Electric Department

Our specialists from the Electric Department carry out major overhauls, provide revamp and upgrade services and perform installation work for turbine generators of all types, hydrogenerators, high-voltage motors and synchronous compensators.

The scope of work includes disassembling and reassembling generators with removing rotors; checking turbine generators for gas tightness and removing leakages; repairing the active steel; testing for leakage and heating; rewedging the stator slots; re-soldering the stator winding heads with re-insulation; replacing the housing compounded insulation of a bar, a coil; electrical testing, measuring, hydraulic testing.

When repairing rotors and other generator components, we repair slip rings and replace insulation; repair fans and current leads; check for gas tightness and hydraulic tightness; repair retaining rings and slip rings; repair current leads; replace the insulation of the central current lead and busbar; rehabilitate and replace the rotor winding coils; rewedge the rotor slots; replace and repair the insulation under the retaining rings; repairing the brush-contact device; bore and polish slip rings; repair gas coolers; repair and manufacture the stator winding terminal leads; repair the generator gas system.

Our company has an extensive experience in performing extremely complicated repair work for generators with replacing stator windings (the ТГВ-200M generator at Kurakhivska TPP in 2015, the ТГВ-200-MT3 generator at Ghorashal TPP in Bangladesh generator in 2017). In the years 2020-2021, we performed a major overhaul and then emergency repair of the TBB-800-2У3 generator, stage No.7 and the BT-6000 operating exciter at Slovianska TPP, during which we repaired the slot sleeves and replaced the end boxes on the rotor, and we replaced the coil with restoration of the geometry of other coils and restoration of the insulation.

Our company also has a very close relationship with Elektrovazhmash plant, a subdivision of Ukrainian Energy Machines, and other manufacturers and suppliers of spare parts for generators, so we can provide our customers with repair services and supply spare parts.

A separate area of work performed by the Electric Department is to overhaul transformers of voltage classes from 6 W to 750 kV and with a power rating from 1 MVA to 1250 MVA.

Starting from 2017, when we greatly extended and upgraded our range of equipment for repairing transformers, our company has repaired more than 40 transformer of different types both at power plants and power generation facilities in Ukraine and abroad (5 transformers at Moldovan SDPP in 2021 and 4 transformers at Ghorashal TPP in Bangladesh in 2017).

In the years 2019-2020, our company repaired about 20 transformers at the facilities owned by the State Enterprise National Nuclear Energy Generating Company Energoatom, most of which are located at Pivdennoukrainsk NPP, and at Rivne NPP and Khmelnytskyi NPP, including the most powerful unit transformers in Ukraine, the ТНЦ-1250000/330 transformers, transformers on the switchgear and the ТНЦ-1250000/330, АОДЦТН-333000/750/330/150, АТДЦТН-250000/330/110-У1, ТРДЦН-63000/330 and ТДЦ-250000/330 autotransformers, and the РОДЦ-110000/750 shunt reactors. We also repaired the transformers at DTEK-owned Dobrotvir TPP and Kryvyi Rih TPP and transformers for the Ukrainian South-Western Railway, for Dnipro section of NEC Ukrenergo, Poltavaoblenergo and a number of industrial enterprises.

The scope of work for repairing transformers includes dismantling the transformer units (expansion tank, exhaust pipe, thermal bellows filter); removing the transformer bushings; opening and repairing the active part; repairing the detachable part of the tank; repairing the switching device; repairing the cooling system; repairing or replacing the transformer bushings; installing the units; assembling the transformer; encapsulating the active part of the transformer; draining, treating and degassing transformer oil; electrical testing and inspecting oil and solid insulation.

We carry out auxiliary work during the major overhaul of transformers: handling work for moving transformers using hydraulic jacks and pushers with a capacity of up to 400 tons; pre-drying and drying the transformer insulation; recovering the transformer oil properties (drying, cleaning, degassing, regenerating).

As with other areas of servicing power generation equipment, along with repair work for transformers, we offer to supply our customers with spare parts and consumables. Thanks to our close ties and partnerships with Zaporizhtransformator and other Ukrainian and foreign manufacturers, we arrange deliveries of high-voltage bushings, gas and jet relays, flexible casings, components for the cooling system, high-quality rubber for replacing seals, disk shutters and other spare parts.