CN106772197B - Calibration device for load box of mutual inductor - Google Patents
Calibration device for load box of mutual inductor Download PDFInfo
- Publication number
- CN106772197B CN106772197B CN201710007131.6A CN201710007131A CN106772197B CN 106772197 B CN106772197 B CN 106772197B CN 201710007131 A CN201710007131 A CN 201710007131A CN 106772197 B CN106772197 B CN 106772197B
- Authority
- CN
- China
- Prior art keywords
- mutual inductor
- load box
- sine wave
- amplifirer
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The invention discloses a kind of calibration device for load box of mutual inductor, including man-machine interaction device, data processor, sine wave signal generator, digital analog converter, the first amplifirer, isolating transformer, the second amplifirer, analog-digital converter and interface of tracing to the source.The present invention substitutes pressure regulator using data processor, standard sine wave producer and High-power amplifier device, solves the problems, such as to need manually-operated non intelligentization in the prior art, while improving fineness adjustment, reduces irregularity of wave form；Using simple and reliable amplifying circuit and high-resolution analog-digital converter, and then promote the accuracy of calibration device for load box of mutual inductor and stability well.
Description
Technical field
The present invention relates to transformer technical field, in particular to a kind of calibration device for load box of mutual inductor.
Background technique
Mutual inductor load box is the various payloads specially provided when examining electric current, voltage transformer, is full-automatic mutual
Sensor checking table and the ideal instrument of live transformer error test.
In the power system, electric energy meter and metering are related to all Electricity customers with mutual inductor and sell the public affairs of electric enterprise
Flat trade settlement, mutual inductor load box are the equipment for the simulation secondary load used during examining and determine metering mutual inductor,
Class of accuracy and the whether qualified result that will affect ct calibrating data of key technical index, it is therefore desirable to negative using mutual inductor
Lotus case calibrating installation is calibrated to calibrate mutual inductor load box and needs foundation JJF1264-2010 mutual inductor load box calibrating standard.
Most of calibration device for load box of mutual inductor is using the mode that manually or automatically pressure regulator mode flows up or boosts
It is calibrated, the degree of automation is not high.In addition, adjusting the way of output using pressure regulator, voltage, the current signal of output are electricity
Net waveform, generally there are biggish harmonic waves for network wave, and Burden box calibrating standard requires the signal harmonic tested when calibration to contain
Amount must not exceed 5%, can exceed that prescribed requirement；When adjusting 1% operating point of measurement current capacity case using pressure regulator,
It will appear the inadequate problem of fineness adjustment.
Summary of the invention
Goal of the invention of the invention is to provide a kind of calibration device for load box of mutual inductor, to solve existing mutual inductor load
The problem that case calibrating installation the degree of automation is not high and fineness adjustment is inadequate.
According to an embodiment of the invention, providing a kind of calibration device for load box of mutual inductor, comprising: man-machine interaction device, number
According to processor, sine wave signal generator, digital analog converter, the first amplifirer, isolating transformer, analog-digital converter, tracing to the source connects
Mouth and the second amplifirer；
The man-machine interaction device, the data processor, the digital analog converter, first amplifirer, the isolation
Transformer and mutual inductor load box are sequentially connected in series；Described sine wave signal generator one end is connect with the data processor, separately
One end is connect with the digital analog converter；Described analog-digital converter one end is connect with the data processor, the other end with it is described
The connection of second amplifirer；The interface of tracing to the source is connect with second amplifirer；The mutual inductor load box and second function
Put device connection；
The man-machine interaction device is used to send mutual inductor load box calibration command to the data processor；
The data processor is used to calculate the voltage letter for needing to export according to the mutual inductor load box calibration command
Number, obtain digital quantity signal；While digital quantity signal is sent to the digital analog converter, a clock signal is sent to institute
State sine wave signal generator；Calculate the voltage or electric current of the calibration device for load box of mutual inductor output, the mutual inductor
The phase between the phase or electric current and differential pressure between difference stream or differential pressure and voltage and difference stream that Burden box generates；Calculate institute
State admittance value or impedance value that mutual inductor load box is detected gear；Judging the gear range index of the mutual inductor load box is
It is no to meet required precision；
The sine wave signal generator is for exporting sine wave reference signal；
The digital analog converter is used to that the sine wave reference signal to be carried out ratio output according to the digital quantity signal,
Obtain sine wave AC signal；The sine wave AC signal is sent to first amplifirer；
First amplifirer is for amplifying the sine wave AC signal；
The isolating transformer is used to export test voltage or test electric current according to the sine wave AC signal to described
Mutual inductor load box；
Second amplifirer is for amplifying the test voltage or the test electric current and the mutual inductor load box
The difference stream or differential pressure signal of generation；
The analog-digital converter is used to detect the test voltage of output or tests electric current and mutual inductor load box production
Raw difference stream or differential pressure；
It is described trace to the source interface for connect trace to the source standard source.
