CN207232380U - Communication module of intelligent electric energy meter interface load capacity test device - Google Patents
Communication module of intelligent electric energy meter interface load capacity test device Download PDFInfo
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- CN207232380U CN207232380U CN201720895751.3U CN201720895751U CN207232380U CN 207232380 U CN207232380 U CN 207232380U CN 201720895751 U CN201720895751 U CN 201720895751U CN 207232380 U CN207232380 U CN 207232380U
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Abstract
The utility model discloses a kind of communication module of intelligent electric energy meter interface load capacity test device, by resistance R1, resistance R2, resistance R3, triode Q1, triode Q2, relay J1, A/D converter, temperature sensor, DSP, D/A converter, control unit and display composition.The utility model can control triode Q according to the type of tested electric energy meter by control unit1Base stage and emitter between voltage, make to flow through triode Q1Electric current and setting value approximately equal；Device, which can also monitor, flows through triode Q1Actual current value id, according to obtained communication module interface VccMagnitude of voltage V between end and GND0, whether the load capacity that automatic decision is tested electric energy meter communication module interface meet the requirements.
Description
Technical field
The utility model category Electric Energy Metering Technology field, in particular to a kind of communication module of intelligent electric energy meter interface
Load capacity test device.
Background technology
Important component of the intelligent electric energy meter as intelligent grid, is more and more widely used.National grid
Company has formulated a series of company standard, and requirement is proposed to the performance of electric energy meter.The communication of communication module and electric energy meter connects
Mouth connection is to realize carrier communication, to verify communication interface load capacity, standard regulation：The communication module interface of single-phase electric energy meter
Access 96 Ω resistance, VCCPort voltage value should be ± 12V ± 1V, and current range is 0mA~125mA；The communication of three-phase electric energy meter
Module interface accesses 30 Ω resistance, VCCPort voltage value should be ± 12V ± 1V, and current range is 0mA~400mA.
It is 96 Ω (single-phase electric energies that traditional detection method need to manually access resistance value in tested electric energy meter communication module interface
Table) or 30 Ω (three-phase electric energy meter) purely resistive resistance, its required precision be ± 5%.During test, according to the type of electric energy meter,
The resistance of respective resistance values is replaced, judges that the band for being tested table communication module interface carries energy by measuring corresponding voltage and current value
Whether power meets standard requirement.The method needs artificial wiring and replaces resistance, can be tight when detected electric energy meter quantity is larger
Ghost image rings detection efficiency；The resistance value that can also result in resistance in test the problem of resistance heating shifts, and influences test knot
The accuracy of fruit.
Utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, there is provided a kind of communication module of intelligent electric energy meter
Interface load capacity test device, according to the type of tested electric energy meter, adjust automatically obtains V to adapt to detection demandccEnd electricity
Pressure, realizes the automatic test of electric energy meter communication module interface load capacity.
In order to solve the above-mentioned technical problem, the utility model is realized using following technical scheme：
A kind of communication module of intelligent electric energy meter interface load capacity test device, including：Resistance R1, resistance R2, resistance R3、
Triode Q1, triode Q2, relay J1, A/D converter, temperature sensor, DSP, D/A converter, control unit and display
Device；
Resistance R1With resistance R2Series connection, then the both ends V with electric energy meter communication module interface respectivelyCCEnd is connected with GND；Three
Pole pipe Q1Collector and communication module interface VCCEnd connection, triode Q1Emitter through resistance R1With relay J1Ground connection；Electricity
Hinder R2An input of the voltage at both ends as A/D converter, resistance R3The voltage at both ends as A/D converter another is defeated
Enter；The output terminal of A/D converter is connected with DSP input terminals, and the output terminal of DSP is connected with D/A converter and accesses control unit
An input terminal, resistance R3Another input of the voltage signal at both ends as control unit；Temperature sensor exports and DSP
Connection, DSP output terminals and triode Q2Ground level is connected, triode Q2Collector and relay J1Coil be connected, triode Q2Hair
Emitter grounding；Display is connected with DSP, to show actual current value idAnd communication module interface VCCThe magnitude of voltage V at end0。
Described control unit, including：Resistance R4, resistance R5, resistance R6, resistance R7, resistance R8, resistance R9, resistance R10, amplification
Device A1With amplifier A2；
Resistance R4One end and the output of D/A converter connect, the other end and amplifier A1End of oppisite phase connection；Resistance R7
Both ends respectively with amplifier A1End of oppisite phase connected with output terminal；Amplifier A1In-phase end through resistance R6Ground connection, resistance R3 two
The voltage signal at end is through resistance R5With amplifier A2In-phase end connection；Amplifier A1Output terminal is through resistance R8With amplifier A2It is anti-phase
End connection；Amplifier A2End of oppisite phase ground connection；Resistance R9With capacitance C1Series connection, both ends respectively with amplifier A2End of oppisite phase and defeated
Outlet connects；Amplifier A2Output terminal through resistance R10With triode Q1Base stage connection.
