CN110045318A - The device and method that assessment dynamic harmonic and temperature change influence electric energy meter error - Google Patents
The device and method that assessment dynamic harmonic and temperature change influence electric energy meter error Download PDFInfo
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Abstract
The present invention provides a kind of assessment dynamic harmonic and the device and method that influences on electric energy meter error of temperature change, it includes: standard scale and checklist, human-computer interaction module and harmonic source；Harmonic source is connect with standard scale and checklist respectively；Standard scale and checklist are connect with AD sampling module respectively；AD sampling module is connect with human-computer interaction module；The harmonic wave that harmonic source generation meets test demand is controlled by human-computer interaction module, and it is conveyed to the standard scale and checklist being placed in controllable constant-temperature constant humidity cabinet respectively, AD sampling module samples standard scale and checklist, sampled data is passed to human-computer interaction module to handle, processing result is shown on the screen of human-computer interaction module；Can harmonic wave situation and the electric energy meter temperature and humidity in actual working environment effectively in simulating grid actual motion variation, realize in the accurate evaluation to electric energy meter measurement error.
Description
Technical field
The present invention relates to electric measurement fields, and in particular to a kind of assessment dynamic harmonic and temperature change are to electric energy meter error
The device and method of influence.
Background technique
With the fast development of electric system, the scale of electric system is increasing, and the environment of operation also becomes increasingly complex,
All kinds of non-linear electrical equipments, transformer and all kinds of iron-core reactors are all the harmonic sources in power grid.As all kinds of harmonic sources hold
The growth of amount, influence of the harmonic wave to electrical energy measurement are also increasingly taken seriously.The electric energy meter standard GB/T17215 rule in China at present
The method and requirement of the test of electric energy meter harmonic wave influence amount are determined, but the stress_responsive genes waveform proposed can not reflect electricity completely
It can the actual live operating condition of table；In the presence of cannot harmonic wave situation effectively in simulating grid actual motion and electric energy meter in reality
The variation of temperature and humidity in working environment can not achieve under the influence of dynamic harmonic and temperature and humidity variation to the standard of electric energy meter measurement error
Really the problems such as metering.
Summary of the invention
The technical problem to be solved by the present invention is providing a kind of assessment dynamic harmonic and temperature change to electric energy meter error shadow
Loud device and method, with solve the prior art using the method for the test of electric energy meter harmonic wave influence amount as defined in GB/T17215 and
It is required that the stress_responsive genes waveform proposed cannot reflect the actual live operating condition of electric energy meter completely；In the presence of cannot effective mould
The variation of harmonic wave situation and the electric energy meter temperature and humidity in actual working environment in quasi- power grid actual motion, it is humorous to can not achieve dynamic
The problems such as under the influence of wave and temperature and humidity variation to the accurate metering of electric energy meter measurement error.
Technical solution of the present invention:
A kind of assessment dynamic harmonic and the device that influences on electric energy meter error of temperature change, it includes: standard scale and is detected
Table, human-computer interaction module are connect with harmonic source；Harmonic source is connect with standard scale and checklist respectively；Standard scale and checklist difference
It is connect with AD sampling module；AD sampling module is connect with human-computer interaction module.
The standard scale and checklist are placed in controllable constant-temperature constant humidity cabinet.
The human-computer interaction module, using S5P4418/Smart4418 series A ndroid development board.
The method for the device that a kind of described assessment dynamic harmonic and temperature change influence electric energy meter error, it includes:
Step 1 carries out basic worst error test, and the worst error during note test is ebase；I.e. when electric current and function
Under nominal operating conditions, electric energy meter works in reference condition rate factor, in the range of checklist accuracy class allows
The limiting value of the checklist error of indication is denoted as ebase；
Step 2 carries out temperature and humidity change test, and note test error is etemperature；
Step 3 carries out harmonic wave variation test, and pilot project includes quintuple harmonics test, square wave test, peaked wave test
It is tested with higher hamonic wave, error is respectively ae、be、ce、deRemember ae、be、ce、deMiddle worst error is eharmonic；
Step 4 calculates maximum composition error ec, its calculation formula is:
ebase--- the worst error in basic worst error test
etemperature--- temperature and humidity changes test error
eharmonic--- harmonic wave changes test error.
