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

Volume

2

fYear

2003

fDate

23-26 June 2003

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Tech Conference Proceedings, 2003 IEEE Bologna

Print_ISBN

0-7803-7967-5

Type

conf

DOI

10.1109/PTC.2003.1304325

Filename

1304325