Siah Bisheh 400 kV GIS Switchyard and Hassan Keyf–Ziaran Line Connection

Technical Specifications

•    Three overhead line feeders
•    Four power plant transformer feeders
•    One bus coupler feeder
•    Double busbar arrangement, operable as main and transfer busbars using bypass disconnectors in case of feeder breaker failure
•    Provision for construction of a fourth line feeder

Moshanir responsibility:

Moshanir acted as consultant for:
•    Electrical and civil design
•    Equipment procurement
•    Supervision of installation, testing, and commissioning

Key Achievements

•    Construction of a gantry with strength equivalent to a terminal tower for the Hassan Keyf line, with a 245 m span
•    Installation of line-end equipment on a platform located on the same gantry, and installation of end equipment for other lines on the roof of the GIS hall and control building
•    Initial project plan only foresaw construction of a take-off yard for connecting 400 kV cable heads to gantries and linking them to four line circuits leading to a substation at another location. Following network studies, the GIS substation was instead constructed on the same site, eliminating the need for the take-off yard and the planned external lines.