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Insulated conductor system U20, U30, U40 - VAHLE - #7

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Text version of the page
selection of conductors ZT
b) If the ambient temperature is above +35° C the max. conductor rail ampacity (Izul) must be reduced with the derating factors from Table 5.
Izul UT = Izul ' fl
Table 5: Derating factors
Ambient temperature °C
35
40
45
50
55
60
65
70
75
80
85
Correction factor fT Standard shroud
1
0.95
0.89
0.84
0.77
-
-
-
-
-
-
Correction factor fT High temp. shroud and current collector
1
0.97
0.94
0.90
0.87
0.83
0.79
0.75
0.71
0.66
0.61
J_1 DA - Izul UT_J
Attention!
Please consult factory for galvanizing plants and pickling lines as well as low voltage applications, indicating special envi­ronmental data.
To speed up quotations and order processing, we would appreciate receiving your drawings or sketches for systems with curves, dead sections, turntables, switches etc.
3. Control of voltage drop for the starting current
a) The placing of the feed-in point can be determined according to local conditions, mostly at the end of the installation (end feed-in point).
If not specified otherwise, 3% voltage drop in the conductors is within the limits established by the motor manufacturers.
The conductor size and/or number of feed points should be increased or even booster cables should be used in parallel in case the drop is exceeding the limitations.
J
Effectice length (/):
End feed: Mid feed:
l = L
H
■ l=L ■
I
[
H
L/2
[
Feed at both ends:
Two feeds (best position):
H
[- L/4 -H
L/4
4 6
[•— L/6 —A
f
[•— L/6
ll/ioh
[
i = -L-10
Three feeds (best position):
L/2
5
[-H
L/14 L 5
f
L/14
[ L14
— L
l = -L-14
Four feeds (best position):
b) Determining of the maximum starting current of the installation (IAA) if all individual outputs are known:
No of cranes
Of all cranes together (sequence acc. size of output)
Basic load of all
1. Motor
2. Motor
3. Motor
4. Motor
1
Ia
In
-
-
2
Ia
In
In
-
3
Ia
In
In
In
S Ig
3*
Ia
Ia
-
-
4
Ia
Ia
In
-
5
Ia
Ia
In
In
Table 6:
At frequent or long starting processes
After the sequence has been determined, the amperages are added together.
Iaa = S JA + S JN + S Iq
7
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pageCatalog pdf di En 2012-02-07-16