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.

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