CN201583642U - Calibration apparatus and system of digital electric energy meter - Google Patents
Calibration apparatus and system of digital electric energy meter Download PDFInfo
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- CN201583642U CN201583642U CN2009202781927U CN200920278192U CN201583642U CN 201583642 U CN201583642 U CN 201583642U CN 2009202781927 U CN2009202781927 U CN 2009202781927U CN 200920278192 U CN200920278192 U CN 200920278192U CN 201583642 U CN201583642 U CN 201583642U
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Abstract
The utility model discloses a calibration apparatus and system of digital electric energy meter. The calibration apparatus includes a digital signal generating unit, a digital signal transferring unit, a calibration standard generating unit, a calibration result generating unit and at least one calibration interface; the digital signal generating unit is connected with the calibration standard generating unit and the calibration interface through the digital signal transferring unit; the calibration result generating unit is respectively connected with the calibration standard generating unit and the calibration interface; the digital signal transferring unit transfers a test digital signal to the calibration standard generating unit and the calibration interface; the calibration standard generating unit receives the test digital signal to generate test standard data; the calibration interface receives the test digital signal and transmits the test digital signal to a tested digital electric energy meter to lead the digital electric energy meter to generate test data; and the calibration result generating unit generates the calibration result according to the test standard data and the test data.
Description
Technical field
The utility model relates in particular to a kind of digitalized electrical energy meter calibration equipment and system about the measuring technique of digital multifunctional electric energy meter in the electric system.
Background technology
At present, digitalized electrical energy meter is at the digital transformer substation hanging net operation, and this digitalized electrical energy meter is to follow IEC61850-9-1 communication of digitalization transformer substation stipulations, has the digital signal input interface, is applied to the electric energy meter of digital transformer substation.
Because the input port of digitalized electrical energy meter is a digital interface, and traditional simulation calibration equipment can not provide the digit check signal, therefore can't be used for the verification of digitalized electrical energy meter.
The utility model content
The purpose of this utility model is to provide a kind of calibration equipment that is used for the digitalized electrical energy meter verification, make the digitalized electrical energy meter of following the IEC61850 standard can access verification, this device comprises: the digital signal generating unit, digital signal is divided changes the unit, the test stone generation unit, assay generation unit and at least one check interface; The digital signal generating unit divides the commentaries on classics unit to be connected with the verification interface with verification standard generation unit by digital signal, and the check results generation unit is connected with the verification interface with verification standard generation unit respectively; Wherein, the digital signal generating unit generates test of digital signal according to electric power system model, and test of digital signal is sent to digital signal branch commentaries on classics unit; Digital signal divides the commentaries on classics unit to forward the test of digital signal branch to verification standard generation unit and verification interface; Test stone generation unit received signal is divided changes the test of digital signal that the unit is sent, and generates the testing standard data; Verification interface received signal is divided changes the test of digital signal that the unit is sent, and test of digital signal is transferred to the measured number electric energy meter and gathers the test data that the measured number electric energy meter generates; The check results generation unit generates check results according to testing standard data and test data.
Simultaneously, this use is novel also to disclose a kind of check system that is used for the digitalized electrical energy meter verification, comprise: digitalized electrical energy meter calibration equipment and digitalized electrical energy meter, wherein, the digitalized electrical energy meter calibration equipment comprises: the digital signal generating unit, digital signal is divided changes the unit, test stone generation unit, assay generation unit and at least one check interface; The digital signal generating unit divides the commentaries on classics unit to be connected with the verification interface with verification standard generation unit by digital signal, and the check results generation unit is connected with the verification interface with verification standard generation unit respectively; Wherein, the digital signal generating unit generates test of digital signal according to electric power system model, and test of digital signal is sent to digital signal branch commentaries on classics unit; Digital signal divides the commentaries on classics unit to forward the test of digital signal branch to verification standard generation unit and verification interface; The test stone generation unit receives described signal and divides the commentaries on classics test of digital signal that the unit is sent, and generates the testing standard data; The verification interface receives described signal and divides the commentaries on classics test of digital signal that the unit is sent, and test of digital signal is transferred to the measured number electric energy meter and gathers the test data that the measured number electric energy meter generates; The check results generation unit generates check results according to testing standard data and test data.
