Exploring Possibilities for Characterization of POwer Transformer Insulation by Frequency Response Analysis (FRA)

• This paper explores the possibility for using frequencyresponse analysis (FRA) technique to characterize thequality of transformer insulation. For this purpose, a single-phase and a three-phase lumped parameter circuit models were developed.The single-phase model represents a transformer without a laminated core, whereas the three-phase model represents a real transformer with core. Calculations of frequency dependent circuit parameters are presented and the effects imparted on the frequency response by different loss mechanisms (in insulation, inwindings and in core) are discussed. The simulations are compared with results of measurements on real objects. It is shown that FRA could be used for insulation diagnostics if the measurements were of high enough quality.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Elektroteknik och elektronik -- Annan elektroteknik och elektronik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Electrical Engineering, Electronic Engineering, Information Engineering -- Other Electrical Engineering, Electronic Engineering, Information Engineering (hsv//eng)

Nyckelord

frequency response

Fault diagnosis

power transformer

Publikations- och innehållstyp

art (ämneskategori)

ref (ämneskategori)