Technical information:

Reconstruction and upgrade of the existing 220/110kV Kraljevo 3 Substation to the 400/220 kV Kraljevo 3 Substation, Ratina, Kraljevo, includes the construction of a new 400 kV facility at the Kraljevo 3 Substation and installation of the 400/220 kV energy transformer.

Construction works on the reconstruction and upgrade of the Kraljevo 3 Substation include the construction of new portals and device carriers within the 400 kV Switchgear facility, then construction of the new device carriers with foundations within the 220 kV Switchgear facility, foundation works and construction of the transformer tank for two transformers with oil drainage, oil pit and a pump station.

Three new relay enclosures have been built within the 400 kV Switchgear and one within the 200 kV Switchgear, a control building has been adapted, new roads have been built in the 400 kV Switchgear and in a section of the 200 kV Switchgear, a new cableway has been built as well as the cable ducting within the 400kV Switchgear.

Social and economic interest:

By means of reconstruction and upgrade of the existing 220/110kV Kraljevo 3 Substation to the 400/220 kV Kraljevo 3 Substation a stable functioning of the Bajina Bašta Reversible Hydro Power Plant has been enabled as well as the functioning of Bistrica and Đerdap Reversible Hydro Power Plants, construction of which is planned in the future.

Technical information

The transformer station is planned at the “Deponije (Landfills)” location in Vinča in accordance with the Detailed Regulation Plan. The constructed transformer station contains a 35 kV and 10 kV switchgear for indoor installation and outdoor 2×8 MVA power transformers.

Social and economic interest

From this substation, it is planned to supply power to all consumers at the landfill through a completely new power infrastructure that was built as part of the Public Private Partnership Contract. The new Vinča complex, with a completed 35/10 kV 2×8 MBA transformer station and connected to an overhead line of 35 kV, is provided with uninterrupted power supply.

Technical information

Field E18 on TS 400/110 kV is equipped with three high-voltage bus disconnectors, a high-voltage circuit breaker, a high-voltage measuring transformer, a control and protection cabinet, alterations to the SCADA system and the necessary construction works necessary for the installation of equipment. The equipment was delivered, tested and put into operation.

Social and economic interest

The importance of equipping the transformer station is to obtain a more reliable, safer and more stable power supply with better voltage. For us as a system, the reduction of electricity losses is important, which is very significant today.

Technical information

The executed works ranged from grounding and installation, complete installation of primary equipment for 110 GIS, 10 kV compartments and 110/10 power transformers to connection of protection and control of all cabinets in the substation. For the office space, a diesel generator was installed and its own 10/0.4 kV substation was equipped. Transformers are housed in closed transformer boxes, soundproofed with special materials.

Social and economic interest

The substation is located in a densely populated part of the city where it provides better electricity supply.

Technical information

• 35/10 kV, 2×8 MVA substation, delivery and construction of control and drive facility, access roads, transformer foundations, oil pit, fence and landscaping. The type of 35 kV switchgear is F400, manufactured by Schneider Electric. The cubicles are freestanding, air insulated with one busbar system with a separate compartment for low-voltage equipment, 36 kV rated voltage and 1250 A rated current. The 10 kV switchgear consists of 19 freestanding metal-clad cubicles, with one busbar system and pull-out switches.
• All cubicles are equipped with MICOM microprocessor protection and control devices, manufactured by Schneider Electric.
• The power transformers are 35/10 kV transformers with 8 MVA power and are mounted on newly built outdoor foundations. Power supply to 35/10 kV Kaluđerica Substation is provided from 110/35 kV Beograd IV Substation, via 346 AB “SM 1402-Boleč” power line.

Social and economic interest

Construction of the new 35/10 kV Kaluđerica substation contributes to the reliability and quality of power supply to two large Belgrade residential areas, Kaluđerica and Mali Mokri Lug, and enables further development of these areas, as well as of their economy.

Technical information

110/35/10 kV Kopaonik Substation is intended for transformation of voltage to a suitable distribution level and distribution of electricity to the consuming area. It consists of:

• Control and drive facility where plants the rated voltage of which amounts to 110 kV, 35 kV and 10 kV are located, underground cable level, rooms where other electrical equipment is located and auxiliary rooms;
• 110 kV SF6 gas-insulated switchgear with double busbar system;
• 35 kV plant with two busbar sections;
• 10 kV plant with two busbar sections;
• Two 110/36.75/10.5 kV power transformers with 31.5 MVA power;
• Portal pylon at the entrance to the plant for the purpose of introducing two 110 kV power lines into the substation building.

By reconstruction of 110 kV power line no. 1205 “Raška – Kopaonik” and construction of a connection, the facility is powered from 110/35 kV Raška Substation.

Social and economic interest

With the construction of the facility for 110/35/10 kV Kopaonik Substation, the total installed power of which amounts to 63 MVA, the reliability of the power supply to the consuming area was increased and backup power supply was provided.