Progress temperature and humidity described in step 2 changes test, and note test error is etemperatureMethod are as follows: the change of temperature and humidity
By controllable constant-temperature constant humidity cabinet when environment temperature is 5 DEG C~35 DEG C, temperature control range are as follows: -5 DEG C~80 DEG C, temperature control precision are as follows:
It 0.5 DEG C, heats up as 4 DEG C/min, cools down as 1 DEG C/min, control wet range are as follows: 30%RH~98%RH, humid control precision are as follows:
2.5%RH is realized；Standard scale and checklist are placed in closed controllable constant-temperature constant humidity cabinet, not by condensed water, precipitation or icing
Influence, by human-computer interaction module be arranged epidemic disaster testing site, first press 25 DEG C of temperature, 30 DEG C of humidity 95%RH, temperature are wet
90%RH or 40 DEG C of temperature are spent, humidity 85%RH setting first allows the electric energy meter in off working state " freely empty before the test
2 hours are stood in climatic chamber under the conditions of gas ", starts error testing experiment after the temperature of electric energy meter is stablized；If more
A testing site is tested, then remembers that mean error is etemperature；
Harmonic test described in step 3, the expression formula of used voltage signal u (t) and current signal i (t) are as follows:
U (t)=U1sin(ω0t)+U5sin(5ω0T)=Unomsin(ω0t)+0.1Unomsin(5ω0t)
I (t)=I1sin(ω0t)+I5sin(5ω0T)=0.5Imaxsin(ω0t)+0.2Imaxsin(5ω0t)
In formula: ImaxFor maximum current, i.e., the instrument that manufacturer specifies meets the maximum current value of accuracy requirement；UnomFor
The specified instrument normal working voltage of nominal voltage, i.e. manufacturer.
The test of square wave described in step 3, used square wave voltage signal uF(t) and square wave current signal iF(t) expression formula
Are as follows:
uF(t)=U1sin(ω0t)+U3sin(3ω0t+π)+U5sin(5ω0t+π)+U7sin(7ω0t+π)
+U11sin(11ω0t+π)+U13sin(13ω0t+π)
=U1sin(ω0t)+0.038U1sin(3ω0t+π)+0.024U1sin(5ω0t+π)
+0.017U1sin(7ω0t+π)+0.01U1sin(11ω0t+π)+0.008U1sin(13ω0t+π)
iF(t)=I1sin(ω0t)+I3sin(3ω0t)+I5sin(5ω0t)+I7sin(7ω0t)
+I11sin(11ω0t)+I13sin(13ω0t)
=I1sin(ω0t)+0.3I1sin(3ω0t)+0.18I1sin(5ω0t)+0.14I1sin(7ω0t)
+0.09I1sin(11ω0t)+0.05I1sin(13ω0t)
The virtual value of square wave current is no more than Imax, fundamental wave I1Virtual value no more than 0.93 Imax, peak point current is not
It can exceed that 1.4 Imax；
Peaked wave voltage signal u used by peaked wave described in step 3 is testedD(t) and pinnacle signal wave current
iD(t) expression formula are as follows:
uD(t)=U1sin(ω0t)+U3sin(3ω0t)+U5sin(5ω0t+π)+U7sin(7ω0t)
+U11sin(11ω0t)+U13sin(13ω0t+π)
=U1sin(ω0t)+0.038U1sin(3ω0t)+0.024U1sin(5ω0t+π)
+0.017U1sin(7ω0t)+0.01U1sin(11ω0t)+0.008U1sin(13ω0t+π)
iD(t)=I1sin(ω0t)+I3sin(3ω0t+π)+I5sin(5ω0t)+I7sin(7ω0t+π)
+I11sin(11ω0t+π)+I13sin(13ω0t)
=I1sin(ω0t)+0.3I1sin(3ω0t+π)+0.18I1sin(5ω0t)+0.14I1sin(7ω0t+π)
+0.09I1sin(11ω0t+π)+0.05I1sin(13ω0t)
The virtual value of peaked wave electric current is no more than Imax, fundamental current I1Virtual value no more than 0.568
Imax, peak point current is no more than 0.855Imax。
Higher hamonic wave test in the electric current and voltage of step 3, used higher harmonic voltage signal u (t)
With the expression formula of higher harmonic current signal i (t) are as follows:
uh(t)=U1sin(2πfnomt)+Uhsin(h*2πfnomt)
=Unomsin(2πfnomt)+0.02Unomsin(h*2πfnomt)
ih(t)=I1sin(2πfnomt)+Ihsin(h*2πfnomt)
=0.5Imaxsin(2πfnomt)+Iminsin(h*2πfnomt)
In formula: h=15,16,17 ..., 40,40,39,38 ..., 15；fmonFor nominal frequency, IminIt is humorous for minimum current
Wave is applied on all voltage circuits or current loop simultaneously, and the frequency of signal is first from 15fmonTo 40fmonFrequency sweep is carried out,
Then again from 40fmonTo 15fmonFrequency sweep, calculates first-order error under each harmonic frequency, and note mean error is ce。
The invention has the advantages that:
The present invention has carried out the test that higher hamonic wave, square wave and peaked wave influence electric energy meter error；Square wave and peaked wave
Harmonic components it is richer, comprising 3,5,7,11,13 voltage and current harmonic waves and actual motion state closer to；It can more embody
