Transformer: Maximum Cable Length Calculation
What is the maximum cable length that can be run from the transformer secondary to the utility distribution system without exceeding a voltage drop of 2%?
We need to find out the maximum cable length that can be run from the transformer secondary to the utility distribution system without exceeding a voltage drop of 2%.
Answer:
The maximum cable length that can be run from the transformer secondary to the utility distribution system without exceeding a voltage drop of 2% is 12.6 km (approximately).
In order to calculate the maximum cable length, we can use the formula for voltage drop:
Vd = 2 × L × R × I / 1000
Where:
- Vd = Voltage drop
- L = Length of the cable
- R = Resistance of the cable per km
- I = Current
By substituting the given values into the formula and solving for L, we get:
L = Vd × 1000 / 2 × R × I = 2% × 1000 / 2 × 0.628 × 26 = 12.6 km (approximately)
Therefore, the maximum cable length that can be run from the transformer secondary to the utility distribution system without exceeding a voltage drop of 2% is 12.6 km.