The INTAS project focuses on three-phase and single-phase power transformers (including auto-transformers) with a minimum power rating of 1 kVA used electricity transmission and distribution networks or for industrial applications with the exception of small and special transformers such as:

  • instrument transformers, specifically designed to supply measuring instruments, meters, relays and other similar apparatus
  • transformers with low-voltage windings specifically designed for use with rectifiers to provide a DC supply
  • transformers specifically designed to be directly connected to a furnace
  • transformers specifically designed for offshore applications and floating offshore applications
  • single-phase transformers with rated power less than 1 kVA and three-phase transformers
  • transformers with less than 5 kVA
  • transformers, which have no windings with rated voltage higher than 1 000 V
  • traction transformers mounted on rolling stock
  • starting transformers
  • testing transformers
  • welding transformers
  • explosion-proof and mining transformers
  • transformers for deep water (submerged) applications.

It is to be pointed out that for the INTAS scope all the transformer above have been considered large products even if the current EN definition of large power transformers is more stringent.

Transformers are static electrical devices that are used in electrical power systems to transfer electrical power among circuits through the use of electromagnetic induction. The purpose of a transformer is to convert power from one system voltage to another.

This voltage relationship, or voltage ratio, is determined by the ratio of the number of turns on the primary winding to the number of turns on the secondary winding. A power transformer is a transformer for the purpose of transmitting electrical power.The definitions of the different types of power transformers are not harmonised around the world and may be different.

Find here the document " ​ ​Power Transformers – Introduction to measurement of losses"