CN1620613A  Electronic watthour meter, error adjusting method, and power calculating circuit  Google Patents
Electronic watthour meter, error adjusting method, and power calculating circuit Download PDFInfo
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 CN1620613A CN1620613A CN 02828047 CN02828047A CN1620613A CN 1620613 A CN1620613 A CN 1620613A CN 02828047 CN02828047 CN 02828047 CN 02828047 A CN02828047 A CN 02828047A CN 1620613 A CN1620613 A CN 1620613A
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Classifications

 G—PHYSICS
 G01—MEASURING; TESTING
 G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
 G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. by electricity meters
Abstract
Adjustment of the amplitude and phase balance can be realized only by applying the rated power having a powerfactor of '1.0' to an electronic watthour meter. An adjustment switch (272) is depressed to input the rated power having a powerfactor of '1.0' to an electronic watthour meter (200), thereby balanceadjusting the variations of the amplitudes of the outputs from a current converter circuit (223) and from a voltage converter circuit (224), and adjusting the phases from the values of the active and reactive powers. A fulladjustment is performed from the established rated value and from the calculation result of the power amount, and then the adjusted values are stored into an EEPROM (273). During metering, the adjusted values stored in the EEPROM (273) are used for adjustment, whereby a precise power amount can be obtained.
Description
Technical field
The present invention relates to electric current and voltage are carried out the A/D conversion with the electronic type watthour meter of measuring watthour and error method of adjustment thereof with according to the Power arithmetic circuit of electric current that is transformed into digital value and voltage operational power.
Background technology
Figure 22 is the composition diagram that the existing electronic type watthour meter that the flat 1164402 communique of patent disclosure disclosed is shown, and is mainly used in explanation and does the error adjustment that master meter method is relatively carried out with the output of master meter.
Among Figure 22, the 1st, the electronic type watthour meter, the 21st, current transformer, the 22nd, transformer, the 23rd, input current is carried out the electric current A/D transducer that A/D is transformed into digital value, the 24th, input voltage is carried out the voltage A/D transducer that A/D is transformed into digital value, the 25th, adjust starting switch, the 31st, the equilibrium that the A/D transformed value of the adjusted value of register 42 and voltage A/D transducer 24 multiplies each other is adjusted in equilibrium adjusted multiplier, the 32nd, the power multiplier that output that each phase current with electric current A/D transducer 23 is directly proportional and the voltage that is directly proportional with each phase voltage of voltage A/D transducer 24 multiply each other respectively, the 33rd, subtracter, the 34th, wave digital lowpass filter, the 35th, the underload adjustment totalizer of the adjusted value of underload adjustment register being carried out addition, the 36th, totalizer, the 37th, register, the 38th, amplitude comparator, the 39th, the counter that addition is carried out in the output pulse of amplitude comparator 38, the 40th, show display as the watthour of the accumulation result of counter 39.
The 41st, the phase place of storage phase adjustment value is adjusted detecting device (shift register), and the 42nd, detecting device is adjusted in the equilibrium of the balanced adjusted value of storage, and the 43rd, the underload of storage underload corrected value is adjusted the specified reference value detecting device that detecting device 4 is the specified reference values of storage.
The 45th, the CPU of computing adjusted value, the 46th, constitute the s operation control portion that comprises CPU45, the 47th, the communication interface (I/F) of control testing power supply device 56 usefulness, the 48th, EPROM, the 51st, power transfer device, the 52nd, control CPU, the 53rd, timer, the 54th, ROM, the 55th, communication interface, the 56th, the testing power supply device that constitutes by power transfer device 51, control CPU52, timer 53, ROM54, communication interface 55 and the dummy load testing power supply 60 that is used to adjust.
Have the adjustment of electronic type watthour meter in the following method.
(1) at first, to phase place adjust register 41, balanced adjust that register 42, underload adjust that register 43, specified reference value register 44 set storage in advance among the EPROM48 respectively adjust initial value.
(2) secondly, carry out the coarse adjustment that nominal load is adjusted.
CPU 45 is by communication interface 56 control testing power supply devices 56.Whole phase places are applied the power of rated voltage, rated current, power factor 1.0.With specified constant number of pulses (WK) (setting value) contrast of setting at specified reference value register 44 in the count value WO of at this moment counter 39 and (1), judge whether correlative value D=WO/WK is being in the specialized range at center with 1.0.Owing to be coarse adjustment, the specialized range of the value of specialized range during greater than full adjustment of hereinafter explanation.Correlative value D repeats to change the setting value WK of specified reference value register 44 outside specialized range the time, and D becomes in specialized range up to correlative value.This is called the coarse adjustment of nominal load.
(3) then, carry out equilibrium adjustment.
Below, one in the threephase is called A phase, B phase, C phase mutually.
At first, carry out the equilibrium adjustment of B phase.CPU45 only applies the power of rated voltage, rated current, power factor 1.0 mutually by communication interface 47 control testing power supply devices 56 to A, measure the power of certain hour, and the count value WA of the counter 39 in the storage certain hour.Secondly, only B is applied mutually the power of rated voltage, rated current, power factor 1.0, measure the power of certain hour, and same stored count value WB.Contrast WA, WB judge whether correlative value E=WB/WA is being in the specialized range at center with 1.0.Correlative value E repeats to change the balanced mutually balanced adjusted value of setting in the register 42 of B of adjusting toward the direction that becomes 1.0, in becoming specialized range outside specialized range the time.
Then, carry out the equilibrium adjustment of C phase, only C is applied mutually the power of rated voltage, rated current, power factor 1.0, measure the power of certain hour, and same stored count value WC.Use with B mutually balanced adjustment identical method carry out the equilibrium adjustment of C phase thereafter.
(4) then, adjust entirely.
CPU45 to whole power that applies rated voltage, rated current, power factor 1.0 mutually, measures the power measurement of certain hour by communication interface 47 control testing power supply devices 56, and the count value WO of the counter 39 in the storage certain hour.The specified constant number of pulses WK (setting value) that sets in contrast count value and (1), and judge whether correlative value F=WO/WK is being in the specialized range at center with 1.0.Correlative value F is outside specialized range the time, and carry out the coarse adjustment of nominal load: repeat to change the setting value WK of specified reference value register 44, F becomes in the specialized range up to correlative value.
(5) then, carry out the phase place adjustment.
At first, carry out the phase place adjustment of A phase.CPU45 only applies the power of rated voltage, rated current, power factor 1.0 mutually by communication interface 47 control testing power supply devices 56 to A, measure the power of certain hour, and the count value WA of the counter 39 in the storage certain hour.Then, carry out with (1) in the contrast of power factor constant pulse value WPK of setting, judge whether correlative value G=WPK/WA is being in the specialized range at center with 1.0.Correlative value G repeats to change the phase adjustment value that phase place is adjusted the A phase of register 41 toward the direction that becomes 1.0 outside specialized range the time, in becoming specialized range, and sets at this moment displacement progression.
Secondly, carry out the phase place adjustment of B phase.Only B is applied mutually the power of rated voltage, rated current, power factor 0.5, measure the power of certain hour, and same stored count value WB.Use with A phase phase place adjustment identical method carry out the phase place adjustment of B phase thereafter.
Then, carry out the phase place adjustment of C phase.Only C is applied mutually the power of rated voltage, rated current, power factor 0.5, measure the power of certain hour, and same stored count value WC.Use with A phase phase place adjustment identical method carry out the phase place adjustment of C phase thereafter.
More than in such electronic type watthour meter because the phase place of current transformer 21 and transformer 22 etc. and the difference of amplitude characteristic, produce phase place and amplitude error with the voltage and current of power lead.Reliable true dedicated custom chip adjustment amplitude and the phase place that watthour is used of measuring can not be used general outer dress A/D transducer error freely, and versatility is poor.
Again, postpone by the data incoming timing that makes voltage A/D transducer 24, promptly utilize phase place to adjust the displacement progression of register 41, carry out the phase place adjustment, thereby when using output to big transformer 21 of the phase deviation of input and current transformer 22, the displacement progression of phase place adjustment register 41 needs multistage, and promptly shift register needs many.Shift register is made of hardware, thereby the share of chip area increase progression, and it is big that circuit becomes, and the power consumption increase, and simultaneously along with the constant time lag time is elongated, except that phase place, frequency and amplitude also become big to the error of initial value.Existing problems.
Again,, need to use phase deviation to include this displacement progression scope interior current transformer 21 and transformer 22 in, need little high precision current transformer 21 of monomer phase shift difference and transformer 22 because utilization displacement progression is adjusted phase deviation.
Because displacement progression domination phase place is adjusted resolution, need the custom chip of the many or A/D transducer that builtin sampling frequency is high of displacement progression again.
During the error of electronic type watthour meter is adjusted, at first to whole phase input rated voltages, rated current, the power of power factor 1.0, the coarse adjustment of adjusting entirely, secondly in equilibrium is adjusted, respectively to every phase input rated voltage, rated current, the power of power factor 1.0, each carries out equilibrium adjustment mutually successively, then to whole phase input rated voltages, rated current, the power of power factor 1.0, adjust entirely, at last in phase place is adjusted, input rated voltage, rated current, the power of power factor 0.5 needs each to adjust successively mutually equally, thereby adjusts spended time.And, when wanting special change institute to adjust the meter constant of electronic type watthour meter 1,, also need the coarse adjustment time of initially carrying out owing to the initial value of the threshold value of amplitude comparator 38 is certain.
In the existing example, when adding the measurement function of idle watthour, need the power of input rated voltage, rated current, power factor 0.0 again, carry out the error adjustment.
Again, in the abovementioned method of adjustment, balanced adjustment, phase place adjustment are for accurate as the watthour of output, no matter in potential circuit, the current circuit which unbalanced main cause is, all with the output multiplying factor of analog form, to adjust equilibrium to the voltage conversion circuit of each phase; No matter in power circuit, the current circuit which the main cause of phase deviation is, all selects the conversion timing of each phase voltage translation circuit, thereby adjust phase place with analog form.Therefore, can not make the electronic type watthour meter have the function of the voltage and current of accurate each phase of measurement.
Summary of the invention
The present invention is for addressing the above problem error, and its purpose is: power or watthour measuring accuracy height is provided and can extensively tackles the phase place of current transformer and transformer and the electronic type watthour meter and the Power arithmetic circuit of amplitude excursion.
Another purpose is: provide the error adjustment time short electronic type watthour meter and error method of adjustment thereof.
Electronic type watthour meter of the present invention has carrying out the voltage conversion circuit that A/D is transformed into digital value with the voltage after the transformer transformation, to carrying out the current conversion circuit that A/D is transformed into digital value with the electric current after the current transformer unsteady flow, the output of described voltage conversion circuit is only carried out the 1st voltagephase transformation component of the 1st angular phase conversion, the output of described voltage conversion circuit is only carried out the 2nd voltagephase transformation component of the 2nd angular phase conversion, the output of described current conversion circuit is only carried out the current phase transformation component of described the 1st angular phase conversion, with the output multiplication of described the 1st voltagephase transformation component and described current phase transformation component to obtain the active power operational part of active power, with the output multiplication of described the 2nd voltagephase transformation component and described current phase transformation component to obtain the idle idle Power arithmetic portion of containing of containing power that comprises the reactive power component, according to of the phase deviation of the voltage of described transformer and the described converter primary end voltage after to current and phase difference and A/D conversion to current and phase difference, described active power and the described idle phase place that contains the described active power of capability correction and proofread and correct described transformer and described converter primary end electric current and voltage and A/D conversion simultaneously after electric current and the amplitude phase correction portion of the amplitude excursion of voltage, with the output multiplication of this amplitude phase correction portion to measure the watthour measurement section of watthour, and the watthour display that shows the watthour that described watthour measurement section is measured.Therefore, the measuring accuracy height of watthour can extensively be tackled the phase place and the amplitude excursion of voltage changer and power pack.
Again, the amplitude and the phase place of active power proofreaied and correct according to the active power and the idle idle power that contains that contains the output of Power arithmetic portion of amplitude excursion, phase deviation, the output of active power operational part by amplitude phase correction portion, thereby the operation efficiency height.
