Ultrasonic nondestructive detection for defects in epoxy/mica insulation

Author

Hao, Yanpeng ; Wang, Guoli ; Xie, Hengkun

Author_Institution

State Key Lab. of Electr. Insulation for Power Equip., Xi´´an Jiaotong Univ., China

fYear

2001

fDate

2001

Firstpage

677

Lastpage

680

Abstract

The detection and recognition of defects in insulation is a significant investigation for insulation diagnosis. In our laboratory, an ultrasonic testing system has been developed and used for insulation diagnosis of large generators. Using this system with lower frequency transducers, experiments were performed on actual stator bars. The results showed that, the 0.5~1.2 MHz frequency transducers could be used for the manufacturing quality test of stator bars. The 0.5~0.8 MHz transducers are more effective for aging assessment of aged stator bars. They are sensitive to the degradation and the internal mechanical damages of aged stator insulation

Keywords

ageing; composite insulating materials; epoxy insulation; insulation testing; machine insulation; mica; stators; ultrasonic materials testing; ultrasonic transducers; 0.5 to 1.2 MHz; aged stator bars; aged stator insulation; aging assessment; epoxy/mica insulation; insulation diagnosis; internal mechanical damages; lower frequency transducers; stator bars; ultrasonic nondestructive defects detection; ultrasonic testing system; Acoustic propagation; Aging; Dielectrics and electrical insulation; Frequency; Insulation testing; Nondestructive testing; Partial discharges; Stator bars; System testing; Ultrasonic transducers;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulating Materials, 2001. (ISEIM 2001). Proceedings of 2001 International Symposium on

Conference_Location

Himeji

Print_ISBN

4-88686-053-2

Type

conf

DOI

10.1109/ISEIM.2001.973767

Filename

973767