CN102680936A - Simple and convenient autonomic and automatic meter adjustment method - Google Patents

Abstract

The invention relates to a simple and convenient autonomic and automatic meter adjusting method. According to the method, an autonomic and automatic meter adjustment mechanism for an electric meter is used for the meter adjustment, so that the adjustment operation of the electric meter can be performed without a meter adjustment table but only by a power source, and therefore, not only the meter adjustment steps are simplified, but also the cost is reduced; and the method has high meter adjustment precision and high production repeatability, is favorable for production automation, reduces the influence of many human factors on the product quality, ensures the stability and reliability of the product quality, and greatly improves the qualified rate of the product.

Description

A kind of easy autonomous auto-adjustment method

Technical field

The present invention relates to a kind of easy autonomous auto-adjustment method.

Background technology

Electronic electric energy meter just progressively replaces the traditional mechanical electric energy meter because precision is high, starting current is little, the error linearity is good, powerful and easy expansion, anti-electricity-theft ability are strong, can realize series of advantages such as remote monitoring.The calibration operation is an important operation in the electronic electric energy meter production run, has directly influenced the qualification rate of the factory inspection of electronic watch, has also influenced the electronic watch line duration.

Conventional artificial calibration mode; Need to carry out manual calibration with instruments such as electric soldering iron, screwdrivers to ammeter, the use meeting of these instruments produces instrument and damages, and this calibration mode to adjust precision low; The production poor repeatability; Be unfavorable for the production automation, and human factor can impact in a large number, can not guarantee the stability and the reliability of product to product quality.

The existing software meter correcting system needs to cooperatively interact between host computer, ammeter, correction platform, the master meter, and correction platform comprises standard scale and power source, and the price comparison of standard scale is expensive; This makes the ammeter production cost than higher, and the used complex algorithm of prior art software, and complicated operation; Ammeter of every calibration need be provided with primary parameter; The time of palpus labor, efficient is not high

Along with development in science and technology, artificial calibration mode of traditional ammeter and existing software calibration mode can not satisfy requirements of large-scale production, are badly in need of a kind of easy ammeter that has auto-adjustment mechanism of development, to improve product quality and production efficiency.

Summary of the invention

Technical matters to be solved by this invention provides a kind of easy autonomous calibration method automatically that has, and improves product quality and production efficiency.

The technical scheme that the present invention solves the problems of the technologies described above is following: a kind of easy autonomous auto-adjustment method, and the calibration step is following:

Step 1: the external power source of ammeter is provided with magnitude of voltage, current value and the phase value of said power source;

Step 2: after power source is stable, send the calibration order to the ammeter that has autonomous auto-adjustment function;

Step 3: the said ammeter that has autonomous auto-adjustment function carries out passage zeroing adjustment, power, voltage, current correction, phase correction according to the calibration order of receiving.

The invention has the beneficial effects as follows: precision is high, produces good reproducibility, helps the production automation, has reduced the influence of a large amount of human factors to product quality, has guaranteed product and quality of stability and reliability; Ammeter is carried out autonomous adjustment, has broken away from correction platform, only needs a power source can accomplish the calibration associative operation, has simplified the calibration step, reduced cost, and the qualification rate of product improves greatly.

On the basis of technique scheme, the present invention can also do following improvement.

Further, the order of calibration described in the said step 2 comprises: passage zeroing adjustment order, channel gain corrective command, phase correction commands.

Further, the concrete steps of the zeroing of the passage in the said step 3 adjustment are:

A) parameter that said power source is set is a voltage U _n=220V, electric current I=0A;

B) after power source is stablized, to ammeter sendaisle zeroing adjustment order;

D) said ammeter according to order read A, B channel current effective value is made even for 32 times all, the mean value that obtains is write in the channel current effective value offset offset registers, the adjustment passage current effective value;

E) said ammeter reads said passage active power value and averages for 32 times, and 2 bytes are got to mend and obtained active power offset corrected value in the middle of getting after square, this value is write in the passage active power offset correcting register active power of adjustment passage.

