CN102608559B - Method for collecting electric energy errors of electric energy meter and device thereof - Google Patents
Method for collecting electric energy errors of electric energy meter and device thereof Download PDFInfo
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Abstract
The invention relates to the field of electric energy metering, and discloses a method for collecting electric energy errors of an electric energy meter and a device thereof. In the invention, in a reactive load environment, the electric energy meter is collected by using high-accuracy and universal power values; and compared with the traditional pulse correction method, the correction requirements are reduced, the calibration process is simplified, the advantages of quickness, accuracy and convenience are highlighted, and an effect of carrying out single-point correction on the errors of the electric energy meter is achieved. If a phase angle is too big or too small, a situation that the value of a sine or cosine thereof is too big or too small is caused, therefore, the calculation accuracy can not be ensured. Through taking power values as data sources rather than direct and low-accuracy angles or derived parameters (such as power factors and the like) as data sources, a situation that the principle error of correction is low enough can be ensured. Through verification, the accuracy of correction on the electric energy meter can be further ensured. The testing time is only one third of the original testing time, thereby greatly saving the total collection time.
Description
Technical field
The present invention relates to electric energy metrical field, particularly a kind of technology of correcting electric energy meter electric energy error.
Background technology
Along with the energetically support of country to intelligent grid, the market demand of electronic electric energy meter also constantly expands in recent years.This elementary cell of electric energy metrical must be therein, and in enormous quantities, cheaply in electric energy meter production industry, cost is crucial factor, be mainly reflected on correction time and proofread and correct cost, if can use rational technical improvement method, reduce and proofread and correct T.T., certainly will optimize correction cost, improve the competitiveness of product in market.
Electric energy meter is to be assembled by multiple discrete parts, certainly exists certain discreteness, also will produce error, thereby needs calibration link to ensure individual consistance while production.The correction of electric energy meter provides reference input (as voltage 220V/ electric current 5A) by standard source mostly, compares calibration by being corrected the correction pulse of electric energy meter output and the pulse of standard scale.The error of proofreading and correct due to needs comprises gain error and phase error, conventionally adopts classical two point correction method, and first is that now electric current and voltage same-phase is proofreaied and correct under 1.0R loading condition in 100%lb POL corrected power gain error; Second point is in 100%lb POL corrected power phase error, and now voltage leading current 60 is spent, and under 0.5L loading condition, proofreaies and correct.Here, lb refers to reference current, different ammeter reference current differences.1.0R refers to that load is pure resistance, and now power factor is that 1.0,0.5L is that inductive load and voltage leading current 60 are spent, and now power factor is 0.5.
Above-mentioned two traditional point calibrations, need standard source to drive twice, and these parts need the rise time, if the situation of three-phase, more will increase more than driving standard source to six time, and testing procedure is loaded down with trivial details, and correction time is also longer.
Therefore, in the prior art, need badly and a kind ofly can disposablely complete single-phase or heterogeneous gain and phase correction, reduce aligning step, save correction time, and then reduce the single point correction technology of the production cost of electric energy meter manufacturer.
Summary of the invention
The object of the present invention is to provide a kind of method and device thereof of correcting electric energy meter electric energy error, reduce alignment requirements and also simplify trimming process, highlighted fast and accurate advantage easily again, realized single point correction electric energy meter error.
For solving the problems of the technologies described above, embodiments of the present invention disclose a kind of method of correcting electric energy meter electric energy error, comprise the following steps:
Be input in standard scale and electric energy meter to be corrected by voltage signal with through the current signal of predetermined phase angle phase shift simultaneously;
Read the first active power and first reactive power of standard scale output;
Read the second active power and second reactive power of electric energy meter output to be corrected;
Using the product of the first active power and the second reactive power as the first product;
Using the product of the second active power and the first reactive power as the second product;
Using the product of the first active power and the second active power as the 3rd product;
Using the product of the first reactive power and the second reactive power as the 4th product;
Using the product of the first active power and the first active power as the 5th product;
Using the product of the first reactive power and the first reactive power as the 6th product;
By the difference of the first product and the second product divided by the 3rd product and the 4th product and, the business of gained is as the phase angle of phase error of energy meter to be corrected;
By the 3rd product and the 4th product and divided by the 5th product and the 6th product and, the business of gained, again divided by constant coefficient C, obtains the size of electric energy meter gain error to be corrected;
The size of the phase angle of phase error and gain error is write respectively in the phase correction register and gain calibration register of electric energy meter to be corrected.
