Example 2: Determine the Per Unit Impedances by taking 150 MVA and 11 KV in generator side as base values for the given power system. Zactual 一發 j180 Ohms G M) Yn 120 MVA 10.6 KV 0 25 pu 115 MVA 18 KV 0.25 pu 前A 100 MVA 135 MVA 11/250 KV 0.35 pu 220/18 KV 0.65 pu

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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.