CABLES AND WIRES - Novkabel

Inductance and inductance resistanceThe inductance of cables depends on their layout. For the typical laying methods anddistances, the average inductance value can be calculated according to the following formula:L – inductance (mH/km)S – distance between the conductor centers (mm)D – conductor diameter (mm).Inductance resistance (reactance) is calculated acc. to the following formula:X L – inductance resistance (Ω/km)F – inductance frequency (Hz).CapacityThe capacity of cables depends on their geometric size and can be calculated in the followingmanner:C – capacity (µF/km)D – diameter over insulation (mm)D – diameter over conductor with low-conductivity layer (mm)ε r – relative dielectric constant.234Capacitive currentCapacitive current, charging current, is determined acc. to:I C – capacitive current of a cable (A/km/phase)U 0 – phase voltage (kV)ω – circular frequency (1/s)C – capacity (µF/km).Cable impedanceCable impedance can be calculated acc. to the following formula:Z – impedance (Ω/km)R – conductor resistance (Ω/km)ω – circular frequency (1/s)L – cable inductance (mH/km).