6.6kV HV Induction motor Protection
HV 6.6kV Induction motor Protection For HV motors rated 6.6kV and above motor over current, stalled rotor, and short circuit protections shall be provided by three 3-element relays mounted on…
DC Motor Applications in Industries
DC Motor Applications in Industries In spite of wide use of ac supply, dc machines have some advantages compared to ac motors and are used in industries for some applications. Some of the…
Why Damper windings used in synchronous motors
Synchronous motors are not self starting machines. These machines are made self starting by providing a special winding in the rotor poles, known as damper winding or squirrel cage windings.…
Applications of Synchronous Motors
For industrial squirrel cage induction motors are used mostly for the motor and drive systems applications. Synchronous motors are very rarely used below 40kW output because of the higher cost…
Advantages of Hydrogen cooling in Synchronous Generators
Cooling system should be provided in the generator or alternator to remove the heat generated in the windings (I2R loss) of the generator. Inability to remove the heat results in…
Advantages of Three Phase System Compared to Single Phase System
Three phase system is widely used in generation, transmission and distribution. Single phase system is only used to operate small electrical appliances at consumer ends where the power rating is…
Advantages & Disadvantages of Variable Speed Drives
Variable Speed Drives (VSDs) are employed in the industrial applications where different speeds are require to operate certain process systems. VSDs consists of rectifying unit for converting ac to dc,…
Difference between Current Transformer and Potential Transformer
Current Transformers (CT) and Potential Transformers (PT) are used to measure the current and voltage in a circuit of the order of hundreds of amperes and volts respectively. A CT…
Electrical Contactor, Switch, Circuit Breaker
An Electrical Contactor is a switch. In simple words contactor is a switch which closes its contacts with the help of relay. Most of the contactors operate by electromagnet, thus…
Insulating Material for Cable Requirements
The life and satisfactory operation of a cable depends to a great extent upon the characteristics of the insulation employed. So the proper choice of the insulating material for the…
