CN106872928A - The electric energy meter and self checking method of a kind of electric energy self checking - Google Patents

The electric energy meter and self checking method of a kind of electric energy self checking Download PDF

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Publication number
CN106872928A
CN106872928A CN201710037446.5A CN201710037446A CN106872928A CN 106872928 A CN106872928 A CN 106872928A CN 201710037446 A CN201710037446 A CN 201710037446A CN 106872928 A CN106872928 A CN 106872928A
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CN
China
Prior art keywords
current
electric energy
energy meter
electric
coil
Prior art date
Application number
CN201710037446.5A
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Chinese (zh)
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CN106872928B (en
Inventor
杜小涛
何昂
胡志刚
程雪利
Original Assignee
宁波三星医疗电气股份有限公司
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Priority to CN201710037446.5A priority Critical patent/CN106872928B/en
Publication of CN106872928A publication Critical patent/CN106872928A/en
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Publication of CN106872928B publication Critical patent/CN106872928B/en

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R35/00Testing or calibrating of apparatus covered by the preceding groups
    • G01R35/04Testing or calibrating of apparatus covered by the preceding groups of instruments for measuring time integral of power or current

Abstract

The present invention discloses the electric energy meter and self checking method of a kind of electric energy self checking, using the computation chip output reference electric current being provided with inside electric energy meter, and record the measurement data and the normal data without reference current of reference current, compare by by measurement data and normal data, so as to calculate the measured value of current loop, compared with the accuracy value of corresponding device so as to judge check results with this measured value, verified from after with regard to again need not dismantle back electric energy meter, reduces cost, the consumption of time is prevented, verification efficiency is improve.

Description

The electric energy meter and self checking method of a kind of electric energy self checking

Technical field

Instrument check field of the present invention, and in particular to the electric energy meter and self checking method of a kind of electric energy self checking.

Background technology

Used as a kind of electric energy measurement instrument, its precision must is fulfilled for national related mark to electric energy meter within its life cycle Standard, therefore the electric energy meter that electric-power metering department will periodically align in use verified, to check its available accuracy and correlation Other parameters;But at present, the verification of electric energy meter needs to tear back open electric energy meter, accesses mark in factory or in laboratory to it Accurate electric signal, measures the apparent value error between electric energy and standard electric energy meter to confirm the metering essence of meter by contrast table meter Degree;Meter installation is retell after the completion of verification to go back, causes freight charges maintenance cost high, while during the entire process of electric energy meter is dismounted Must have a power failure, it is cumbersome, and there is the unmeasurable situation of user power utilization after electric energy meter is torn open back.

The content of the invention

The purpose of the present invention is to realize electric energy meter self checking to provide one kind, solves the problems, such as that electric energy meter cannot field-checking Electric energy meter and self checking method.

In order to solve the above technical problems, the present invention is achieved through the following technical solutions:A kind of electric energy meter of electric energy self checking, Including the computation chip summation current transformer being arranged on inside electric energy meter and the verification button being arranged on electric energy meter casing, institute The side for stating current transformer is provided with first coil and the second coil, and the opposite side of the current transformer is provided with the 3rd line Circle, the first coil connection power network is used to be input into user load electric current, and the computation chip is connected to electricity by sample circuit The tertiary coil of current transformer opposite side, the second coil that the computation chip is additionally coupled to current transformer side is used to be input into Reference current.

A kind of method of electric energy meter self checking, step is as follows:

Step a:The verification button on electric energy meter casing is pressed, starts electric energy meter self checking;

Step b:User load electric current enters through current transformer to tertiary coil from first coil, and measured chip passes through Sampling circuit samples electric current obtains the first tested electric current and records;

Step c:The second coil input of computation chip from connected current transformer side is in the same direction with user load electric current Reference current, then obtain the second tested electric current by sampling circuit samples, the described second tested electric current is equal to the first tested electricity Stream adds auxiliary base electric current;

Step d:By being calculated the measurement power of reference current the is subtracted for auxiliary reference current is equal to the second tested electric current One tested electric current;

Step e:The measured value for finally calculating current loop is that auxiliary reference current subtracts the difference after reference current divided by base Quasi- electric current;Compared so as to judge check results with the accuracy value of corresponding device with this measured value.