Embodiments of the present invention also disclose a kind of device of correcting electric energy meter electric energy error, comprising:
The first phase-shift unit, for carrying out current signal the phase shift of predetermined phase angle;
Input block, for being input to standard scale and electric energy meter to be corrected by the current signal of voltage signal and the output of the first phase-shift unit;
Power reading unit, for reading the first active power and first reactive power of standard scale output, reads the second active power and second reactive power of electric energy meter output to be corrected;
The first multiplier, for the first active power and the second reactive power are multiplied each other, product is as the first product;
The second multiplier, for the second active power and the first reactive power are multiplied each other, product is as the second product;
The 3rd multiplier, for the first active power and the second active power are multiplied each other, product is as the 3rd product;
The 4th multiplier, for the first reactive power and the second reactive power are multiplied each other, product is as the 4th product;
The 5th multiplier, for the first active power and the first active power are multiplied each other, product is as the 5th product;
The 6th multiplier, for the first reactive power and the first reactive power are multiplied each other, product is as the 6th product;
Subtracter, for subtracting each other the second product of the first product of the first multiplier output and the output of the second multiplier;
First adder, for being added the 4th product of the 3rd product of the 3rd multiplier output and the output of the 4th multiplier;
The first divider, for the result divided by first adder output by the result of subtracter output, the business of gained is as the phase angle of phase error of energy meter to be corrected;
Second adder, for being added the 6th product of the 5th product of the 5th multiplier output and the output of the 6th multiplier;
The second divider, for the result divided by second adder output by the result of first adder output, the business of gained, again divided by constant coefficient C, obtains the size of electric energy meter gain error to be corrected;
Writing unit, for writing the result of the result of the first divider output and the output of the second divider respectively phase correction register and the gain calibration register of electric energy meter to be corrected.
Compared with prior art, the key distinction and effect thereof are embodiment of the present invention:
Under reactive load environment, adopt the higher and general performance number of accuracy to carry out correcting electric energy meter, more traditional impulse correction method, reduces alignment requirements and simplifies trimming process, highlight fast and accurate advantage easily again, realized single point correction electric energy meter error.
Further, if phase angle is too large or too little, can cause the value of its sine or cosine too large or too little, cannot ensure computational accuracy.
Further, the data source that bearing calibration of the present invention adopts, is the higher and general performance number of accuracy, but not directly but the not high angle of precision or derived parameter (as power factor etc.) can ensure that the errors of principles of the method is enough low.
Further, by checking, can further guarantee the order of accuarcy that electric energy meter is proofreaied and correct.
Further, the test duration is only original 1/3, has greatly saved correction T.T..
Brief description of the drawings
Fig. 1 is the schematic flow sheet of a kind of method of correcting electric energy meter electric energy error in first embodiment of the invention;
Fig. 2 is the schematic flow sheet of the numerical procedure of a kind of active-power P and reactive power Q in first embodiment of the invention;
Fig. 3 be in first embodiment of the invention in a kind of capability correction method and prior art the result of common method phase calibration relatively schematic diagram is (wherein, what 10 lines represented is capability correction method of the present invention, and what 20 lines represented is common method of the prior art);
Fig. 4 is the structural representation of a kind of device of correcting electric energy meter electric energy error in second embodiment of the invention.
Embodiment
In the following description, in order to make reader understand the application better, many ins and outs have been proposed.But, persons of ordinary skill in the art may appreciate that even without these ins and outs and the many variations based on following embodiment and amendment, also can realize the each claim of the application technical scheme required for protection.
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, embodiments of the present invention are described in further detail.
First embodiment of the invention relates to a kind of method of correcting electric energy meter electric energy error.Fig. 1 is the schematic flow sheet of the method for this correcting electric energy meter electric energy error.
Specifically, as shown in Figure 1, the method for this correcting electric energy meter electric energy error comprises the following steps:
In step 101, be input in standard scale and electric energy meter to be corrected by voltage signal with through the current signal of predetermined phase angle phase shift simultaneously.
