CN208026857U - A kind of electric energy meter load current change experimental rig - Google Patents
A kind of electric energy meter load current change experimental rig Download PDFInfo
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- CN208026857U CN208026857U CN201820376318.3U CN201820376318U CN208026857U CN 208026857 U CN208026857 U CN 208026857U CN 201820376318 U CN201820376318 U CN 201820376318U CN 208026857 U CN208026857 U CN 208026857U
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- standard scale
- electric energy
- energy meter
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Abstract
A kind of electric energy meter load current change experimental rig, including voltage waveform generator, isolating transformer, standard scale, error calculation unit, switch, current waveform generator, trigger element, control unit and display unit.The signal that trigger element is controlled using control unit, controls the conducting and cut-off of switch, applies the test waveform needed for experiment to checklist, and obtain the relative error of checklist by method of standard table；It can be used to examine electric energy meter metering performance when load current changes.
Description
Technical field
The utility model is related to a kind of electric energy meter load currents to change experimental rig, belong to electric energy meter technical field.
Background technology
As the important component of intelligent grid, the metering accuracy of intelligent electric energy meter directly affects the clearing of the electricity charge.
Existing national standard and company standard proposes technology to electric energy meter performance and requires and corresponding test method.For load electricity
The case where stream changes, only proposes requirement to the metering performance of electric energy meter under static state.However under practical operation situation,
The load current of electric energy meter may frequently be changed with high amplitude.Such as：Temperature regulating heater, air-conditioning equipment, electric arc welding are set
It is standby etc..Because mistakenly performing current range gain handoff algorithms, the error of certain instrument in the case has obviously been discontented with
Foot its class of accuracy requirement.The GB/T17215.211 of newest revision is proposed is turning on and off state using current circuit
Between repeat switching method, to realize the examination to electric energy meter metering performance when load current changes, and require open-minded
Switching between off state should be completed in a cycle of nominal frequency.Currently, also lacking corresponding experimental rig.
Invention content
The purpose of this utility model is, in order to solve the appraisal problem of electric energy meter metering performance when load current changes,
It is proposed that a kind of electric energy meter load current changes experimental rig.
The technical scheme for implementing the utility model is as follows, a kind of electric energy meter load current change experimental rig, including voltage
Waveform generator, isolating transformer, standard scale, error calculation unit, switch, current waveform generator, trigger element, control are single
Member and display unit.
Voltage waveform generator output end is connect with the primary side of isolation voltage device, the secondary side and standard of isolating transformer
The voltage circuit of table connects；The output end of current waveform generator is connect through switching with the current circuit of standard scale；Control unit
Output end and the input terminal of trigger element connect, the control terminal of the output end of trigger element and switch connects；The electricity of checklist
Flow Line is connected with the current circuit of standard scale；The voltage circuit of checklist is in parallel with the voltage circuit of standard scale；Checklist with
The pulse output end mouth of standard scale is connect with error calculation unit input terminal, and output end and the display unit of error calculation unit connect
It connects.
The switch uses controllable power electronic devices, can meet the switching between conducting state and cut-off state and
The requirement completed in a cycle of nominal frequency.
The operation principle of the utility model is that voltage waveform generator is surveyed through the voltage needed for isolating transformer output test
Try waveform；Current waveform generator is through switching the testing current waveform needed for output test；Control unit send out control signal to
Trigger element, trigger element answer the conducting and cut-off of trigger signal control switch according to experiment demand the output phase, to checklist and
The current circuit of standard scale applies the testing current waveform needed for experiment；Error calculation unit is sent out according to checklist and standard scale
Pulse calculate the relative error of checklist, and concrete numerical value is shown by display unit.
The utility model has the beneficial effects that the utility model provides a kind of electric energy meter load current change experiment dress
It sets, the signal of trigger element is controlled using control unit, controls the conducting and cut-off of switch, apply needed for experiment to checklist
Test waveform, and the relative error of checklist is obtained by method of standard table.The utility model can be used to that electric energy meter is examined to load
Metering performance when electric current changes.
Description of the drawings
Fig. 1 is the structure diagram of utility model device.
