Title :
Quality assurance after transformer refurbishment by means of polarisation depolarisation currents analysis
Author :
Bhumiwat, Supatra A. ; Stattmann, Peter
Author_Institution :
KEA Consultant, Auckland, New Zealand
Abstract :
This work presents the result of polarisation depolarisation currents (PDC) analysis on two identical 10 MVA, 132/66-33/11 kV, 3φ separate-winding transformers after on-site refurbishment. It intends to show the achievement of the process in the form of dielectric properties evaluated by this new diagnostic tool. The paper demonstrates how the quality of oil and paper between each pair of windings can be assured by the technique.
Keywords :
capacitance; dielectric polarisation; electric current measurement; insulation testing; power transformer insulation; transformer oil; transformer windings; 10 MVA; 11 kV; 132 kV; 66 to 33 kV; capacitance; dielectric properties; dissipation factor; insulation resistance; oil conductivity; oil quality; paper quality; polarisation depolarisation current analysis; polarisation index; quality assurance; recovery voltage; transformer refurbishment; winding transformers; Conductivity; Current measurement; Moisture; Oil insulation; Optical polarization; Petroleum; Power transformer insulation; Quality assurance; Substations; Testing;
Conference_Titel :
Power Tech Conference Proceedings, 2003 IEEE Bologna
Print_ISBN :
0-7803-7967-5
DOI :
10.1109/PTC.2003.1304325
