Title :
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
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;
Conference_Titel :
Pulp and Paper Industry Technical Conference, 1998. Conference Record of 1998 Annual
Conference_Location :
Portland, ME, USA
Print_ISBN :
0-7803-4785-4
DOI :
10.1109/PAPCON.1998.685530
