ELECTRICAL APPARATUS COMPRISING PROTECTIVE RELAYS

Brand	Owner	Address	Description
BECKWITH ELECTRIC D CO. INC.	HUBBELL POWER SYSTEMS, INC.	40 Waterview Drive Shelton CT 06484	ELECTRICAL APPARATUS COMPRISING PROTECTIVE RELAYS, SYNCHRONIZER CHECK RELAYS, MOTOR PROTECTION RELAYS, AUTOMATIC SYNCHRONIZERS, TAP CHANGING TRANSFORMER CONTROLS, MOTOR BUS TRANSFER CONTROLS, PHASE ANGLE TELEMETERING INSTRUMENTS, SUPPRESSORS, TRANSDUCERS, AND ELECTRICAL TESTING INSTRUMENTS;ELECTRIC AND CO. INC.;
	Where the owner name is not linked, that owner no longer owns the brand

Technical Examples

A system for checking synchronization of AC voltage sources before closing a power circuit breaker is provided comprising two power circuit breakers connected by a power transmission line, such as by using remote voltage via fiber channel. Each circuit breaker is respectively connected to a bus and a protective relay. The circuit also comprises voltage transformers between the bus and the protective relay. The protective relays monitor the voltages on the bus side of the circuit breakers and current flowing through the circuit breakers in order to detect short circuits on the line. A bidirectional communications link is further provided for connecting protective relays together.