Multiple re-strikes phenomenon when using vacuum circuit breakers to start refiner motors

Author

Eichenberg, J.P. ; Hennenfent, H. ; Liljestrand, L.

Author_Institution

QUNO Corp., Thorold, Ont., Canada

fYear

1998

fDate

21-26 June 1998

Firstpage

266

Lastpage

273

Abstract

15 kV class vacuum circuit breakers have become the most popular method of starting large chip refiner synchronous motors. Multiple re-strikes, can occur in vacuum circuit breakers and may cause transient overvoltages at the motor terminals. This condition damages motor stator windings. The paper describes multiple re-strikes in vacuum circuit breakers and how they are measured. It also discusses the experience at Avenor´s Canadian pulp and paper mills in Gold River, British Columbia and Thunder Bay, Ontario and at the QUNO mill, Thorold, Ontario, Canada. Included are modifications recommended to protect the refiner motors from further damage.

Keywords

overvoltage protection; paper industry; restriking voltage; starting; stators; synchronous motor protection; vacuum circuit breakers; 15 kV; Avenor; British Columbia; Canada; Gold River; Ontario; QUNO mill; Thorold; Thunder Bay; motor protection; motor terminals; multiple re-strikes phenomenon; pulp and paper mills; refiner motors starting; stator winding damage; synchronous motors; transient overvoltage; vacuum circuit breakers; Circuit breakers; Gold; Milling machines; Paper mills; Protection; Rivers; Semiconductor device measurement; Stator windings; Surges; Synchronous motors;

fLanguage

English

Publisher

ieee

Conference_Titel

Pulp and Paper Industry Technical Conference, 1998. Conference Record of 1998 Annual

Conference_Location

Portland, ME, USA

ISSN

0190-2172

Print_ISBN

0-7803-4785-4

Type

conf

DOI

10.1109/PAPCON.1998.685530

Filename

685530