CN107807345A - A kind of Three Phase Alternating-current Electrical Energy Meters verification system and method - Google Patents
A kind of Three Phase Alternating-current Electrical Energy Meters verification system and method Download PDFInfo
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- CN107807345A CN107807345A CN201711111613.2A CN201711111613A CN107807345A CN 107807345 A CN107807345 A CN 107807345A CN 201711111613 A CN201711111613 A CN 201711111613A CN 107807345 A CN107807345 A CN 107807345A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/04—Testing or calibrating of apparatus covered by the other groups of this subclass of instruments for measuring time integral of power or current
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
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Abstract
The invention discloses a kind of Three Phase Alternating-current Electrical Energy Meters verification system, including main control unit, power subsystem, standard electric energy meter unit and at least one calibrating unit, calibrating unit includes electric energy meter type identification unit, tested electric energy meter and error calculation unit；Power subsystem is used to provide power supply for tested electric energy meter and standard electric energy meter unit, and standard electric energy meter unit is used to provide standard phase three-wire three electrical energy impulse signals and standard three-phase and four-line electrical energy impulse signals；Additionally provide a kind of Three Phase Alternating-current Electrical Energy Meters calibration method.A kind of Three Phase Alternating-current Electrical Energy Meters verification system of the present invention realizes the automatic identification of electric energy meter type using electric energy meter type identification unit, improves the calibrating efficiency of Three Phase Alternating-current Electrical Energy Meters.The type that a kind of Three Phase Alternating-current Electrical Energy Meters calibration method is tested electric energy meter by automatic decision improves the calibrating efficiency of three-phase electric energy meter to complete verifying process flow, realizes intelligent.
Description
Technical field
The present invention relates to electric energy meter calibration field, especially a kind of Three Phase Alternating-current Electrical Energy Meters verification system and method.
Background technology
Usually, Three Phase Alternating-current Electrical Energy Meters are divided into two kinds of phase three-wire three AC energy meter and three-phase and four-line AC energy meter,
Because their mode of connection is different, for measurement signal it is also different, the measurement signal of phase three-wire three AC energy meter is three
The line signal of phase three；And the measurement signal of three-phase and four-line AC energy meter is three-phase and four-line signal；Therefore, at present, to three-phase alternating current
, it is necessary to be tested type (phase three-wire three AC energy meter or the three-phase of electric energy meter by manual identified when electric energy meter is examined and determine
Four line AC energy meters), then select corresponding measurement signal access Three Phase Alternating-current Electrical Energy Meters and it is examined and determine；For three
The verification process of cross streams electric energy meter needs manually to participate in, and calibrating efficiency is low.
The content of the invention
In order to solve the above-mentioned technical problem, it is an object of the invention to provide a kind of Three Phase Alternating-current Electrical Energy Meters verification system and side
Method, for improving the calibrating efficiency of Three Phase Alternating-current Electrical Energy Meters.
The technical solution adopted in the present invention is：A kind of Three Phase Alternating-current Electrical Energy Meters verification system, including main control unit, electricity
Source unit, standard electric energy meter unit and at least one calibrating unit, the calibrating unit include electric energy meter type identification unit, quilt
Survey electric energy meter and error calculation unit；The power subsystem is used to provide power supply for tested electric energy meter and standard electric energy meter unit,
The standard electric energy meter unit is used to provide standard phase three-wire three electrical energy impulse signals and standard three-phase and four-line electrical energy impulse signals；
The main control unit connects with power subsystem, electric energy meter type identification unit, standard electric energy meter unit, error calculation unit respectively
Connect；The power subsystem is connected with electric energy meter type identification unit；The output end of the power subsystem respectively with standard electric energy meter
The input connection of the input of unit, tested electric energy meter；The electric energy meter type identification unit is connected with tested electric energy meter；Institute
State the input connection of the output end of tested electric energy meter, the output end of standard electric energy meter unit and error calculation unit.
Further, the electric energy meter type identification unit includes the first governor circuit and identification circuit, first master
Control circuit is connected with power subsystem, main control unit, and the output end of the power subsystem passes through identification circuit and tested electric energy meter
Input connection, the output end of the identification circuit is connected with the input of the first governor circuit.
Further, the identification circuit includes current transformer and first resistor, the current transformer it is primary around
One end of group and the output end of power subsystem connect, and the other end of the armature winding of the current transformer connects with tested electric energy meter
Connect, one end ground connection of the secondary windings of the current transformer, the other end of the secondary windings of the current transformer and first
One end connection of resistance, the other end of the first resistor are connected with the input of the first governor circuit.
Further, the power subsystem includes power circuit and multrirange current generating circuit, and the power circuit is used
In generation current and voltage signals；The main control unit is connected with power circuit, the electric energy meter type identification unit and volume
Journey current generating circuit is connected, and the electric energy meter type identification unit is connected with power circuit, multrirange current generating circuit, institute
State the output end of power circuit and the input of standard electric energy meter unit, the input of tested electric energy meter are connected, the multrirange
The output end of current generating circuit is connected with the input of tested electric energy meter.
Further, the multrirange current generating circuit includes multiple transforming circuits, and the transforming circuit includes transformation
Device, the first controlling switch and the second controlling switch, the output end of the power circuit and the primary coil of transformer connect, described
One end of first secondary coil of transformer is connected with the first connection end of the first controlling switch, and the of first controlling switch
Two connection ends, the other end of the first secondary coil of transformer are connected with the input of tested electric energy meter；The of the transformer
One end of secondary stage coil is connected with the first connection end of the second controlling switch, the second connection end of second controlling switch with
The second connection end connection of first controlling switch, the other end of the second subprime coil of the transformer and the first secondary coil
The other end connects；The control terminal of the electric energy meter type identification unit and the first controlling switch, the control terminal of the second controlling switch
Connection.
