Switchgear

Switchgear:

Bus Bar Arrangement in Power Station : When a number of generators or feeders operating at the same voltage have to be directly connected electrically, bus-bars are used as the common electrical component. Bus-bars are copper rods or thin walled tubes and operate at constant voltage. We shall discuss some important Bus Bar Arrangement in Power Station and sub-stations. All the diagrams refer to 3-phase arrangement but are shown in single-phase for simplicity. 1. Single Bus-bar System: The single bus-bar system has the simplest design and is used for power stations. It is also used in small outdoor stations having relatively few outgoing …


Short Circuit in Power System : Whenever a fault occurs on a network such that a large current flows in one or more phases, a Short Circuit in Power System is said to have occurred. When a short circuit occurs, a heavy current called short circuit current flows through the circuit. This can be beautifully illustrated by referring to Fig. 16.6 where a single phase generator of voltage V and internal impedance Zi is supplying to a load Z. Under normal conditions, the current in the circuit is limited by load impedance Z. However, if the load terminals get shorted due to any …


Switchgear Definition : Switchgear Definition status that, The apparatus used for switching, controlling and protecting the electrical circuits and equipment is known as switchgear. The switchgear equipment is essentially concerned with switching and interrupting currents either under normal or abnormal operating conditions. The tumbler switch with ordinary fuse is the simplest form of Switchgear Definition and is used to control and protect lights and other equipment in homes, offices etc. For circuits of higher rating, a high-rupturing capacity (H.R.C.) fuse in conjuction with a switch may serve the purpose of controlling and protecting the circuit. However, such a switchgear cannot be used profitably on …


Switchgear Equipments : Switchgear covers a wide range of equipment concerned with switching and interrupting currents under both normal and abnormal conditions. It includes switches; fuses, circuit breakers, relays and other equipment. Let us discuss Switchgear Equipments briefly here. 1.Switches: A switch is a device which is used to open or close an electrical circuit in a convenient way. It can be used under full-load or no-load conditions but it cannot interrupt the fault currents. When the contacts of a switch are opened, an are is produced in the air between the contacts. This is particularly true for circuits of high voltage and …


Updated: May 1, 2020 — 10:55 pm