CN207992282U - A kind of mutual-inductor tester calibrating installation standard source of high accuracy - Google Patents
A kind of mutual-inductor tester calibrating installation standard source of high accuracy Download PDFInfo
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- CN207992282U CN207992282U CN201820497621.9U CN201820497621U CN207992282U CN 207992282 U CN207992282 U CN 207992282U CN 201820497621 U CN201820497621 U CN 201820497621U CN 207992282 U CN207992282 U CN 207992282U
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Abstract
The utility model discloses a kind of mutual-inductor tester calibrating installation standard source of high accuracy, the standard source includes：FPGA, the first standard signal circuit, the second standard signal circuit；Wherein, the first standard signal circuit includes：Modulation circuit, the first AD circuits, the first modulate circuit, the second modulate circuit, the first accurate voltage mutual inductor, the first precision current transformer, first voltage turn current module；Second standard signal circuit includes：Amplitude modulation and phase modulation circuit, the 2nd AD circuits, third modulate circuit, the 4th modulate circuit, the second accurate voltage mutual inductor, the second precision current transformer, second voltage turn current module；It solves existing because tester calibrating installation does not have the measurement feedback of high accuracy and adjusting output, the problem that differential pressure signal occurring principle defect causes verification result error big, the high-precision for realizing mutual-inductor tester to examine and determine effect.
Description
Technical field
The utility model is related to calibrating installation fields, and in particular, to a kind of mutual-inductor tester calibrating of high accuracy
Device standard source.
Background technology
The country has a large amount of mutual-inductor tester for ct calibrating at present, is to ensure that mutual inductor magnitude is accurately important
Device.According to《Measurement Law detailed rules for the implementation》It is required that these mutual-inductor testers must implementation cycle calibrating.There is producer in the country at present
It is had the following problems when the mutual-inductor tester calibrating installation calibration operation of development：(1) the measurement feedback of not high precision is exported
With the design for adjusting output, debugging when by manufacture meets technical indicator, and stability when in use can not be examined, can only be in week
The stability of other methods ability checking device is examined and determine and used to phase.(2) differential pressure and difference of mesh mutual-inductor tester calibrating installation
Stream be by two paths of signals superposition output, wherein the phase of signal phase and standard signal U or I is consistent all the way,
It is called in-phase component signal, another way signal is by in-phase component signal by 90 generation orthogonal component signals of phase shifter phase shift.
Such differential pressure and difference stream signal generation model, when an amount very little in two signals of in-phase component or quadrature component, together
The sine value of angle between two signals of phase component and quadrature component is similar to the angle value of their angle, and traditional at this time is mutual
Sensor tester calibrating installation examines and determine traditional mutual-inductor tester and can obtain preferably examining and determine data.But work as in-phase component
When all big with two signals of quadrature component, the sine value of included angle between them and their angles just not approximately equal, angle
Angle is bigger, and difference is bigger and difference presentation is non-linear, and verification result error is larger.
Invention content
The utility model provides a kind of mutual-inductor tester calibrating installation standard source of high accuracy, solves existing
Because tester calibrating installation does not have the measurement of high accuracy to feed back and adjusts output, differential pressure signal occurring principle defect causes to examine and determine
The big problem of resultant error realizes the high-precision calibrating effect of mutual-inductor tester.
