Power Transformers - 2.5 - 100MVA, up to 170kV

Power Transformer

2.5 - 100MVA, up to 170kV

Power transformers are very important components in many electricity distributions and transmissions around the world. In the last 40 years, KONČAR D&ST has delivered over 4,000 units with a total capacity of 85,000 MVA to over 110 countries.

Basic Technical Data

KONČAR D&ST manufactures oil-immersed power transformers and special transformers up to 160 MVA, for the highest system voltage up to 170 kV. Voltage regulation is carried out by reconnecting the tappings by means of an on-load tap changer under load and off-circuit tap changer or reconnection bolts under tank cover at no voltage condition. Transformers are intended for outdoor operation under various climatic conditions as well as for indoor use. Transformers are designed and tested in accordance with the standard IEC60076-7, but other international standards can be applied as well. All the transformers can be loaded above rated power in accordance with IEC60076-7.

Add to Cart

Download Brochure

Features

Core

Core is made of cold rolled grain oriented magnetic steel sheets of low specific losses. Sheets are mutually insulated by a thin layer of inorganic insulation, resistant to transformer oil and high temperatures.

Windings

Windings are constructed to meet the requirements with regard to the mechanical resistance to short-circuit forces, permissible temperature rise and test voltages. They are cylindrical in shape, made of conductors of a high conductivity, insulated by paper or enamel. Depending on the current and voltage, various winding types such as disc continuously wound, spiral, layer and interleaved type are used.

Insulation

Basic insulation material are the pressboards mould into necessary shapes and transformer oil. Insulation between the windings and to earthing parts consists of oil and pressboard barriers shaped like cylinders and caps. Applied mineral oil is in accordance with the standard IEC 60296. Transformers filled with synthetic esters (e.g. MIDEL 7131) are available on special request.

Ability to Withstand Short-Circuit

Transformers are designed and manufactured in such a way to withstand short-circuit forces, which is proved by testing acc. to standard IEC 60076-5 or relevant calculations, respectively.

Noise

Noise level is measured acc. to standard IEC 60076-10. Transformers with reduced noise level are available on request.

Tank

Tank is made of steel sheets and is capable of withstanding a certain overpressure and vacuum without permanent deformations.

Corrosive Protection

Since our transformers operate under different hard environmental conditions, series of actions are taken, in order to ensure proper corrosive protection. Finished tanks, covers and other metal parts are prepared and painted following ISO 12944 standard according to climate conditions C1 up to C5M.