ComEd Protective Relaying and Communication Upgrades for 345kV Lines at TSS178 Blue Mound Project , Chicago, IL

Electrical Design Support

The overall scope of this project was the installation of a new 345kV System 1 relay panel and a new 345kV System 2 relay panel. System 1 was a Phase Comparison relay package (REL352 and backup SEL-321). The System 1 communication interface utilized Power Line Carrier on a single phase with a Pulsar TCF-10B Transceiver used for Phase Comparison and a second Pulsar TCF-10B used for Direct Transfer Trip. System Electrical Design Support

2 was a Directional Comparison Unblocking relay package (SEL-321). The System 2 communication interface utilized Power Line Carrier on another single phase with a Pulsar TCF-10B Transceiver used for Directional Comparison and a second Pulsar TCF-10B used for Direct Transfer Trip. The upgrades incorporated the new Digital Microwave Ring.

Facet engineering personnel provided electrical design services in support of this ComEd / Exelon’s Project. The scope included (2) 345kV line relay upgrades. The upgrade consisted of the replacement/installation of (4) relay panels. The schemes will employ Line Current Differential, Directional Under Reaching Transfer Trip, and Directional Comparison Blocking. New and revised schematic and wiring drawings for the (4) relay panels and the associated equipment drawings (i.e. 345kV breakers, disconnect switches, related relay panels) were provided including panel elevations (with BOM) and schematic diagrams.

Project Details

KEY PERSONNEL

John Mirabella*

AGENCY/OWNER

Commonwealth Edison (ComEd)

SERVICES

Electrical Design Support

*The listed personnel had a key role in completing this project prior to joining Facet team.