CN208224475U - A kind of electric energy meter DM EMI influence test device - Google Patents
A kind of electric energy meter DM EMI influence test device Download PDFInfo
- Publication number
- CN208224475U CN208224475U CN201820795905.6U CN201820795905U CN208224475U CN 208224475 U CN208224475 U CN 208224475U CN 201820795905 U CN201820795905 U CN 201820795905U CN 208224475 U CN208224475 U CN 208224475U
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- China
- Prior art keywords
- checklist
- standard
- inductance
- capacitor
- current circuit
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Abstract
A kind of electric energy meter DM EMI influence test device, comprising: display, error calculation unit, signal generator, operational amplifier, standard scale, normalized current source, standard voltage source, first capacitor (C1), the second capacitor (C2), the first inductance (L1) and the second inductance (L2).Apply the 2kHz-150kHz differential-mode current interference signal for meeting IEC standard in checklist current circuit, utility model device can detect relative error of the checklist under this interference signal automatically, for examining meter characteristic of the electric energy meter under this interference.
Description
Technical field
The utility model relates to a kind of electric energy meter DM EMIs to influence test device, belong to electrical energy measurement the field of test technology.
Background technique
The differential-mode current interference of 2kHz-150kHz is mainly derived from such as power electronic equipment, inverter and power communication
System equipment.Relative to power current, the differential-mode current interference signal in this frequency range can not ignore.Interference signal meeting
Severe jamming is used for the power frequency current signal of electrical energy measurement, causes the overload of electrical energy meter electricity flow measurement route or current transformer.
To guarantee that it is accurate and reliable that electric energy meter is run at the scene, the differential mode for meeting on-site actual situations should be applied to electric energy meter
Current interference signal；The specific method of test and requirement can be according to IEC 61000-4-19.Meet IEC relevant criterion although having
Equipment, but there is no specifically for electric energy meter corresponding detection device, can not examine electric energy meter differential-mode current interfere believe
Metering performance under number.
Summary of the invention
The purpose of this utility model is, in order to overcome the deficiencies in the prior art, solves examination electric energy meter in differential-mode current
Metering performance test problem under interference signal, the utility model disclose a kind of electric energy meter DM EMI influence test device.
Technical solution of the utility model is as follows: a kind of electric energy meter DM EMI influence test device, including display
Device, error calculation unit, signal generator, operational amplifier, standard scale, normalized current source, standard voltage source, first capacitor,
Second capacitor, the first inductance and the second inductance.
The output end of the standard voltage source and the voltage circuit of standard scale are in parallel；The output end of standard voltage source also with quilt
The voltage circuit for examining table is in parallel；The output end in normalized current source and one end of standard scale current circuit even join；Standard scale current line
The other end on road is connect through the first inductance with one end of checklist current circuit；The other end of checklist current circuit is through the second electricity
Sense is connect with normalized current source another output；Two ends of first capacitor respectively with the other end of standard scale current circuit, quilt
The other end for examining table current circuit is in parallel；The output of signal generator and the input terminal of operational amplifier connect；Operational amplifier
Reversed-phase output connect with one end of checklist current circuit, the positive output end of operational amplifier is through the second capacitor and tested
The other end of table current circuit connects；The pulse output end of checklist and standard scale connects with the input terminal of error calculation unit respectively
It connects；The output end of error calculation unit is connect with display, the corresponding relative error of display checklist.
The utility model has the beneficial effects that a kind of electric energy meter DM EMI provided by the utility model influences test dress
It sets, applies the 2kHz-150kHz differential-mode current interference signal for meeting IEC standard in checklist current circuit, can detect automatically
Relative error of the checklist under this interference signal ensure that accurate and reliable metering of the electric energy meter under this interference.
The utility model can detect checklist missing under 2kHz-150kHz differential-mode current interference signal relatively automatically
Difference, suitable for examining meter characteristic of the electric energy meter under this interference.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model.
Specific embodiment
Specific embodiment of the present utility model is as shown in Figure 1
It is the structural schematic diagram of the utility model shown in Fig. 1, a kind of electric energy meter DM EMI of the present embodiment influences test dress
It sets, comprising: display, error calculation unit, signal generator, operational amplifier, standard scale, normalized current source, normal voltage
Source, first capacitor C1, the second capacitor C2, the first inductance L1 and the second inductance L2.
