Design Specific Examples. Con Xxxxxx’s Central Engineering specification CE-ES-2002 provides the following checklist for Transmission Substation Design: ▪ Primary and secondary voltage to be used ▪ System studies ▪ Substation capacity, current and future ▪ Future expansion needs ▪ BIL rating of equipment ▪ Number of transmission feeder positions, initial and final ▪ Size and layout of station property ▪ Air insulated versus SF6 bus (Momentary rating of bus) ▪ Maintenance requirements including equipment testing ▪ Electrical clearances ▪ Light and power requirements including Standby Diesel Generator and Mobile Generator Quick Connect requirements ▪ Grounding design ▪ Control room layout ▪ 125 VDC system requirements ▪ Cable and trench layout ▪ Metering scheme ▪ Roadway layout ▪ Primary and secondary voltage relaying schemes ▪ Aesthetic appearance of station ▪ Type of primary transmission cables ▪ One-line high tension drawing ▪ Accuracies of current transformers ▪ Lighting design ▪ Security protection ▪ Type of structure ▪ Number and location of shunt/series reactors ▪ Environmental aspects, Oil Water Separator sizing and location ▪ Type of circuit switchers and interrupters (Interrupting rating) ▪ Type of metal clad switchgear Transformer MVA rating and % impedance ▪ Circuit breaker ratings (Continuous and short circuit) ▪ Phase angle regulators ▪ Bus configuration (Ring or breaker and half ▪ Automation / SCADA / HMI, Alarms requirements ▪ Communications / IR requirements ▪ Spare parts inventory assessment ▪ Lightning / Surge protection ▪ Corporate Security, Cyber Security While the NYISO’s Large Facility Interconnection procedures do not specifically address these, Con Edison requires all tasks above to be completed before the substation configuration can be accepted as final.
