CN105515613B - Stub cable mixes mesolow power carrier channel decay testing method with aerial - Google Patents
Stub cable mixes mesolow power carrier channel decay testing method with aerial Download PDFInfo
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- CN105515613B CN105515613B CN201510987687.7A CN201510987687A CN105515613B CN 105515613 B CN105515613 B CN 105515613B CN 201510987687 A CN201510987687 A CN 201510987687A CN 105515613 B CN105515613 B CN 105515613B
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- aerial
- cable
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- stub cable
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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
-
- 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 present invention relates to stub cables to mix mesolow power carrier channel decay testing method with aerial, integrated capacitor coupler is installed on the aerial condutor of substation exit stub cable to be measured Yu aerial mixed line junction, it is connected to the first test instrumentation by high frequency cable, which is connected to background processor by a data wire；Clamping-type inductive coupler is installed on the transmission line of electricity other side substation exit cable sheath, the second test instrumentation is connected to by another high frequency cable, test signal by cable shield and the aerial condutor phase line formed and constitutes communication loop between the earth；Start the test device and starts power-line carrier channel attenuation measurement.Stub cable proposed by the invention mixes mesolow power carrier channel decay testing method with aerial, it realizes to power distribution network stub cable and the aerial test for mixing mid & low-voltage line channel attenuation, foundation is provided for the design of power distribution network power-line carrier channel, provides technical support for electric power netting safe running.
Description
Technical field
The present invention relates to the test of power distribution network power-line carrier channel decaying, especially a kind of stub cable is mixed with making somebody a mere figurehead
Low voltage power line carrier channel attenuation test method.
Background technique
Power-line carrier communication is a kind of using Distribution network as communication media, realize data, speech,
The communication technology of the Integrated Services Transmissions such as image acts not only as the effective means for solving broadband access " last 1km ", and
Can for electric power load monitoring and control, remote meter reading, with electricity automation, demand side management, Intranet, wired home and
Digitization community provides high speed data transfer platform.
Power line is designed to conveying electric energy, thus does not have the necessary condition of communication link, and what is presented is
A kind of strong noise, strong decaying, the severe performance such as load variations are violent, impedance variations are big, frequency response is uneven.It realizes reliable
Power line high speed data transfer, it is necessary to solve following problems:
(1) influences of the noises to transmission reliability such as electrical equipment, control equipment, on-air radio electricity are eliminated as much as；
(2) make great efforts letter caused by preventing route, various electrical equipments, impedance fluctuations, impedance mismatch and capacitive load
Number decline；
(3) slow down branch power line and the unbalanced caused multipath fading of network to greatest extent to transmission reliability
It influences.
And distribution line power carrier channel is mixed with aerial for cable, if its pure cable run is too short, to carrier wave function
Rate induction of signal is unfavorable, not can guarantee in most of energy-sensitive to route, it cannot be guaranteed that communication quality, jeopardizes power grid security fortune
Row.According to we engineering test experience have shown that: length be less than 100m cable and aerial mixed line decaying greatly, signal cannot
Normal transmission.And it often happens that in practical projects, therefore proper technology measure need to be taken to be resolved.
Summary of the invention
The purpose of the present invention is to provide stub cables to mix mesolow power carrier channel decay testing method with aerial, leads to
It crosses and exports stub cable to be measured and aerial mixed line junction installation integrated capacitor coupler method in power distribution station, it is existing to overcome
There are existing defects in technology.
To achieve the above object, the technical scheme is that stub cable mixes mesolow power carrier channel with aerial
Decay testing method provides a stub cable and aerial mixed line to be measured, realizes in accordance with the following steps:
S1: integrated capacitor coupler is installed on the aerial condutor at the substation exit of the route side；Described one
Body capacity coupler is connected to the first test instrumentation by a high frequency cable；First test instrumentation is connected by a data line
It is connected to background processor；Clamping-type inductive coupler is installed on the cable sheath at the substation exit of the route other side,
The clamping-type inductive coupler is connected to the second test instrumentation by another high frequency cable, and test signal passes through cable shield
Communication loop is constituted between the phase line and the earth of aerial condutor composition；
S2: first test instrumentation, second test instrumentation and the background processor are connected to exchange
220V power supply；
S3: start first test instrumentation and second test instrumentation, decline to electric power line passage in the route
Subtract and tested, and automatically records and save the pad value of one group of acquisition every TkHz.
In an embodiment of the present invention, the stub cable to be measured and aerial mixed line are 10kV and 10kV or less voltage
The mesolow distribution line of grade, the route both ends are power cable, and wherein one end length is the stub cable line less than 100m
Road, centre are overhead transmission line.
In an embodiment of the present invention, it is installed on the stub cable to be measured and the aerial condutor of aerial mixed line junction
Integrated capacitor coupler installs clamping-type inductive coupler on other end cable sheath.
In an embodiment of the present invention, the aerial condutor of the stub cable to be measured and aerial mixed line junction by A, B,
Tri- phase composition of C, the integrated capacitor coupler are installed on any one phase in A, B, C three-phase.
