Transformer Oils Testing and Analysis

SOCOTEC have many years' experience in the analysis of electrical transformer oils for power generators, distributors and end users.

SOCOTEC's laboratories offer a comprehensive analysis of electrical insulation and transformer oils in relation to dissolved gas content and physical properties, which allow the condition of the equipment to be monitored and potential failures corrected. We also provide analysis of oils for the presence of Furfuraldehydes (FFA) and Polychlorinated Biphenyls (PCB) in any insulation oils.

  • Faults within transformers based on the nature of the gas content of the oil sample
  • If oil has become contaminated with a material that can reduce its insulating properties and requires changing to prevent reduction in effectiveness


  • Identify potential component failure
  • Assess oil condition and identify need for oil change based on condition rather periodicity
  • Investigate reasons for component failure
  • Review maintenance schedules and extend maintenance periodicity


  • 24/7 access to a web based reporting and management system that allows multiple-user customers access to review results, identify trends and plan maintenance activities
  • Provision of sampling kits, which includes such items as bottles, labels and transportation cases or pre-paid posting tubes to return samples to the laboratory
  • Courier collection of samples
  • Fast turn round and reporting of results
  • Expert interpretation of results, in order to detect trends and provide critical advice to customers before problems arise.
  • Technical support and consultancy


These enable customers to provide cost effective maintenance and improved in- service performance.