Further, the standard electric energy meter unit includes the second governor circuit, sample circuit and pulse-generating circuit；Institute
Main control unit is stated to be connected with the second governor circuit；The output end of the power subsystem and the input of sample circuit connect；Institute
The output end for stating sample circuit is connected with the input of the second governor circuit；The output end of second governor circuit is produced with pulse
The input connection of raw circuit；The output end of the pulse-generating circuit and the input of error calculation unit connect.
Further, main pulse generation circuit and the 3rd governor circuit, the master control when error calculation unit includes
Unit is connected with the 3rd governor circuit, the output end of main pulse generation circuit, output end, the standard electric of tested electric energy meter when described
The output end of energy table unit is connected with the input of the 3rd governor circuit.
Further, the Three Phase Alternating-current Electrical Energy Meters verification system also includes display unit, the main control unit it is defeated
Go out the output end at end and/or standard electric energy meter unit and the input of display unit connects.
Another technical scheme of the present invention is：A kind of Three Phase Alternating-current Electrical Energy Meters calibration method, applied to described
Three Phase Alternating-current Electrical Energy Meters verification system, comprises the following steps：
Obtain the inspection of predeterminated voltage parameter, the preset control parameters of standard electric energy meter unit, at least one tested electric energy meter
Determine parameter to establish the tested electric energy meter database of main control unit, the tested electric energy meter database include tested electric energy meter with
The corresponding relation of corresponding verification parameters, the predeterminated voltage parameter are used to control power subsystem to export default voltage signal；
The preset control parameters are used for the reference power supply signal for controlling power subsystem to produce input standard electric energy meter unit；The calibrating
Parameter is used for the calibrating power supply signal for controlling power subsystem to produce the tested electric energy meter of input；
The main control unit exports the voltage signal to described according to the predeterminated voltage state modulator power subsystem
Tested electric energy meter；
Electric energy meter type identification unit judges the type of the tested electric energy meter and the type information is returned into main control
Unit；
The main control unit controls power supply list according to the tested electric energy meter with the corresponding relation of corresponding verification parameters
Member produces the calibrating power supply signal；The tested electric energy meter produces tested electrical energy pulse letter according to the calibrating power supply signal
Number；
The main control unit controls power subsystem to produce the reference power supply signal, institute according to the preset control parameters
State standard electric energy meter unit and standard phase three-wire three electrical energy impulse signals and standard three-phase four are produced according to the reference power supply signal
Line electrical energy impulse signals；
The error calculation unit is according to the type information selection standard phase three-wire three electrical energy impulse signals or standard three
The line electrical energy impulse signals of phase four are as standard electrical energy impulse signals, according to the standard electrical energy impulse signals and tested electrical energy pulse
Signal of change error completes calibrating.
Further, the electric energy meter type identification unit judges that the method for the type of tested electric energy meter is：
Whether detect that electric current judges the type of tested electric energy meter according to identification circuit, when identification circuit detects electric current
When, judge the tested electric energy meter for three-phase and four-line electric energy meter；Otherwise, judge the tested electric energy meter for phase three-wire three electric energy
Table.
Further, the standard electric energy meter unit produces standard phase three-wire three electric energy arteries and veins according to the reference power supply signal
The method for rushing signal and standard three-phase and four-line electrical energy impulse signals is：
The input signal of power subsystem described in sampling circuit samples is mutually electric corresponding to the three-phase of the input signal to obtain
Pressure, phase current signal；
Second governor circuit phase voltage, phase current signal control pulse-generating circuit according to corresponding to the three-phase produce mark
Quasi- three-phase and four-line electrical energy impulse signals and standard phase three-wire three electrical energy impulse signals.
The beneficial effects of the invention are as follows：
A kind of Three Phase Alternating-current Electrical Energy Meters verification system of the present invention, including main control unit, power subsystem, standard electric energy meter list
First and at least one calibrating unit, calibrating unit include electric energy meter type identification unit, tested electric energy meter and error calculation unit；
Power subsystem is used to provide power supply for tested electric energy meter and standard electric energy meter unit, and standard electric energy meter unit is used to provide standard three
The line electrical energy impulse signals of phase three and standard three-phase and four-line electrical energy impulse signals；The calibrating of Three Phase Alternating-current Electrical Energy Meters can be realized, its
In, the automatic identification of electric energy meter type is realized using electric energy meter type identification unit, improves the calibrating of Three Phase Alternating-current Electrical Energy Meters
Efficiency.In addition, a kind of Three Phase Alternating-current Electrical Energy Meters calibration method obtains the class of tested electric energy meter by electric energy meter type identification unit
After type, main control unit produces calibrating according to tested electric energy meter with the corresponding relation control power subsystem of corresponding verification parameters
Power supply signal；Tested electric energy meter produces tested electrical energy impulse signals according to calibrating power supply signal；Main control unit is according to default control
State modulator power subsystem processed produces reference power supply signal, and standard electric energy meter unit produces standard three-phase according to reference power supply signal
Three line electrical energy impulse signals and standard three-phase and four-line electrical energy impulse signals；Finally, error calculation unit is according to tested electric energy meter
The corresponding standard electrical energy impulse signals of type selecting carry out error calculation to tested electrical energy impulse signals, complete three-phase electric energy meter
Calibrating, automatic decision are tested the type of electric energy meter and then complete verifying process flow, improve the calibrating efficiency of three-phase electric energy meter, realize
It is intelligent.
