BRIAN SCOTT ZABRISKIE
Pilots at Highland Dr, Moscow, ID
License number
Idaho A2864239
Issued Date
May 2015
Expiration Date
May 2017
Category
Airmen
Type
Authorized Aircraft Instructor
Address
Address
1227 Highland Dr, Moscow, ID 83843
Professional information
Use Of A Thermal Limit Curve With A Time Overcurrent Curve To Provide Thermal Protection In A Protective Relay
US Patent:
2005007, Apr 14, 2005
Filed:
Oct 10, 2003
Appl. No.:
10/684046
Inventors:
Robert Morris - Viola ID, US
Jacob Reidt - Spokane WA, US
Brian Zabriskie - Moscow ID, US
Carl Mattoon - Pullman WA, US
Jacob Reidt - Spokane WA, US
Brian Zabriskie - Moscow ID, US
Carl Mattoon - Pullman WA, US
International Classification:
H02H003/08
US Classification:
361093100
Abstract:
An overcurrent protective relay includes means for obtaining current values from a power line which are adjusted for application to and use by a processor portion of the relay. The processor evaluates the adjusted power line current values against an overcurrent curve by which, as the current increases from a continuous rating, the time to trip decreases. A thermal limit It curve is combined with the time overcurrent curve, the curves being arranged so that the thermal limit curve crosses over the time overcurrent curve at a selected current value. In such a case, the thermal limit curve controls the time to trip for current fault values above the selected current value and the inverse time overcurrent curve controls the time to trip for fault current values below the selected current value.