Here, the order of magnitude of predetermined phase angle is between 20 degree to 70 degree.
If phase angle is too large or too little, can cause the value of its sine or cosine too large or too little, cannot ensure computational accuracy.
In addition, be appreciated that in the present invention, phase angle not must be accurately 60 degree, only need stable larger acute angle.As long as guarantee active power and reactive power are simultaneously non-vanishing, get positive and negative 30 degree to 60 degree scopes from practical term suggestion in theory, require 20 ° of < of power angle | φ | 70 ° of <.Can certainly be less or larger than 70 degree than 20 degree, just effect can be weaker.
After this enter step 102, read the first active power and first reactive power of standard scale output.
After this enter step 103, read the second active power and second reactive power of electric energy meter output to be corrected.
The calculation procedure of the first active power and the second active power is:
Multiply each other by voltage signal with through the current signal of predetermined phase angle phase shift, the gained signal that multiplies each other is by low-pass filtering, and after filtering, multiple spot is averaged again, obtains the first active power or the second active power.
The calculation procedure of the first reactive power and the second reactive power is:
First by voltage signal through 90 degree phase shifts, the later voltage signal of phase shift with multiply each other through the current signal of predetermined phase angle phase shift, the gained signal that multiplies each other is by low-pass filtering, after filtering, multiple spot is averaged again, obtains the first reactive power or the second reactive power.
First, the power calculation principle of lower basic active-power P and reactive power Q is described.U (t) and i (t) represent the voltage and current of electrical network reality, are obtaining digital signal through analog to digital converter ADC sample quantization, and this signal is the sine wave taking power frequency (China is as 50Hz) as the cycle in itself.As shown in Figure 2, u (t) and i (t) signal multiplication, low-pass filtering, multiple spot obtain active power after being averaged, the power consumption speed of respective user in amplitude.Especially, voltage u (t) is after 90 degree phase shift links of numeral, and the voltage uh (t) of its output produces 1/4 cycle in phase place to postpone, and cosine wave (CW) is changed to sine wave signal, conveniently realizes the calculating of reactive power and electric energy.
uh(t)＝ku*cos[ωt-(pi/2)]＝ku*sin(ωt)
Here ku, ki correspondence the gain on signal transmission path, and ω represents pulsation,
represent the initial phase of electric current, rated output:
For simplicity, note k=ku*ki/2, filtering and average after:
Active power
In like manner, q (t)=uh (t) * i (t),
Can release reactive power
Obviously, here simplification of coefficient k=ku*ki/2.
The data source that bearing calibration of the present invention adopts, is the higher and general performance number of accuracy, but not directly but the not high angle of precision or derived parameter (as power factor etc.) can ensure that the errors of principles of the method is enough low.
After this enter step 104, calculate the phase angle of phase error of energy meter to be corrected.
Using the product of the first active power and the second reactive power as the first product.
Using the product of the second active power and the first reactive power as the second product.
Using the product of the first active power and the second active power as the 3rd product.
Using the product of the first reactive power and the second reactive power as the 4th product.
Using the product of the first active power and the first active power as the 5th product.
Using the product of the first reactive power and the first reactive power as the 6th product.
By the difference of the first product and the second product divided by the 3rd product and the 4th product and, the business of gained is as the phase angle of phase error of energy meter to be corrected.
Describe the Computing Principle of phase error below, in detail.
In the time carrying out single point correction, need to select reactive load environment (as 220V/5A/0.5L point), standard board is through arranging reference voltage and the reference current of output.The output of standard board is connected with port by cable, sends into standard scale on the one hand, and standard scale provides power angle φ, the active-power P of the actual output of board
iand reactive power Q
inumerical value, the applied power of note input
obviously meet and be related to P
i=S
i* cos (φ) ' Q
i=S
i* sin (φ); Send on the other hand electric energy meter to be corrected, due to current transformer (Current Transformer, be called for short " CT "), voltage transformer (VT) (Potential Transformer, be called for short " PT ") etc. the impact of sensor, and the impact of capacitance-resistance and signal processing, extra phase shift component is introduced in capital, the phase differential that makes actual input computation chip is Φ, we establish the total voltage current phase error delta (being conventionally not more than 2 degree) that this electric energy meter is introduced through input signal bang path, obviously meet Φ=φ+Δ.In addition, the computation chip in electric energy meter to be corrected, through the internal algorithm shown in Fig. 2 above, in corresponding registers, also can provide active power calculating value P
cwith reactive power calculating value Q
c.Although be entered as proportional relation with outside, owing to having gain error and scale-up factor, unification represents by COEFFICIENT K, for active power, meets K*P
c=S
i* cos (Φ), simultaneously for reactive power, meets K*Q
c=S
i* sin (Φ).