To realize above-mentioned purpose of utility model, this application provides a kind of mutual-inductor tester calibrating installations of high accuracy
Standard source, as shown in Figure 1.Standard source includes：
FPGA, the first standard signal circuit, the second standard signal circuit；Wherein, the first standard signal circuit includes：Amplitude modulation
Circuit, the first AD circuits, the first modulate circuit, the second modulate circuit, the first accurate voltage mutual inductor, the first precision current mutual inductance
Device, first voltage turn current module；Wherein, the input of FPGA outputs connection modulation circuit obtains the adjustable voltage letter of amplitude modulation
Number；The output of modulation circuit is respectively connected to the primary circuit of the first accurate voltage mutual inductor and first voltage turns the defeated of current module
Enter, the output outputting standard signal U1 of modulation circuit；First accurate voltage mutual inductor secondary circuit accesses the first modulate circuit
The signal of input, the output of the first modulate circuit meets the voltage range requirement of A/D, and the output of the first AD circuits accesses FPGA
I/O mouths；The output that first voltage turns current module accesses the first precision current transformer primary circuit, and the first precision current is mutual
The secondary circuit of sensor accesses the second modulate circuit, and the output signal of the second modulate circuit meets the voltage range requirement of A/D, the
One voltage turns the output outputting standard signal I1 of current module；Second standard signal circuit includes：Amplitude modulation and phase modulation circuit, the 2nd AD
Circuit, third modulate circuit, the 4th modulate circuit, the second accurate voltage mutual inductor, the second precision current transformer, second voltage
Turn current module；Wherein, the input of FPGA outputs connection amplitude modulation and phase modulation circuit, obtains the adjustable voltage signal of amplitude modulation；Amplitude modulation
The output of phase modulation circuit is respectively connected to the primary circuit of the second accurate voltage mutual inductor and second voltage turns the input of current module,
The output outputting standard signal U2 of amplitude modulation and phase modulation circuit；Second accurate voltage mutual inductor secondary circuit accesses third modulate circuit
The signal of input, the output of third modulate circuit meets the voltage range requirement of A/D, and the output of the 2nd AD circuits accesses FPGA
I/O mouths；Second voltage turns the output access third precision current transformer primary circuit of current module, and third precision current is mutual
The secondary circuit of sensor accesses the 4th modulate circuit, and the output signal of the 4th modulate circuit meets the voltage range requirement of A/D, the
Two voltages turn the output outputting standard signal I2 of current module.
The application is that the function of the application, the application are realized using existing program in existing module and these modules
What is protected is the composition and its connection relation of device.
The model of FPGA module：The EP2C5 of ALTERA companies；FPGA module generates frequency, amplitude, phase-adjustable respectively
7 road waveforms, wherein three tunnels, for generating the adjustable first via standard signal of amplitude, remaining four tunnel can for generating amplitude phase
The second standard signal adjusted.
Amplitude modulation and phase modulation circuit includes：Modulation circuit and amplitude modulation and phase modulation circuit；Modulation circuit includes：16 D/A converters and mould
Quasi- adder, wherein the D/A converter model in modulation circuit：DAC8531；Analog adder forms realization simulation by amplifier
Signal mutually sums it up enlarging function；I/O mouthfuls of FPGA exports two ways of digital signals to two 16 D/A, and D/A outputs are rear class two
D/A provides DC reference, and I/O mouthfuls of another aspect FPGA exports the input terminal that cosine signal all the way accesses two D/A, two D/A
The analog quantity of output accesses analog adder, and analog adder exports first via standard signal；
Amplitude modulation and phase modulation circuit includes 24 D/A converters and analog adder, the wherein D/A converter in amplitude modulation and phase modulation circuit
Model：DAC1220；I/O mouthfuls of FPGA exports two ways of digital signals to two 16 D/A, and D/A outputs are two rear classes 24
D/A provides DC reference, and I/O mouthfuls of another aspect FPGA exports cosine signal all the way and sinusoidal signal accesses two D/A all the way
Input terminal, the analog quantity of two D/A output accesses analog adder, and analog adder exports the second road sign calibration signal.
Measuring feedback circuit includes：Accurate voltage mutual inductor, precision current transformer and modulate circuit；Accurate voltage mutual inductance
Device chooses 0.005 grade of mutual inductor, completes conversion and isolation to voltage signal；Precision current transformer is selected as 0.005 grade
Current transformer completes conversion and isolation to current signal；Modulate circuit is made of power amplifier, it is therefore an objective to believe voltage, electric current
Number conditioning at the level signal range for meeting A/D sampling requests.
The present apparatus turns current module by FPGA, modulation circuit and voltage and generates the first standard signal (U1 and I1).
All the way on the basis of standard signal, according to the setting value that the ratio difference and angular difference of setting export, the second standard letter is obtained by calculation
Included angle number between (U2 and I2) and the first standard signal (U1 and I1), calculates the width of sinusoidal component and cosine component
Value, then current module is turned by FPGA, amplitude modulation and phase modulation position circuit and voltage and generates the second standard signal (U2 and I2).It is mutual in calibrating
When sensor tester, the first standard signal accesses mutual-inductor tester standard loop, the first standard signal and the second road sign definite message or answer
It number connects to form difference access mutual-inductor tester difference circuit by external electrical, subsequently completes mutual-inductor tester calibrating.
The amplitude and phase of U1, I1, U2 and I2 are generated by independent Waveform of Numeral Compounding, and accuracy is high, and overall accuracy reaches 0.05
Grade, solve angular difference it is larger when nonlinearity erron and adjust frequency influence output accuracy problems.
