CN205898869U - Take zero sequence voltage output's resistive voltage divider formula three -phase combination voltage transformer - Google Patents
Take zero sequence voltage output's resistive voltage divider formula three -phase combination voltage transformer Download PDFInfo
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- CN205898869U CN205898869U CN201620787853.9U CN201620787853U CN205898869U CN 205898869 U CN205898869 U CN 205898869U CN 201620787853 U CN201620787853 U CN 201620787853U CN 205898869 U CN205898869 U CN 205898869U
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Abstract
The utility model discloses a take zero sequence voltage output's resistive voltage divider formula three -phase combination voltage transformer, including A looks resistance voltage divider, B looks resistance voltage divider, C looks resistance voltage divider, protection and signal conditioning circuit, adc, microprocessor, RS485 communication interface and public zero sequence resistance, the protection has six signal input part and four ways signal output part mouth with signal conditioning circuit, and the protection is formed by putting magnetron, piezo -resistor, voltage follower, differential amplification circuit and low pass filter circuit with signal conditioning circuit, digital analog converter in the future self preservation protects and converts corresponding data signal to with signal conditioning circuit's voltage signal, and microprocessor receives data signal and zero -sequence voltage data signal, exports through RS485 communication interface. The utility model discloses output simultaneously becomes the digital quantity that linear scale concerns with each the looks primary voltage who contains the harmonic, can measure the zero -sequence voltage, can conveniently carry out phase voltage partial pressure zero -sequence voltage intrinsic standoff ratio checksum error adjustment when.
Description
Technical field
This utility model is related to electromagnetic measurement device, more particularly, to a kind of three-phase voltage and residual voltage of simultaneously measuring
Electric resistance partial pressure type three-phase combination voltage transformer.
Background technology
Voltage transformer is mainly used in electric energy metrical, power quality analysis and the safeguard protection of electrical network.For three-phase line,
In addition to needing to measure the voltage of each phase in addition it is also necessary to the monitoring degree of unbalancedness of three phase supply voltage and Single Phase Metal ground connection and
The faults such as phase shortage are it is therefore desirable to measure residual voltage.The existing three-phase combination voltage transformer with residual voltage output is generally adopted
With the star-like connection of three single-phase electricity electromagnetic type voltage transformers and a neutral point is come by zero sequence electromagnetic potential transformer ground connection
Realize.When the fault such as three phase supply Voltage unbalance and generation Single Phase Metal ground connection and phase shortage, zero sequence electromagnetic potential is mutual
Sensor secondary side exports residual voltage by a certain percentage.This structure and the mode of connection require these single-phase electricity magnetic-type mutual induction of voltage
The performance of device is consistent, has thus resulted in that existing product is excessively heavy, bulky and the shortcomings of high material consumption, and overall pours
The electric property of casting product is poor, and shelf depreciation test passes rate is low.Additionally, this electromagnetic type three-phase group with residual voltage output
Close the problem that voltage transformer equally exists the conventional electromagnetic combination voltage transformers such as saturation, the narrow, ferromagnetic resonance of frequency band.Using
The electronic type voltage transformer of electric resistance partial pressure has the advantages that unsaturation, linearity height, bandwidth, energy consumption be little, no ferromagnetic resonance,
Currently progressively substitute traditional electromagnetic potential transformer.Because resistance has temperature drift, it is desirable to resistance divides
The high-voltage arm resistance of depressor and low-voltage arm resistance temperature drift characteristic are as far as possible close, and usual high-voltage arm resistance and low-voltage arm resistance can be same
Disposably complete on one base material such as tubular or flaky pottery body, this resitstance voltage divider has single output port, at present
This resitstance voltage divider through epoxide resin vacuum casting and the simple device such as resistance and electric capacity series and parallel it is possible to
Constitute electronic single-phase voltage transformer, and the measurement for phase voltage.The utility model proposes one kind is same tubular
Or the electric resistance partial pressure on flaky pottery body, the high-voltage arm resistance of series connection, low-voltage arm resistance and zero sequence resistance disposably completing
Device, this resitstance voltage divider has two output ports, by certain mode of connection by three this kind of resitstance voltage dividers and
One public zero sequence resistance connects into primary transducer, the output signal of primary transducer is processed it is achieved that to containing humorous
The three-phase voltage of ripple and the accurate measurement of residual voltage, can be used for monitoring that three-phase line supply voltage is uneven and Single Phase Metal connects
Earth fault and open-phase fault.Because high-voltage arm resistance, low-voltage arm resistance and zero sequence resistance are integral productions, therefore their temperature
Drift characteristic can be made as far as possible close.Additionally, this resitstance voltage divider with two output ports can design as standard component
Make, and can easily the phase voltage intrinsic standoff ratio to single two output port resitstance voltage dividers and residual voltage intrinsic standoff ratio
Verified, be conducive to the quality control of primary transducer.And for the electric resistance partial pressure with residual voltage output that completes
Formula three-phase combination voltage transformer, can be by being verified by the method mutually detecting.Such band residual voltage output at present
Electric resistance partial pressure type three-phase combination voltage transformer there are no patent and document report.
