Harmonics effect on Induction Motor
Harmonics in the power system are generated due to the usage of non linear load. Some of the effects of harmonics on the performance of induction machine are: Core losses in…
Classification of Transmission Lines
Over head transmission lines are classified based on the manner in which the capacitance is considered: Short Transmission Lines: Transmission lines whose length less than 80kms and operating voltage less…
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…
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…
Transformers Questions & Answers Part-4
Where Star (wye) Delta transformer is used in Power system Star-Delta Transformer (Y-Δ ) Primary Y (High Voltage side) and Secondary ( Low Voltage side) Δ is generally used at…
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…
Why Starting Current of Induction Motor is High
Starting Current in Induction Motor: Starting current of induction motor is as high as 5 to 7 times the normal full load current. Therefore different starting of induction motor, methods…
Auto Recloser Circuit Breaker in Power System
Most of the faults on over head lines are transient in nature. About 85% to 90% of faults are momentary and caused by tree branches, lightning, birds etc. These conditions…
Current Limiting Reactors and Short Circuit Currents
A current limiting reactors is also called as series reactors. It is an inductive coil having large inductive reactance compared to the resistance and is used to limit the short…