We know, the smooth curve of arbitrary continuation all exists its Taylor expansion, and function f (x) is at x=x
0near first order Taylor is f (x)=f (x
0)+f ' (x
0) * (x-x
0)+O (x-x
0)
2.Here ignore its component more than second order, apply it on the cosine function of unlimited smooth property, cos (Φ) is launched near Φ=φ, so there is cos (Φ) ≈ cos (φ)+[sin (φ)] * (Φ-φ), formula both sides are with taking advantage of S
i, obtain S
i* cos (Φ)=S
i* cos (φ)-S
i* sin (φ) * (Φ-φ), brings some relations of deriving into above, after abbreviation, can obtain K*P
c=P
i-Q
i* Δ.For process like reactive power application class, obtain equally simple relational expression, K*Q
c=Q
i+ P
i* Δ.The duality relation formula of these two power, ratio elimination factor K is in both sides, can solve phase error angle Δ=(P
i* Q
c-P
c* Q
i)/(P
i* P
c+ Q
i* Q
c), inserted the phase correction register in electric energy meter to be corrected.So far, the phase correction work of electric energy meter has completed.
Capability correction method is obtained to the actual effect of phase error, on Matlab digital platform, carry out emulation.Under 0.5L loading condition, get near the scopes of positive and negative 2 degree 60 degree, investigate and calculate to obtain the percentage error situation of phase differential, see in Fig. 3 shown in 10 lines, owing to only having got once being similar to of Taylor expansion, so graph of errors belongs to class parabolic type.20 lines in Fig. 3 represent the result of common method, relatively in, can be clear that the significantly improvement effect of capability correction method.
After this enter step 105, calculate the size of electric energy meter gain error to be corrected.
By the 3rd product and the 4th product and divided by the 5th product and the 6th product and, the business of gained, again divided by constant coefficient C, obtains the size of electric energy meter gain error to be corrected.
The ingenious part of above-mentioned power phases correction method, is also to complete easily the correction to gain error.Δ is taken back and can be solved COEFFICIENT K, K=(P
i* P
c+ Q
i* Q
c)/(P
i* P
i+ Q
i* Q
i).Set forth above, COEFFICIENT K represents that this treats school electric energy meter gain error and scale-up factor, has in fact comprised the full detail of gain error.For gain error, illustrate as an example of typical mode instantly example,, by the correction link of (1+Pg), Pg is gain calibration register value here, | Pg| < 1.For scale-up factor, specific to specific computation chip, this value is generally constant coefficient C, so there is K=(1+Pg) * C.Can obtain so Pg, Pg=(P
i* P
c+ Q
i* Q
c)/(P
i* P
i+ Q
o* Q
i)/C-1, is inserted gain calibration register.So, the gain calibration work of electric energy meter has also completed.Can be from whole removing, above-mentioned main derivation relation following (note: in this civilian formula, angle is all in radian):
After this enter step 106, the size of the phase angle of phase error and gain error is write respectively in the phase correction register and gain calibration register of electric energy meter to be corrected.
In addition, further comprising the steps of:
Be input in corrected electric energy meter by current signal with through the voltage signal of predetermined phase angle phase shift, observe the error of output pulse, the order of accuarcy of the corrected electric energy meter of checking.
By checking, can further guarantee the order of accuarcy that electric energy meter is proofreaied and correct.
In addition, be appreciated that this step is optional, in some other embodiment of the present invention, this step can not have yet.
After this process ends.
In three-phase electric energy meter, to the correction of three phase-splitting electric energy errors, carry out simultaneously.
