CN107612642A - A kind of signal band and out-of-band interference level method of testing - Google Patents
A kind of signal band and out-of-band interference level method of testing Download PDFInfo
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- CN107612642A CN107612642A CN201710986815.5A CN201710986815A CN107612642A CN 107612642 A CN107612642 A CN 107612642A CN 201710986815 A CN201710986815 A CN 201710986815A CN 107612642 A CN107612642 A CN 107612642A
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Abstract
The present invention relates to a kind of signal band and out-of-band interference level method of testing, including：Terminal starts carrier communication test event, and carrier communication order is sent to tested concentrator or Copy and reading apparatus by communication interface；The data of tested carrier wave meter are received, judge carrier communication success or not；Test system is notified by communication interface simultaneously, industrial computer starts the testing process control program of the project；After frequency spectrograph inside test system completes test carrier wave transmission level parameter, industrial computer sends stopping test command；The working condition of test system is adjusted according to carrier communication result, the test data of industrial computer storage is read from communication interface and completes to handle.The present invention gives method according to DL/T 698 and carried out, sampled signal is by circuits such as isolation level conversion, sampling for transmitting terminal and receiving terminal send frequency spectrograph to measure again, obtains actual carrier level, realizes the advantages of measuring stability high anti-jamming capacity is strong.
Description
Technical field
The present invention relates to signal band, spiking output level and out-of-band interference level technical field of measurement and test, especially
It is a kind of signal band and out-of-band interference level method of testing.
Background technology
With the raising of Automation of Electric Systems degree, and computer technology is increasingly extensive in power system should
With.For traditional electric energy tariff mode due to drawbacks such as its efficiency is low, the big, poor reliability of input, can not adapt to new situation will
Ask.A set of electric flux automatic metering system tool high-precision, reliable and stable, that automaticity is high is established to have significant practical applications.
Metering automation terminal device by local communication network communicated with electric energy meter between communicated, in power information
In the framework of acquisition system, mainly by low voltage power line carrier, RS-485 and micropower be wireless etc., group communicates local communication network
Mode forms.Compared to other communication modes, this scheme convenient, that cost is cheap of construction of low voltage power line carrier enjoys electric power
Company favors.But the development of construction and the pilot work with automatic meter reading system, relevant issues gradually show.Power carrier leads to
Used by letter there is certain birth defect in communication channel, because the original design of low-voltage power line is to ensure distribution wire
The power Transmission on road, it is not dedicated for transmitting the communications carrier of high-frequency signal, so there is make an uproar on low-voltage power line
Acoustic jamming is big, attenuation change is fast, line impedance constantly changes with the access of change and the load of topological structure, while circuit
The uncertain factor such as length and connecting node also impacts to low-voltage powerline carrier communication speed and reliability, is badly in need of research and development
A kind of signal band and out-of-band interference level method of testing.
The content of the invention
There is comparativity it is an object of the invention to provide a kind of result for ensureing level detecting, realize measuring stability
The strong signal band of high anti-jamming capacity and out-of-band interference level method of testing.
To achieve the above object, present invention employs following technical scheme：A kind of signal band and out-of-band interference electricity
Flat method of testing, the step of this method includes following order：
(1) terminal starts carrier communication test event, i.e. spiking output level and out-of-band interference level is surveyed
Program is tried, carrier communication order is sent to tested concentrator or Copy and reading apparatus by communication interface；
(2) data of tested carrier wave meter are received, judge carrier communication success or not；
(3) test system while by communication interface is notified, industrial computer starts the testing process control program of the project；
(4) after the frequency spectrograph inside test system completes test carrier wave transmission level parameter, industrial computer sends stopping and surveyed
Examination order；
(5) working condition of test system is adjusted according to carrier communication result, industrial computer storage is read from communication interface
Test data simultaneously is completed to handle.
When terminal starts carrier communication test event, power conditioner system, power conditioner are added in test system
System provides communication interface ideal low-voltage power line simulation test environment.
The data of tested carrier wave meter are received by single-phase carrier electric energy meter or Three Phase Carrier Based electric energy meter, judge carrier communication into
Whether is work(.
When industrial computer starts the project testing Row control program, test process is monitored using digital oscilloscope,
In the actual sequential of time domain reflection carrier communication.
In step (5), when carrying out data processing, signal band test is carried out according to the standards of DL/T 698, first uses frequency spectrum
Instrument tests maximum signal level, then carries out height analysis to current spectral, obtains 20dB smaller than peak signal off-center frequency
A pair of frequencies of rate, this is subtracted each other to the frequency of frequency, takes absolute value, obtains current carrier signal band.
