2 Winding Transformer Long

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Transformer Introduction















Why Do We Test?















Firefighters to the Rescue















The Final Product

















Transformer Winding Configurations

















Transformer Tests

















Transformer Identification Panel



























































































Free Breather Tank Transformer



















Sealed Tank Transformer



















Gas (Nitrogen) Blanketed Tank Transformer Automatic Gas Seal System









































































































































































































Transformer Overall Tests Recommended Doble Power-Factor Test Voltages for Liquid-Filled Type Power and Distribution Transformers Tested in the Absence Of Insulating Fluid and Under Atmospheric or Greater Absolute Pressure • Low test voltage is sufficient to assess the general level of dryness of a transformer insulation system • Maintain adequate clearance between all















Transformer Overall Tests Recommended Doble Power-Factor Test Voltages for Liquid-Filled Type Power and Distribution Transformers Tested in the Absence Of Insulating Fluid and Under Atmospheric or Greater Absolute Pressure • Do not apply test voltages that exceed those recommended for transformers with the insulating fluid removed















Transformer Overall Tests Recommended Doble Power-Factor Test Voltages for Liquid-Filled Type Power and Distribution Transformers Tested in the Absence Of Insulating Fluid and Under Atmospheric or Greater Absolute Pressure Transformer Winding Rating L-L (kV) (kV)

Test Voltage

Delta Windings Windings 161

d Ab

10















Transformer Overall Tests Recommended Doble Power-Factor Test Voltages for Liquid-Filled Type Power and Distribution Transformers Tested in the Absence Of Insulating Fluid and Under Atmospheric or Greater Absolute Pressure Transformer Winding Rating L-L (kV)

Test Voltage (kV

Wye Windings and Single Phase w/ Neutral















Transformer Overall Tests Recommended Doble Power-Factor Test Voltages for Dry-Type Power and Distribution Transformers Transformer Winding Rating L-L (kV) Test Voltages (kV) Delta and ungrounded Wye Windings Above 14.4 2 and 10 12 to 14.4 2, L-to-G, 10 5.04 to 8.72 2 and 5 2.4 to 4.8 2

















Two-Winding Transformer Test Procedure HV Cable

High

Low

Tank & Core

















Test No. 1: Measure CH + CHL ICHL HV Cable

High

Low

ICH Tank & Core

















Test No. 2: Measure CH ICHL HV Cable

High

Low

ICH Tank & Core

















Test No. 3: Measure CHL ICHL HV Cable

High

Low

ICH Tank & Core

















Test Summary and Calculated CHL



















Two-Winding Transformer Test Procedure



















Test No. 5: Measure CL + CHL



















Test No. 6: Measure CL



















Test No. 7: Measure CHL



















Test Summary and Calculated CHL























































































































































2 Winding Transformer Long

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