Development of partial discharge monitor for turbine generators

Author

Itoh, K. ; Tsurimoto, T. ; Kaneda, Y. ; Kitamura, S. ; Kuroki, S. ; Ohsawa, T. ; Tanaka, H.

Author_Institution

Mitsubishi Electr. Corp., Hyogo, Japan

fYear

1998

fDate

27-30 Sep 1998

Firstpage

79

Lastpage

82

Abstract

A new partial discharge (PD) monitor has been developed. It continuously monitors electrical condition of stator winding insulation of the turbine generators in service. Wires of a resistance temperature detector (RTD) preinstalled between top and bottom coils of a stator slot are used as a RF coupler so that no new device installed inside a generator is required. Electromagnetic noise occurring around the generator is rejected by detection with multiple sensors and signal processing software. Results of in-service measurements show negative load and temperature dependence of PD characteristic. It is expected that the dependence is a symptom of degradation of the insulation system

Keywords

insulation testing; interference suppression; machine insulation; machine testing; partial discharge measurement; stators; turbogenerators; RF coupler; electromagnetic noise rejection; multiple sensors; partial discharge monitor; resistance temperature detector; signal processing software; stator winding insulation; turbine generator; Coils; Condition monitoring; Detectors; Dielectrics and electrical insulation; Electric resistance; Partial discharges; Stator windings; Temperature sensors; Turbines; Wires;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulating Materials, 1998. Proceedings of 1998 International Symposium on

Conference_Location

Toyohashi

Print_ISBN

4-88686-050-8

Type

conf

DOI

10.1109/ISEIM.1998.741689

Filename

741689