In addition, be appreciated that traditional impulse correction method, in the time observing pulse, because the synthetic pulse output of three-phase (output of pulse has in other words represented the general power of three-phase), can only a phase one come mutually, otherwise do not know it is which phase role.In the present invention, adopt capability correction method, the calculating that directly active power in use table and reactive power are proofreaied and correct, and active power and reactive power in table is that three-phase has data simultaneously, so three-phase can be proofreaied and correct simultaneously.
Test duration is only original 1/3, has greatly saved correction T.T..
Under reactive load environment, adopt the higher and general performance number of accuracy to carry out correcting electric energy meter, more traditional impulse correction method, reduces alignment requirements and simplifies trimming process, highlight fast and accurate advantage easily again, realized single point correction electric energy meter error.
The actual calibration operation steps of client aspect (as ammeter Watch Factory): the source of maintaining the standard provides the 0.5L input of Un and lb (as 220V/5A), reads the active-power P of standard scale after system stability
iand reactive power Q
inumerical value, then remove to read the active power register P of computation chip in electric energy meter to be corrected
cwith reactive power register Q
c, application of formula (*) is calculated to such an extent that insert phase correction register and gain calibration register after Δ and Pg, completes the correction work to electric energy.If three-phase electric energy meter, to the correction of three phase-splitting A/B/C, can carry out simultaneously, save the time that traditional impulse method is proofreaied and correct.Certainly, client can drive the input of 0.5C, observes pulse error and goes to verify that electric energy error really proofreaies and correct, and here, 0.5C is capacitive load.
Each method embodiment of the present invention all can be realized in modes such as software, hardware, firmwares.No matter the present invention realizes with software, hardware or firmware mode, instruction code can be stored in the storer of computer-accessible of any type (for example permanent or revisable, volatibility or non-volatile, solid-state or non-solid-state, fixing or removable medium etc.).Equally, storer can be for example programmable logic array (Programmable Array Logic, be called for short " PAL "), random access memory (Random Access Memory, be called for short " RAM "), programmable read only memory (Programmable Read Only Memory, be called for short " PROM "), ROM (read-only memory) (Read-Only Memory, be called for short " ROM "), Electrically Erasable Read Only Memory (Electrically Erasable Programmable ROM, be called for short " EEPROM "), disk, CD, digital versatile disc (Digital Versatile Disc, be called for short " DVD ") etc.
Second embodiment of the invention relates to a kind of device of correcting electric energy meter electric energy error.Fig. 4 is the structural representation of the device of this correcting electric energy meter electric energy error.
Specifically, as shown in Figure 4, the device of this correcting electric energy meter electric energy error comprises:
The first phase-shift unit, for carrying out current signal the phase shift of predetermined phase angle.
The first phase-shift unit, for current signal being carried out to the phase shift of predetermined phase angle, the order of magnitude of predetermined phase angle is between 20 degree to 70 degree.
Input block, for being input to standard scale and electric energy meter to be corrected by the current signal of voltage signal and the output of the first phase-shift unit.
Power reading unit, for reading the first active power and first reactive power of standard scale output, reads the second active power and second reactive power of electric energy meter output to be corrected.
The first multiplier, for the first active power and the second reactive power are multiplied each other, product is as the first product.
The second multiplier, for the second active power and the first reactive power are multiplied each other, product is as the second product.
The 3rd multiplier, for the first active power and the second active power are multiplied each other, product is as the 3rd product.
The 4th multiplier, for the first reactive power and the second reactive power are multiplied each other, product is as the 4th product.
The 5th multiplier, for the first active power and the first active power are multiplied each other, product is as the 5th product.
The 6th multiplier, for the first reactive power and the first reactive power are multiplied each other, product is as the 6th product.
Subtracter, for subtracting each other the second product of the first product of the first multiplier output and the output of the second multiplier.
First adder, for being added the 4th product of the 3rd product of the 3rd multiplier output and the output of the 4th multiplier.
The first divider, for the result divided by first adder output by the result of subtracter output, the business of gained is as the phase angle of phase error of energy meter to be corrected.
Second adder, for being added the 6th product of the 5th product of the 5th multiplier output and the output of the 6th multiplier.
The second divider, for the result divided by second adder output by the result of first adder output, the business of gained, again divided by constant coefficient C, obtains the size of electric energy meter gain error to be corrected.