As shown from the above technical solution, the advantage of the invention is that：First, the present invention gives method according to DL/T 698 and entered
OK, the key of the project is the measurement of signal level, it is ensured that the result of level detecting has comparativity；Second, it is necessary to have
Appropriate test environment, artificial mains network can undertake this role, be reached using the stable impedance operator of artificial mains network
To the target of test uniformity, mentalities of designing of the GB/T6113.103-2008 on artificial mains network is borrowed, carries out carrier wave letter
Number sampling；3rd, sampled signal send grammed switch, as test port, computer choosing by circuits such as isolation level conversion
Lead to the sampling that different test ports represents unlike signal, the sampling for transmitting terminal and receiving terminal send frequency spectrograph to be surveyed again
Amount, obtains actual carrier level, realizes the advantages of measuring stability high anti-jamming capacity is strong.
Brief description of the drawings
Fig. 1 is flow chart of the method for the present invention.
Embodiment
As shown in figure 1, a kind of signal band and out-of-band interference level method of testing, this method includes following order
Step：
(1) terminal starts carrier communication test event, i.e. spiking output level and out-of-band interference level is surveyed
Program is tried, carrier communication order is sent to tested concentrator or Copy and reading apparatus by communication interface；
(2) data of tested carrier wave meter are received, staff judges carrier communication success or not by the data of carrier wave meter；
(3) while by communication interface test system industrial computer is notified to start the testing process control program of the project；Survey
Test system is made up of spectrum analyzer and digital oscilloscope；
(4) after the frequency spectrograph inside test system completes test carrier wave transmission level parameter, industrial computer sends stopping and surveyed
Examination order；
(5) working condition of test system is adjusted according to carrier communication result, industrial computer storage is read from communication interface
Test data simultaneously is completed to handle.
When terminal starts carrier communication test event, power conditioner system, power conditioner are added in test system
System provides communication interface ideal low-voltage power line simulation test environment.
The data of tested carrier wave meter are received by single-phase carrier electric energy meter or Three Phase Carrier Based electric energy meter, judge carrier communication into
Whether is work(.
When industrial computer starts the project testing Row control program, test process is monitored using digital oscilloscope,
In the actual sequential of time domain reflection carrier communication.
In step (5), when carrying out data processing, signal band test is carried out according to the standards of DL/T 698, first uses frequency spectrum
Instrument tests maximum signal level, then carries out height analysis to current spectral, obtains 20dB smaller than peak signal off-center frequency
A pair of frequencies of rate, this is subtracted each other to the frequency of frequency, takes absolute value, obtains current carrier signal band.
The present invention is using signal level test thinking, equally to being tested with outer level, although 698 define signal
The test method of frequency band, still, can not be by the use of the respective point of signal band as criterion, because maximum letter outside the band with outer level
The amplitude of number level is also far longer than out-of-band specified level numerical value after subtracting 20dB, so, out-of-band interference level is surveyed
Examination frequency can not divert from one use to another the test result of signal band, be generally divided into signal passband according to the division of communication band, neighboring trace leads to
Road, every road passband etc., but according to the actual result of carrier spectrum, it is more difficult, main examination at present to confirm this index
Be whether the harmonic level of carrier signal meets the requirement of out-of-band signal level, as defined in 698 it is out-of-band interference electricity
Flat index is as follows：
(1) maximum interference level of 9kHz~150kHz frequency bands is not more than 60dB μ V；
(2) maximum interference level of 150kHz~500kHz frequency bands is not more than 50dB μ V；
(3) maximum interference level more than 500kHz frequency bands is not more than 46dB μ V.
If out-of-band interference level meets that out-of-band interference level index, criterion are qualified as defined in DL/T 698；Instead
Criterion it is unqualified.
In summary, the present invention gives method according to DL/T 698 and carried out, and the key of the project is the measurement of signal level,
Ensureing the result of level detecting has comparativity；Sampled signal passes through the circuits such as isolation level conversion, send grammed switch, as
Test port, computer gates the sampling that different test ports represents unlike signal, for the sampling of transmitting terminal and receiving terminal
Send frequency spectrograph to measure again, obtain actual carrier level, realize the advantages of measuring stability high anti-jamming capacity is strong.
