Definition of Switchgear
A switchgear or electrical switchgear is a generic term which includes all the switching devices associated with mainly power system protection. It also includes all devices associated with control, metering and regulating of electrical power system. Assembly of such devices in a logical manner forms switchgear. In other words apparatus used for switching, controlling and protecting the electrical circuits and equipment is known as switchgear. This is very basic definition of switchgear
Electric switchgear is necessary at every switching point in the electrical power system. There are various voltage levels and hence various fault levels between the generating stations and load centers. Therefore various types of switchgear assembly are required depending upon different voltage levels of the system. Besides the power system network, electrical switchgear is also required in industrial works, industrial projects, domestic and commercial buildings
Definition of Feeder
In power distribution, a set of electric conductors that originate at a primary distribution center and supply power to one or more secondary distribution centers, branch-circuit distribution centers, or a combination of these. See also feeder.