CN105515613A - Attenuation test method of short cable and overhead mixed middle-low voltage power carrier channel - Google Patents
Attenuation test method of short cable and overhead mixed middle-low voltage power carrier channel Download PDFInfo
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- CN105515613A CN105515613A CN201510987687.7A CN201510987687A CN105515613A CN 105515613 A CN105515613 A CN 105515613A CN 201510987687 A CN201510987687 A CN 201510987687A CN 105515613 A CN105515613 A CN 105515613A
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- cable
- test
- carrier channel
- stub cable
- test instrumentation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/46—Monitoring; Testing
- H04B3/48—Testing attenuation
Abstract
The invention relates to an attenuation test method of a short cable and overhead mixed middle-low voltage power carrier channel. An integrated capacitive coupler is installed on the overhead lead at the junction of a short cable and overhead mixed line at the outlet of a substation; the integrated capacitive coupler is connected to a first test instrument through a high frequency cable; the test instrument is connected to a backstage processor through a data cable; a clamping type inductive coupler is installed on the outer skin of the cable at the outlet of the substation at the other side of the power transmission line; the clamping type inductive coupler is connected to a second test instrument through another high frequency cable; a communication loop is formed between test signals and the earth through the phase line formed by a cable shielding layer and the overhead lead; the attenuation measurement of the power line carrier channel is started by starting the test device. According to the attenuation test method of the short cable and overhead mixed middle-low voltage power carrier channel provided by the invention, the attenuation of the short cable and overhead mixed middle-low voltage line channel of a power distribution network is tested; the basis is provided for designing the power line carrier channel of the power distribution network; and the technical support is provided for safe operation of the power grid.
Description
Technical field
The test, particularly a kind of stub cable that the present invention relates to the decay of power distribution network power-line carrier channel mix mesolow power-line carrier channel decay testing method with built on stilts.
Background technology
Power-line carrier communication is that one utilizes Distribution network as communication media, realize the communication technology of the Integrated Services Transmission such as data, speech, image, not only as the effective means solving broadband access " last 1km ", and can provide high speed data transfer platform for electric power load monitoring and control, remote meter reading, adapted electric automation, dsm, Intranet, wired home and digitization community.
The severe performances such as power line is that design is used for transmission of electric energy, does not thus have the necessary condition of communication link, and what present is a kind of strong noise, overdamp, load variations is violent, impedance variation is large, frequency response is uneven.Realize reliable power line high speed data transfer, following problem must be solved:
(1) noises such as electric equipment, control appliance, on-air radio electricity are eliminated as far as possible on the impact of transmission reliability;
(2) signal fadeout stoping circuit, various electric equipment, impedance fluctuations, impedance mismatch and capacitive load to cause is made great efforts;
(3) branch power line and the unbalanced multipath fading caused of network is slowed down to greatest extent on the impact of transmission reliability.
And with built on stilts, distribution line power carrier channel is mixed for cable, and if its pure cable line is too short, unfavorable to carrier power induction of signal, cannot ensure that most of energy-sensitive is on circuit, communication quality can not be ensured, jeopardize electric power netting safe running.Show according to our engineering test experience: length is less than 100m cable and aerial mixed line is decayed greatly, and signal can not normally transmit.And it often happens that in Practical Project, therefore need to take proper technology measure to be solved.
Summary of the invention
Stub cable is the object of the present invention is to provide to mix mesolow power carrier channel decay testing method with built on stilts, by exporting stub cable to be measured at power distribution station and integrated capacitor coupler way is installed in aerial mixed line junction, to overcome existing defects in prior art.
For achieving the above object, technical scheme of the present invention is: stub cable mixes mesolow power carrier channel decay testing method with built on stilts, provides stub cable to be measured and an aerial mixed line, realizes in accordance with the following steps:
S1: install integrated capacitor coupler on the aerial condutor at substation exit place, described circuit side; Described integrated capacitor coupler is connected to the first test instrumentation by a high frequency cable; Described first test instrumentation is connected to background processor by a data wire; Clamping-type inductive coupler installed by the cable sheath at described circuit opposite side substation exit place, described clamping-type inductive coupler is connected to the second test instrumentation by another high frequency cable, forms communication loop between the phase line that test signal consists of cable shield and aerial condutor and the earth;
S2: described first test instrumentation, described second test instrumentation and described background processor are all connected to alternating current 220V power supply;
S3: start described first test instrumentation and described second test instrumentation, power line channel attenuation in described circuit is tested, and automatically record and preserve one group of pad value gathered every TkHz.
