CN208537708U - A kind of electric energy meter differential-mode current interference jamming immunity tester - Google Patents
A kind of electric energy meter differential-mode current interference jamming immunity tester Download PDFInfo
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- CN208537708U CN208537708U CN201821176106.7U CN201821176106U CN208537708U CN 208537708 U CN208537708 U CN 208537708U CN 201821176106 U CN201821176106 U CN 201821176106U CN 208537708 U CN208537708 U CN 208537708U
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- 230000036039 immunity Effects 0.000 title claims abstract description 13
- 238000001514 detection method Methods 0.000 claims abstract description 6
- 238000004804 winding Methods 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 238000012360 testing method Methods 0.000 abstract description 2
- 238000002474 experimental method Methods 0.000 description 6
- 238000005259 measurement Methods 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Abstract
A kind of electric energy meter differential-mode current interference jamming immunity tester, including the first signal generator, second signal generator, the first power amplifier, the second power amplifier, control unit, isolating transformer, current transformer, error detection unit, low pass impedance Z1 and high pass impedance Z 2.The utility model can apply simultaneously two amplitudes, phase controllable and contrary power frequency component and differential-mode current interference signal in the current circuit of checklist, for examining metering performance of the checklist under this interference, the test to electric energy meter differential-mode current interference immunity to interference is realized.
Description
Technical field
The utility model relates to a kind of electric energy meter differential-mode currents to interfere jamming immunity tester, belong to electric energy meter technical field.
Background technique
Can electric energy meter, which accurately and reliably measure, will directly affect the charge calculation problem between electricity consumption user and power supply company.
The differential-mode current of 2kHz-150kHz is interfered, and is mainly derived from such as power electronic equipment, inverter and power communication system and is set
It is standby.Interference signal meeting severe jamming is used for the power frequency current signal of electrical energy measurement, causes electrical energy meter electricity flow measurement route or electric current
The overload of mutual inductor.
To guarantee that it is accurate and reliable that electric energy meter is run at the scene, differential mode should be carried out according to IEC 61000-4-19 to electric energy meter
Current interference immunity experiment.Although having the equipment for meeting IEC relevant criterion, there is no the phases specifically for electric energy meter
Detection device is answered, metering performance of the electric energy meter under differential-mode current interference signal can not be examined.
Summary of the invention
The purpose of this utility model is, in order to overcome the deficiencies in the prior art, provides a kind of electric energy meter differential-mode current
Interfere jamming immunity tester, can will on the harassing and wrecking Signal averaging to the current circuit of checklist of 2kHz ~ 150kHz, realization pair
The differential-mode current immunity experiment of electric energy meter.
Technical solution of the utility model is as follows, a kind of electric energy meter differential-mode current interference jamming immunity tester, packet
It is mutual to include the first signal generator, second signal generator, the first power amplifier, the second power amplifier, control unit, isolating transformer, electric current
Sensor, error detection unit, low pass impedance Z1 and high pass impedance Z 2.
Described control unit output end is separately connected the input terminal of the first signal generator and second signal generator；First
The output end of signal generator is connected to the input terminal of the first power amplifier；The output end of first power amplifier respectively with isolating transformer one
Secondary side winding is connected with the first side winding of current transformer；Isolating transformer secondary side winding applies the secondary side voltage of conversion
It is added to the first port and third port of checklist；One end of Current Transformer Secondary side winding and the second port of checklist connect
It connects, the other end is connect with one end of low pass impedance Z1；The other end of low pass impedance Z1 is connect with the 4th port of checklist；Second letter
The output of number generator is connect with the input terminal of the second power amplifier；The output end of second power amplifier is connect with checklist second port, separately
One output end is connect through high pass impedance Z 2 with the 4th port of checklist；The pulse output of checklist and error detection unit connect
It connects.
Described control unit controls the first signal generator and exports power frequency component, control second signal generator output
The differential-mode current interference signal of 2kHz-150kHz.
Compared with prior art, the utility model has the beneficial effects that the utility model provides a kind of electric energy meter differential mode
Current interference jamming immunity tester controls two signal generators by control unit, applies in the current circuit of checklist
The power frequency component and differential-mode current interference signal for adding two amplitudes controllable and contrary；Utilize low pass impedance Z1 and high pass impedance
Z2 realizes the coupling and decoupling function of differential-mode current interference signal.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of this practical new equipment.
