric current mutual inductor polarity tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620490219.9U CN205786954U (en) | 2016-05-25 | 2016-05-25 | Intelligent electric current mutual inductor polarity tester |
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| CN205786954U true CN205786954U (en) | 2016-12-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201620490219.9U Active CN205786954U (en) | 2016-05-25 | 2016-05-25 | Intelligent electric current mutual inductor polarity tester |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106066449A (en) * | 2016-05-25 | 2016-11-02 | 国网辽宁省电力有限公司检修分公司 | Intelligent electric current mutual inductor polarity tester |
| CN107677929A (en) * | 2017-07-14 | 2018-02-09 | 国网浙江省电力公司嘉兴供电公司 | A kind of mutual inductor polarity test system |
-
2016
- 2016-05-25 CN CN201620490219.9U patent/CN205786954U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106066449A (en) * | 2016-05-25 | 2016-11-02 | 国网辽宁省电力有限公司检修分公司 | Intelligent electric current mutual inductor polarity tester |
| CN107677929A (en) * | 2017-07-14 | 2018-02-09 | 国网浙江省电力公司嘉兴供电公司 | A kind of mutual inductor polarity test system |
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