CN105911512A - Intelligent electric energy meter constant test system and test method thereof - Google Patents
Intelligent electric energy meter constant test system and test method thereof Download PDFInfo
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- CN105911512A CN105911512A CN201610394714.4A CN201610394714A CN105911512A CN 105911512 A CN105911512 A CN 105911512A CN 201610394714 A CN201610394714 A CN 201610394714A CN 105911512 A CN105911512 A CN 105911512A
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- 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
- G01R35/04—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 constant test system. The system comprises a standard source, a standard meter, at least one detected electric energy meter, an error arithmetic unit and a communication interface. The system is characterized in that the standard source can arbitrarily set a voltage, a current and a power factor, provides a three-phase voltage for the standard meter and a detected voltage line and provides a three-phase current for a current line; a detected meter is connected in parallel to each phase of voltage line of the standard meter, and the electric energy meter is connected in series with each phase of current line of the standard meter; and the electric energy meter and the standard meter are connected to the error arithmetic unit through the communication interface respectively. In the invention, based on a traditional standard meter method, under a selected operation condition, the detected meter and the standard meter simultaneously operate for a period of time and electrical energy values of the two are compared so as to acquire an error of the detected electric energy meter; and according to a relation of the error and a basic error limit of the detected electric energy meter, whether a constant of the detected meter satisfies a requirement under the selected operation condition can be determined.
Description
Technical field
The invention belongs to Electric Energy Metering Technology field, in particular to a kind of intelligent electric energy meter constant test be
System and test method thereof.
Background technology
The constant of intelligent electric energy meter is relation between the electric energy representing instrument record with corresponding test output numerical value
Numerical value, the accumulation electric energy that it records is carried out record by register, and corresponding test output numerical value can be defeated by pulse
The electrical/optical umber of pulse going out device output is calculated.According to GB/T 17215.321 requirement, the test of electric energy meter
Relation between output and display instruction, should be consistent with famous brand.
At present, intelligent electric energy meter constant test method is divided into three kinds: meter read pulse method, have good luck test method(s) and mark
Quasi-table method.Meter read pulse method is to be the bar of 1 in reference frequency, reference voltage, maximum current and power factor
Under part, making the position, register end of tested electric energy meter change at least 1 numeral, then detection output umber of pulse is
No meet corresponding requirements；Test method(s) of having good luck is to connect two only referring to the current circuit of table with each tested table, electricity
Pressure lines in parallel, under conditions of reference frequency, reference voltage and maximum current and power factor are 1, makes
The number that tested table register last figure changes, no less than specified quantity, then detects reference table and other quilts
Whether the registration of inspection table meets corresponding requirement；Method of standard table is by tested table and the electricity of a standard electric energy meter
Flow Line is connected, and voltage circuit is in parallel, is 1 in reference frequency, reference voltage, maximum current and power factor
Under conditions of, detect whether tested table error after running a period of time meets requirement.
Wherein, meter read pulse method require output umber of pulse N and the calculated energy value of constant of electric energy meter C with
The record value of register should be consistent, the shortcoming with poor operability；Have good luck test method(s) before the test, need to be
In the tested electric energy meter that specification is identical, choose that error is relatively stable and two electric energy meters known to constant are as ginseng
According to table, testing result is easily affected by the error robustness of reference table.Traditional method of standard table simple to operate and
Easily realize, but be the most only the condition of 1 in reference frequency, reference voltage, maximum current and power factor
Under test, the method cannot ensure that the constant of tested table also meets requirement under other operating conditions.
Summary of the invention
The invention aims to overcome the deficiencies in the prior art, it is provided that a kind of intelligent electric energy meter constant examination
Check system and method, for inspection under different operating conditions, the electric energy of intelligent electric meter record is with corresponding
Relation between test output numerical value is the most consistent with famous brand.
