7 System Protection


A power system can be thought of as a chain, the links of which are the generators, the power transformers, the switchgear, the transmission lines, the distribution circuits, and the utilization apparatus. The failure of any link destroys the capacity of the chain to perform the function for which it was intended.

The continuity of the chain can be secured by providing alternate links. For example, the transmission lines, being exposed to the natural elements, are much more vulnerable to faults than the power transformers and switchgear. Therefore, alternate transmission lines may be economically justified, ...

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