University of Minnesota 

The Fitch Avenue Chilled Water Plant is a 17,000-square-foot building that contains a new electrical switch station, which replaced the existing station by installing arc-resistant switchgear in a new building. Switchgear was replaced that was beyond its useful service life that provides increased redundancy for the electrical distribution system. The switchgear also feeds new chilled water equipment that is installed in the upper level of the facility, which was needed to bolster the existing system. Sebesta Blomberg planned and designed the new switching station, including the structure, equipment specifications, calculations, and significant modifications to the underground electric distribution system to integrate the new facility to the existing building. 

Portland General Electric 

Gresham Substation required a complete design of the control and protection relaying and monitoring for the 115kV protection. The necessity for the project was due to dated electromechanical relays that needed replacement. Relaying for two transformer breakers, five line breakers and one tie breaker required eight new relay panels including a new 115kV Bus Differential panel.  The relays chosen for this project were SEL-421’s for the Tie and Line breaker controls, SEL-487B’s for the Bus differential relaying and SEL-486E’s for the Transformer differential relaying.  The tie breaker at this substation was unique and could be used to substitute any 115kV breaker with their relay transfer scheme using old RTS’s at each breaker panel for substituting the relaying and control of each 115kV breakers.  This project removed the old relay transfer scheme which used electromechanical relays and replaced it by using new RTS’s at each panel as an input to each relay to determine when each relay was transferred to protect the tie breaker relay.