Utility model content
This utility model main purpose is to provide a kind of electric resistance partial pressure type three-phase combination voltage with residual voltage output
Transformer, it can export the digital quantity linearly proportional with each phase primary voltage containing harmonic wave simultaneously, can measure simultaneously
Residual voltage, for monitoring that three-phase line supply voltage is uneven and Single Phase Metal is grounded and the faults such as phase shortage.
This utility model is directed to what prior art problem was mainly addressed by following technical proposals, a kind of band zero sequence
The electric resistance partial pressure type three-phase combination voltage transformer of voltage output, electric including a phase resistance potentiometer, b phase resistance potentiometer, c phase
Resistance potentiometer, protection and signal conditioning circuit, analog-digital converter, microprocessor, rs485 communication interface and public zero sequence resistance；a
Phase resistance potentiometer, b phase resistance potentiometer, c phase resistance potentiometer and public zero sequence resistance constitute the primary transducer of transformer；
A phase resistance potentiometer is made up of a phase high-voltage arm resistance, a phase low-voltage arm resistance and a phase zero sequence resistant series, b phase resistance potentiometer
It is made up of b phase high-voltage arm resistance, b phase low-voltage arm resistance and b phase zero sequence resistant series, c phase resistance potentiometer is by c phase high-voltage arm electricity
Resistance, c phase low-voltage arm resistance and c phase zero sequence resistant series composition, a phase high-voltage arm resistance, b phase high-voltage arm resistance and c phase high-voltage arm
The resistance value of resistance is identical, and a phase low-voltage arm resistance, b phase low-voltage arm resistance are identical with the resistance value of c phase low-voltage arm resistance, a phase zero
The resistance value of sequence resistance, b phase zero sequence resistance and c phase zero sequence resistance can differ, a phase zero sequence resistance, b phase zero sequence resistance, c phase
The resistance value of zero sequence resistance and public zero sequence resistance can be the infinity of off-state, but can not be infinity simultaneously；Protect
Shield and signal conditioning circuit have six signal input parts and four road signal output ports, and protection and signal conditioning circuit are by discharging
Pipe, varistor, voltage follower, differential amplifier circuit and low-pass filter circuit composition；One termination a of a phase high-voltage arm resistance
Phase voltage, another termination a phase voltage of a phase high-voltage arm resistance measures one end of outfan and a phase low-voltage arm resistance, a phase low pressure
The other end of arm resistance and a phase residual voltage measure outfan and one end of a phase zero sequence resistance is connected, a phase zero sequence resistance another
One end is grounded, a termination b phase voltage of b phase high-voltage arm resistance, and the other end of b phase high-voltage arm resistance is exported with the measurement of b phase voltage
End is connected with one end of b phase low-voltage arm resistance, and another termination b phase residual voltage of b phase low-voltage arm resistance measures outfan and b phase
One end of zero sequence resistance, the other end ground connection of b phase zero sequence resistance, a termination c phase voltage of c phase high-voltage arm resistance, c phase high-voltage arm
The other end of resistance and c phase voltage measure outfan and one end of c phase low-voltage arm resistance is connected, c phase low-voltage arm resistance another
Termination c phase residual voltage measures one end of outfan and c phase zero sequence resistance, the other end ground connection of c phase zero sequence resistance, a phase voltage
Measurement outfan, b phase voltage measure outfan and c phase voltage measure outfan respectively with protection and the first of signal conditioning circuit
Signal input part, secondary signal input and the 3rd signal input part are connected, one end of public zero sequence resistance, a phase zero sequence electricity
Pressure measurement outfan, b phase residual voltage measure outfan, c phase residual voltage measurement outfan, protection and signal conditioning circuit
4th signal input part and the 5th signal input part link together, other end ground connection, protection and the signal of public zero sequence resistance
6th signal input part of modulate circuit is connected to the ground, the first signal input part of protection and signal conditioning circuit, the second letter
Number input, the 3rd signal input part and the 4th signal input part constitute the three-phase with the 4th signal input part as reference potential
Voltage measurement port, protection is constituted with the 5th signal input part of signal conditioning circuit and the 6th signal input part with the 6th letter
Number input is the residual voltage measurement port of reference potential, the voltage of digital to analog converter self-shield in future and signal conditioning circuit
Signal is converted into corresponding digital signal, and microprocessor receives three-phase voltage digital signal and residual voltage digital signal, and leads to
Cross the output of rs485 communication interface.
