CA1142578A - Power transmission overhead line - Google Patents
Power transmission overhead lineInfo
- Publication number
- CA1142578A CA1142578A CA000353099A CA353099A CA1142578A CA 1142578 A CA1142578 A CA 1142578A CA 000353099 A CA000353099 A CA 000353099A CA 353099 A CA353099 A CA 353099A CA 1142578 A CA1142578 A CA 1142578A
- Authority
- CA
- Canada
- Prior art keywords
- sections
- wires
- overhead line
- power transmission
- spacing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G13/00—Installations of lightning conductors; Fastening thereof to supporting structure
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G7/00—Overhead installations of electric lines or cables
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G7/00—Overhead installations of electric lines or cables
- H02G7/20—Spatial arrangements or dispositions of lines or cables on poles, posts or towers
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G7/00—Overhead installations of electric lines or cables
- H02G7/22—Arrangements of earthing wires suspended between mastheads
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2203/00—Indexing scheme relating to line transmission systems
- H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
- H04B2203/5462—Systems for power line communications
- H04B2203/5466—Systems for power line communications using three phases conductors
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2203/00—Indexing scheme relating to line transmission systems
- H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
- H04B2203/5462—Systems for power line communications
- H04B2203/5483—Systems for power line communications using coupling circuits
- H04B2203/5487—Systems for power line communications using coupling circuits cables
Abstract
POWER TRANSMISSION OVERHEAD LINE
Abstract of the Disclosure A power transmission overhead line comprising a lightn-ing protection system which also serves to transmit informa-tion in the form of r.f. signals. The system has at least one section in which the spacing between its wires is made variable through the length thereof so that the ratio of the spacing between the wires at the middle portion of the section to the spacing between them at any one of the ends of the line is greater than unity and less than 20.
Abstract of the Disclosure A power transmission overhead line comprising a lightn-ing protection system which also serves to transmit informa-tion in the form of r.f. signals. The system has at least one section in which the spacing between its wires is made variable through the length thereof so that the ratio of the spacing between the wires at the middle portion of the section to the spacing between them at any one of the ends of the line is greater than unity and less than 20.
Description
11 ~2578 , The invention relates to means for transmitting electric energy over long distances, and more particularly to overhead lines for power transmission.
The invention is suitable for use in transmitting electric energy as well as information in the form of r.f.
signals passing through communication channels.
Known in the art is a power transmission overhead line having a lightning protection system having a single wire which also conveys information in the form of r.f.
signals.
There is a power transmission overhead line pro-vided with 2 lightning system having two wires which are spaced apart, a spacing therebetween being maintained approx-imately constant through the line length.
With ice-snow deposits on the wireS~ there results a considerable attenuation of the r.f. signals being trans-mitted, with the result that the signal-noise ratio is re-duced and the quality of the communication channels is im-paired.
An object of the invention is to provide a power transmission overhead line incorporating communication channels which convey r.f. signals not subject to consider-able attenuation.
Another object of the invention is to provide for greater noise immunity of said communication channels.
In accordance with the invention, there is pro-vided a power transmission overhead line consisting of phase conductors to transmit electric energy. A lightning protection system transmists information in the form of r.f. signals, the lightning protection system being pro-vided with at least one pair of wires arranged in a space relation t~ each other. Also included is a first section of the overhead line within which an approximately con-stant spacing between the wires is available. A second, and at least one, section of the overhead line within which the wires of the lightning protection system are spaced ~ ' apart by a spacing which varies through the length of the section in a manner that the ratio between its value at the middle portion of a respective one of the second sections and its value within any one of the first sections is more than unity and less than 20 is also provided. One of the first sections is located at the beginning and the end of the overhead Iine. The first and sècond sections are arranged in alternate relation along the length of the overhead line.
Advantageously, the ratio between the length of that section of the power transmission line within which the spacing between the wires is maintained constant and the length of the section thereof within which that spacing is variable should be within a range from 0.1 to 3.
The invention will now be described in more detail with reference to the accompanying drawings in which:
Figure 1 shows a power transmission overhead line, according to the invention, and Figure 2 shows a section of a lightning protection system, according to the invention.