The use principle of the utility model is：DSP determines setting value according to the type of tested electric energy meter, by DSP outputs simultaneously
Analog signal is converted into through D/A converter, an input signal as control unit；Resistance R3The voltage at both ends reflects stream
Cross triode Q1Electric current, another input signal as control unit；Control unit compares this two output signals
Compared with according to comparative result, passing through control unit and control triode Q1Base stage and emitter between voltage, make to flow through triode
Q1Electric current it is equal with setting value；Take resistance R3The control source at both ends flows through triode Q to A/D converter by what is obtained1's
Electric current is converted into digital signal, is handled by DSP and shows specific current value value i by displayd；Resistance R1With resistance R2Series connection, two
Hold the V with communication module interface in electric energy meter respectivelyCCEnd is connected with GND ends, takes resistance R2The control source at both ends is changed to A/D
Device, the triode Q that will be obtained1The voltage conversion at collector and emitter both ends is handled and by showing into digital signal by DSP
Device shows specific magnitude of voltage V0, can determine whether electric energy meter communication module interface load capacity meets the requirements according to this value；Work as prison
What is measured flows through triode Q1Current value idMore than triode Q1The temperature that maximum allowed current or temperature sensor detect surpasses
When crossing predetermined value, DSP sends control signal, passes through triode Q2Control relay J1Coil, make relay J1Disconnect, rose
Protective effect.
The utility model uses the proportional plus integral control method of close loop negative feedback, realizes zero steady state error control.Control unit bag
Include subtraction circuit and proportional integral circuit.Resistance R4, resistance R5, resistance R6, resistance R7With amplifier A2Form differential type subtraction electricity
Road, amplifier A2Export V1With given value of current valueWith actual value idThere is following relation：
As resistor satisfied R4=R5=R6=R7When, above formula can be reduced to：
Resistance R8, resistance R9, capacitance C1With amplifier A1Composition integrating circuit, proportional integral circuit is by proportional component
It is formed by stacking with integral element two parts；Output voltage V of the proportional component to subtraction circuit1It is amplified, amplification coefficient Kp,
Selection K can be set according to system optimalpValue；Output voltage V of the integral element to subtraction circuit1Integration；If voltage V1Value not
Be approximately zero, then capacitance C1Constantly charging, to output voltage V1Integration, until amplifier A2Output voltage V2Reach limit value, so that
Realize the zero steady state error control of electric current.
Amplifier A1Export V2With input voltage V1Relation is as follows：
The beneficial effects of the utility model are：The utility model provides a kind of communication module of intelligent electric energy meter interface band and carries energy
Force test device, according to the type of tested electric energy meter, triode Q is controlled by control unit1Base stage and emitter between
Voltage, makes to flow through triode Q1Electric current and setting value approximately equal；Device, which can also monitor, flows through triode Q1Actual current
Value id, according to obtained communication module interface VccMagnitude of voltage V between end and GND0, automatic decision is tested electric energy meter communication module
Whether the load capacity of interface meets the requirements.
Brief description of the drawings
Fig. 1 is the principle of device schematic diagram of the utility model；
Fig. 2 is the flow chart that the realization of the utility model detects automatically.
