Why do 3 phase induction motors not need a neutral?
3 Phase induction motor is a balanced three-phase load. Therefore, the induction motor draws a balanced current if the supply voltage and the impedance of … Read more
Machines
An electrical machine converts mechanical energy into electrical energy or vice versa. The transformer is also an electrical machine which transform the voltage without changing the frequency. We will discuss about the;
- DC Motor
- DC generator
- Induction Motor
- Transformer
- Electrical drives
- Alternator or synchronous generator
Shaft Grounding Devices | Shaft Earthing Devices
Shaft grounding devices minimize the shaft voltage and prevent bearings damage caused by the circulating current. There are numerous reasons for developing shaft voltage in … Read more
What is the Difference between Soft Starter and VFD?
The main difference between VFD and Soft Starter is that a VFD can increase or decrease the speed of the motor, while a soft starter only controls the smooth start and stop … Read more
Why is the core of a power transformer grounded?
Transformer is a static piece of equipment and it has primary and secondary winding. The low voltage winding has few turns of wire wound around … Read more
Why PS Class Current Transformer is used for Differential Protection?
What is Differential Protection? Differential protection is used for detecting the fault in a particular zone. Therefore, we call it also unit or zone protection. … Read more
What is the disadvantage of large exciting current in a transformer?
What is Exciting current? The exciting current in the transformer produces the magnetic flux in the core. When energizing transformer at no load, transformer draws … Read more
Difference between no load, exciting, and leakage current in transformer
The no-load current of a transformer is the vector sum of the exciting current and core loss current of the transformer. Why Losses in a … Read more
Why can’t an Induction Motor run at synchronous speed?
The induction motor can’t run at synchronous speed because it is not possible to run the motor without load. Even the motor is at no … Read more
What is the slip value of a 3-phase induction motor at synchronous speed and starting speed?
When the stator of the induction motor is fed three phase supply, the synchronous rotating field is generated. The flux generated in the stator gets … Read more
Change of Resistance in Wires by Stretching
We shall understand with an example how the resistance of a wire changes with stretching its length. Example-1 –Change of Electrical Resistance with wire stretching … Read more