THOMAS CLINTON STITT
Pilots at Airport Rd, Kittanning, PA
License number
Pennsylvania A1836094
Issued Date
Jun 2015
Expiration Date
Jun 2017
Category
Airmen
Type
Authorized Aircraft Instructor
Address
Address
191 Airport Rd, Kittanning, PA 16201
Professional information
Ground Circuit Impedance Measurement Apparatus And Method
US Patent:
7068040, Jun 27, 2006
Filed:
Aug 13, 2003
Appl. No.:
10/640596
Inventors:
Thomas C. Stitt - Kittanning PA, US
International Classification:
G01R 31/08
US Classification:
324525, 324509, 324508, 324649
Abstract:
Novel ground circuit impedance measurement apparatus and method accurately measure ground circuit impedance. A ground circuit and electrical current source of 25 amperes or less simulate a ground fault. Ground impedance is determined by dividing voltage drop by amperage to determine impedance directly. In one aspect, impedance is determined and displayed automatically. Power wires transmit voltage and current data for the circuit being measured. The cable itself serves as a current-carrying and voltage-transmitting conduit to determine directly the circuit impedance. The novel ground circuit impedance device and method measure impedance in underground mine power systems connecting to an outside electrical power substation outside the mine and using portable transformers in the mine. In one aspect, ground circuit impedance is measured automatically in cables over 1 mile long.
Ground Circuit Impedance Measurement
US Patent:
7323880, Jan 29, 2008
Filed:
Jun 9, 2006
Appl. No.:
11/450168
Inventors:
Thomas C. Stitt - Kittanning PA, US
International Classification:
G01R 31/08
US Classification:
324525, 324509, 324508, 324649
Abstract:
Novel apparatus and method accurately measure ground circuit impedance. A ground circuit and electrical current source adjusted to 25 amperes or less simulate a ground fault. Ground impedance is determined by dividing voltage drop by amperage to determine impedance directly. In one aspect, impedance is determined and displayed automatically. Power wires of the circuit being measured serve as a means for transmitting voltage and current data. The cable itself serves as a current-carrying and voltage-transmitting conduit to determine directly the circuit impedance. The novel ground circuit impedance device and method measure impedance in underground mine power systems connecting to an outside electrical power substation outside the mine and using portable transformers in the mine. The novel ground circuit impedance device and method also measure impedance in above-ground applications involving very long electrical power circuits such as those used to supply power to long conveyors and other electrical power equipment found in Metal/Non-Metal mines, including limestone quarries, sand and gravel operations, and other surface mines. In one aspect, ground circuit impedance is measured automatically in cables over 1 mile long.