In order to solve above-mentioned technical problem, the present invention is to be achieved through the following technical solutions:
A kind of intelligent electric energy meter constant pilot system, including: standard source, standard scale, at least one tested electricity
Can table, error op device, communication interface, it is characterised in that described standard source can arbitrarily setting voltage, electricity
Stream and power factor, provide three-phase voltage to standard scale and detected voltage circuit, carry to current circuit
For three-phase current；Described tested table is the most in parallel with each phase voltage circuit of described standard scale, described electric energy meter with
Each phase current circuit of described standard scale is all connected；Described electric energy meter connects each via communication with described standard scale
Mouth is connected with described error op device.
Preferably, described electric energy meter and the same same line of described standard scale.
Preferably, described communication interface selects RS485.
Preferably, when the specification of at least one tested electric energy meter described is identical, each tested electric energy in system
The current circuit of table is all connected, and voltage circuit is the most in parallel.
During test, first choose one piece of standard scale, tested table is in parallel with the voltage circuit of this standard scale, electric current
Circuit is connected；Voltage U, the reference voltage U of this value and tested table is applied at voltage circuitnEqual；At electric current
Circuit applies I, and I >=Ist, wherein: IstStarting current for tested table；The voltage of voltage circuit applying and electricity
Between the electric current that Flow Line applies, phase place can arbitrarily set, i.e. power factor is
Make the standard scale chosen and tested table run a period of time t, and t >=t simultaneouslym, wherein tmIt is to be satisfied
The minimum test duration required；Then error γ of tested table is calculated:Wherein: E' is quilt
The electric energy indicating value that inspection electric energy meter was walked within the t section time, the electricity that E is walked within the t section time by standard electric energy meter
Can indicating value.
If EmThe minimum energy value passed through by the tested table of satisfied requirement, then for reducing the mistake calculating tested table
During difference, the error that the influence factor such as the constant of standard electric energy meter and tested table resolution is introduced, should make tested
Electric energy E' >=E that table passes through in time tm；
EmCan be obtained by following formula:
In above formula, R is the apparent resolution of tested Electric energy meter KWh counter；B is that tested electric energy meter is at load current
For I and power factor it isUnder limit of intrinsic error.
tmCan be obtained by following formula:
Now, can judge whether constant of electric energy meter test meets in the following manner to require: whenTime, then
The constant test of this tested electric energy meter is I and power factor is at load currentUnder meet requirement；WhenTime, then the constant test of this tested electric energy meter is I and power factor is at load currentLower discontented
Foot requirement.
It should be noted that the method can be at U=UnWith I >=IstUnder conditions of, arbitrarily choose current amplitude and
Power factor, to judge whether tested electric energy meter constant under different operating conditions meets requirement；To same
The electric energy meter of specification, can all connect the current circuit of each electric energy meter, and voltage circuit is the most in parallel, logical
Cross error γ reading each tested table, can determine whether whether the constant of all tested tables meets requirement.
Compared with prior art, the invention has the beneficial effects as follows: the present invention based on traditional method of standard table,
Under selected operating condition, make tested table and standard scale run a period of time simultaneously, and by the two walked electric energy
Indicating value compares, and obtains the error of tested electric energy meter, limits with tested Basic Error of Energy Meter according to this error
Relation, can determine whether whether tested table constant meets requirement under selected operating condition.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the present invention；
Fig. 2 is the constant experiment process figure of the present invention.
Detailed description of the invention
With detailed description of the invention, the present invention is described in further detail below in conjunction with the accompanying drawings:
A kind of intelligent electric energy meter constant pilot system of the present invention, including: standard source, standard scale, at least one
Individual tested electric energy meter, error op device, communication interface, it is characterised in that described standard source can arbitrarily set
Voltage, electric current and power factor, provide three-phase voltage to standard scale and detected voltage circuit, give electricity
Flow Line provides three-phase current；Described tested table is the most in parallel with each phase voltage circuit of described standard scale, described
Electric energy meter is all connected with each phase current circuit of described standard scale；Described electric energy meter each leads to described standard scale
Cross communication interface to be connected with described error op device.
