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Power transformers are critical, capital-intensive assets for utilities and industry. Their failure is unacceptable, because usually severe damage occurs not only to the asset itself but also to the surroundings. Furthermore, also the company’s staff and the public may be endangered by defective transformers.
However, replacing on a time-based principle is not the alternative since the replacement costs for these assets can be enormous. Therefore, testing and diagnosis of power transformers is of utmost importance. OMICRON offers a wide range of test sets for power transformers according to international standards like IEC 60076-1, IEC 60076-3, IEEE Std C57.12.00, IEEE Std C57.12.90.
Conventional Electrical Power Transformer Testing
Conventional tests can detect many critical problems – before they cause bigger damage. OMICRON has developed an extensive range of testing solutions for nearly all purposes.
Dissipation Factor, Power Factor and Capacitance Measurement
Power factor, dissipation factor and capacitance measurements on capacitive bushings are of utmost importance to identify defects in the potential steering electrodes long before they lead to a breakdown of the insulation. OMICRON provides innovative solutions for transformer testing.
Power Transformer Moisture Measurement
Moisture enters transformers from the atmosphere and during installation and repair. Aging of the oil-paper insulation also increases the moisture level. Assessing the water content in insulation is thus a key factor to ensure transformer reliability and longevity. OMICRON's patented method determines the content of water in oil-paper insulations by using the most advanced dielectric measurement technique.
Partial Discharge Measurement and Monitoring
Partial discharge (PD) phenomena often precede an insulation breakdown of high voltage equipment, leading to cost intensive outages and repairs. Mainly natural causes or accelerated aging of the high voltage insulation create a partial discharge scenario, but manufacturing or installation problems can also contribute.
Frequency Response Analysis (FRA)
Frequency Response Analysis (FRA) or Sweep Frequency Response Analysis (SFRA), as it is often referred to, is an innovative, non-intrusive test method which allows the detection of mechanical or electrical changes in a transformer. Winding deformations (axial or radial), displacements between windings, core movement and many other changes can be identified accurately and precisely.