ENERGO-INVEST SERVIS d.o.o.
References

Clients who trust us

We work with power utilities, industrial facilities and distribution companies across Bosnia and Herzegovina, Serbia, Croatia, Romania and Italy.

8+Our clients
5countries
RS · BA · HR · RO · ITRegion

Our clients

Elixir Prahovo DOO Prahovo
Elixir Prahovo DOO Prahovo
Izvedeni radovi
  1. 01Supply: SF6 gas
  2. 02SF6 gas installation services
  3. 03Supply: spare parts for HV circuit breakers. Voltage levels: 6, 10 and 110kV
  4. 04Overhaul and maintenance works on HV circuit breakers. Voltage levels: 6, 10 and 110kV
  5. 05Moisture drying service in SF6 gas in 110/10kV substation zones and issuance of final testing protocol
  6. 06
    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)
  7. 07Overhaul and maintenance works on power transformer T1 in TS 110/10kV. Power: 31.5 MVA, transformation ratio: 110/10kV
  8. 08Diagnostics 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)
  9. 09
    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
  10. 10Supply and installation service: porcelain bushing 123kV – GIS switchgear TS 110/10kV Elixir Prahovo
  11. 11
    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
  12. 12Repair of air leaks in tap changer circuit breaker chambers. Voltage level: 110kV
Elixir Zorka - Mineralna đubriva DOO Šabac
Elixir Zorka - Mineralna đubriva DOO Šabac
Izvedeni radovi
  1. 01
    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
  2. 02
    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
HBIS GROUP Serbia Iron & Steel d.o.o. Beograd
HBIS GROUP Serbia Iron & Steel d.o.o. Beograd
Izvedeni radovi
  1. 01Overhaul and maintenance works on 6kV switchgear in GTS 1, 2 and 5
  2. 02Overhaul and maintenance works on 35kV switchgear in GTS 1 and 2
  3. 03Overhaul and maintenance works on 110kV switchgear in GTS 1, 2, 3 and 5
  4. 04Testing of VT – Voltage Instrument Transformers
  5. 05Testing of CT – Current Instrument Transformers
  6. 06Testing of power transformers
  7. 07Testing of main earthing systems: measurement of earthing resistance, step voltage, touch voltage
Elektrodistribucija Srbije

Elektrodistribucija Srbije

Izvedeni radovi
  1. 01
    Overhaul and maintenance works on MOP switchgear Beograd 110/10 kV - TS Obilić
    • Evacuation of SF6 gas
    • Dismantling of voltage instrument transformer – VT
    • Dismantling of cable outlets (connector and cable connections)
    • Preparation and inspection of new cable outlet for installation
    • Installation of cable outlets with associated elements (new contact sockets, insulators and seals)
    • Adjustment of linear travel of 110kV circuit breaker (measurement of contact transition resistance, closing/opening times, and inter-phase synchronism)
    • Testing and installation of Voltage Instrument Transformer – VT - 110kV
    • Testing of SF6 gas and filling with gas to nominal pressure in field E-2, with complete field testing.
    • Replacement of silica gel, and inspection of circuit breakers and disconnectors in all fields of TS 110/10 kV – Obilić.
    • Replacement of three-pole insulating discs
    • Replacement of worn contacts and sockets on 110kV earthing switch.
    • Replacement of core of Voltage Instrument Transformer – VT 110 kV.
    • Replacement of worn contacts and sockets on voltage instrument transformer VT 110KV.
    • Cleaning of cable outlet.
Elnos Group
Elnos Group
Izvedeni radovi
  1. 01Overhaul and maintenance works on HV switchgear. Voltage level: 6kV
  2. 02Overhaul and maintenance works on HV switchgear. Voltage level: 110kV
  3. 03Supply of spare parts for HV switchgear. Voltage levels: 6, 10, 35 and 110kV
Commi S.R.L.
Commi S.R.L.
Izvedeni radovi
  1. 01Supply of spare parts for power transformers. Voltage level: 110kV
  2. 02Overhaul and maintenance works on power transformers. Voltage level: 110kV
  3. 03Overhaul and maintenance works on power transformers. Voltage level: 10/0.4kV
  4. 04Overhaul of on-load tap changer of power transformer. Voltage level: 110kV
  5. 05Diagnostics 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)
  6. 06Diagnostics and testing of instrument transformers VT and CT (winding resistance, transformation ratio, dielectric loss factor tan δ)
  7. 07Supply of spare parts for HV circuit breakers. Voltage level: 110kV
  8. 08Overhaul and maintenance works on HV circuit breakers. Voltage level: 110kV
  9. 09Construction and installation of enclosure fence for power transformer busbars. Voltage level: 110kV
  10. 10Continuous 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)
  11. 11
    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.
  12. 12Overhaul of MOP bottle. Part of control switching apparatus for HV circuit breaker management. Manufacturer: Electroputere Craiova, Romania. Voltage level: 110kV.
  13. 13Testing of main earthing systems: measurement of earthing resistance, step voltage, touch voltage.
Tenaris
Tenaris
Izvedeni radovi
  1. 01
    Overhaul and maintenance works on HV switchgear. Voltage level: 110kV.
    • 110kV circuit breakers – Manufacturer: Elektroputere Craiova, Romania
  2. 02
    Overhaul and maintenance works on HV switchgear. Voltage level: 110kV.
    • 110kV power transformer – Manufacturer: Elektroputere Craiova, Romania
  3. 03
    Overhaul and maintenance works on HV switchgear. Voltage level: 10/0.4 kV.
    • 10kV power transformer – Manufacturer: Elektroputere Craiova, Romania
  4. 04Supply of spare parts for HV switchgear. Voltage level: 110kV.
  5. 05Transport preparation – Power transformer. Voltage level: 110kV – in accordance with technical and transport documentation.
  6. 06Installation of cable ducts and laying of main power supply cables for the substation.
  7. 07Connection 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.
  8. 08Testing of main earthing systems: measurement of earthing resistance, step voltage, touch voltage.
Donalam SRL
Donalam SRL
Izvedeni radovi
  1. 01
    Overhaul and maintenance works on HV switchgear. Voltage level: 110kV.
    • 110kV circuit breakers – Manufacturer: Elektroputere Craiova, Romania
  2. 02
    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
Contact

Have a project or fault?

Contact us for expert consultation. We offer field interventions, service inspections and technical support for all Energoinvest equipment.

Working hours
Mon–Fri: 08:00–16:00
Address
Vladimira Popovića 26, 11000, Belgrade, Serbia
Contact us