Embodiment
The utility model is described in further detail with embodiment below in conjunction with the accompanying drawings：
It is the principle of device schematic diagram of the utility model shown in Fig. 1, a kind of communication module of intelligent electric energy meter interface band carries energy
Force test device, including：Resistance R1, resistance R2, resistance R3, triode Q1, triode Q2, relay J1, A/D converter, temperature
Sensor, DSP, D/A converter, control unit and display composition.Resistance R1With resistance R2Series connection, then both ends respectively with electricity
The V of energy table communication module interfaceCCEnd is connected with GND；Triode Q1Collector and communication module interface VCCEnd connection, triode
Q1Emitter through resistance R1With relay J1Ground connection；Resistance R2An input of the voltage at both ends as A/D converter, resistance R3
Another input of the voltage at both ends as A/D converter；The output terminal of A/D converter is connected with DSP input terminals, and DSP's is defeated
Outlet is connected with D/A converter and accesses an input terminal of control unit, resistance R3The voltage signal at both ends is single as control
Another input of member；Temperature sensor output is connected with DSP, DSP output terminals and triode Q2Ground level is connected, triode Q2Collection
Electrode and relay J1Coil be connected, triode Q2Emitter is grounded；Display is connected with DSP, to show actual current value id
And communication module interface VCCThe magnitude of voltage V at end0。
During test, AC power output is identical with being tested the reference voltage of electric energy meter, and power supply is provided for ammeter.When tested table
For single-phase electric energy meter when, DSP determines that current setting value is 125mA；When tested table is three-phase electric energy meter, DSP determines that electric current is set
Definite value is 400mA；Exported by DSP and be converted into analog signal through D/A converter, an input signal as control unit；
Resistance R3The voltage at both ends, which reflects, flows through triode Q1Electric current, another input signal as control unit；Control unit
Proportional plus integral control is carried out after subtracting each other to the two output signals, triode Q is controlled by control unit1Base stage and hair
Voltage between emitter-base bandgap grading, makes to flow through triode Q1Electric current it is equal with setting value, realize the zero steady state error control of electric current；Take resistance R3
The control source at both ends flows through triode Q to A/D converter by what is obtained1Electric current be converted into digital signal, by DSP processing
And concrete numerical value i is shown by displayd；Resistance R1With resistance R2Series connection, the both ends V with communication interface in electric energy meter respectivelyccEnd and
GND ends connect, and take resistance R2The control source at both ends is to A/D converter, the triode Q1 collector and emitters two that will be obtained
Terminal voltage is converted into digital signal, is handled by DSP and shows concrete numerical value V by display0；Work as V0In the range of ± 12V ± 1V
When, then it is tested the requirement that table meets standard；Work as V0When not in the range of ± 12V ± 1V, then the requirement that table is unsatisfactory for standard is tested；
When what is monitored flows through triode Q1Current value idMore than its maximum allowed current or temperature sensor monitors to temperature exceed
During preset value (such as 70 DEG C), DSP sends control signal, passes through triode Q2Control relay J1Coil, make relay J1It is disconnected
Open, play the role of overcurrent and overheat protector.
Control unit includes：Resistance R4, resistance R5, resistance R6, resistance R7, resistance R8, resistance R9, resistance R10, amplifier A1
With amplifier A2；Resistance R4One end and the output of D/A converter connect, the other end and amplifier A1End of oppisite phase connection；Resistance
R7Both ends respectively with amplifier A1End of oppisite phase connected with output terminal；Amplifier A1In-phase end through resistance R6Ground connection, resistance R3
The voltage signal at both ends is through resistance R5With amplifier A2In-phase end connection；Amplifier A1Output terminal is through resistance R8With amplifier A2Instead
Phase end connects；Amplifier A2End of oppisite phase ground connection；Resistance R9With capacitance C1Series connection, both ends respectively with amplifier A2End of oppisite phase and
Output terminal connects；Amplifier A2Output terminal through resistance R10With triode Q1Base stage connection.
Resistance R4, resistance R5, resistance R6, resistance R7With amplifier A2Differential type subtraction circuit is formed, realizes given value of current valueWith actual value idSubtract each other, resistance R8, resistance R9, capacitance C1With amplifier A2Composition integrating circuit, realization pairAnd idDifference
It is worth zero steady state error control.
