CN102590783A - Method for detecting error of indication of electric energy of high voltage energy meter and assessing qualification - Google Patents

Abstract

The invention discloses a method for detecting the error of indication of the electric energy of a high voltage energy meter and assessing qualification, which is convenient for operators to judge whether electric energy metering of the high voltage energy meter is qualified or not so as to improve the detection accuracy. The method comprises the steps of: properly selecting electric energy of certain value according to actual parameters of the detected high voltage energy meter; and controlling the output of a detection device by a standard electric energy meter. When the output of the detection device reaches the electric energy of certain value, the electric energy output by the detection device stops automatically, and the accumulated electric energy of the detected high voltage energy meter is automatically read. The error of indication of the electric energy of the high voltage energy meter is calculated by using a formula (1), wherein in the formula, GammaD is determined system error percentage of the detection device of the high voltage energy meter and is equal to 0 when revision is not required; DB is standard electric energy value output by the detection device of the high voltage energy meter, and is expressed by kWh or MWh; and Dx is electric energy indication of the detected high voltage energy meter, and is expressed by kWh or MWh. The error of indication Gamma is subjected to qualification evaluation according to expanded uncertainty U which is equal to kuc, so that the accuracy of result judgment is guaranteed.

Description

A kind of check high-voltage electric energy meter electric flux error of indication and conformity assessment method

Technical field

The present invention relates to a kind of check high-voltage electric energy meter electric flux error of indication and conformity assessment method, belong to field of measuring techniques.

Background technology

High-voltage electric energy meter is being represented the technological development direction in following power distribution network high pressure measurement field, is the far reaching property changed technological achievement.Compare with the conventional high-tension metering system; High-voltage electric energy meter has reduced the resource consumption of copper, iron, insulating material; Energy consumption reduces more than 80%, has avoided low-pressure side to be prone to the generation of problems such as stealing and ferroresonance from structure, is typical energy-saving and cost-reducing and green technology achievement.

Electric energy meter belongs to legal measurement instrument, is used for the metering of electric energy between electric power enterprise, power supply enterprise and the user, and according to the requirement of national metrological regulation, measurement instrument must be tested before putting into operation, to guarantee safe operation and accurately metering.High-voltage electric energy meter belongs to novel measuring products, and country does not have relevant rules to stipulate its method of inspection at present.

Summary of the invention

The purpose of this method is to verify problem in order to solve high-voltage electric energy meter electric flux quantitative testing; Provide a kind of succinct, directly perceived; Whether qualified the handled easily personnel differentiate high-voltage electric energy meter electrical energy metering the check high-voltage electric energy meter electric flux error of indication and conformity assessment method, to improve the checkability of high-voltage electric energy meter.

For realizing above-mentioned purpose, the present invention adopts following technical scheme:

A kind of check high-voltage electric energy meter electric flux error of indication and conformity assessment method; According to the actual parameter of the high-voltage electric energy meter that is verified, suitably choose the electric energy value of certain value, promptly according to the output quantity of standard electric energy meter control test device; When verifying attachment output reaches this electric flux; The electric energy of verifying attachment output stops automatically, reads the accumulative total electric flux of seized high-voltage electric energy meter automatically, utilizes formula (1) to calculate the error of indication of seized high-voltage electric energy meter accumulative total electric flux:

$\mathrm{\γ}=\frac{\mathrm{Dx}-D_B}{D_B}\×100+{\mathrm{\γ}}_D---\left(1\right)$

In the formula: γ _D---the fixed system error % of high-voltage electric energy meter verifying attachment, γ in the time of need not revising _D=0

D _B---the standard electric energy value of high-voltage electric energy meter verifying attachment output, kWh or MWh;

D _x---seized high-voltage electric energy meter point energy indicating value, kWh or MWh.

Utilize the consistance of the degree of reliability and the transmission of quantity value of the resulting error of indication of this method to depend on the size of its uncertainty; And uncertain source mainly contains in checkout procedure: the uncertain component that the error of high-voltage electric energy meter calibrating installation causes, and this uncertainty contributor component source is in the limits of error of high-voltage electric energy meter standard set-up; The whole uncertainty component that produces of seized high voltage electric energy Watch Errorization; The uncertainty component that seized high-voltage electric energy meter and standard set-up measuring repeatability cause; Each uncertainty component is uncorrelated, and combined standard uncertainty measures by formula (2):

(2)

In the formula: c _i=1, seized epiphase is 1 to the sensitivity coefficient of the uncertainty component that the error information revision of the convention produces;

U (x ₁)---the uncertain component that the error of high-voltage electric energy meter calibrating installation causes;

U (x ₂)---the whole uncertainty component that produces of seized high voltage electric energy Watch Errorization;

U (x ₃)---the uncertainty component that seized high-voltage electric energy meter and standard set-up measuring repeatability cause.

Get and comprise factor k=2, thus the formula of obtaining (3) expanded uncertainty U=ku _c(3)

The expanded uncertainty U that asks according to formula (3) to publicity (1) ask error of indication γ carry out qualification determination, when the error of indication is qualified, should satisfy formula (4)

|γ|+U≤MPEV (4)

In the formula: MPEV---limits of error absolute value

Wherein, During as

, then | γ | it is qualified that≤MPEV can be judged to.

The effect of the inventive method is: 1. this high-voltage electric energy meter verifying attachment has been realized the indicating value accuracy through the quantitative method check high-voltage electric energy meter register record of verifying of electric flux first.2. through analysis, improved the accuracy of the assay judgement of high-voltage electric energy meter, application prospect has preferably been arranged checkout procedure middle part degree of certainty.

