CN103499807B - A kind of method of calibration eliminating digital electricity meter truncated error - Google Patents
A kind of method of calibration eliminating digital electricity meter truncated error Download PDFInfo
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- CN103499807B CN103499807B CN201310469615.4A CN201310469615A CN103499807B CN 103499807 B CN103499807 B CN 103499807B CN 201310469615 A CN201310469615 A CN 201310469615A CN 103499807 B CN103499807 B CN 103499807B
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Abstract
The present invention relates to a kind of calibration equipment eliminating digital electricity meter truncated error, include three-phase alternating-current supply, A/D/A changes calibration equipment, one tunnel of A/D/A conversion calibration equipment exports to tested digital electricity meter, another road exports input with electrical energy pulse error comparator respectively to conventional criteria electric energy meter, conventional criteria electric energy meter and tested digital electricity meter and is connected；The method that the invention still further relates to said apparatus, has including step: (1) produces three-phase alternating current/voltage；(2) analog quantity of sampling is converted into meets the data stream of communication protocol；(3) on the one hand data stream access in tested digital electricity meter, on the other hand enters after D/A changes in the standard electric energy meter of routine；(4) difference is sought in the pulse of above-mentioned two table outputs.The present invention effectively eliminates the truncated error produced owing to communication protocol limits, and makes error information more accurate.
Description
Technical field
The invention belongs to numeral Electric Energy Metering Technology field, a kind of calibration equipment eliminating digital electricity meter truncated error and method.
Background technology
nullHigh speed development along with intelligent grid，Digital transformer substation based on IEC61850 standard becomes the trend of transformer substation construction，Digitalized electric energy metering system will be increasingly becoming the main body of electric energy metrical，In digitalized electric energy metering system，The interface mode of digital electricity meter and operation principle，All there occurs the change of essence，Digital electricity meter received signal is the digitized electric current transmitted with fiber optic Ethernet、Voltage signal，There is not current transformer、The unit such as voltage transformer and A/D conversion，There is no error in theory，But in actual mechanical process，Owing to IEC61850-9-1 agreement limiting a length of 2 bytes of every phase current/information of voltage，This has resulted in the truncated error of sampled data，In the digital electricity meter error checking system of existing proposition，The most inevitably there is this error，But in the digital transformer substation of reality，The truncated error brought owing to IEC61850-9-1 agreement limits，The application condition into electronic mutual inductor should be calculated suitable，Because in numeral electric energy metered system，A/D conversion is to complete in electronic mutual inductor，The value of digital electricity meter directly by optical fiber when electronic mutual inductor sends，There is truncated error，And in actual electronic mutual inductor checkout procedure，The most strictly contain this fractional error.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art, it is provided that a kind of calibration equipment eliminating digital electricity meter truncated error and method.
The present invention solves it and technical problem is that and take techniques below scheme to realize:
A kind of calibration equipment eliminating digital electricity meter truncated error, this device includes three-phase alternating-current supply, the A/D/A accessing three-phase alternating-current supply changes calibration equipment, one tunnel of A/D/A conversion calibration equipment is converted into and meets the data stream of communication protocol IEC61850-9-1 and export to tested digital electricity meter, another road of A/D/A conversion calibration equipment with analog signals mode export to conventional criteria electric energy meter, conventional criteria electric energy meter and tested digital electricity meter all with the pulse way of output respectively input with electrical energy pulse error comparator be connected.
And, described A/D/A conversion calibration equipment farther includes signal sampling module, the A/D modular converter being connected is exported with signal sampling module, one tunnel output of A/D modular converter is connected with D/A modular converter, the output of D/A modular converter is connected with built-in three-phase alternating-current supply, built-in three-phase alternating-current supply be connected with outside conventional criteria electric energy meter again；Another road output of A/D modular converter is connected with digital communications module, digital communications module be connected with outside tested digital electricity meter.
