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Insulated conductor system U20, U30, U40 - 19699 SELECTION OF CONDUCTORS

c) Determining the whole equivalent continuous current of the installation ( I
DA ) After determination of the sequence of motors with the strongest output ( I
D ), the amperages marked with an “X” plus basic loads forlighting and heating are added together (see table 3).Table 3: I
DA = ∑ I
D + ∑ I
G NoofCranesHighestOutputmotor
nd rd th strongestmotor strongestmotor strongestmotor of all I
D *2 I
D *3 I
D *4 I
D *Basic load cranes ∑ I
G 1XX--X2XXX-X3XXX-X4XXXXX 5XXXXXXXXXX
Joint worktwo Cranes * With double drives corresponding to 2 · I D ;lifting magnet and hoisting unit are counted as onejoint drive. d) Determining rated current ( I
NK ) if only the total output (overall capacity) of a crane is given. For three-phase drive:For direct current drive:Approximately: I P
K [kW]
· 1000 P
K [kW]
· 1000U[V]
NK = I
= √ 3
NK · U[V]
· cos
N · · cos
N = 0,85 = 0,85 (efficiency) e) Reduction factor( ƒ
R ) for frequency operation of one crane and simultaneity factor ( ƒ
G ) for several cranes on one conductorline. ƒR ƒG ƒG ƒG 1 crane 2 cranes 3 cranes 4 cranes and more High frequency operation(bridgecranes for bulk material, production cranes)Normal operation (container cranes, harbour cranes, overhead travelling cranes)Small operation(storage cranes)0.90.7 0.50.90.80.70.80.650.50.70.50.4 I
DA = I
NK · ƒ
R (with one crane)
DA = I
NK · ƒ
R · ƒ
G (with several cranes)

2.Selection of conductors

a) According to the calculated equivalent continuous current of the installation( I
DA <_ I
zul. (Table) I
zul. = max. continuous ampacityI
I DA ) the appropriate conductor rail is selected from Table 4 Table 4: Engineering data Conductor railType Leakagedistance of shroudmmMax.voltageVcontinuousampere capacityAat 35°CResistanceOhm/1000 mImpedanceOhm/1000 mat 50 HzConductorcross section mm
2 CopperAlSteel U 20/50 CE 3018451000600.5870.612 U 20/50 AC 18304510001200.4830.600 U 20/50 C 504510002100.3760.416 U 20/50 CH 504510002100.3760.416 U 30/120 CE 1001810010003300.1780.222 U 30/75 C 7510010002800.2380.280 U 30/100 C 10010510003300.1780.264 U 30/130 CH 1309510004000.1370.221 U 30/150 C 1509510004400.1260.219 U 30/200 C 2009010005300.0900.195 U 30/200 CH 2009010005300.0900.195 U 40/200 C 20013010006000.0890.170 U 40/300 C 30013510007000.0630.178 U 40/300 CH 30013010007000.0630.178 U 40/400 C 40013010008600.0470.168 U 40/400 CH 40013010008600.0470.168 U 40/500 C 500125100010000.0380.161 U 40/500 CH 500120100010000.0380.161 U 40/500 CHH 500120100010000.0380.161

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