The present apparatus uses measurement feedback technique simultaneously, and to the signal real-time sampling of output, FPGA utilizes Fourier techniques
Calculate the ratio difference and angular difference value of reality output, feedback data adjusts output to microprocessor, dial gauge measurement result be used for into
Adjustment of the row to operation source amplitude adjusts resolution ratio and is better than 10-7.It is used for carrying out the second standard signal than difference and the result of angular difference
The adjustment of amplitude and phase, amplitude adjust resolution ratio and are better than 10-7, phase adjusted resolution ratio is better than 0.0001 point.First standard is believed
Number the amplitude accuracy of output be better than 0.02%, the amplitude accuracy of the output of the second standard signal is better than 0.02% and phase
Accuracy is better than 0.05 point.Ensure 0.1% accuracy of overall output.
The utility model proposes device realize the signal of high accuracy a kind of function occur.Pass through FPGA, amplitude modulation
Circuit and voltage turn current module and generate the first standard signal (U1 and I1).On the basis of first via standard signal, according to setting
The setting value of fixed ratio difference and angular difference output, is obtained by calculation the second standard signal (U2 and I2) and the first standard signal (U1
And I1) between included angle, calculate the amplitude of sinusoidal component and cosine component, then pass through FPGA, amplitude modulation and phase modulation position circuit
And voltage turns current module and generates the second standard signal (U2 and I2).When examining and determine mutual-inductor tester, the first standard signal connects
Enter mutual-inductor tester standard loop, the first standard signal and the second road sign calibration signal are connected by external electrical to be formed difference and connect
Enter mutual-inductor tester difference circuit, subsequently completes mutual-inductor tester calibrating.The amplitude and phase of U1, I1, U2 and I2 are by only
Vertical Waveform of Numeral Compounding generates, and accuracy is high, and overall accuracy reaches 0.05 grade, solve angular difference it is larger when non-linear mistake
Difference and adjusting frequency influence export accuracy problems.The principle of second standard signal is as follows：
Assuming that signal mathematic(al) representation is：
U2=Um2cos(ωt+θ) (1)
It is obtained after trigonometric function expansion：
U2=Um2cosωt cosθ-Um2sinωt sinθ (2)
A=cos θ B=-sin θ are enabled, formula (2) is brought into and obtains：
U2=AUm2cosωt+BUm2sinωt (3)
Initial phase is：
θ=π-arctg (B/A) (4)
A and B meets following relationship
A2+B2=1 (5)
Therefore, the adjustable signal U2 of high-precision phase position is obtained by accurately adjusting A and B values.
Modulation circuit is as shown in Figure 2.Modulation circuit has 16 D/A converters and analog adder, wherein D/A converter model
For：DAC8531.Analog adder is made of amplifier realizes that analog signal is added function.Amplitude modulation and phase modulation circuit is as shown in figure 3, packet
Include 24 D/A converters and analog adder, wherein D/A converter model：DAC1220.Analog adder is made of real amplifier
Existing analog signal is added function.
The utility model proposes device realize high-acruracy survey feedback, it is accurate to the signal real-time sampling of output
Voltage transformer chooses 0.005 grade of mutual inductor, completes conversion and isolation to voltage signal.Precision current transformer is selected as
0.005 grade of current transformer completes conversion and isolation to current signal.Modulate circuit by power amplifier form purpose be will be electric
Pressure, current signal conditioning are at the level signal range for meeting A/D sampling requests.After signal sampling to FPGA, Fourier skill is utilized
Art calculates the ratio difference and angular difference value of reality output, and feedback data adjusts output to microprocessor, and dial gauge measurement result is used for
The adjustment to the first standard signal amplitude is carried out, resolution ratio is adjusted and is better than 10-7.It is used for the second standard than difference and the result of angular difference
Signal carries out the adjustment of amplitude and phase, and amplitude adjusts resolution ratio and is better than 10-7, phase adjusted resolution ratio is better than 0.0001 point.The
The amplitude accuracy of the output of one standard signal is better than 0.02%, and the amplitude accuracy of the output of the second standard signal is better than
0.02% and phase accuracy be better than 0.05 point, ensure 0.05% accuracy of overall output.
Compared with prior art, the beneficial effects of the utility model are：
1. using the generation model and FPGA technology of new differential pressure and difference stream, designs two-way amplitude and phase precision is adjustable
Digital program controlled signal source, solves current device and generates orthogonal component signal by 90 ° of phase shifters, is generated when angular difference is larger additional
Error and nonlinear problem.
