A 3-phase 12.5kV circuit one mile long has 2/0 ACSR conductors. Line current is 30 amps, balanced. Calculate the total kVA load on the circuit and determine what the heat losses are in the circuit conductors. Size American Wire Gauge Cross-Section Circular Mils Per 1000 Feet Resistance 2 Weight (Pds) Copper ACSR Copper ACSR #6 26,250 41,740 66,370 105,500 0.3951 0.2485 0.675 79.5 36.4 # 4 #2 0.325 0.268 126.4 200.9 57.9 92.1 0.1563 1/0 0.09827 0.07793 0.063 0.168 0.133 319.5 402.8 146.4 20 184.5 133,100 167,800 211,600 0.102 0.084 3/0 507.9 232.1 4/0 0.04901 640.5 293.4

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KVL and KCL

KVL stands for Kirchhoff voltage law. KVL states that the total voltage drops around the loop in any closed electric circuit is equal to the sum of total voltage drop in the same closed loop.

Sign Convention

Science and technology incorporate some ideas and techniques of their own to understand a system skilfully and easily. These techniques are called conventions. For example: Sign conventions of mirrors are used to understand the phenomenon of reflection and refraction in an easier way.