CN106054110A - Intelligent electric energy meter harmonic influence testing method - Google Patents
Intelligent electric energy meter harmonic influence testing method Download PDFInfo
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- CN106054110A CN106054110A CN201610377376.3A CN201610377376A CN106054110A CN 106054110 A CN106054110 A CN 106054110A CN 201610377376 A CN201610377376 A CN 201610377376A CN 106054110 A CN106054110 A CN 106054110A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R35/04—Testing or calibrating of apparatus covered by the other groups of this subclass of instruments for measuring time integral of power or current
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Abstract
The invention discloses an intelligent electric energy meter harmonic influence testing method. A testing system is composed of a computer, a general control center, a meter position function testing module, a programmable power supply, a standard electric energy meter, a harmonic generator, a carrier box, and an even harmonic matching device. The testing system automatically switches testing wires for a basic error test and DC and even harmonic tests. The programmable power supply is adopted to provide testing current I1 and voltage U1 of a tested meter and testing current I2 and voltage U2 needed by the standard electric energy meter. The current harmonic generator is equipped for realizing harmonic output needed by electric energy detection. The carrier box is equipped for realizing carrier communication by the device. The DC even harmonic matching device is adopted to automatically match current two ends of a load to meet testing conditions of the DC even harmonic test. The method of the invention has the advantages of simplicity, accurate testing result and strong operability.
Description
Technical field
The present invention relates to a kind of intelligent electric energy meter harmonic effects method of testing.
Background technology
The equipment of industrial product with device for high-power power electronic is widely applied at the scene, owing to power electronic devices is straight
Connect the waveform changing electric current, cause harmonic current component to exceed standard, and the harmonic current produced by load end, through wire internal resistance with
And transformator internal resistance, create harmonic voltage, cause original sinusoidal voltage waveform to be also distorted.This harmonic source loads not
The only operation to electrical network impacts safely, also because of harmonic current and the existence of harmonic voltage, produces corresponding active loss,
The electric energy metrical accuracy of electrical network is impacted.This impact is mainly reflected in, the theoretical base of main metering of current electric energy meter
Plinth power triangular equation (meritorious square+idle square=apparent square), no longer sets up in the case of containing harmonic wave.Body
Metering aspect now, when on-the-spot load is to electrical network harmonic, harmonic voltage and harmonic current can produce active energy, offset
In fundamental active electric energy, all-wave electric energy is caused to count less.When electric network source is per se with harmonic wave, the harmonic wave active energy of generation
Can superpose with fundamental active electric energy, cause the many meters of all-wave electric energy.Intelligent electric energy meter is increasingly subject to weight by the influencing characterisitic of harmonic wave
Depending on.
Summary of the invention
For solving the problems referred to above, the present invention provides a kind of can test the intelligent electric energy meter the testing of influence degree by harmonic wave
Method.
Technical scheme:
A kind of intelligent electric energy meter harmonic effects method of testing, test system is by computer, overall control center, epi-position function test mould
Block, programmable power supply, standard electric energy meter, harmonic oscillator, carrier wave case, even-order harmonic coalignment form, and described test system is certainly
Dynamic conversion elementary error test, direct current and the test connection of even-order harmonic test；Programmable power supply is used to provide the test taken temperature
Test current I2 needed for electric current I1, voltage U1 and standard electric energy meter, voltage U2, be equipped with current harmonics generator and realize electric energy inspection
Survey the harmonic wave needed, be equipped with carrier wave case and realize the carrier communication of device, use automatic of direct current even-order harmonic coalignment
Join the electric current at load two ends to meet direct current even-order harmonic experimental test condition.
Beneficial effects of the present invention:
This method is simple, and test result is accurate, workable.
Accompanying drawing explanation
Fig. 1 system architecture diagram；
Fig. 2 produces the schematic diagram of electric energy harmonic wave；
Fig. 3 produces the oscillogram of direct current even-order harmonic；
Fig. 4 produces the oscillogram of subharmonic；
Fig. 5 produces the oscillogram of odd harmonic；
Fig. 6 direct current even-order harmonic measured drawing；
Fig. 7 subharmonic measured drawing；
Fig. 8 odd harmonic measured drawing；
Fig. 9 odd harmonic rising edge measured drawing.
