repair of power transformers

[thameem.ms]

These are the test doing after repair of power transformers to know reliability

insulation resistance (core and structure-core);
polarity, phase angle displacement and phase sequence;
voltage ratio;
winding ohmic resistance;
windings and core insulation resistance measurements (Megger test);
windings insulation power factor and capacitances;
condensing bushings capacitances and power factors;
no-load losses and excitation current at 90%, 100% and 110% of rated voltage (AC separate
source);
load losses with reduced current (separate AC source); and

short-circuit impedances.
In some cases, special on-site tests are also performed, namely:
frequency response (FRA);
infrared-scan; and
acoustic emission and partial discharge location; and
insulation characterization through RVM or dielectric spectrography.

i cant see any reports of repair of power transformers
but its similar topics and check it please ..

[rahulr88]

hi
i m a B.tech electrical and electronics engineering student.
i need a report on the the topic "repair of power transformers"

[koolkam]

thank you for information..but i need the information about the repair part.