Writing unit, for writing the result of the result of the first divider output and the output of the second divider respectively phase correction register and the gain calibration register of electric energy meter to be corrected.
Wherein, in power reading unit, also comprise following subelement:
The 7th multiplier, for multiplying each other the current signal of voltage signal and the output of the first phase-shift unit.
The second phase-shift unit, for carrying out voltage signal the phase shift of 90 degree.
The 7th multiplier, also for multiplying each other the current signal of the voltage signal of the second phase-shift unit output and the output of the first phase-shift unit.
Low-pass filter, for carrying out low-pass filtering by the signal of the 7th multiplier output.
Be averaged subelement, for the signal multiple spot of low-pass filter output is averaged, obtain the first active power, the first reactive power, the second active power or the second reactive power.
In addition also comprise:
Authentication unit, for by current signal and through the voltage signal input end of predetermined phase angle phase shift to corrected electric energy meter, observe the error of output pulse, the order of accuarcy of the corrected electric energy meter of checking.
In three-phase electric energy meter, to the correction of three phase-splitting electric energy errors, carry out simultaneously.
The first embodiment is the method embodiment corresponding with present embodiment, present embodiment can with the enforcement of working in coordination of the first embodiment.The correlation technique details of mentioning in the first embodiment is still effective in the present embodiment, in order to reduce repetition, repeats no more here.Correspondingly, the correlation technique details of mentioning in present embodiment also can be applicable in the first embodiment.
It should be noted that, each unit of mentioning in the each equipment embodiment of the present invention is all logical block, physically, a logical block can be a physical location, also can be a part for a physical location, can also realize with the combination of multiple physical locations, the physics realization mode of these logical blocks itself is not most important, and the combination of the function that these logical blocks realize is the key that just solves technical matters proposed by the invention.In addition, for outstanding innovation part of the present invention, the above-mentioned each equipment embodiment of the present invention is not introduced the unit not too close with solving technical matters relation proposed by the invention, and this does not show that the said equipment embodiment does not exist other unit.
Although pass through with reference to some of the preferred embodiment of the invention, the present invention is illustrated and described, but those of ordinary skill in the art should be understood that and can do various changes to it in the form and details, and without departing from the spirit and scope of the present invention.
Claims (10)
1. a method for correcting electric energy meter electric energy error, is characterized in that, comprises the following steps:
Be input in standard scale and electric energy meter to be corrected by voltage signal with through the current signal of predetermined phase angle phase shift simultaneously;
Read the first active power and first reactive power of standard scale output;
Read the second active power and second reactive power of electric energy meter output to be corrected;
Using the product of the first active power and the second reactive power as the first product;
Using the product of the second active power and the first reactive power as the second product;
Using the product of the first active power and the second active power as the 3rd product;
Using the product of the first reactive power and the second reactive power as the 4th product;
Using the product of the first active power and the first active power as the 5th product;
Using the product of the first reactive power and the first reactive power as the 6th product;
By the difference of the first product and the second product divided by the 3rd product and the 4th product and, the business of gained is as the phase angle of phase error of energy meter to be corrected;
By the 3rd product and the 4th product and divided by the 5th product and the 6th product and, the business of gained, again divided by constant coefficient C, obtains the size of electric energy meter gain error to be corrected;
The size of the phase angle of phase error and gain error is write respectively in the phase correction register and gain calibration register of electric energy meter to be corrected.
2. the method for correcting electric energy meter electric energy error according to claim 1, it is characterized in that, be input in the step in standard scale and electric energy meter to be corrected by voltage signal with through the current signal of predetermined phase angle phase shift described, the order of magnitude of described predetermined phase angle is between 20 degree to 70 degree simultaneously.
3. the method for correcting electric energy meter electric energy error according to claim 2, is characterized in that, in described the first active power and the first reactive power that reads standard scale output; Read in the second active power of electric energy meter output to be corrected and the step of the second reactive power,
The calculation procedure of described the first active power and the second active power is:
Multiply each other by voltage signal with through the current signal of predetermined phase angle phase shift, the gained signal that multiplies each other is by low-pass filtering, and after filtering, multiple spot is averaged again, obtains the first active power or the second active power;
The calculation procedure of described the first reactive power and the second reactive power is:
First by voltage signal through 90 degree phase shifts, the later voltage signal of phase shift with multiply each other through the current signal of predetermined phase angle phase shift, the gained signal that multiplies each other is by low-pass filtering, after filtering, multiple spot is averaged again, obtains the first reactive power or the second reactive power.