In an embodiment of the present invention, described stub cable to be measured and aerial mixed line are the mesolow distribution line of 10kV and below 10kV electric pressure, these circuit two ends are power cable, and wherein one end length is the stub cable circuit being less than 100m, and centre is overhead transmission line.
In an embodiment of the present invention, integrated capacitor coupler installed by the aerial condutor of described stub cable to be measured and aerial mixed line junction, clamping-type inductive coupler installed by other end cable sheath.
In an embodiment of the present invention, the aerial condutor of described stub cable to be measured and aerial mixed line junction is by A, B, C tri-phase composition, and described integrated capacitor coupler is installed on any phase in A, B, C three-phase.
In an embodiment of the present invention, described stub cable screen two-terminal-grounding, can not direct ground connection in the middle of described stub cable screen; If when having cable end in the middle of described stub cable, by inductance ground connection in the middle of described stub cable screen, directly enter ground to prevent test signal by the earth point in the middle of cable.
In an embodiment of the present invention, described first test instrumentation and described second test instrumentation are a pair test signal receiver/transmitter, and described first test instrumentation and described background processor and described second test instrumentation infield can exchange installs.
In an embodiment of the present invention, it is a level selective frequency meter that described survey first tries instrument, and described second test instrumentation is a level oscillator, and described level selective frequency meter and described level oscillator all can receive or send 20kHz ~ 500kHz signal; Described background processor is a power PC processor.
In an embodiment of the present invention, described high frequency cable impedance is the coaxial cable of 75 ohm.
Compared to prior art, the present invention has following beneficial effect: stub cable proposed by the invention mixes mesolow power carrier channel decay testing method with built on stilts, by installing integrated capacitor coupler on the aerial condutor of stub cable to be measured and aerial mixed line junction, overcome and in conventional method, clamping-type inductive coupler be directly connected on stub cable crust and test signal can not be coupled to effectively distribution line to be measured, cause the deficiency that receiving terminal test signal can not normally detect, the method effectively improves the transmission quality of mesolow distribution line signal of communication, meet the transmission requirement of power distribution network automatic control signal, guarantee reliability and the fail safe of operation of power networks.
Accompanying drawing explanation
Fig. 1 is mesolow power carrier channel attenuation test system connection diagram in the present invention.
Fig. 2 is mid & low-voltage line composition schematic diagram to be measured in one embodiment of the invention.
Fig. 3 does not improve mesolow power carrier channel attenuation test system connection diagram in one embodiment of the invention.
Fig. 4 connects by inventive method in one embodiment of the invention and does not improve connected mode attenuation test results contrast figure.
Fig. 5 is integrated capacitor coupler and clamping-type inductive coupler and mid & low-voltage line connection diagram in one embodiment of the invention.
[label declaration]: 1-integrated capacitor coupler; 21-75 ohm high frequency cable; 22-75 ohm high frequency cable; 3-test signal transmitter; 4-background processor; 5-clamping-type inductive coupler; 6-test signal receiver; 7-RS232 data connecting line.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is specifically described.
The invention provides a kind of stub cable and mix mesolow power carrier channel decay testing method with built on stilts, as shown in Figure 1, in accordance with the following steps:
S1: export stub cable to be measured and integrated capacitor coupler 1 is installed in aerial mixed line junction in transformer station 1, this integrated capacitor coupler 1 is connected to the first test instrumentation 3, first test instrumentation 3 by a high frequency cable 21 and is connected to background processor 4 by a data lines 7; Export on cable 2 crust in this transmission line opposite side transformer station 2 and clamping-type inductive coupler 5 is installed, be connected to the second test instrumentation 6 by another high frequency cable 22, between the phase line that test signal consists of cable shield and aerial condutor and the earth, form communication loop;
S2: the first test instrumentation 3, second test instrumentation 6 and background processor 4 are all connected to alternating current 220V power supply;
S3: start testing apparatus, power line channel attenuation in circuit is tested, and automatically record and preserve one group of pad value gathered every TkHz.