The power transmission overhead line comprises, according to the invention, a plurality of supports 1 (Fig. 1) which mount phase conductors 2 adapted to transmit electric energy, The supports 1 carry insulator strings 3 of a lightning protection system, which strings mounting wires 4,5.
, ~ .
~ , 11'~2~78 The wires 4,~ are spaced apart by a spacing 11. The over-head line is divided into a plurality of sections I - II, II - III, IV - V, and V - VI. The number o~ the sectio~s de-pend~ on the length of the li~e and on the environmental con-ditions existing in the areas through which the line is pas-sed.
It is good practice, for those region~ in which ice--snow deposits on the wires are po~sible, to select corres-ponding sections of the line in ~hich the wires 4,5 are spaced apart by a spacing 12 (Fig. 2), said ~pacing ~arying according to the lengths of the sections. ~here are sections II-III, III-IV, IV-Y of the above-mentioned character in Figure 1.
A receive-transmit unit 6 designed to receive and transmit information in the form of r.f. signals is connected to the wires 4,5 via a coupling capacitor 7 and a filter 8.
- ~he ratio ~ is selected in accordance with the follow-~ng inequality~ 20. To resist the reflection of elec-tromagnetic wave-q at the points where the spacing between the wires ~aries from 11 to 12 (sections II-III and IV-V in Fig.
1), a transition portion is made gradual.
If the above ratio exceeds a value of 20, an asymmetry in relatio~ to the pha~e conductors 2 takes place and the in-terference le~el in the communication channel is there~ore drastically increased.
Si~ce the quality of the communicat1on channel is deter-mi~ed by the signal-noiqe ratio ~ , the noise le~el PN at the 11'~2578 reception point is low when the spacing bet~een the wires 4,5 is equal to 11, with ~ ~1; but the signal level P will be low in this case too. As a result, the signal-noise ratio varies a little and no improveme~t oi the channel quality ta~es place.
There may ~e a plurality o~ sections o~ the entire line (~ig. 2) in which the spacing between the wires 4,5 differs from the analogous spacing measured at any one of the ends of the line. ~herefore, these sections may be arra~ged in alternate relation to such sections oi the line in which said spacing is equal to that mea~ured at any one of the ends of the line.
An optimum Yalue o~ the signal-noise ratio is preferably attained ~ith a ratio ~ within a range from 0.1 to 3, whe-re ~1 i8 the length of the section I-II with a constant spac-ing 11 and ~2 is the length of the section II-V with a va-riable spaci~g 12.
The abo~e limits satisfy the requirement according to which the noise level PN at the recei~er input, obtainable from a section with spacing 12, doeq not exceed the noise le-~el PN characteristic of a section oi the line oi constant spacing 11.
~ he pre~ent in~ention ma~es it possible to impro~e the qu~lit~ o~ communication channels and, therefore, the leDgth oi the repeater ~ections of the channel~. In addition, a con-_ 5 _ siderable saving in the e~penditures for the constructio~
and maintenance o~ overhead lines is attained.
The invention is suitable for use in transmitting electric energy as well as information in the form of r.f.
signals passing through communication channels.
Known in the art is a power transmission overhead line having a lightning protection system having a single wire which also conveys information in the form of r.f.
signals.
There is a power transmission overhead line pro-vided with 2 lightning system having two wires which are spaced apart, a spacing therebetween being maintained approx-imately constant through the line length.
With ice-snow deposits on the wireS~ there results a considerable attenuation of the r.f. signals being trans-mitted, with the result that the signal-noise ratio is re-duced and the quality of the communication channels is im-paired.
An object of the invention is to provide a power transmission overhead line incorporating communication channels which convey r.f. signals not subject to consider-able attenuation.
Another object of the invention is to provide for greater noise immunity of said communication channels.
