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Cgit application guide Compressed Gas Insulated Transmission Bus Systems CGIT Westboro Inc Oak Street Westborough Massachusetts USA Tel - Fax - CGIT Westboro Inc ??Compressed Gas Insulated Transmission Bus Systems ? CCONTENTS INTRODUCTION CGIT DESIGN FOR

Compressed Gas Insulated Transmission Bus Systems CGIT Westboro Inc Oak Street Westborough Massachusetts USA Tel - Fax - CGIT Westboro Inc ??Compressed Gas Insulated Transmission Bus Systems ? CCONTENTS INTRODUCTION CGIT DESIGN FOR SF TRANSMISSION BUS SYSTEMS General Design Design Considerations Description of Components Bus Assemblies Tripost Support Insulator Conical Insulators Elbows Tees and Crosses Particle Traps Finger Contacts SF to Air Bushings Bus Supports APPLICATIONS OF SF CGIT BUS Introduction Power Plant Optimization PP Power Station Line Crossings Rowville Project Penuelas Project Underground Transmission Direct- Buried Trenched Long Vertical Shafts Balsam Meadows Hydro Electric Station Revelstoke Hydro Project Elevated Installations Teesside Power Plant Retro ?t of Existing Installations Consolidated Edison Dunwoodie Station Seabrook Nuclear Power Plant Substation Long-Term Extensions Claireville CONCLUSION CGIT Westboro Inc ??Compressed Gas Insulated Transmission Bus Systems ? CINTRODUCTION Company Background CGIT Compressed Gas Insulated Transmission Bus Systems have been in use worldwide since First developed by High Voltage Power Corporation in cooperation with the Massachusetts Institute of Technology purchased by the Westinghouse Electric Co in and purchased by ABB Power T D in In AZZ incorporated purchased the product line CGIT Westboro Inc remains the world leader in the supply of transmission bus for long distance gas insulated bus applications Product Background CGIT provides a compact reliable and economical alternative to conventional cable systems and overhead lines for power transmission The e ?ective electric and magnetic shielding a ?orded through the CGIT design allow for minimized right-of-way requirements as well as safer environmental conditions Standard CGIT systems are suitable for voltages between kV through kV with current ratings as high as Amperes The ?rst commercial CGIT system was installed in Since then more than miles km of CGIT have been delivered and installed worldwide Simple and inexpensive interfaces exist to almost all types of high-voltage equipment including GIS transformers oil paper cables and SF -air bushings The CGIT system has been utilized in many unconventional applications in addition to standard transmission paths The CGIT system can be installed in the following ways n At ground level n Elevated above ground on pillars or support structures n Below grade in an open or covered trench n Directly buried underground n Vertically in tunnels shafts or towers n Suspended from existing substation structures The CGIT system provides economic advantages for installation operation and maintenance A pre-designated number of sections each terminating in plug socket joints are pre-established prior to arrival to site Type HM contact assemblies provide the high current conductor connections that continue the low loss electrical paths of the system The lower losses within the CGIT circuits equate to lower operating costs Once installed maintenance of the system can be reduced to annual SF gas moisture and pressure checks and mechanical assembly checks i e bus exterior supports etc Since the CGIT system includes no active or switching components that may wear during use it is never intended that the system be opened for inspection or maintenance Further advantages of CGIT are CGIT Westboro Inc