CG Electric Systems Hungary Zrt.

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

Two busbars for supply
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

Download reference list with details

News

Actualities

80MVA power transformer

You can find our current news on our LinkedIn page !

Projects

Gallery

Fisher Street

UKPN, London, Anglia

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