Transformator Business Unit

Transformator BU
Introduction
The Power Transformer factory’s history dates back more than 130 years as the first transformer in the work was built by GANZ in 1885, the factory is strategically located in the town of Tapioszele, 80 kms from the capital city of Budapest. The Power Transformer division specializes in the design, manufacture and testing of substation transformers, generation transformers, auxiliary transformers, mobile transformers and traction transformers from 20 to 600 MVA (1000 MVA for autotransformers) from 52 to 800 kV.
Transformator BU
Strategy
With more than 130 years’ experience in tailor made transformers CG Hungary, formerly known as GANZ, is the partner to find the right solutions for your challenges:
- CG Hungary is specialized in special transformer application, and tailor made designs.
- CG Hungary is market leader in the manufacturing of Biofluid immersed power transformers, which provide safe solutions for special requirements of fire protection, environmental safety, space limitations and cost savings.
- CG Hungary has produced transformers with very low noise requirements, fulfilling successful the most extreme requirements of German and Scandinavian markets.
- CG Hungary has an excellent record for short-circuit tests with one of the highest reliability numbers since 1987, proving our design and manufacturing rules.
Transformator BU
From the beginning to the present

1885 | Patent of closed magnetic circuit transformer |
1950 | First transformer on 245 kV |
1967 | First transformer on 420 kV |
1978 | First transformer on 750 kV |
2002 | First transformer in the world for 123 kV with ester liquid |
2008 | Beginning of manufacturing mobile transformers |
2008-2013 | Factory development: Dust-free, air conditioned winding workshop Test bay upgared to 800 kV transformers |
2009-2011 | 765 kV transformer export to Indian market |
2015 | Transformers for oil and gas projects |
2015 | Largest unit (250 MVA, 420 kV) tested for shortcircuit withstand at KEMA |
2019 | Refurbishment of our 40 years old 750 kV transformers |
Transformator BU
Manufacturing limits

Production range: 20-600 MVA
Voltage: 72,5-800 kV
Frequency: 16,7-60Hz
Annual capacity: 10 000 MVA
Equipment limits:
Core Stacking: 200 t
Winding :
dia.: 3000 mm
height: 3000 mm
weight: 20 t
Crane capacity: 240 t
(limit for active part only)
Workflow
From design to energization
Design characteristics
Our designers are familiar with all international and national standards. Every transformer is individually designed to its specific requirements.
We use commercial and developed software during the design process to increase product reliability for the following analysis:
- loss and noise calculation,
- voltage distribution calculation and FEM electrical field analysis,
- short-circuit resistance calculation,
- eddy current loss and heat calculation,
- earthquake resistance calculations.



Factory
- Up-to-date manufacturing facilities
- Separated workplaces according workflow
- Winding workshop:
- dust proof covering
- air conditioning
- slight overpressure
- Inspection point before drying
- Computer controlled, full parameter driven process optimization:
- Temperature, Vacuum, Water extraction
Test bay
3 transformers at the same time
-
Impulse voltage test
- 2 400 kV
Separate source voltage test
- 700 kV/350 kVA
- 350 kV/175 kVA
- 60/30/10 kV/1300 kVA
- Supplied from motor-generator groups
Induced voltage test
- max. 170 Hz
- max. 66 kV supply
- Back ground PD level: < 15 pC
Short circuit and heat run tests
- max. 200 MVAr

Erection – Energization
Own service team
95% of our transformers are assembled by ourselves
Site testing and as if needed site trainings for the operating personnel
From 1990 to the present
Reference
42524 MVA total
News
Actualities
Projects
Gallery
Fisher Street
- 3 x 33 MVA
- 132 / 11 kV
- Three water cooled power transformer in the inner city of London
- Special transformer design for the limited space inside the building
- On the transformers oil-water heat exchangers are installed and the water-air heat exchangers are on the top of the building
Have a question?
Contact
Jan Prins
Head of Sales and Power Transformer BU
Mihály Baka
Sales - Hungary
Lajos Harai
Sales - Romania / Ukraine
Gergely Szűcs
Sales - North / West Europe




phone: +36 1 478 6701
jan.prins@cgglobal.com
phone: +36 30 3048587
mihaly.baka@cgglobal.com
phone: +36 30 2697423
lajos.harai@cgglobal.com
phone: +36 1 483 6783
gergely.szucs@cgglobal.com
Jan Prins
Head of Sales and Power Transformer BU
phone: +36 1 478 6701
jan.prins@cgglobal.com

Mihály Baka
Sales - Hungary

phone: +36 30 3048587
mihaly.baka@cgglobal.com
Lajos Harai
Sales - Romania / Ukraine

phone: +36 30 2697423
lajos.harai@cgglobal.com
Gergely Szűcs
Sales - North / West Europe

phone: +36 1 483 6783