Maintenance
Electrical wear limits
L51--051EN/01
1/2
11--1999
E ALSTOM
Electrical wear limits
Estimation
Electrical wear can be determined by means of the curve below. This
curve corresponds with the formula :
πNI
2
= 16,000 kA
2
(*)
N = number of interruptions on value I.
Example : it is possible to perform 40 interruptions on a current of 20 kA.
(*) Normal guarantee. In certain special operation conditions, other values
may be guaranteed.
Diagram
10 20 30 50 100 500 1000 3000
2
10
20
40
I(kA)
Number of interruptions
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