CN102680936B - A kind of easy autonomous auto-adjustment method - Google Patents

Abstract

The present invention relates to a kind of easy autonomous auto-adjustment method.The method utilizes the autonomous auto-adjustment mechanism of the one in ammeter to carry out calibration, so the check and correction operation of ammeter can depart from correction platform, only need a power source to complete calibration, this has not only simplified calibration step, and reduces cost, and the method calibration precision is high, produce reproducible, be conducive to the production automation, decrease the impact of a large amount of human factor on product quality, ensure that stability and the reliability of product quality, the qualification rate of product greatly improves.

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, because precision is high, starting current is little, error linear degree is good, powerful and easily expansion, anti-electricity-theft ability are strong, can realize the series of advantages such as remote monitoring, just progressively replaces traditional mechanical power energy meter.Calibration operation is the important operation of in electronic electric energy meter production run, directly affects the qualification rate of the factory inspection of electronic watch, also have impact on electronic watch line duration.

Traditional artificial calibration mode, manual calibration need be carried out to ammeter with the instrument such as electric soldering iron, screwdriver, the use of these instruments can produce instrument damages, and this calibration mode Adjustment precision is low, production poor repeatability, be unfavorable for the production automation, and a large amount of human factor can impact to product quality, can not ensure stability and the reliability of product.

Existing software regulating meter system needs to cooperatively interact between host computer, ammeter, correction platform, master meter, correction platform comprises standard scale and power source, the price comparison of standard scale is expensive, this makes ammeter production cost higher, and prior art software algorithm used is complicated, and complicated operation, often calibrate an ammeter to need to arrange primary parameter, the time of palpus at substantial, efficiency is not high

Along with development in science and technology, traditional ammeter artificial calibration mode and existing software regulating meter mode can not meet the needs of production in enormous quantities, are badly in need of a kind of easy ammeter with auto-adjustment mechanism of development, to improve product quality and production efficiency.

Summary of the invention

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

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

Step 1: the external power source of ammeter, arranges the magnitude of voltage of described power source, current value and phase value;

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

Step 3: the described ammeter with autonomous auto-adjustment function carries out passage zeroing adjustment according to the calibration order received, power, voltage, current correction, phase correction.

The invention has the beneficial effects as follows: precision is high, produce reproducible, be conducive to the production automation, decrease the impact of a large amount of human factor on product quality, ensure that stability and the reliability of product and quality; Autonomous adjustment carried out by ammeter, departed from correction platform, only needs a power source can complete calibration associative operation, simplified calibration step, reduced cost, and the qualification rate of product greatly improves.

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

Further, described in described step 2, calibration order comprises: passage adjusts zero justification command, sensor gains calibration order, phase correction commands.

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

A) parameter arranging described power source is voltage U _n=220V, electric current I=0A;

B), after power source is stablized, zero justification command is adjusted to ammeter sendaisle;

D) described ammeter is averaged for 32 times according to order reading A, channel B current effective value, is write by the mean value obtained in channel current effective value offset offset registers, the current effective value of adjustment passage;

E) described ammeter reads described passage active power and is worth 32 times and averages, and gets middle 2 bytes and get benefit and obtain active power offset corrected value after square, by this value write passage active power offset correcting register, and the active power of adjustment passage.

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

A ') parameter that arranges described power source is voltage U _n=220V, electric current I=I _b, phase place is adjusted to 1.0;

B ') after power source is stable, to ammeter sendaisle gain calibration order;

C ') described ammeter carries out the correction of power, voltage, electric current respectively according to the order received;

4) capability correction concrete steps:

The described ammeter of a ") reads current power value P _t, according to current power value P _tobtain current real power P _x;

The described current real power P of b ") _xwith calibration power U _n* I _brelatively, error value E rr is calculated;

C ") sharp error value E rr calculates power gain corrected value GPQA, by power gain corrected value write channel power gain calibration register, and the performance number of adjustment passage;

5) current correction concrete steps are: described ammeter reads current effective value I _t, introduce effective value coefficient calculate actual current value I _x,

6) voltage correction concrete steps are: described ammeter reads the current effective value Ut of described ammeter, introduce effective value coefficient calculate actual voltage value U _x,

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

C) parameter arranging described power source is voltage U _n=220V, electric current I=I _b, phase place is adjusted to 0.5;

D) according to formula calculate phase compensation value θ, if θ > 0, the computing formula of channel phases corrected value is otherwise, the PHSA obtained (B) is write in channel phases correcting register, the phase value of adjustment passage.

Accompanying drawing explanation

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

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

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

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

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

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

Embodiment

Be described principle of the present invention and feature below in conjunction with accompanying drawing, example, only for explaining the present invention, is not intended to limit scope of the present invention.

