References
Clients who trust us
We work with power utilities, industrial facilities and distribution companies across Bosnia and Herzegovina, Serbia, Croatia, Romania and Italy.
Our clients
- Overhaul and maintenance works on 6kV switchgear
- Overhaul and maintenance works on 10kV switchgear
- Overhaul and maintenance works on 35kV switchgear
- Supply of spare parts for MV switchgear
- Supply of spare parts for HV switchgear
- Supply of spare parts for MV switchgear
- Supply of spare parts for HV switchgear
- Overhaul and maintenance works on MOP switchgear
- NTSFF-1-420/525 – Disassembly and assembly of voltage instrument transformer, field testing, gas evacuation and cleaning with repair/replacement of damaged parts, replacement of insulation discs, manufacturing and rewinding of voltage instrument transformer windings, and high-voltage laboratory testing
- Testing: SF6 gas pressure and density, moisture in SF6 gas, partial discharges, circuit breaker contact resistance, mechanical timing of closing/opening, insulation resistance
- Supply: compressor unit for HV circuit breakers, TYPE: 206-89000 – Manufacturer: PTT (PrvaPetoletka) – Brake Technology
- Overhaul and maintenance works on 6kV switchgear in GTS 1, 2 and 5
- Overhaul and maintenance works on 35kV switchgear in GTS 1 and 2
- Overhaul and maintenance works on 110kV switchgear in GTS 1, 2, 3 and 5
- Testing of VT – Voltage Instrument Transformers
- Testing of CT – Current Instrument Transformers
- Testing of power transformers
- Testing of main earthing systems: measurement of earthing resistance, step voltage, touch voltage
- Supply of spare parts for power transformers. Voltage level: 110kV
- Overhaul and maintenance works on power transformers. Voltage level: 110kV
- Overhaul and maintenance works on power transformers. Voltage level: 10/0.4kV
- Overhaul of on-load tap changer of power transformer. Voltage level: 110kV
- Diagnostics and testing of power transformers. Voltage levels: 10, 35 and 110kV (winding resistance, transformation ratio and excitation current, tan δ, capacitance, leakage reactance, insulation resistance, moisture in cellulose insulation)
- Diagnostics and testing of instrument transformers VT and CT (winding resistance, transformation ratio, dielectric loss factor tan δ)
- Supply of spare parts for HV circuit breakers. Voltage level: 110kV
- Overhaul and maintenance works on HV circuit breakers. Voltage level: 110kV
- Construction and installation of enclosure fence for power transformer busbars. Voltage level: 110kV
- Continuous recording of voltage and current waveforms to determine flicker, harmonics, 3-phase RMS values of voltage and power, phase imbalance for voltage Uunb, current Aunb, Pst10', Plt2h at two connection points (110kV SRS Donasid and 30kV EAF)
- Service and testing of hydraulic control and regulation block for HV circuit breaker. Voltage level: 110kV.
- –General overhaul of piston hydraulic drive with additional cylinder
- –Visual inspection and disassembly of pipes
- –Honing
- –Hard chrome plating 20–25um.
- –Polishing of inner bore to Ra 0.2 um.
- –Front cover – finishing and insertion.
- Overhaul of MOP bottle. Part of control switching apparatus for HV circuit breaker management. Manufacturer: Electroputere Craiova, Romania. Voltage level: 110kV.
- Testing of main earthing systems: measurement of earthing resistance, step voltage, touch voltage.
- Overhaul and maintenance works on HV switchgear. Voltage level: 110kV.
- –110kV circuit breakers – Manufacturer: Elektroputere Craiova, Romania
- Overhaul and maintenance works on HV switchgear. Voltage level: 110kV.
- –110kV power transformer – Manufacturer: Elektroputere Craiova, Romania
- Overhaul and maintenance works on HV switchgear. Voltage level: 10/0.4 kV.
- –10kV power transformer – Manufacturer: Elektroputere Craiova, Romania
- Supply of spare parts for HV switchgear. Voltage level: 110kV.