The output end of standard voltage source and the voltage circuit of standard scale are in parallel；The output end of standard voltage source and checklist
Voltage circuit is also in parallel；Standard voltage source output setting amplitude standard sine voltage signal, while be applied to standard scale and by
Examine table；The output end in normalized current source and one end of standard scale current circuit even join；The other end of standard scale current circuit is through
One inductance L1 is connect with one end of checklist current circuit；The other end of checklist current circuit is through the second inductance L2 and standard electric
The connection of stream source another output.Two ends of first capacitor C1 respectively with the other end of standard scale current circuit and checklist electric current
The other end of route is in parallel.Normalized current source exports the standard sine current signal of setting amplitude to standard scale and the electricity of checklist
Flow Line.
The differential-mode current interference signal of signal generator output 2kHz-150kHz；The output of signal generator is put with operation
The input terminal connection of big device；The reversed-phase output of operational amplifier is connect with one end of checklist current circuit, operational amplifier
Positive output end connect through the second capacitor C2 with the other end of checklist current circuit；The pulse of checklist and standard scale exports
End is connect with the input terminal of error calculation unit respectively；The output end of error calculation unit is connect with display, shows checklist
Corresponding relative error.
The effect of second capacitor C2 is the current circuit that DM EMI signal is coupled to checklist；First inductance L1,
Two inductance L2 and first capacitor C1 constitute decoupling network, and DM EMI signal is prevented to be coupled to standard scale and normalized current source.
When test, signal generator stops output, the standard sine current signal of normalized current source output setting amplitude, mark
The standard sine voltage signal of reference voltage source output setting amplitude, error calculation unit pass through the checklist and standard scale received
The relative error a1 of checklist at this time is calculated in the pulse of output.
Signal generator is since 2kHz, according to the step-length of settingInterference signal is exported, in the current circuit of checklist
It is middle to form the differential-mode current interference signal contrary with standard sine current signal, end to 150kHz；Error calculation unit
The relative error a2 of checklist at this time is calculated in the pulse exported by the checklist and standard scale that receive, and further
Obtain relative error knots modification a3=a2-a1 of the checklist under the differential-mode current interference signal of this frequency；Checklist is found to exist
The maximum value of relative error knots modification within the scope of 2kHz-150kHz, and record corresponding frequency.
A kind of electric energy meter DM EMI provided in this embodiment influences test device, meets in the application of checklist current circuit
The 2kHz-150kHz differential-mode current interference signal of IEC standard can detect checklist missing under this interference signal relatively automatically
Difference, for examining meter characteristic of the electric energy meter under this interference.
Claims (2)
1. a kind of electric energy meter DM EMI influences test device, which is characterized in that described device includes display, error calculation list
Member, signal generator, operational amplifier, standard scale, normalized current source, standard voltage source, first capacitor, the second capacitor, first
Inductance and the second inductance；
The output end of the standard voltage source and the voltage circuit of standard scale are in parallel；The output end of standard voltage source also with checklist
Voltage circuit it is in parallel；The output end in normalized current source and one end of standard scale current circuit even join；Standard scale current circuit
The other end is connect through the first inductance with one end of checklist current circuit；The other end of checklist current circuit through the second inductance with
The connection of normalized current source another output；Two ends of first capacitor respectively with the other end of standard scale current circuit, checklist
The other end of current circuit is in parallel；The output of signal generator and the input terminal of operational amplifier connect；Operational amplifier it is anti-
Phase output terminal is connect with one end of checklist current circuit, and the positive output end of operational amplifier is through the second capacitor and checklist electricity
The other end of Flow Line connects；The pulse output end of checklist and standard scale is connect with the input terminal of error calculation unit respectively；
The output end of error calculation unit is connect with display, the corresponding relative error of display checklist.
2. a kind of electric energy meter DM EMI according to claim 1 influences test device, which is characterized in that first electricity
Sense, the second inductance and first capacitor constitute decoupling network, and DM EMI signal is prevented to be coupled to standard scale and normalized current source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820795905.6U CN208224475U (en) | 2018-05-25 | 2018-05-25 | A kind of electric energy meter DM EMI influence test device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820795905.6U CN208224475U (en) | 2018-05-25 | 2018-05-25 | A kind of electric energy meter DM EMI influence test device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208224475U true CN208224475U (en) | 2018-12-11 |
Family
ID=64506778
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820795905.6U Expired - Fee Related CN208224475U (en) | 2018-05-25 | 2018-05-25 | A kind of electric energy meter DM EMI influence test device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208224475U (en) |
-
2018
- 2018-05-25 CN CN201820795905.6U patent/CN208224475U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20181211 |