Safety information
22
Operating instructions SVCD(S)
123456278
-
419A58
Elektrotechnische Anlagen GmbH
1
Line and contact resistances
The values of current carrying capacity of conductors refer to the most often used cop-
per conductors. Concerning to its higher specific resistance aluminium conductors must
have greater dimensions.
Regardless of which conducting materials are used, the contact terminals of the conduc-
tors have to be low resistive and their number has to be reduced to the necessary mini-
mum.
Too much or too high resistive terminals may result in a unsafe voltage magnification
during the power feedback operation.
M
FC
∆
U
∆
U
∆
U
∆
U
∆
U
∆
U
∆
U
I
Supplying
network
REVCON
Figure 2.6.4
Proceeding from a stable network with e.g. 400V nominal voltage and a backward cur-
rent of 80A, at a bad made terminal of 100mW a voltage of 8V is dropped (A good
made terminal has got a resistance of ca 1 mW.). During feed back operation at seven
serial terminals at the net switch there results a voltage of 456V.