Further, the concrete steps of the power in the said step 3, electric current, voltage correction are:

A ') parameter that said power source is set is a voltage U _n=220V, electric current I=I _b, phase place transfers to 1.0;

B ') after power source is stablized, orders to the gain calibration of ammeter sendaisle;

C ') said ammeter carries out the correction of power, voltage, electric current respectively according to the order that receives;

4) capability correction concrete steps:

The said ammeter of a ") reads current power value P _t, according to current power value P _tObtain current real power P _x

The said current real power P of b ") _xWith calibration power U _n* I _bRelatively, calculate error value E rr;

The sharp error value E rr of c ") calculates power gain corrected value GPQA, the power gain corrected value is write in the channel power gain calibration register performance number of adjustment passage;

5) the current correction concrete steps are: said ammeter reads current effective value I _t, introduce the effective value coefficient

Calculate actual current value I _x,

6) the voltage correction concrete steps are: said ammeter reads the current effective value Ut of said ammeter, introduces the effective value coefficient

Calculate actual voltage value U _x,

Further, the concrete steps of the phase correction in the said step 3 are:

C) parameter that said power source is set is a voltage U _n=220V, electric current I=I _b, phase place transfers to 0.5;

D) calculate phase compensation value θ according to formula

; If θ＞0; The computing formula of channel phases corrected value is otherwise;

writes the PHSA that obtains (B) in the channel phases correcting register, the phase value of adjustment passage.

Description of drawings

Fig. 1 is a calibration general flow chart of the present invention;

Fig. 2 is a passage zeroing adjustment process flow diagram of the present invention;

Fig. 3 is a capability correction process flow diagram of the present invention;

Fig. 4 is a current correction process flow diagram of the present invention;

Fig. 5 is a voltage correction process flow diagram of the present invention;

Fig. 6 is a phase correction process flow diagram of the present invention.

Embodiment

Below in conjunction with accompanying drawing principle of the present invention and characteristic are described, institute gives an actual example and only is used to explain the present invention, is not to be used to limit scope of the present invention.

As shown in Figure 1, calibration step of the present invention is following:

1. passage zeroing adjustment, concrete grammar is:

Step 1: the external power source of ammeter, the parameter that said power source is set is a voltage U _n=220V, electric current I=0A;

Step 2: after power source is stable, send the zeroing order to ammeter, ammeter MCU takes orders;

Step 3: computation chip RN8209 reads A in the ammeter, B channel current effective value is made even for 32 times and all obtained average, with the average write current passage effective value register that obtains, according to this value adjustment channel current effective value;

Step 4: said computation chip RN8209 reads useful power and makes even for 32 times all, and 2 bytes are got benefit in the middle of getting after square, and the value that obtains is write active power offset correcting register, according to this value adjustment passage active power value;

2. channel gain is proofreaied and correct, and concrete grammar is:

Step 1: the external power source of ammeter, the parameter that said power source is set is a voltage U _n=220V, electric current I=I _b, phase place transfers to 1.0;

Step 2: after power source was stable, to ammeter sendaisle gain calibration order, ammeter MCU took orders, and carries out power, electric current, voltage correction;

A: capability correction, concrete grammar is:

A) computation chip RN8209 reads current power value P _t, according to formula

Obtain current real power P _x, wherein, calculate record number λ=2 ³²* K * X _h/ 3222000000, K is an ammeter pulse constant, X _hBe the value among the register HFCONST;

B) with said current real power P _xWith calibration power U _n* I _bRelatively, according to formula

Calculate error value E rr;

C) calculate power gain corrected value GPQA (B) according to error value E rr, if error amount is smaller or equal to zero, $\mathrm{GPQA}\left(B\right)=\mathrm{INT}(\frac{\mathrm{Err}}{\mathrm{HErr}}\×2^{15})$ Otherwise, $\mathrm{GPQA}\left(B\right)=\mathrm{INT}(2^{16}+\frac{-\mathrm{Err}}{1+\mathrm{Err}}\×2^{15}),$ The power gain corrected value is write passage A among the said ammeter computation chip RN8209, in the power gain correcting register of B;