Can realize digital quantity input electric energy meter is carried out verification by the utility model, thereby solve the problem that digital quantity input electric energy meter can't verification.
Description of drawings
Fig. 1 is the structural representation of digital quantity electric energy meter checking device;
Fig. 2 carries out verification for digital quantity electrical energy meter calibration system to tested table synoptic diagram;
Fig. 3 is the structural representation of digital signal generating means among the embodiment;
Fig. 4 is provided with the structural representation of unit for the signal parameter of digital signal generating means;
Fig. 5 is provided with the structural representation of unit for the frame format of digital signal generating means;
Fig. 6 carries out verification for the utility model to tested electric energy meter flow process;
Fig. 7 is the utility model digital quantity electrical energy meter calibration system architecture synoptic diagram;
Fig. 8 is the synoptic diagram of the utility model digital quantity electric energy meter checking device.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer,, the technical scheme among the utility model embodiment is clearly and completely described below in conjunction with the accompanying drawing among the utility model embodiment.At this, the illustrative examples of present embodiment and explanation thereof are used to explain present embodiment, but not as to qualification of the present utility model.
A kind of digital quantity electric energy meter checking device as shown in Figure 1, is the synoptic diagram of a kind of digital quantity electric energy meter checking device of the utility model.Wherein 10 is the utility model digital quantity electrical energy meter calibration system.Comprise digital signal generating unit 101, digital signal is divided changes unit 102, verification standard generation unit 103, check results generation unit 104 and verification interface 105.
Digital signal generating unit 101 divides commentaries on classics unit 102 to be connected with verification interface 104 with verification standard generation unit 103 by digital signal, and check results generation unit 104 is connected with the verification interface with verification standard generation unit 103 respectively; Digital signal generating unit 101 generates test of digital signal according to electric power system model, and test of digital signal is sent to digital signal branch commentaries on classics unit 102; Digital signal divides commentaries on classics unit 102 to forward the test of digital signal branch to verification standard generation unit 103 and verification interface 105; Test stone generation unit 103 received signals are divided changes the test of digital signal that unit 102 is sent, and generates the testing standard data; Verification interface 105 received signals are divided changes the test of digital signal that unit 102 is sent, and test of digital signal is transferred to the measured number electric energy meter and gathers the test data that described measured number electric energy meter generates; Check results generation unit 104 generates check results according to testing standard data and test data.
Have at least one verification interface in the utility model, can expand the number of verification interface according to the quantity or the actual conditions of tested table.
Digital electric energy meter checking device of the present utility model also comprises main control computer, be used for digital signal generation apparatus is carried out the parameter setting, can be by different parametric variables be set, simulate different operation of power networks situations, and the frequency of the high frequency power pulse of output that can the control figure standard scale, receive the result of calculation that Error Calculation equipment generates; Also comprise the output pulses collecting unit, be used to gather the test data that the measured number electric energy meter generates, and, realize the data transmission that tested table and signal divide to be changeed between unit and the check results generation unit by electrooptic switching element.。
As shown in Figure 2, the synoptic diagram for adopting the utility model digital electric energy meter checking device tested table to be carried out verification.In the present embodiment, 200 is the utility model digital quantity electric energy meter checking device, comprise, main control computer 201, digital signal generating means 202 (being digital signal generating unit 101), the network switch 203 (being that digital signal is divided commentaries on classics unit 102), standard scale 204 (and verification standard generation unit 103), Error Calculator 205 (being check results generation unit 104) and electro-optic device 206 (being verification interface 105).The network switch 203 is used to receive and transmit the Frame (be signal and divide rotary device 102) of digital signal generating means 202 outputs.Simultaneously, the digital electric energy meter checking device in the utility model also comprises power module, is used to this device that stable working power is provided.
Digital signal generating means 202 generates the digit check signal, and in the present embodiment, what the master chip of digital signal generating means 202 adopted is the digital signal processor with network MAC layer equipment and asynchronous serial communication mouth.Wherein its MAC layer equipment is by connecting the network channel of outside physical chip composition data output, and its UART port is used for communicating by letter with assisting MCU.The checking signal that is generated by the digital signal generating means in the present embodiment has been followed the IEC61850-9-1 consensus standard, and the concrete form of Frame can be according to the requirement configuration that realizes, and the voltage of output digital signal representative, the amplitude of current signal and phase place can require to be provided with and to revise according to reality, therefore can be used for the check character digitalized electrical energy meter of the various implementations of stating consensus standard that closes.