Brief description of the drawings
The embodiment of the present invention is described further below in conjunction with the accompanying drawings：
Fig. 1 is an a kind of specific embodiment structured flowchart of Three Phase Alternating-current Electrical Energy Meters verification system of the present invention；
Fig. 2 is a kind of specific embodiment structural frames of the power subsystem of Three Phase Alternating-current Electrical Energy Meters verification system of the present invention
Figure；
Fig. 3 is an a kind of specific embodiment schematic diagram of Three Phase Alternating-current Electrical Energy Meters verification system of the present invention；
Fig. 4 is an a kind of specific implementation of the multrirange current generating circuit of Three Phase Alternating-current Electrical Energy Meters verification system of the present invention
Example circuit diagram；
Fig. 5 is an a kind of specific embodiment knot of the standard electric energy meter unit of Three Phase Alternating-current Electrical Energy Meters verification system of the present invention
Structure block diagram；
Fig. 6 is an a kind of specific embodiment circuit diagram of the identification circuit of Three Phase Alternating-current Electrical Energy Meters verification system of the present invention.
Embodiment
It should be noted that in the case where not conflicting, the feature in embodiment and embodiment in the application can phase
Mutually combination.
A kind of Three Phase Alternating-current Electrical Energy Meters verification system, with reference to figure 1, Fig. 1 is a kind of Three Phase Alternating-current Electrical Energy Meters calibrating of the present invention
One specific embodiment structured flowchart of system, including main control unit, power subsystem, standard electric energy meter unit and at least one inspection
Order member, calibrating unit include electric energy meter type identification unit, tested electric energy meter and error calculation unit；Power subsystem is used for
Tested electric energy meter and standard electric energy meter unit provide power supply, wherein, tested electric energy meter is used to export tested electrical energy impulse signals, marks
Quasi- power meter unit is used to provide standard phase three-wire three electrical energy impulse signals and standard three-phase and four-line electrical energy impulse signals；Main control
Unit is used for the Master Control Center as Three Phase Alternating-current Electrical Energy Meters verification system；Error calculation unit be used for calculate tested electric energy meter with
Error between standard electric energy meter unit；Main control unit respectively with power subsystem, electric energy meter type identification unit, standard electric energy
Table unit, error calculation unit connection；Power subsystem is connected with electric energy meter type identification unit；The output end difference of power subsystem
Input, the input of tested electric energy meter with standard electric energy meter unit are connected；Electric energy meter type identification unit and tested electric energy
Table connects；The input of the output end of tested electric energy meter, the output end of standard electric energy meter unit and error calculation unit connects.
A kind of Three Phase Alternating-current Electrical Energy Meters verification system of the present invention, including main control unit, power subsystem, standard electric energy meter list
First and at least one calibrating unit, calibrating unit include electric energy meter type identification unit, tested electric energy meter and error calculation unit；
Power subsystem is used to provide power supply for tested electric energy meter and standard electric energy meter unit, and standard electric energy meter unit is used to provide standard three
The line electrical energy impulse signals of phase three and standard three-phase and four-line electrical energy impulse signals；Tested electric energy meter produces tested electrical energy impulse signals,
The calibrating of Three Phase Alternating-current Electrical Energy Meters can be then realized using error calculation unit, wherein, it is real using electric energy meter type identification unit
The automatic identification of existing electric energy meter type, improve the calibrating efficiency of Three Phase Alternating-current Electrical Energy Meters.
With reference to figure 3, Fig. 3 is an a kind of specific embodiment schematic diagram of Three Phase Alternating-current Electrical Energy Meters verification system of the present invention；This
In embodiment, main control unit is PC, it is possible to achieve man-machine interaction, controls whole verifying process flow, exports and show calibrating knot
Fruit；And multi-channel serial port server is configured to connect the other parts in Three Phase Alternating-current Electrical Energy Meters verification system, as shown in figure 3, PC
Machine is realized by the other parts of communicate wire harness and Three Phase Alternating-current Electrical Energy Meters verification system and communicated to connect.In the present embodiment, three-phase
AC energy meter verification system includes multiple calibrating units, and each unit of examining and determine includes electric energy meter type identification unit, one
Individual tested electric energy meter and an error calculation unit, such as the first calibrating unit, including it is electric energy meter type identification unit 1#, tested
Electric energy meter 1# and error calculation unit 1#, each unit of examining and determine configure an electric energy meter type identification unit and error calculation unit
For examining and determine a tested electric energy meter, it can so accelerate the calibrating speed of Three Phase Alternating-current Electrical Energy Meters；In fact, multiple calibratings are single
An electric energy meter type identification unit and error calculation unit, but the calibrating speed of Three Phase Alternating-current Electrical Energy Meters can be shared between member
It can decrease.