Below the principle of the technical program is described further.
It is assumed that a phase high-voltage arm resistance ra2, b phase high-voltage arm resistance rb2With c phase high-voltage arm resistance rc2Equal, i.e. ra2=rb2=
rc2=r2, a phase low-voltage arm resistance r simultaneouslya1, b phase low-voltage arm resistance rb1With c phase low-voltage arm resistance rc1Equal, i.e. ra1=rb1=
rc1=r1, by a phase zero sequence resistance ra0, b phase zero sequence resistance rb0, c phase zero sequence resistance rc0With public zero sequence resistance rg0Constitute is equivalent
Parallel resistance is r0, then for the voltage u of the 4th and the 5th signal input part of signal conditioning circuit0Have:
I.e.
Can be seen that u from formula (2)0For the three-phase residual voltage exporting by a certain percentage.
The first signal input terminal voltage u for signal conditioning circuita, when with the 4th signal input of signal conditioning circuit
End d voltage u0During for reference voltage, have:
In the same manner, for the secondary signal input terminal voltage u of signal conditioning circuitbVoltage u with the 3rd signal input partc, can
To obtain and formula (3) identical formula, then have:
From formula (4), formula (5) and formula (6) as can be seen that during when the three phase supply balance of voltage and no Single Phase Metal ground connection or lack
During equal fault, u0=0, now ua-u0、ub-u0And uc-u0For each phase voltage exporting by a certain percentage.When three phase supply electricity
When pressure is uneven or when there is to include Single Phase Metal ground connection or open-phase fault, u0≠ 0, now ua-u0、ub-u0And uc-u0Except pressing
Certain proportion exports outside each phase voltage, is also jointly superimposed a residual voltage exporting by a certain percentage.
It is assumed that the load voltage value of three-phase voltage measurement port and residual voltage measurement port is close in design, due toCan be obtained by formula (4), formula (5), formula (6) and formula (2), require in accuracy of measurement
The residual voltage proportional component of this superposition can be ignored in the case of not high, and when needing accurately to measure, it is possible to use micro-
Processor is to ua-u0、ub-u0And uc-u0Signal all addsThen can also be accurate in the case of containing residual voltage
Really obtain the voltage measurement signal of each phase:
From formula (7), formula (8) and formula (9), each phase voltage measurement signal and primary voltage instantaneous value are linearly closed
System, therefore can be after microprocessor processes, and this transformer can export with each phase primary voltage containing harmonic wave linearly
The digital quantity of relation.
From formula (2), formula (7), formula (8) and formula (9), the three-phase voltage signal of this transformer and residual voltage signal pass
Sense determines than the resistance by two output port resitstance voltage dividers, therefore can respectively high-voltage arm resistance be constituted with low-voltage arm resistance
Intrinsic standoff ratio, high-voltage arm resistance and low-voltage arm resistance series connection after with zero sequence resistance constitute intrinsic standoff ratio detected, thus side
Just the phase voltage intrinsic standoff ratio and residual voltage intrinsic standoff ratio of single two output port resitstance voltage dividers is verified.And for
The primary transducer of the electric resistance partial pressure type three-phase combination voltage transformer with residual voltage output completing, can be by wheel
Stream, to each mutually independent applied voltage, detects phase voltage intrinsic standoff ratio and the residual voltage intrinsic standoff ratio of this phase, now notes zero sequence electricity
Hindering is three-phase zero sequence resistance and public zero sequence resistance is formed in parallel.
