Title :
Analysis and localization of spurious partial discharge activity in generator units
Author :
Pemen, A.J.M. ; van der Laan, P.C.T. ; de Leeuw, W.
Author_Institution :
Group Electr. Power Syst., Eindhoven Univ. of Technol., Netherlands
fDate :
6/23/1905 12:00:00 AM
Abstract :
Partial discharge (PD) measurements are an effective tool to assess the condition of important power plant components, such as the generator, the generator circuit-breaker and the step-up transformer.This paper shows that, in addition to phase-resolved patterns, the waveshapes of PD signals provide valuable information on the type and origin of the discharges. The authors describe the complex propagation of PD signals in a stator winding and the consequences for PD detection. Results from on-line measurements in three power plants where abnormal PD activity was observed are presented. In all cases the source of the PD´s ccan be located: (i) slot discharges in a 125 MW generator, (ii) interphase discharges in the end-windings of a 165 MW generator, and (iii) an improperly installed bleeding resistor in a generator-circuit breaker
Keywords :
AC generators; calibration; circuit breakers; computerised instrumentation; crosstalk; electric machine analysis computing; machine testing; partial discharge measurement; resistors; signal processing; stators; turbogenerators; waveform analysis; 125 MW; 125 MW generator; 165 MW; 165 MW generator; bleeding resistor; end-windings; generator-circuit breaker; interphase discharges; on-line measurements; partial discharge measurements; phase-resolved patterns; slot discharges; stator winding; waveshapes; Circuits; Fault location; Hemorrhaging; Partial discharge measurement; Partial discharges; Phase measurement; Power generation; Power measurement; Signal generators; Stator windings;
Conference_Titel :
Solid Dielectrics, 2001. ICSD '01. Proceedings of the 2001 IEEE 7th International Conference on
Conference_Location :
Eindhoven
Print_ISBN :
0-7803-6352-3
DOI :
10.1109/ICSD.2001.955703