2. using high-resolution phase regulation technology and automatic measurement feedback compensation technique, solves the stabilization of device output
Property, accuracy, object adaptability problem, amplitude adjust resolution ratio be better than 10-7, phase adjusted resolution ratio be better than 0.0001 point, work
The amplitude accuracy for making the output in source is better than 0.02%, and the amplitude accuracy of the output in difference source is better than 0.02% and phase is accurate
Degree is better than 0.05 point, ensures 0.05% accuracy of overall output, reaches domestic highest level.
Description of the drawings
Attached drawing described herein is used for providing further understanding the embodiment of the present invention, constitutes one of the application
Point, do not constitute the restriction to the embodiment of the present invention；
The composition schematic diagram of the mutual-inductor tester calibrating installation standard source of Fig. 1 high accuracies；
The composition schematic diagram of Fig. 2 modulation circuits；
The composition schematic diagram of Fig. 3 amplitude modulation and phase modulation circuits.
Specific implementation mode
The utility model provides a kind of mutual-inductor tester calibrating installation standard source of high accuracy, solves existing
Because tester calibrating installation does not have the measurement of high accuracy to feed back and adjusts output, differential pressure signal occurring principle defect causes to examine and determine
The big problem of resultant error realizes the high-precision calibrating effect of mutual-inductor tester.
To better understand the objects, features and advantages of the present invention, below in conjunction with the accompanying drawings and specific real
Mode is applied the present invention is further described in detail.It should be noted that in the case where not conflicting mutually, the application's
Feature in embodiment and embodiment can be combined with each other.
Many details are elaborated in the following description to facilitate a thorough understanding of the present invention, still, the present invention may be used also
Implemented with being different from the other modes being described herein in range using other, therefore, protection scope of the present invention is not by under
The limitation of specific embodiment disclosed in face.
Referring to FIG. 1, this application provides a kind of mutual-inductor tester calibrating installation standard source of high accuracy, the mark
Quasi- source includes：
FPGA, the first standard signal circuit, the second standard signal circuit；Wherein, the first standard signal circuit includes：Amplitude modulation
Circuit, the first AD circuits, the first modulate circuit, the second modulate circuit, the first accurate voltage mutual inductor, the first precision current mutual inductance
Device, first voltage turn current module；Wherein, the input of FPGA outputs connection modulation circuit obtains the adjustable voltage letter of amplitude modulation
Number；The output of modulation circuit is respectively connected to the primary circuit of the first accurate voltage mutual inductor and first voltage turns the defeated of current module
Enter, the output outputting standard signal U1 of modulation circuit；First accurate voltage mutual inductor secondary circuit accesses the first modulate circuit
The signal of input, the output of the first modulate circuit meets the voltage range requirement of A/D, and the output of the first AD circuits accesses FPGA
I/O mouths；The output that first voltage turns current module accesses the first precision current transformer primary circuit, and the first precision current is mutual
The secondary circuit of sensor accesses the second modulate circuit, and the output signal of the second modulate circuit meets the voltage range requirement of A/D, the
One voltage turns the output outputting standard signal I1 of current module；Second standard signal circuit includes：Amplitude modulation and phase modulation circuit, the 2nd AD
Circuit, third modulate circuit, the 4th modulate circuit, the second accurate voltage mutual inductor, the second precision current transformer, second voltage
Turn current module；Wherein, the input of FPGA outputs connection amplitude modulation and phase modulation circuit, obtains the adjustable voltage signal of amplitude modulation；Amplitude modulation
The output of phase modulation circuit is respectively connected to the primary circuit of the second accurate voltage mutual inductor and second voltage turns the input of current module,
The output outputting standard signal U2 of amplitude modulation and phase modulation circuit；Second accurate voltage mutual inductor secondary circuit accesses third modulate circuit
The signal of input, the output of third modulate circuit meets the voltage range requirement of A/D, and the output of the 2nd AD circuits accesses FPGA
I/O mouths；Second voltage turns the output access third precision current transformer primary circuit of current module, and third precision current is mutual
The secondary circuit of sensor accesses the 4th modulate circuit, and the output signal of the 4th modulate circuit meets the voltage range requirement of A/D, the
Two voltages turn the output outputting standard signal I2 of current module.