A kind of method eliminating digital electricity meter truncated error calibration equipment, comprises the following steps that
(1) three-phase alternating current/voltage is exported by standard three-phase alternating-current supply；
(2) three-phase current/voltage enters A/D/A and changes calibration equipment, through signal sampling module, by the analog quantity of sampling according to the regulation of communication protocol IEC61850-9-1, by A/D converter, is converted into the data stream meeting communication protocol；
(3) meeting the data stream of communication protocol after converting, on the one hand by digital communications module, be directly accessed in tested digital electricity meter, digital electricity meter starts sampling accumulative electricity, exports corresponding electrical energy pulse；On the other hand data stream enters D/A modular converter, digital quantity after converting becomes analog signals once again, and the analog quantity after conversion is exported by built-in power, enters in conventional standard electric energy meter, conventional criteria electric energy meter starts sampling accumulative electricity, exports corresponding electrical energy pulse；
(4) pulse digital electricity meter and conventional criteria electric energy meter produced is by electrical energy pulse error comparator, draws the final error of verified digital electricity meter.
And, its every phase current of the communication protocol data stream in described step (2)/voltage retains the message length of 2 bytes.
Advantages of the present invention and good effect are
During the verification of digital electricity meter, the sampled data truncated error brought owing to IEC61850-9-1 agreement limits, by calibration equipment and the method for calibration of the present invention, ensure that and be defeated by digital electricity meter and standard electric energy meter electric current and the concordance of magnitude of voltage simultaneously, effectively eliminating the digital electricity meter truncated error produced owing to communication protocol limits, the error information making digital electricity meter is more accurate.
Accompanying drawing explanation
Fig. 1 is digital electric energy meter checking device figure of the present invention；
Fig. 2 is that in the present invention, A/D/A changes calibration equipment figure.
Detailed description of the invention
Being further described the embodiment of the present invention below in conjunction with accompanying drawing, following example are illustrative, are not determinate, it is impossible to limit protection scope of the present invention with this.
A kind of calibration equipment eliminating digital electricity meter truncated error, as shown in Figure 1, this device includes three-phase alternating-current supply, the A/D/A accessing three-phase alternating-current supply changes calibration equipment, one tunnel of A/D/A conversion calibration equipment is converted into and meets the data stream of communication protocol IEC61850-9-1 and export to tested digital electricity meter, another road of A/D/A conversion calibration equipment with analog signals mode export to conventional criteria electric energy meter, conventional criteria electric energy meter and tested digital electricity meter all with the pulse way of output respectively input with electrical energy pulse error comparator be connected.
In being embodied as of the present invention, as shown in Figure 2, described A/D/A changes calibration equipment: farther include signal sampling module, the A/D modular converter being connected is exported with signal sampling module, one tunnel output of A/D modular converter is connected with D/A modular converter, realizing from analog quantity to digital quantity again to the transformation process of analog quantity, the output of D/A modular converter is connected with built-in three-phase alternating-current supply, built-in three-phase alternating-current supply be connected with outside conventional criteria electric energy meter again；Another road output of A/D modular converter is connected with digital communications module, digital communications module be connected with outside tested digital electricity meter.
A kind of method eliminating digital electricity meter truncated error calibration equipment, comprises the following steps that
(1) three-phase alternating current/voltage is exported by standard three-phase alternating-current supply；
(2) three-phase current/voltage enters A/D/A and changes calibration equipment, through signal sampling module, by the analog quantity of sampling according to the regulation of communication protocol IEC61850-9-1, pass through A/D converter, it is converted into the data stream meeting communication protocol, now, due to the restriction of communication protocol, every phase current/voltage retains the message length of 2 bytes；
(3) meeting the data stream of communication protocol after converting, on the one hand by digital communications module, be directly accessed in tested digital electricity meter, digital electricity meter starts sampling accumulative electricity, exports corresponding electrical energy pulse；On the other hand data stream enters D/A modular converter, digital quantity after converting becomes analog signals once again, and the analog quantity after conversion is exported by built-in power, enters in conventional standard electric energy meter, conventional criteria electric energy meter starts sampling accumulative electricity, exports corresponding electrical energy pulse；
(4) pulse digital electricity meter and conventional criteria electric energy meter produced is by electrical energy pulse error comparator, draws the final error of verified digital electricity meter.
