Protection Engineering Basics and Schemes Protection Engineering | Page 205

6.3.3 Case 1: We have mention below data of one scheme

1 st we need to select CTs for protection scheme, For all this we need to use some formulae to find

MVA short circuit = MVA SC = MVA % Z

I full load HT = I FLH = MVA ∗

1000 1.732 ∗ V HT 1000

I full load LT = I FLL = MVA ∗ 1.732 ∗ V LT pg. 205