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Jännitetason tunnistaminen

Suomessa käytetään voimajohtojen jännitetasoina 110, 220 ja 400 kilovolttia (kV). 1 kV = 1000 volttia (V). Jännitetason tunnistaa eristinketjun pituuden ja eristinlautasten lukumäärän perusteella.  

Voimajohdon 
jännitetaso​		 Eristinketjun pituus​ ​Eristinlautastenlukumäärä

110 kV

noin 1 metri​

6–8

220 kV​

​noin 2 metriä

10–12
​
400 kV

noin 4 metriä​
​
18–21

 

Alla olevassa kuvassa on havainnollistettu eristinketjun ja -lautasten sijainti voimajohtopylväissä.

Fingrid_eristinketju_lautanen_2.png