Claims (1)
1. eliminating a method of calibration for digital electricity meter truncated error, the device that the method is used includes three-phase alternating current
Source, the A/D/A accessing three-phase alternating-current supply changes calibration equipment, and a road of A/D/A conversion calibration equipment is converted into and meets communication
The data stream of stipulations IEC61850-9-1 exports to tested digital electricity meter, and another road of A/D/A conversion calibration equipment is with analog quantity
Aspect exports to conventional criteria electric energy meter, conventional criteria electric energy meter and tested digital electricity meter all with the pulse way of output respectively
Input with electrical energy pulse error comparator is connected,
It is characterized in that the method comprising the steps of as follows:
(1) three-phase alternating current/voltage is exported by standard three-phase alternating-current supply；
(2) three-phase current/voltage enters A/D/A and changes calibration equipment, through signal sampling module, the analog quantity of sampling is pressed
According to the regulation of communication protocol IEC61850-9-1, by A/D converter, it is converted into the data stream meeting communication protocol；
Wherein, its every phase current of communication protocol data stream/voltage retains the message length of 2 bytes；
(3) meet the data stream of communication protocol after converting, on the one hand by digital communications module, be directly accessed tested numeral electricity
In energy table, digital electricity meter starts sampling accumulative electricity, exports corresponding electrical energy pulse；On the other hand data stream enters D/A
Modular converter, the digital quantity after converting is become analog signals once again, and the analog quantity after conversion is carried out by built-in power
Output, enters in conventional standard electric energy meter, and conventional criteria electric energy meter starts sampling accumulative electricity, exports corresponding electric energy arteries and veins
Punching；
(4) pulse digital electricity meter and conventional criteria electric energy meter produced is by electrical energy pulse error comparator, draws by school
Test the final error of digital electricity meter.
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| CN201310469615.4A CN103499807B (en) | 2013-10-10 | 2013-10-10 | A kind of method of calibration eliminating digital electricity meter truncated error |
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| CN103499807B true CN103499807B (en) | 2016-08-17 |
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| CN106443563A (en) * | 2016-11-01 | 2017-02-22 | 国网江西省电力公司电力科学研究院 | Field environment based integrated calibrating and analytic device of digital electric energy meter |
| CN111398883B (en) * | 2020-02-28 | 2022-03-11 | 国网湖南省电力有限公司 | Electric energy meter truncation error online evaluation method, system and medium |
| CN112305487A (en) * | 2020-09-21 | 2021-02-02 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Laboratory error calibration system and method for digital direct current electric energy meter |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6501257B1 (en) * | 1995-11-30 | 2002-12-31 | General Electric Company | High speed multifunction testing and calibration of electronic electricity meters |
| CN102998651A (en) * | 2012-12-07 | 2013-03-27 | 陈江 | Error calibration device and system and error transfer system and method of full digital electric energy meter |
| CN103018707A (en) * | 2012-12-07 | 2013-04-03 | 山西省电力公司晋中供电分公司 | Error propagation method for digital electric energy meter |
| CN103048990A (en) * | 2012-12-07 | 2013-04-17 | 曹锐 | Error verification device and system and error propagation system and method of all-digital power measuring and controlling equipment |
| CN103336264A (en) * | 2013-06-07 | 2013-10-02 | 国家电网公司 | Digital electric energy meter quantity value tracing system based on analog quantity detection and digital electric energy meter quantity value tracing method based analog quantity detection |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US5631554A (en) * | 1993-03-26 | 1997-05-20 | Schlumberger Industries, Inc. | Electronic metering device including automatic service sensing |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6501257B1 (en) * | 1995-11-30 | 2002-12-31 | General Electric Company | High speed multifunction testing and calibration of electronic electricity meters |
| CN102998651A (en) * | 2012-12-07 | 2013-03-27 | 陈江 | Error calibration device and system and error transfer system and method of full digital electric energy meter |
| CN103018707A (en) * | 2012-12-07 | 2013-04-03 | 山西省电力公司晋中供电分公司 | Error propagation method for digital electric energy meter |
| CN103048990A (en) * | 2012-12-07 | 2013-04-17 | 曹锐 | Error verification device and system and error propagation system and method of all-digital power measuring and controlling equipment |
| CN103336264A (en) * | 2013-06-07 | 2013-10-02 | 国家电网公司 | Digital electric energy meter quantity value tracing system based on analog quantity detection and digital electric energy meter quantity value tracing method based analog quantity detection |
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