Title :
Diagnosis of Onload Tap Changer Contact Degradation by Dynamic Resistance Measurements
Author :
Erbrink, Jur J. ; Gulski, Edward ; Smit, Johan J. ; Seitz, Paul P. ; Quak, B. ; Leich, Rory ; Malewski, Ryszard
Author_Institution :
Delft Univ. of Technol., Delft, Netherlands
Abstract :
Due to different degradation mechanisms, onload tap changers (OLTCs) may contribute to power transformer failures. If offline diagnosis is undertaken during functional checks performed during the service life of OLTC devices, some of the degradation effects can be assessed. This paper addresses an OLTC diagnostic method based on the measurement of dynamic resistance. An experimental investigation of the degraded OLTC contacts was used to identify a number of defects revealed by dynamic resistance measurements.
Keywords :
electric resistance measurement; fault diagnosis; on load tap changers; OLTC devices; OLTC diagnostic method; dynamic resistance measurements; onload tap changer contact degradation; power transformer failures; Contact resistance; Current measurement; Degradation; Electrical resistance measurement; Power transformers; Switches; Windings; Contact resistance; dynamic resistance measurement; dynamic response; onload tap changer; power transformers; selector contacts;
Journal_Title :
Power Delivery, IEEE Transactions on
DOI :
10.1109/TPWRD.2010.2050499