It preferably, further include the computer being connect with the man-machine interaction device in the calibration device for load box of mutual inductor,
The computer issues the mutual inductor load box calibration command for controlling the man-machine interaction device.
Preferably, in the calibration device for load box of mutual inductor, the data processor is equipped with timer.
Preferably, in the calibration device for load box of mutual inductor, the digital analog converter is 16 digit mode converters.
Preferably, in the calibration device for load box of mutual inductor, the sine wave signal generator exports sine wave signal
Frequency be 40Hz-400Hz.
Preferably, in the calibration device for load box of mutual inductor, described device further includes shell, and the shell is 4U standard
Metal chassis.
Preferably, in the calibration device for load box of mutual inductor, the man-machine interaction device includes LCD screen and keyboard, institute
It states LCD screen and keyboard is set to the front of the shell.
Preferably, in the calibration device for load box of mutual inductor, the data processor is digital signal processor.
From the above technical scheme, the present invention provides a kind of calibration device for load box of mutual inductor, comprising: human-computer interaction
Device, data processor, sine wave signal generator, digital analog converter, the first amplifirer, isolating transformer, the second amplifirer, mould
Number converter and interface of tracing to the source；The man-machine interaction device, the data processor, the digital analog converter, first power amplifier
Device, the isolating transformer and mutual inductor load box are sequentially connected in series；At described sine wave signal generator one end and the data
Device connection is managed, the other end is connect with the digital analog converter；Described analog-digital converter one end is connect with the data processor, separately
One end is connect with second amplifirer；The interface of tracing to the source is connect with second amplifirer；The mutual inductor load box with
The second amplifirer connection.The present invention is adjusted using data processor, standard sine wave producer and High-power amplifier device substitution
Depressor solves the problems, such as to need manually-operated non intelligentization in the prior art, while improving fineness adjustment, reduces wave
Shape aberration rate；Using simple and reliable amplifying circuit and high-resolution analog-digital converter, and then make mutual inductor load box school
The accuracy of standard apparatus and stability are promoted well.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the structural block diagram that a kind of calibration device for load box of mutual inductor exemplified is preferably implemented according to one；
Fig. 2 is the working principle diagram that a kind of calibration device for load box of mutual inductor exemplified is preferably implemented according to one；
Fig. 3 is the impedance that exemplifies is preferably implemented according to one to trace to the source to verify wiring diagram；
Fig. 4 is the admittance that exemplifies is preferably implemented according to one to trace to the source to verify wiring diagram.
It illustrates:
Wherein, 1- computer, 2- man-machine interaction device, 3- data processor, 4- sine wave signal generator, 5- digital-to-analogue conversion
Device, the first amplifirer of 6-, 7- isolating transformer, 8- range switch, 9- analog-digital converter, 10- trace to the source interface, 11- mutual inductor
Burden box, the second amplifirer of 12-, 13- trace to the source standard source, 71- first resistor, 72- voltage transformer, 73- current transformer,
74- second resistance, the first relay of 81-, the second relay of 82-, 83- third relay, 101- first trace to the source interface, 102-
Two trace to the source interface, 111- current transformer load box, 112- voltage transformer transformation case, and 121- first amplifies buffer, 122-
Second amplification buffer, 123- third amplify buffer, and 124- the 4th amplifies buffer.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Whole description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Referring to Fig. 1, the embodiment of the invention provides a kind of calibration device for load box of mutual inductor, comprising: man-machine interaction device
2, data processor 3, sine wave signal generator 4, digital analog converter 5, the first amplifirer 6, isolating transformer 7, the second power amplifier
Device 12, analog-digital converter 9 and interface 10 of tracing to the source；
It is the man-machine interaction device 2, the data processor 3, the digital analog converter 5, first amplifirer 6, described
Isolating transformer 7 and mutual inductor load box 11 are sequentially connected in series；Described 4 one end of sine wave signal generator and the data processor
3 connections, the other end are connect with the digital analog converter 5；Described 9 one end of analog-digital converter is connect with the data processor 3, separately
One end is connect with second amplifirer 12；The interface 10 of tracing to the source is connect with second amplifirer 12；The mutual inductor is negative
Lotus case 11 is connect with second amplifirer 12.
