HARRY GLENN MATHEWS
Engineers in Cary, NC
License number
Pennsylvania PE016480E
Category
Engineers
Type
Professional Engineer
Address
Address
2
Cary, NC 27513
Pennsylvania
Pennsylvania
Professional information
Harmonic Resonance Control And Protection System For Switched Power Factor Control Capacitor Devices
US Patent:
6181113, Jan 30, 2001
Filed:
Jul 29, 1999
Appl. No.:
9/363426
Inventors:
Yi Hu - Cary NC
Le Tang - Cary NC
Harry G. Mathews - Cary NC
Richard E. Tyner - Florence SC
Le Tang - Cary NC
Harry G. Mathews - Cary NC
Richard E. Tyner - Florence SC
Assignee:
ABB Power T&D Company Inc. - Raleigh NC
International Classification:
G05F 300
US Classification:
323209
Abstract:
A method and system for preventing sustained resonance conditions in a power system involves measuring voltage and current samples on a conductor to which a plurality of controlled capacitors are operatively coupled. The measured voltage and/or current is utilized to identify a resonance condition. The method or system determines whether the resonance condition is due to switching of a controlled capacitor and, if so a corrective switching operation is performed after a first time delay. If the resonance condition is determined not to be due to the switching of a capacitor, then a second switching operation, in which a second controlled capacitor is switched after a second time delay, is performed. The second time delay is preferably greater than the first time delay.