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<p><b>New page</b></p><div>{{Short description|Type of power line warning beacon}}<br />
{{refimprove|date=May 2016}}<br />
[[Image:Balisor-en-ligne.jpg|thumb|right|300px|Photograph showing Balisor beacons in use on high voltage cables]]<br />
'''Balisor''' is a system of illuminated [[beacon]]s for [[high voltage#Power lines|high voltage power lines]] using a cold-cathode low-pressure [[neon lamp]],<ref>David F. Rider '' Jane's airport equipment fifth edition'', Jane's Pub. Co., 1986 page 92</ref> used as an [[aircraft warning light]].<br />
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==Description==<br />
High voltage power cables, particularly those close to [[airport]]s, need to be visible day and night. During the day, brightly coloured balls positioned along the length of the cables are sufficient, but during the night, lighting is necessary. These beacons provide this lighting by glowing red, the standard colour used in aviation for warning beacons.<br />
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The system is extremely simple, efficient and reliable and is considered the most economically viable solution{{Citation needed|date=September 2008}}. Its working principle is attractive, because it uses a phenomenon usually considered as a weakness. However a large disadvantage is that it does not work when the line is switched off. It cannot also be used on [[HVDC]] powerlines, but similar devices may be also used on [[mast radiator]]s.<br />
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==Operating principle==<br />
The interest of the system lies in the way it obtains a power supply directly from the single cable on which it is mounted. It is difficult to obtain a very small amount of energy from a line which transports an enormous amount.<br />
[[Image:Balisor.svg|thumb|right|300px|System diagram]]<br />
Each high voltage cable creates an electric field around itself, in the same way as any live [[electrical conductor]]. When the [[electric potential]] of such a cable is sufficiently high, its electric field causes a significant [[potential difference|voltage difference]] between the cable and its immediate neighbour. (It is the strength of the [[electric field]] that makes it difficult to use low powers.)<br />
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As a result, a second [[Electrical conductor|conductor]] a few metres long, insulated from but parallel to the high voltage cable, will have a potential different from that of the main cable. Together the conductors make a [[capacitor]] charged across an air gap ([[dielectric]]).<br />
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Under certain conditions, the accumulated charge (and hence the potential difference) is sufficient to trigger a [[discharge lamp]]. This what is used in practice, giving a reliable and robust beacon.<br />
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==See also==<br />
* [[Aviation obstruction lighting]]<br />
* [[Overhead wire marker]]<br />
* [[Rogowski coil]], a device that gets energy from the magnetic field, instead of the electric field<br />
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==References==<br />
<references/><br />
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==External links==<br />
{{Portal|Energy|Electronics|Aviation}}<br />
* On the [https://obsta.com/en/ manufacturer's site] : Obsta<br />
**[https://obsta.com/en/specialist-in-obstruction-lighting Presentation]<br />
**[https://obsta.com/fr/ligne-haute-tension---balisor Product Range]<br />
<!-- **[http://www.obsta.com/img/Balisor.html Operating Principle] --><br />
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[[Category:Aviation safety]]<br />
[[Category:Beacons| ]]<br />
[[Category:Electric power transmission systems]]<br />
[[Category:Signalling lights]]<br />
[[Category:Warning systems]]</div>wikipedia>Leomos23