HARRY GLENN MATHEWS
Engineers in Cary, NC
License number
Pennsylvania PE016480E
Category
Engineers
Type
Professional Engineer
Address
Address
2
Cary, NC 27513
Pennsylvania
Pennsylvania
Personal information
See more information about HARRY GLENN MATHEWS at radaris.comName
Address
Phone
100 Germaine Ln APT 407, Bethel Park, PA 15102
173 Bellwood Cir, Sunset Beach, NC 28468
211 Silvercliff Trl, Cary, NC 27513
3029 N 21St St, Philadelphia, PA 19132
211 Silvercliff Trl, Cary, NC 27513
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.