Again, amplitude phase correction portion in transformer and current transformer when adjusting the electric current with the voltage of power supply input known amplitude and phase place and known amplitude and phase place, ask active power operational part and idle active power and the idle power that contains that contains the adjustment usefulness that Power arithmetic portion asked according to described adjustment with the input of power supply, and, ask the correction coefficient of phase deviation and amplitude excursion according to these active power and idle theoretic active power and idle power that contains that contains power and utilize described known voltage, current known and the 2nd angle to try to achieve of adjusting usefulness.Therefore, the output of transformer and current transformer carried out the A/D transducer of A/D conversion can be with multiplexing type, even it is a kind of that the electric current of the voltage of known amplitude and phase place and known amplitude and phase place only has, also can obtain the correction coefficient of phase deviation and amplitude excursion.
Again, amplitude phase correction portion has following each one: the reference current storage part, by adjusting when importing the identical adjustment of each phase current and use electric current with power supply, store the output valve of a current conversion circuit output, storage simultaneously removes the coefficient of the output valve gained of other current conversion circuit output with the output valve of described current conversion circuit output; The reference voltage storage part, by adjusting when importing the identical adjustment of each phase voltage and use voltage with power supply, store the output valve of a voltage conversion circuit output, storage simultaneously removes the coefficient of the output valve gained of other voltage conversion circuit output with the output valve of described voltage conversion circuit output; Balanced adjustment part, when measuring watthour, with the output of described other current conversion circuit and the multiplication of described reference current storage portion stores, with the output of described other voltage conversion circuit and the multiplication of described reference voltage storage portion stores, output is balanced mutually to make each.Therefore, can adjust equilibrium at a high speed, the computational load of amplitude phase correction portion when reducing to measure.
Again, have following each one: storage is by adjusting the adjustment electric current storage part of using electric current with the adjustment of power supply input; The reference current storage part, by adjusting when importing the identical adjustment of each phase current and use electric current with power supply, store the output valve of a current conversion circuit output, storage simultaneously removes the coefficient of the output valve gained of other current conversion circuit output with the output valve of described current conversion circuit output; Current measurement portion, when measuring watthour, with the output valve of a current conversion circuit of the adjustment usefulness electric current of storing in the electric current storage part, described reference current storage portion stores and the coefficient of described each phase, ask the electric current of described each phase according to the output valve of described each phase current translation circuit output, described adjustment.Therefore, can accurately measure electric current.
Utilize the inching after the electric current of current measurement subordinate row side carries out coefficient storage, thereby can accurately measure electric current after the inching (hereinafter referred fine setting) again.
Again, have following each one: storage is by adjusting the adjustment voltage storage part of using voltage with the adjustment of power supply input; The reference voltage storage part, by adjusting when importing the identical adjustment of each phase voltage and use voltage with power supply, store the output valve of a voltage conversion circuit output, storage simultaneously removes the coefficient of the output valve gained of other voltage conversion circuit output with the output valve of described voltage conversion circuit output; Voltage measurement portion, when measuring watthour, with the output valve of a voltage conversion circuit of the adjustment usefulness voltage of storing in the voltage storage part, described reference voltage storage portion stores and the coefficient of described each phase, ask the voltage of described each phase according to the output valve of described each phase voltage translation circuit output, described adjustment.Therefore, can accurate measuring voltage.
Again, the watthour measurement section is carried out time integral to the output of amplitude phase correction portion, the computing watthour, whenever this watthour reaches threshold value, the output pulse, and has the storage rated current, rated voltage, the phase line standard, regulation is to the specified storage part of the sampling frequency of the meter constant of the umber of pulse of measured watthour output and A/D conversion, and full adjusted value operational part, this operational part is according to the rated current from described specified storage part input, rated voltage, phase line standard and meter constant, the theoretical cycle of the pulse that the watthour measurement section produces when asking input rated power, and detect input output figure place from each sampling of amplitude phase correction portion during rated power, the value of this figure place and the gained that multiplies each other from the sampling frequency of described specified storage part input and described theoretical cycle is set at threshold value.Therefore, can accurate measuring voltage.
Again, adjust power with power supply output rated voltage, rated current, power factor 1.0, thereby the adjustment efficient height of phase deviation and amplitude excursion.
Again, the difference of the 1st angle and the 2nd angle is 90 degree, and the idle power that contains is reactive power, thereby the operation efficiency height.
Have carrying out the voltage conversion circuit that A/D is transformed into digital value with the voltage after the transformer transformation again,, to carrying out the current conversion circuit that A/D is transformed into digital value with the electric current after the current transformer unsteady flow, the output of described voltage conversion circuit is only carried out the voltagephase transformation component of the 1st angular phase conversion, the output of described current conversion circuit is only carried out the 1st current phase transformation component of described the 1st angular phase conversion, the output of described current conversion circuit is only carried out the 2nd current phase transformation component of the 2nd angular phase conversion, with the output multiplication of described voltagephase transformation component and described the 1st current phase transformation component to obtain the active power operational part of active power, with the output multiplication of described voltagephase transformation component and described the 2nd current phase transformation component to obtain the idle idle Power arithmetic portion of containing of containing power that comprises the reactive power component, according to of the phase deviation of the voltage of described transformer and the described converter primary end voltage after to current and phase difference and A/D conversion to current and phase difference, described active power and the described idle phase place that contains the described active power of capability correction and proofread and correct described transformer and described converter primary end electric current and voltage and A/D conversion simultaneously after electric current and the amplitude phase correction portion of the amplitude excursion of voltage, with the output multiplication of this amplitude phase correction portion to measure the watthour measurement section of watthour, and the watthour display that shows the watthour that described watthour measurement section is measured.Therefore, watthour measuring accuracy height, and can extensively tackle the phase place and the amplitude excursion of voltage changer and power pack.
Electronic type watthour meter error method of adjustment of the present invention, this electronic type watthour meter has carrying out the voltage conversion circuit that A/D is transformed into digital value with the voltage after the transformer transformation, to carrying out the current conversion circuit that A/D is transformed into digital value with the electric current after the current transformer unsteady flow, with the output multiplication of voltage conversion circuit and current conversion circuit to obtain the active power operational part of active power, to make the output multiplication of the output of output delay 90 degree of described voltage conversion circuit and described current conversion circuit to obtain the reactive power operational part of reactive power, the watthour measurement section of output pulse when the value of the output multiplication gained of described active power operational part is surpassed threshold value, and the watthour display that shows the watthour that described watthour measurement section is measured, this error method of adjustment comprises following each step: the rated power input step, connecting on the electronic type watthour meter to adjust and use power supply, is 1.0 with power supply to whole rated power of input mutually and power factor from this adjustment; Balanced setup procedure, obtain the voltage of described voltage conversion circuit output and the ratio of the voltage of other voltage conversion circuit output, and utilize this than inverse the coefficient of each phase voltage equilibrium is stored when measuring, obtain the ratio of the electric current of the electric current of described current conversion circuit output and the output of other current conversion circuit again, and utilize this than inverse the coefficient of each phase current equilibrium is stored when measuring; Phase place is adjusted shift step, according to the active power that obtains from described active power operational part and described reactive power operational part and reactive power, described adjustment active power and the reactive power with power supply output, the voltage of the voltage of obtaining described transformer and described converter primary end after to current and phase difference and A/D conversion is also stored the phase deviation of current and phase difference; Input step, input rated current, rated voltage, phase line standard, the described watthour measurement section of regulation are to the meter constant of the umber of pulse of measured watthour output and the sampling frequency of A/D conversion; Full adjusted value calculation step is set threshold value to described watthour operational part.Therefore, the error adjustment time is short.
Again, electronic type watthour meter error method of adjustment of the present invention, this electronic type watthour meter is heterogeneous electronic type watthour meter, have carrying out the voltage conversion circuit that A/D is transformed into digital value with the voltage after the transformer transformation, to carrying out the current conversion circuit that A/D is transformed into digital value with the electric current after the current transformer unsteady flow, with the output multiplication of voltage conversion circuit and current conversion circuit to obtain the active power operational part of active power, to make the output multiplication of the output of output delay 90 degree of described voltage conversion circuit and described current conversion circuit to obtain the reactive power operational part of reactive power, the watthour measurement section of output pulse when the value of the output multiplication gained of described active power operational part is surpassed threshold value, and the watthour display that shows the watthour that described watthour measurement section is measured, this error method of adjustment comprises following each step: the rated power input step, connect on the electronic type watthour meter to adjust and use power supply, each alternate singlephase 2 line is connected, adjust with the power supply amount of imports from this and decide power and power factor for stipulating; Amplitude phase place setup procedure, according to the output of described Power arithmetic portion and described reactive power operational part, obtain the computing that utilizes rotation matrix adjust the power and power and the reactive power consistent coefficient of reactive power of a described phase with other phase; The nominal load setup procedure, the watthour pulse of described electronic type watthour meter is output as benchmark, makes to connect ground from each mutually singlephase 2 line and connect described adjustment and export consistent with the watthour output of master meter power supply, that accurately adjust the pulse output of watthour with the watthour pulse from this electronic type watthour meter; The phase place trim step after the adjustment of described amplitude phase place setup procedure and described nominal load setup procedure, according to from the input of described adjustment with power supply, is finely tuned the phase place of described electronic type watthour meter.Therefore, can adjust error in the same manner, adjust easily with singlephase 2 line formula instrument.
Again, electronic type watthour meter error method of adjustment of the present invention, this electronic type watthour meter is heterogeneous electronic type watthour meter, has carrying out the voltage conversion circuit that A/D is transformed into digital value with the voltage after the transformer transformation, to carrying out the current conversion circuit that A/D is transformed into digital value with the electric current after the current transformer unsteady flow, with the output multiplication of voltage conversion circuit and current conversion circuit to obtain the active power operational part of active power, to make the output multiplication of the output of output delay 90 degree of described voltage conversion circuit and described current conversion circuit to obtain the reactive power operational part of reactive power, the watthour measurement section of output pulse when the value of the output multiplication gained of described active power operational part is surpassed threshold value, and the watthour display that shows the watthour that described watthour measurement section is measured; Master meter also has described voltage transformating part, current transformation portion, active power operational part, reactive power operational part and the watthour measurement section equal with described electronic type watthour meter, and is subjected to the high precision adjustment in advance; When applying regulation power, Power arithmetic portion and reactive power operational part power input and reactive power by described electronic type watthour meter, on the other hand, Power arithmetic portion and reactive power operational part input power and reactive power at this moment from described master meter, and the amplitude phase coefficient of adjustment electronic type watthour meter, make the power of described electronic type watthour meter consistent with the power and the reactive power of described master meter with reactive power.Therefore, can high precision and adjustment at high speed.
Power arithmetic circuit of the present invention has the voltage input part of the voltage after the input digit conversion, the electric current input part of the electric current after the input digit conversion, the output of described voltage input part is only carried out the 1st voltagephase transformation component of the 1st angular phase conversion, the output of described voltage input part is only carried out the 2nd voltagephase transformation component of the 2nd angular phase conversion, the output of described electric current input part is only carried out the current phase transformation component of the 1st angular phase conversion, with the output multiplication of described the 1st voltage transformating part and described current phase transformation component to obtain the active power operational part of active power, with the output multiplication of described the 2nd voltage transformating part and described current phase transformation component to obtain the idle idle Power arithmetic portion of containing of containing power that comprises the reactive power component, and according to the theoretical value of the described voltage of described electric current and the phase deviation of operation values, described active power and the described idle phase correction portion of containing the described active power of capability correction.Therefore, power measurement precision height, and can extensively tackle the phase place and the amplitude excursion of voltage changer and power pack.
Description of drawings
Fig. 1 is the composition diagram of the electronic type watthour meter of embodiment of the present invention 1.
Fig. 2 is the composition diagram that the amplitude phase corrector of Fig. 1 is shown.
Fig. 3 is the figure of conversion example that the amplitude phase corrector of Fig. 1 is shown.
Fig. 4 is the figure of conversion example that the amplitude phase corrector of Fig. 1 is shown.
Fig. 5 is the figure of notion of the amplitude phase corrector of key diagram 1.
Fig. 6 is the composition diagram of the electronic type watthour meter of embodiment of the present invention 2.
Fig. 7 is the process flow diagram of running of the selfcorrecting device of key diagram 6.
Fig. 8 is the figure of notion of the amplitude phase correction of key diagram 6.
Fig. 9 is the composition diagram of the electronic type watthour meter of embodiment of the present invention 3.
Figure 10 is the composition diagram of electronic type watthour meter of the threephase 4 line formulas of embodiment of the present invention 4.
Figure 11 is the figure of adjustment flow process that the electronic type watthour meter of Figure 10 is shown.