The man-machine interaction device 2 is used to send mutual inductor load box calibration command to the data processor 3；
The data processor 3 is used to calculate the voltage for needing to export according to the mutual inductor load box calibration command
Signal obtains digital quantity signal；While digital quantity signal is sent to digital analog converter 5, a clock signal is sent
To the sine wave signal generator 4；The voltage or electric current of the calibration device for load box of mutual inductor output are calculated, it is described mutual
The phase between the phase or electric current and differential pressure between difference stream or differential pressure and voltage and difference stream that sensor Burden box 11 generates；
Calculate admittance value or impedance value that the mutual inductor load box 11 is detected gear；Judge the gear of the mutual inductor load box 11
Whether range index meets required precision；
The sine wave signal generator 4 is for exporting sine wave reference signal；
The digital analog converter 5 is used to that the sine wave reference signal to be carried out ratio according to the digital quantity signal defeated
Out, sine wave AC signal is obtained；The sine wave AC signal is sent to first amplifirer 6；
First amplifirer 6 is for amplifying the sine wave AC signal；
The isolating transformer 7 is used to export test voltage or test electric current according to the sine wave AC signal to described
Mutual inductor load box 11；
Second amplifirer 12 is for amplifying the test voltage or the test electric current and the mutual inductor load
The difference stream or differential pressure signal that case 11 generates；
The analog-digital converter 9 is used to detect the test voltage of output or tests electric current and the mutual inductor load box
The 11 difference streams generated or differential pressure；
It is described trace to the source interface 10 for connect trace to the source standard source 13.
The calibration device for load box of mutual inductor course of work provided in an embodiment of the present invention are as follows: data processor 3 is according to reception
Instruction progress program to man-machine interaction device 2 calculates the voltage signal for needing to export, and obtains digital analog converter digital quantity signal,
The characterization the output voltage of calibrating installation or the size of current amplitude.Data processor 3 is by digital analog converter digital quantity
While signal is sent to digital analog converter 5, a clock signal is sent to sine wave signal generator 4, sine wave signal hair
Raw device 4 needs to export the pure sine wave that voltage amplitude that a frequency is 50Hz, 60Hz or other frequencies is 7.07V according to calibration
AC signal, the sine wave AC signal are used as voltage or current reference to digital analog converter 5.Digital analog converter 5 is according to data
The sine wave reference signal that the digital analog converter digital quantity that processor 3 is sent sends sine wave signal generator 4 carries out
Ratio output, obtains the sine wave AC signal that voltage amplitude is controlled by data processor 3.The sine that digital analog converter 5 exports
Wave AC signal gives the first amplifirer 6, and the first amplifirer 6, which amplifies signal, to be pushed, and electricity is tested in output by isolating transformer 7
Pressure or test electric current give the mutual inductor load box 11 being calibrated.Second amplifirer 12 is electric by the test voltage or the test
The difference stream or differential pressure signal amplification that stream and the mutual inductor load box 11 generate are sent to analog-digital converter 9；Analog-digital converter
The difference stream or differential pressure that 9 pairs of test voltages amplified or test electric current and mutual inductor load box generate detect.Data processing
Device 3 calculates the voltage or electric current of device output by program, be calibrated Burden box generation difference stream or differential pressure and voltage with
Phase of the phase either between electric current and differential pressure between difference stream；It is tested that voltage transformer Burden box may further be calculated
The admittance value (including conductance and susceptance value) of gear is surveyed, or the resistance that current transformer load box is detected gear can be calculated
Anti- value (including resistance or reactance), whether the gear range index that further judgement is calibrated mutual inductor load box, which meets precision, is wanted
It asks.If gear range index meets required precision, continue the measurement of next range；If gear range index is unsatisfactory for
The basic parameter of measurement is then modified in required precision.
From the above technical scheme, the present invention provides a kind of calibration device for load box of mutual inductor, comprising: human-computer interaction
Device 2, data processor 3, sine wave signal generator 4, digital analog converter 5, the first amplifirer 6, isolating transformer 7, modulus turn
Parallel operation 9, trace to the source interface 10 and the second amplifirer 12；The man-machine interaction device 2, the data processor 3, the digital analog converter
5, first amplifirer 6, the isolating transformer 7 and mutual inductor load box 11 are sequentially connected in series；The sine wave signal occurs
4 one end of device is connect with the data processor 3, and the other end is connect with the digital analog converter 5；Described 9 one end of analog-digital converter
It is connect with the data processor 3, the other end is connect with second amplifirer 12；Interface 10 and second function of tracing to the source
Put the connection of device 12；The mutual inductor load box 11 is connect with second amplifirer 12.The present invention uses data processor, standard
Sine-wave generator and High-power amplifier device substitute pressure regulator, solve and need manually-operated non intelligentization in the prior art
Problem, while fineness adjustment is improved, reduce irregularity of wave form；Using simple and reliable amplifying circuit and high-resolution
Analog-to-digital conversion, and then promote the accuracy of calibration device for load box of mutual inductor and stability well.