Preferably, described electric energy meter and the same same line of described standard scale.
Preferably, described communication interface selects RS485.
Preferably, when the specification of at least one tested electric energy meter described is identical, each tested electric energy in system
The current circuit of table is all connected, and voltage circuit is the most in parallel.
As a example by tested electric energy meter is for the accuracy electric energy meter for A level, illustrate to utilize the present invention to carry out
Under the conditions of constant of electric energy meter test: standard source can arbitrarily setting voltage, electric current and power factor, give and mark
Quasi-table and detected voltage circuit provide three-phase voltage, provide three-phase current to current circuit.Tested table with
Each phase voltage circuit of standard scale is the most in parallel, and electric energy meter is all connected with each phase current circuit of standard scale.Test
Time, voltage circuit applies the reference voltage U of electric energy metern；Apply I at current circuit, and meet I >=Ist, its
In: IstFor the starting current of tested table, in this example, control standard source and make voltage and current same phase,
I.e.
Make the standard scale chosen and tested table run a period of time t, and t >=t simultaneouslym, the shortest for satisfied requirement
Test period tmCan be obtained by following formula:
Wherein EmIt is the minimum energy value passed through by the tested table of satisfied requirement, can be obtained by following formula:
In formula, R is the apparent resolution of tested Electric energy meter KWh counter；B is that tested electric energy meter is at load current
I and power factor areUnder limit of intrinsic error.
Error op device is attached by communication interfaces such as RS485, reads tested electric energy meter in the t section time
The numerical value of electric energy indicating value E that interior walked electric energy indicating value E' and standard electric energy meter were walked within the t section time, and count
Calculate the error of tested table
Due toAccording to the value of load current I, the expression of the limit of intrinsic error b of available tested table
Formula:
In formula, IstFor starting current, IminFor minimum current, ItrFor breakover current, ImaxFor maximum current,
The most each electric current index is provided by ammeter producer, and meets R46 international recommendation, EN50470 mark
Standard or the regulation of other standards.
The relation between error γ and b/10 according to tested table, it may be determined that whether tested table constant meets requires:
WhenTime, then the constant of this tested electric energy meter is I and power factor at load currentUnder the conditions of full
Foot requirement；WhenTime, then the constant of this tested electric energy meter is I and power factor at load current
Under be unsatisfactory for requirement.
It should be noted that in the schematic diagram shown in Fig. 1, tested table is three-phase and four-line, then standard scale when testing is also
Should be three-phase and four-line, if tested table is phase three-wire three or single-phase, then corresponding standard scale also should be three-phase three
Line or single-phase.The mode of connection between standard source and tested table and standard scale is changed accordingly according to ammeter type.
It is the constant experiment process figure of the present invention shown in Fig. 2, specifically comprises the following steps that
Step 1, according to each current parameters of tested table, selectivity constant test current I and power factor
Step 2, applies the value of electric current I, determines the limit of intrinsic error b under this POL according to test；
Step 3, determines the minimum energy value E that tested table is passed throughm；
Step 4, determines minimum test duration t meeting constant test requirements documentm；
Step 5, by parallel to tested table and standard scale voltage circuit, applies voltage Un；By tested table and standard
Table current circuit is connected, and applies electric current I；Standard scale and tested table run a period of time t simultaneously；
Step 6, it may be judged whether meet t >=tm；If meeting and carrying out step 7, if being unsatisfactory for, return step 5,
Reselect operation time t；
Step 7, error op device calculates the error of tested table
Step 8, it may be judged whether meetIf meeting, the test of the most tested table constant at load current I and
Power factorUnder the conditions of qualified, if being unsatisfactory for, the test of the most tested table constant load current I and power because of
NumberUnder the conditions of defective.