4. the method for correcting electric energy meter electric energy error according to claim 3, it is characterized in that, after step in described phase correction register and the gain calibration register that the size of the phase angle of phase error and gain error is write respectively to electric energy meter to be corrected, further comprising the steps of:
Be input in corrected electric energy meter by current signal with through the voltage signal of predetermined phase angle phase shift, observe the error of output pulse, the order of accuarcy of the corrected electric energy meter of checking.
5. according to the method for the correcting electric energy meter electric energy error described in any one in claim 1 to 4, it is characterized in that, in three-phase electric energy meter, to the correction of three phase-splitting electric energy errors, carry out simultaneously.
6. a device for correcting electric energy meter electric energy error, is characterized in that, comprising:
The first phase-shift unit, for carrying out current signal the phase shift of predetermined phase angle;
Input block, for being input to standard scale and electric energy meter to be corrected by the current signal of voltage signal and the output of the first phase-shift unit;
Power reading unit, for reading the first active power and first reactive power of standard scale output, reads the second active power and second reactive power of electric energy meter output to be corrected;
The first multiplier, for the first active power and the second reactive power are multiplied each other, product is as the first product;
The second multiplier, for the second active power and the first reactive power are multiplied each other, product is as the second product;
The 3rd multiplier, for the first active power and the second active power are multiplied each other, product is as the 3rd product;
The 4th multiplier, for the first reactive power and the second reactive power are multiplied each other, product is as the 4th product;
The 5th multiplier, for the first active power and the first active power are multiplied each other, product is as the 5th product;
The 6th multiplier, for the first reactive power and the first reactive power are multiplied each other, product is as the 6th product;
Subtracter, for subtracting each other the second product of the first product of the first multiplier output and the output of the second multiplier;
First adder, for being added the 4th product of the 3rd product of the 3rd multiplier output and the output of the 4th multiplier;
The first divider, for the result divided by first adder output by the result of subtracter output, the business of gained is as the phase angle of phase error of energy meter to be corrected;
Second adder, for being added the 6th product of the 5th product of the 5th multiplier output and the output of the 6th multiplier;
The second divider, for the result divided by second adder output by the result of first adder output, the business of gained, again divided by constant coefficient C, obtains the size of electric energy meter gain error to be corrected;
Writing unit, for writing the result of the result of the first divider output and the output of the second divider respectively phase correction register and the gain calibration register of electric energy meter to be corrected.
7. the device of correcting electric energy meter electric energy error according to claim 6, is characterized in that, described the first phase-shift unit, and for current signal being carried out to the phase shift of predetermined phase angle, the order of magnitude of described predetermined phase angle is between 20 degree to 70 degree.
8. the device of correcting electric energy meter electric energy error according to claim 7, is characterized in that, described power reading unit, also comprises following subelement:
The 7th multiplier, for multiplying each other the current signal of voltage signal and the output of the first phase-shift unit;
The second phase-shift unit, for carrying out voltage signal the phase shift of 90 degree;
The 7th multiplier, also for multiplying each other the current signal of the voltage signal of the second phase-shift unit output and the output of the first phase-shift unit;
Low-pass filter, for carrying out low-pass filtering by the signal of the 7th multiplier output;
Be averaged subelement, for the signal multiple spot of low-pass filter output is averaged, obtain the first active power, the first reactive power, the second active power or the second reactive power.
9. the device of correcting electric energy meter electric energy error according to claim 8, is characterized in that, also comprises:
Authentication unit, for by current signal and through the voltage signal input end of predetermined phase angle phase shift to corrected electric energy meter, observe the error of output pulse, the order of accuarcy of the corrected electric energy meter of checking.
10. according to the device of the correcting electric energy meter electric energy error described in any one in claim 6 to 9, it is characterized in that, in three-phase electric energy meter, to the correction of three phase-splitting electric energy errors, carry out simultaneously.
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