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On-site acceptance tests for newly installated equipment are an important approach to judge whether equipment is normal or abnormal after transportation and installation

Trafo Technics has many years of site experience and is fully equiped to perform following tests:



Transformer testing:

  • Insulation resistance test
  • Tan delta - Capacitance up to 12 KV
  • Exciting current
  • Short circuit impedance
  • Zero sequence impedance
  • Turn ratio
  • DC resistance
  • Dynamic OLTC scan
  • Core demagnetization
  • SFRA

CT testing:

  • Insulation resistance test
  • Tan delta - Capacitance
  • Turn ratio
  • CT winding resistance
  • Excitation curve
  • Burden test

Sweep Frequency Response Analysis

Sweep Frequency Response Analysis (SFRA) is a powerful and sensitive method to evaluate the

mechanical integrity of core, windings and clamping structures within power transformers by measuring  

their electrical transfer functions over a wide frequency range.

SFRA is a proven method for frequency measurements. 

With this test, we can measure the condition of the active part of the transformer. Each transformer has its own "fingerprint".

The results can be used to compare after relocation or to be used after malfunction.

Tan Delta - Capacitance

Tan delta (Tan δ, TD) testing, also called dissipation factor or loss angle, is used for measuring the degree of deterioration of shielded MV/HV insulation. 

The results reveal how contaminated or damaged the insulation has become.

Quality measurements on bushings can detect abnormities before they cause failure.

Dynamic OLTC Scan

Instead of testing the resistance of a fix contact this test allows to test the resistance behaviour trough the tapping process of the OLTC.

We can detect malfunctions in an early stage to prevent failure.

Clients using this service