Introduction to Methods
The methods used during tests and measurements of the Power Transformers, test and measurement circuits, calculations and evaluation criteria are included in this manual. At the end of this manual, BEST Balıkesir Transformer Factory laboratory hardware and measurement and test equipment are listed.
!!! For insulation levels of transformers, electrical characteristics and evaluation, please refer to national and international standards and customer specifications.
Tests and evaluation definitions are listed below:
Routine tests are performed during manufacturing on all transformers after the active part assembly is completed and according to TS 267, IEC 76 etc.
Measurement of winding resistance
Measurement of voltage ratio and check of phase displacement
Measurement of short-circuit impedance and load loss
Measurement of no-load loss and current
Separate source AC withstand voltage test
Induced AC voltage test
Tests on on-load tap-changers
Type tests are performed upon customer request.
Special tests are performed upon customer request.
Switching impulse voltage test
Measurement of dissipation factor (tanδ) and capacitance
Measurement of zero sequence impedance(s)
Determination of the sound level
Measurement of harmonics of the no-load current
Measurement of insulation resistance
Tests performed on power transformers can be generally classified as follows: Tests during manufacturing, routine tests, type tests, special tests, acceptance tests, site tests, defect analysis/identification and tests before maintenance.