Patent ID: 6608742
Filing Date: 2003-08-19
Classification: H02H

Abstract:
A system for selecting voltage and current sources for a protective relay device for protection and control of electric power systems, comprising:a local source for obtaining input voltage and input current quantities from a power line suitable as inputs for a local protection application section in the protective relay device; a receiving member for receiving input voltage and current quantities suitable as inputs for said local protection application section from a remote protective relay device; at least one local protection application section in the protective relay device responsive to selected input voltage and input current quantities from the local source or the remote source for performing a protection algorithm thereon and providing output information indicating the result thereof; a transmitter for transmitting output information from the local protection application section to other protective relay devices; and a selection element for automatically selecting voltage and current input quantities from the local source or the remote source, in accordance with preselected power system criteria.