Instrument Transformers - Definition, Types and Errors: AC type protective relays are actuated by current and voltage supplied by current and potential (or voltage) transformers, known as instrument transformers. The…
Overlapping Zones of Protection: Overlapping Zones of Protection - In order to provide selectivity to the system it is usual practice to divide the entire system into several protection zones.…
Basic Requirements of Protection System: Protection system is an extremely important part of the power system as it is provided to operate under abnormal conditions to prevent failure or isolate…
Why we need for Power System Protection? Need for power system protection are growing fast with more generators, transformers and large network in the systems. For system operation a high…
Effects of Short Circuit Faults on Power System: Depending upon power circuit voltage and configuration, method of neutral connection, presence of regulating devices and the speed of disconnection of the…
What is Short Circuit Current? - Definition and its Process: Whenever a short circuit current occurs in a power network, it causes heavy current to flow in the network. Figure…
Starting of Squirrel Cage Induction Motor: Direct-on-Line Starting or Full-Voltage Starting - As already mentioned, squirrel-cage induction motors, as a general rule, up to 4 or 5 kW are started…
Counter Emf Automatic Starter - Working Principle and its Drawbacks: This type of starter depends upon the build up of the back or counter emf to operate the contactors (a…