Specifically, referring to Fig. 2, range switch 8 controls calibration voltage mutual inductor by controlling the switch of relay
Burden box 112 or current transformer load box 111, second amplifirer include the first amplification buffer 121, and the second amplification is slow
Device 122 is rushed, third amplifies buffer 123 and the 4th amplification buffer 124.
When the mutual inductor load box being calibrated is voltage transformer Burden box 112, range switch 8 controls the first relay
Device 81 and the closure of third relay 83, the second relay 82 disconnect；Device output voltage is depressured by voltage transformer 72, is passed through
First amplification buffer 121 is sent to the first passage measurement of analog-digital converter 9.It is negative that device output voltage is applied to voltage transformer
The electric current Δ i of generation on lotus case 112 is sent to the fourth lane measurement of analog-digital converter 9 by the 4th amplification buffer 124.Number
The voltage of device output and the difference stream of the generation of voltage transformer Burden box 112, Yi Ji electricity are calculated by program according to processor 3
Phase between pressure and difference stream；May further calculate voltage transformer Burden box 112 be detected gear admittance value (including
Conductance and susceptance value).
When the mutual inductor load box being calibrated is current transformer load box 111, range switch 8 controls the first relay
81 and second relay 82 closure, third relay 83 disconnect.Device exports electric current and passes through current transformer 73 and second resistance
74 samplings are measured by the second channel that the second amplification buffer 122 is sent to analog-digital converter 9.Device exports electric current in electric current
111 voltage Δ u amplifies the third channel measurement that buffer 123 is sent to analog-digital converter 9 by third on mutual inductor load box.
The differential pressure that data processor 3 calculates the electric current of device output by program and current transformer load box 111 generates, and
Phase between electric current and differential pressure；Impedance value (the packet that current transformer load box 111 is detected gear may further be calculated
Include resistance or reactance).
Specifically, Fig. 2 and Fig. 3 are please referred to, range switch 8 controls the first relay 81, the second relay 82 and third
Relay 83 all disconnects, To, Tx current measurement calibrated in interface 101 of tracing to the source using outside first of tracing to the source of impedance measurement function
Binding post and the second calibration of outside are traced to the source the Δ u differential pressure binding post in interface 102, and outside, which is traced to the source, calibrates electric current To, Tx and pass through electricity
74 sampling and measuring of current transformer 73 and second resistance is sent to the second channel of analog-digital converter 9 by the second amplification buffer 122
Measurement.Outside, which is traced to the source, calibrates the third channel measurement that differential pressure Δ u is sent to analog-digital converter 9 by third amplification buffer 123.Number
According to processor 3 by program calculate outside trace to the source calibrate electric current and outside trace to the source calibrate differential pressure and electric current and differential pressure it
Between phase；Impedance value may further be calculated, the result measured and corresponding standard signal carry out error analysis and obtain pair
The phase error answered, it is i.e. qualified that all obtained relative errors are not greater than ± 0.5%.Tracing to the source for impedance measurement function can be examined
Whether measuring the impedance detection of calibrating installation accurately, the accuracy of current transformer load box calibrating installation is improved.
Specifically, Fig. 2 and Fig. 4 are please referred to, range switch 8 controls the first relay 81, the second relay 82 and third
Relay 83 all disconnects, and a, x voltage measurement for using outside first to calibrate in interface 101 of tracing to the source of tracing to the source of admittance measurement function connect
Terminal and the second calibration of outside are traced to the source the Δ i difference stream binding post in interface 102, and trace to the source calibration voltage a, x of outside is mutual by voltage
Sensor 72 is depressured, and is measured by the first passage that the first amplification buffer 121 is sent to analog-digital converter 9.Outside is traced to the source calibration difference
Stream Δ i is sent to the fourth lane measurement of analog-digital converter 9 by the 4th amplification buffer 124.Data processor 3 passes through program meter
Calculate the external phase for tracing to the source calibration voltage and outside is traced to the source between calibration difference stream and voltage stream and difference stream；Further may be used
To calculate admittance value.The result measured carries out error analysis with corresponding standard signal and obtains corresponding phase error, owns
It is i.e. qualified that obtained relative error is not greater than ± 0.5%.Tracing to the source for admittance measurement function can detecte out leading for calibrating installation
Receive detection it is accurate whether, improve voltage transformer calibration device for load box accuracy.
