Diagram
SK00001GB.fm
19
6.
Diagram
Selection of required cross section for extension of cables and power lines
This procedure takes into consideration:
1.
The ohmic and inductive resistance of the line with an admissible loss of voltage of 5% and cos phi = 0,8
as per voltage-frequency-curves.
2.
The admissible warming-up of the lines as per VDE standard (table of required minimum cross section).
ATTENTION!
The larger one of both cross sections has to be chosen.
Example:
Nominal voltage 3 ~ 400 V, 200 Hz
Rated current 15 A
Line length 100 m
15 A x 50 m = 1900 A x m
Cross section as per diagramm: 2,5 mm
2
Cross section as per table: 15 A : 1mm
2
Chosen cross section: 2,5 mm
2
Voltage - Frequency - Curves
Cross-section area of cable in mm
2
Minimum cross-section
area according to VDE
Max.
Max.
Cable
load
fuse
mm
2
A
A
1
15
10
1,5
18
10/3~16/1~
2,5
26
20
4
34
25
6
44
35
10
61
50
16
82
63
Rated current x length of cable A x m
25
108
80
Содержание AR 75/3/200/400
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