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

1. passage zeroing adjustment, concrete grammar is:

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

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

Step 3: in ammeter, computation chip RN8209 reading A, channel B current effective value are averaged for 32 times and obtain average, by the average reset current passage effective value register obtained, according to this value adjustment channel current effective value;

Step 4: described computation chip RN8209 reads useful power and is averaged for 32 times, gets middle 2 bytes and get benefit after square, by the value write active power offset correcting register obtained, according to this value adjustment passage active power value;

2. sensor gains calibration, concrete grammar is:

Step 1: the external power source of ammeter, the parameter arranging described power source is voltage U _n=220V, electric current I=I _b, phase place is adjusted to 1.0;

Step 2: after power source is stable, to ammeter sendaisle gain calibration order, ammeter MCU takes orders, and performs 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 ammeter meter constant, X _hfor the value in register HFCONST;

B) by described current real power P _xwith calibration power U _n* I _brelatively, according to formula calculate error value E rr;

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

B: current correction, concrete grammar is:

A) computation chip RN8209 reads current effective value I _t, calculate current real current value I _xformula be wherein R _iscopper-manganese resistance, λ _pGAthe gain coefficient of passage, when current transformer samples, I _xthe no-load voltage ratio being multiplied by mutual inductor just can obtain real current value, there is error due to copper-manganese sheet resistance values in formula and between the actual value of copper-manganese sheet resistance used, so introduce effective value COEFFICIENT K _iA, revise.Wherein i _bfor Current standards current value, the computing formula of actual current value is

C: voltage correction, method is identical with current correction, introduces effective value coefficient computing formula is $U_x=\frac{U_t}{K_{\mathrm{iu}}};$

3. phase correction, concrete grammar is:

Step 1: the parameter arranging described power source is voltage U _n=220V, electric current I=I _b, phase place is adjusted to 0.5;

Step 2: according to formula calculate phase compensation value θ, if θ > 0, the computing formula of passage A, B phase correcting value is otherwise, the PHSA obtained (B) is write A, channel B phase correction register.

Arrive this, calibration operation all completes.

The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (4)

1. an easy autonomous auto-adjustment method, calibration step is as follows:

Step 1: the external power source of ammeter, arranges the magnitude of voltage of described power source, current value and phase value;

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

Step 3: the described ammeter with autonomous auto-adjustment function carries out passage zeroing adjustment according to the calibration order received, power, voltage, current correction, phase correction;

The concrete steps of the power in described step 3, electric current, voltage correction are:

A ') parameter that arranges described power source is voltage U _n=220V, electric current I=I _b, wherein I _bfor Current standards current value, phase place is adjusted to 1.0;

B ') after power source is stable, to ammeter sendaisle gain calibration order;

C ') described ammeter carries out the correction of power, electric current, voltage respectively according to the order received;

1) capability correction concrete steps:

A ") described ammeter reading current power value P _t, according to current power value P _tobtain current real power P _x; According to formula obtain current real power P _x, wherein, calculate record number λ=2 ³²× K × X _h/ 3222000000, K is ammeter meter constant, X _hfor the value in register HFCONST;

B ") described current real power P _xwith calibration power U _n* I _brelatively, error value E rr is calculated; By described current real power P _xwith calibration power U _n* I _brelatively, according to formula calculate error value E rr;

C ") utilize error value E rr to calculate power gain corrected value GPQA, if error amount is less than or equal to zero, $GPQA=INT(\frac{Err}{HErr}\×2^{15})$ Otherwise, $GPQA=INT(2^{16}+\frac{-Err}{1+Err}\×2^{15}),$ By in power gain corrected value write channel power gain calibration register, the performance number of adjustment passage;

2) current correction concrete steps are: described ammeter reads current effective value I _t,

Introduce effective value coefficient calculate actual current value I _x,

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

Introduce effective value coefficient calculate actual voltage value U _x,

2. autonomous auto-adjustment method easy according to claim 1, is characterized in that, calibration order described in described step 2 comprises: passage adjusts zero justification command, sensor gains calibration order, phase correction commands.

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

A) parameter arranging described power source is voltage U _n=220V, electric current I=0A;

B), after power source is stablized, zero justification command is adjusted to ammeter sendaisle;

D) described ammeter is averaged for 32 times according to order reading A, channel B current effective value, by the average reset current passage effective value register obtained, according to this value adjustment channel current effective value;

E) described ammeter reads described passage active power and is worth 32 times and averages, and gets middle 2 bytes and gets benefit, by the value write active power offset correcting register obtained, according to this value adjustment passage active power value after square.

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

A) parameter arranging described power source is voltage U _n=220V, electric current I=I _b, phase place is adjusted to 0.5;

B) according to formula calculate phase compensation value θ, if θ > 0, the computing formula of channel phases corrected value is $\mathrm{PHSA}\left(B\right)=\mathrm{INT}\left(\frac{\mathrm{\θ}}{0.020}\right),$ Otherwise, the PHSA obtained (B) is write in channel phases correcting register, the phase value of adjustment passage.