. . .
3.7.1 ›

ELETRICITY

At the end of 2016, the RNT (National Transmission System) consisted of 8,863 km in lines and 66 transformer substations and 15 step down, switching and transition substations.

THE NATIONAL ELECTRICITY TRANSMISSION NETWORK
  31 DECEMBER '16 31 DECEMBER '15 CHANGE
LENGTH OF LINES IN SERVICE (km)

8.863

8.805

0,7%

400 kV

2.670

2.632

1,4%

220 kV

3.611

3.611

0,0%

150 kV

2.582

2.562

0,8%

TRANSFORMATION POWER IN SERVICE (MVA)

36.636

36.673

-0,1%

AUTOTRANSFORMATION (MVA)

13.890

14.040

-1,1%

400/220 kV

7.200

7.200

0,0%
400/150 kV

5.990

5.990

0,0%
220/150 kV

700

700

0,0%
150/130 kV

0

150

-100,0%

TRANSFORMATION (MVA)

22.746

22.633

0,5%

400/60 kV

3.910

3.910

0,0%

220/60 kV

12.448

12.209

1,9%

150/60 kV

5.928

6.054

-2,1%

150/130 kV

140

140 0,0% 
220/30 kV 320 320 0,0% 

The RNT ensures the flow of electrical power from power plants to the transformer sub-stations where connections exist directly to VHV consumers and at 60 kV between the national transmission system and the national distribution network.

LINE LENGTH AND TRANSFORMATION POWER

The RNT also connects to the European Transmission System through ten interconnection points (nine lines at 220 and 400 kV and one at 130 kV) with the Spanish Transmission Network. This interconnection is provided by three 220 kV lines at Douro International and by six 400 kV lines, two between Minho and Galicia, one at Douro International, one at Tejo International, one between the Alentejo and Extremadura and one between the Algarve and Andalusia. Furthermore, in exceptional cases for regional support for the distribution network, a 130 kV line is established between Minho and Galiza.

AVERAGE IMPORT AND EXPORT CAPACITY, Mw

1 928 Mw

IMPORTS

2016

2 391 Mw

EXPORTS

2016

 

 

The National Dispatch Centre in Sacavém (Loures) coordinates general operations and ensures balance in the national electricity system.

The network Operations Centre in Vermoim (Maia) is responsible for the monitoring and remote operation of all national transmission system equipment.

The safety telecommunications network, largely supported by very high voltage infrastructure ( bre-optic and hertzian beams) is used to provide data transmission services, both for real time monitoring and the transmission of control commands to network elements and the communications facilities required for operating the RNT.

NATIONAL ELECTRICITY TRANSMISSION NETWORK