Wherein, in the embodiment of the present application, the model of FPGA module：The EP2C5 of ALTERA companies；FPGA module is distinguished
7 road waveforms of frequency, amplitude, phase-adjustable are generated, wherein three tunnels are used to generate the adjustable first via standard signal of amplitude, remaining
Four tunnels are for generating adjustable second standard signal of amplitude phase.
Wherein, in the embodiment of the present application, amplitude modulation and phase modulation circuit includes：Modulation circuit and amplitude modulation and phase modulation circuit；Amplitude modulation electricity
Road includes：16 D/A converters and analog adder, wherein the D/A converter model in modulation circuit：DAC8531；Simulation
Adder is made of amplifier realizes that analog signal mutually sums it up enlarging function；I/O mouthfuls of FPGA exports two ways of digital signals to two 16
Position D/A, D/A output provides DC reference for two D/A of rear class, and cosine signal accesses I/O mouthfuls of outputs of another aspect FPGA all the way
The analog quantity of the input terminal of two D/A, two D/A outputs accesses analog adder, and analog adder exports first via standard letter
Number；
Amplitude modulation and phase modulation circuit includes 24 D/A converters and analog adder, the wherein D/A converter in amplitude modulation and phase modulation circuit
Model：DAC1220；I/O mouthfuls of FPGA exports two ways of digital signals to two 16 D/A, and D/A outputs are two rear classes 24
D/A provides DC reference, the output of FPGAI/O mouthful of another aspect cosine signal and two D/A of sinusoidal signal access all the way all the way
The analog quantity of input terminal, two D/A outputs accesses analog adder, and analog adder exports the second road sign calibration signal.
Wherein, in the embodiment of the present application, the first and second accurate voltage mutual inductors choose 0.005 grade of mutual inductor, complete
The conversion and isolation of pairs of voltage signal；First and second precision current transformers are selected as 0.005 grade of current transformer, complete
Conversion and isolation to current signal；First to fourth modulate circuit is made of power amplifier, by voltage, current signal conditioning at satisfaction
The level signal range of A/D sampling requests.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
God and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (4)
1. a kind of mutual-inductor tester calibrating installation standard source of high accuracy, which is characterized in that the standard source includes：
FPGA, the first standard signal circuit, the second standard signal circuit；Wherein, the first standard signal circuit includes：Amplitude modulation electricity
Road, the first AD circuits, the first modulate circuit, the second modulate circuit, the first accurate voltage mutual inductor, the first precision current mutual inductance
Device, first voltage turn current module；Wherein, the input of FPGA outputs connection modulation circuit obtains the adjustable voltage letter of amplitude modulation
Number；The output of modulation circuit is respectively connected to the primary circuit of the first accurate voltage mutual inductor and first voltage turns the defeated of current module
Enter, the output outputting standard signal U1 of modulation circuit；First accurate voltage mutual inductor secondary circuit accesses the first modulate circuit
The signal of input, the output of the first modulate circuit meets the voltage range requirement of A/D, the output access FPGA's of the first AD circuits
I/O mouthfuls；The output that first voltage turns current module accesses the first precision current transformer primary circuit, the first precision current mutual inductance
The secondary circuit of device accesses the second modulate circuit, and the output signal of the second modulate circuit meets the voltage range requirement of A/D, and first
Voltage turns the output outputting standard signal I1 of current module；Second standard signal circuit includes：Amplitude modulation and phase modulation circuit, the 2nd AD electricity
Road, third modulate circuit, the 4th modulate circuit, the second accurate voltage mutual inductor, the second precision current transformer, second voltage turn
Current module；Wherein, the input of FPGA outputs connection amplitude modulation and phase modulation circuit, obtains the adjustable voltage signal of amplitude modulation；Amplitude modulation tune
The output of circuitry phase is respectively connected to the primary circuit of the second accurate voltage mutual inductor and second voltage turns the input of current module, adjusts
The output outputting standard signal U2 of width phase modulation circuit；Second accurate voltage mutual inductor secondary circuit accesses the defeated of third modulate circuit
Enter, the signal of the output of third modulate circuit meets the voltage range requirement of A/D, the I/ of the output access FPGA of the 2nd AD circuits
O mouthfuls；Second voltage turns the output access third precision current transformer primary circuit of current module, third precision current transformer
Secondary circuit access the 4th modulate circuit, the output signal of the 4th modulate circuit meets the voltage range requirement of A/D, the second electricity
Pressure turns the output outputting standard signal I2 of current module.
