Switchgear |Ratings & Standards| Functions

 Switchgear:

    The term Switchgear, used in association with the electric power system, or grid, refers to the combination of electrical disconnects, fuses, and/or circuit breakers used to isolate electrical equipment. Switchgear is used to de-energize equipment to allow work to be done and to clear faults downstream.

Ratings & Standards:

    Ratings, design, specifications, and details of switchgear are set by a multitude of standards. In North America mostly IEEE and ANSI standards are used, much of the rest of the World uses IEC standards, sometimes with local national derivatives or variations.

For Example;

Functions:

    Functions one of the basic functions of switchgear is protection, which is the interruption of short-circuiting and overload fault currents while maintaining service to unaffected circuits. Switchgear also provides isolation of circuits from power supplies. Switchgear is also used to enhance system availability by allowing more than one source to feed a load.

    Following are the are typical specifications, required for manufacturing / Testing/ Installation of the Switchgear:

1)    H.V Switchgear 

2)    L.V Switchgear

3)    Current Transformer

4)    Inductive Voltage Transformer

5)    Low Voltage Switchgear & Control gear

In the next lecture, we will discuss each in detail.

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