Figure 12 is the figure that flow process is adjusted in equilibrium that the electronic type watthour meter of Figure 10 is shown.
Figure 13 is the figure that phase place that the electronic type watthour meter of Figure 10 is shown is adjusted flow process.
Figure 14 is the figure of full adjustment flow process that the electronic type watthour meter of Figure 10 is shown.
Figure 15 is the electronic type watthour meter of the expression Figure 10 active power in phase place is adjusted and the polar plot of the relation of reactive power.
Figure 16 is the electronic type watthour meter of the expression Figure 10 active power in watthour is measured and the polar plot of the relation of reactive power.
Figure 17 is the figure of the relation of the threshold value of electronic type watthour meter of expression Figure 10 and watthour pulse.
Figure 18 is the process flow diagram of current measurement of the electronic type watthour meter of explanation Figure 10.
Figure 19 is the composition diagram of the electronic type watthour meter of embodiment of the present invention 5.
Figure 20 is the composition diagram of the electronic type watthour meter of embodiment of the present invention 6.
Figure 21 is the figure of adjustment of the electronic type watthour meter of explanation embodiment of the present invention 7.
Figure 22 is the composition diagram that existing electronic type watthour meter is shown.
In the accompanying drawing, the 100th, the electronic type watthour meter, the 102nd, the Power arithmetic circuit, the 110th, the A/D transducer, the 112nd, the A/D transducer, the 120th, Hilbert transform device (homophase A), the 122nd, Hilbert transform device (quadrature), the 124th, Hilbert transform device (homophase B), the 126th, multiplier, the 128th, multiplier, the 130th, the amplitude phase corrector, the 132nd, external calibration portion, the 134th, power measurement instruments, the 136th, watthour pulse follower, the 138th, watthour display, the 140th, the binary amplitude phase corrector, the 150th, selfcorrecting device, the 152nd, initial value storage part, the 170th, effective value arithmetical unit, the 174th, the communication buffer device, the 180th, effective value arithmetical unit, the 184th, communication buffer device, the 191st, communication buffer device, the 195th, the communication buffer device, the 200th, electronic type watthour meter, the 221st, current transformer, the 222nd, transformer, the 223rd, current conversion circuit, the 224th, voltage conversion circuit, the 225th, effective value current operator portion, the 226th, effective value voltage operational portion, the 231st, current balance is adjusted operational part, the 232nd, electric voltage equalization is adjusted operational part, the 234th, balanced adjusted value operational part, the 241st, active power multiplier, the 242nd, the Hilbert transform device, the 243rd, reactive power multiplier, the 244th, phase adjustment value operational part, the 245th, wave digital lowpass filter, the 246th, wave digital lowpass filter, the 247th, totalizer, the 248th, totalizer, the 251st, meritorious watthour/frequency changer, the 252nd, idle watthour/frequency changer, the 253rd, full adjusted value operational part, the 254th, oscillatory circuit, the 255th, s operation control portion, the 261st, counter, the 271st, display, the 272nd, adjust switch, the 273rd, EEPROM, the 281st, the dummy load power supply, the 290th, V, the I measurement section, the 310th, balanced trimming part, the 312nd, current balance trimming part, the 314th, the electric voltage equalization trimming part, the 381st, dummy load power supply, the 382nd, communication interface, the 384th, PC, the 386th, master meter, the 388th, benchmark multimeter.
Preferred forms
Embodiment 1
Below, embodiments of the present invention 1 are described.Fig. 1 is the composition diagram of the electronic type watthour meter of embodiment of the present invention 1.Fig. 2 is the composition diagram that the amplitude phase corrector of Fig. 1 is shown.Fig. 3, Fig. 4 illustrate the conversion example of the amplitude phase corrector of Fig. 1.The notion of the amplitude phase corrector of Fig. 5 key diagram 1, transverse axis are the active power axle, and the longitudinal axis is the reactive power axle, and clockwise direction is the electric current direction leading with respect to voltage.
Among Fig. 1, the 100th, the electronic type watthour meter, the 102nd, the Power arithmetic circuit, the 110th, the A/D transducer (voltage conversion circuit) that the voltage V from unshowned transformer is carried out the A/D conversion, the 112nd, to carrying out the A/D transducer (current conversion circuit) of A/D conversion from the electric current I of unshowned current transformer, A/D transducer 110,112 can be with the general transducer of the phase position adjusting function that does not have shift register.
The 120th, the Hilbert transform device (homophase A) (the 1st voltagephase transformation component) that voltage is carried out Hilbert transform according to homophase (the 1st angle), the 122nd, according to the Hilbert transform device (quadrature) (the 2nd voltagephase transformation component) that voltage is carried out Hilbert transform with inphase quadrature, the 124th, according to the Hilbert transform device (homophase B) (current phase transformation component) that carries out Hilbert transform with electric current relatively.Here, Hilbert transform, wellknown as the conversion that makes phase lag 90 degree, about these digital allpass filters, on the books in " digital filter design " (work is done by formula portion, the distribution of Tokai University publishing house) etc.
The 126th, with the output multiplication of Hilbert transform device (homophase A) 120 and Hilbert transform device (homophase B) 124 and the multiplier (active power operational part) of the preceding active power x of output calibration, the 128th, with the output multiplication of Hilbert transform device (quadrature) 122 and Hilbert transform device (homophase B) 124 and the multiplier (reactive power operational part) of the preceding reactive power y of output calibration.
The 130th, the amplitude phase corrector of correction active power x and reactive power y hereinafter describes in detail.
The 132nd, import phase coefficient (being also referred to as outside phase correcting value) φ that is corrected into no phase deviation and the external calibration portion that is corrected into amplitude coefficient (the being also referred to as amplitude external calibration value) A of no amplitude excursion from the outside, know phase coefficient φ and amplitude coefficient A in the embodiment 1 in advance.Here, phase deviation is because of the phase place and the amplitude characteristic of transformer and current transformer (not shown) etc. produce, and is (the phase deviation of θ+φ) of the secondary voltage of the primary voltage of transformer and current transformer and current and phase difference θ and transformer and current transformer and current and phase difference.Amplitude coefficient is the inverse of the secondary amplitude of transformer and current transformer to the primary voltage of transformer and current transformer and the ratio of electric current (amplitude excursion).In the embodiment 1, known phase toward electric current to the lag direction skew of φ of voltage, amplitude be 1/A doubly.
The 134th, reactive power y ' after proofreading and correct back active power x ' and proofreading and correct is multiplied each other to obtain the power measurement instruments of watthour, the 136th, meritorious watthour and idle watthour from power measurement instruments 134 inputs are exported the watthour pulse efferent of quantity with the pulse of its size variation, the 138th, show from the meritorious watthour of power measurement instruments 134 inputs and/or the watthour display part (watthour display) of idle watthour.
Among Fig. 2, the 140th, utilize from the phase place external calibration value φ of external calibration portion 132 inputs and amplitude external calibration value A to active power x before proofreading and correct and before proofreading and correct reactive power y proofread and correct and output calibration after active power x ' and proofread and correct 2 of back reactive power y ' and tie up the amplitude phase correctors.
Then, amplitude when carrying out watthour measures and the correction running of phase place are described.
With reference to figure 5, utilizing from the phase place external calibration value φ and the skew of amplitude external calibration value A phase calibration of 132 inputs of external calibration portion, as long as before will proofreading and correct active power x and proofread and correct before reactive power y clockwise direction rotate φ and make amplitude be A doubly.That is to say, 2 dimension amplitude phase correctors, 140 (Fig. 2) before multiplier 126 and multiplier 128 inputs are proofreaied and correct active power x and proofread and correct before during reactive power y,, can proofread and correct back active power x ' and proofread and correct back reactive power y ' from the phase place external calibration value φ and the amplitude external calibration value A of 132 inputs of external calibration device with in advance by formula 1.
As Fig. 3 or shown in Figure 4, the mode that can lowpass filter 142,144,146,148 be set according to prime or the back level at 2 dimension amplitude phase correctors 140 constitutes amplitude phase corrector 130 shown in Figure 2.Because lowpass filter 142,144,146,148 is set, energy filtering high fdrequency component, and utilize the pulse of the watthour that the power measurement instruments 132 be equivalent to electronic type watthour meter 100 exports in 1 cycle at power supply, calculate measuring error, thereby can suppress to shake the error of generation.
Because above such composition, phase place external calibration value φ precision is unlimited, the measuring accuracy height of watthour.
Not by utilizing shift register to make time shift, phase deviation is proofreaied and correct, but suc as formula 1 and shown in Figure 5, utilize the multiplier 126 of binary transfer pair computing active power (active power x before proofreading and correct) and reactive power (reactive power y before proofreading and correct), 128 output is proofreaied and correct, thereby A/D transducer 110,112 can use universal product, and do not exist along with adjustment (correction) scope that enlarges precision and phase place, register progression increases, the problem that chip (circuit board) area occupied strengthens, not needing that not only number of shift register stages is carried out in phase deviation sets and adjusts, and can tackle big current transformer of phase place and/or amplitude excursion and deviation thereof and transformer, during again with the time shift that uses shift register along with phase place becomes big, it is big that error becomes, its correction time, elongated situation was opposite, even adopt phase place and/or big current transformer and the transformer of amplitude excursion, the measuring accuracy of watthour height during also than the time shift that uses shift register can be finished its correction the short time.
Also because the difference of utilizing Hilbert transform device (homophase A) 120, Hilbert transform device (quadrature) 122, Hilbert transform device (homophase B) 124 to make the 1st angle and the 2nd angle is the Hilbert transform of 90 degree, fast operation, and can obtain active power and reactive power simultaneously.
In the abovementioned correction, phase place external calibration value φ and amplitude external calibration value A are provided respectively, but A cos φ and A sin φ are provided as the external calibration value, then can proofread and correct amplitude and phase place, operation efficiency height simultaneously.
The example that utilizes 122 pairs of voltages of Hilbert transform device (quadrature) to carry out 90 degree phase tranformations has been described, but also can have carried out 90 degree phase tranformations electric current.
Embodiment 2
Below, embodiment 2 is described.Fig. 6 is the composition diagram of the electronic type watthour meter of embodiment of the present invention 2.Fig. 7 is the process flow diagram of running of the selfcorrecting device of key diagram 6.Fig. 8 is the figure of notion of the amplitude phase corrector of key diagram 6, and transverse axis is an active power, and the longitudinal axis is a reactive power, and clockwise direction is the electric current direction leading to voltage.
Among Fig. 6, the 150th, keep phase coefficient and the isoparametric selfcorrecting device of amplitude coefficient, the 152nd, the initial value storage part, storage is injected into voltage V, the electric current I of the elementary known amplitude phase place of transformer and current transformer (not shown) by the dummy load power supply of adjusting usefulness (adjust and use power supply) (not shown).Other causes part identical with embodiment 1, thereby omits its explanation.
Then, running is described.
Be injected into voltage V, the electric current I of the elementary known amplitude phase place of transformer and current transformer (not shown) by the dummy load power supply of adjusting usefulness (adjust and use power supply) (not shown).The reactive power y as active power x before the correction of the output of multiplier 126,128 and before proofreading and correct that obtains from this voltage V, electric current I distorts because of amplitude such as transformer, current transformer, mimic channel (not shown) and phase place.
On the other hand, communicate by letter by manual input or with the dummy load power supply of adjusting usefulness, power supply V, the electric current I of the known amplitude phase place that the dummy load power supply of adjusting usefulness is injected store initial value storage part 152 into.
Electronic type watthour meter 100 is under the situation of the adjustment modes of dummy load power supply that utilize to adjust usefulness, by not to active power x before proofreading and correct " and proofread and correct before reactive power y " the path 150a supply selfcorrecting device 150 that carries out the correction of amplitude phase corrector 130.
With reference to figure 7, selfcorrecting device 150 carries out computing (S12) from voltage V, the electric current I (S10) of initial value storage part 152 input known amplitude phase places to these active power initial values (theoretical value) X and reactive power initial value (theoretical value) Y.
Then, proofread and correct preceding active power x from path 150a input " and proofread and correct preceding reactive power y " (S14), utilize active power initial value X, reactive power initial value (theoretical value) Y, proofread and correct preceding active power x " and proofread and correct preceding reactive power y ", below computing comprises the hereinafter α and the β of explanation of correction angle (phase coefficient) ψ and amplitude correction values B like that, and utilize path 150b with selfcorrecting on the occasion of α and β as selfcorrecting on the occasion of outputing to amplitude phase corrector 130 (S16).