2. the mutual-inductor tester calibrating installation standard source of high accuracy according to claim 1, which is characterized in that FPGA
The model of module：The EP2C5 of ALTERA companies；FPGA module generates 7 road waveforms of frequency, amplitude, phase-adjustable respectively,
In three tunnels for generating the adjustable first via standard signal of amplitude, remaining four tunnel is for generating adjustable second standard of amplitude phase
Signal.
3. the mutual-inductor tester calibrating installation standard source of high accuracy according to claim 1, which is characterized in that amplitude modulation
Phase modulation circuit includes：Modulation circuit and amplitude modulation and phase modulation circuit；Modulation circuit includes：16 D/A converters and analog adder,
In, the D/A converter model in modulation circuit：DAC8531；Analog adder is made of amplifier realizes that analog signal mutually sums it up
Enlarging function；I/O mouthfuls of FPGA exports two ways of digital signals to two 16 D/A, and D/A outputs provide direct current for two D/A of rear class
With reference to I/O mouthfuls of another aspect FPGA exports the input terminal that cosine signal all the way accesses two D/A, the simulation of two D/A outputs
Amount access analog adder, analog adder export first via standard signal；
Amplitude modulation and phase modulation circuit includes 24 D/A converters and analog adder, wherein the D/A converter model in amplitude modulation and phase modulation circuit
For：DAC1220；I/O mouthfuls of FPGA exports two ways of digital signals to two 16 D/A, and D/A outputs are that two rear classes, 24 D/A are carried
For DC reference, I/O mouthfuls of outputs of another aspect FPGA cosine signal and input of two D/A of sinusoidal signal access all the way all the way
The analog quantity at end, two D/A outputs accesses analog adder, and analog adder exports the second road sign calibration signal.
4. the mutual-inductor tester calibrating installation standard source of high accuracy according to claim 1, which is characterized in that first
0.005 grade of mutual inductor is chosen with the second accurate voltage mutual inductor, completes conversion and isolation to voltage signal；First and second
Precision current transformer is selected as 0.005 grade of current transformer, completes conversion and isolation to current signal；First to fourth adjusts
Reason circuit is made of power amplifier, by voltage, current signal conditioning at the level signal range for meeting A/D sampling requests.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109507459A (en) * | 2018-11-27 | 2019-03-22 | 国网江苏省电力有限公司电力科学研究院 | Standard electric signal creating method, device and accuracy checking method of one or two fusion switchgears and system |
| CN110297206A (en) * | 2019-06-06 | 2019-10-01 | 国网浙江省电力有限公司电力科学研究院 | Equipment for three-phase electrical energy meter power source based on IR46 standard |
| CN116577536A (en) * | 2023-07-10 | 2023-08-11 | 烟台东方威思顿电气有限公司 | Three-phase alternating current standard source based on waveform-amplitude separation control |
| CN117310240A (en) * | 2023-11-30 | 2023-12-29 | 国网山西省电力公司营销服务中心 | Signal source generation system and method for calibrating device of transformer calibrator |
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2018
- 2018-04-09 CN CN201820497621.9U patent/CN207992282U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109507459A (en) * | 2018-11-27 | 2019-03-22 | 国网江苏省电力有限公司电力科学研究院 | Standard electric signal creating method, device and accuracy checking method of one or two fusion switchgears and system |
| CN110297206A (en) * | 2019-06-06 | 2019-10-01 | 国网浙江省电力有限公司电力科学研究院 | Equipment for three-phase electrical energy meter power source based on IR46 standard |
| CN110297206B (en) * | 2019-06-06 | 2021-06-25 | 国网浙江省电力有限公司营销服务中心 | Three-phase electric energy meter calibrating device power source based on IR46 standard |
| CN116577536A (en) * | 2023-07-10 | 2023-08-11 | 烟台东方威思顿电气有限公司 | Three-phase alternating current standard source based on waveform-amplitude separation control |
| CN116577536B (en) * | 2023-07-10 | 2023-09-15 | 烟台东方威思顿电气有限公司 | Three-phase alternating current standard source based on waveform-amplitude separation control |
| CN117310240A (en) * | 2023-11-30 | 2023-12-29 | 国网山西省电力公司营销服务中心 | Signal source generation system and method for calibrating device of transformer calibrator |
| CN117310240B (en) * | 2023-11-30 | 2024-02-09 | 国网山西省电力公司营销服务中心 | Signal source generation system and method for calibrating device of transformer calibrator |
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