Electric energy meter measures jamproof performance operation of the present invention simplicity, can generate the higher hamonic wave for meeting R46 electric energy meter international recommendation, side
Wave and peaked wave, can harmonic wave situation and the electric energy meter temperature and humidity in actual working environment effectively in simulating grid actual motion
Variation realizes accurate metering under the influence of dynamic harmonic and temperature and humidity variation to electric energy meter measurement error；It solves existing
Method and requirement of the technology using the test of electric energy meter harmonic wave influence amount as defined in GB/T17215, the stress_responsive genes waveform proposed
It cannot reflect the actual live operating condition of electric energy meter completely；In the presence of cannot harmonic wave situation effectively in simulating grid actual motion
With the variation of electric energy meter temperature and humidity in actual working environment, can not achieve dynamic harmonic and temperature and humidity variation under the influence of to electric energy
The problems such as accurate metering of table measurement error.
Detailed description of the invention
Fig. 1 is overall structure figure of the invention.
Fig. 2 is work flow diagram of the invention.
Specific embodiment
A kind of assessment dynamic harmonic and the device that influences on electric energy meter error of temperature change, the human-computer interaction module are distinguished
It is connect by RS-485 interface with harmonic source and A/D sampling module, have the function of controlling harmonic source and handles sampled data；Institute
It states harmonic source to connect with standard scale and checklist, the harmonic voltage of generation and harmonic current are separately input to standard scale and are detected
In table, voltage output terminal, yellow, green, red terminal is respectively A phase, B phase, C phase voltage output anode, and black terminal is public affairs
End altogether, current source output is yellow, green, and red terminal is respectively the anode of A phase, B phase, C phase electric current output, black terminal point
Not Wei the output of A phase, B phase, C phase electric current negative terminal, it is with line that voltage, the current input terminal one on these terminals and electric energy meter is a pair of
It should connect；The standard scale and checklist are placed in controllable constant-temperature constant humidity cabinet, pass through pressing on operation controllable constant-temperature constant humidity cabinet
Temperature and humidity in key control case；The A/D sampling module is connect by RS-485 communication serial port with standard scale and checklist
And acquire data and then handle the incoming human-computer interaction module of the data of sampling, processing result is displayed on the screen.
The human-computer interaction module, using S5P4418/Smart4418 series A ndroid development board.Possess Cortex-
Tetra- core processor of A9 and 7 cun of capacitance plates, manual dexterity, the speed of service are fast.It is connect by RS232 serial ports with peripheral hardware, completes to send
Instruction and the operation for receiving data.
The harmonic source uses the GY3030A three phase harmonic standard source of Wuhan Guo Yi Science and Technology Ltd., the harmonic source
Voltage and current be high-precision, high stability standard source output, software calibration；It is automatic that items output is all made of dynamic load
Adjustment technology reduces load regulation；Output frequency can arbitrarily be adjusted with 0.001Hz fineness；Between three-phase voltage, three-phase electricity
It can be with 0.001 ° of any phase shift of fineness between stream, between each phase voltage and electric current；Exportable 2~50 classical modulation harmonic waves, can
Carry out single or the superposition output of any multiple harmonic；Multiple communication interface, communication protocol open are had, user can voluntarily program control
Instrument processed carries out secondary development.