110/35/10 kV Kopaonik Substation construction project entails connecting the substation to the neighboring facilities, as well as the main telecommunication route for connection to EMS fiber optic infrastructure, whereby voice and data transmission functionalities for operational management and business requirements are supported.

Technical information

The following facilities were constructed within the substation complex:

• 110 kV outdoor switchgear;
• 110/10 kV transformation;
• Control and drive facility with 10 kV switchgear;
• Access road and part of internal roads.

The 110 kV switchgear consists of two transformer bays, two line bays and sectioned busbars. In the first phase, one transformer bay, two line bays and 110 kV busbars were equipped with gear.

Description of key equipment

• T1 transformer: type: RT 31500; manufacturer: ETRA; rated gear ratio: 110±11×1.5% 10.5 kV; 50Hz rated frequency; 31.5/31.5 MVA rated power;
• 123 kV, 1250 A, 31.5 kA SF6 three-pole circuit breaker with one motor drive;
• Motor-driven 123 kV, 1250 A, 31.5 kA three-pole disconnector with grounding blades;
• 123 kV, 600/1/1/1 A current transformer;
• 123 kV, 110/√3/0.1/√3/0.1/√3 kV, kl.0 0.5; 25 VA inductive voltage transformers;
• 123 kV, 110/√3/0.1/√3/kV, kl.0 0.5; 25 VA capacitor voltage transformers.

Social and economic interest

It refers to safer and better-quality power supply to consumers.

Technical information

• 110 kV equipment 2 ABB power line circuit breakers;
• 2 TR circuit breakers;
• ABB outgoing feeder and busbar disconnectors;
• ABB current and instrument transformers;
• 35 kV Elektrošumadija plant with ABB protection;
• 10 kV plant with ABB protection.

Social and economic interest

The project was carried out due to the increase in the capacity of industrial consumers, as well as due to the construction of a new motorway that required the construction of several new 35 kV and 10 kV substations.

Technical information

Delivery and installation of equipment and cabinets for protection and control of 400/220 kV Obrenovac Substation, 20 400/110 kV Beograd Substation and 220/110 kV Kruševac 1 Substation. Complete equipment installation, wiring and testing of cabinets according to technical documentation.

Social and economic interest

Delivery, replacement and installation of the given cabinets has increased the reliability of protection in the power system, and therefore the consistency and quality of the delivered electricity.

Technical information

The substation comprises facilities and space for transformers. The buildings consist of two parts, a higher one housing the 35 kV (6 cubicles) plant and a lower one housing the 10 kV (10 cubicles) plant, control rooms (DC and AC distribution, remote control and monitoring) and rechargeable battery rooms. The substation has two power transformers, each with 4 MVA power (first phase).

The connection of the substation to the 35 kV network was made by the construction of a new double-circuit 35 kV cable line connecting 35/10 kV Čačak 4 Substation by means of the in/out system with the new 35/10 kV “Hipodrom” Substation. The connection point of the new 35 kV line is the existing conductive cell in 35/10 kV “Čačak 4” Substation Brđani terminal, respectively at the first angle suspension steel tower of the same line, while on the other side, the cable line is introduced into the corresponding 35 kV terminal cells (H2 and H5) in 35/10 kV “Hipodrom” Substation.

Social and economic interest

The construction of 35/10 kV Hipodrom Substation provides reliable power supply and sufficient amount of energy for the future industrial area, as well as for the entire consumption area in the territory of Preljina – Čačak.

Technical information

In a village called Izbište, near Vršac within the area of South Banat, 35/110 kV “Košava” Substation was built for wind farm requirements of the investor MK Fintel Wind.
The substation consists of two parts, the plant where voltage is transformed from 35 kV to 110 kV and a 110kV switchyard.

The construction of the facility was planned to be done in two phases.

In the first phase, which was completed, a transformation plant was constructed consisting of two 35/110 kV 40 MVA energy transformers and a 35 kV nine-cubicle plant. In addition, a 110 kV switchyard, consisting of five 110 kV bays: two transformer bays, two line bays and one coupler bay, was constructed, functionally tested and put into operation.

In the second phase, depending on the built wind turbines, it is envisaged to equip the 35/110 kV substation with another 40 MVA transformer. In the 110 kV switchyard, another transformer bay and line bay will be equipped with high-voltage equipment, which were left as a spare in the first phase of construction.

After the second phase, three 35/110 kV transformers with a total power of 2 40 MVA + 40 MVA will be operating.

Social and economic interest

The construction of wind farms results in generation of electricity from renewable sources, i.e. from wind energy, which makes Serbia strategically positioned as a green energy producer.

Wind power is one of the clean ways to obtain electricity, which is why it is recognized in the world as an important factor for the future of our planet. Wind is a renewable energy source, which means that, unlike fossil fuels, for example, it will not be consumed, and it does not release combustion gases during electricity generation that would increase the greenhouse effect on our planet and thus aggravate global warming.