Be illustrated in figure 3 as in the present embodiment structural representation based on the digital signal generating means 202 of three-phase electrical power system model, this device comprises: signal parameter is provided with unit 301, signal model generation unit 302, sampling parameter and unit 303, sampled data generation unit 304, frame format is set unit 305 and digital signal output unit 306 are set.
The signal parameter that comprises voltage, electric current, power and frequency that the 301 pairs of digital signals in unit are set by signal parameter is provided with, and by sampling parameter the 303 pairs of sampling rates in unit is set and is provided with; Signal model generation unit 302 is provided with the signal parameter generation digital signal model that unit 301 sets, the data of the digital signal model that output is set up according to the three-phase power mathematical model of storage with by signal parameter; Sampled data generation unit 304 is sampled to digital signal model according to the sampling rate that is provided with, and generates sampled data; The frame format that the data of the 305 pairs of outputs in unit are set by frame format is provided with; Digital signal output unit 306 is exported sampled data according to the output data frame format framing that sets.
Wherein the three-phase power model formation is as shown in the formula shown in (1), (2):
As shown in Figure 4, wherein, signal parameter is provided with unit 301 and comprises voltage phase-splitting adjustment module 3011, electric current phase-splitting adjustment module 3012, power phase-splitting adjustment module 3013, frequency adjustment module 3014 and parameter display module 3015.
Each phase voltage amplitude by 3011 pairs of digital signals of voltage phase-splitting adjustment module is regulated, and can regulate respectively wherein each phase voltage amplitude according to actual needs; Current amplitude by 3012 pairs of digital signals of electric current phase-splitting adjustment module is provided with adjusting, also can to wherein each phase voltage amplitude adjusting be set respectively according to actual needs; Each phase power factor by 3013 pairs of digital signals of power phase-splitting adjustment module is provided with adjusting respectively; Frequency by 3014 pairs of digital signals of frequency adjustment module is provided with adjusting; Show adjustment module 3015 by parameter, the display format of signal parameter is regulated.
The initial value of each phase voltage of the three-phase power model of predeterminable this device is Un, change step is equal Un%, the initial value of each phase current is In, change step is In%, according to actual needs, can increase or reduce adjusting to the initial value Un of each phase voltage and the initial value In of electric current by change step, thereby each phase voltage amplitude of setting model, current amplitude are promptly set each the phase voltage amplitude A in the electric power system model
Ua, A
Ub, A
Uc, current amplitude A
Ia, A
Ib, A
IcThe frequency initial value that this device three-phase power model can be set equally is f
n, change step is f
n% is with f
nThe frequency step of % changes the regulating frequency initial value, thereby sets the f in the above-mentioned formula; If the phase angle difference of each phase in the three-phase model is θ=alpha-beta, each phase cos θ=+ 1.0 in the model, the power factor of the three-phase power model by regulating the θ setting device.
After finishing being provided with of each parameter in the model, signal model generation unit 302 generates digital signal models.By sampling the 303 pairs of sampling rates in unit being set is provided with, and by the sampling number that employing is provided with unit 303 module is set application service ASDU number and sampling number are set, sampled data generation unit 304 is sampled to the digital signal model that generates according to sampling rate that is provided with and sampling number, generates sampled data.
As shown in Figure 3, frame format is provided with unit 305 and comprises: data frame type is selected module 3051, and module 3052 is set the protocol package type and destination address is provided with module 3053.
After sampled data generation unit 304 generates sampled data, whether data frame type selects the voltage data of 3051 pairs of collections of module and current data to select with bag, after determining the voltage/current data are packed, the protocol package type is provided with module 3052 and according to the IEC61850 standard protocol package type is set, and destination address is provided with the MAC Address that module 3053 is provided with the equipment that receives packet.Digital signal output unit 306 according to the output data frame format framing output that sets, generates the digital signal of the three-phase electrical power system model that meets the IEC61850 standard with sampled data.
The utility model embodiment is by the digital signal generating means based on the three-phase electrical power system mathematical model, generation meets the IEC61850 standard digital signals, can be provided with flexibly by each parameter in the digital signal of this device generation, can simulate the different operation conditions of electrical network, can be the digitalized electrical energy meter verification FR test signal is provided.
