hager KEH31D00S3LMA, System Manual

Page: 56 / 92

Technical data
56 Technical changes reserved
6.5 Calculating the voltage drop
∆V = Actual current / Rated current x strand length x Factor V/m = Voltage loss
For energy distribution using tap-off units, the result must be divided by 2.
Aluminium conductors: Factor V/m according to power factors and rated
current
Rated current [A] cos
ϕ
= 0.9 cos
ϕ
= 0.8 cos
ϕ
= 0.7 cos
ϕ
= 0.6 cos
ϕ
= 0.5
800 0.099 0.094 0.087 0.080 0.073
1000 0.119 0.113 0.106 0.097 0.088
1250 0.116 0.112 0.106 0.099 0.092
1600 0.119 0.114 0.107 0.099 0.090
2000 0.116 0.111 0.105 0.097 0.088
2500 0.101 0.095 0.088 0.080 0.072
3200 0.107 0.102 0.095 0.088 0.080
4000 0.116 0.110 0.103 0.095 0.086
Copper conductors: Factor V/m according to power factors and rated
current
Rated current [A]
cos
ϕ
= 0.9 cos
ϕ
= 0.8 cos
ϕ
= 0.7 cos
ϕ
= 0.6 cos
ϕ
= 0.5
1000 0.103 0.099 0.092 0.085 0.078
1250 0.094 0.091 0.087 0.081 0.075
1600 0.088 0.087 0.084 0.080 0.075
2000 0.090 0.090 0.088 0.084 0.080
2500 0.089 0.088 0.085 0.081 0.077
3200 0.074 0.073 0.070 0.066 0.062
4000 0.087 0.086 0.083 0.079 0.074
Example:
Conductor: Copper
Actual current: 3200 A
Rated current: 4000 A
Strand length / system length: 30 m
V/m for power factor cos
ϕ
= 0.9 0.087 (Table)
Calculation of example:
∆V = 3200/4000 x 30 m x 0.087 V/m = 2.09 V
For energy transport
∆V = 2.09 V/2 = 1.05 V
For energy distribution