Common use of Substation Technical Requirements Clause in Contracts

Substation Technical Requirements. The power transformer shall be supplied with current transformers incorporated into the bushing insulators, with three (3) 5P20 protection cores, for the three phases, in the three windings, as well as the corresponding cores for thermal image regulation and protection. The nominal voltage, voltage regulation, and 138/22.9 kV transformer connection group shall be as follows: ▪ Voltages - Primary voltage 138 kV - Secondary voltage 22.9 kV - Tertiary voltage 10 kV ▪ Rated power 20 – 25 / 20 – 25 / 6-7.5 MVA (ONAN – ONAF)(*) ▪ Connection Group YN/YN/Delta - Primary side, 138 kV Wye, solidly grounded neutral - Secondary side, 22.9 kV Wye, solidly grounded neutral - Tertiary side, 10 kV Delta ▪ Voltage regulation Automatic under load on the 138 kV side, with taps of +/- 10 x 1% (**)

Substation Technical Requirements. The three-phase power transformer shall be supplied with current transformers incorporated into the bushing insulators, with three (3) 5P20 protection cores, for the three phases, phases and in the three windings, as well as in addition to the corresponding cores for thermal image regulation and protection. The nominal voltage, voltage regulation, and 138/22.9 220/60/22.9 kV three-phase transformer connection group shall be as follows: ▪ Voltages - Primary voltage 138 220 kV - Secondary voltage 22.9 60 kV - Tertiary voltage 10 22.9 kV ▪ Rated power 20 – 25 / 20 – 25 / 650-7.5 65/50-65/15-19.5 MVA (ONAN – ONAN-ONAF)(*) in 220/60/22.9 kV ▪ Connection Group YN/YN/Delta YN / YN / delta - Primary side, 138 220 kV Wye, solidly grounded neutral - Secondary side, 22.9 60 kV Wye, solidly grounded neutral - Tertiary side, 10 22.9 kV Delta ▪ - Voltage regulation Automatic under load on the 138 kV 220 KV side, with taps reference busbar voltage of +/- 10 x 1% 60 kV (**).

Substation Technical Requirements. The power transformer shall be supplied with current transformers incorporated into the bushing insulators, with three (3) 5P20 protection cores, for the three phases, in the three windings, as well as the corresponding cores for thermal image regulation and protection. The nominal voltage, voltage regulation, and 138/22.9 kV transformer connection group shall be as follows: ▪ Voltages - Primary voltage 138 kV - Secondary voltage 22.9 kV - Tertiary voltage 10 kV ▪ Rated power 20 – 25 / 20 – 25 / 6-7.5 (*) – (*) MVA (ONAN – ONAF)(*) ▪ Connection Group YN/YN/Delta - Primary side, 138 kV Wye, solidly grounded neutral - Secondary side, 22.9 kV Wye, solidly grounded neutral - Tertiary side, 10 kV Delta ▪ Voltage regulation Automatic under load on the 138 kV side, with taps of +/- 10 x 1% (**)

Substation Technical Requirements. The three-phase power transformer shall be supplied with current transformers incorporated into the bushing insulators, with three (3) 5P20 protection cores, for the three phases, phases and in the three windings, as well as in addition to the corresponding cores for thermal image regulation and protection. The nominal voltage, voltage regulation, and 138/22.9 220/60/22.9 kV three-phase transformer connection group shall be as follows: ▪ Voltages - Primary voltage 138 220 kV - Secondary voltage 22.9 60 kV - Tertiary voltage 10 22.9 kV ▪ Rated power 20 – 25 / 20 – 25 / 650-7.5 65/50-65/15-19.5 MVA (ONAN – ONAN-ONAF)(*) in 220/60/22.9 kV ▪ Connection Group YN/YN/Delta YN / YN / delta - Primary side, 138 220 kV Wye, solidly grounded neutral - Secondary side, 22.9 60 kV Wye, solidly grounded neutral - Tertiary side, 10 22.9 kV Delta ▪ - Voltage regulation Automatic under load on the 138 kV 220 KV side, with taps reference busbar voltage of +/- 10 x 1% 60 kV (**).