As the further improvement of technical scheme, referring to figs. 2 and 3 Fig. 2 is a kind of Three Phase Alternating-current Electrical Energy Meters inspection of the present invention
Determine a specific embodiment structured flowchart of the power subsystem of system；Fig. 3 is a kind of Three Phase Alternating-current Electrical Energy Meters verification system of the present invention
A specific embodiment schematic diagram；Power subsystem includes power circuit and multrirange current generating circuit, and power circuit is used to produce
Raw current and voltage signals；Main control unit is connected with power circuit, and power circuit is connected with multrirange current generating circuit, electric energy
Table type identification unit is connected with power circuit, multrirange current generating circuit, the output end and standard electric energy meter of power circuit
The input connection of the input of unit, tested electric energy meter, the output end of multrirange current generating circuit and tested electric energy meter
Input connects.In the present embodiment, power circuit is realized using program controled power source, can be generated according to the instruction of PC corresponding
Three-phase and four-line voltage and current signal, or the voltage signal for identification；PC and program controled power source, standard electric energy meter unit, electricity
Can communicate to connect between table type identification unit, program controled power source and multrirange current generating circuit, standard electric energy meter unit it
Between by primary current wire harness realize that electric current transmits, the output end of program controled power source passes through voltage wire harness and standard electric energy meter unit
Input, the input of tested electric energy meter, the connection of electric energy meter type identification unit realize that voltage transmits, electric energy meter type identification
Unit is connected with multrirange current generating circuit by primary current wire harness realizes electric current transmission to control multrirange electric current to produce
The size of current of circuit output, multrirange current generating circuit output current to tested electric energy meter by primary current wire harness, i.e.,
The instruction control multrirange current generating circuit that electric energy meter type identification unit receives PC is exported to the electric current of tested electric energy meter
Size.
Further, it is a kind of multrirange electricity of Three Phase Alternating-current Electrical Energy Meters verification system of the present invention with reference to figure 2 and Fig. 4, Fig. 4
Flow a specific embodiment circuit diagram of generation circuit；Multrirange current generating circuit includes multiple transforming circuits, multiple change piezoelectricity
The structure on road is identical.Illustrate the structure of transforming circuit by taking first transforming circuit as an example, the first transforming circuit includes the first transformation
Device U1, the first controlling switch and the second controlling switch, in the present embodiment, the first controlling switch and the second controlling switch use relay
Device realizes that i.e. the first controlling switch is relay 1, the second controlling switch is relay 2；The output end and transformation of power circuit
Device U1 primary coil T0 connections with by the three-phase current signal of power circuit input the first transforming circuit, the first transformer U1's
First secondary coil T1 one end is connected with the first main contacts connection end of relay 1, the second main contacts connection of relay 1
End, the first transformer U1 the first secondary coil T1 the other end be connected with the input of tested electric energy meter with output current to by
Survey in electric energy meter；First transformer U1 second subprime coil T2 one end is connected with the first main contacts connection end of relay 2,
Second main contacts connection end of relay 2 is connected with the second main contacts connection end of relay 1, second of the first transformer U1
The level coil T2 other end is connected with the first secondary coil T1 other end；The control of electric energy meter type identification unit and relay 1
Control terminal (i.e. coil connecting terminal) connection of end (i.e. coil connecting terminal), relay 2 processed.Multrirange current generating circuit is used to produce
Raw different size of electric current realizes the calibrating to being tested electric energy meter under different current conditions to input in tested electric energy meter.This reality
Apply in example, multrirange current generating circuit includes multiple transforming circuits, and the number of turn of the transformer of each transforming circuit is different, can be with
Realize and the current signal of power circuit input is converted into current signal of different sizes.And electric energy meter type identification unit can be defeated
Go out the shut-off of control signal control relay, and then the connection of corresponding current path can be selected to export corresponding electric current to tested
In electric energy meter.With reference to figure 4, transforming circuit also includes compensation circuit, and in the present embodiment, each transforming circuit includes two compensation electricity
Road.By taking the first transforming circuit as an example, corresponding first compensation circuit is arranged at the first transformer U1 the first secondary coil T1's
Between one end and the first main contacts connection end of relay 1；Second compensation circuit sets the second subprime with the first transformer U1
Between coil T2 one end and the first main contacts connection end of relay 2, compensation circuit is set to be used for the electricity for improving transforming circuit
Flow precision.
As the further improvement of technical scheme, standard electric energy meter unit includes the second governor circuit, sample circuit and arteries and veins
Rush generation circuit；Main control unit is connected with the second governor circuit；The output end of power subsystem and the input of sample circuit connect
Connect；The output end of sample circuit is connected with the input of the second governor circuit；The output end and pulses generation of second governor circuit
The input connection of circuit；The output end of pulse-generating circuit and the input of error calculation unit connect.With reference to figure 3 and Fig. 5,
Fig. 5 is an a kind of specific embodiment structured flowchart of the standard electric energy meter unit of Three Phase Alternating-current Electrical Energy Meters verification system of the present invention；
In the present embodiment, the second governor circuit is realized using single-chip microcomputer main control module and analog-to-digital conversion module, analog-to-digital conversion module with
Single-chip microcomputer main control module connects, and single-chip microcomputer main control module realizes and communicated to connect that PC can lead to by PC communication interfaces and PC
Communication interface is crossed to obtain measurement data and send setup parameter；Sample circuit is realized to program control power using current sample module
The three-phase current signal of source input sampling circuit is sampled, and the three-phase and four-line electricity of program controled power source input analog-to-digital conversion module
Signal and the current signal obtained through current sample module are pressed, data signal input single-chip microcomputer is changed into by analog-to-digital conversion module
Main control module；Pulse-generating circuit includes the first pulse generation module and the second pulse generation module, single-chip microcomputer main control module
Output end is connected with the input of the first pulse generation module, the input of the second pulse generation module；Data signal is by single
Piece machine main control module calculates generation phase three-wire three electric energy and three-phase and four-line electric energy, then generates standard three by pulse-generating circuit
The line electrical energy impulse signals of phase four and standard phase three-wire three electrical energy impulse signals error originated from input computing unit.