Further, in the present embodiment, stub cable to be measured and aerial mixed line are the distribution line of 10kV, concrete composition as shown in Figure 2, this circuit two ends is power cable, and it is 12m (being less than 100m stub cable circuit) that transformer station 1 exports cable length, and centre is overhead transmission line, length is 4km, and another transformer station 2 outlet section cable length is 500m.
Further, in the present embodiment, the integrated capacity coupler of equipment that stub cable and aerial mixed line junction are installed, the equipment that other end cable sheath is installed is clamping-type inductive coupler, and it connects signal as shown in Figure 5.
Further, in the present embodiment, as shown in Figure 5, stub cable screen two-terminal-grounding, centre can not direct ground connection, by inductance ground connection when there is a cable end centre, prevents test signal from directly entering ground by the earth point in the middle of cable.
Further, in the present embodiment, the first test instrumentation 3 and the second test instrumentation 6 are a pair test signal receiver/transmitter, and the first test instrumentation 3 and background processor 4 and the second test instrumentation 6 infield can exchange.
Further, in the present embodiment, the first test instrumentation 3 is a NR5111A type level selective frequency meter, and the second test instrumentation 6 is a comprehensive oscillator of NR5111B type level, and these two instrument can receive or send 20 ~ 500kHz signal; Background processor 4 is a high-performance notebook computer, for record, store test data and generation chart.
Further, in the present embodiment, high frequency cable 21 and 22 impedance is the coaxial cable of 75 ohm.
In order to verify effect of the present invention, in the present embodiment, connect not improving mesolow power carrier channel attenuation test system according to the connected mode of Fig. 3, at substation exit stub cable crust place, clamping-type inductive coupler is installed, test according to Fig. 1 connected mode same procedure, two kinds of connected mode test results compare sees Fig. 4, the test value of solid line for obtaining according to Fig. 3 connected mode (improvement) in Fig. 4, the test value of dotted line for obtaining according to Fig. 1 connected mode, also connected mode provided by the present invention is namely adopted, can find out clearly from Fig. 4, superior 10 ~ the 20dB of connected mode is not improved than tradition according to the pad value of connected mode of the present invention, thus ensure that the normal reception of signal.
In order to verify effect of the present invention further, Signal reception situation is tested.First test instrumentation in Fig. 1 and Fig. 3 and the second test instrumentation are replaced by a special message sending/receiving machine, in order to test the situation of packet loss, concrete outcome is in table 1 and table 2.As can be seen from Table 1, adopt connected mode provided by the invention, message accuracy is 100%, and adopts tradition not improve connected mode, and its message accuracy is only about 80%, obvious existing defects.
The test record of table 1 connected mode packet loss of the present invention
Table 2 tradition does not improve the test record of connected mode packet loss
Be more than preferred embodiment of the present invention, all changes done according to technical solution of the present invention, when the function produced does not exceed the scope of technical solution of the present invention, all belong to protection scope of the present invention.
Claims (8)
1. stub cable mixes mesolow power carrier channel decay testing method with built on stilts, it is characterized in that, provides stub cable to be measured and an aerial mixed line, realizes in accordance with the following steps:
S1: install integrated capacitor coupler on the aerial condutor at substation exit place, described circuit side; Described integrated capacitor coupler is connected to the first test instrumentation by a high frequency cable; Described first test instrumentation is connected to background processor by a data wire; Clamping-type inductive coupler installed by the cable sheath at described circuit opposite side substation exit place, described clamping-type inductive coupler is connected to the second test instrumentation by another high frequency cable, forms communication loop between the phase line that test signal consists of cable shield and aerial condutor and the earth;
S2: described first test instrumentation, described second test instrumentation and described background processor are all connected to alternating current 220V power supply;
S3: start described first test instrumentation and described second test instrumentation, power line channel attenuation in described circuit is tested, and automatically record and preserve one group of pad value gathered every TkHz.
2. stub cable according to claim 1 mixes mesolow power carrier channel decay testing method with built on stilts, it is characterized in that: described stub cable to be measured and aerial mixed line are the mesolow distribution line of 10kV and below 10kV electric pressure, these circuit two ends are power cable, and wherein one end length is the stub cable circuit being less than 100m, centre is overhead transmission line.
