How Does the Protection System Function?

•The first line of defense is the protection of power system elements. The function of this type of protection is to detect faults and abnormal conditions and to disconnect the faulted element in order to prevent further damage in the element or a system disturbance. Modern power systems operate near the security limits.

•The system also needs protection functions at the system level that can include low frequency or low voltage load shedding among  others.

•Protection operation disconnects system elements. It is then important to provide automatic restoration functions. Among these functions, we might mention automatic re closing of transmission lines, automatic transfer to alternate power supplies, and automatic synchronization.

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