As the further improvement of technical scheme, electric energy meter type identification unit includes the first governor circuit and identification electricity
Road, the first governor circuit are connected with power subsystem, main control unit, specifically, with reference to figure 3, the first governor circuit and power supply list
The multrirange current generating circuit of member connects the output current for controlling multrirange current generating circuit to input control signal to be used for
Size, main control unit are that PC and the first governor circuit are communicated to connect to input control parameter to the first governor circuit, first
Master Control Center of the governor circuit as electric energy meter type identification unit, for controlling power subsystem to tested electric energy meter making alive
Signal and control identification circuit are started working；The output end of power subsystem passes through identification circuit and the input of tested electric energy meter
Connection, when identification circuit is connected for power subsystem with tested electric energy meter, obtain electric energy meter identification signal；The output of identification circuit
End is connected with the input of the first governor circuit carries out electric energy meter class into the first governor circuit with inputing power table identification signal
Type identifying processing judges.
Further, with reference to figure 6, Fig. 6 is the one of a kind of identification circuit of Three Phase Alternating-current Electrical Energy Meters verification system of the present invention
Specific embodiment circuit diagram；Specifically, the principle of identification circuit is：If three-phase three-wire electric energy meter, according to its internal structure,
Un terminals are sky, are open circuit between Ua, Ub, Uc signal wire and Un, when power subsystem is to electric energy meter making alive, identification circuit inspection
Electric current is not detected；If three-phase and four-line electric energy meter, there is impedance in Ua, Ub, Uc signal wire and Un, when applying voltage, identification electricity
Road can detect curent change, and the variable signal of the voltage of identification circuit is electric energy meter identification signal, and electric energy meter is identified and believed
Number report the first governor circuit to carry out processing to judge the automatic identification judgement of connection box of electric energy meter mode can be achieved.In addition, first
Governor circuit can realize that electric energy meter identification signal becomes numeral after A/D is changed using single-chip microcomputer and its peripheral circuit
Signal, single-chip microcomputer can be three by judging whether the data signal is zero to judge being which kind of electric energy meter, when voltage is zero
Phase three-wire electric energy meter；Then it is three-phase and four-line electric energy meter when voltage is more than zero.
With reference to figure 6, identification circuit includes current transformer T0 and first resistor R1, current transformer T0 armature winding
The output end Un of the program controled power source of one end and power subsystem (program controled power source is carried out equivalent with the power source isoboles in Fig. 6)
Connection, ((1) and (2) in such as Fig. 6, (1) illustrate meaning to the other end of current transformer T0 armature winding with tested electric energy meter
It is the isoboles of three-phase and four-line electric energy meter, (2) figure illustrates that three-phase three-wire electric energy meter isoboles) connection, current transformer T0
Secondary windings one end ground connection, the other end of current transformer T0 secondary windings is connected with first resistor R1 one end, the
The one resistance R1 other end is connected with the input of the first governor circuit.
Wherein, in Fig. 6 (1)：When accessing three-phase and four-line electric energy meter, voltage is added between Ua, Ub or Uc and Un,
Electric current Ir can be produced at Un, induced-current Idetc, Idetc can be produced at A through current transformer T0 flows through first resistor R1
Vdetc can be detected at B>0；
In Fig. 6 (2)：When accessing three-phase three-wire electric energy meter, voltage is added between Ua, Ub or Uc and Un, due to
Un open circuit no currents, also non-inductive electric current at A, voltage Vdetc=0 at B.
Voltage change signal when tested electric energy meter is applied in voltage is obtained by identification circuit, and by voltage change signal
Input and processing judgement is carried out in the first governor circuit, realize the type automatic identification of tested electric energy meter, and then improve verification system
Calibrating efficiency.The tested electric energy meter no matter accessed as shown in Figure 6 is three-phase three-wire electric energy meter, or three-phase and four-line electric energy meter,
Three-phase and four-line power supply need to be only provided electric energy meter type identification can be achieved.
As the further improvement of technical scheme, with reference to figure 3, main pulse generation circuit and when error calculation unit includes
Three governor circuits, the 3rd governor circuit are used to calculate gauging error as the Master Control Center of error calculation unit；Main control unit with
3rd governor circuit connects, when the output end of main pulse generation circuit, the output end of tested electric energy meter, standard electric energy meter unit
Output end is connected with the input of the 3rd governor circuit.In the present embodiment, when main pulse generation circuit include GPS controllers and essence
Mi Shiji sources, the output end of GPS controllers with it is accurate when Ji Yuan input be connected, when accurate Ji Yuan output end with the 3rd master
Control the input connection of circuit；GPS controllers be used for obtain satellite-signal with for precision when Ji Yuan clock pulse per second (PPS) is provided；It is accurate
Shi Jiyuan is used for main pulse signal when producing, when main pulse signal be used for the 3rd governor circuit and carry out error testing.Tested electric energy
Table inputs tested electrical energy impulse signals to the 3rd governor circuit, and standard electric energy meter inputs standard electric energy to the 3rd governor circuit
Pulse signal, main pulse signal, tested electrical energy impulse signals and standard electrical energy impulse signals are real when the 3rd governor circuit utilizes
Now it is tested the error calculation of electric energy meter；The error information being calculated is carried out defeated by communication network transmission to main control unit
Go out.With reference to figure 3, verification system includes multiple calibrating units, and each unit of examining and determine configures an error calculation unit, wherein, it is more
Main pulse generation circuit when 3rd governor circuit of individual error calculation unit shares one.In fact, error calculation unit is also wrapped
Display circuit is included, the output end of the 3rd governor circuit and the input of display circuit connect, and display circuit is used for real-time display institute
In the verification result of calibrating unit.
