Substations

CROATIA
1. Međurić Substation 220/110 kV
Investor: HOPS Croatia
Project Description: Reconstruction of bays =E1 to =E16 within the 110 kV switchyard. Civil engineering works: geodetic surveys, dismantling of existing steel structures for busbar gantries, demolition of existing gantry foundations, earthworks, reinforced concrete works (construction of foundations and cable trenches), drainage, supply and assembly of new steel structures, and civil works within the facility building. Other works and services: geodetic survey of the as-built state, preparation of the detailed design and as-built documentation. Electrical assembly works: dismantling of old joining and suspension equipment, supply and assembly of new joining and suspension equipment, installation of 110 kV temporary bypasses (Tr1-Tr2, HZ Novska 1 and 2, Transmission Line Daruvar - Tr3), supply and installation of lightning protection, supply and installation of outdoor lighting equipment, supply and installation of cable trays, and the supply, laying, and connection of signal and power cables.

2. Plat Substation 220/110/35/20(10) kV
Investor: HOPS Croatia Project Description: Preparation of project documentation (Main, Detailed, and As-Built designs), fabrication of steel-lattice tower structures, fabrication of steel-lattice support structures for apparatus and gantries, execution of civil and electrical assembly works for the construction of the new 220/110/35/20(10) kV Plat Substation, supply of primary and secondary equipment, execution of civil and electrical assembly works for the construction of connecting transmission lines and cable lines at voltage levels of 220 kV, 110 kV, 35 kV, and 20 kV, functional testing, and commissioning.
INTERNATIONAL PROJECTS
1. Kijevska Substation 750/330 kV
Investor: UKRENERGO (Ukraine)
Project Description: Design (detailed and as-built designs), civil engineering and electrical assembly works, supply and installation of primary and secondary equipment (circuit breakers, disconnectors, voltage and current transformers, surge arresters, relay protection and automation systems, AC/DC auxiliary power supply, communication equipment), functional testing, and commissioning. The project included: 3 phases (1 set) of single-phase 750/330/15.75 kV transformers with a rated power of 3x333 MVA; 3 phases (1 set) of 110 kV phase-shifting transformers with a rated power of 3x92 MVA; 1x750 kV transformer bay; 1x330 kV transformer bay; 2x330 kV line bays; and the expansion of 330 kV double-busbars (5 bays).

2. Vinnytska Substation 750 kV
Investor: UKRENERGO (Ukraine)
Project Description: Supply and assembly of 750 kV disconnectors; supply of voltage measuring transformers, surge arresters, support insulators, line chokes (HF chokes), and capacitors.

3. Mostar 7 Substation
Investor: Elektroprijenos BiH (Bosnia and Herzegovina)
Project Description: Design (main and as-built designs), obtaining permits (building and occupancy permits), supply and installation of primary and secondary equipment, and civil engineering works. Functional testing and commissioning included: 2 new power transformers with a rated power of 40/40/27 MVA (manufactured by KONČAR-Distributivni i specijalni transformatori d.d. Zagreb) with a transformation ratio of 110/10.5(21)/10.5 kV and a primary on-load tap changer range of $110 \pm 10 \times 1.5\%$ kV (from 93.5 kV to 126.5 kV), with a maximum primary winding voltage of 126.5 kV. The scope also covered: 12 high-voltage 110 kV bushings, 18 medium-voltage switchgear units with a rated voltage of 20 kV, control and protection for 110 kV, control and protection for 20 kV and 10 kV, equipment procurement, and the upgrade and testing of the remote control system (SCADA).

4. Mostar 4 Substation
Investor: Elektroprijenos BiH (Bosnia and Herzegovina)
Project Description: Procurement of a 220/110/10.5 kV, 150 MVA, YNa0 d5 power transformer. The scope of supply included: design, manufacturing, factory testing, transport to the installation site, unloading, supervision of assembly, and testing and supervision of the commissioning of the power transformer (150 MVA, type ARZ150000-245) with the associated tap changer and voltage regulator.