Embodiment

Below in conjunction with embodiment the present invention is further specified.

Service test device configuration high pressure normal voltage summation current transformer of the present invention, standard electric energy meter; Employing standard electric energy sizing technique test is promptly according to actual parameter (Un=10kV, the Imax=600A of the high-voltage electric energy meter that is verified; Meritorious energy pulse constant: 800imp/MWh; A three-way three-phase high-voltage electric energy table of active electric energy meter accuracy 0.5S level), suitably choose 10MWh, by the output quantity of standard electric energy meter control test device; When device output reaches 10MWh; The electric energy of device output stops automatically, reads the register accumulative total electric flux (kWh or MWh) of seized high-voltage electric energy meter automatically, utilizes formula (1) to calculate the error of indication of seized high-voltage electric energy meter register accumulative total electric flux:

$\mathrm{\γ}=\frac{\mathrm{Dx}-D_B}{D_B}\×100+{\mathrm{\γ}}_D---\left(1\right)$

Seized high-voltage electric energy meter is at Un=10kV; Imax=600A; Repeat independent measurement 5 times under

condition; Obtain the electric flux error of indication of each time respectively, as shown in the table.

The electric flux error of indication unit that records for 5 times: %

Then corresponding standard deviation estimated value S=0.007071%, the uncertainty component u (x that seized high-voltage electric energy meter and standard set-up measuring repeatability cause ₃)=0.002357%

The uncertain component that the error of high-voltage electric energy meter calibrating installation causes; This uncertainty contributor component source is in the limits of error of electric energy meter standard set-up; Examine and determine seized electric energy meter with 0.1 grade of electric energy meter calibrating apparatus; Be that the absolute value of 1.0 any load lower device error is not thought and can be surpassed 0.1 in phase place, promptly the half-breadth between the dispersion area is 0.1, can think Normal Distribution (k=3) in this interval.

Because the uncertainty component that the data revision of the convention produces; Seized high-voltage electric energy meter is 0.5 grade; Its change is whole to be spaced apart 0.05%; Promptly changing whole introducing quantization error is 0.025%, distributes

this interval obedience evenly

Thereby obtain at Un=10kV; Imax=600A, each standard uncertainty summary sheet when

The combined standard uncertainty that calculates

Get and comprise factor k=2, thereby be expanded uncertainty U=ku _c=0.0728%, and this seized high-voltage electric energy meter exists

The time limits of error absolute value MPEV=0.5, so the time

And the absolute value of each time electric flux error of indication | γ |≤MPEV, so can think that the electric flux error of indication of this seized high-voltage electric energy meter is qualified.

Claims (2)

1. check the high-voltage electric energy meter electric flux error of indication and conformity assessment method for one kind, it is characterized in that, according to the actual parameter of the high-voltage electric energy meter that is verified; The electric flux of suitably choosing certain value is; By the output quantity of standard electric energy meter control test device, when verifying attachment output reached this electric flux of choosing, the electric energy of verifying attachment output stopped automatically; Automatically read the accumulative total electric flux of seized high-voltage electric energy meter, utilize formula (1) to calculate the error of indication of seized high-voltage electric energy meter accumulative total electric flux:

$\mathrm{\γ}=\frac{\mathrm{Dx}-D_B}{D_B}\×100+{\mathrm{\γ}}_D---\left(1\right)$

In the formula: γ _D---the fixed system error % of high-voltage electric energy meter verifying attachment, γ in the time of need not revising _D=0

D _B---the standard electric energy value of high-voltage electric energy meter verifying attachment output, kWh or MWh;

D _x---seized high-voltage electric energy meter point energy indicating value, kWh or MWh.

2. the check high-voltage electric energy meter electric flux error of indication as claimed in claim 1 and conformity assessment method; It is characterized in that; The consistance of calculating the degree of reliability and the transmission of quantity value of the resulting error of indication depends on the size of its uncertainty; And uncertain source mainly contains in checkout procedure: the uncertain component that the error of high-voltage electric energy meter calibrating installation causes, and this uncertainty contributor component source is in the limits of error of high-voltage electric energy meter standard set-up; The whole uncertainty component that produces of seized high voltage electric energy Watch Errorization; The uncertainty component that seized high-voltage electric energy meter and standard set-up measuring repeatability cause, each uncertainty component is uncorrelated, and combined standard uncertainty measures by formula (2): $u_c=\sqrt{\mathrm{\Σ}{c}_i^2{u}^2\left(x_i\right)}---\left(2\right)$

In the formula: c _i=1, seized epiphase is 1 to the sensitivity coefficient of the uncertainty component that the error information revision of the convention produces;

U (x ₁)---the uncertain component that the error of high-voltage electric energy meter calibrating installation causes;

U (x ₂)---the whole uncertainty component that produces of seized high voltage electric energy Watch Errorization;

U (x ₃)---the uncertainty component that seized high-voltage electric energy meter and standard set-up measuring repeatability cause;

Get and comprise factor k=2, thus the formula of obtaining (3) expanded uncertainty U=ku _c(3)

The expanded uncertainty U that asks according to formula (3) to publicity (1) ask error of indication γ carry out qualification determination, when the error of indication is qualified, should satisfy formula (4)

|γ|+U≤MPEV (4)

In the formula: MPEV---limits of error absolute value

Wherein, During as , then | γ | it is qualified that≤MPEV promptly is judged to.