BS in Electrical Engineering
Electrical Engineering Department
The objective of this project is to build a radial distribution system that operates on a lower voltage. The system consists of a transmission line protected by a SEL-351 Relay, a three- phase transformer protected by a SEL-587 Relay, and a three-phase induction motor protected by a Cooper Form 6 Controller. The SEL-351, SEL-587, and the Cooper Form 6 Controller are microprocessor-based relays that are used to provide protection under faulted conditions. When a fault is detected in the system, the closest upstream relay sends a trip signal to its assigned local breaker. The SEL-351 provides overcurrent protection for the transmission line and the Form 6 Controller provides overcurrent protection for the motor. The SEL-587 protects the transformer by using a current differential protection scheme. The testing involves faulting different locations on the system to analyze each protective relay with its designated protective zone. When the fault was applied to each zone, the responsible relay tripped based on its settings, which verified that the design worked. The benefits of this project are familiarization with protection schemes, the efficient operation of protective equipment and programming different microprocessor-based relays.