The method for the device that a kind of described assessment dynamic harmonic and temperature change influence electric energy meter error, it includes:
Step 1, carries out basic worst error test, and the worst error during note test is ebase；I.e. when electric current and function
Under nominal operating conditions, electric energy meter works in reference condition rate factor, in the range of checklist accuracy class allows
The limiting value of the checklist error of indication is denoted as ebase；
Step 2 carries out temperature and humidity and changes test, and note test error is etemperature；
Step 3, carries out harmonic wave variation test, and pilot project includes quintuple harmonics test, square wave test, peaked wave examination
It tests and is tested with higher hamonic wave, error is respectively ae、be、ce、deRemember ae、be、ce、deMiddle worst error is eharmonic；
Step 4 calculates maximum composition error ec, its calculation formula is:
ebase--- the worst error in basic worst error test
etemperature--- temperature and humidity changes test error
eharmonic--- harmonic wave changes test error
Controllable constant-temperature constant humidity cabinet described in step 2 is when environment temperature is 5 DEG C~35 DEG C, temperature control range are as follows: -5 DEG C~
80 DEG C, temperature control precision are as follows: 0.5 DEG C, heat up about 4 DEG C/min, and cool down about 1 DEG C/min, controls wet range are as follows: 30%RH~98%
RH, humid control precision are as follows: 2.5%RH；
Standard scale and checklist are placed in closed controllable constant-temperature constant humidity cabinet, not by condensed water, precipitation or the shadow of icing
It rings, epidemic disaster testing site is arranged by the touch screen controller on controllable constant-temperature constant humidity cabinet, following testing site: temperature is usually set
25 DEG C, 30 DEG C of humidity 95%RH, temperature, humidity 90%RH or 40 DEG C of temperature, humidity 85%RH first allow before test in inoperative
The electric energy meter of state stands 2 hours in climatic chamber under the conditions of " free air ", opens after the temperature of electric energy meter is stablized
The experiment of beginning error testing；If being tested in multiple testing sites, remember that mean error is etemperature；
Quintuple harmonics test in the electric current and voltage of step 3, used voltage signal u (t) and current signal i
(t) expression formula are as follows:
U (t)=U1sin(ω0t)+U5sin(5ω0T)=Unomsin(ω0t)+0.1Unomsin(5ω0t)
I (t)=I1sin(ω0t)+I5sin(5ω0T)=0.5Imaxsin(ω0t)+0.2Imaxsin(5ω0t)
Wherein ω0For angular speed, U1For fundamental voltage amplitude, U5For quintuple harmonics voltage magnitude, I1For fundamental current width
Value, I5For quintuple harmonics current amplitude, ImaxFor maximum current, i.e., the instrument that manufacturer specifies meets the maximum of accuracy requirement
Current value is generally labeled on the shell of electric energy meter, such as: 6A, 10A.UnomJust for nominal voltage, the i.e. specified instrument of manufacturer
Normal operating voltage is generally labeled on the shell of electric energy meter, such as 220V, 380V；
The square wave of step 3 is tested, used square wave voltage signal uF(t) and square wave current signal iF(t) expression formula
Are as follows:
uF(t)=U1sin(ω0t)+U3sin(3ω0t+π)+U5sin(5ω0t+π)+U7sin(7ω0t+π)
+U11sin(11ω0t+π)+U13sin(13ω0t+π)
=U1sin(ω0t)+0.038U1sin(3ω0t+π)+0.024U1sin(5ω0t+π)
+0.017U1sin(7ω0t+π)+0.01U1sin(11ω0t+π)+0.008U1sin(13ω0t+π)
iF(t)=I1sin(ω0t)+I3sin(3ω0t)+I5sin(5ω0t)+I7sin(7ω0t)
+I11sin(11ω0t)+I13sin(13ω0t)
=I1sin(ω0t)+0.3I1sin(3ω0t)+0.18I1sin(5ω0t)+0.14I1sin(7ω0t)
+0.09I1sin(11ω0t)+0.05I1sin(13ω0t)
Wherein UiFor i-th harmonic voltage amplitude (i=3,5,7,11,13), IiFor i-th harmonic current (i=3,
5,7,11,13), the virtual value of square wave current is no more than Imax, fundamental wave I1Virtual value no more than 0.93 Imax, peak value electricity
Stream is no more than 1.4 Imax；
The peaked wave of step 3 is tested, used peaked wave voltage signal uD(t) and pinnacle signal wave current iD(t)
Expression formula are as follows:
uD(t)=U1sin(ω0t)+U3sin(3ω0t)+U5sin(5ω0t+π)+U7sin(7ω0t)
