Design and production of transformers and reactors of all voltage classes from 0.5 to 1150 kV and up to 630 MVA.
АО «Холдинг ЭРСО»
Moscow (headquarters) · Zubovo near Ufa (Ufimski Transformatorny Sawod) · Moscow (Elektrozavod)New on Amplifa
About ERSO
The ERSO electrical engineering holding was founded at the end of 2020 on the basis of the assets of AO Elektrozavod and comprises design bureaus, service and test centers, laboratories and several production sites, including the Ufimski Transformatorny Sawod (UTZ) with 12 GVA of installed capacity. The portfolio comprises more than 1,500 types of transformers and reactors for voltages from 0.5 to 1150 kV and ratings up to 630 MVA, including power and autotransformers for 110–750 kV, shunt reactors up to 1150 kV, distribution transformers, electric furnace transformers, traction transformers for railways, as well as SF6 power circuit breakers and switchgear (KRU/KRUE). As an official supplier to the Russian nuclear industry (licenses from Rostechnadzor), ERSO also supplies power generators such as Rosseti, RusGidro and Rosatom, industrial metallurgical companies, the oil and gas industry and rail transport. The UTZ in Zubovo near Ufa produces transformers up to 500 kV/250 MVA on 34,000 m² of main hall space with 400 employees and has a test center with an impulse voltage test generator from Haefely Test AG up to 2,000,000 V. Production is complemented by EPCM engineering services, service, maintenance and repair of high-voltage installations as well as the manufacture of secondary electrical equipment. The company is certified to ISO 9001 and ISO 22163:2023.
- Site
- 3 Moscow
- Processes
- Design and production of power transformers, Autotransformers for transmission networks, Shunt reactors (reactor coils), Distribution transformers, Electric furnace transformers, Traction/substation transformers for railways, Converter and phase-shifting transformers, Mobile substations 35–220 kV
- Materials
- Transformer oil, Non-flammable liquid dielectric, SF6 (electronegative gas), Amorphous steel, Copper (windings/wires), Copper, SF6 gas
- Certificates
- ISO 9001:2015 (or GOST R ISO 9001:2015), ISO 22163:2023 (rail transport), Rostechnadzor licenses (Federal Service for Environmental, Technological and, ISO 9001, Rostechnadzor license (nuclear industry)
- Founded
- 2020
- Employees
- 400 (Ufimski Transfo
- Industries
- Power generation, transmission and distribution, Nuclear industry, Industrial enterprises / metallurgy, Oil and gas production and transport, Rail transport, Nuclear industry (official supplier to the nuclear sector)
- 01
Design and engineering
- 02
Sheet metal cutting (automatic sheet cutting line)
- 03
Winding production (copper wires)
- 04
Assembly of transformers and reactors
- 05
High-voltage testing (UTZ test center, up to 2 MV)
- 06
Shipping and commissioning
- 07
Service, maintenance and repair
Materials and Processes
Copper
Transposed and enameled wires for transformer windings.
Transformer oil
Insulating and cooling medium for oil transformers, including maintenance and repair use.
SF6 gas
Insulating gas for circuit breakers 35–550 kV, KRUE switchgear and SF6 transformers.
Amorphous steel
Magnetic cores for distribution transformers in development; reduction of no-load losses by a factor of 4.
Non-flammable liquid dielectric
For hermetically sealed network transformers.
Locations
Ufimski Transformatorny Sawod, Zubovo
RUProduction site; transformers up to 500 kV / 250 MVA
- Materials
- Transformer oil, copper, electrical steel
- Automatic sheet cutting line
- Impulse voltage test generator Haefely Test AG up to 2,000,000 V
- Test center 1,409 m²
Elektrozavod, Moscow
RUProduction site; large transformers up to 750 kV, reactors
- Materials
- Copper, transformer oil
- High-voltage test hall
Headquarters, Moscow
RUHolding administration and sales
Inside the production
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Design and production of power transformers | – | – | – | – | Copper (windings), Transformer oil, Amorphous steel (magnetic cores in development), Electrical steel |
| Autotransformers for transmission networks | – | – | – | – | – |
| Shunt reactors (reactor coils) | – | – | – | – | – |
| Distribution transformers | – | – | – | – | Transformer oil, non-flammable liquid dielectric |
| Electric furnace transformers | – | – | – | – | – |
| Traction/substation transformers for railways | – | – | – | – | – |
| Converter and phase-shifting transformers | – | – | – | – | – |
| Mobile substations 35–220 kV | – | – | – | – | – |
| High-voltage power circuit breakers (tank-type circuit breakers) | – | – | – | – | SF6 (electronegative gas) |
| Switchgear manufacturing (KRU/KRUE) | – | – | – | – | SF6 (electronegative gas) |
| High-voltage test technology | – | – | – | – | – |
| Service: assembly, commissioning, repair of transformers | – | – | – | – | Transformer oil, SF6 (electronegative gas) |
| EPCM / turnkey construction of energy facilities | – | – | – | – | – |
| Cable and wire production (historical/JV) | – | – | – | – | Copper |
2 Anlagen & Maschinen
| Machine | Manufacturer / model | Quantity | Working area | Year built | Site |
|---|---|---|---|---|---|
| Impulse voltage test generator | Haefely Test AG | 1 | – | – | – |
| Automatic steel cutting line | – | 1 | – | – | – |
Additional services
Reference customers
Quality
The quality management system is certified to ISO 9001; in addition, the ISO-22163:2023 certification for the rail transport industry is in place. Licenses from Rostechnadzor permit the design, manufacture and supply of electrical equipment for nuclear power plants.
| Evidence | Ufimski Transformatorny Sawod, Zubovo | Elektrozavod, Moscow |
|---|---|---|
| ISO 9001 | ||
| ISO 22163:2023 (rail transport) | ||
| Rostechnadzor license (nuclear industry) |
History
- 1920er–1940e
Origins at the Moscow Elektrozavod; supplies for major power plant and industrial projects, including the Magnitogorsky, Taishetsky, Verkh-Isetsky plants and the Cherepovets metallurgical combine.
- 1975–1979
Equipment for the Volgograd–Donbass HVDC link (800 kV) and the 1150 kV three-phase AC line Ekibastuz–Center, including the most powerful shunt reactor, 300 MVA.
- 2004
The Ufa plant Elektroapparat became part of OAO Elektrozavod; founding of OOO ERSO Inzhiniring.
- 2005–2009
Construction and commissioning of the new Ufimski Transformatorny Sawod (UTZ) in Zubovo near Ufa; opening in 2009.
- 2010
Elektrozavod masters the production of large transformers for 750 kV; first 417 MVA transformer for the Kalinin NPP; controlled shunt reactor 180 MVA / 500 kV.
- 2020
Founding of the ERSO holding on the basis of the assets of AO Elektrozavod by decision of the AFK Sistema group.
- 2022
Resumption of in-house production of secondary electrical equipment on the basis of AO Ufa Plant Elektroapparat; opening of a representative office in Tashkent.
- 2026
Investment of RUB 2.2 billion in the modernization of the UTZ announced.