3. For the shown 11kV three phase system - Select appropriate current transformers at buses A and B
- Set the downstream relay RBC as main protection for faults at remote end “c” and find its trip times using CO-8 TDOC chart.
- Set the upstream relay RAB as backup protection and find its trip times using CO-8 TDOC chart

Atank with constant volume contains 2.27 kg of a mixture of water phases (liquid-vapor). in the initial state the temperature and the quality are 127 °c and 0.6, respectively. the mixture is heated until the temperature of 160 oc is reached. illustrate the process in a t-v diagram. then, determine (1) the mass of the vapor in kg at the initial state, (2) the final pressure in kpa.