1
Eric A Udren: Regenerator for an intrabundle power-line communication system. Westinghouse Electric, D R Lackey, October 2, 1984: US04475209 (176 worldwide citation)

A regenerator for providing detection, remodulation, and retransmission of a digital data signal propagated in the differential mode over a pair of bundle conductors of a power line. The electric power signal, propagated in the common mode over the same bundle conductors, is conducted through the re ...


2
Eric A Udren: Power-line baseband communication system. Westinghouse Electric, D R Lackey, September 11, 1984: US04471399 (105 worldwide citation)

A communication system for transmitting baseband digital signals on an electrical power line. A pulse generator produces digital signals which are limited to a frequency spectrum of 30 kHz to 300 kHz and applied directly, i.e., without modulation, to an electrical power line. At the receiving termin ...


3
Eric A Udren: Power bus fault detection and protection system. Electric Power Research Institute, Flehr Hohbach Test Albritton & Herbert, August 29, 1989: US04862308 (31 worldwide citation)

A power bus fault detector for detecting faults in a predefined portion of an electrical power bus having at least one phase. Power feed lines are coupled to the predefined portion of the power bus by circuit breakers. Current transformers are used to detect the current flowing through each phase of ...


4
Eric A Udren: Protective relay methods and apparatus. Electric Power Research Institute, D R Lackey, August 30, 1983: US04402028 (28 worldwide citation)

Differential protective relay methods and apparatus which include a differential current function supervised by both a harmonic restraint function and a voltage change function. The voltage change function determines whether or not the differential current function requires harmonic restraint superv ...


5
Eric A Udren: Relay for pilot protection of electrical power lines. Westinghouse Electric, William E Zitelli, July 9, 1985: US04528611 (24 worldwide citation)

New logic circuitry for a directional comparison blocking protective relay scheme. A forward-reaching and a reverse-reaching protective relay located at the local and remote terminals of a protected line segment determine whether a fault is internal or external to the protected line segment. To carr ...


6
Eric A Udren: Methods and apparatus for protecting electrical reactors. Electric Power Research Institute, D R Lackey, March 22, 1983: US04377833 (23 worldwide citation)

A method of, and apparatus for, detecting shorted turns in an electrical reactor. The impedance of the reactor, and its rate of change, are monitored. A reduction in impedance which exceeds a predetermined rate of change indicates the impedance change is due to shorted turns, and not to some normal ...


7
Eric A Udren: Nonlinear noise reduction apparatus with memory. Westinghouse Electric, William E Zitelli, July 9, 1985: US04528678 (16 worldwide citation)

A nonlinear noise-blanking circuit with memory. An information signal corrupted by a noise signal is input to the nonlinear noise-blanking circuit. The information signal is blanked during noise impulses and an estimate for the blanked information signal is inserted therein. Various embodiments of t ...


8
Eric A Udren: Protective relaying apparatus for providing fault-resistance correction. Westinghouse Electric, B R Studebaker, June 20, 1989: US04841405 (11 worldwide citation)

Protective relay apparatus for providing a compensated fault impedance measurement for the determination of a better estimate of fault location along a transmission line is disclosed. In a power system network including local and remote generating sources disposed at respective ends of a transmissio ...


9
Eric A Udren: Three-phase time overcurrent detector. Westinghouse Electric, E L Pencoske, December 8, 1981: US04305108 (5 worldwide citation)

A polyphase time overcurrent detector provides a variably delayed control signal wherein the delay is inversely related to both the current magnitude and the number of faulted phases. Current transducers produce input signals representative of the current flowing in each phase of the polyphase syste ...


10
William O Brien, Eric A Udren: System for detecting a falling electric power conductor and related methods. San Diego Gas & Electric Company, Klein O Neill & Singh, August 9, 2016: US09413156 (1 worldwide citation)

Methods and systems for detecting a falling power line in a power transmission or distribution system are described. Electrical measurements at various points in the power distribution system are used to detect changes in a power line indicating that the conductor has broken or become disconnected. ...