Detailed description of the invention
As it is shown in figure 1, a kind of intelligent electric energy meter harmonic effects method of testing, test system is by computer, overall control center, table
Bit function tentative module, programmable power supply, standard electric energy meter, harmonic oscillator, carrier wave case, even-order harmonic coalignment form, institute
State test system and automatically change elementary error test, direct current and the test connection of even-order harmonic test；Employing programmable power supply provides
Test current I2, voltage U2 needed for test current I1, voltage U1 and the standard electric energy meter taken temperature, is equipped with current harmonics and occurs
Device realizes the harmonic wave that electric energy detection needs, and is equipped with carrier wave case and realizes the carrier communication of device, uses direct current even-order harmonic
The equipped electric current at Auto-matching load two ends of putting is to meet direct current even-order harmonic experimental test condition.
Under the control of the computer, power standard electrical energy pulse is sent into epi-position function test module, epi-position by standard electric energy meter
Function test module gathers calibrated meter pulse simultaneously and calculates error, utilizes the error that electric energy relative method calculates locally displayed
And upload to overall control center by high-speed industrial CAN.Data monitor by overall control center at epi-position data monitoring interface,
Manage and upload to computer disposal；Overall control center mainly completes keystroke handling, computer digital animation, multifunctional meter 485 lead to
Letter, standard scale data process (voltage, electric current, power, phase place, frequency etc.), epi-position error information gathers, voltage and current output
The work such as control, humiture data acquisition, power consumption data collection, various function test controls；The data collected are sent simultaneously
Integrated management is carried out to computer.
As in figure 2 it is shown, the test of harmonic effects amount is divided into voltage x current loop higher hamonic wave, current loop direct current and even humorous
Ripple, odd harmonic, subharmonic four kinds test.The higher hamonic wave in voltage x current loop is produced by programmable power supply, and computer will need
Overtone order, harmonic content, the parameter such as harmonic phase is sent to programmable power supply, and programmable power supply calculates full waveform through power
Exporting to tested table and standard scale after amplification, standard scale pulse and tested table pulse are compared and are calculated this by Error Calculator
Plant the error of tested table under harmonic wave.Under control of the computer programmable power supply can produce multiple higher hamonic wave combination carry out error school
Test, it is possible to comparing with pure first-harmonic error calculates the impact of higher hamonic wave error.
During test, harmonic wave generation control circuit receives computer control instruction, controls the closed and disconnected of K1, K2, K3, control
Electrical switch processed is by setting sequential conducting and disconnecting.Auto-matching control circuit changes according to the size of current on current sampling resistor
Become variable resistance resistance and regulate two loop currents to equal.During anharmonic wave test, K1 closes, and K2, K3 disconnect, programmable power supply all-wave
Electric current all-wave is through tested table and standard scale, and this kind of connection is identical with conventional checking table.This method requires to control electronic cutting
The triggering signal closed is Tong Bu with current source, and control point is accurate.
As shown in Figure 3 and Figure 6, when direct current and even-order harmonic test, owing to standard scale current detection circuit is directly accessed idol
There is bigger error during subharmonic current, therefore standard scale is accessed full-wave electric current, now K2 Guan Bi, K1, K3 disconnect, at electronic cutting
The positive half cycle controlling lower current source current of pass 1 and electrical switch 2 flows through tested electric energy meter, and negative half period flows through build-out resistor and returns
Road, at K2, junction positive-negative half-cycle is all back to current source through standard electric energy meter.Due to the transient response problem of programmable current source,
Tested table loop and matching circuit electric current can be caused when tested table loop and matching circuit resistance are unbalanced unequal, cause and be
System error, arranges automatic match circuit (direct current even-order harmonic Auto-matching instrument), here at two-way circuit inside even matching box
Arranging current sampling resistor on loop, arrange variable resistance at matching circuit, Auto-matching control circuit is according to two-way sampling electricity
Size of current regulation variable resistance in resistance makes two-way electric current equal, thus eliminates the systematic error caused because of coupling.Even is humorous
Tested table constant is set to the 1/2 of nominal value, by standard scale pulse and tested table pulse by ripple verification calculation of error device
Comparing and calculate the error of tested table under direct current even-order harmonic, this error is compared with all-wave error under same current can
Draw direct current even harmonic errors influence amount.Produce the oscillogram of direct current even-order harmonic as indicated at 3, wherein, in oscillogram, horizontal
In the coordinate representation cycle (ms), vertical coordinate represents the amplification (lower same) of waveform.