As the further improvement of technical scheme, Three Phase Alternating-current Electrical Energy Meters verification system also includes display unit, main control
The output end of unit and/or the connection of the input of the output end of standard electric energy meter unit and display unit.With reference to figure 3 and Fig. 5, show
Show that unit includes the first display unit and the second display unit, the first display unit is PC, and PC can show verification result；
And the second display unit is connected with the output end of the single-chip microcomputer main control module of standard electric energy meter unit, the second display unit is touch
Display screen, the arrange parameter set available for the measurement data of display standard electric energy meter unit and input.
The present invention also provides a kind of Three Phase Alternating-current Electrical Energy Meters calibration method, is examined and determine applied to above-mentioned Three Phase Alternating-current Electrical Energy Meters
System, comprise the following steps：
S1, obtain predeterminated voltage parameter, the preset control parameters of standard electric energy meter unit, at least one tested electric energy meter
For verification parameters to establish the tested electric energy meter database of main control unit, tested electric energy meter database includes tested electric energy meter and phase
The corresponding relation for the verification parameters answered, predeterminated voltage parameter are used to control power subsystem to export default voltage signal；Default control
Parameter processed is used for the reference power supply signal for controlling power subsystem to produce input standard electric energy meter unit；Verification parameters are used to control electricity
Source unit produces the calibrating power supply signal of the tested electric energy meter of input.Specifically, before calibrating operation is carried out, in advance to main control
Unit input predeterminated voltage parameter, the preset control parameters of standard electric energy meter unit, the calibrating ginseng of at least one tested electric energy meter
Number, wherein, control power subsystem to produce default voltage signal when predeterminated voltage parameter is used for electric energy meter type identification and be delivered to
Tested electric energy meter；The preset control parameters of standard electric energy meter unit include calibrating voltage, calibrating electric current and calibrating phase；Tested electricity
The verification parameters of energy table are test electric current, and test electric current is several according to selected by each specifications parameter of tested electric energy meter
Electric current is tested, is tested the specifications parameter difference of electric energy meter, selected test electric current is also different, i.e., the calibrating electricity of tested electric energy meter
Source signal is test current signals；In tested electric energy meter database, the measurement electric current of electric energy meter and tested electric energy meter pair are tested
It should store.
S2, main control unit output voltage signal to tested electric energy meter according to predeterminated voltage state modulator power subsystem.
After S3, tested electric energy meter are applied in voltage signal, tested electric energy is judged using the identification of electric energy meter type identification unit
Type information is simultaneously returned to main control unit by the type of table, and with reference to figure 3, main control unit is PC, and main control unit passes through inspection
The type information of tested electric energy meter can be transmitted to the other parts of verification system by determining the communication network of system.
S4, main control unit produce according to tested electric energy meter with the corresponding relation control power subsystem of corresponding verification parameters
Power supply signal is examined and determine, different according to the verification parameters of tested electric energy meter, i.e., the test electric current of tested electric energy meter is different, power subsystem
Different test electric currents is produced to different tested electric energy meters；Tested electric energy meter produces tested electric energy arteries and veins according to calibrating power supply signal
Rush signal.
S5, main control unit control power subsystem to produce reference power supply signal, standard electric energy meter according to preset control parameters
Unit produces standard phase three-wire three electrical energy impulse signals and standard three-phase and four-line electrical energy impulse signals according to reference power supply signal.
S6, error calculation unit are according to type information selection standard phase three-wire three electrical energy impulse signals or standard three-phase and four-line
Electrical energy impulse signals are calculated according to standard electrical energy impulse signals and tested electrical energy impulse signals and missed as standard electrical energy impulse signals
Difference completes calibrating.
A kind of Three Phase Alternating-current Electrical Energy Meters calibration method obtains the type of tested electric energy meter by electric energy meter type identification unit
Afterwards, main control unit produces inspection according to the tested electric energy meter with the corresponding relation control power subsystem of corresponding verification parameters
Determine power supply signal；Tested electric energy meter produces tested electrical energy impulse signals according to calibrating power supply signal；Main control unit is according to default
Control parameter control power subsystem produces reference power supply signal, and standard electric energy meter unit produces standard three according to reference power supply signal
The line electrical energy impulse signals of phase three and standard three-phase and four-line electrical energy impulse signals；Finally, error calculation unit is according to tested electric energy meter
Type selecting corresponding standard electrical energy impulse signals error calculation is carried out to tested electrical energy impulse signals, complete three-phase electric energy meter
Calibrating；The present invention can be tested the type of electric energy meter with automatic decision and then complete verifying process flow, improve three-phase electric energy meter
Calibrating efficiency, realize that the calibrating of Three Phase Alternating-current Electrical Energy Meters is intelligent.
As the further improvement of technical scheme, electric energy meter type identification unit judges the method for being tested the type of electric energy meter
For：
Whether detect that electric current judges the type of tested electric energy meter according to identification circuit, when identification circuit detects electric current
When, judge tested electric energy meter as three-phase and four-line electric energy meter；Otherwise, judge tested electric energy meter as three-phase three-wire electric energy meter.Reference chart
6, if three-phase three-wire electric energy meter, according to its internal structure, Un terminals are sky, are to open between Ua, Ub, Uc signal wire and Un
Road, when power subsystem is to electric energy meter making alive, identification circuit can't detect electric current；If three-phase and four-line electric energy meter, Ua,
There is impedance in Ub, Uc signal wire and Un, when applying voltage, identification circuit can detect curent change, the voltage of identification circuit
Variable signal be electric energy meter identification signal, by electric energy meter identification signal report the first governor circuit carry out handle judgement can be real
The automatic identification of existing connection box of electric energy meter mode judges.
