Laboratory for Physical and Chemical Testing

Laboratory for Physical and Chemical Testings exists within the Končar group for more than 65 years,  carrying out testing and research of physical and chemical properties of materials for electrotehnical application. 

In last two decades, the basic activity of the Laboratory is the testings of insulating liquids and paper for electrical insulation in accordance with requirements of national and international standards (HRN, EN, IEC,ISO, ASTM).


Laboratory for Physical and Chemical Testings is competent, according to the requirements of HRN EN ISO/IEC 17025:2007, for testing of physical and chemical properties of transformer oil - Acreditation certificate No.1174/09 –HAA,Croatia .         


Accreditation Certificate No. 1174

Tehnical capabilities:

  • Physical, chemical and dielectric properties of insulating oils
  • Oxidation stability of insulating oils
  • Chromatographic analysis of gases dissolved in transformer oil
  • Assesment of the remaining life of oil
  • Determination of the degree of possible oil purification
  • Physical and chemical testings of electrically insulating paper
  • Determination of the degree of polymerisation of paper (DP)                          
  • Water content of oil and paper  (KF coulometric titration method)
  • Determination of furan derivatives in transformer oil   by HPLC method
  • Compatibility tests of various materials used in transformer with transformer oil
  • Infrared spectroscopic analysis of oil
  • Testing of rubber sealing materials

Laboratory has the capacity to test the following materials:

  • Mineral oil  for transformers and cables
  • Syntetic and natural esters (vegetable oil)  for transformers
  • Silicone oil  for transformers
  • Electrically  insulating paper and  presspaper
  • Laminated paper and wood
  • Rubber sealing materials
  • Electrically insulating tapes 

KONČAR - Electrical Engineering Institute Inc.
Materials and Technology Department
Fallerovo šetalište 22, 10 002 Zagreb, Croatia
Ante Poleš, dipl. ing.
Phone +385 1 366 7308, fax +385 1 366 7319
Dijana Vrsaljko, Ph.D.
Phone +385 1 365 6294,  fax +385 1 366 7319