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Arcing horn gap distance

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transformer arching horn
Transformer Arching Horn

It is enough to avoid overvoltage damages on insulation materials is creating a low insulated circuit parallel to insulation material. Arc horns are simple protectjon methods which working by this principle.

When overvoltage reached to bushings, it causes cracks while arcing on surface of bushings and also droping-down on insulations on windings. In order to prevent this, horn-shaped electrodes are connected paralel to the bushings on HV lines.

Once the system started arcing because of overvoltage it goes on arcing under operating voltage too; this is the disadvantage of the system. This causes phase ground short circuit, It can stop by opening breaker.

When altitude increases, air density drops. Thus, after 1000 m for every 100 m dielectric of air drops %1.5. The distance between two electrodes for the altitudes between 1000-1500 m should be chosen %15 above the table below, after 1500 m for each 500 m the distance should be increased %7.5

Here is the arcing horn gap distance:

 

Insulation Voltage Class (kV) Maximum Allowable Working Voltage (kV) Arc Horns Distance VDE 0111/261 (mm) Safety Distances Between Terminals
Phase to Phase (mm) Phase to Ground (mm)
0,5 0,6 - 15 20
1 115 - 25 40
3 3,6 - 50 65
10 12 86 110 115
20 24 155 210 215
30 36 220 280 325
60 72,5 400 500 580
110 123 750 900 1000
150 170 830 1100 1150
220 250 1210 1600 1600
300 330 1600 2100 2100
380 420 2300 2900 2900

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Datsan Transformer has been established in 1992 especially to work in electricity industy. It has finished dozens of project successfully till 2006 and started to manufacture distribution transformers in 2006.

Datsan has manufactured over 10 thousand of distribution transformers till today and exported to more than 15 countries.

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