Preferably, a phase resistance potentiometer, b phase resistance potentiometer and c phase resistance potentiometer are integrated making, that is, same
One tubular or flaky pottery body on the high-voltage arm resistance of resitstance voltage divider, low-voltage arm resistance made together with zero sequence resistance
Become；A phase resistance potentiometer, b phase resistance potentiometer adopt identical structure, identical material and identical making with c phase resistance potentiometer
Technical process completes, and the high-voltage arm resistance of each phase resistance potentiometer, low-voltage arm resistance and zero sequence resistance are purely resistive no
Sensing resistor, the temperature drift rate of these resistance need to be less than 50ppm/ DEG C, the specified electricity that high-voltage arm resistance and low-voltage arm resistance flow through
Flow for 1ma.
Preferably, a phase resistance potentiometer, b phase resistance potentiometer and c phase resistance potentiometer carry out vacuum asphalt mixtures modified by epoxy resin respectively
Fat is poured into a mould, and a phase resistance potentiometer, b phase resistance potentiometer and c phase resistance potentiometer are separately fixed at same metallic ground
On plate.
Preferably, when residual voltage accuracy of measurement requires better than 1 grade, a phase zero sequence resistance, b phase zero sequence resistance and c
The resistance of phase zero sequence resistance is equal, and does not adopt public zero sequence resistance.
Preferably, when residual voltage accuracy of measurement requires less than or equal to 1 grade, a phase zero sequence resistance, b phase zero sequence
The resistance of resistance and c phase zero sequence resistance is infinity, now adopts public zero sequence resistance to export residual voltage proportional component.
Preferably, the specified measurement output voltage values of a phase voltage, b phase voltage and c voltage areNominal load
For 20m ω, when there is Single Phase Metal ground connection, the specified measurement output voltage values of residual voltage are 6.5v, and nominal load is 20m
ω.
This utility model can be used for rated voltage with the electric resistance partial pressure type three-phase combination voltage transformer that residual voltage exports
Up to 35kv, frequency is each phase voltage of 50hz three phase network and the measurement of residual voltage, a phase voltage, b phase voltage and c voltage
Maximum rated measurement output voltage values be 6.5v, maximum rated load be 1m ω, when occur Single Phase Metal ground connection when, zero sequence electricity
The maximum rated measurement output voltage values of pressure are 6.5v, and maximum rated load is 1m ω, and each phase voltage of three phase network and zero sequence are electric
The accuracy of measurement of pressure is all up to 0.2 grade.
The beneficial effect that this utility model brings is, the electric resistance partial pressure type three-phase combination voltage that (1) exports with residual voltage
Transformer is mainly made up of three identicals two output port resitstance voltage divider, and resitstance voltage divider is by high-voltage arm resistance, low-voltage arm
Resistance and zero sequence resistance are in series.With the biography being made up of four single-phase electricity electromagnetic type voltage transformers with identical measurement function
The electromagnetic type three-phase combination voltage transformer of regiment commander's residual voltage output compares, with the electric resistance partial pressure type three of residual voltage output
Combined voltage transformer has that structure is simple, lightweight, easy for installation, do not need iron core and enamel-covered wire, iron-free magnetic saturation existing
As the advantages of, and transformer own loss very little；(2) due to high-voltage arm resistance, the low-voltage arm resistance and zero of resitstance voltage divider
Integral production on same tubular or flaky pottery body completes sequence resistance simultaneously, and high-voltage arm resistance, low-voltage arm resistance and zero
Sequence resistance adopts identical resistance material, high-voltage arm resistance on therefore same resitstance voltage divider, low-voltage arm resistance and zero sequence electricity
The temperature drift rate of resistance has preferable concordance, and this three resistance integrated design thoughts and manufacture method are simultaneously accurate
Measurement three-phase voltage and residual voltage provide guarantee；(3) the electromagnetic type three-phase combination voltage of conventional belt residual voltage output is mutual
Sensor needs to make performance identical single-phase electricity electromagnetic type voltage transformer, and the electric resistance partial pressure type three-phase group with residual voltage output
Close voltage transformer to only need to make three identical resitstance voltage dividers, processing technology is relatively easy, is conducive to the control of quality；
(4) compared to the electromagnetic type three-phase combination voltage transformer of conventional belt residual voltage output, the resistance with residual voltage output divides
The error compensating method of pressure type three-phase combination voltage transformer is simple, by respectively to each phase low-voltage arm resistance and zero sequence resistance string
Parallel resistance and electric capacity is it is possible to reach the purpose of alignment error, it is to avoid the compensation to iron core nonlinearity erron.(5) design
Make the high-voltage arm resistance of three resitstance voltage dividers equal and low-voltage arm resistance resistance is equal during making, and each phase resistance is divided
The voltage measurement port of depressor loads very little it is ensured that the accuracy of residual voltage measurement, overcomes conventional belt residual voltage defeated
The electromagnetic type three-phase combination voltage transformer going out is carried out during residual voltage measurement due to special between single-phase electricity electromagnetic type voltage transformer
The error problem that the difference of property and load causes；(6) by the electric resistance partial pressure ratio inspection to single two output port resitstance voltage dividers
Survey, and the primary transducer to the electric resistance partial pressure type three-phase combination voltage transformer with residual voltage output that completes
The detection of each phase resistance intrinsic standoff ratio, can easily carry out verification and the mistake of phase voltage intrinsic standoff ratio and residual voltage intrinsic standoff ratio
Difference adjustment.