As the further improvement of technical scheme, standard electric energy meter unit produces standard three-phase three according to reference power supply signal
The method of line electrical energy impulse signals and standard three-phase and four-line electrical energy impulse signals is：
It is relative to obtain the three of input signal using the input signal of sampling circuit samples power subsystem with reference to figure 3 and Fig. 5
The phase voltage answered, phase current signal；Specifically, the three-phase current of standard electric energy meter unit is inputted by current sample module samples
The phase current signal of each phase of signal acquisition, and the three-phase and four-line for inputting standard electric energy meter unit is obtained by analog-to-digital conversion module
Voltage signal obtains the phase voltage signal of each phase；
Second governor circuit phase voltage, phase current signal control pulse-generating circuit according to corresponding to three-phase produce standard three
The line electrical energy impulse signals of phase four and standard phase three-wire three electrical energy impulse signals.
Specifically, the second governor circuit obtains standard three-phase and four-line electric energy arteries and veins according to the phase voltage and phase current signal of three-phase
The method for rushing signal and standard phase three-wire three electrical energy impulse signals is：
The A/B/C phase currents of three-phase and four-line electric energy meter produce electric energy with corresponding A/B/C phase voltages respectively；And phase three-wire three
Electric energy meter only has A/C phase currents to produce electric energy with corresponding AB/CB line voltages.Wherein three-phase three-wire electric energy meter and three-phase and four-line electricity
What the current segment of energy table was just as, only voltage segment is different.Therefore, the general power formula of three-phase and four-line electric energy meter is
Σ P4=Ua*Ia+Ub*Ib+Uc*Ic；
The general power formula of three-phase three-wire electric energy meter is
Σ P3=Uab*Ia+Ucb*Ic；
Wherein, line voltage Uab/Ucb can be calculated with equation below：
Uab=Ua-Ub
Ucb=Uc-Ub
After getting general power Σ P4 and Σ P3, because electric energy is the integration of power P in time, W=Pt, therefore can
To integrate out three-phase and four-line/phase three-wire three electric energy respectively, you can control pulse-generating circuit produces standard three-phase and four-line electric energy arteries and veins
Rush signal and standard phase three-wire three electrical energy impulse signals.
Error calculation unit is according to the type selecting standard phase three-wire three electrical energy impulse signals or standard three for being tested electric energy meter
The line electrical energy impulse signals of phase four as standard electrical energy impulse signals, error calculation unit according to when the tested electricity of main pulse signal measurement
The pulse width of energy impulse signal and standard electrical energy impulse signals, calculate pulse-length error；Judged according to pulse-length error
Whether tested electric energy meter normally obtains verification result, when pulse-length error is less than predetermined pulse width error, judges tested
Electric energy meter is qualified, otherwise, it is determined that tested electric energy meter is unqualified, completes Three Phase Alternating-current Electrical Energy Meters calibrating.The three-phase alternating current of the present invention
Electric energy meter calibration method also includes exporting verification result, specifically, directly displays the verification result of tested electric energy meter, is easy to examine
Determine staff and check verification result.
Above is the preferable implementation to the present invention is illustrated, but the invention is not limited to the implementation
Example, those skilled in the art can also make a variety of equivalent variations on the premise of without prejudice to spirit of the invention or replace
Change, these equivalent deformations or replacement are all contained in the application claim limited range.
Claims (11)
1. a kind of Three Phase Alternating-current Electrical Energy Meters verification system, it is characterised in that including main control unit, power subsystem, standard electric energy
Table unit and at least one calibrating unit, the calibrating unit include electric energy meter type identification unit, tested electric energy meter and error
Computing unit；The power subsystem is used to provide power supply, the standard electric energy meter for tested electric energy meter and standard electric energy meter unit
Unit is used to provide standard phase three-wire three electrical energy impulse signals and standard three-phase and four-line electrical energy impulse signals；The main control unit
It is connected respectively with power subsystem, electric energy meter type identification unit, standard electric energy meter unit, error calculation unit；The power supply list
Member is connected with electric energy meter type identification unit；The output end of the power subsystem respectively the input with standard electric energy meter unit,
The input connection of tested electric energy meter；The electric energy meter type identification unit is connected with tested electric energy meter；The tested electric energy meter
Output end, the input of the output end of standard electric energy meter unit and error calculation unit connects.
2. Three Phase Alternating-current Electrical Energy Meters verification system according to claim 1, it is characterised in that the electric energy meter type identification
Unit includes the first governor circuit and identification circuit, and first governor circuit is connected with power subsystem, main control unit, described
The output end of power subsystem is connected by identification circuit with the input of tested electric energy meter, the output end of the identification circuit and the
The input connection of one governor circuit.
3. Three Phase Alternating-current Electrical Energy Meters verification system according to claim 2, it is characterised in that the identification circuit includes electricity
Current transformer and first resistor, one end of the armature winding of the current transformer and the output end of power subsystem connect, described
The other end of the armature winding of current transformer is connected with tested electric energy meter, a termination of the secondary windings of the current transformer
Ground, the other end of the secondary windings of the current transformer and one end of first resistor connect, the other end of the first resistor
It is connected with the input of the first governor circuit.
4. Three Phase Alternating-current Electrical Energy Meters verification system according to claim 1, it is characterised in that the power subsystem includes electricity
Source circuit and multrirange current generating circuit, the power circuit are used to produce current and voltage signals；The main control unit with
Power circuit is connected, and the electric energy meter type identification unit is connected with power circuit, multrirange current generating circuit, the power supply
Circuit is connected with multrirange current generating circuit, the output end of the power circuit and input, the quilt of standard electric energy meter unit
The input connection of electric energy meter is surveyed, the output end of the multrirange current generating circuit is connected with the input of tested electric energy meter.