In accordance with the invention, there is pro-vided a power transmission overhead line consisting of phase conductors to transmit electric energy. A lightning protection system transmists information in the form of r.f. signals, the lightning protection system being pro-vided with at least one pair of wires arranged in a space relation t~ each other. Also included is a first section of the overhead line within which an approximately con-stant spacing between the wires is available. A second, and at least one, section of the overhead line within which the wires of the lightning protection system are spaced ~ ' apart by a spacing which varies through the length of the section in a manner that the ratio between its value at the middle portion of a respective one of the second sections and its value within any one of the first sections is more than unity and less than 20 is also provided. One of the first sections is located at the beginning and the end of the overhead Iine. The first and sècond sections are arranged in alternate relation along the length of the overhead line.
Advantageously, the ratio between the length of that section of the power transmission line within which the spacing between the wires is maintained constant and the length of the section thereof within which that spacing is variable should be within a range from 0.1 to 3.
The invention will now be described in more detail with reference to the accompanying drawings in which:
Figure 1 shows a power transmission overhead line, according to the invention, and Figure 2 shows a section of a lightning protection system, according to the invention.
The power transmission overhead line comprises, according to the invention, a plurality of supports 1 (Fig. 1) which mount phase conductors 2 adapted to transmit electric energy, The supports 1 carry insulator strings 3 of a lightning protection system, which strings mounting wires 4,5.
, ~ .
~ , 11'~2~78 The wires 4,~ are spaced apart by a spacing 11. The over-head line is divided into a plurality of sections I - II, II - III, IV - V, and V - VI. The number o~ the sectio~s de-pend~ on the length of the li~e and on the environmental con-ditions existing in the areas through which the line is pas-sed.
It is good practice, for those region~ in which ice--snow deposits on the wires are po~sible, to select corres-ponding sections of the line in ~hich the wires 4,5 are spaced apart by a spacing 12 (Fig. 2), said ~pacing ~arying according to the lengths of the sections. ~here are sections II-III, III-IV, IV-Y of the above-mentioned character in Figure 1.
A receive-transmit unit 6 designed to receive and transmit information in the form of r.f. signals is connected to the wires 4,5 via a coupling capacitor 7 and a filter 8.
- ~he ratio ~ is selected in accordance with the follow-~ng inequality~ 20. To resist the reflection of elec-tromagnetic wave-q at the points where the spacing between the wires ~aries from 11 to 12 (sections II-III and IV-V in Fig.
1), a transition portion is made gradual.
If the above ratio exceeds a value of 20, an asymmetry in relatio~ to the pha~e conductors 2 takes place and the in-terference le~el in the communication channel is there~ore drastically increased.
Si~ce the quality of the communicat1on channel is deter-mi~ed by the signal-noiqe ratio ~ , the noise le~el PN at the 11'~2578 reception point is low when the spacing bet~een the wires 4,5 is equal to 11, with ~ ~1; but the signal level P will be low in this case too. As a result, the signal-noise ratio varies a little and no improveme~t oi the channel quality ta~es place.
There may ~e a plurality o~ sections o~ the entire line (~ig. 2) in which the spacing between the wires 4,5 differs from the analogous spacing measured at any one of the ends of the line. ~herefore, these sections may be arra~ged in alternate relation to such sections oi the line in which said spacing is equal to that mea~ured at any one of the ends of the line.
An optimum Yalue o~ the signal-noise ratio is preferably attained ~ith a ratio ~ within a range from 0.1 to 3, whe-re ~1 i8 the length of the section I-II with a constant spac-ing 11 and ~2 is the length of the section II-V with a va-riable spaci~g 12.
The abo~e limits satisfy the requirement according to which the noise level PN at the recei~er input, obtainable from a section with spacing 12, doeq not exceed the noise le-~el PN characteristic of a section oi the line oi constant spacing 11.
~ he pre~ent in~ention ma~es it possible to impro~e the qu~lit~ o~ communication channels and, therefore, the leDgth oi the repeater ~ections of the channel~. In addition, a con-_ 5 _ siderable saving in the e~penditures for the constructio~
and maintenance o~ overhead lines is attained.
