Common use of Substation technical requirements Clause in Contracts

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 and in the three windings, in addition to the corresponding cores for thermal image regulation and protection. The nominal voltage, voltage regulation, and 220/60/22.9 kV three-phase transformer connection group shall be as follows: ▪ Voltages - Primary voltage 220 kV - Secondary voltage 60 kV - Tertiary voltage 22.9 kV ▪ Rated power 50-65/50-65/15-19.5 MVA (ONAN-ONAF)(*) in 220/60/22.9 kV ▪ Connection Group YN / YN / delta - Primary side, 220 kV Wye, solidly grounded neutral - Secondary side, 60 kV Wye, solidly grounded neutral - Tertiary side, 22.9 kV Delta - Voltage regulation Automatic under load on the 220 KV side, with reference busbar voltage of 60 kV (**).

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 and phases, in the three windings, in addition to as well as the corresponding cores for thermal image regulation and protection. The nominal voltage, voltage regulation, and 220/60/22.9 138/22.9 kV three-phase transformer connection group shall be as follows: ▪ Voltages - Primary voltage 220 138 kV - Secondary voltage 60 22.9 kV - Tertiary voltage 22.9 10 kV ▪ Rated power 50-65/50-65/15-19.5 MVA (ONAN-ONAF)20 – 25 / 20 – 25 / (*) in 220/60/22.9 kV – (*) MVA (ONAN – ONAF) ▪ Connection Group YN / YN / delta YN/YN/Delta - Primary side, 220 138 kV Wye, solidly grounded neutral - Secondary side, 60 22.9 kV Wye, solidly grounded neutral - Tertiary side, 22.9 10 kV Delta - ▪ Voltage regulation Automatic under load on the 220 KV 138 kV side, with reference busbar voltage taps of 60 kV +/- 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 and phases, in the three windings, in addition to as well as the corresponding cores for thermal image regulation and protection. The nominal voltage, voltage regulation, and 220/60/22.9 138/22.9 kV three-phase transformer connection group shall be as follows: ▪ Voltages - Primary voltage 220 138 kV - Secondary voltage 60 22.9 kV - Tertiary voltage 22.9 10 kV ▪ Rated power 5020 – 25 / 20 – 25 / 6-65/50-65/15-19.5 7.5 MVA (ONAN-ONAN – ONAF)(*) in 220/60/22.9 kV ▪ Connection Group YN / YN / delta YN/YN/Delta - Primary side, 220 138 kV Wye, solidly grounded neutral - Secondary side, 60 22.9 kV Wye, solidly grounded neutral - Tertiary side, 22.9 10 kV Delta - ▪ Voltage regulation Automatic under load on the 220 KV 138 kV side, with reference busbar voltage taps of 60 kV +/- 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 and in the three windings, in addition to the corresponding cores for thermal image regulation and protection. The nominal voltage, voltage regulation, and 220/60/22.9 kV three-phase transformer connection group shall be as follows: ▪ Voltages - Primary voltage 220 kV - Secondary voltage 60 kV - Tertiary voltage 22.9 kV ▪ Rated power 50-65/50-65/15-19.5 MVA (ONAN-ONAF)(*) in 220/60/22.9 kV ▪ Connection Group YN / YN / delta - Primary side, 220 kV Wye, solidly grounded neutral - Secondary side, 60 kV Wye, solidly grounded neutral - Tertiary side, 22.9 kV Delta - Voltage regulation Automatic under load on the 220 KV side, with reference busbar voltage of 60 kV (**).