Above example only in order to technical scheme to be described, is not intended to limit；Although with reference to aforementioned
The present invention has been described in detail by embodiment, it will be understood by those within the art that；It is still
Technical scheme described in previous embodiment can be modified, or wherein portion of techniques feature is carried out
Equivalent；And these amendments or replacement, do not make the essence of appropriate technical solution depart from the present invention and implement
The spirit and scope of example technical scheme.
Claims (5)
1. an intelligent electric energy meter constant pilot system, including: standard source, standard scale, at least one is tested
Electric energy meter, error op device, communication interface, it is characterised in that described standard source can arbitrarily setting voltage,
Electric current and power factor, provide three-phase voltage, to current circuit to standard scale and detected voltage circuit
Three-phase current is provided；Described tested table is the most in parallel with each phase voltage circuit of described standard scale, described electric energy meter
All connect with each phase current circuit of described standard scale；Described electric energy meter and described standard scale are each via communication
Interface is connected with described error op device.
A kind of intelligent electric energy meter constant pilot system the most according to claim 1, it is characterised in that institute
State electric energy meter and the same same line of described standard scale.
A kind of intelligent electric energy meter constant pilot system the most according to claim 1, it is characterised in that institute
Stating communication interface is RS485.
A kind of intelligent electric energy meter constant pilot system the most according to claim 1, it is characterised in that institute
State the specification of at least one tested electric energy meter identical time, the current circuit of each tested electric energy meter in system is whole
Series connection, voltage circuit is the most in parallel.
5. an intelligent electric energy meter constant test method, including:
Step 1, takes the tested table of same kind and standard scale, and according to each current parameters of tested table, selectivity constant is tested
Electric current I and power factor
Step 2, applies the value of electric current I, determines the limit of intrinsic error b under this POL according to test；
Step 3, determines the minimum energy value E that tested table is passed throughm；
Step 4, determines minimum test duration t meeting constant test requirements documentm；
Step 5, by parallel to tested table and standard scale voltage circuit, applies voltage Un；By tested table and standard
Table current circuit is connected, and applies electric current I；Standard scale and tested table run a period of time t simultaneously；
Step 6, it may be judged whether meet t >=tm；If meeting and carrying out step 7, if being unsatisfactory for, return step 5,
Reselect operation time t；
Step 7, error op device calculates the error of tested tableWherein: E' is tested electric energy
The electric energy indicating value that table was walked within the t section time, E is by being walked in the standard electric energy meter t section time at runtime
Electric energy indicating value；
Step 8, it may be judged whether meetIf meeting, the test of the most tested table constant at load current I and
Power factorUnder the conditions of qualified, if being unsatisfactory for, the test of the most tested table constant load current I and power because of
NumberUnder the conditions of defective.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106569850A (en) * | 2016-10-17 | 2017-04-19 | 中国电力科学研究院 | Electric energy meter with independent metering part and management part, and check method of electric energy meter |
| CN107861089A (en) * | 2017-09-26 | 2018-03-30 | 国网江西省电力公司电力科学研究院 | A kind of intelligent electric energy meter method of testing for being adapted to exceptional operating conditions |
| CN108152782A (en) * | 2017-12-05 | 2018-06-12 | 国家电网公司 | A kind of test method of massive quantity power supply and measurement electric energy meter more positive coefficient |