+U11sin(11ω0t)+U13sin(13ω0t+π)
=U1sin(ω0t)+0.038U1sin(3ω0t)+0.024U1sin(5ω0t+π)
+0.017U1sin(7ω0t)+0.01U1sin(11ω0t)+0.008U1sin(13ω0t+π)
iD(t)=I1sin(ω0t)+I3sin(3ω0t+π)+I5sin(5ω0t)+I7sin(7ω0t+π)
+I11sin(11ω0t+π)+I13sin(13ω0t)
=I1sin(ω0t)+0.3I1sin(3ω0t+π)+0.18I1sin(5ω0t)+0.14I1sin(7ω0t+π)
+0.09I1sin(11ω0t+π)+0.05I1sin(13ω0t)
The virtual value of peaked wave electric current is no more than Imax, fundamental current I1Virtual value no more than 0.568Imax, peak value
Electric current is no more than 0.855Imax；
Higher hamonic wave test in the electric current and voltage of step 3, used higher harmonic voltage signal u (t) and high order
The expression formula of harmonic current signal i (t) are as follows:
uh(t)=U1sin(2πfnomt)+Uhsin(h*2πfnomt)
=Unomsin(2πfnomt)+0.02Unomsin(h*2πfnomt)
ih(t)=I1sin(2πfnomt)+Ihsin(h*2πfnomt)
=0.5Imaxsin(2πfnomt)+Iminsin(h*2πfnomt)
Wherein h be overtone order (h=15,16,17 ..., 40,40,39,38 ..., 15)；fmonFor nominal frequency, that is, make
Voltage (and electric current) frequency for working normally electric energy meter as defined in quotient is made, is labeled on the shell of electric energy meter, usually 50Hz；
IminFor minimum current, i.e., meets the minimum current value of class of accuracy of measuring instrument requirement as defined in manufacturer, be generally labeled in electric energy
On the shell of table, such as: 0.02A, 0.05A.Harmonic wave is applied on all voltage circuits or current loop simultaneously, the frequency of signal
It takes the lead in from 15fmonTo 40fmonFrequency sweep is carried out, then again from 40fmonTo 15fmonFrequency sweep calculates primary under each harmonic frequency
Error, note mean error are ce。
In order to be easy to understand the purpose realized of the present invention with effect, with reference to the accompanying drawing and specific detecting step,
The present invention is further explained:
Known in this detection by the information being detected on watch case: Imax=10A, Unom=220V, fmon=50Hz, Imin=
0.02A。
Step 1 carries out basic worst error test, makes to work as electric current and power factor under nominal operating conditions, electric energy meter
Work is in reference condition, the limiting value of measured checklist error of indication in the range of checklist accuracy class allows
ebase=0.0165%；
Step 2 carries out temperature and humidity and changes test, the testing site of selection are as follows: and 30 DEG C of temperature, humidity 90%RH, the examination measured
Test error etemperature=0.0279%；
Step 3 carries out quintuple harmonics test, the expression formula of voltage signal u (t) and current signal i (t) are as follows:
U (t)=220sin (2 π * 50t)+22sin (5*2 π * 50t) (1)
I (t)=5sin (2 π * 50t)+2sin (5*2 π * 50t) (2)
The test error a measurede=0.0401%
Step 4 is tested, used square wave voltage signal u into square waveF(t) and square wave current signal iF(t) expression formula
Are as follows:
The test error b measurede=0.0396%
Step 5 carries out peaked wave test, used peaked wave voltage signal uD(t) and pinnacle signal wave current iD(t)
Expression formula are as follows:
The average test error c measurede=0.0378%
Step 5 carries out higher hamonic wave test, higher harmonic voltage signal u (t) and higher harmonic current signal i's (t)
Expression formula are as follows:
uh(t)=220sin (2 π * 50t)+4.4sin (h*2 π * 50t) (7)
ih(t)=5sin (2 π * 50t)+0.02sin (h*2 π * 50t) (8)
Wherein h=15,16,17 ..., 40,40,39,38 ..., 15；
The average test error c measurede=0.0214%
Step 6 obtains harmonic wave and changes test error eharmonic=max { ae、be、ce、de}=max 0.0401%,
0.0396%, 0.0378%, 0.0214% }=0.0401%；
Step 7 calculates maximum composition error, its calculation formula is:
Claims (9)
1. a kind of assessment dynamic harmonic and the device that influences on electric energy meter error of temperature change, it includes: standard scale and checklist,
It is characterized by: human-computer interaction module is connect with harmonic source；Harmonic source is connect with standard scale and checklist respectively；Standard scale and by
Inspection table is connect with AD sampling module respectively；AD sampling module is connect with human-computer interaction module.