With Fig. 8 computing among the S16 is described.
With formula 2 represent active power initial value X, reactive power initial value Y, proofread and correct before active power x ", proofread and correct its reactive power y ", the relation of correction angle ψ and amplitude correction values B.
In the formula 2, establish B cos ψ=α, B sin ψ=β then can be expressed as formula 3:
Ask α and β from formula 3, then
α and β comprise amplitude correction values B and correction angle ψ, so can former state use as corrected value.When hope was known amplitude correction values B and correction angle ψ by selfcorrecting device 150, available formula 5 was obtained.
Electronic type watthour meter 100 is behind S16, and the 130 storage selfcorrectings of amplitude phase corrector then make adjustment modes finish on the occasion of α and β, become the routine measurement pattern.
In the test pattern, during from transformer and current transformer (not shown) input voltage V, electric current I, utilize based on active power x before the control and the correction of the formula 6 of reactive power y before proofreading and correct, can obtain to proofread and correct reactive power y ' after back active power x ' and the correction.
Because above such composition, even under the situation that the A/D transducer of input voltage V and electric current I 110,112 is not taken a sample simultaneously, also can make the sampling skew of proofreading and correct conversion A/D transducer 110,112, thereby can replace A/D transducer 110,112 with 1 composite A/D transducer.
Again because the voltage of importing is carried out 90 degree phase tranformations, reactive power before active power and the correction before union is proofreaied and correct, do not need as prior art, to use voltage, the electric current of multiple amplitude phase places such as power factor 1.0 and power factor 9.5, the dummy load power supply of adjusting usefulness is only imported voltage V, the electric current I of a kind of known amplitude phase place, just can obtain selfcorrecting on the occasion of α and β, can make easy to adjust and the time weak point.
Again owing to utilize selfcorrecting active power x before proofreading and correct and the preceding reactive power of correction to be proofreaied and correct the operation efficiency height on the occasion of α and β.
Illustrated utilize selfcorrecting on the occasion of α and β to active power x before proofreading and correct, proofread and correct before the example proofreaied and correct of reactive power y, but identical with embodiment 1, also available amplitude correction values B and correction angle ψ proofread and correct active power x, the preceding reactive power y of correction before proofreading and correct.
Embodiment 3
Below, embodiment 3 is described.Fig. 9 is the composition diagram of the electronic type watthour meter of embodiment of the present invention 3.Embodiment 3 is combinations of embodiment 1 and embodiment.Proofread and correct at first by selfcorrecting device 150 and as enforcement mode 2 is illustrated, calculate corrected value, and then utilize the external calibration value to finely tune.
If active power is x before proofreading and correct, reactive power is y before proofreading and correct, the amplitude correction values that selfcorrecting device 150 is obtained is B (doubly), correction angle is ψ, amplitude external calibration value is A (doubly), and angle external calibration value is φ, and proofreading and correct back active power is x ', proofreading and correct the back reactive power is y ', the correction when then utilizing formula 7 to measure.
At this moment, in order to simplify computing, the part of computing correction coefficient in advance then can be in the formula 7:
Wherein,
α’＝A B?cosφ cosψ
β '=A B sin φ sin ψ (formula 9)
Owing to above such composition, can carry out selfcorrecting and external calibration, efficient height simultaneously.
Embodiment 4
The following describes embodiment of the present invention 4.Figure 10 is the composition diagram of electronic type watthour meter of the threephase 4 line formulas of embodiment of the present invention 4.Figure 11 illustrates the adjustment flow process of the electronic type watthour meter of Figure 10.Flow process is adjusted in the equilibrium that Figure 12 illustrates in the electronic type watthour meter of Figure 10.Figure 13 illustrates the phase place of the electronic type watthour meter of Figure 10 and adjusts flow process.Figure 15 is the electronic type watthour meter of the expression Figure 10 active power in phase place is adjusted and the polar plot of the relation of reactive power.Figure 16 is the electronic type watthour meter of the expression Figure 10 active power in watthour is measured and the polar plot of the relation of reactive power.Figure 17 is the threshold value in the electronic type watthour meter of expression Figure 10 and the figure of the relation of watthour pulse.Figure 18 is the process flow diagram of current measurement in the electronic type watthour meter of explanation Figure 10.
Among Figure 10, the 200th, the electronic type watthour meter, the 221st, current transformer, the 222nd, transformer, the 223rd, input current A/D is transformed into the current conversion circuit of the digital value that is directly proportional with input current, the 224th, input voltage A/D is transformed into the voltage conversion circuit of the digital value that is directly proportional with input voltage, the 225th, obtain the effective value current operator portion of the effective value of each phase current from the output of current conversion circuit 223, the 226th, obtain the effective value voltage operational portion of the effective value of each phase voltage from the output of voltage conversion circuit 224.
The 231st, the current balance of the output multiplication of current balance adjusted value and current conversion circuit 223 is adjusted multiplier, the 232nd, the electric voltage equalization of the output multiplication of electric voltage equalization adjusted value and voltage conversion circuit 224 is adjusted multiplier, the 234th, obtain B phase voltage, C phase voltage to the balanced adjusted value of A phase voltage and B phase current, C phase current balanced adjusted value operational part (balanced adjustment part) to the balanced adjusted value of A phase current.
The 241st, active power multiplier (active power operational part), output that will be directly proportional and the output multiplication that is directly proportional with each phase voltage of voltage conversion circuit 224 respectively with each phase current of current conversion circuit 223, and its operation result taken advantage of phase adjustment value as the output of phase adjustment value operational part 224, to obtain active power.
The 242nd, the output that is directly proportional with each phase current of input current translation circuit 223 and be the Hilbert transform devices that each current phase mutually postpones 90 degree.In the embodiment 4, for the purpose of simplifying the description, Hilbert transform device 242 only is shown, as with embodiment 1～3 in the Hilbert transform device (homophase) and the equivalent structure of Hilbert transform device (quadrature) of explanation.Promptly, this equivalent structure is: among Figure 10, Hilbert transform device 242 is replaced the Hilbert transform device (quadrature) that explanation in the embodiment 1 is set, and the Hilbert transform device (homophase) of explanation in the embodiment 1 is set before the output terminal of current conversion circuit 223, active power multiplier 241, the Hilbert transform device (homophase) of explanation in the embodiment 1 is set behind voltage changer 224 output terminals.
The 243rd, the reactive power multiplier, output that will be directly proportional and the output multiplication that is directly proportional with each voltage mutually as the electric current with each phase retardation 90 degree of the output of Hilbert transform device 242, its result takes advantage of the phase adjustment value as the output of phase adjustment value operational part 244, to obtain reactive power.The 244th, obtain and adjust the phase adjustment value operational part of each phase current the phase adjustment value of the phase deviation of each phase voltage, the 245th, each that only makes active power multiplier 241 be the wave digital lowpass filter that passes through of DC component of output mutually, the 246th, each that only makes reactive power multiplier 243 be the wave digital lowpass filter that passes through of DC component of output mutually, the 247th, to wave digital lowpass filter 245 each mutually output carry out addition totalizer, the 248th, to wave digital lowpass filter 246 each mutually output carry out addition totalizer.The output of current conversion circuit 223 is equivalent to the 1st current phase transformation component, and Hilbert transform device 242 is equivalent to the 2nd current transformation portion, and the output of voltage conversion circuit 224 is equivalent to the voltagephase transformation component.
The 251st, at the add up meritorious watthour/frequency changer of the meritorious watthour of gained output pulse during greater than the threshold value of full adjusted value operational part 253 outputs of the output to totalizer 247, the 252nd, at the add up idle watthour/frequency changer of the idle watthour of gained output pulse during greater than the threshold value of full adjusted value operational part 253 outputs of the output to totalizer 248, the 253rd, ask the full adjusted value operational part of the threshold value of meritorious watthour/frequency conversion part 251 and idle watthour/frequency changer 252, the 254th, produce the oscillatory circuit of vibration by the cycle identical with the sampling frequency of current conversion circuit 223 and voltage conversion circuit 224.
The 255th, to balanced adjusted value operational part 234, the s operation control portion that phase adjustment value operational part 244 and full adjusted value operational part 253 are controlled, the 261st, the counter of meritorious watthour/frequency changer 251 of metering and the pulse of idle watthour/frequency report period 252, the 271st, the meritorious watthour of display counter 261 meterings and the variable of idle watthour, each display of effective value voltage mutually that each phase effective value electric current that effective value current operator portion 225 measures and effective value voltage operational portion 226 measure, the 272nd, adjust switch, the 273rd, EEPROM, the 274th, watthour computing circuit, the 281st, the dummy load power supply that is used to adjust (adjust and use power supply).The 290th, the V of measuring voltage and electric current, I measurement section (current measurement portion, voltage measurement portion), the 292nd, the terminal of the voltage and current of gained is measured in output.
Then, adjustment is described.
Shown in the process flow diagram of Figure 11, the measuring accuracy that makes electronic type watthour meter 200 is the following step of using in the range of allowable error that is adjusted into.
(1) apply rated power, power factor (S100),
(2) set ratings (ratings setting) (S200),
(3) adjust the voltage of each phase, the deviation of current amplitude (the balanced adjustment) (S300),
(4) voltage, current and phase difference (phase place adjustment) of adjusting each phase (S400),
The threshold value of the watthour/frequency transformation when (5) adjustment applies rated power (the full adjustment) (S500).
Below, describe S100～S500 in detail.
(1) applies rated power, power factor (S100)
The dummy load power supply 281 of adjusting usefulness is connected to adjustment object electronic type watthour meter 200.Dummy load power supply 281 applies the power of power factor 1.0 for electronic type watthour meter 200.
(2) ratings setting (S200)
In the embodiment 4, be that threephase 4 line systems, rated voltage are that 240V, rated current are that 5A, meter constant are 10000 pulses/kilowatt hour (kWh) as the phase line standard, describe ratings.In advance at EEPROM (measurement storage part) 273 registration ratings.
Utilization is pushed and is adjusted switch 272 starting adjustment.The stay alone ratings (phase line standard, rated power supply, rated current, meter constant) of the electronic type watthour meter 200 of storage among the EEPROM 273 is set to s operation control portion 255.According to the ratings of setting in the s operation control portion 255, decision becomes the phase of adjusting object.That is, under the situation of threephase 4 line systems, the object of balanced adjustment, phase place adjustment is whole A phases, B phase, C phase.When singlephase 3 line systems, threephase 3 line systems, object is A phase, C phase; During singlephase 2 lines, only be the A phase.
(3) the balanced adjustment
With reference to Figure 12 balanced the adjustment is described.
When the current balance adjustment is proofreaied and correct A phase～C is imported same current mutually in the output of current conversion circuit 223 the B phase current to A phase current and C phase current deviation based on the network constant of current transformer 221 and current conversion circuit 223 to the A phase current.When the electric voltage equalization adjustment is proofreaied and correct A phase～C is imported identical voltage mutually in the output of voltage conversion circuit 224 the B phase voltage to A phase voltage and C phase voltage deviation based on the network constant of transformer 222 and voltage conversion circuit 224 to the A phase voltage.
When pushing adjustment switch 272 by S200 (Figure 11), electronic type watthour meter 200 becomes adjustment modes, the primary side of current transformer 221, transformer 222 is applied the power of power factor 1.0, and output to current conversion circuit 223 and voltage conversion circuit 224 from their out secondary.224 pairs of current conversion circuit 223 and voltage conversion circuits are exported after each is transformed into digital signal with the simulating signal of input respectively mutually.
(Irms) 225 of effective value current operator portion be according to the output of current conversion circuit 223, computing A phase effective value electric current, B phase effective value electric current, C phase effective value electric current (S302, S304, S306).
Equally, (Vrms) 226 of effective value voltage operational portion be according to the output of voltage conversion circuit 224, computing A phase effective value voltage, B phase effective value voltage, C phase effective value voltage (S312, S314, S316).
Balanced adjusted value operational part 234 is from effective value current operator portion 225 input A phase effective value electric currents, B phase effective value electric current, C phase effective value electric current, again from effective value voltage operational portion 226 input A phase effective value voltages, B phase effective value voltage, C phase effective value voltage (S318).
Balanced adjusted value computing circuit 234 utilizes following calculating to ask the balanced adjusted value (S320) of B phase current.
