Title :
A new technique for the detection of defects in HV groundwall insulation of generator stator windings
Author :
Wu, Xinyan ; Xie, Hengkun ; Wu, Songzhen ; Liu, Guangbin
Author_Institution :
State Key Lab. of Electr. Insulation for Power Equipments, Xi´´an Jiaotong Univ., China
Abstract :
Some defects such as voids and cracks often exist in groundwall insulation due to problems associated with technology. This is a big hidden trouble to the generator, and may lead to the breakdown of insulation in the stator windings finally. In this paper a multi-function instrument with digital signal processing system is developed for detecting the defects within groundwall insulation in generator stator windings. When the stator windings are tapped with a vibrator, a sound containing the information of defects is produced, and picked up by using an acoustic transducer, followed by sound signal analysis. The detected results are displayed on a liquid crystal display and printed by a microprinter. Comparing with the conventional detecting methods, the new technique has advantages such as higher resolution, real time display of results and convenience for operation
Keywords :
AC generators; cracks; delamination; electric breakdown; insulation testing; machine insulation; machine testing; partial discharges; stators; voids (solid); HV groundwall insulation; acoustic transducer; cracks; digital signal processing system; generator stator windings; insulation breakdown; multi-function instrument; sound signal analysis; voids; Acoustic signal detection; Acoustic transducers; Digital signal processing; Electric breakdown; Instruments; Insulation; Liquid crystal displays; Signal analysis; Signal generators; Stator windings;
Conference_Titel :
Electrical Insulation, 1994., Conference Record of the 1994 IEEE International Symposium on
Conference_Location :
Pittsburgh, PA
Print_ISBN :
0-7803-1942-7
DOI :
10.1109/ELINSL.1994.401451