B: current correction, concrete grammar is:

A) computation chip RN8209 reads current effective value I _t, calculate current real current value I _xFormula do

R wherein _IsBe copper-manganese resistance, λ _PGABe the gain coefficient of passage, under the situation of current transformer sampling, I _xThe no-load voltage ratio that is multiplied by mutual inductor just can obtain the real current value, has error between the actual value owing to copper-manganese sheet resistance value in the formula and used copper-manganese sheet resistance, so introduce the effective value COEFFICIENT K _IA, revise.Wherein

I _bBe current standard current value, the computing formula of actual current value does

C: voltage correction, method is identical with current correction, introduces the effective value coefficient

Computing formula does $U_x=\frac{U_t}{K_{\mathrm{Iu}}};$

3. phase correction, concrete grammar is:

Step 1: the parameter that said power source is set is a voltage U _n=220V, electric current I=I _b, phase place transfers to 0.5;

Step 2: calculate phase compensation value θ according to formula

; If θ＞0; The computing formula of passage A, B phase correcting value is

otherwise,

writes A, B channel phases correcting register with the PHSA that obtains (B).

Arrive this, the calibration operation is all accomplished.

The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (5)

1. easy autonomous auto-adjustment method, the calibration step is following:

Step 1: the external power source of ammeter is provided with magnitude of voltage, current value and the phase value of said power source;

Step 2: after power source is stable, send the calibration order to the ammeter that has autonomous auto-adjustment function;

Step 3: the said ammeter that has autonomous auto-adjustment function carries out passage zeroing adjustment, power, voltage, current correction, phase correction according to the calibration order of receiving.

2. according to the said easy autonomous auto-adjustment method of claim 1, it is characterized in that the order of calibration described in the said step 2 comprises: passage zeroing adjustment order, channel gain corrective command, phase correction commands.

3. according to the said easy autonomous auto-adjustment method of claim 1, it is characterized in that the concrete steps of the passage zeroing adjustment in the said step 3 are:

A) parameter that said power source is set is a voltage U _n=220V, electric current I=0A;

B) after power source is stablized, to ammeter sendaisle zeroing adjustment order

D) said ammeter according to order read A, B channel current effective value is made even for 32 times all, the mean value that obtains is write in the channel current effective value offset offset registers adjustment channel current effective value;

E) said ammeter reads said passage active power value and averages for 32 times, and 2 bytes are got to mend and obtained active power offset corrected value in the middle of getting after square, this value is write in the passage active power offset correcting register adjustment passage active power value.

4. according to the said easy autonomous auto-adjustment method of claim 1, it is characterized in that the concrete steps of the power in the said step 3, electric current, voltage correction are:

A ') parameter that said power source is set is a voltage U _n=220V, electric current I=I _b, phase place transfers to 1.0;

B ') after power source is stablized, orders to the gain calibration of ammeter sendaisle;

C ') said ammeter carries out the correction of power, electric current, voltage respectively according to the order that receives;

1) capability correction concrete steps:

The said ammeter of a ") reads current power value P _t, according to current power value P _tObtain current real power P _x

The said current real power P of b ") _xWith calibration power U _n* I _bRelatively, calculate error value E rr;

The sharp error value E rr of c ") calculates power gain corrected value GPQA, the power gain corrected value is write in the channel power gain calibration register performance number of adjustment passage.

2) the current correction concrete steps are: said ammeter reads current effective value I _t, introduce the effective value coefficient Calculate actual current value I _x,

3) the voltage correction concrete steps are: said ammeter reads the current effective value U of said ammeter _t, introduce the effective value coefficient

Calculate actual voltage value U _x,

5. easy autonomous auto-adjustment method according to claim 1 is characterized in that the concrete steps of the phase correction in the said step 3 are:

A) parameter that said power source is set is a voltage U _n=220V, electric current I=I _b, phase place transfers to 0.5;

B) calculate phase compensation value θ according to formula ; If θ＞0; The computing formula of channel phases corrected value is

otherwise;

writes the PHSA that obtains (B) in the channel phases correcting register, the phase value of adjustment passage.

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