Brief description
Fig. 1 is a kind of principle assumption diagram of the present utility model.
In figure: 1 is a phase resistance potentiometer, 2 is b phase resistance potentiometer, and 3 is c phase resistance potentiometer, and 4 is protection and signal
Modulate circuit, 5 is analog-digital converter, and 6 is microprocessor, and 7 is rs485 communication interface, and 8 is public zero sequence resistance, and 9 is that a phase is high
Pressure arm resistance, 10 is a phase low-voltage arm resistance, and 11 is a phase zero sequence resistance, and 12 is b phase high-voltage arm resistance, and 13 is b phase low-voltage arm electricity
Resistance, 14 is b phase zero sequence resistance, and 15 is c phase high-voltage arm resistance, and 16 is c phase low-voltage arm resistance, and 17 is c phase zero sequence resistance, and 18 is one
Secondary sensor.
Specific embodiment
Below by embodiment, and combine accompanying drawing, the technical solution of the utility model is further described in detail.
Embodiment: as shown in figure 1, this utility model is that the electric resistance partial pressure type three-phase combination voltage with residual voltage output is mutual
Sensor.
A phase resistance potentiometer 1, b phase resistance potentiometer 2, c phase resistance potentiometer 3, protection and signal conditioning circuit 4, modulus
Transducer 5, microprocessor 6, rs485 communication interface 7 and public zero sequence resistance 8；A phase resistance potentiometer 1, b phase resistance potentiometer
2nd, the primary transducer 18 of c phase resistance potentiometer 3 and public zero sequence resistance 8 composition transformer；A phase resistance potentiometer 1 is high by a phase
Pressure arm resistance 9, a phase low-voltage arm resistance 10 and a phase zero sequence resistance 11 are composed in series, and b phase resistance potentiometer 2 is by b phase high-voltage arm electricity
Resistance 12, b phase low-voltage arm resistance 13 and b phase zero sequence resistance 14 are composed in series, and c phase resistance potentiometer 3 is by c phase high-voltage arm resistance 15, c
Phase low-voltage arm resistance 16 and c phase zero sequence resistance 17 are composed in series, a phase high-voltage arm resistance 9, b phase high-voltage arm resistance 12 and c phase high pressure
The resistance value of arm resistance 15 is identical, the resistance value of a phase low-voltage arm resistance 10, b phase low-voltage arm resistance 13 and c phase low-voltage arm resistance 16
Identical, the resistance value of a phase zero sequence resistance 11, b phase zero sequence resistance 14 and c phase zero sequence resistance 17 can differ, a phase zero sequence resistance
11st, the resistance value of b phase zero sequence resistance 14, c phase zero sequence resistance 17 and public zero sequence resistance 8 can be the infinity of off-state,
But can not be infinity simultaneously；Protection and signal conditioning circuit 4 have six signal input parts and four road signal output ports,
Protection and signal conditioning circuit 4 are by discharge tube, varistor, voltage follower, differential amplifier circuit and low-pass filter circuit group
Become；One termination a phase voltage of a phase high-voltage arm resistance 9, the other end of a phase high-voltage arm resistance 9 and a phase voltage measurement outfan and a
One end of phase low-voltage arm resistance 10 is connected, and the other end of a phase low-voltage arm resistance 10 measures outfan and a phase with a phase residual voltage
One end of zero sequence resistance 11 is connected, the other end ground connection of a phase zero sequence resistance 11, and a termination b phase of b phase high-voltage arm resistance 12 is electric
Pressure, the other end of b phase high-voltage arm resistance 12 measures outfan with b phase voltage and one end of b phase low-voltage arm resistance 13 is connected, b phase
The other end of low-voltage arm resistance 13 measures outfan with b phase residual voltage and one end of b phase zero sequence resistance 14 is connected, b phase zero sequence