As shown in Figure 6, for the utility model digitalized electrical energy meter check system to the steps flow chart that tested digitalized electrical energy meter carries out verification, below in conjunction with Fig. 2 the utility model is further described.
Step S601, the signalization parameter; In the present embodiment main control computer 201 is connected digital signal generation apparatus 202, by main control computer the parameter of digital signal generating means 202 is set, comprises: the signal parameter that digital signal generation apparatus 202 is generated voltage, electric current, power and the frequency of digital signals is provided with, the sampling rate of output data is provided with and the frame format of output data is provided with.
Step S602, the signal parameter that digital signal generating means 202 is provided with according to main control computer 201, analog electrical network operation situation, analog electrical network operation situation also generates the digital signal of standard compliant representative operation of power networks situation, meets the IEC61850 standard digital signals for tested ammeter 207 and standard scale provide;
Step S603, standard scale 204 receive the digital signal that the digital signal generating means generates, and described digital signal is carried out electric energy metrical calculate, and generate the high frequency power pulse of standard scale 204.
Step S604 obtains tested table 208 pair described digital signal and carries out the output pulses that electric energy metrical calculates generation.
Step S605, Error Calculation, the output pulses of the high frequency power pulse of the digital standard table 202 that 205 pairs of error calculating devices receive and tested digitalized electrical energy meter carries out Error Calculation, generated error result of calculation.
Step S606, the back-checking result, error calculating device 205 returns the Error Calculation result who generates to main control computer 201.
As shown in Figure 2, the network switch 203 changes into multiple signals with the digital signal branch that digital signal generating means 202 generates, use for a plurality of tested tables simultaneously, digital standard table 204 also can be by the digital signal of the network switch 203 receiving digital signals generating meanss 202 generations simultaneously; Electric light conversion equipment 206 is converted to the optical signal data frame with above-mentioned digital signal by the electrical signal data frame, and signal is given the electric energy meter of the digital quantity input with optical fiber interface by Optical Fiber Transmission; Error Calculation equipment 205 receives the output pulses of tested table 208 transmission and the output pulses that standard scale 204 sends, and according to the normal data of standard scale 204 and the measured data of tested table, generates check results; Error Calculation equipment 205 returns the check results that generates to main control computer 201.Gather the test data that the measured number electric energy meter generates by an output pulses acquisition module (being the pulse power collecting unit)
Import the electrical energy meter calibration system by digital quantity of the present utility model and realized the test of digital quantity input electrical energy meter calibration, the test event that can carry out comprises the simulation test of the test of digital quantity input measuring accuracy of electric energy meter, agreement compliance test, influence measurement examination, table meter multifunctional testing and communication abnormality state.Wherein: the agreement compliance test is meant whether the tested table meter of check meets the IEC61850-9-1 consensus standard.
The agreement compliance test: calibration equipment output meets the Frame of related protocol standard, check reception and resolution data frame that can tested table meter correct, and the error amount between the electric parameter that electric parameter that the sampled data that comprises according to the Frame that receives calculates and calibration equipment are provided with can assert that then tested table meter meets relevant consensus standard in certain scope.
Influence measures examination and is meant the influence of the change of some electric parameter to the tested table meter accuracy of measuring.Influence measures examination: calibration equipment changes some electric parameter parameters, as output signal frequency, checks the accuracy of measuring of tested table meter under different signal frequencies.
Table meter multifunctional testing is meant the functional test relevant with multifunctional electric energy meter.
The communication abnormality state verification is meant the processing power of the tested table meter of check when data transmission exception.The communication abnormality state verification: the communication abnormality state verification mainly comprises frame losing test and channel abnormal state verification.The situation of frame losing test simulation admission control is checked tested table meter processing power in this case.The channel abnormal state verification is that the data of a certain passage of Frame are set is invalid, checks tested table meter in the ability of handling this channel data.
Simultaneously main control computer also can connect digital standard table 204 and tested digitalized electrical energy meter 208 simultaneously, the output frequency of the high frequency power pulse by connecting digitizing standard scale 204 control figure standard scales, thereby the accuracy of control verification.Simultaneously main control computer 201 also can be by the computational data and the status data of the tested digitalized electrical energy meter of communication bus copy reading, and control souvenir testing process, status data are the energy data information on each road of the tested table electric system of gathering.