Specifically, in the calibration device for load box of mutual inductor, the isolating transformer 7 have 1.6V, 25V, 70V and
Tetra- no-load voltage ratios of 122V can satisfy the current transformer load box calibration of specified 0.1A-5A, also can satisfy 33.3V-110V electricity
The calibration for pressing mutual inductor load box, expands the calibration range of current transformer load 111 and voltage transformer Burden box 112.
Specifically, in the calibration device for load box of mutual inductor, first amplification of the control of range switch 8 buffer
121, the second amplification buffer 122, third amplification buffer 123 and the 4th amplification buffer 124, automatic switching range.
It preferably, further include the computer being connect with the man-machine interaction device 2 in the calibration device for load box of mutual inductor
1.Outputting standard signal can be required according to the instruction of computer, realize automation verification mutual-inductor tester.
Preferably, in the calibration device for load box of mutual inductor, the data processor 3 is equipped with timer.Timer can
To send a clock signal to sine wave signal generator 4 every the identical time, the frequency of clock signal be the present invention just
1024 times of string wave frequency test signal.
Preferably, in the calibration device for load box of mutual inductor, the digital analog converter 5 is 16 digit mode converters.16
Digit mode converter control output test voltage, electric current, the resolution ratio of output signal is 1/65535, than about 300 circle of pressure regulator
Within adjusting resolution ratio be higher by 200 times or more, therefore calibrate the test between current transformer load box 1%~150%
Point can reach 0.1% accuracy.
Preferably, in the calibration device for load box of mutual inductor, the data processor 3 is sent out using digital isolator technology
Give sine wave signal generator 4 clock signal.The Primary Component that digital isolator uses is IOS7230, key technical index
Are as follows: isolation pressure resistance 4000V, 3 channels, digit rate 1Mbps.The digital isolator technology of use can be very good high speed light current
Digital circuit and powerful power amplifier electrical isolation, can play the role of interfering with each other, operational safety.
Preferably, in the calibration device for load box of mutual inductor, the sine wave signal generator 4 exports sine wave signal
Frequency be 40Hz-400Hz.Domestic mutual inductor load box at present can only calibrate the mutual-inductor tester of 50Hz substantially.The present invention
In the calibration device for load box of mutual inductor of offer, sine wave signal generator output sine wave signal can be common 50Hz,
Optional frequency within 60Hz or 40Hz-400Hz generates various using CPU timer internal tranmitting data register signal method
The sine wave signal of frequency, thus the frequency of output signal can achieve the resolution ratio and accuracy of 0.01Hz, realize any
The calibration function of frequency mutual inductor load box.
Preferably, in the calibration device for load box of mutual inductor, described device further includes shell, and the shell is 4U standard
Metal chassis.4U standard metal cabinet is horizontal type structure, and specification for structure is suitble to use in the test operation platform of laboratory, liquid
Brilliant and operation button panel is mounted on the front of 4U standard PC case, meets ergonomics.
Preferably, in the calibration device for load box of mutual inductor, the man-machine interaction device 2 includes LCD screen and keyboard,
The LCD screen and keyboard are set to the outer casing frontispiece.LCD screen can show test information, and tester can lead to
It crosses keyboard to be modified test information, so that tester is intuitively obtained test information and be quickly modified in time, convenient for surveying
Examination personnel operation.
Preferably, in the calibration device for load box of mutual inductor, the data processor 3 is digital signal processor.It is single
Piece can complete all controls and mathematical operation, reliable and stable.
Preferably, in the calibration device for load box of mutual inductor, first amplifirer 6 and the second amplifirer 12 are used
BTL (the Bridge-Tied- of OPA5124 power amplifier and triode array circuit SAP15P and SAP15N power tube design
Load, bridge-tied load) push-pull circuit.BTL push-pull circuit does not use the phase-shift circuit in the measuring circuit in conventional equipment,
The present invention is amplified to 0.5V- using the controllable amplifier of multiplying power after over sampling to test voltage, electric current, differential pressure or difference stream signal
Between 2V, then directly measured using 14 analog-digital converters, thus measuring circuit is simple, accuracy can achieve 0.1 grade.
Preferably, in the calibration device for load box of mutual inductor, the sine wave signal generator exports sinusoidal wave distortion
Rate is lower than 0.1%, significantly larger than calibrates the requirement of regulation.
Preferably, in the calibration device for load box of mutual inductor, the sine wave signal generator is using high stability
The 7.07V ac reference voltage stability of voltage reference, output reaches 0.05%, because of the test voltage or test of the invention output
Electric current will not change with the variation of network voltage.