Specific embodiment
Present invention is further described in detail with specific embodiment with reference to the accompanying drawing:
It is the device of the invention structural schematic diagram shown in Fig. 1.
Jamming immunity tester, including the first signal generator, second are interfered in a kind of electric energy meter differential-mode current of the present embodiment
Signal generator, the first power amplifier, the second power amplifier, control unit, isolating transformer, current transformer, error detection unit, low pass
Impedance Z 1 and high pass impedance Z 2.
First signal generator generates power frequency component, mutual by isolating transformer and electric current respectively after the amplification of the first power amplifier
Sensor is linked into the corresponding ports of checklist, provides industrial frequency experiment voltage signal and industrial frequency experiment current signal for checklist；The
Binary signal generator exports the differential-mode current interference signal of 2kHz-150kHz, after the amplification of the second power amplifier, is connected to checklist
Second port 2 and the 4th port 4；Low pass impedance Z1 is low pass coupling network, and high pass impedance Z 2 is high pass couples network；Electric current is mutual
The secondary power current stimulus for surveying winding output of sensor is flowed by the second port 2 of checklist, from the 4th end of checklist
Mouth 4 flows out, another output end of the secondary side winding for flowing back to current transformer through low pass impedance Z1；High pass impedance Z 2 is high-pass filtering
Device, the DM EMI signal of the 2kHz-150kHz of second signal generator output, the second port 2 through checklist flows into, from quilt
The 4th port 4 outflow for examining table, another output end of the second power amplifier is flowed back to through impedance Z 2.
When test, the first signal generator output power frequency component is first controlled, measures checklist in industrial frequency experiment voltage signal
With relative error γ under industrial frequency experiment current signal1；Second signal generator is controlled again generates differential-mode current interference signal, measurement
The relative error γ of checklist at this time2,；Finally, passing through error in judgement knots modificationWhether meet the requirements to examine quilt
Examine performance of the table under this interference.
Claims (2)
1. jamming immunity tester is interfered in a kind of electric energy meter differential-mode current, which is characterized in that described device includes: the first signal hair
Raw device, second signal generator, the first power amplifier, the second power amplifier, control unit, isolating transformer, current transformer, error-detecting
Unit, low pass impedance Z1 and high pass impedance Z 2；
Described control unit output end is separately connected the input terminal of the first signal generator and second signal generator；First signal
The output end of generator is connected to the input terminal of the first power amplifier；The output end of first power amplifier respectively with the primary side of isolating transformer
Winding is connected with the first side winding of current transformer；The secondary side voltage of conversion is applied to by isolating transformer secondary side winding
The first port and third port of checklist；One end of Current Transformer Secondary side winding and the second port of checklist connect,
The other end is connect with one end of low pass impedance Z1；The other end of low pass impedance Z1 is connect with the 4th port of checklist；Second signal
The output of generator is connect with the input terminal of the second power amplifier；The output end of second power amplifier is connect with checklist second port, another
Output end is connect through high pass impedance Z 2 with the 4th port of checklist；The pulse output of checklist is connect with error detection unit.
2. jamming immunity tester is interfered in a kind of electric energy meter differential-mode current according to claim 1, which is characterized in that described
Control unit controls the first signal generator and exports power frequency component, the difference of control second signal generator output 2kHz-150kHz
Mould current interference signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821176106.7U CN208537708U (en) | 2018-07-24 | 2018-07-24 | A kind of electric energy meter differential-mode current interference jamming immunity tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821176106.7U CN208537708U (en) | 2018-07-24 | 2018-07-24 | A kind of electric energy meter differential-mode current interference jamming immunity tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208537708U true CN208537708U (en) | 2019-02-22 |
Family
ID=65385654
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821176106.7U Active CN208537708U (en) | 2018-07-24 | 2018-07-24 | A kind of electric energy meter differential-mode current interference jamming immunity tester |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208537708U (en) |
-
2018
- 2018-07-24 CN CN201821176106.7U patent/CN208537708U/en active Active
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