Calculation

The following tables show extracts from typical technical data for conductor rails and power supply cables.

The following values are taken from the tables to calculate R_{line 1} and R_{line 2}:

1. Table 2: Cable cross section for line 1 to the sub-distributor = 120 mm²
2. Table 1: Cross section of the conductor rails (50 m length) for line 2 = 70 mm²
3. Table 2: Cross section of the cable (60 m length) for line 2 = 70 mm²

For the MDR91B-0750-.. supply and regenerative module, an overload of 250% results in a permissible total resistance R_perm = 105 mΩ.

R_transformer = 3 mΩ

R_{line 1} = 20 m × 0.153 mΩ/m = 3.06 mΩ

R_{line 2} conductor rail portion: R_{line 2_1} = 50 m × 0.298 mΩ/m = 14.9 mΩ

R_{line 2} cable portion: R_{line 2_2} = 60 m × 0.268 mΩ/m = 16.08 mΩ

R_total = R_transformer + R_{line 1} + R_{line 2_1} + R_{line 2_2}

R_total = 3 mΩ + 3.06 mΩ + 14.9 mΩ + 16.08 mΩ = 37.04 mΩ

Condition: R_total ≤ R_permissible

37.04 mΩ < 105 mΩ → condition fulfilled

The total resistance of the transformer, supply lines, and conductor rails is less than the maximum permissible total resistance up to the input terminals of the line choke.