DAVID ROBERT SMITH
Engineers in Mckeesport, PA

2003006, Apr 3, 2003

Oct 3, 2001

09/971317

David Smith - McKeesport PA, US
John Moffat - Greenwood SC, US
Thomas Kenny - Pittsburgh PA, US

H02H003/08

361/093200

A network protector relay controls a circuit breaker connected between polyphase feeder and network busses. A circuit samples polyphase circuit breaker current and network voltage to generate digital polyphase current and voltage samples. A microcontroller generates positive sequence current and voltage vectors from the current and voltage samples. A first trip algorithm trips the breaker in response to the positive sequence current vector being in a first trip region of a first trip characteristic with respect to the positive sequence voltage vector. The first trip characteristic is defined by a reverse trip setpoint and a first positive angle. A second trip algorithm trips the breaker in response to the positive sequence current vector being in a second trip region of a second trip characteristic with respect to the positive sequence voltage vector. The second trip characteristic is defined by the reverse trip setpoint and a second negative angle.

4654806, Mar 31, 1987

Mar 30, 1984

6/595074

Thomas D. Poyser - McCandless PA
Randall N. Avery - Franklin Park PA
John W. Bankoske - Murrysville PA
John D. Borst - Jefferson City MO
Clive W. Kimblin - Churchill Boro. PA
Albert H. Maxwell - Raleigh NC
David W. McElroy - Upper St. Clair PA
Charles A. Peterson - Van Buran Township, Grant County IN
Joseph R. Rostron - Murrysville PA
David R. Smith - McKeesport PA
William H. South - McKeesport PA
Michael W. Thomas - Marshall Township, Butler County PA

Westinghouse Electric Corp. - Pittsburgh PA

H02H 704, G01R 3102, G08B 2100

364551

A microprocessor-based transformer monitoring system to provide continuous on-line monitoring and analysis of transformer operation. The transformer monitoring system periodically monitors various parameters related to transformer load and condition. Maximum, minimum, and instantaneous values of the parameters are stored and analzyed. To perform the analysis, a hierarchy of thresholds is associated with each parameter. When a parameter exceeds any one of the thresholds, a response is produced by the transformer monitoring system. The type of response depends on the level of the exceeded threshold in the hierarchy. The range of response produced by the transformer monitoring system includes: continuing normal periodic data collection and analysis, increasing the rate of data collection and analysis, recommending an on-site physical check of the monitored transformer, reducing transformer load, and taking the transformer off line.

5682100, Oct 28, 1997

Sep 6, 1995

8/524033

John F. Rossi - Mendham NJ
Michael H. Silverberg - Livingston NJ
Garrett S. Sylvester - Mountain Lakes NJ
Jack F. Trezza - Hopatcong NJ
David Robert Smith - McKeesport PA

Electric Power Research Institute Inc. - Palo Alto CA

G01R 3108

324535

There is provided a system and method for locating faults in power distribution systems with complex topology, such as multi-phase urban networks (6), utilizing reliable time-delay techniques as well as a transponder (22) at a monitoring point to sense the arrival of the transient fault pulse and for transmitting a timing pulse a known time delay after sensing the arrival of the transient fault pulse and a calibration pulse a known time delay after transmitting the timing pulse. Installed along the power distribution system at key locations are receiver stations (4, 4a, 4b) capable of sensing the arrival of the transient fault pulse, timing pulse and calibration pulse and measuring the time intervals occurring between each. The location of the fault is then determined based on these timing intervals, known time delays and the known propagation velocity of the electric power cables in the power distribution system. Fault location accuracy is further enhanced by factoring rise-time effects of the sensed pulses into the time interval measurements.

3947728, Mar 30, 1976

May 23, 1974

5/472773

David R. Smith - McKeesport PA

Westinghouse Electric Corporation - Pittsburgh PA

H02h 336, H02h 326

317 47

A network protector relay having trip characteristics which respond not only to the direction of the flow of positive-sequence power through the breaker outwardly of the network but which will respond to unbalanced and simultaneous faults in the feeder network as well. The network protector relay in addition to its tripping characteristics includes closing characteristics which will permit the automatic closing of a breaker only when the phase sequence of the feeder is the same as that of the network, there is a proper phase relationship between the network and feeder and the magnitude of the feeder voltage is such that power flow will be in a direction toward the network.

4293886, Oct 6, 1981

Dec 17, 1979

6/104647

Larry L. Church - Washington Township, Armstrong County PA
David R. Smith - McKeesport PA
Shan C. Sun - Bell Township, Indiana County PA

Westinghouse Electric Corp. - Pittsburgh PA

H02H 326

361 71

A network protector relay produces a close signal entirely from sequence components based on the magnitude and phase relationships between the positive sequence component of the phase-to-ground voltages on the network side of the protector and the positive sequence component of the phasing voltages. The close signal may be inhibited by either the presence of the negative sequence component of the phase-to-ground voltages on the network side of the protector or if a trip contact is closed. The trip contact will be closed under certain specified conditions which make it advantageous to prevent manual closing of the contacts.