3. stub cable according to claim 1 mixes mesolow power carrier channel decay testing method with built on stilts, it is characterized in that: integrated capacitor coupler installed by the aerial condutor of described stub cable to be measured and aerial mixed line junction, clamping-type inductive coupler installed by other end cable sheath.
4. stub cable according to claim 1 mixes mesolow power carrier communication system with built on stilts, it is characterized in that: the aerial condutor of described stub cable to be measured and aerial mixed line junction is by A, B, C tri-phase composition, and described integrated capacitor coupler is installed on any phase in A, B, C three-phase.
5. stub cable according to claim 1 mix mesolow power carrier channel decay testing method with built on stilts, it is characterized in that: described stub cable screen two-terminal-grounding, and described stub cable screen centre can not direct ground connection; If when having cable end in the middle of described stub cable, by inductance ground connection in the middle of described stub cable screen, directly enter ground to prevent test signal by the earth point in the middle of cable.
6. a kind of stub cable according to claim 1 mixes mesolow power carrier channel decay testing method with built on stilts, it is characterized in that: described first test instrumentation and described second test instrumentation are a pair test signal receiver/transmitter, described first test instrumentation and described background processor and described second test instrumentation infield can exchange installs.
7. stub cable according to claim 6 mixes mesolow power carrier channel decay testing method with built on stilts, it is characterized in that: it is a level selective frequency meter that described survey first tries instrument, described second test instrumentation is a level oscillator, and described level selective frequency meter and described level oscillator all can receive or send 20kHz ~ 500kHz signal; Described background processor is a power PC processor.
8. stub cable according to claim 1 mixes mesolow power carrier channel decay testing method with built on stilts, it is characterized in that: described high frequency cable impedance is the coaxial cable of 75 ohm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510987687.7A CN105515613B (en) | 2015-12-25 | 2015-12-25 | Stub cable mixes mesolow power carrier channel decay testing method with aerial |
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| CN201510987687.7A CN105515613B (en) | 2015-12-25 | 2015-12-25 | Stub cable mixes mesolow power carrier channel decay testing method with aerial |
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| CN105515613A true CN105515613A (en) | 2016-04-20 |
| CN105515613B CN105515613B (en) | 2019-01-25 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102111189A (en) * | 2011-04-11 | 2011-06-29 | 福建省电力有限公司宁德电业局 | Long-distance high-speed broadband power line communication method |
| US20130006560A1 (en) * | 2010-03-05 | 2013-01-03 | Ambient Corporation | Evaluating noise and excess current on a power line |
| CN103558219A (en) * | 2013-11-19 | 2014-02-05 | 国家电网公司 | Power cable service life monitoring realization method based on shielding layer wave carrier communication |
| CN203748818U (en) * | 2014-04-08 | 2014-08-06 | 卢山 | Ultra-thin mobile terminal three-proofing protective cover |
| CN203968116U (en) * | 2014-07-01 | 2014-11-26 | 国家电网公司 | Joint line carrier communication apparatus |
-
2015
- 2015-12-25 CN CN201510987687.7A patent/CN105515613B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130006560A1 (en) * | 2010-03-05 | 2013-01-03 | Ambient Corporation | Evaluating noise and excess current on a power line |
| CN102111189A (en) * | 2011-04-11 | 2011-06-29 | 福建省电力有限公司宁德电业局 | Long-distance high-speed broadband power line communication method |
| CN103558219A (en) * | 2013-11-19 | 2014-02-05 | 国家电网公司 | Power cable service life monitoring realization method based on shielding layer wave carrier communication |
| CN203748818U (en) * | 2014-04-08 | 2014-08-06 | 卢山 | Ultra-thin mobile terminal three-proofing protective cover |
| CN203968116U (en) * | 2014-07-01 | 2014-11-26 | 国家电网公司 | Joint line carrier communication apparatus |
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Inventor after: Chen Zhuolin Inventor after: Tang Yuanchun Inventor after: Zhang Fenfen Inventor after: Li Jie Inventor before: Zhuo Xiuzhe Inventor before: Tang Yuanchun Inventor before: Zhang Fenfen Inventor before: Li Jie |
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