- Transport preparation – Power transformer. Voltage level: 110kV – in accordance with technical and transport documentation.
- Installation of cable ducts and laying of main power supply cables for the substation.
- Connection works of the power transformer to the main substation, including installation of power cables/busbars, final termination, mechanical and electrical securing of connections, and functional testing prior to commissioning.
- Testing of main earthing systems: measurement of earthing resistance, step voltage, touch voltage.
- Overhaul and maintenance works on HV switchgear. Voltage level: 110kV.
- –110kV circuit breakers – Manufacturer: Elektroputere Craiova, Romania
- Overhaul and maintenance works on HV switchgear. Voltage level: 110kV.
- –Replacement of control cabinets for disconnectors and earthing switches – full dismantling of existing equipment, installation of new cabinets, integration into the control system and functional verification. Manufacturer: Koncar Zagreb
- Supply: SF6 gas
- SF6 gas installation services
- Supply: spare parts for HV circuit breakers. Voltage levels: 6, 10 and 110kV
- Overhaul and maintenance works on HV circuit breakers. Voltage levels: 6, 10 and 110kV
- Moisture drying service in SF6 gas in 110/10kV substation zones and issuance of final testing protocol
- Fault diagnostics on GIS 123kV switchgear – Elixir Prahovo
- –Disassembly and testing of voltage instrument transformers VT. Voltage level: 110kV (winding resistance, transformation ratio, dielectric loss factor tan δ)
- –Preparation and primary testing of voltage instrument transformers VT = 63kV – 50Hz (110kV/√3)
- Overhaul and maintenance works on power transformer T1 in TS 110/10kV. Power: 31.5 MVA, transformation ratio: 110/10kV
- Diagnostics and testing of power transformer – voltage level: 110/10kV (winding resistance, insulation resistance, transformation ratio and magnetising current, tan δ, capacitance, dielectric breakdown strength of oil)
- Repair service for GIS 110kV switchgear in OHL bay 165
- –Supply and installation of new insulation discs, assembly of switchgear components, evacuation and filling with SF6 gas
- –SF6 gas leak testing (detection) and quality control
- –Verification of all apparatus in OHL bay 165 (circuit breaker, disconnector, earthing switch, etc.)
- –High-voltage testing at line voltage 50Hz, 70kV
- –Preparation of reports on all completed works and performed tests
- –Commissioning
- Supply and installation service: porcelain bushing 123kV – GIS switchgear TS 110/10kV Elixir Prahovo
- Supply and installation service: voltage instrument transformer VT – TYPE: UH 11-15, insulation level: 123kV, Manufacturer: Energoinvest Sarajevo
- –Installation and assembly of 3 units – VT
- –Supply of materials for connecting primary and secondary terminals of VT
- –Connection of primary and secondary terminals of VT
- –Commissioning
- Repair of air leaks in tap changer circuit breaker chambers. Voltage level: 110kV
- Overhaul and maintenance works – TS 110/6kV – Šabac 4
- –Overhaul of busbar disconnectors – 3-pole – TYPE: HPG Energoinvest
- –Overhaul of line disconnectors with earthing – 3-pole – TYPE: HPG Energoinvest
- –Overhaul of oil circuit breakers 110kV – TYPE: HPGE 11A/16
- –Overhaul of motor-spring drive with control and signalling installation
- –Measurement of voltage drops on circuit breaker contacts
- –Measurement of closing/opening synchronisation on circuit breakers
- –Measurement of voltage drops on busbar and line disconnectors
- –Checking of secondary connections on instrument transformers in the switchgear
- –Checking of expansion membranes on instrument transformers in the switchgear
- –Cleaning and application of silicone coating, checking of primary connections on surge arresters
- Overhaul and maintenance works on 6kV oil circuit breakers, TYPE: HG 6a/8c 630/1250A, Manufacturer: Energoinvest Sarajevo