By the utility model embodiment digital quantity input electric energy meter is carried out verification, can verification follow the electric energy meter of the various implementations of IEC61850-9 consensus standard, thereby solved the problem that digital quantity input electric energy meter can't verification.So, utilize this calibration equipment that digital quantity input electric energy meter is carried out verification and can guarantee that not only its quality of production also can improve its reliability of operation, guarantee that it satisfies the requirement of relevant criterion, but the effective assurance that the traceability that calculates for electric energy meter electric energy in the digital transformer substation simultaneously provides.
As shown in Figure 7, the utility model also provides a kind of digitalized electrical energy meter check system 70, this system comprises: digitalized electrical energy meter calibration equipment 10 and electric energy meter 20, wherein, digitalized electrical energy meter calibration equipment 10 comprises: digital signal generating unit 101, digital signal is divided changes unit 102, test stone generation unit 103, assay generation unit 104 and at least one check interface 105;
Digital signal generating unit 101 divides commentaries on classics unit 102 to be connected with verification interface 104 with verification standard generation unit 103 by digital signal, and check results generation unit 104 is connected with the verification interface with verification standard generation unit 103 respectively; Digital signal generating unit 101 generates test of digital signal according to electric power system model, and test of digital signal is sent to digital signal branch commentaries on classics unit 102; Digital signal divides commentaries on classics unit 102 to forward the test of digital signal branch to verification standard generation unit 103 and verification interface 105; Test stone generation unit 103 received signals are divided changes the test of digital signal that unit 102 is sent, and generates the testing standard data; Verification interface 105 received signals are divided changes the test of digital signal that unit 102 is sent, and test of digital signal is transferred to the measured number electric energy meter and gathers the test data that described measured number electric energy meter generates; Check results generation unit 104 generates check results according to testing standard data and test data.
As shown in Figure 8, digitalized electrical energy meter calibration equipment of the present utility model also comprises meter hanging frame 802, carry out the parameter setting by 801 pairs of digital signal generation apparatus of main control computer, realize the communication that is connected between this device and the tested table 805 by verification interface 804, the normal data that Error Calculator 803 receives digital standard table (this figure does not indicate) generation carries out verification to the test data of the tested table 805 of collection, and check results returned main control computer 801, realized verification to tested table.
Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above only is specific embodiments of the invention; and be not intended to limit the scope of the invention; within the spirit and principles in the present invention all, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. a digitalized electrical energy meter calibration equipment is characterized in that, described device comprises: digital signal generating unit, digital signal divide changes the unit, test stone generation unit, assay generation unit and at least one check interface;
Described digital signal generating unit divides the commentaries on classics unit to be connected with the verification interface with described verification standard generation unit by described digital signal, and described check results generation unit is connected with the verification interface with described verification standard generation unit respectively; Wherein,
Described digital signal generating unit generates test of digital signal according to electric power system model, and described test of digital signal is sent to described digital signal branch commentaries on classics unit; Described digital signal divides the commentaries on classics unit to forward described test of digital signal branch to verification standard generation unit and verification interface; Described test stone generation unit receives described signal and divides the commentaries on classics test of digital signal that the unit is sent, and generates the testing standard data; Described verification interface receives described signal and divides the commentaries on classics test of digital signal that the unit is sent, and described test of digital signal is transferred to the measured number electric energy meter and gathers the test data that described measured number electric energy meter generates; Described check results generation unit generates check results according to described testing standard data and test data.
2. digitalized electrical energy meter calibration equipment as claimed in claim 1 is characterized in that, described device also comprises: main control unit, carry out the parameter setting to described digital signal generating unit.
3. digitalized electrical energy meter calibration equipment as claimed in claim 2, it is characterized in that, describedly described digital signal generating unit is carried out the parameter setting comprise: the signal parameter that comprises voltage, electric current, power and frequency to digital signal is provided with, the sampling rate of output data is provided with and the frame format of output data is provided with.
4. digitalized electrical energy meter calibration equipment as claimed in claim 1 is characterized in that, it is the network switch that described signal divides the commentaries on classics unit.
