Transformers Questions & Answers Part-1
Inrush Currents in Transformers – Causes When a transformer is energized after a short interruption, the transformer may draw high inrush currents from the system due to core magnetization being...
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Transformers Questions & Answers Part-2
Auto-transformer Advantages: Auto-transformers in comparison with the double winding transformers are generally advantageous of the voltage ratio is favorable from the point of view of the equivalent size The reduction...
Transformers Questions & Answers Part-3
Insulation Materials used in Transformers and Induction Motors Insulation materials used in transformers and motors are classified based on the temperature withstand capability. Some of the insulation classes used in...
Power System Protection and Relays Questions & Answers
What is protective relay? It is an electrical device designed to initiate the isolation of a part of the electrical installation, or to operate an alarm signal, in the event...
Generator Protection Interview Questions & Answers
Synchronous Generator Protection Interview Questions Answers What are the common types of generator faults? The common types of faults occurring in synchronous generators are: Stator winding faults (phase to phase...
Transmission Lines Protection Questions Answers
Transmission Lines Protection Questions Answers What is meant by Tine Graded Protection? Time Graded protection is a scheme of over current protection, in which the discrimination is incorporated i.e, the time...
High Voltage and Power System Stability Interview Questions
High Voltage (HV) Interview Questions Answers Why Earth Wire is provided in the overhead transmisssion lines? Earth wire is provided above the overhead transmission lines for protection against lightning strokes....
Electrical Drives Questions & Answers
What is meant by V/F control? When the frequency is reduced, the input voltage must be reduced proportionally so as to maintain constant flux. Otherwise the core will get saturated resulting...
Interview Questions on Transformers
What is a transformer? Transformer is a static electrical device which transfers power from one circuit to another circuit without any physical contact. The main aim of this transformer is...
Top 100 Switchgear and Protection Interview Questions
What are the functions of protective relays To detect the fault and initiate the operation of the circuit breaker to isolate the defective element from the rest of the system,...