The balanced adjusted value of B phase current=B phase effective value electric current ÷ A phase effective value electric current
In multiplier 231 with B mutually the A/D conversion output multiplication of the balanced adjusted value of this B phase current with current conversion circuit 223, thereby the deviation of the network constant of correction B phase current.
The current balance adjusted value (S322) that uses the same method and ask the C phase.
Balanced adjusted value computing circuit 234 utilizes following calculating to ask the balanced adjusted value (S324) of B phase voltage.
The balanced adjusted value of B phase voltage=B phase effective value voltage ÷ A phase effective value voltage
In multiplier 232 with B mutually the A/D conversion output multiplication of the balanced adjusted value of this B phase voltage with voltage conversion circuit 224, thereby the deviation of the network constant of correction B phase voltage.
The electric voltage equalization adjusted value (S326) that uses the same method and ask the C phase.
Each the balanced adjusted value that utilizes S320～S326 to obtain is deposited EEPROM 237 (S328).By S328, control operational part 255 finishes balanced the adjustment, transfers to the phase place adjustment.
(4) phase place adjustment
With reference to Figure 13 the phase place adjustment is described.
When phase place is adjusted at each of A phase～C phase is imported identical voltage, electric current mutually in the output of correcting current translation circuit 223 and voltage conversion circuit 224 the A phase current to A phase voltage, B phase current to B phase voltage, C phase current phase differential to the C phase voltage.This phase differential is produced by current transformer 221, transformer 222, current conversion circuit 223 and voltage conversion circuit 224.
The following describes the principle that phase place is adjusted.
Figure 15 is a polar plot, when before the expression phase place adjustment electronic type watthour meter being applied the power of rated power, power factor 1.0, as the active power W of totalizer 247 and totalizer 248 operation result separately
_{0}With reactive power var
_{0}Relation.Because of phase differential (phase deviation) takes place for current transformer 221, transformer 222, current conversion circuit 223, voltage conversion circuit 224,, but produce reactive power between electric current and the voltage so power factor is 1.0.
Be located at and get W on the coordinate
_{0}And var
_{0}The time be X
_{0}(W
_{0}, var
_{0}), when then importing the power of rated power, power factor 1.0, the angle that should proofread and correct is φ, with calculating φ=arctan (var
_{0}÷ W
_{0}) obtain angle φ.
Figure 16 is as the polar plot of the relation of the active power of the totalizer 247 of electronic type watthour meter 200 and totalizer 248 operation result separately and reactive power during the expression watthour is measured.Active power W before phase place is adjusted
_{1}, reactive power var
_{1}With the adjusted active power W of phase place
_{2}, reactive power var
_{2}Phase differential be abovementioned angle φ.
In the measurement, adjust preceding coordinate X according to phase place
_{1}(W
_{1}, var
_{1}) and the phase place adjustment in the angle φ that obtains, ask the adjusted coordinate X of phase place with formula 10
_{2}(W
_{2}, var
_{2}).
Therefore, by calculating W
_{2}=W
_{1}Cos φ+var
_{1}Sin φ and var
_{2}=W
_{1}Sin φ+var
_{2}Cos φ can adjust phase differential.
According to Figure 13, carry out the phase place adjustment by following step.
To the output of wave digital lowpass filter 245 input active power multipliers 241, and from wave digital lowpass filter 245 output A phase active power, B phase active power, C phase active power.
To the output of wave digital lowpass filter 246 input reactive power multipliers 243, and from wave digital lowpass filter 246 output A phase reactive powers, B phase reactive power, C phase reactive power.
Phase adjustment value operational part 244 is from wave digital lowpass filter 245,246 input A phase active power, B phase active power, C phase active power, A phase reactive power, B phase reactive power and C reactive power (S402～S416) mutually.
Phase adjustment value operational part 244 is obtained the phase adjustment value (S422) of A phase according to A phase active power and A reactive power mutually with following calculating:
Phase adjustment value=the arctan of A phase (A phase active power ÷ A phase reactive power).
Obtain B phase and C phase adjustment value (S424, S426) mutually equally.At this moment, only " A phase active power " is changed into " B phase active power " and " AB is reactive power mutually " or " C phase active power " and " C is reactive power mutually " with " A is reactive power mutually ", obtain with regard to using the method mutually identical with abovementioned A.
The phase adjustment value that S422～S426 is obtained stores EEPROM273 (S430) into.By S430, control operational part 225 makes phase place adjust progression, transfers to full adjustment.
(5) the full adjustment
With reference to Figure 14 full adjustment is described.
To be input to active power/frequency changer 251 as the active power operation result of the output of totalizer 247.The value (active power) of 251 pairs of inputs of active power/frequency changer is carried out time integral, and when integral result surpasses the threshold value that full adjusted value operational part 253 sets, output is from the pulse of oscillatory circuit 254 inputs, thus the pulse (with reference to Figure 17) that 261 outputs are directly proportional with active power to counter.
Equally, the reactive power of 252 pairs of inputs of reactive power/frequency changer is carried out time integral, and when integral result surpasses the threshold value that full adjusted value operational part 253 sets, output is from the pulse of oscillatory circuit 254 inputs, thus the pulse (with reference to Figure 17) that 261 outputs are directly proportional with reactive power to counter.
For example, the sampling frequency of the A/D transducer that uses in current conversion circuit 223 and the voltage conversion circuit 224 is during as 2kHz, obtain 1 time during the data 0.5ms from current conversion circuit 223 and voltage conversion circuit 224 and upgrade, thereby carry out 1 time during the watthour computing of active power/frequency changer 251 and reactive power/frequency changer 252 (threshold value verification) 0.5ms.Therefore, the highest frequency of the idle watthour pulse of the 251 meritorious watthour pulses of active power/frequency changer and reactive power/frequency changer 252 is 2kHz, and oscillatory circuit 254 need be to the pulse of active power/frequency changer 251 and reactive power/frequency changer 252 output 2kHz.
In full the adjustment, during from the power of dummy load power supply 281 input rated power, power factor 1.0, the frequency of obtaining and use the frequency of the meritorious watthour pulse of active power/frequency changer 251 outputs to equal the idle watthour pulse of the threshold value of the frequency that meter constant and rated power determined and 252 outputs of reactive power/frequency changer equals the threshold value of the frequency of meter constant and rated power decision.
According to the ratings of setting in the s operation control portion 255, the frequency (the specified pulsed frequency of reactive power) of the idle watthour pulse of the frequency (the specified pulsed frequency of active power) of the meritorious watthour pulse of active power/frequency changer 251 outputs and 252 outputs of reactive power/frequency changer (S502) when asking the rated power input.
In the embodiment 4, when input rated power, power factor 1.0, because rated power is that 3 * 240V * 5A=3.6kWh, meter constant are 10000 pulses/kWh, the frequency of its meritorious watthour pulse (the specified pulsed frequency of active power) is 10000 * 3.6 ÷ 3600=10Hz.Equally, when input rated power, power factor 0.0, because rated power is that 3 * 240V * 5A=3.6kvarh, meter constant are 10000 pulses/kvarh, the frequency of watthour pulse that it is idle (the specified pulsed frequency of reactive power) is 10000 * 3.6 ÷ 3600=10Hz.Therefore, meritorious watthour pulse, idle watthour pulse all when input rated power (power factor of meritorious watthour is 1.0, and the power factor of idle watthour is 0.0), are exported 1 pulse during the 100ms.
Ask the threshold value (S504) of meritorious watthour pulse with following method.251 pairs of operation results from totalizer 247 inputs of meritorious watthour/frequency changer carry out time integral.For example, when establishing input rated power and power factor 1.0, taking a sample each time is fixed as 0708h (h:16 system) from the figure place of totalizer 247 outputs, then add up during the 100ms 200 times, thereby accumulated value (figure place) is 57E40h.Therefore, 57E40h is a threshold value, and the time integral result in meritorious at every turn watthour/frequency changer 251 surpasses 57E40h, the pulse that 261 outputs are imported from oscillatory circuit 254 to counter.
Ask the threshold value (S506) of idle watthour pulse with following method.In the adjustment electronic type watthour meter 200 is imported rated power, power factor 1.0, thereby reactive power is 0.Yet, because the output from current conversion circuit 223, voltage conversion circuit 224 is subjected to balanced adjustment, phase place adjustment, when input rated power, power factor 0.0, the reactive power operation result of totalizer 248 and the active power operation result of totalizer 247 are each sampling 0708h with value.Therefore, the threshold value of idle watthour also is and the identical 57E40h of idle watthour threshold value, and the time integral result in idle watthour/frequency changer 252 surpasses 57E40h, the pulse that 261 outputs are imported from oscillatory circuit 255 to counter.
Store the threshold value (adjusted value) that S502～S506 obtained into EEPROM (S508).By S508, finish to adjust entirely, thereby make taking measurement of an angle of electronic type watthour meter 200 be the adjustment end of using in the range of allowable error.
The measurement of electric current and voltage then, is described.
With reference to Figure 18, among the abovementioned S200 (Figure 11), V, I measurement section 290 (S610) are imported and stored into to the rated current of setting in the s operation control portion 255.
Then, when equilibrium is adjusted, the A phase effective value electric current (S612) among input and the storage S302 (Figure 12).
Then, make A that S610 and S612 obtain rated current and the A size corresponding (S614) of effective value electric current mutually mutually.For example, rated current is 5A, and effective value is 0960h, and is corresponding with 5A when then making 0906h.
When the watthour measurement pattern of electronic type watthour meter 200, the output of current conversion circuit 223 is input to effective value current operator portion 225.At this moment, 225 couples of A of effective value current operator portion import original electric current (output) mutually, to other B mutually and C import mutually by equilibrium and adjust the in addition electric current of balanced adjustment of multiplier 231.The effective value electric current of effective value current operator portion 225 computing gained is input to V, I measurement section 290.
The V of input effective value electric current, I measurement section 290 are utilized the effective value electric current mutually as the rated current of giving corresponding relation among the input current of effective value electric current input and the S614 and A, measure electric current (S616).For example, input current is 0900h, then electric current=0900h ÷ 0906h * 5A=4.8A.This measured value is by terminal 292 outputs or demonstration on display 271.
Voltage also can be measured in the same manner with mentioned above.
In sum, the error method of adjustment of electronic type watthour meter only from dummy load power supply input rated power, power factor 1.0, just can be carried out equilibrium adjustment, phase place adjustment, thereby shorten the adjustment time automatically, makes the property produced in batches raising.
Even the change that the meter constant of the pulsed frequency when importing as rated power is subjected to is big, also can adjust with the short time.
Again, the testing power supply device that example has the function switched with the control of switching on, phase place of communicating by letter with the electronic type watthour meter like that need not be had, dummy load power supply 281 can be only use, thereby can cheapness composition test macro.
Again, because according to voltage, the current measurement result of each phase, the voltage signal and the current signal of the phase of the principal element that becomes deviation carried out equilibrium adjustment, phase place adjustment, can accurately measure the voltage and current of each phase.
Also owing to be not to make voltage time displacement like that in the past,, have the effect identical with embodiment 1 promptly because without shift register.And the A/D transducer of available multiplexing type in current conversion circuit 223 and the voltage conversion circuit 224 can make 200 miniaturizations of electronic type watthour meter.
Compare with embodiment 1, can make balanced the adjustment at a high speed, when reducing to measure to the computational load of active power multiplier 241 and reactive power operational part 243 (amplitude phase correction portion).
In the computing of the balanced S302～S318 (Figure 12) that adjusts operational part 234, illustrated with A serve as that base is adjusted balanced example to electric current and voltage mutually, but also can in S318, import the execution value of each phase the time, the big young pathbreaker of this value middle as the benchmark phase.Ask the balanced adjusted value of S320～S328.At this moment, need in advance current balance to be adjusted operational part 231 and be set at A mutually, but most phase deviation is little with electric voltage equalization adjustment part 232, the height that takes measurement of an angle, and can shorten phase place and adjust operation time.
Illustrated from the example of dummy load power supply 281 input rated power, power factor 1.0, but power, regulation power factor are stipulated in input, also can carry out the error adjustment that the adjustment time increases a little.
Set forth the example of adjusting with power factor 1.0 in the abovementioned explanation, but, preferably adjusted with power factor 0.5 from the angle of high precision adjustment.That is, its reason is, when adjusting with power factor 0.5, when the active power that phase change is brought changes ratio greater than power factor 1.0, and reactive power is big when adjusting than with power factor 1.0, thereby can carry out the phase place adjustment by higher precision.
