Arcing horns

Arcing horns

Arcing horns are a pair of conductors (usually steel) used to protect insulators or insulator strings from damage due to system overvoltage conditions.

Location

Arcing horns can be found on transformer bushing insulators, overhead line insulators etc. Sometimes, more than one set are placed across the insulator discs to protect the individual discs against damage.

Principle of operation

Arcing horns form a spark gap that enables any abnormal overvoltage to break down the air gap between the conductors, forming an electrical arc. The hot arc then travels upwards (as hot air rises). The arc becomes increasingly longer as the wires climbs the horn, and is eventually extinguished as it approaches the top of the horns.

Disadvantages

The presence of the arcing horns also necessarily disturbs the normal electric field distribution across the insulator string due to their small but significant capacitance.


Wikimedia Foundation. 2010.

Игры ⚽ Поможем написать курсовую

Look at other dictionaries:

  • Insulator (electrical) — Ceramic insulator at railways Conducting copper wire insulate …   Wikipedia

  • Red Goral — Conservation status …   Wikipedia

  • Spark gap — A spark gap consists of an arrangement of two conducting electrodes separated by a gap usually filled with a gas such as air. When a suitable voltage is supplied, a spark forms, ionizing the gas and drastically reducing its electrical resistance …   Wikipedia

  • Overvoltage — This article is about a concept in electrical engineering. For use in electrochemistry, see overpotential. Voltage spike. When the voltage in a circuit or part of it is raised above its upper design limit, this is known as overvoltage. The… …   Wikipedia

  • Corona ring — Corona rings on 380 kV line insulators …   Wikipedia

  • Tweeter — A tweeter is a loudspeaker designed to produce high frequencies, typically from around 2,000 hertz to 20,000 hertz (20,000 Hz, generally considered to be the upper limit of the human hearing). A few tweeters can manage response up to an octave or …   Wikipedia

  • Loudspeaker — For other uses, see Loudspeaker (disambiguation). An inexpensive, low fidelity 3½ inch speaker, typically found in small radios …   Wikipedia

  • Moby Arena — Location 951 West Plum Street Fort Collins, CO 80523 Opened January 27, 1966 Owner Colorado State University Operator Colorado State University Architect Sink Combs Dethlefs …   Wikipedia

  • Electrostatic loudspeaker — An electrostatic loudspeaker is a loudspeaker design in which sound is generated by the force exerted on a membrane suspended in an electrostatic field.Design and functionalityThe speakers use a thin flat diaphragm usually consisting of a plastic …   Wikipedia

  • List of common misconceptions — This incomplete list is not intended to be exhaustive. This is a list of current, widely held, false ideas and beliefs about notable topics which have been reported by reliable sources from around the world. Each has been discussed in published… …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”