The switchgear may be used to clear faults downstream as well as de-energize equipment so that work can be done. This equipment has direct linkage reliability of the supply of electricity.
Components of Switchgear
Switchgear comprises protecting and switching devices that include fuses, switches, circuit breakers, isolators, control panels, relays, current transformers, potential transformers, control panels, and other associated equipment.
Some of the HV/LV Switchgear equipment is designed to operate under abnormal and normal conditions. Some of the equipment is also designed only to serve the role of switching; hence cannot sense faults. Switchgear facilitates switching generators, distributors, transmission lines as well as other electrical equipment on or off.
In the event of failure on any part of the system such as a short circuit, heavy current flows through the equipment, thus posing a potential threat to the equipment as well as causing interruption of service. When this happens, the switchgear will detect the existing fault before disconnecting the unhealthy section from the rest of the system.
Evolution of the Switchgear
The switchgear is mainly used to interrupt and switch currents under abnormal or normal operating conditions. The simplest form of switchgear that you can find is the tumbler switch that is not only used in controlling and protecting lights but other equipment in the office or at home as well. In the case of circuits that have a higher rating, a high rupturing capacity (H.R.C.) fuse and a switch may be used to protect and control the circuit. Even then, switchgear may not be profitable in high voltage systems of up to 33kV because of two reasons:
• The fuse cannot interrupt large fault currents resulting from faults within the system successfully.
• If the fuse blows, replacement may take a longer time resulting in interruption of service to consumers.
• In advanced power systems, the equipment and lines carry high current and operate at high voltage; thus, the occurrence of a short circuit can lead to massive damage. As such, the heavy currents are interrupted by heavy fault currents.
About the Company:- Robert Cowlishaw and Associates was established in the year 2007 and is a specialist Electrical Engineering company situated in Stockport near Manchester in the UK. We provide Electrical Survey and Condition reports including financial reports on various types of buildings, mainly commercial and industrial buildings.