The other end ground connection of resistance 14, a termination c phase voltage, the other end of c phase high-voltage arm resistance 15 and the c of c phase high-voltage arm resistance 15
Phase voltage measurement outfan is connected with one end of c phase low-voltage arm resistance 16, the other end of c phase low-voltage arm resistance 16 and c phase zero sequence
Voltage measurement outfan is connected with one end of c phase zero sequence resistance 17, the other end ground connection of c phase zero sequence resistance 17, and a phase voltage measures
Outfan, b phase voltage measure outfan and c phase voltage measures the first letter respectively with protection and signal conditioning circuit 4 for the outfan
Number input, secondary signal input and the 3rd signal input part are connected, one end of public zero sequence resistance 8, a phase residual voltage
Measurement outfan, b phase residual voltage measure outfan, c phase residual voltage measurement outfan, protection and signal conditioning circuit 4
4th signal input part and the 5th signal input part link together, other end ground connection, protection and the signal of public zero sequence resistance 8
6th signal input part of modulate circuit 4 is connected to the ground, protection and the first signal input part of signal conditioning circuit 4, second
Signal input part, the 3rd signal input part and the 4th signal input part constitute with the 4th signal input part as reference potential three
Phase voltage measurement port, protection and the 5th signal input part of signal conditioning circuit 4 and the 6th signal input part constitute with the
Six signal input parts are the residual voltage measurement port of reference potential, digital to analog converter self-shield in 5 future and signal conditioning circuit 4
Voltage signal be converted into corresponding digital signal, microprocessor 6 receives three-phase voltage digital signal and residual voltage numeral letter
Number, and exported by rs485 communication interface 7.
The present embodiment specific design parameter is: rated voltage 10kv, rated frequency 50hz, a phase voltage measurement outfan, b
Phase voltage measures outfan and the load voltage value of c voltage measurement outfan isNominal load is 20m ω, accuracy
For 0.2 grade, when Single Phase Metal ground connection occurs, the load voltage value that residual voltage measures outfan is 6.5v, and nominal load is
20m ω, accuracy is 0.5 grade, and the resistance value of a phase high-voltage arm resistance 9, b phase high-voltage arm resistance 12 and c phase high-voltage arm resistance 15 is equal
For 57.7m ω, the resistance value of a phase low-voltage arm resistance 10, b phase low-voltage arm resistance 13 and c phase low-voltage arm resistance 16 is 37.5k
The resistance value of ω, a phase zero sequence resistance 11, b phase zero sequence resistance 14 and c phase zero sequence resistance 17 is 65.1k ω, the temperature of each resistance
Degree drift rate is 50ppm/ DEG C, and the resistance value of public zero sequence resistance 8 is the infinity of off-state.A phase resistance potentiometer 1, b phase
Resitstance voltage divider 2, c phase resistance potentiometer 3 and public zero sequence resistance 8 constitute the primary transducer 18 of transformer.Band residual voltage
The rated value of each phase voltage digital output of electric resistance partial pressure type three-phase combination voltage transformer of output is 2d41h, zero sequence electricity
The rated value of pressure digital output is 2d41h, and microprocessor 6 adopts the digital signal processor that operating frequency is 300mhz, mould
Number converter 5 adopts 16, six tunnel adc, and protection is 3khz with the cut-off frequency of each low pass filter in signal conditioning circuit 4, mould
The sample frequency of number converter 5 is 100khz.
The content not being described in detail in this utility model description belongs to the known technology of those skilled in the art.