As shown in figs. 4 and 7, during subharmonic test, standard scale current detection circuit is also accessed subharmonic current, now
K3 closes, and K1, K2 disconnect, under the control of electrical switch 1 and electrical switch 2, and the first two periodic stream of every four periodic currents
Matched loop, latter two cycle flows through tested table and standard scale loop.Error Calculator is by standard scale pulse and tested
Table pulse is compared and is calculated the error of tested table under subharmonic, and this error is compared with all-wave error under same current can
Draw subharmonic error influence amount.The oscillogram that subharmonic produces is as shown in Figure 4.
As shown in Fig. 5, Fig. 8 and Fig. 9, during odd harmonic test, standard scale current detection circuit is also accessed odd harmonic
Electric current, now K3 Guan Bi, K1, K2 disconnect, under the control of electrical switch 1 and electrical switch 2, first 1/4 week of each cycle electric current
Phase and the 3rd the 1/4 matched loop of periodic stream, second 1/4 cycle and the 4th 1/4 cycle flow through tested table and standard scale
Loop.Error Calculator calculates the mistake of tested table under odd harmonic by comparing standard scale pulse and tested table pulse
Difference, this error is compared with all-wave error under same current can draw odd harmonic error influence amount.
As shown in table 1, in process of the test, system and device voltage wave shape distortion degree is 0.3%, and the current waveform distortion factor is
0.2%, power stability is 0.04%/120s, and rate-adaptive pacemaker scope is 45Hz-65Hz, and voltage output range of accommodation is 0-120%,
Electric current output range of accommodation is 0-120%, frequency fineness adjustment 0.01Hz.
Test system not only can carry out conventionally test, also achieves and surveys voltage circuit measurement of power loss, current loop power consumption
Examination, the test of harmonic effects amount, active report of event test, communication module exchange ability test, communication module interface load capacity
The test of the new projects such as test, wherein by harmonic test, draws data below:
In the range of 0-50Hz, 50-100KHz, 100-150 KHz, the content of direct current harmonic wave is respectively 83%, 60%, 8%,
In the range of 37.5HZ, 62.5Hz, the content of subharmonic is 81.3%, 59.0%, odd harmonic number of times be respectively 3 times, 5 times, 7 times, 9
Secondary, 11 times, 13 times, in the case of 15 times, harmonic content is respectively 54.2%, 19.5%, 17.3%, 13.2%, 11.1%, 8.1%,
8.2%.Meet GB GB/T17215.321-2008(12 level state type active electric energy meter) to current DC even-order harmonic, secondary humorous
Ripple, the requirement of odd harmonic waveform.
Table 1 harmonic wave experimental result
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses the present invention.To this
The multiple amendment of a little embodiments will be apparent from for those skilled in the art, as defined herein typically
Principle can realize without departing from the spirit or scope of the present invention in other embodiments.Therefore, the present invention will not
Can be intended to be limited to the embodiments shown herein, and be to fit to consistent with principles disclosed herein and features of novelty
The widest scope.