Fig. 2 is the flow chart that the realization of the utility model detects automatically, detects intelligent electric energy meter communication interface load capacity
The step of it is as follows：
Step 1：Power supply is opened, test starts；
Step 2：According to tested electric energy meter type, setting electric current value initial value
Step 3：Detection resistance R3Voltage, obtains flowing through triode Q1Electric current；
Step 4：Temperature sensor detects power device temperature；
Step 5：Detection temperature exceedes preset temperature, system alarm, and test is interrupted；Detection temperature is less than preset value, enters
Step 7；
Step 6：Detection electric current exceedes triode Q1Maximum allowed current, system alarm, test are interrupted；Detection electric current is less than
Triode Q1Maximum allowed current, enters step 7；
Step 7：DSP compares current setting valueWith current actual value id；
Step 8：Current setting valueWith current actual value idWhen unequal, 9 are entered step；Current setting valueWith electric current
Actual value idWhen equal, 11 are entered step；
Step 9：Triode Q is adjusted by proportional plus integral control1Voltage between base terminal and emitter,
Step 10：Return to step 3, until actual current idWith setting valueApproximately equal；
Step 11：Detect electric energy meter communication module interface VCCVoltage V between end and GND0.
Step 12：DSP judges V0Whether in the range of ± 12 ± 1V, test result is provided：As equal, then tested electricity is judged
Energy table is met the requirements；If not in the range of, then judged, tested electric energy meter is unsatisfactory for requiring；
Step 13：Test terminates.
Compared with prior art, the beneficial effects of the utility model are：The utility model provides a kind of intelligent electric energy meter and leads to
Believe module interface load capacity test device, according to the type of tested electric energy meter, triode Q is controlled by control unit1Base
Voltage between pole and emitter, makes to flow through triode Q1Electric current and setting value approximately equal；Device, which can also monitor, to be flowed through
Triode Q1Current value idWith the temperature of power device, there is protective effect；By obtained VCCMagnitude of voltage between end and GND
V0, whether the load capacity that automatic decision is tested electric energy meter communication module interface meet the requirements.
Undeclared part involved in the utility model is same as the prior art or is realized using the prior art.
Claims (2)
1. a kind of communication module of intelligent electric energy meter interface load capacity test device, including：Resistance R1, resistance R2, resistance R3, three
Pole pipe Q1, triode Q2, relay J1, A/D converter, temperature sensor, DSP, D/A converter, control unit and display；
It is characterized in that：Resistance R1With resistance R2Series connection, the both ends V with electric energy meter communication module interface respectivelyCCEnd is connected with GND；Three poles
Pipe Q1Collector and communication module interface VCCEnd connection, triode Q1Emitter through resistance R1With relay J1Ground connection；Resistance
R2An input of the voltage at both ends as A/D converter, resistance R3Another input of the voltage at both ends as A/D converter；
The output terminal of A/D converter is connected with DSP input terminals, and the output terminal of DSP is connected with D/A converter and accesses the one of control unit
A input terminal, resistance R3Another input of the voltage signal at both ends as control unit；Temperature sensor is exported to be connected with DSP
Connect, DSP output terminals and triode Q2Ground level is connected, triode Q2Collector and relay J1Coil be connected, triode Q2Transmitting
Pole is grounded；Display is connected with DSP, to show actual current value idAnd communication module interface VCCThe magnitude of voltage V at end0。
2. communication module of intelligent electric energy meter interface load capacity test device as claimed in claim 1, it is characterized in that：The control
Unit processed includes：Resistance R4, resistance R5, resistance R6, resistance R7, resistance R8, resistance R9, resistance R10, amplifier A1With amplifier A2；
Resistance R4One end and the output of D/A converter connect, the other end and amplifier A1End of oppisite phase connection；Resistance R7Both ends point
Not with amplifier A1End of oppisite phase connected with output terminal；Amplifier A1In-phase end through resistance R6Ground connection, resistance R3The voltage at both ends
Signal is through resistance R5With amplifier A2In-phase end connection；Amplifier A1Output terminal is through resistance R8With amplifier A2End of oppisite phase connects；
Amplifier A2End of oppisite phase ground connection；Resistance R9With capacitance C1Series connection, both ends respectively with amplifier A2End of oppisite phase and output terminal connect
Connect；Amplifier A2Output terminal through resistance R10With triode Q1Base stage connection.
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| CN201720895751.3U CN207232380U (en) | 2017-07-21 | 2017-07-21 | Communication module of intelligent electric energy meter interface load capacity test device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107450043A (en) * | 2017-07-21 | 2017-12-08 | 国网江西省电力公司电力科学研究院 | Communication module of intelligent electric energy meter interface load capacity test device and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107450043A (en) * | 2017-07-21 | 2017-12-08 | 国网江西省电力公司电力科学研究院 | Communication module of intelligent electric energy meter interface load capacity test device and method |
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