The present invention records the measurement number of reference current using the computation chip output reference electric current being provided with inside electric energy meter According to the normal data without reference current, compare by by measurement data and normal data, so as to calculate electric current The measured value in loop, is compared so as to judge check results with this measured value with the accuracy value of corresponding device, from just without again by electricity Energy table is verified after dismantling back, and reduces cost prevents the consumption of time, improves verification efficiency.

Compared with prior art, the present invention is advantageous in that:1)Can be entered by electric energy meter itself part at the scene Row self checking, solves the problems, such as that electric energy meter cannot field-checking;2)Go back to verify without dismantling electric energy meter again so that transport maintenance Expense reduction, reduces cost;3)Need to have a power failure during preventing dismounting electric energy meter, it is time saving and energy saving.

Brief description of the drawings

Fig. 1 is structural representation of the invention.

Specific embodiment

Below in conjunction with the accompanying drawings with specific embodiment, the invention will be further described.

See Fig. 1, a kind of electric energy meter of electric energy self checking, including be arranged on computation chip and Current Mutual Inductance inside electric energy meter Device and the verification button being arranged on electric energy meter casing, the side of the current transformer are provided with first coil A and second Coil B, the opposite side of the current transformer is provided with tertiary coil C, and the first coil A connections power network is used to be input into user Load current I1, the computation chip is connected to the tertiary coil C of current transformer opposite side, the metering by sample circuit The second coil B that chip is additionally coupled to current transformer side is used for input reference electric current I3.

In present embodiment, a kind of method of electric energy meter self checking, step is as follows:

Step a:The verification button on electric energy meter casing is pressed, starts electric energy meter self checking;

Step b:User load electric current I1 enters through current transformer to tertiary coil C from first coil A, and be measured chip First tested electric current I2 is obtained by sampling circuit samples electric current and is recorded;

Step c:The second coil B inputs of computation chip from connected current transformer side are same with user load electric current I1 To reference current I3, then obtain the second tested electric current I4 by sampling circuit samples, the described second tested electric current I4 is equal to the One tested electric current I2 adds auxiliary base electric current I3a;

Step d:By being calculated the measurement power of reference current I3 for auxiliary reference current I3a is equal to the second tested electric current I4 Subtract the first tested electric current I2;

Step e:The measured value for finally calculating current loop is that the difference for aiding in reference current I3a to subtract after reference current I3 is removed With reference current I3;Compared so as to judge check results with the accuracy value of corresponding device with this measured value.

In present embodiment, standard model source is embedded with computation chip, for output reference electric current I3, presses electric energy After verification button on watch shell, computation chip first will not output reference electric current I3, it can in only user load electric current I1 In the case of input, the first tested electric current I2 is obtained by sampling circuit samples;Re-recording just can be defeated after the first tested electric current I2 Go out reference current I3, because the reference current I3 and user load electric current I1 of injection are in the same direction, then just can pass through sampling circuit samples Obtain the second tested electric current I4, I4=I2+I3a;Therefore it is auxiliary base to be calculated the corresponding measurement power of reference current I3 Electric current I3a, I3a=I4-I2;The measurement error value of current loop is calculated again for auxiliary reference current I3a subtracts benchmark electricity Difference after stream I3 divided by reference current I3, as(I3a- I3)/ I3;Finally with this measured value and the accuracy value ratio of corresponding device Compared with so as to judge check results, if its measured value is in the range of the accuracy value of corresponding device, it is qualified to verify, if its measured value is not In the range of the accuracy value of corresponding device, then verify unqualified.

Protection scope of the present invention includes but is not limited to embodiment of above, and protection scope of the present invention is with claims Be defined, any replacement being readily apparent that to those skilled in the art that this technology is made, deformation, improvement each fall within it is of the invention Protection domain.

