Common use of Xxxxxx and Plattsburgh Substation System Upgrade Facilities Clause in Contracts

Xxxxxx and Plattsburgh Substation System Upgrade Facilities. The Xxxxxx Substation and Plattsburgh Substation SUFs will be constructed as described in this Section II.B. and with respect to the Xxxxxx Substation, as shown on drawings 070506-EE-1 and 070506-PL-1 attached to this Appendix A as Figures 3 and 4, respectively. P rotection System Changes at Transmission Owner’s Xxxxxx Substation for the MWP-2 Line The existing MWP-2 line primary protection is a permissive overreaching transfer trip (POTT) system with unblock logic, using a numerical relay in conjunction with audio tone equipment over single side band power line carrier channels. The existing MWP-2 line secondary protection utilizes electromechanical relays to provide backup distance protection. The primary and secondary protection will not essentially change, however the existing breaker failure protection at Xxxxxx will be modified to trip the Xxxx Substation line breakers remotely. To accomplish this scheme two Direct Transfer Trips (DTTs) will be required. The first DTT- 1/MWP-2 equipment required at Xxxxxx will include: - One FSK PLC Transmitter - One phase C wave Trap - One Phase C Coupling Capacitor Voltage Transformer (CCVT) - One phase C Line Tuner The second DTT-2/MWP-2 equipment will utilize audiotone equipment over the Xxxx/Xxxxxx microwave communication link described in the Microwave System description.

Xxxxxx and Plattsburgh Substation System Upgrade Facilities. The Xxxxxx Substation and Plattsburgh Substation SUFs will be constructed as described in this Section II.B. and with respect to the Xxxxxx Substation, as shown on drawings 070506-EE-1 and 070506-PL-1 attached to this Appendix A as Figures 3 and 4, respectively. P rotection System Changes at Transmission Owner’s Xxxxxx Substation for the MWP-2 Line The existing MWP-2 line primary protection is a permissive overreaching transfer trip (POTT) system with unblock logic, using a numerical relay in conjunction with audio tone equipment over single side band power line carrier channels. The existing MWP-2 line secondary protection utilizes electromechanical relays to provide backup distance protection. The primary and secondary protection will not essentially change, however the existing breaker failure protection at Xxxxxx will be modified to trip the Xxxx Substation line breakers remotely. To accomplish this scheme two Direct Transfer Trips (DTTs) will be required. The first DTT- 1/MWP-2 equipment required at Xxxxxx will include: - One FSK PLC Transmitter - One phase C wave Trap - One Phase C Coupling Capacitor Voltage Transformer (CCVT) - One phase C Line Tuner The second DTT-2/MWP-2 equipment will utilize audiotone equipment over the Xxxx/Xxxxxx microwave communication link described in the Microwave System description.