Claims (5)
1. a kind of signal band and out-of-band interference level method of testing, it is characterised in that：This method includes following order
Step：
(1) terminal starts carrier communication test event, i.e. spiking output level and out-of-band interference level detecting journey
Sequence, carrier communication order is sent to tested concentrator or Copy and reading apparatus by communication interface；
(2) data of tested carrier wave meter are received, judge carrier communication success or not；
(3) test system while by communication interface is notified, industrial computer starts the testing process control program of the project,
(4) after the frequency spectrograph inside test system completes test carrier wave transmission level parameter, industrial computer sends stopping test life
Order；
(5) working condition of test system is adjusted according to carrier communication result, the test of industrial computer storage is read from communication interface
Data simultaneously are completed to handle.
2. signal band according to claim 1 and out-of-band interference level method of testing, it is characterised in that：Computer
When terminal starts carrier communication test event, power conditioner system is added in test system, power conditioner system provides communication and connect
The preferable low-voltage power line simulation test environment of mouth.
3. signal band according to claim 1 and out-of-band interference level method of testing, it is characterised in that：Pass through list
Phase carrier electric energy meter or Three Phase Carrier Based electric energy meter receive the data of tested carrier wave meter, judge carrier communication success or not.
4. signal band according to claim 1 and out-of-band interference level method of testing, it is characterised in that：Industrial computer
When starting the project testing Row control program, test process is monitored using digital oscilloscope, reflects carrier wave in time domain
The actual sequential of communication.
5. signal band according to claim 1 and out-of-band interference level method of testing, it is characterised in that：In step
(5) in, when carrying out data processing, signal band test is carried out according to the standards of DL/T 698, first tests peak signal with frequency spectrograph
Level, then height analysis is carried out to current spectral, a pair of frequencies of 20dB smaller than peak signal off-center frequency are obtained, will
The frequency to frequency is subtracted each other, and is taken absolute value, is obtained current carrier signal band.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710986815.5A CN107612642A (en) | 2017-10-20 | 2017-10-20 | A kind of signal band and out-of-band interference level method of testing |
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| CN201710986815.5A CN107612642A (en) | 2017-10-20 | 2017-10-20 | A kind of signal band and out-of-band interference level method of testing |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108768451A (en) * | 2018-04-28 | 2018-11-06 | 华立科技股份有限公司 | power line carrier integrated test system and test method |
| CN112511242A (en) * | 2020-11-13 | 2021-03-16 | 广西电网有限责任公司南宁供电局 | Carrier detection method and system based on passive isolation |
| CN113691283A (en) * | 2021-09-18 | 2021-11-23 | 广东电网有限责任公司 | Carrier communication equipment performance test platform |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6526260B1 (en) * | 1999-06-24 | 2003-02-25 | Mitel Semiconductor Limited | Cross-channel interference |
| CN101404523A (en) * | 2008-11-19 | 2009-04-08 | 南京新联电子股份有限公司 | Low-voltage powerline carrier communication experiment method and its experiment system |
| CN202524395U (en) * | 2011-11-02 | 2012-11-07 | 华北电网有限公司计量中心 | General test platform for low-voltage carrier automatic meter reading system |
| CN204119227U (en) * | 2014-09-25 | 2015-01-21 | 国家电网公司 | Intelligent electric meter carrier communication module test gimulator |
| CN204156855U (en) * | 2014-10-30 | 2015-02-11 | 国家电网公司 | Carrier communication success rate test macro |
-
2017
- 2017-10-20 CN CN201710986815.5A patent/CN107612642A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6526260B1 (en) * | 1999-06-24 | 2003-02-25 | Mitel Semiconductor Limited | Cross-channel interference |
| CN101404523A (en) * | 2008-11-19 | 2009-04-08 | 南京新联电子股份有限公司 | Low-voltage powerline carrier communication experiment method and its experiment system |
| CN202524395U (en) * | 2011-11-02 | 2012-11-07 | 华北电网有限公司计量中心 | General test platform for low-voltage carrier automatic meter reading system |
| CN204119227U (en) * | 2014-09-25 | 2015-01-21 | 国家电网公司 | Intelligent electric meter carrier communication module test gimulator |
| CN204156855U (en) * | 2014-10-30 | 2015-02-11 | 国家电网公司 | Carrier communication success rate test macro |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108768451A (en) * | 2018-04-28 | 2018-11-06 | 华立科技股份有限公司 | power line carrier integrated test system and test method |
| CN108768451B (en) * | 2018-04-28 | 2021-07-20 | 华立科技股份有限公司 | Power line carrier integrated test system and test method |
| CN112511242A (en) * | 2020-11-13 | 2021-03-16 | 广西电网有限责任公司南宁供电局 | Carrier detection method and system based on passive isolation |
| CN113691283A (en) * | 2021-09-18 | 2021-11-23 | 广东电网有限责任公司 | Carrier communication equipment performance test platform |
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