Title :
Interpreting the frequency responses of PD signals for PD location in transformer windings - Normalized correlation method
Author_Institution :
High Voltage Product Technol. Centre (HVPTC), Crompton Greaves Ltd., Mumbai, India
Abstract :
Partial discharge (PD) is the major source of insulation failure in power transformers. PD identification is an important diagnostic tool for the reliable operation of transformers. In this paper, normalization principle is used in correlation method for location of PD pulse. The limitation of normalized correlation method is further improved by using Butterworth band pass filter, standard error and hypothesis t-test which may assist in identifying the salient features of the winding responses due to PD in transformer windings. The experimental studies are performed on 22kV interleaved winding to prove the feasibility of the method.
Keywords :
Butterworth filters; band-pass filters; correlation methods; failure analysis; frequency response; transformer insulation; transformer windings; Butterworth band pass filter; PD location; PD signals; diagnostic tool; frequency responses; hypothesis t-test; insulation failure; normalized correlation method; power transformer; standard error; transformer winding; voltage 22 kV; Insulation; Windings; Correlation method; Insulation failure; PD location; Partial discharge; Transformers; transformer failures;
Conference_Titel :
Properties and Applications of Dielectric Materials (ICPADM), 2012 IEEE 10th International Conference on the
Conference_Location :
Bangalore
Print_ISBN :
978-1-4673-2852-4
DOI :
10.1109/ICPADM.2012.6318908