Claims (1)
1. an intelligent electric energy meter harmonic effects method of testing, it is characterised in that: test system is by computer, overall control center, table
Bit function tentative module, programmable power supply, standard electric energy meter, harmonic oscillator, carrier wave case, even-order harmonic coalignment form, institute
State test system and automatically change elementary error test, direct current and the test connection of even-order harmonic test；Employing programmable power supply provides
Test current I2, voltage U2 needed for test current I1, voltage U1 and the standard electric energy meter taken temperature, is equipped with current harmonics and occurs
Device realizes the harmonic wave that electric energy detection needs, and is equipped with carrier wave case and realizes the carrier communication of device, uses direct current even-order harmonic
The equipped electric current at Auto-matching load two ends of putting is to meet direct current even-order harmonic experimental test condition.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106443567A (en) * | 2016-12-02 | 2017-02-22 | 国网安徽省电力公司电力科学研究院 | Real-load test system for electric energy meters |
| CN106772209A (en) * | 2017-01-11 | 2017-05-31 | 国网江西省电力公司电力科学研究院 | For electric energy meter direct current and the load automatic matching device of even-order harmonic influence experiment |
| CN110907700A (en) * | 2019-11-26 | 2020-03-24 | 国网浙江省电力有限公司电力科学研究院 | Direct-current electric energy meter for direct-current distribution network and metering method |
| CN111289943A (en) * | 2020-02-28 | 2020-06-16 | 深圳市科陆精密仪器有限公司 | Electric energy meter calibration method and system |
| CN111562542A (en) * | 2020-05-31 | 2020-08-21 | 宁夏隆基宁光仪表股份有限公司 | Electric energy meter fault excitation test environment construction system and method |
| CN113826018A (en) * | 2019-03-22 | 2021-12-21 | 兰迪斯+盖尔创新有限公司 | Validating fundamental-only energy measurements |
| CN114114130A (en) * | 2021-09-18 | 2022-03-01 | 宁夏隆基宁光仪表股份有限公司 | Electric energy meter testing method, system and device based on actual load on simulation site |
| RU2775865C1 (en) * | 2021-09-30 | 2022-07-11 | Общество с ограниченной ответственностью "МИРТЕК" | Method for monitoring the performance of an active electric energy meter |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106443567A (en) * | 2016-12-02 | 2017-02-22 | 国网安徽省电力公司电力科学研究院 | Real-load test system for electric energy meters |
| CN106443567B (en) * | 2016-12-02 | 2023-06-16 | 国网安徽省电力公司电力科学研究院 | Real load test system of electric energy meter |
| CN106772209A (en) * | 2017-01-11 | 2017-05-31 | 国网江西省电力公司电力科学研究院 | For electric energy meter direct current and the load automatic matching device of even-order harmonic influence experiment |
| CN106772209B (en) * | 2017-01-11 | 2023-07-04 | 国网江西省电力公司电力科学研究院 | Automatic load matching device for electric energy meter direct current and even harmonic influence test |
| CN113826018A (en) * | 2019-03-22 | 2021-12-21 | 兰迪斯+盖尔创新有限公司 | Validating fundamental-only energy measurements |
| CN110907700A (en) * | 2019-11-26 | 2020-03-24 | 国网浙江省电力有限公司电力科学研究院 | Direct-current electric energy meter for direct-current distribution network and metering method |
| CN110907700B (en) * | 2019-11-26 | 2021-12-07 | 国网浙江省电力有限公司营销服务中心 | Direct-current electric energy meter for direct-current distribution network and metering method |
| CN111289943A (en) * | 2020-02-28 | 2020-06-16 | 深圳市科陆精密仪器有限公司 | Electric energy meter calibration method and system |
| CN111562542A (en) * | 2020-05-31 | 2020-08-21 | 宁夏隆基宁光仪表股份有限公司 | Electric energy meter fault excitation test environment construction system and method |
| CN114114130A (en) * | 2021-09-18 | 2022-03-01 | 宁夏隆基宁光仪表股份有限公司 | Electric energy meter testing method, system and device based on actual load on simulation site |
| CN114114130B (en) * | 2021-09-18 | 2024-05-14 | 宁夏隆基宁光仪表股份有限公司 | Electric energy meter testing method, system and device based on simulation site actual load |
| RU2775865C1 (en) * | 2021-09-30 | 2022-07-11 | Общество с ограниченной ответственностью "МИРТЕК" | Method for monitoring the performance of an active electric energy meter |
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