Embodiment 5
Below, embodiments of the present invention 5 are described.Figure 19 is the composition diagram of the electronic type watthour meter of embodiment of the present invention 5.Among Figure 19, the 310th, balanced trimming part, 312 are provided in a side of the descending side's of multiplier 243 current balance trim values operational part, and 314 are provided in a side of the descending side's of multiplier 241 electric voltage equalization trim values operational part.Other ingredient is identical with embodiment 4, thereby omits its explanation.
Balanced trimming part 310 only is used for carrying out when needing after the error adjustment finely tune with master meter by S100～S500 (Figure 11), and it forms identical with balanced adjusted value operational part 234, asks B phase and C balanced adjusted value mutually according to the step of S302～S328 (Figure 12).With the difference of balanced adjusted value operational part 234 be: constitute when doing the watthour measurement, with balanced adjusted value supplying electric current balanced fine setting operational part 312 and electric voltage equalization fine setting operational part 314.When carrying out the equilibrium fine setting, also make phase place usually and finely tune and finely tune entirely, but identical with embodiment 4, also utilize phase place to adjust operational part 244 and carry out these fine settings with full adjustment operational part 253.
In sum, descending side at the multiplier 241,243 of computational calculation power carries out the equilibrium fine setting, thereby can the value of remaining valid current operator portion 225 and the precision of effective value voltage operational portion 226, utilize V, I measurement section 290 (only being shown in Figure 10) also can accurately measure electric current and voltage after the fine setting.
Embodiment 6
Below, embodiment of the present invention 6 is described.Figure 20 is the composition diagram of the electronic type watthour meter of embodiment of the present invention 6, omit phase 2 is shown, but this phase structure is identical with phase 3 with phase 1.
Have voltage signal is carried out AD transducer (voltage conversion circuit) 110_1 and the 110_3 that AD changes, current signal is carried out AD transducer (current conversion circuit) 112_1 and the 112_3 of AD conversion, also have described voltage conversion circuit 110_1, the output of 110_3 and described current conversion circuit 112_1, active power x (x1 before the output multiplication of 112_3 and the output calibration, x3) multiplier (active power operational part) 126_1,126_3, to voltage by Hilbert transform device (quadrature) (voltagephase transformation component) 122_1 that carries out Hilbert transform with respect to the mode of inphase quadrature, 122_3, electric current is carried out Hilbert transform device (homophase) (current phase transformation component) 124_1 of homophase Hilbert transform, 124_3, with described voltagephase transformation component 122_1, the output of 122_3 and described current phase transformation component 124_1,124_3 multiplies each other and output calibration preceding reactive power y (y1, multiplier y3) (the idle Power arithmetic portion of containing) 128_1,128_3.Have again input proofread and correct before active power x and proofread and correct before behind reactive power y and the output calibration active power x ' and proofread and correct after amplitude phase corrector 130_1, the 130_3 of reactive power y '.
By prime equalization is set and handles (for example lowpass filter) 127_1,127_3,129_1,129_3 at amplitude phase corrector 130_1,130_3, reactive power y is stable before making preceding power x of the correction that is input to amplitude phase corrector 130_1,130_3 and correction, can make correction of amplitude and phase correction accurately.
Can be from factor alpha and the factor beta (reference implementation mode 2) of external settingup amplitude phase corrector 130_1,130_3.
Have active power x ' after the abovementioned correction again and proofread and correct back reactive power y ' and add up with the power measurement instruments 134 of obtaining watthour, to from the meritorious watthour of power measurement instruments 134 inputs and/or idle watthour output quantity watthour pulse efferent 136 with the pulse of its size variation.
Each also has after the abovementioned correction of input active power x ' mutually respectively and makes the instantaneous value equalization 190_1 of portion of its equalization, 190_3, with the communication output instantaneous value equalization 190_1 of portion, the power communication buffer 191_1 of portion of the output of 190_3,191_3, with the abovementioned instantaneous value equalization 191_1 of portion, the output transform of 191_3 becomes the power physical quantity transformation component 192_1 of physical quantity, 192_3, import the reactive power y ' after the abovementioned correction and the instantaneous equalization 194_1 of portion of equalization in addition, 194_3, with the communication output instantaneous value equalization 194_1 of portion, the reactive power communication buffer 195_1 of portion of the output of 194_3,195_3, with the abovementioned instantaneous value equalization 194_1 of portion, the output transform of 194_3 becomes the power physical quantity transformation component 196_1 of physical quantity, 196_3.
Can set the physical conversion coefficient W1a, W3a, Var1a, the Var3a that use described power physical quantity transformation component 192_1,192_3 and reactive power physical quantity transformation component 196_1, the 196_3 from configuration part 193_1,193_3,197_1, the 197_3 of outside.When the physical conversion coefficient W1a that uses among described power physical quantity transformation component 192_1,192_3 and reactive power physical quantity transformation component 196_1, the 196_3, W3a, Var1a, Var3a have carried out amplitude adjustment and phase place adjustment in amplitude phase correction portion, can be each mutually shared value, utilize this point can reduce memory capacity and setting item.
Power physical quantity transformation component 192_1,192_3 and reactive power physical quantity transformation component 196_1,196_3 needn't often work, can be only require instantaneous power W (W1, W3) and idle instantaneous power Var (Var1, work in the time of Var3), thereby can reduce operand.
Each has respectively again mutually to voltage conversion circuit 110_1, the effective value voltage operational 170_1 of portion of effective value computing is carried out in the output of 110_3,170_3, to current conversion circuit 112_1, the effective value current operator 180_1 of portion of effective value computing is carried out in the output of 112_3,180_3, to the described effective value voltage operational 170_1 of portion, the instantaneous value equalization 172_1 of portion of the averaging of output of 170_3,172_3, with the communication output instantaneous value equalization 172_1 of portion, the effective value voltage communication buffer 174_1 of portion of the output of 172_3,174_3, with the described instantaneous value equalization 172_1 of portion, the output transform of 172_3 becomes the effective value voltage physical quantity transformation component 178_1 of physical quantity, 178_3, to the described effective value current operator 180_1 of portion, the instantaneous value equalization 182_1 of portion of the averaging of output of 180_3,182_3, with the communication output instantaneous value equalization 182_1 of portion, the effective value voltage communication buffer 184_1 of portion of the output of 182_3,184_3, with the described instantaneous value equalization 182_1 of portion, the output transform of 182_3 becomes the effective value voltage physical quantity transformation component 188_1 of physical quantity, 188_3.
Can set the physical quantity conversion coefficient V1a, V3a, I1a, the I3a that use described effective value voltage physical quantity transformation component 178_1,178_3 and effective value electric current physical quantity transformation component 188_1, the 188_3 from configuration part 176_1,176_3,186_1, the 186_3 of outside.In the computing of effective value, do not need to adjust phase place, the amplitude adjustment in the effective value computing is then carried out in described effective value voltage physical quantity transformation component 178_1,178_3 and effective value electric current physical quantity transformation component 188_1,188_3.
Described effective value voltage physical quantity transformation component 178_1,178_3 and effective value electric current physical quantity transformation component 188_1,188_3 needn't often work, and can only work when requiring effective value voltage V1rms, V3rms, thereby can reduce operand.
Because abovementioned such composition, the measuring accuracy height, can extensively tackle the amplitude and the phase deviation of voltage conversion circuit and current conversion circuit, often the operand that carries out also reduces, even the low hardware of arithmetic capability also can be realized, and adjusted value V1a, V3a, I1a, I3a, W1a, W3a, Var1a, Var3a be all from external settingup, thus with compare in inner selfadjusting, memory span can reduce.
Embodiment 7
The following describes embodiment of the present invention 7.Figure 21 is the figure of the electronic type watthour meter method of adjustment of explanation embodiment of the present invention 2.
In the embodiment 7, under the situation of polyphase meter (for example electronic type watthour meter), also connect (make the voltage connection that respectively is in parallel, make the electric current connection that respectively is in series) and adjust with singlephase 2 line systems.Connect by carrying out singlephase 2 line systems, identical this prerequisite of voltage and current that is input to each phase is set up, thereby respectively the operation values of middle computing must be all identical mutually.When inequality, be the difference that the deviation of voltage input circuit portion and current input circuit portion and AD transformation component 110,112 causes, need to proofread and correct.As long as the dummy load power supply that uses in the adjustment 381 is can be with singlephase 2 lines output, compares energy cheapness composition with the equipment with the dummy load power supply 281 of embodiment 4,5.Owing to needn't change method of attachment according to the phase line standard of the electronic type watthour meter of adjusting 100, make adjustment equipment inexpensive again, it is also easy to adjust preparation.
Below, even when adjusting heterogeneous (for example threephase 4 line systems) electronic type watthour meter 100, also record and narrate as carrying out the situation that singlephase 2 line systems connect.Adjustment is taken as all and controls PC384 by communication interface 382, and the output of dummy load power supply 381 can be controlled with communication interface 382 from PC384.Foot man 384 communicates by letter with electronic type watthour meter 100 available communication interfaces 382.
(1) at first adjusts amplitude equalization, the phase equalization of each phase.
By communication interface 382 control dummy load power supplys 381, apply the power of rated power, power factor 0.5 from PC 384.Here power factor also can be beyond 0.5, but when selecting the big power factor of data variation with respect to phase change power and reactive power, phase place is adjusted precision and improved, thereby the phase power factor is 0.5.
Here, by communication interface 382 data are input to PC384 from the power communication buffer portion 191 (191_1,191_2 (not shown), 191_3) of each phase with each reactive power communication buffer portion 195 (195_1,195_2 (not shown), 195_3) mutually from electronic type watthour meter 100.The data of the power communication buffer portion 191 of described each phase are W1, W2, W3, and the data of described reactive power communication buffer portion 195 are var1, var2, var3.Connect owing to carry out singlephase 2 line systems, the voltage of input, electric current are identical in each phase, (W1, var1), (W2, var2), (W3, var3) Biao Shi coordinate is necessary identical.Adjust the amplitude phase corrector 130 (130_1,130_2 (not shown), 130_3) of each phase, make abovementioned coordinate identical, for example make the coordinate of phase 1 consistent with the coordinate of other phase.Here, the coefficient of the amplitude phase corrector of each phase is α 1, β 1, α 2, β 2, α 3, β 3.
For example, when making mutually 1 coordinate consistent, carry out as follows with the coordinate of phase 2.The coefficient of the amplitude phase corrector 130 in the moment of obtaining coordinate points from electronic type watthour meter 100 is recited as α 1, α 2, α 3=1, β 1, β 2, β 3=0, but abovementioned coefficient is other value, also is not difficult to make the coordinate unanimity.
Mutually 1 coordinate with 2 the phase difference θ that compares 12 mutually is:
Phase difference θ 12=arctan (var2/W2)arctan (var1/W1) (formula 11)
2 coordinate to the amplitude ratio Gain12 of the coordinate of phase 1 is mutually:
(formula 12)
Therefore, to mutually α 2, the β 2 of 2 amplitude phase corrector, electron beam watthour meter 100, set α 2=Gain12 * cos (Δ θ 12), β 2=Gain12 * sin (Δ θ 12) by communication interface 382 from PC 384.
Again, utilize formula 3, can turn to:
With mentioned above identical, set factor alpha 1, β 1, α 2, β 2, α 3, the β 3 of the amplitude phase corrector 130 of the phase that needs correction from PC384 by communication interface 382, thereby can adjust amplitude excursion, the phase deviation of each phase.
(2) secondly, carry out the adjustment of watthour nominal load.
Control dummy load power supplys 381 from PC384 by communication interface 382, to apply the power of rated power, power factor 1.0.Utilize pulse that pulse and the master meter 386 of watthour pulse efferent 136 output of electronic type watthour meter 100 export relatively, carry out the adjustment of watthour nominal load.The ratio adjustment of the stepbystep counting of the output stepbystep counting of the electronic type watthour meter of exporting in the relatively available certain hour of pulse 100 and master meter 386 outputs, also the ratio adjustment of the pulsed frequency of the pulsed frequency of available electron formula watthour meter 100 outputs and master meter 386 outputs.