In an embodiment of the present invention, the stub cable shielded layer two-terminal-grounding, cannot among the stub cable shielded layer
It is directly grounded；If have end among the stub cable, it is grounded among the stub cable shielded layer by inductance, to prevent from surveying
Trial signal directly enters ground by the grounding point among cable.
In an embodiment of the present invention, first test instrumentation and second test instrumentation are a pair of of test signal
Receiver/transmitter, first test instrumentation and the background processor and second test instrumentation infield energy
Exchange installation.
In an embodiment of the present invention, the first examination instrument of surveying is a level selective frequency meter, second test instrumentation
For a level oscillator, the level selective frequency meter and the level oscillator can receive or send 20kHz ~ 500kHz
Signal；The background processor is a power PC processor.
In an embodiment of the present invention, the coaxial cable that the high frequency cable impedance is 75 ohm.
Compared to the prior art, the invention has the following advantages: stub cable proposed by the invention is mixed with aerial
Mesolow power carrier channel decay testing method, passes through the aerial condutor in stub cable to be measured and aerial mixed line junction
Upper installation integrated capacitor coupler, overcomes and clamping-type inductive coupler is directly connected in stub cable crust in conventional method
Above test signal cannot be effectively coupled to distribution line to be measured, cause receiving end test signal that cannot normally detect not
Foot, the method effectively improve the transmission quality of mesolow distribution line signal of communication, meet power distribution network automatic control signal
Transmission requirement, it is ensured that the reliability and safety of operation of power networks.
Detailed description of the invention
Fig. 1 is mesolow power carrier channel attenuation test system connection schematic 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 is not improve mesolow power carrier channel attenuation test system connection schematic diagram in one embodiment of the invention.
Fig. 4 is to connect compared with not improving connection type attenuation test result in one embodiment of the invention by inventive method
Figure.
Fig. 5 is that integrated capacitor coupler and clamping-type inductive coupler and mid & low-voltage line connect in one embodiment of the invention
Connect schematic diagram.
[label declaration]: 1- integrated capacitor coupler；21-75 ohm of high frequency cables；22-75 ohm of high frequency cables；3-
Test signal transmitter；4- background processor；5- clamping-type inductive coupler；6- tests signal receiver；7-RS232 data connect
Wiring.
Specific embodiment
With reference to the accompanying drawing, technical solution of the present invention is specifically described.
The present invention provides a kind of stub cable and mixes mesolow power carrier channel decay testing method with aerial, such as Fig. 1 institute
Show, in accordance with the following steps:
S1: exporting stub cable to be measured in substation 1 and integrated capacitor coupler 1 installed in aerial mixed line junction,
The integrated capacitor coupler 1 is connected to the first test instrumentation 3 by a high frequency cable 21, and the first test instrumentation 3 passes through one
Data line 7 is connected to background processor 4；The installation plug-in electricity on the transmission line of electricity other side substation 2 outlet 2 crust of cable
Feel coupler 5, the second test instrumentation 6 is connected to by another high frequency cable 22, test signal is by cable shield and makes somebody a mere figurehead
Communication loop is constituted between the phase line and the earth of conducting wire composition；
S2: the first test instrumentation 3, the second test instrumentation 6 and background processor 4 are connected to alternating current 220V power supply；
S3: starting test device tests power line channel attenuation in route, and automatically record and protect every TkHz
Deposit the pad value of one group of acquisition.
Further, in the present embodiment, the distribution line that stub cable to be measured and aerial mixed line are 10kV, specific group
At as shown in Fig. 2, the route two ends are power cable, it is that 12m (is less than 100m stub cable line that substation 1, which exports cable length,
Road), centre is overhead transmission line, and length 4km, another 2 outlet section cable length of substation is 500m.
Further, in the present embodiment, stub cable is integrated electricity with the equipment that aerial mixed line junction is installed
Hold coupler, the equipment installed on other end cable sheath is clamping-type inductive coupler, and connection signal is as shown in Figure 5.
Further, in the present embodiment, as shown in figure 5, stub cable shielded layer two-terminal-grounding, centre cannot directly connect
Ground, centre are grounded when having end by inductance, prevent test signal from directly entering ground by the grounding point among cable.
Further, in the present embodiment, the first test instrumentation 3 and the second test instrumentation 6 are that a pair of of test signal receives
Machine/transmitter, the first test instrumentation 3 and background processor 4 can be interchanged with 6 infield of the second test instrumentation.
Further, in the present embodiment, the first test instrumentation 3 is a NR5111A type level selective frequency meter, the second test
Instrument 6 is the comprehensive oscillator of a NR5111B type level, this two instrument can receive or send 20 ~ 500kHz signal；From the background
Processor 4 be a high-performance laptop, for recording, store test data and generate chart.
Further, in the present embodiment, the coaxial cable that high frequency cable 21 and 22 impedances are 75 ohm.