5. Three Phase Alternating-current Electrical Energy Meters verification system according to claim 4, it is characterised in that the multrirange electric current produces
Circuit includes multiple transforming circuits, and the transforming circuit includes transformer, the first controlling switch and the second controlling switch, the electricity
The output end of source circuit and the primary coil of transformer connect, one end of the first secondary coil of the transformer and the first control
Switch the first connection end connection, the second connection end of first controlling switch, the first secondary coil of transformer it is another
End is connected with the input of tested electric energy meter；One end of the second subprime coil of the transformer and the first of the second controlling switch
Connection end is connected, and the second connection end of second controlling switch is connected with the second connection end of the first controlling switch, the change
The other end of the second subprime coil of depressor is connected with the other end of the first secondary coil；The electric energy meter type identification unit with
The control terminal of first controlling switch, the connection of the control terminal of the second controlling switch.
6. Three Phase Alternating-current Electrical Energy Meters verification system according to claim 1, it is characterised in that the standard electric energy meter unit
Including the second governor circuit, sample circuit and pulse-generating circuit；The main control unit is connected with the second governor circuit；It is described
The output end of power subsystem and the input of sample circuit connect；The output end of the sample circuit is defeated with the second governor circuit
Enter end connection；The output end of second governor circuit and the input of pulse-generating circuit connect；The pulse-generating circuit
Output end and error calculation unit input connect.
7. Three Phase Alternating-current Electrical Energy Meters verification system according to claim 1, it is characterised in that the error calculation unit bag
Main pulse generation circuit and the 3rd governor circuit, the main control unit are connected with the 3rd governor circuit when including, main pulse when described
The output end of generation circuit, output end, the output end of standard electric energy meter unit of tested electric energy meter are defeated with the 3rd governor circuit
Enter end connection.
8. the Three Phase Alternating-current Electrical Energy Meters verification system according to any one of claim 1 to 7, it is characterised in that the three-phase
AC energy meter verification system also includes display unit, the output end of the main control unit and/or standard electric energy meter unit
The input of output end and display unit connects.
9. a kind of Three Phase Alternating-current Electrical Energy Meters calibration method, it is characterised in that applied to three described in any one of claim 1 to 8
Cross streams electric energy meter detecting system, comprises the following steps：
Obtain predeterminated voltage parameter, the preset control parameters of standard electric energy meter unit, the calibrating ginseng of at least one tested electric energy meter
Number to establish the tested electric energy meter database of main control unit, the tested electric energy meter database include tested electric energy meter with it is corresponding
Verification parameters corresponding relation, the predeterminated voltage parameter is used to control power subsystem to export default voltage signal；It is described
Preset control parameters are used for the reference power supply signal for controlling power subsystem to produce input standard electric energy meter unit；The verification parameters
For controlling power subsystem to produce the calibrating power supply signal of the tested electric energy meter of input；
The main control unit exports the voltage signal according to the predeterminated voltage state modulator power subsystem and is tested to described
Electric energy meter；
Electric energy meter type identification unit judges the type of the tested electric energy meter and the type information is returned into main control unit；
Corresponding relation control power subsystem production of the main control unit according to the tested electric energy meter with corresponding verification parameters
The raw calibrating power supply signal；The tested electric energy meter produces tested electrical energy impulse signals according to the calibrating power supply signal；
The main control unit controls power subsystem to produce the reference power supply signal, the mark according to the preset control parameters
Quasi- power meter unit produces standard phase three-wire three electrical energy impulse signals and standard three-phase and four-line electricity according to the reference power supply signal
Energy impulse signal；
The error calculation unit is according to the type information selection standard phase three-wire three electrical energy impulse signals or standard three-phase four
Line electrical energy impulse signals are as standard electrical energy impulse signals, according to the standard electrical energy impulse signals and tested electrical energy impulse signals
Calculation error completes calibrating.
10. Three Phase Alternating-current Electrical Energy Meters calibration method according to claim 9, it is characterised in that the electric energy meter type is known
The method of type that other unit judges are tested electric energy meter is：
Whether detect that electric current judges the type of tested electric energy meter according to identification circuit, when identification circuit detects electric current, sentence
The tested electric energy meter that breaks is three-phase and four-line electric energy meter；Otherwise, judge the tested electric energy meter for three-phase three-wire electric energy meter.
11. the Three Phase Alternating-current Electrical Energy Meters calibration method according to claim 9 or 10, it is characterised in that the standard electric energy
Table unit produces standard phase three-wire three electrical energy impulse signals and standard three-phase and four-line electrical energy pulse according to the reference power supply signal
The method of signal is：
The input signal of power subsystem described in sampling circuit samples is to obtain phase voltage, phase corresponding to the three-phase of the input signal
Current signal；
Second governor circuit phase voltage, phase current signal control pulse-generating circuit according to corresponding to the three-phase produce standard three
The line electrical energy impulse signals of phase four and standard phase three-wire three electrical energy impulse signals.
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| CN112444770A (en) * | 2019-08-30 | 2021-03-05 | 国网山东省电力公司东营市东营区供电公司 | Electric power metering device inspection box |
| CN113640730A (en) * | 2021-07-08 | 2021-11-12 | 深圳市科陆精密仪器有限公司 | Intelligent Internet of things meter electric energy error verification system and method |
| CN113671436A (en) * | 2021-09-09 | 2021-11-19 | 国网上海市电力公司 | Wireless detection method and system for intelligent electric energy meter |
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Application publication date: 20180316 |