In the electronic type watthour meter 100 of embodiment 7, can be according to abovementioned (W1, var1), (W2, var2), (W3, var3) specified reference value of coordinate and watthour (threshold value of output watthour pulse) and the specified reference value of idle watthour (exporting the threshold value of idle watthour pulse) are calculated the watthour and the idle watthour of 136 outputs of watthour pulse efferent.For example, the phase line standard is under the situation of threephase 3 line systems, and with additional calculation mutually 1, mutually 3 general power, total reactive power of 1, mutually 3 mutually, thereby the frequency of watthour pulse and idle watthour pulse is to each sampling frequency:
The watthour pulsed frequency=(W1+W3) * sampling frequency }/the specified reference value of watthour (formula 13)
Idle watthour pulsed frequency=
(var1+var3) * sampling frequency }/the specified reference value of idle watthour (formula 14)
Therefore, according to the data that obtain in communication interface 383, calculate the pulsed frequency of electronic type watthour meter (being adjusted instrument) 100 with PC384, and can set specified reference value of watthour and the specified reference value of idle watthour, make the pulsed frequency of master meter 386 identical with the pulsed frequency of electronic type watthour meter (being adjusted instrument) 100.
The specified reference value of the specified reference value=watthour of watthour *
{ electronic type watthour meter pulsed frequency/master meter pulsed frequency } (formula 15)
The specified reference value of the idle watthour=specified reference value of idle watthour *
{ electronic type watthour meter pulsed frequency/master meter pulsed frequency } (formula 16)
Like this, calculate specified reference value of watthour and the specified reference value of idle watthour, and be set to electronic type watthour meter (being adjusted instrument) 100 by communication interface 382, thereby can adjust the watthour nominal load from PC 384.
Moreover, utilize the Hilbert transform device in specified reference value of watthour and the specified reference value of idle watthour, to guarantee 90 degree phase differential, then can make the specified reference value of idle watthour identical with the specified reference value of watthour, can reduce operand.
(3) then, carry out the phase place adjustment.
By communication interface 382 control dummy load power supplys 381, apply the power of rated power, power factor 0.5 from PC 384.Utilize pulse that pulse and the master meter 386 of watthour pulse efferent 136 output of electronic type watthour meter 100 export relatively, carry out the phase place adjustment.The ratio adjustment of the stepbystep counting of the output stepbystep counting of the electronic type watthour meter of exporting in the relatively available certain hour of pulse 100 and master meter 386 outputs, also the ratio adjustment of the pulsed frequency of the pulsed frequency of available electron formula watthour meter 100 outputs and master meter 386 outputs.
With mentioned above identical, the frequency of the pulsed frequency of electron gain formula watthour meter (being adjusted instrument) 100 and master meter 386 in PC384, and adjust by the coefficient that changes amplitude phase corrector 136, make this pulsed frequency identical with the frequency of master meter 386.The coefficient of the amplitude phase corrector of each phase of adjusted makes the amplitude of each phase and phase place obtain equilibrium in abovementioned (1), thereby the change of the coefficient of each phase, and its phase adjustment is identical.
Making the preceding amplitude phase correction coefficient of phase place adjustment of each phase is α _ n_pre, β _ n_pre, and the adjusted amplitude phase correction of phase place coefficient is α _ n_new, β _ n_new, and for example changes Δ φ, as the phase place adjustment, then
Wherein n represents each phase.
Utilize the power factor of institute's power input to be about 0.5 (because the precision problem of dummy load power supply 381 is inaccurate) this point, just can the evaluation phase adjustment amount.If the phase place of current electronic type watthour meter (being adjusted instrument) 100 is θ, then
(cos60ocos θ)/cos60o=(master meter frequencyelectronic type watthour meter frequency)
/ master meter frequency (formula 18)
So
θ=arcos{ electronic type watthour meter frequency/(master meter frequency * 2) } (formula 19)
Thereby be estimated as Δ φ=60oθ.
Also available other method of the estimation of phase adjustment is carried out, and abovementioned evaluation method is not unique.
(4) then, set the physical quantity conversion coefficient
By communication interface 382 control dummy load power supplys 381, apply the power of rated power, power factor 1.0 from PC 384.The operation result of utilization and high precision multimeter 388 is relatively set physical quantity conversion coefficient (W1a, W2a, W3a, Var1a, Var2a, Var3a).
Obtain the operation result of effective value voltage V1rms, V2rms and V3rms, effective value electric current I 1rms, I2rms and I3rms, power W1, W2, W3, Var1, Var2, Var3 from benchmark multimeter 388 by communication interface 382 by PC 384.Import the effective value voltage communication buffer 174 (174_1 of portion of each phase from electronic type watthour meter 100 by communication interface 382 by PC 384, the 174_2 (not shown), 174_3) with each effective value electric current communication buffer 184 (184_1 of portion mutually, the 184_2 (not shown), 184_3) with each 191 (191_1 of power communication buffer portion mutually, the 191_2 (not shown), data V1rms 191_3), V2rms and V3rms, I1rms, I2rms and I3rms, W1, W2, W3, Var1, Var2, Var3.
Set physical conversion coefficients by communication interface 382 at electronic type watthour meter (being adjusted instrument) 100 from PC384, as the data of the operation result/communication buffer device of benchmark multimeter.In effective value voltage and the effective value electric current, set this physical quantity conversion coefficient mutually respectively, the equilibrium adjustment of double as amplitude at each.In the power, the phase place of the amplitude of each phase is adjusted, thereby all is worth identically, needn't each set the physical quantity conversion coefficient mutually respectively.
The physical quantity conversion coefficient of reactive power is preferably implemented by the power of dummy load power supply 381 input rated power, power factor 0, if but utilize Hilbert transform to guarantee that the phase differential of electric current and voltage is 90 degree, just the physical quantity conversion coefficient with power is identical, no problem.
Therefore,, also can similarly adjust, thereby can formula adjust program sharingization with singlephase instrument even in polyphase meter, irrelevant with the phase line standard.In the polyphase meter, needn't each import rated power, power factor 1.0 and rated power, power factor 0.5 mutually, can make simplified equipment and shorten the adjustment time.
The electronic type watthour meter 100 of embodiment 7 constitutes can be from the whole adjusted values of external settingup, thereby certainly can be as the flat 1164402 communique of patent disclosure discloses, each imports rated power, power factor 1.0 and rated power, power factor 0.5 mutually, to adjust.
Embodiment 8
In the embodiment 7, put down in writing the situation that can only obtain watthour pulse and idle watthour pulse from master meter 386, but master meter 386 uses when having circuit watthour meter shown in Figure 20, adjust further and simplify.
Master meter 386 utilizes another high precision master meter (not shown) to be adjusted in advance.
By communication interface 382 control dummy load power supplys 381, apply the power of rated power, power factor 0.5 from PC384.Here, power factor also can be beyond 0.5, but when selecting the big power factor of the data variation of power and reactive power with respect to phase change, the precision that phase place is adjusted improves, thereby wishes that power factor is 0.5.
Here, by communication interface 382, the power communication buffer portion 191 (191_1,191_2 (not shown), 191_3) of each phase of electronic type watthour meter (being adjusted instrument) 100 and the data of each reactive power communication buffer portion 195 (195_1,195_2 (not shown), 195_3) mutually are input to PC384.By communication interface 382, the power communication buffer portion 191 of each phase and the data of each reactive power communication buffer portion 195 mutually are input to PC384 again from master meter 386.Connect owing to carry out singlephase 2 line values, the voltage of being imported, electric current are identical in each phase, so (W1, var1), (W2, var2), (W3, var3) Biao Shi coordinate must be identical, and owing to adjusting master meter 386 in advance, abovementioned coordinate is identical.Therefore, the coefficient of the amplitude phase corrector 130 (130_1,130_2 (not shown), 130_3) of each phase of adjustment electronic type watthour meter (being adjusted instrument) 100 makes the coordinate of electronic type watthour meter (being adjusted instrument) 100 consistent with the coordinate of master meter 386.The calculating of coefficient is identical with (1) of embodiment 7.
Because abovementioned coordinate is consistent with master meter 386, the nominal load adjustment can be read the specified reference value of master meter 386, and its former state is set in the electronic type watthour meter (being adjusted instrument) 100.Equally, but the physical quantity conversion coefficient of the physical quantity conversion coefficient of power, reactive power also former state be set to the physical quantity conversion coefficient of master meter 386 unchangeably.
Effective value voltage and effective value electric current, its adjustment is identical with (4) of embodiment 7.
Utilize above step, the adjustment when using circuit of the present invention (circuit shown in Figure 20) in the master meter 386 very precision is high and carry out at high speed.
Adjustment when using circuit of the present invention (circuit shown in Figure 20) in the master meter 386 also can make the coordinate of each phase consistent with master meter 386, thereby needs not to be singlephase 2 line systems connection certainly, also can be other connection.
Industrial practicality
The present invention can be used for electric current and voltage are carried out measuring after the A/D conversion electronic type watthour meter and the error method of adjustment thereof of watthour.And, according to the Power arithmetic circuit of electric current that is transformed into digital value and voltage operational power can be used in computational calculation power, reactive power, watthour and the idle watthour at least one device and according to the device of the corrected value of power and reactive power computing phase place and amplitude.
Claims (15)
1, a kind of electronic type watthour meter is characterized in that, comprises
To carrying out the voltage conversion circuit that A/D is transformed into digital value with the voltage after the transformer transformation,
To carrying out the current conversion circuit that A/D is transformed into digital value with the electric current after the current transformer unsteady flow,
The 1st voltagephase transformation component that the 1st angular phase conversion is only carried out in the output of described voltage conversion circuit,
The 2nd voltagephase transformation component that the 2nd angular phase conversion is only carried out in the output of described voltage conversion circuit,
The current phase transformation component that described the 1st angular phase conversion is only carried out in the output of described current conversion circuit,
With the output multiplication of described the 1st voltagephase transformation component and described current phase transformation component obtaining the active power operational part of active power,
With the output multiplication of described the 2nd voltagephase transformation component and described current phase transformation component obtaining the idle idle Power arithmetic portion of containing of containing power that comprises the reactive power component,
According to the voltage of described transformer and the described converter primary end voltage after to current and phase difference and A/D conversion to the phase deviation of current and phase difference, described active power and the described idle power that contains, the amplitude phase correction portion of the electric current after proofreading and correct the phase place of described active power and proofreading and correct described transformer and described converter primary end electric current and voltage and A/D conversion simultaneously and the amplitude excursion of voltage
With the output multiplication of this amplitude phase correction portion measuring the watthour measurement section of watthour, and
The watthour display that shows the watthour that described watthour measurement section is measured.
2, the electronic type watthour meter described in claim 1 is characterized in that,
The amplitude and the phase place of active power proofreaied and correct according to the active power and the idle idle power that contains that contains the output of Power arithmetic portion of amplitude excursion, phase deviation, the output of active power operational part by amplitude phase correction portion.
3, the electronic type watthour meter described in claim 1 or 2 is characterized in that,
Amplitude phase correction portion in transformer and current transformer when adjusting the electric current with the voltage of power supply input known amplitude and phase place and known amplitude and phase place,
Ask active power operational part and idle active power and the idle power that contains that contains the adjustment usefulness that Power arithmetic portion asked according to described adjustment with the input of power supply, and
According to these active power and idle theoretic active power and idle power that contains that contains power and utilize described known voltage, current known and the 2nd angle to try to achieve of adjusting usefulness, ask the correction coefficient of phase deviation and amplitude excursion.
4, the electronic type watthour meter described in claim 1 is characterized in that,
Amplitude phase correction portion has following each one:
The reference current storage part, by adjusting when importing the identical adjustment of each phase current and use electric current with power supply, store the output valve of a current conversion circuit output, storage simultaneously removes the coefficient of the output valve gained of other current conversion circuit output with the output valve of described current conversion circuit output;
The reference voltage storage part, by adjusting when importing the identical adjustment of each phase voltage and use voltage with power supply, store the output valve of a voltage conversion circuit output, storage simultaneously removes the coefficient of the output valve gained of other voltage conversion circuit output with the output valve of described voltage conversion circuit output;
Balanced adjustment part, when measuring watthour, with the output of described other current conversion circuit and the multiplication of described reference current storage portion stores, with the output of described other voltage conversion circuit and the multiplication of described reference voltage storage portion stores, output is balanced mutually to make each.