In order to verify effect of the present invention, in the present embodiment, carried according to the connection type of Fig. 3 to mesolow electric power is not improved
Wave channel attenuation test macro is attached, and clamping-type inductive coupler is installed at substation exit stub cable crust, according to
It is tested with Fig. 1 connection type same procedure, two kinds of connection type test results, which compare, sees Fig. 4, and solid line is according to figure in Fig. 4
Test value acquired in 3 connection types (not improving), dotted line are according to test value acquired in Fig. 1 connection type, namely use
Connection type provided by the present invention, can be it is clearly noted not only that according to the pad value of connection type of the present invention than tradition from Fig. 4
Superior 10 ~ the 20dB of connection type is not improved, ensures that normally receiving for signal.
In order to further verify effect of the invention, signal reception condition is tested.In Fig. 1 and Fig. 3 first is surveyed
Examination instrument and the second test instrumentation are changed to a dedicated message transmission/receiver, specific to tie the case where to test packet loss
Fruit sees Tables 1 and 2.As it can be seen from table 1 message accuracy is 100%, and uses and pass using connection type provided by the invention
System does not improve connection type, and message accuracy is only 80% or so, hence it is evident that existing defects.
The connection type packet loss test record of the present invention of table 1
2 tradition of table does not improve connection type packet loss test record
The above are preferred embodiments of the present invention, all any changes made according to the technical solution of the present invention, and generated function is made
When with range without departing from technical solution of the present invention, all belong to the scope of protection of the present invention.
Claims (7)
1. stub cable mixes mesolow power carrier channel decay testing method with aerial, which is characterized in that it is to be measured short to provide one
Cable and aerial mixed line are realized in accordance with the following steps:
S1: integrated capacitor coupler is installed on the aerial condutor at the substation exit of the route side；The integration
Capacity coupler is connected to the first test instrumentation by a high frequency cable；First test instrumentation is connected to by a data line
Background processor；Clamping-type inductive coupler is installed on the cable sheath at the substation exit of the route other side, it is described
Clamping-type inductive coupler is connected to the second test instrumentation by another high frequency cable, and test signal passes through cable shield and frame
Communication loop is constituted between the phase line and the earth of hollow wire composition；
S2: first test instrumentation, second test instrumentation and the background processor are connected to alternating current 220V electricity
Source；
S3: starting first test instrumentation and second test instrumentation, to power line channel attenuation in the route into
Row is tested, and automatically records and save the pad value of one group of acquisition every TkHz, and T is an integer value；
The stub cable to be measured and aerial mixed line are the mesolow distribution line of 10kV and 10kV or less voltage class, should
Route both ends are power cable, and wherein one end length is the stub cable route less than 100m, and centre is overhead transmission line.
2. stub cable according to claim 1 mixes mesolow power carrier channel decay testing method with aerial, special
Sign is: integrated capacitor coupler is installed on the stub cable to be measured and the aerial condutor of aerial mixed line junction,
Clamping-type inductive coupler is installed on other end cable sheath.
3. stub cable according to claim 1 mixes mesolow power carrier channel decay testing method with aerial, special
Sign is: the stub cable to be measured and the aerial condutor of aerial mixed line junction are by tri- phase composition of A, B, C, the integration
Capacity coupler is installed on any one phase in A, B, C three-phase.
4. stub cable according to claim 1 mixes mesolow power carrier channel decay testing method with aerial, special
Sign is: the stub cable shielded layer two-terminal-grounding, cannot be directly grounded among the stub cable shielded layer；If the stub cable
It when there is end in centre, is grounded among the stub cable shielded layer by inductance, to prevent test signal by connecing among cable
Place directly enters ground.
5. stub cable according to claim 1 mixes mesolow power carrier channel decay testing method with aerial, special
Sign is: first test instrumentation and second test instrumentation are a pair of of test signal receiver/transmitter, described the
One test instrumentation and the background processor and second test instrumentation infield can exchange installation.
6. stub cable according to claim 5 mixes mesolow power carrier channel decay testing method with aerial, special
Sign is: first test instrumentation is a level selective frequency meter, and second test instrumentation is a level oscillator, described
Level selective frequency meter and the level oscillator can receive or send 20kHz ~ 500kHz signal；The background processor is
One power PC processor.
7. stub cable according to claim 1 mixes mesolow power carrier channel decay testing method with aerial, special
Sign is: the high frequency cable is the coaxial cable that impedance is 75 ohm.
Priority Applications (1)
| 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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| 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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| Publication Number | Publication Date |
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| CN105515613A CN105515613A (en) | 2016-04-20 |
| CN105515613B true CN105515613B (en) | 2019-01-25 |
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Citations (4)
| 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 |
| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2011223559B2 (en) * | 2010-03-05 | 2016-01-14 | Ambient Corporation | Evaluating noise and excess current on a power line |
-
2015
- 2015-12-25 CN CN201510987687.7A patent/CN105515613B/en active Active
Patent Citations (4)
| 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 |
| 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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| CN105515613A (en) | 2016-04-20 |
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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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