What happen When Synchronous Generator loss Excitation
During normal operation of the Synchronous Generator or Alternator excitation to the rotor is provided by the small DC generator running on the same shaft along with main generator. When…
Why rating of Synchronous Generators and Alternators in MVA or KVA
Normally the rating of synchronous generators or alternators will be in KVA or MVA instead of kW rating. Electrical apparatus or machines are usually rated the load which it can…
Pirani Gauge Working Principle
Pirani gauge – A Thermal conductivity Gauge The Pirani Gauge is a type of Thermal Conductivity Gauges. Basic principle of Pirani gauge A conducting wire gets heated when electric current…
Comparison of HVDC transmission and HVAC transmission
DC transmission has some advantages over AC transmission, but it cannot completely replace ac transmission system due to some limitations High Cost: The converters required at both the ends of…
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…