5, the electronic type watthour meter described in claim 1 or 4 is characterized in that, comprises
Storage is by adjusting the adjustment electric current storage part of using electric current with the adjustment of power supply input;
The reference current storage part, by adjusting when importing the identical adjustment of each phase current and use electric current with power supply, store the output valve of a current conversion circuit output, storage simultaneously removes the coefficient of the output valve gained of other current conversion circuit output with the output valve of described current conversion circuit output;
Current measurement portion, when measuring watthour, with the output valve of a current conversion circuit of the adjustment usefulness electric current of storing in the electric current storage part, described reference current storage portion stores and the coefficient of described each phase, ask the electric current of described each phase according to the output valve of described each phase current translation circuit output, described adjustment.
6, the electronic type watthour meter described in claim 5 is characterized in that,
Utilize the inching after the electric current of current measurement subordinate row side carries out coefficient storage.
7, as each described electronic type watthour meter in the claim 1,4～6, it is characterized in that, comprise
Storage is by adjusting the adjustment voltage storage part of using voltage with the adjustment of power supply input;
The reference voltage storage part, by adjusting when importing the identical adjustment of each phase voltage and use voltage with power supply, store the output valve of a voltage conversion circuit output, storage simultaneously removes the coefficient of the output valve gained of other voltage conversion circuit output with the output valve of described voltage conversion circuit output;
Voltage measurement portion, when measuring watthour, with the output valve of a voltage conversion circuit of the adjustment usefulness voltage of storing in the voltage storage part, described reference voltage storage portion stores and the coefficient of described each phase, ask the voltage of described each phase according to the output valve of described each phase voltage translation circuit output, described adjustment.
8, the electronic type watthour meter described in claim 1 is characterized in that,
The watthour measurement section is carried out time integral to the output of amplitude phase correction portion, and the computing watthour whenever this watthour reaches threshold value, is exported pulse, and had
Storage rated current, rated voltage, phase line standard, regulation to the specified storage part of the sampling frequency of the meter constant of the umber of pulse of measured watthour output and A/D conversion and
Full adjusted value operational part, this operational part is according to rated current, rated voltage, phase line standard and meter constant from described specified storage part input, the theoretical cycle of the pulse that the watthour measurement section produces when asking input rated power, and detect input output figure place from each sampling of amplitude phase correction portion during rated power, the value of this figure place and the gained that multiplies each other from the sampling frequency of described specified storage part input and described theoretical cycle is set at threshold value.
9, the electronic type watthour meter described in claim 3 is characterized in that,
Adjust power with power supply output rated voltage, rated current, power factor 1.0.
10, the electronic type watthour meter described in claim 1 is characterized in that,
The difference of the 1st angle and the 2nd angle is 90 degree, and the idle power that contains is reactive power.
11, a kind of electronic type watthour meter is characterized in that, comprises
To carrying out the voltage conversion circuit that A/D is transformed into digital value with the voltage after the transformer transformation,
To carrying out the current conversion circuit that A/D is transformed into digital value with the electric current after the current transformer unsteady flow,
The voltagephase transformation component that the 1st angular phase conversion is only carried out in the output of described voltage conversion circuit,
The 1st current phase transformation component that described the 1st angular phase conversion is only carried out in the output of described current conversion circuit,
The 2nd current phase transformation component that the 2nd angular phase conversion is only carried out in the output of described current conversion circuit,
With the output multiplication of described voltagephase transformation component and described the 1st current phase transformation component obtaining the active power operational part of active power,
With the output multiplication of described voltagephase transformation component and described the 2nd current phase transformation component obtaining the idle idle Power arithmetic portion of containing of containing power that comprises the reactive power component,
According to the voltage of described transformer and the described converter primary end voltage after to current and phase difference and A/D conversion to the phase deviation of current and phase difference, described active power and the described idle power that contains, proofread and correct the phase place of described active power, proofread and correct the amplitude phase correction portion of the amplitude excursion of electric current after described transformer and described converter primary end electric current and voltage and the A/D conversion and voltage simultaneously
With the output multiplication of this amplitude phase correction portion measuring the watthour measurement section of watthour, and
The watthour display that shows the watthour that described watthour measurement section is measured.
12, a kind of electronic type watthour meter error method of adjustment is characterized in that,
This electronic type watthour meter has carrying out the voltage conversion circuit that A/D is transformed into digital value with the voltage after the transformer transformation, to carrying out the current conversion circuit that A/D is transformed into digital value with the electric current after the current transformer unsteady flow, with the output multiplication of voltage conversion circuit and current conversion circuit to obtain the active power operational part of active power, to make the output multiplication of the output of output delay 90 degree of described voltage conversion circuit and described current conversion circuit to obtain the reactive power operational part of reactive power, the watthour measurement section of output pulse when the value of the output multiplication gained of described active power operational part is surpassed threshold value, and the watthour display that shows the watthour that described watthour measurement section is measured, this error method of adjustment comprises following each step:
The rated power input step connects on the electronic type watthour meter to adjust and uses power supply, is 1.0 with power supply to whole rated power of input mutually and power factor from this adjustment;
Balanced setup procedure, obtain the voltage of described voltage conversion circuit output and the ratio of the voltage of other voltage conversion circuit output, and utilize this than inverse the coefficient of each phase voltage equilibrium is stored when measuring, obtain the ratio of the electric current of the electric current of described current conversion circuit output and the output of other current conversion circuit simultaneously, and utilize this than inverse the coefficient of each phase current equilibrium is stored when measuring;
Phase place is adjusted shift step, according to the active power that obtains from described active power operational part and described reactive power operational part and reactive power, described adjustment active power and the reactive power with power supply output, the voltage of the voltage of obtaining described transformer and described converter primary end after to current and phase difference and A/D conversion is also stored the phase deviation of current and phase difference;
Input step, input rated current, rated voltage, phase line standard, the described watthour measurement section of regulation are to the meter constant of the umber of pulse of measured watthour output and the sampling frequency of A/D conversion;
Full adjusted value calculation step is set threshold value to described watthour operational part.
13, a kind of electronic type watthour meter error method of adjustment is characterized in that,
This electronic type watthour meter is heterogeneous electronic type watthour meter, have carrying out the voltage conversion circuit that A/D is transformed into digital value with the voltage after the transformer transformation, to carrying out the current conversion circuit that A/D is transformed into digital value with the electric current after the current transformer unsteady flow, with the output multiplication of voltage conversion circuit and current conversion circuit to obtain the active power operational part of active power, to make the output multiplication of the output of output delay 90 degree of described voltage conversion circuit and described current conversion circuit to obtain the reactive power operational part of reactive power, the watthour measurement section of output pulse when the value of the output multiplication gained of described active power operational part is surpassed threshold value, and the watthour display that shows the watthour that described watthour measurement section is measured, this error method of adjustment comprises following each step:
The rated power input step connects adjustment and uses power supply on the electronic type watthour meter, each alternate singlephase 2 line is connected, and adjusts with the power supply amount of imports from this and decides power and the power factor for stipulating;
Amplitude phase place setup procedure according to the output of described Power arithmetic portion and described reactive power operational part, is obtained the computing adjustment that utilizes rotation matrix and is made the power and power and the reactive power consistent coefficient of reactive power with other phase of a described phase;
The nominal load setup procedure, the watthour pulse of described electronic type watthour meter is output as benchmark, makes to connect ground from each mutually singlephase 2 line and connect described adjustment and export consistent with the watthour output of master meter power supply, that accurately adjust the pulse output of watthour with the watthour pulse from this electronic type watthour meter;
The phase place trim step after the adjustment of described amplitude phase place setup procedure and described nominal load setup procedure, according to from the input of described adjustment with power supply, is finely tuned the phase place of described electronic type watthour meter.
14, a kind of electronic type watthour meter error method of adjustment is characterized in that,
This electronic type watthour meter is heterogeneous electronic type watthour meter, has carrying out the voltage conversion circuit that A/D is transformed into digital value with the voltage after the transformer transformation, to carrying out the current conversion circuit that A/D is transformed into digital value with the electric current after the current transformer unsteady flow, with the output multiplication of voltage conversion circuit and current conversion circuit to obtain the active power operational part of active power, to make the output multiplication of the output of output delay 90 degree of described voltage conversion circuit and described current conversion circuit to obtain the reactive power operational part of reactive power, the watthour measurement section of output pulse when the value of the output multiplication gained of described active power operational part is surpassed threshold value, and the watthour display that shows the watthour that described watthour measurement section is measured;
Master meter also has described voltage transformating part, current transformation portion, active power operational part, reactive power operational part and the watthour measurement section equal with described electronic type watthour meter, and is subjected to the high precision adjustment in advance;
When applying regulation power, Power arithmetic portion and reactive power operational part power input and reactive power by described electronic type watthour meter, on the other hand, Power arithmetic portion and reactive power operational part input power and reactive power at this moment from described master meter, and the amplitude phase coefficient of adjustment electronic type watthour meter, make the power of described electronic type watthour meter consistent with the power and the reactive power of described master meter with reactive power.
15, a kind of Power arithmetic circuit is characterized in that, comprises
The voltage input part of the voltage after the input digit conversion,
The electric current input part of the electric current after the input digit conversion,
The 1st voltagephase transformation component that the 1st angular phase conversion is only carried out in the output of described voltage input part,
The 2nd voltagephase transformation component that the 2nd angular phase conversion is only carried out in the output of described voltage input part,
The current phase transformation component that the 1st angular phase conversion is only carried out in the output of described electric current input part,
With the output multiplication of described the 1st voltage transformating part and described current phase transformation component obtaining the active power operational part of active power,
With the output multiplication of described the 2nd voltage transformating part and described current phase transformation component obtaining the idle idle Power arithmetic portion of containing of containing power that comprises the reactive power component, and
According to theoretical value and the phase deviation of operation values, described active power and the described idle power that contains, proofread and correct the phase correction portion of described active power to the described voltage of described electric current.
Priority Applications (2)
Application Number  Priority Date  Filing Date  Title 

PCT/JP2002/000045 WO2003060540A1 (en)  20020109  20020109  Electronic watthour meter, error adjusting method therefor and power computing circuit 
JPPCT/JP02/00045  20020109 
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CN1620613A true CN1620613A (en)  20050525 
CN100346166C CN100346166C (en)  20071031 
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JP (1)  JP4193697B2 (en) 
CN (1)  CN100346166C (en) 
AU (1)  AU2002219566A1 (en) 
WO (2)  WO2003060540A1 (en) 
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CN102169138A (en) *  20100226  20110831  上海科能电气科技有限公司  Method for processing correction of phase difference of power grid test or counting device 
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CN103149546A (en) *  20121130  20130612  河南工业大学  Portable electric energy measuring terminal comprehensive calibration instrument on site 
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2002
 20020109 AU AU2002219566A patent/AU2002219566A1/en not_active Abandoned
 20020109 WO PCT/JP2002/000045 patent/WO2003060540A1/en unknown
 20021226 WO PCT/JP2002/013623 patent/WO2003060531A1/en active Application Filing
 20021226 JP JP2003560574A patent/JP4193697B2/en active Active
 20021226 CN CNB028280474A patent/CN100346166C/en not_active IP Right Cessation
Cited By (10)
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CN102169138A (en) *  20100226  20110831  上海科能电气科技有限公司  Method for processing correction of phase difference of power grid test or counting device 
CN103069285B (en) *  20100707  20150225  奥秘系统有限公司  Bidirectional digital power meter 
CN103069285A (en) *  20100707  20130424  奥秘系统有限公司  Bidirectional digital power meter 
CN102087350A (en) *  20110113  20110608  中国电力科学研究院  Sine reactive power calibration system 
CN103149546A (en) *  20121130  20130612  河南工业大学  Portable electric energy measuring terminal comprehensive calibration instrument on site 
CN103149546B (en) *  20121130  20160302  河南工业大学  The field integrated tester of a kind of portable electric energy measuring terminal 
CN103364630A (en) *  20130723  20131023  上海申瑞继保电气有限公司  Asynchronous load acquisition modification method for partial electricity utilization 
CN103364630B (en) *  20130723  20150909  上海申瑞继保电气有限公司  The asynchronous collection loading correcting method of subitem electricity consumption 
CN103713686A (en) *  20131231  20140409  上海贝岭股份有限公司  Smallsignal power correcting circuit 
CN103713686B (en) *  20131231  20150408  上海贝岭股份有限公司  Smallsignal power correcting circuit 
Also Published As
Publication number  Publication date 

AU2002219566A1 (en)  20030730 
WO2003060531A1 (en)  20030724 
JPWO2003060531A1 (en)  20050519 
JP4193697B2 (en)  20081210 
CN100346166C (en)  20071031 
WO2003060540A1 (en)  20030724 
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