5. digitalized electrical energy meter calibration equipment as claimed in claim 1, it is characterized in that, described device also comprises: the output pulses collecting unit, be connected with the error result generation unit with described verification interface, and be used to gather the test data that described measured number electric energy meter generates.
6. digitalized electrical energy meter calibration equipment as claimed in claim 1 is characterized in that, described device also comprises: electrooptic switching element is converted to the optical signal data frame with the electrical signal data frame of described digital signal generating means.
7. digitalized electrical energy meter calibration equipment as claimed in claim 1 is characterized in that, described system also comprises: power module is each device power supply in the described digitalized electrical energy meter check system.
8. digitalized electrical energy meter calibration equipment as claimed in claim 7 is characterized in that, described device also comprises: meter hanging frame, load the measured number electric energy meter.
9. digitalized electrical energy meter check system, it is characterized in that, described system comprises: digitalized electrical energy meter calibration equipment and electric energy meter, wherein, described digitalized electrical energy meter calibration equipment comprises: the digital signal generating unit, digital signal is divided changes the unit, test stone generation unit, assay generation unit and at least one check interface;
Described digital signal generating unit divides the commentaries on classics unit to be connected with the verification interface with described verification standard generation unit by described digital signal, and described check results generation unit is connected with the verification interface with described verification standard generation unit respectively; Wherein,
Described digital signal generating unit generates test of digital signal according to electric power system model, and described test of digital signal is sent to described digital signal branch commentaries on classics unit; Described digital signal divides the commentaries on classics unit to forward described test of digital signal branch to verification standard generation unit and verification interface; Described test stone generation unit receives described signal and divides the commentaries on classics test of digital signal that the unit is sent, and generates the testing standard data; Described verification interface receives described signal and divides the commentaries on classics test of digital signal that the unit is sent, and described test of digital signal is transferred to the measured number electric energy meter and gathers the test data that described measured number electric energy meter generates; Described check results generation unit generates check results according to described testing standard data and test data.
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| CN2009202781927U CN201583642U (en) | 2009-12-22 | 2009-12-22 | Calibration apparatus and system of digital electric energy meter |
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| CN2009202781927U CN201583642U (en) | 2009-12-22 | 2009-12-22 | Calibration apparatus and system of digital electric energy meter |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103310671A (en) * | 2013-05-24 | 2013-09-18 | 北京东方计量测试研究所 | Actual metering and calibrating operation simulating equipment |
| CN104267372A (en) * | 2014-10-09 | 2015-01-07 | 国家电网公司 | Digital electric energy meter calibrating device with accurate dispersion adjustable and method thereof |
| CN104914405A (en) * | 2015-06-26 | 2015-09-16 | 国家电网公司 | Detection method and device |
| CN105510857A (en) * | 2015-12-04 | 2016-04-20 | 重庆鸿引电子有限公司 | Automatic calibration device, method and electric power meter |
| CN106405481A (en) * | 2016-11-11 | 2017-02-15 | 国网冀北电力有限公司电力科学研究院 | Nonlinear-load metering precision measuring method for digital electric energy meter |
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2009
- 2009-12-22 CN CN2009202781927U patent/CN201583642U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103310671A (en) * | 2013-05-24 | 2013-09-18 | 北京东方计量测试研究所 | Actual metering and calibrating operation simulating equipment |
| CN104267372A (en) * | 2014-10-09 | 2015-01-07 | 国家电网公司 | Digital electric energy meter calibrating device with accurate dispersion adjustable and method thereof |
| CN104267372B (en) * | 2014-10-09 | 2017-03-22 | 国家电网公司 | Digital electric energy meter calibrating device with accurate dispersion adjustable and method thereof |
| CN104914405A (en) * | 2015-06-26 | 2015-09-16 | 国家电网公司 | Detection method and device |
| CN105510857A (en) * | 2015-12-04 | 2016-04-20 | 重庆鸿引电子有限公司 | Automatic calibration device, method and electric power meter |
| CN105510857B (en) * | 2015-12-04 | 2019-08-06 | 重庆鸿引电子有限公司 | A kind of self-checking device, method and electric instrument |
| CN106405481A (en) * | 2016-11-11 | 2017-02-15 | 国网冀北电力有限公司电力科学研究院 | Nonlinear-load metering precision measuring method for digital electric energy meter |
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