- –Service works on motor-spring drive of circuit breaker
- –Inspection of arc extinction chamber
- –Replacement of worn contact fingers
- –Replacement of worn contact tips
- –Replacement of worn arcing contacts
- –Seal inspection and repair
- –Checking of control and signalling installation
- –Measurement of voltage drop, closing/opening synchronisation, dielectric breakdown strength of oil and insulation resistance
- –Commissioning
- Overhaul and maintenance works on HV switchgear. Voltage level: 6kV
- Overhaul and maintenance works on HV switchgear. Voltage level: 35kV
- Overhaul and maintenance works on HV switchgear. Voltage level: 110kV
- Supply of spare parts for HV switchgear. Voltage levels: 6, 10, 35 and 110kV
- Overhaul and maintenance works on HV switchgear. Voltage level: 6kV
- Overhaul and maintenance works on HV switchgear. Voltage level: 110kV
- Supply of spare parts for HV switchgear. Voltage levels: 6, 10, 35 and 110kV
- Overhaul and maintenance works on HV switchgear. Voltage level: 6kV
- Overhaul and maintenance works on HV switchgear. Voltage level: 35kV
- Overhaul and maintenance works on HV switchgear. Voltage level: 110kV
- Electrical primary testing and verification of circuit breaker closing/opening functionality, issuance of test protocols. Voltage levels: 6 and 35kV
- Supply of spare parts for HV switchgear. Voltage levels: 6, 35 and 110kV
- Supply and installation service for MV load-break disconnectors with integrated fuse holder – TYPE: CS1N 12kV/630A – Manufacturer: TSN Maribor
- Supply of spare parts for HV switchgear. Voltage level: 6kV
- Supply of spare parts for HV switchgear. Voltage level: 35kV
- Supply of spare parts for HV switchgear. Voltage level: 110kV
- Overhaul and maintenance works on HV switchgear. Voltage level: 220kV – TYPE: SFE 14 – Manufacturer: Energoinvest Sarajevo
- –Inspection and replacement of all contact system components (moving and fixed arcing contacts, main contacts and nozzle)
- –Evacuation and filling with SF6 gas
- –Overhaul of drive mechanism, TYPE: EPM 255
- –Inspection and repair of seals
- –Replacement of closing and opening valves
- –Checking of dimensions K and X on the drive mechanism
- –Cleaning of compressed air tanks
- –SF6 gas leak detection
- –SF6 gas quality verification
- –Measurement of voltage drop on main contacts of the circuit breaker
- –Verification of kinematic stroke (stroke and main contact penetration, speed measurement and damping verification)
- –Measurement of closing/opening times of the circuit breaker
- –Checking of alarms and interlocks against SF6 gas and air pressure drop
- –Verification of local and remote control and signalling
- Supply of spare parts for HV switchgear. Voltage level: 110kV
- Supply of spare parts for HV switchgear. Voltage level: 220kV
- Supply of SF6 gas
- Supply: compressor unit for HV circuit breakers SFE 14-1, TYPE: 206-89000 – Manufacturer: PTT (PrvaPetoletka) – Brake Technology
- Overhaul and maintenance works on MV switchgear
- –Servicing and testing of MV circuit breakers: TYPE: PU-105.150 – Manufacturer: MINEL FRA
- –Servicing and testing of MV circuit breakers: TYPE: PU-104.150 – Manufacturer: ElektroSrbija FEO
- –Servicing and testing of MV circuit breakers: TYPE: PU-356.750 – Manufacturer: ElektroSrbija FEO
- –Servicing and testing of MV circuit breakers: TYPE: HG 6a/8c – Manufacturer: Energoinvest Sarajevo
- Supply of spare parts for HV switchgear. Voltage level: 110kV
- Supply of spare parts for MV switchgear. Voltage levels: 10 and 35kV
- Overhaul and maintenance works on HV switchgear. Voltage level: 110kV
- –110kV circuit breaker – HPGE 11/14 – Manufacturer: Energoinvest Sarajevo
- –Motor-spring drive – TYPE: CMR-2B
- Supply of spare parts for HV switchgear
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