2. the device that a kind of assessment dynamic harmonic according to claim 1 and temperature change influence electric energy meter error,
Be characterized in that: the standard scale and checklist are placed in controllable constant-temperature constant humidity cabinet.
3. the device that a kind of assessment dynamic harmonic according to claim 1 and temperature change influence electric energy meter error,
It is characterized in that: the human-computer interaction module, using S5P4418/Smart4418 series A ndroid development board.
4. the side for the device that a kind of assessment dynamic harmonic as described in claim 1 and temperature change influence electric energy meter error
Method, it includes:
Step 1 carries out basic worst error test, and the worst error during note test is ebase；I.e. when electric current and power factor
Under nominal operating conditions, electric energy meter work is in reference condition, checklist in the range of checklist accuracy class allows
The limiting value of the error of indication is denoted as ebase；
Step 2 carries out temperature and humidity change test, and note test error is etemperature；
Step 3, progress harmonic wave change test, and pilot project includes quintuple harmonics test, square wave is tested, peaked wave is tested and high
Subharmonic test, error is respectively ae、be、ce、deRemember ae、be、ce、deMiddle worst error is eharmonic；
Step 4 calculates maximum composition error ec, its calculation formula is:
ebase--- the worst error in basic worst error test
etemperature--- temperature and humidity changes test error
eharmonic--- harmonic wave changes test error.
5. the side for the device that a kind of assessment dynamic harmonic according to claim 5 and temperature change influence electric energy meter error
Method, it is characterised in that: progress temperature and humidity described in step 2 changes test, and note test error is etemperatureMethod are as follows: temperature and humidity
Change by controllable constant-temperature constant humidity cabinet environment temperature be 5 DEG C~35 DEG C when, temperature control range are as follows: -5 DEG C~80 DEG C, temperature control
Precision are as follows: 0.5 DEG C, heat up as 4 DEG C/min, cool down as 1 DEG C/min, control wet range are as follows: 30%RH~98%RH, humid control essence
Degree are as follows: 2.5%RH is realized；Standard scale and checklist are placed in closed controllable constant-temperature constant humidity cabinet, not by condensed water, precipitation or
Epidemic disaster testing site is arranged by the touch screen controller on controllable constant-temperature constant humidity cabinet in the influence of icing, wet first by 25 DEG C of temperature
95%RH, 30 DEG C of temperature, humidity 90%RH or 40 DEG C of temperature are spent, humidity 85%RH setting is first allowed before the test in inoperative shape
The electric energy meter of state stands 2 hours in climatic chamber under the conditions of " free air ", starts after the temperature of electric energy meter is stablized
Error testing experiment；If being tested in multiple testing sites, remember that mean error is etemperature。
6. the side for the device that a kind of assessment dynamic harmonic according to claim 5 and temperature change influence electric energy meter error
Method, it is characterised in that: harmonic test described in step 3, the expression formula of used voltage signal u (t) and current signal i (t)
Are as follows:
U (t)=U1sin(ω0t)+U5sin(5ω0T)=Unomsin(ω0t)+0.1Unomsin(5ω0t)
I (t)=I1sin(ω0t)+I5sin(5ω0T)=0.5Imaxsin(ω0t)+0.2Imaxsin(5ω0t)
In formula: ω0For angular speed, U1For fundamental voltage amplitude, U5For quintuple harmonics voltage magnitude, I1For fundamental current amplitude,
I5For quintuple harmonics current amplitude, ImaxFor maximum current, i.e., the instrument that manufacturer specifies meets the maximum current of accuracy requirement
Value；UnomFor nominal voltage, the i.e. specified instrument normal working voltage of manufacturer.