It is understood that above-described embodiment is to explanation of the present utility model, rather than to of the present utility model
Limit, the utility model in any spirit without departing from this utility model is created, and each falls within protection of the present utility model
Within the scope of.
Claims (6)
1. a kind of with residual voltage output electric resistance partial pressure type three-phase combination voltage transformer it is characterised in that: include a phase resistance
Potentiometer, b phase resistance potentiometer, c phase resistance potentiometer, protection with signal conditioning circuit, analog-digital converter, microprocessor,
Rs485 communication interface and public zero sequence resistance；A phase resistance potentiometer, b phase resistance potentiometer, c phase resistance potentiometer and public zero
Sequence resistance constitutes the primary transducer of transformer；A phase resistance potentiometer is by a phase high-voltage arm resistance, a phase low-voltage arm resistance and a phase
Zero sequence resistance is composed in series, and b phase resistance potentiometer is by b phase high-voltage arm resistance, b phase low-voltage arm resistance and b phase zero sequence resistant series
Composition, c phase resistance potentiometer is made up of c phase high-voltage arm resistance, c phase low-voltage arm resistance and c phase zero sequence resistant series, a phase high pressure
Arm resistance, b phase high-voltage arm resistance are identical with the resistance value of c phase high-voltage arm resistance, a phase low-voltage arm resistance, b phase low-voltage arm resistance and
The resistance value of c phase low-voltage arm resistance is identical, and the resistance value of a phase zero sequence resistance, b phase zero sequence resistance and c phase zero sequence resistance can not
Identical, a phase zero sequence resistance, the resistance value of b phase zero sequence resistance, c phase zero sequence resistance and public zero sequence resistance can be off-state
Infinity, but can not simultaneously be infinity；Protection and signal conditioning circuit have six signal input parts and four road signals
Output port, protection and signal conditioning circuit are by discharge tube, varistor, voltage follower, differential amplifier circuit and low pass filtered
Wave circuit forms；One termination a phase voltage of a phase high-voltage arm resistance, another termination a phase voltage measurement of a phase high-voltage arm resistance is defeated
Go out one end of end and a phase low-voltage arm resistance, the other end of a phase low-voltage arm resistance measures outfan and a phase zero with a phase residual voltage
One end of sequence resistance is connected, the other end ground connection of a phase zero sequence resistance, a termination b phase voltage of b phase high-voltage arm resistance, b phase high pressure
The other end of arm resistance and b phase voltage measure outfan and one end of b phase low-voltage arm resistance is connected, b phase low-voltage arm resistance another
One termination b phase residual voltage measures one end of outfan and b phase zero sequence resistance, the other end ground connection of b phase zero sequence resistance, and c phase is high
One termination c phase voltage of pressure arm resistance, the other end of c phase high-voltage arm resistance and c phase voltage measure outfan and c phase low-voltage arm electricity
One end of resistance is connected, and another termination c phase residual voltage of c phase low-voltage arm resistance measures one end of outfan and c phase zero sequence resistance,
The other end ground connection of c phase zero sequence resistance, a phase voltage measurement outfan, b phase voltage measurement outfan and the measurement output of c phase voltage
End is connected with the first signal input part of signal conditioning circuit, secondary signal input and the 3rd signal input part with protection respectively
Connect, one end of public zero sequence resistance, a phase residual voltage measurement outfan, b phase residual voltage measurement outfan, c phase residual voltage
Measurement outfan, protection are linked together with the 4th signal input part of signal conditioning circuit and the 5th signal input part, public
The other end ground connection of zero sequence resistance, protection is connected to the ground with the 6th signal input part of signal conditioning circuit, protects and signal
First signal input part of modulate circuit, secondary signal input, the 3rd signal input part and the 4th signal input part constitute
Three-phase voltage measurement port with the 4th signal input part as reference potential, the 5th signal input of protection and signal conditioning circuit
End and the 6th signal input part constitute the residual voltage measurement port with the 6th signal input part as reference potential, digital-to-analogue conversion
Device self-shield in future is converted into corresponding digital signal with the voltage signal of signal conditioning circuit, and microprocessor receives three-phase voltage
Digital signal and residual voltage digital signal, and exported by rs485 communication interface.