Claims (2)

1. a kind of electric energy meter of electric energy self checking, including be arranged on the computation chip summation current transformer inside electric energy meter and set Put the verification button on electric energy meter casing, it is characterised in that:The side of the current transformer is provided with first coil(A)With Second coil(B), the opposite side of the current transformer is provided with tertiary coil(C), the first coil(A)Connection power network is used In input user load electric current(I1), the computation chip is connected to the 3rd line of current transformer opposite side by sample circuit Circle(C), the computation chip is additionally coupled to the second coil of current transformer side(B)For input reference electric current(I3).
2. a kind of method of electric energy meter self checking, it is characterised in that step is as follows:
Step a:The verification button on electric energy meter casing is pressed, starts electric energy meter self checking;
Step b:User load electric current(I1)From first coil(A)In enter through current transformer to tertiary coil(C), counted Amount chip obtains the first tested electric current by sampling circuit samples electric current(I2)And record;
Step c:Second coil of the computation chip from connected current transformer side(B)Input and user load electric current (I1)Reference current in the same direction(I3), then obtain the second tested electric current by sampling circuit samples(I4), the described second tested electricity Stream(I4)Equal to the first tested electric current(I2)Plus auxiliary base electric current(I3a);
Step d:By being calculated reference current(I3)Measurement power for auxiliary reference current(I3a)Equal to the second tested electricity Stream(I4)Subtract the first tested electric current(I2);
Step e:It is auxiliary reference current finally to calculate the measured value of current loop(I3a)Subtract reference current(I3)Afterwards Difference is divided by reference current(I3);Compared so as to judge check results with the accuracy value of corresponding device with this measured value.
CN201710037446.5A 2017-01-19 2017-01-19 A kind of electric energy meter and self checking method of electric energy self checking CN106872928B (en)

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Application Number Priority Date Filing Date Title
CN201710037446.5A CN106872928B (en) 2017-01-19 2017-01-19 A kind of electric energy meter and self checking method of electric energy self checking

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710037446.5A CN106872928B (en) 2017-01-19 2017-01-19 A kind of electric energy meter and self checking method of electric energy self checking

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CN106872928A true CN106872928A (en) 2017-06-20
CN106872928B CN106872928B (en) 2019-04-12

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101162264A (en) * 2006-10-13 2008-04-16 红相电力(上海)有限公司 Watthour meter remote verify monitoring system
CN201184891Y (en) * 2008-01-11 2009-01-21 俞盛荣 Detection module for short/open circuit of current mutual inductor secondary circuit
CN102375136A (en) * 2010-08-18 2012-03-14 深圳市科陆电子科技股份有限公司 System and method for verifying electric energy meter on site
CN103487782A (en) * 2013-07-16 2014-01-01 深圳市航天泰瑞捷电子有限公司 Electric meter calibrating method and automatic calibrating system
CN104360303A (en) * 2014-11-04 2015-02-18 江阴长仪集团有限公司 Method for verifying self-calibration error along with voltage fluctuation on basis of intelligent ammeters
JP2015055610A (en) * 2013-09-13 2015-03-23 日本電気計器検定所 Actual load testing device of watthour meter

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101162264A (en) * 2006-10-13 2008-04-16 红相电力(上海)有限公司 Watthour meter remote verify monitoring system
CN201184891Y (en) * 2008-01-11 2009-01-21 俞盛荣 Detection module for short/open circuit of current mutual inductor secondary circuit
CN102375136A (en) * 2010-08-18 2012-03-14 深圳市科陆电子科技股份有限公司 System and method for verifying electric energy meter on site
CN103487782A (en) * 2013-07-16 2014-01-01 深圳市航天泰瑞捷电子有限公司 Electric meter calibrating method and automatic calibrating system
JP2015055610A (en) * 2013-09-13 2015-03-23 日本電気計器検定所 Actual load testing device of watthour meter
CN104360303A (en) * 2014-11-04 2015-02-18 江阴长仪集团有限公司 Method for verifying self-calibration error along with voltage fluctuation on basis of intelligent ammeters

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