7. the side for the device that a kind of assessment dynamic harmonic according to claim 5 and temperature change influence electric energy meter error
Method, it is characterised in that: the test of square wave described in step 3, used square wave voltage signal uF(t) and square wave current signal iF(t)
Expression formula are as follows:
uF(t)=U1sin(ω0t)+U3sin(3ω0t+π)+U5sin(5ω0t+π)+U7sin(7ω0t+π)+U11sin(11ω0t
+π)+U13sin(13ω0t+π)
=U1sin(ω0t)+0.038U1sin(3ω0t+π)+0.024U1sin(5ω0t+π)+0.017U1sin(7ω0t+π)+
0.01U1sin(11ω0t+π)+0.008U1sin(13ω0t+π)
iF(t)=I1sin(ω0t)+I3sin(3ω0t)+I5sin(5ω0t)+I7sin(7ω0t)+I11sin(11ω0t)+
I13sin(13ω0t)
=I1sin(ω0t)+0.3I1sin(3ω0t)+0.18I1sin(5ω0t)+0.14I1sin(7ω0t)+0.09I1sin(11
ω0t)+0.05I1sin(13ω0t)
In formula, UiFor i-th harmonic voltage amplitude (i=3,5,7,11,13), IiFor i-th harmonic current (i=3,5,7,
11,13), the virtual value of square wave current is no more than Imax, fundamental wave I1Virtual value no more than 0.93Imax, peak point current cannot
More than 1.4Imax。
8. the side for the device that a kind of assessment dynamic harmonic according to claim 5 and temperature change influence electric energy meter error
Method, it is characterised in that: peaked wave voltage signal u used by peaked wave described in step 3 is testedD(t) and pinnacle signal wave current iD
(t) expression formula are as follows:
uD(t)=U1sin(ω0t)+U3sin(3ω0t)+U5sin(5ω0t+π)+U7sin(7ω0t)+U11sin(11ω0t)+
U13sin(13ω0t+π)
=U1sin(ω0t)+0.038U1sin(3ω0t)+0.024U1sin(5ω0t+π)+0.017U1sin(7ω0t)+
0.01U1sin(11ω0t)+0.008U1sin(13ω0t+π)
iD(t)=I1sin(ω0t)+I3sin(3ω0t+π)+I5sin(5ω0t)+I7sin(7ω0t+π)+I11sin(11ω0t+
π)+I13sin(13ω0t)
=I1sin(ω0t)+0.3I1sin(3ω0t+π)+0.18I1sin(5ω0t)+0.14I1sin(7ω0t+π)+
0.09I1sin(11ω0t+π)+0.05I1sin(13ω0t)
The virtual value of peaked wave electric current is no more than Imax, fundamental current I1Virtual value no more than 0.568Imax, peak point current
No more than 0.855Imax。
9. the side for the device that a kind of assessment dynamic harmonic according to claim 5 and temperature change influence electric energy meter error
Method, it is characterised in that: the higher hamonic wave test in the electric current and voltage of step 3, used higher harmonic voltage signal u (t)
With the expression formula of higher harmonic current signal i (t) are as follows:
uh(t)=U1sin(2πfnomt)+Uhsin(h*2πfnomt)
=Unomsin(2πfnomt)+0.02Unomsin(h*2πfnomt)
ih(t)=I1sin(2πfnomt)+Ihsin(h*2πfnomt)
=0.5Imaxsin(2πfnomt)+Iminsin(h*2πfnomt)
In formula: h be overtone order (h=15,16,17 ..., 40,40,39,38 ..., 15)；fmonFor nominal frequency, IminFor most
Low current, harmonic wave are applied on all voltage circuits or current loop simultaneously, and the frequency of signal is first from 15fmonTo 0fmonInto
Row frequency sweep, then again from 40fmonTo 15fmonFrequency sweep, calculates first-order error under each harmonic frequency, and note mean error is ce。
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