Power system protection

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Power system protection is a branch of electrical power engineering that deals with the protection of electrical power systems from faults^{[citation needed]} through the disconnection of faulted parts from the rest of the electrical network. The objective of a protection scheme is to keep the power system stable by isolating only the components that are under fault, whilst leaving as much of the network as possible in operation. The devices that are used to protect the power systems from faults are called protection devices.