Claims (3)
1. A power transmission overhead line comprising phase conductors to transmit electric energy; a lightning protect-ion system to transmit information in the form of r.f. sig-nals, said lightning protection system being provided with at least one pair of wires arranged in a spaced relation to each other; a first section of the overhead line within which an approximately constant spacing between said wires is available; a second, and at least one, section of the over-head line within which said wires of said lightning protection system are spaced apart by a spacing which varies through the length of the section in a manner that the ratio between its value at the middle portion of a respective one of said second sections and its value within any one of said first sections is more than unity and less than 20; one of said first sec-tions located at the beginning and the end of the overhead li-ne; said first and second sections arranged in alternate re-lation along the length of the overhead line.
2. A power transmission overhead line as claimed in claim 1, wherein the ratio of the length of any of said first sections to the length of any of said second sections is wit-hin a range from 0.1 to 3.
3. A power transmission overhead line as claimed in any of claims 1,2, wherein the ratio of the second between said wires at the middle portion of a given second section to the spacing between them within any one of said first sections of the line is within a range from 2 to 5.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/SU1980/000009 WO1981002227A1 (en) | 1980-01-30 | 1980-01-30 | Overhead electric line |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1142578A true CA1142578A (en) | 1983-03-08 |
Family
ID=21616580
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000353099A Expired CA1142578A (en) | 1980-01-30 | 1980-05-30 | Power transmission overhead line |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JPS57500044A (en) |
| AU (1) | AU540121B2 (en) |
| CA (1) | CA1142578A (en) |
| DE (1) | DE3050261C1 (en) |
| SE (1) | SE425585B (en) |
| WO (1) | WO1981002227A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106153097A (en) * | 2016-06-27 | 2016-11-23 | 中国电力科学研究院 | --icing insulator string icing degree characterizing method |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE403435C (en) * | 1924-10-02 | Drahtlose Telegraphie M B H Ge | Equipment for high frequency telegraphy in power networks | |
| SU399030A1 (en) * | 1971-02-16 | 1973-09-27 | HIGH VOLTAGE ELECTRICAL TRANSMISSION LINE | |
| SU424267A1 (en) * | 1971-07-12 | 1974-04-15 | А. И. Гершенгорн, Ю. И. Лысков , И. Я. Мельзак | THREE-PHASE HIGH VOLTAGE TRANSMISSION LINE |
| SU456371A1 (en) * | 1972-06-07 | 1975-01-05 | Отделение Дальних Передач Всесоюзного Государственного Проектноизыскательного Научно-Исследовательского Института "Энергосетьпроект" | High-frequency channel for ground wire transmission lines |
| SU517971A1 (en) * | 1974-04-02 | 1976-06-15 | Ордена Октябрьской Революции Всесоюзный Государственный Проектно-Изыскательский И Научно-Исследовательский Институт Энергетических Систем И Электрических Сетей "Энергосетьпроект" | High Voltage Power Line |
-
1980
- 1980-01-30 JP JP55501686A patent/JPS57500044A/ja active Pending
- 1980-01-30 DE DE3050261A patent/DE3050261C1/en not_active Expired
- 1980-01-30 WO PCT/SU1980/000009 patent/WO1981002227A1/en active Application Filing
- 1980-05-30 CA CA000353099A patent/CA1142578A/en not_active Expired
- 1980-06-04 AU AU59095/80A patent/AU540121B2/en not_active Ceased
-
1981
- 1981-09-16 SE SE8105507A patent/SE425585B/en not_active IP Right Cessation
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106153097A (en) * | 2016-06-27 | 2016-11-23 | 中国电力科学研究院 | --icing insulator string icing degree characterizing method |
| CN106153097B (en) * | 2016-06-27 | 2020-09-25 | 中国电力科学研究院 | Icing degree characterization method for icing insulator string |
Also Published As
| Publication number | Publication date |
|---|---|
| SE425585B (en) | 1982-10-11 |
| AU540121B2 (en) | 1984-11-01 |
| AU5909580A (en) | 1981-12-10 |
| JPS57500044A (en) | 1982-01-07 |
| DE3050261C1 (en) | 1984-09-06 |
| WO1981002227A1 (en) | 1981-08-06 |
| SE8105507L (en) | 1981-09-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |