- Core insulation tests

- Operational checks on protection system

- Insulation resistance (IR) measurement

- Capacitance and dissipation factor 

  (tanδ) measurement of bushings.

- Capacitance and dissipation factor 

  (tanδ) measurement of windings

- Turns ratio (Voltage ratio) measurement

- Vector Group and Polarity

- Winding resistance measurement

- Magnetic Balance test

- Floating neutral point measurement

- Measurement of short-circuit impedance

- Exciting / Magnetizing current 

  measurement

- Vibration measurement of oil‐immersed 

  reactor

- Operational check on OLTCs

- Stability of differential, REF of 

  transformer / reactor

  bushing current transformers tests

- Frequency response analysis (FRA) 

  measurement

- Dissolved gas analysis (DGA) of oil 

  sample

- Thermovision infra‐red scanning

- Wiring diagram check

- General equipment inspection

- Insulation resistance measurement

  relay self-test and             

  external communications checks on     

  digital/numerical relays

- Measurement test

- Trip settings test

- Secondary injections

- Primary injection tests

- Protection scheme logic test.

 

- Mechanical Checks and Visual    

  Inspection 

- Insulation Resistance Test 

- Contact Resistance Test 

- High Voltage Test