Three Phase Auto Recloser vs Single Phase Auto Reclose: Three Phase Auto Recloser is one in which the three phases of the transmission line are opened after fault incidence, independent…
Auto Reclosing Scheme: Auto Reclosing Scheme - It is well realized that the transient faults which are most frequent in occurrence do no permanent damage to the system as they…
Scheme of Distance Protection: In developing an overall Scheme of Distance Protection, it is necessary to provide a number of relays to obtain the required discrimination. Modern practice is to…
Instantaneous Overcurrent Relays: If the relay operates instantly without any intentional time delay, this characteristic can generally be satisfied by a relay of the non-polarized attracted armature type. This relay…
Important Questions of Sub Stations: 1. What is a sub-station ? Name the factors that should be taken care of while designing and erecting a substation. 2. Discuss the different…
Important Questions of Overvoltage Protection: 1. What is a voltage surge ? Draw a typical lightning voltage surge. 2. Discuss the causes of overvoltages. 3. What is lightning ? Describe…
Important Questions of Unsymmetrical Fault: 1. What is a 3-Φ unsymmetrical fault ? Discuss the different types of unsymmetrical faults that can occur on a 3-Φ system. 2. Discuss the…
Important Questions of Symmetrical Fault: 1. What do you understand by a short-circuit ? Discuss the possible causes of short-circuit in the power 2. Explain the harmful effects of short-circuit…