| CN108169704A (en) * | 2018-01-20 | 2018-06-15 | 国网江西省电力有限公司电力科学研究院 | A kind of intelligent electric energy meter composition error detection method |
| CN109655779A (en) * | 2018-12-29 | 2019-04-19 | 深圳市科陆精密仪器有限公司 | Electric energy meter is had good luck read method, detection method, the apparatus and system of electricity |
| CN110007263A (en) * | 2019-05-17 | 2019-07-12 | 贵州电网有限责任公司 | The test device and method that voltage flicker and temperature influence electric energy meter measurement error |
| CN110780139A (en) * | 2019-11-13 | 2020-02-11 | 湖南省计量检测研究院 | Method for measuring working error of electric vehicle charger |
| CN110888100A (en) * | 2019-11-29 | 2020-03-17 | 国网重庆市电力公司电力科学研究院 | Single-phase intelligent electric energy meter online on-load detection system and method |
| CN111413661A (en) * | 2020-05-06 | 2020-07-14 | 郑州万特电气股份有限公司 | Detection method for instrument constant test by adopting standard meter method |
| CN111707983A (en) * | 2020-07-13 | 2020-09-25 | 郑州万特电气股份有限公司 | Method, equipment, system and medium for testing constant of electric energy meter |
| CN111896909A (en) * | 2020-07-16 | 2020-11-06 | 河南省计量科学研究院 | Electric energy meter error correction method and device |
| CN116430301A (en) * | 2023-06-15 | 2023-07-14 | 中国电力科学研究院有限公司 | Low-current low-power factor test system, method, device, equipment and medium |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106569850B (en) * | 2016-10-17 | 2020-10-09 | 中国电力科学研究院 | Electric energy meter with independent metering part and management part and calibration method thereof |
| CN106569850A (en) * | 2016-10-17 | 2017-04-19 | 中国电力科学研究院 | Electric energy meter with independent metering part and management part, and check method of electric energy meter |
| CN107861089A (en) * | 2017-09-26 | 2018-03-30 | 国网江西省电力公司电力科学研究院 | A kind of intelligent electric energy meter method of testing for being adapted to exceptional operating conditions |
| CN108152782A (en) * | 2017-12-05 | 2018-06-12 | 国家电网公司 | A kind of test method of massive quantity power supply and measurement electric energy meter more positive coefficient |
| CN108169704A (en) * | 2018-01-20 | 2018-06-15 | 国网江西省电力有限公司电力科学研究院 | A kind of intelligent electric energy meter composition error detection method |
| CN109655779B (en) * | 2018-12-29 | 2021-11-19 | 深圳市科陆精密仪器有限公司 | Reading method, detection method, device and system for electric energy meter running electric quantity |
| CN109655779A (en) * | 2018-12-29 | 2019-04-19 | 深圳市科陆精密仪器有限公司 | Electric energy meter is had good luck read method, detection method, the apparatus and system of electricity |
| CN110007263A (en) * | 2019-05-17 | 2019-07-12 | 贵州电网有限责任公司 | The test device and method that voltage flicker and temperature influence electric energy meter measurement error |
| CN110780139A (en) * | 2019-11-13 | 2020-02-11 | 湖南省计量检测研究院 | Method for measuring working error of electric vehicle charger |
| CN110888100A (en) * | 2019-11-29 | 2020-03-17 | 国网重庆市电力公司电力科学研究院 | Single-phase intelligent electric energy meter online on-load detection system and method |
| CN111413661A (en) * | 2020-05-06 | 2020-07-14 | 郑州万特电气股份有限公司 | Detection method for instrument constant test by adopting standard meter method |
| CN111413661B (en) * | 2020-05-06 | 2022-03-29 | 郑州万特电气股份有限公司 | Detection method for instrument constant test by adopting standard meter method |
| CN111707983A (en) * | 2020-07-13 | 2020-09-25 | 郑州万特电气股份有限公司 | Method, equipment, system and medium for testing constant of electric energy meter |
| CN111707983B (en) * | 2020-07-13 | 2024-03-22 | 郑州万特电气股份有限公司 | Electric energy meter constant test method, equipment, system and medium |
| CN111896909A (en) * | 2020-07-16 | 2020-11-06 | 河南省计量科学研究院 | Electric energy meter error correction method and device |
| CN116430301A (en) * | 2023-06-15 | 2023-07-14 | 中国电力科学研究院有限公司 | Low-current low-power factor test system, method, device, equipment and medium |
| CN116430301B (en) * | 2023-06-15 | 2023-09-05 | 中国电力科学研究院有限公司 | Low-current low-power factor test system, method, device, equipment and medium |
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