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…
Surge Impedance Loading of Transmission Line
Loading of any transmission line depends on, Thermal limitation (I2R limitation) Voltage regulation Stability Limitation This is defined as the load (of unity power factor) that can be delivered by…
Parallel Operation of Alternators
Requirements of parallel operation of alternators: The alternators which are to be operated in parallel should meet the following requirements so as to make the operation successful. Requirements are: Two…
Induction Motors Faults and Protection
Faults that can occur in 3 phase induction motors and associated protections are discussed below: Stator faults: These faults include phase to phase faults, earth faults, and inter turn faults.…
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…
