CN202583926U - Voltage and current output system of single phase alternating current power source for intelligent electric energy meter calibrating device for power grid - Google Patents
Voltage and current output system of single phase alternating current power source for intelligent electric energy meter calibrating device for power grid Download PDFInfo
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- CN202583926U CN202583926U CN 201220091168 CN201220091168U CN202583926U CN 202583926 U CN202583926 U CN 202583926U CN 201220091168 CN201220091168 CN 201220091168 CN 201220091168 U CN201220091168 U CN 201220091168U CN 202583926 U CN202583926 U CN 202583926U
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- power source
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- electric energy
- energy meter
- intelligent electric
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Abstract
The utility model discloses a voltage and current output system of a single phase alternating current power source for an intelligent electric energy meter calibrating device for a power grid. The system consists of a digital signal generator, a DA (Digital to Analogue) converter, a digital power amplifier, error feedback and an output isolation transformer. The system is connected with a PC (Personal Computer) through a standard RS485 interface. The digital signal generator realizes a direct digital synthesizer DDS (Direct Digital Synthesizer) by using a DSP (Digital Signal Processor) combined with an FPGA (Field Programmable Gate Array) and the DA converters to synthesize a sinusoidal signal. A current loop channel is automatically switched by using a relay.
Description
Technical field
The utility model relate to a kind of electrical network with the intelligent electric energy meter calibrating installation with single-phase AC power source voltage, electric current output system, the voltage of control single-phase AC power source, electric current output when relating to a kind of electrical network more specifically and examining and determine with intelligent electric energy meter.
Background technology
The AC power source is that electric energy meter to be identified provides " fictitious power ", makes electric energy meter be operated in the state of metering electric energy.The designing requirement in AC power source is at the complete sine wave signal of output, for the degree of distortion of sine wave certain restriction arranged.The single-phase AC power source is divided into voltage output and electric current output, respectively the voltage circuit end and the current return end of drive electricity table.The amplitude of the power signal of power source output, phase place, frequency, harmonic wave etc. all require scalable, to adapt to different requirement in the middle of the calibrating standard.
What system adopted is novel single-phase AC power source.Power source adopts the digital power amplifier technology.Voltage, electric current output area are wide, and output power is big, and degree of stability is high, degree of distortion is little.Output voltage, electric current, frequency, power factor, phase place etc. can arbitrarily be provided with.Have the hardware automatic fault and detect and defencive function, improve equipment dependability.The adjusting fineness of frequency can reach 0.001Hz, and the adjusting fineness of fundamental phase can reach 0.01.Adopt software to carry out self calibration, make the calibration of power source convenient, fast, stable, reliably.Can link to each other with PC through standard RS485 interface, control flexible.At present, intelligent electric energy meter has the double-loop metering function, and native system does not temporarily use the pattern of CT from cost consideration.Adopt relay automatic switchover current return passage.
The research thinking of power source adopts digital signal generator, DA converter, digital power amplifier, Error Feedback, the Design Pattern of output isolation transformer.Digital signal generator adopts the DSP+FPGA+DA converter to realize DDS (Direct Digital Synthesizer, Direct Digital compositor), synthetic sinusoidal signal.Full-bridge digital power amplifier (CLASS D) has heat radiation and lacks, and energy conversion is high, thereby has alleviated the weight of power source heating radiator.Partition method is adopted in transformer output sampling, has improved the isolation of output stability and complete machine.
Summary of the invention
A kind of electrical network, is characterized in that with single-phase AC power source voltage, electric current output system with the intelligent electric energy meter calibrating installation:
Electrical network is made up of digital signal generator, DA converter, digital power amplifier, Error Feedback, output isolation transformer with single-phase AC power source voltage, electric current output system with the intelligent electric energy meter calibrating installation; Link to each other with PC through standard RS485 interface; Digital signal generator adopts the DSP+FPGA+DA converter to realize Direct Digital compositor DDS; Synthetic sinusoidal signal adopts relay automatic switchover current return passage.
Description of drawings
Accompanying drawing 1 is the utility model voltage output block diagram;
Accompanying drawing 2 is the utility model electric current output block diagram;
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the utility model is done further to introduce, but not as the qualification to the utility model.
Electrical network is made up of digital signal generator, DA converter, digital power amplifier, Error Feedback, output isolation transformer with single-phase AC power source voltage, electric current output system with the intelligent electric energy meter calibrating installation; Link to each other with PC through standard RS485 interface; Adopt software to carry out self calibration; Digital signal generator adopts the DSP+FPGA+DA converter to realize Direct Digital compositor DDS, and synthetic sinusoidal signal adopts relay automatic switchover current return passage.
Claims (1)
1. an electrical network intelligent electric energy meter calibrating installation is characterized in that with single-phase AC power source voltage, electric current output system:
Electrical network is made up of digital signal generator, DA converter, digital power amplifier, Error Feedback, output isolation transformer with single-phase AC power source voltage, electric current output system with the intelligent electric energy meter calibrating installation; Link to each other with PC through standard RS485 interface; Digital signal generator adopts the DSP+FPGA+DA converter to realize Direct Digital compositor DDS; Synthetic sinusoidal signal adopts relay automatic switchover current return passage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220091168 CN202583926U (en) | 2012-03-12 | 2012-03-12 | Voltage and current output system of single phase alternating current power source for intelligent electric energy meter calibrating device for power grid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220091168 CN202583926U (en) | 2012-03-12 | 2012-03-12 | Voltage and current output system of single phase alternating current power source for intelligent electric energy meter calibrating device for power grid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202583926U true CN202583926U (en) | 2012-12-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220091168 Expired - Fee Related CN202583926U (en) | 2012-03-12 | 2012-03-12 | Voltage and current output system of single phase alternating current power source for intelligent electric energy meter calibrating device for power grid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202583926U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105203986A (en) * | 2015-09-16 | 2015-12-30 | 国家电网公司 | Digital power source tracing method and system |
| CN108322031A (en) * | 2018-02-02 | 2018-07-24 | 杭州佳和电气股份有限公司 | A kind of system and method in three-phase alternating current adjustable signal source |
| CN108802445A (en) * | 2017-03-13 | 2018-11-13 | 贵州电网有限责任公司电力科学研究院 | A kind of program controled power source and method of intelligent grid digitizer qualification |
-
2012
- 2012-03-12 CN CN 201220091168 patent/CN202583926U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105203986A (en) * | 2015-09-16 | 2015-12-30 | 国家电网公司 | Digital power source tracing method and system |
| CN108802445A (en) * | 2017-03-13 | 2018-11-13 | 贵州电网有限责任公司电力科学研究院 | A kind of program controled power source and method of intelligent grid digitizer qualification |
| CN108322031A (en) * | 2018-02-02 | 2018-07-24 | 杭州佳和电气股份有限公司 | A kind of system and method in three-phase alternating current adjustable signal source |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121205 Termination date: 20140312 |