Preferably, in the calibration device for load box of mutual inductor, the analog-digital converter 9 uses high-speed parallel and gradually forces
Nearly formula analog to digital conversion circuit, 14 chips MAX125, MAX125 using TI company are high integration, the synchronization of 4 х, 2 channel parallel
Sampling, 14bit Approach by inchmeal (SAR) type ADC, 9 high resolution of analog-digital converter may be implemented measured signal and accurately measure,
Calibration device for load box of mutual inductor accuracy is further promoted using software algorithm.
Preferably, in the calibration device for load box of mutual inductor, the man-machine interaction device 2 uses ARM framework, Peripheral Interface
Abundant, processing speed reaches 66MHz, facilitates the system-level cost for reducing application, sufficiently meets this system design requirement.
From the above technical scheme, the present invention provides a kind of calibration device for load box of mutual inductor, comprising: human-computer interaction
Device 2, data processor 3, sine wave signal generator 4, digital analog converter 5, the first amplifirer 6, isolating transformer 7, modulus turn
Parallel operation 9, trace to the source interface 10 and the second amplifirer 12；The man-machine interaction device 2, the data processor 3, the digital analog converter
5, first amplifirer 6, the isolating transformer 7 and mutual inductor load box 11 are sequentially connected in series；The sine wave signal occurs
4 one end of device is connect with the data processor 3, and the other end is connect with the digital analog converter 5；Described 9 one end of analog-digital converter
It is connect with the data processor 3, the other end is connect with second amplifirer 12；Interface 10 and second function of tracing to the source
Put the connection of device 12；The mutual inductor load box 11 is connect with second amplifirer 12.The present invention uses data processor, standard
Sine-wave generator and High-power amplifier device substitute pressure regulator, solve and need manually-operated non intelligentization in the prior art
Problem, while fineness adjustment is improved, reduce irregularity of wave form；Using simple and reliable amplifying circuit and high-resolution
Analog-digital converter, and then promote the accuracy of calibration device for load box of mutual inductor and stability well.
Those skilled in the art after considering the specification and implementing the invention disclosed here, will readily occur to of the invention its
Its embodiment.This application is intended to cover any variations, uses, or adaptations of the invention, these modifications, purposes or
Person's adaptive change follows general principle of the invention and including the undocumented common knowledge in the art of the present invention
Or conventional techniques.The description and examples are only to be considered as illustrative, and true scope and spirit of the invention are by following
Claim is pointed out.
It should be understood that the present invention is not limited to the precise structure already described above and shown in the accompanying drawings, and
And various modifications and changes may be made without departing from the scope thereof.The scope of the present invention is limited only by the attached claims.
Claims (8)
1. a kind of calibration device for load box of mutual inductor characterized by comprising man-machine interaction device (2), data processor (3), just
String wave generator (4), digital analog converter (5), the first amplifirer (6), isolating transformer (7), range switch (8), mould
Number converter (9), interface of tracing to the source (10) and the second amplifirer (12)；
The man-machine interaction device (2), the data processor (3), the digital analog converter (5), first amplifirer (6),
The isolating transformer (7) and mutual inductor load box (11) are sequentially connected in series；Described sine wave signal generator (4) one end with it is described
Data processor (3) connection, the other end are connect with the digital analog converter (5)；Described analog-digital converter (9) one end and the number
It is connected according to processor (3), the other end is connect with second amplifirer (12)；The interface of tracing to the source (10) and second power amplifier
Device (12) connection；The mutual inductor load box (11) connect with second amplifirer (12)；
The man-machine interaction device (2) is used to send mutual inductor load box calibration command to the data processor (3)；
The data processor (3) is used to calculate the voltage letter for needing to export according to the mutual inductor load box calibration command
Number, obtain digital quantity signal；While digital quantity signal is sent to the digital analog converter (5), a clock signal is sent
Give the sine wave signal generator (4)；The voltage or electric current of the calibration device for load box of mutual inductor output are calculated, it is described
Mutual inductor load box (11) generates between difference stream or differential pressure and the voltage and the difference stream phase or the electric current with
Phase between the differential pressure；Calculate admittance value or impedance value that the mutual inductor load box (11) are detected gear；Judge institute
Whether the gear range index for stating mutual inductor load box (11) meets required precision；
The sine wave signal generator (4) is for exporting sine wave reference signal；
The digital analog converter (5) is used to that the sine wave reference signal to be carried out ratio output according to the digital quantity signal,
Obtain sine wave AC signal；The sine wave AC signal is sent to first amplifirer (6)；
First amplifirer (6) is for amplifying the sine wave AC signal；
The isolating transformer (7) be used for according to the sine wave AC signal export test voltage or test electric current to it is described mutually
Sensor Burden box (11)；
Second amplifirer (12) is for amplifying the test voltage or the test electric current and the mutual inductor load box
(11) the difference stream or differential pressure signal generated；
The analog-digital converter (9) is used to detect the test voltage of output or tests electric current and the mutual inductor load box
(11) the difference stream or differential pressure generated；
The interface of tracing to the source (10) is for connecting standard source of tracing to the source；
Second amplifirer (12) includes the first amplification buffer (121), and the second amplification buffer (122), third is amplified slow
Rush device (123) and the 4th amplification buffer (124)；
First amplification buffer (121) of range switch (8) control, the second amplification buffer (122), third amplification buffering
Device (123) and the 4th amplification buffer (124), automatic switching range.
2. calibration device for load box of mutual inductor according to claim 1, which is characterized in that further include and the human-computer interaction
The computer (1) of device (2) connection, the computer (1) issue the mutual inductor load for controlling the man-machine interaction device (2)
Case calibration command.
3. calibration device for load box of mutual inductor according to claim 1, which is characterized in that the data processor (3) sets
There is timer.
4. calibration device for load box of mutual inductor according to claim 1, which is characterized in that the digital analog converter (5) is
16 digit mode converters.
5. calibration device for load box of mutual inductor according to claim 1, which is characterized in that the sine wave signal generator
(4) frequency for exporting sine wave signal is 40Hz-400Hz.
6. calibration device for load box of mutual inductor according to claim 1, which is characterized in that described device further includes shell,
The shell is 4U standard metal cabinet.
7. calibration device for load box of mutual inductor according to claim 6, which is characterized in that man-machine interaction device (2) packet
LCD screen and keyboard are included, the LCD screen and keyboard are set to the front of the shell.
8. calibration device for load box of mutual inductor according to claim 1, which is characterized in that the data processor (3) is
Digital signal processor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710007131.6A CN106772197B (en) | 2017-01-05 | 2017-01-05 | Calibration device for load box of mutual inductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710007131.6A CN106772197B (en) | 2017-01-05 | 2017-01-05 | Calibration device for load box of mutual inductor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106772197A CN106772197A (en) | 2017-05-31 |
| CN106772197B true CN106772197B (en) | 2019-11-01 |
Family
ID=58950264
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710007131.6A Active CN106772197B (en) | 2017-01-05 | 2017-01-05 | Calibration device for load box of mutual inductor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106772197B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107422290B (en) * | 2017-09-13 | 2023-11-10 | 云南电网有限责任公司电力科学研究院 | Device for controlling shift switching of transformer load box |
| CN108646210A (en) * | 2018-05-18 | 2018-10-12 | 云南电网有限责任公司电力科学研究院 | current transformer load box calibration point switching device |
| CN112230094B (en) * | 2020-11-11 | 2022-11-29 | 广东电网有限责任公司 | Teaching device for simulating power quality |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101625924A (en) * | 2009-05-14 | 2010-01-13 | 河南电力试验研究院 | Voltage transformer simulation load box |
| CN201532454U (en) * | 2009-07-28 | 2010-07-21 | 山西省电力公司电力科学研究院 | Integrated three-phase voltage load box |
| CN201867487U (en) * | 2010-11-30 | 2011-06-15 | 西北电网有限公司 | Multi-power-factor current transformer load box |
| CN102313878A (en) * | 2011-05-06 | 2012-01-11 | 国网电力科学研究院 | High-accuracy calibrating device for mutual inductor load box |
| CN202110271U (en) * | 2011-05-06 | 2012-01-11 | 国网电力科学研究院 | High-accuracy calibration device for load box of mutual inductor |
| CN202330557U (en) * | 2011-11-23 | 2012-07-11 | 浙江省电力试验研究院 | Automatic calibration device of mutual inductor load box |
| CN203490356U (en) * | 2013-07-08 | 2014-03-19 | 南京丹迪克科技开发有限公司 | Mutual inductor load box calibrating device with high precision and high reliability |
| CN104316893A (en) * | 2014-10-16 | 2015-01-28 | 内蒙古电力(集团)有限责任公司 | Full-automatic calibration method of transformer load box |
| CN104316892A (en) * | 2014-10-16 | 2015-01-28 | 内蒙古电力(集团)有限责任公司 | Transformer load box calibration device |
| CN204154889U (en) * | 2014-10-16 | 2015-02-11 | 内蒙古电力(集团)有限责任公司 | A kind of mutual inductor load box calibrating installation |
| CN105403851A (en) * | 2015-12-07 | 2016-03-16 | 无锡市计量检定测试中心 | Calibration method and apparatus of mutual inductor load box |
-
2017
- 2017-01-05 CN CN201710007131.6A patent/CN106772197B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101625924A (en) * | 2009-05-14 | 2010-01-13 | 河南电力试验研究院 | Voltage transformer simulation load box |
| CN201532454U (en) * | 2009-07-28 | 2010-07-21 | 山西省电力公司电力科学研究院 | Integrated three-phase voltage load box |
| CN201867487U (en) * | 2010-11-30 | 2011-06-15 | 西北电网有限公司 | Multi-power-factor current transformer load box |
| CN102313878A (en) * | 2011-05-06 | 2012-01-11 | 国网电力科学研究院 | High-accuracy calibrating device for mutual inductor load box |
| CN202110271U (en) * | 2011-05-06 | 2012-01-11 | 国网电力科学研究院 | High-accuracy calibration device for load box of mutual inductor |
| CN202330557U (en) * | 2011-11-23 | 2012-07-11 | 浙江省电力试验研究院 | Automatic calibration device of mutual inductor load box |
| CN203490356U (en) * | 2013-07-08 | 2014-03-19 | 南京丹迪克科技开发有限公司 | Mutual inductor load box calibrating device with high precision and high reliability |
| CN104316893A (en) * | 2014-10-16 | 2015-01-28 | 内蒙古电力(集团)有限责任公司 | Full-automatic calibration method of transformer load box |
| CN104316892A (en) * | 2014-10-16 | 2015-01-28 | 内蒙古电力(集团)有限责任公司 | Transformer load box calibration device |
| CN204154889U (en) * | 2014-10-16 | 2015-02-11 | 内蒙古电力(集团)有限责任公司 | A kind of mutual inductor load box calibrating installation |
| CN105403851A (en) * | 2015-12-07 | 2016-03-16 | 无锡市计量检定测试中心 | Calibration method and apparatus of mutual inductor load box |
Non-Patent Citations (4)
| Title |
|---|
| 互感器负荷箱智能校验系统设计;鲁继业;《电测与仪表》;20140610;第51卷(第11期);全文 * |
| 互感器负荷箱测试仪的校准方法探讨;陈威;《自动化与仪器仪表》;20130325(第2期);第137-138页 * |
| 互感器负荷箱测量仪校准装置的研制;张杰梁;《机电技术》;20140430(第2期);第54-56页 * |
| 基于Visual_Basic的互感器负荷箱测量仪校准系统的实现;张杰梁;《新技术与新仪器》;20150106;第35卷(第1期);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106772197A (en) | 2017-05-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101865986B (en) | System and method for checking error of high-voltage electric energy measurement device | |
| CN201444193U (en) | Comprehensive error detection device used for digital electric energy measuring device | |
| Crotti et al. | Frequency response of MV voltage transformer under actual waveforms | |
| CN201425621Y (en) | Error checking system of high-voltage electric energy metering device | |
| CN106772197B (en) | Calibration device for load box of mutual inductor | |
| CN101655544A (en) | Device for measuring and checking errors of digital mutual inductor | |
| CN103792508A (en) | Error test system and method for digitized metering device | |
| Crotti et al. | Frequency compliance of MV voltage sensors for smart grid application | |
| CN101807795A (en) | Method for forming electric energy metering simulation system and device thereof | |
| CN106054102B (en) | A kind of current transformer harmonic error measuring system | |
| Adamo et al. | A proposal for an open source energy meter | |
| CN106483489B (en) | Calibrating device of mutual-inductor check gauge based on detection feedback | |
| CN110045318A (en) | The device and method that assessment dynamic harmonic and temperature change influence electric energy meter error | |
| CN102981083A (en) | Self-calibration electric energy quality monitoring device | |
| CN107748348A (en) | The high-voltage electric energy meter calibrating installation that can integrally trace to the source | |
| Adamo et al. | Channel characterization of an open source energy meter | |
| CN201757779U (en) | Electronic transformer calibrator | |
| CN201540366U (en) | Three-phase harmonic standard calibration and verification device | |
| CN113253188A (en) | Digital power quality detection method and device | |
| CN207440274U (en) | The high-voltage electric energy meter calibrating installation that can integrally trace to the source | |
| CN2916652Y (en) | Electric power measuring cabinet testing device | |
| CN206311748U (en) | Calibration device for load box of mutual inductor | |
| CN110045311A (en) | Metering secondary global error on-the-spot test method and its system | |
| CN205920215U (en) | Current transformer harmonic error measurement system | |
| CN115047266A (en) | Direct current fills electric pile capability test device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |