Maintenance
Limit of electrical wear
P51--0501EN/02
1/2
01--2011
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GRID
Limit of electrical wear
Estimate
L’Electrical wear can be estimated according to the curve below. This
curve corresponds to the formula :
ΣNI
2
= 15 000 kA
2
(*)
N = nuomber of breaks at a value I.
For example, a current of 25 kA can be broken 24 times.
(*) Normal warranty. For particular uses other values can be guaranteed.
Illustration
10 20 30 50 100 500 1000 3000
2
10
20
50
I(kA)
Number of breaks
25
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