Subject: Power System Analysis

Topic: Power System Transients

Difficulty: High

A voltage having a crest value of 3000 KV is traveling on the line of 750 KV. The protective level is 1700 kV and the surge impedance of the line is 300 ohm. Calculate 1)line current before reaching the arrester 2)current through arrester 3)value of arrester resistance for this condition 4)reflected voltage 5)Verify the reflection and refraction coefficient

Reflection and Refraction Coefficient Problem

The given data -

Voltage = $ V^{'} $ = 3000 kV

Protective Level = $ V_a $ = 1700 kV

Surge Impedance of Line = $ Z_c $ = 300 Ω

To find -

i] Line current before reaching the Arrester = $ I^{'} …