2. a kind of electric resistance partial pressure type three-phase combination voltage transformer with residual voltage output according to claim 1, its
It is characterised by: a phase resistance potentiometer, b phase resistance potentiometer and c phase resistance potentiometer are integrated making, that is, same tubular
Or the high-voltage arm resistance of resitstance voltage divider, low-voltage arm resistance complete together with zero sequence resistance on flaky pottery body；A phase resistance
Potentiometer, b phase resistance potentiometer adopt identical structure, identical material and identical processing technology process system with c phase resistance potentiometer
Complete, the high-voltage arm resistance of each phase resistance potentiometer, low-voltage arm resistance and zero sequence resistance are purely resistive noninductive resistance, these
The temperature drift rate of resistance need to be less than 50ppm/ DEG C, and the rated current that high-voltage arm resistance and low-voltage arm resistance flow through is 1ma.
3. a kind of electric resistance partial pressure type three-phase combination voltage transformer with residual voltage output according to claim 1 and 2,
It is characterized in that: a phase resistance potentiometer, b phase resistance potentiometer and c phase resistance potentiometer carry out vacuum epoxy resin respectively and pour
Note, and a phase resistance potentiometer, b phase resistance potentiometer and c phase resistance potentiometer are separately fixed at same metal ground plate
On.
4. a kind of electric resistance partial pressure type three-phase combination voltage transformer with residual voltage output according to claim 1 and 2,
It is characterized in that: when residual voltage accuracy of measurement requires better than 1 grade, a phase zero sequence resistance, b phase zero sequence resistance and c phase zero sequence
The resistance of resistance is equal, and does not adopt public zero sequence resistance.
5. a kind of electric resistance partial pressure type three-phase combination voltage transformer with residual voltage output according to claim 1 and 2,
It is characterized in that: when residual voltage accuracy of measurement requires less than or equal to 1 grade, a phase zero sequence resistance, b phase zero sequence resistance and c
The resistance of phase zero sequence resistance is infinity, now adopts public zero sequence resistance to export residual voltage proportional component.
6. a kind of electric resistance partial pressure type three-phase combination voltage transformer with residual voltage output according to claim 1 and 2,
It is characterized in that: the specified measurement output voltage values of a phase voltage, b phase voltage and c voltage areNominal load is 20m
ω, when there is Single Phase Metal ground connection, the specified measurement output voltage values of residual voltage are 6.5v, and nominal load is 20m ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620787853.9U CN205898869U (en) | 2016-07-25 | 2016-07-25 | Take zero sequence voltage output's resistive voltage divider formula three -phase combination voltage transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620787853.9U CN205898869U (en) | 2016-07-25 | 2016-07-25 | Take zero sequence voltage output's resistive voltage divider formula three -phase combination voltage transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205898869U true CN205898869U (en) | 2017-01-18 |
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| CN201620787853.9U Withdrawn - After Issue CN205898869U (en) | 2016-07-25 | 2016-07-25 | Take zero sequence voltage output's resistive voltage divider formula three -phase combination voltage transformer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106053909A (en) * | 2016-07-25 | 2016-10-26 | 浙江天际互感器有限公司 | Resistor divider type three-phase combined voltage transformer with zero sequence voltage output |
| CN106771469A (en) * | 2017-03-14 | 2017-05-31 | 江苏靖江互感器股份有限公司 | Controller switching equipment merges three-phase intelligent Current Voltage integration transformers with one or two times |
-
2016
- 2016-07-25 CN CN201620787853.9U patent/CN205898869U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106053909A (en) * | 2016-07-25 | 2016-10-26 | 浙江天际互感器有限公司 | Resistor divider type three-phase combined voltage transformer with zero sequence voltage output |
| CN106053909B (en) * | 2016-07-25 | 2019-08-27 | 浙江天际互感器有限公司 | Electric resistance partial pressure type three-phase combination voltage mutual inductor with residual voltage output |
| CN106771469A (en) * | 2017-03-14 | 2017-05-31 | 江苏靖江互感器股份有限公司 | Controller switching equipment merges three-phase intelligent Current Voltage integration transformers with one or two times |
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Inventor after: Xie Yue Inventor after: Zhu Shunfeng Inventor after: Tang Fuxin Inventor after: Mao Peimin Inventor before: Zhu Shunfeng Inventor before: Tang Fuxin Inventor before: Mao Peimin |
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Granted publication date: 20170118 Effective date of abandoning: 20190827 |
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| AV01 | Patent right actively abandoned |