400/200/110 kV Brazi Vest electrical substation equipped with outdoor enclosed cells

Short description:

400 / 220 / 110 kV Brazi Vest Substation is an important branch point of the transmission network gathering several functions for each voltage in turn, as follows:

At 400 kV:

power transit between the aea Bucharest and Brasov and a supply reserve of each above mentioned areas within a network having at its end 400 / 110 kV substations;
power injection in the network of 220 kV of the area, for supplying the local consumer and the consumers in the areas Teleajen and Buzau, as well as for reserving the connections in the areas Bucharest East and Targoviste. This function will become more important furher to the cancelling of the local source - the two large units (200 MW) of Brazi Vest CHPP.

At 220 kV:

power injection in the area network of 110 kV;
supplying the deficit areas Teleajan and Buzau;
interconnection with the areas Bucharest East and Targoviste.

At 110 kV:

supplying the local consumers;
reserving the supplying of deficit areas (Teleajen and Buzau).

Brazi Vest substation was commissioned in 1971, being equipped with equipment manufactured in Romania at the technological level of the sixties.
The technical condition of this equipment is inadequate, their normal operating lifetime is exceeded and it is necessary to modernize this substation by providing high performance equipment and systems based on state-of-the-art technologies.
400 / 220 / 110 kV Brazi Vest substation has been modernized by replacing the existing air-nsulated electrical equipment with high performance modern equipment i.e. 400 and 220 kV SF6-GIS type insulated enclosed cells.
These GIS equipment as well as the control-protection integrated system lead to the following advantages:

getting free significant land surfaces as the surface occupied by GIS cells is very small (e.g. for 400 kV the ratio is 1:40);
significant reduction of maintenance yearly expenses;
possibility of erecting new cells without taking out of operation the existing systems;
observance of labor protection norms and fire preventing norms by eliminating all risks of injuries, fires etc.
easy extension of substations with new cells for all voltages;
reduction of monitoring and maintenance personnel;
possibility of integral remote control of substation from all dispatcher levels (area, territory and national significant reduction of materials consumption (conductors, isolators, cables) considering the compact system performed by means of GIS;
ensurance of monitoring and maintenance personnel protection;
ensurance of environment and neighbourhood protection according to international standards;
the supply of industrial consumers under reliable conditions and at higher parameters is guaranteed.

Estimated economic efficiency:

Analysis time: 22 years (of which 2 years construction time);
Operating time: 20 years (about 170,000 hours);
Annual operating time: 8,400 hours/year;
Internal Rate of Return (IRR): 17%;
Return on Investment (ROI): 21.5%;
Total investment value: 45.0 mil USD;
Net Present Value (NPV): 53.8 mil USD;
Present return time: about 7.5 years.

Country and location:

Romania, Bucharest

Start date / commissioning date/ implementation stage :

September 2001 - 2005 - start of technological buildings construction works

Client:

C.N. Transelectrica S.A.

Associated companies:

Tecnoservice (Romania)
Itochu (Japan)
Energomontaj (Romania)
Energoconstructia (Romania)

ISPE