Specific implementation mode
The utility model is described in further detail with specific implementation mode below in conjunction with the accompanying drawings：
It is the principles of the present invention schematic diagram shown in Fig. 1, a kind of electric energy meter load current change experimental rig, including：
Voltage waveform generator, isolating transformer, standard scale, error calculation unit, switch, current waveform generator, trigger element, control
Unit and display unit processed
Voltage waveform generator output end and the primary survey of isolation voltage device connect, the secondary side and standard of isolating transformer
The voltage circuit of table connects；The output end of current waveform generator is connect through switching with the current circuit of standard scale；Control unit
Output end and the input terminal of trigger element connect, the control terminal of the output end of trigger element and switch connects；The electricity of checklist
Flow Line is connected with the current circuit of standard scale；The voltage circuit of checklist is in parallel with the voltage circuit of standard scale；Checklist with
The pulse output end mouth of standard scale is connect with error calculation unit input terminal, and output end and the display unit of error calculation unit connect
It connects.
According to the regulation of standard, if testing current waveform turn-on time ist on, deadline ist off, three kinds of examinations need to be completed
It tests：(1)t on=10s,t off=10s, overall test duration 4h；(2)t on=5s,t off=5s, overall test duration 4h；
(3)t on=5s,t off=0.5s, overall test duration 4h；By taking first experiment as an example, illustrate that the present invention realizes the specific of experiment
Step：By control waveform generator, the voltage tester waveform for testing required amplitude and phase is obtained；By transformation is isolated
Device, test waveform are applied to the voltage circuit of checklist and standard scale；：By controlling current waveform generator, experiment institute is obtained
Need the testing current waveform of amplitude and phase；Control unit meets experiment to the conducting of trigger element Signal-controlled switch with cut-off
It is required that so thatt on=10s,t off=10s, overall test duration 4h end 5s after 5s is connected, and cut-off is kept after lasting 4h
State；The pulse output end mouth of standard scale and checklist exports pulse to error calculation unit at this time, and computing unit calculates opposite
Error simultaneously shows concrete numerical value by display unit；Other experiment implementation methods can refer to above-mentioned specific steps.
It should be noted that controllable power electronic devices can be used in switch, can meet conducting state and cut-off state it
Between a cycle for switching in nominal frequency in complete requirement.
Claims (2)
1. a kind of electric energy meter load current changes experimental rig, which is characterized in that described device include voltage waveform generator, every
From transformer, standard scale, error calculation unit, switch, current waveform generator, trigger element, control unit and display unit；
The voltage waveform generator output end is connect with the primary side of the isolation voltage device, the secondary side of isolating transformer with
The voltage circuit of standard scale connects；The output end of the current waveform generator is connect through switching with the current circuit of standard scale；
The output end of described control unit and the input terminal of trigger element connect, and the output end of trigger element and the control terminal of switch connect
It connects；The current circuit of checklist is connected with the current circuit of the standard scale；The voltage circuit of checklist and the standard scale
Voltage circuit is in parallel；Checklist is connect with the pulse output end mouth of the standard scale with error calculation unit input terminal, the mistake
The output end of poor computing unit is connect with display unit.
2. a kind of electric energy meter load current according to claim 1 changes experimental rig, which is characterized in that the switch is adopted
With controllable power electronic devices, the switching between conducting state and cut-off state and a cycle in nominal frequency can be met
The requirement of interior completion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820376318.3U CN208026857U (en) | 2018-03-20 | 2018-03-20 | A kind of electric energy meter load current change experimental rig |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820376318.3U CN208026857U (en) | 2018-03-20 | 2018-03-20 | A kind of electric energy meter load current change experimental rig |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208026857U true CN208026857U (en) | 2018-10-30 |
Family
ID=63906998
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820376318.3U Expired - Fee Related CN208026857U (en) | 2018-03-20 | 2018-03-20 | A kind of electric energy meter load current change experimental rig |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208026857U (en) |
-
2018
- 2018-03-20 CN CN201820376318.3U patent/CN208026857U/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 |
Granted publication date: 20181030 Termination date: 20190320 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |