Patents by Inventor Eric A. Udren

Eric A. Udren has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 10153635
    Abstract: 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. Upon detection, control mechanisms are used to deenergize the conductor while the conductor is falling and/or before it contacts the ground.
    Type: Grant
    Filed: July 18, 2016
    Date of Patent: December 11, 2018
    Assignee: San Diego Gas & Electric Company
    Inventors: William O'Brien, Eric A. Udren
  • Publication number: 20160329700
    Abstract: 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. Upon detection, control mechanisms are used to deenergize the conductor while the conductor is falling and/or before it contacts the ground.
    Type: Application
    Filed: July 18, 2016
    Publication date: November 10, 2016
    Applicant: San Diego Gas & Electric Company
    Inventors: William O'Brien, Eric A. Udren
  • Patent number: 9413156
    Abstract: 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. Upon detection, control mechanisms are used to deenergize the conductor while the conductor is falling and/or before it contacts the ground.
    Type: Grant
    Filed: July 26, 2013
    Date of Patent: August 9, 2016
    Assignee: San Diego Gas & Electric Company
    Inventors: William O'Brien, Eric A. Udren
  • Publication number: 20140028116
    Abstract: 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. Upon detection, control mechanisms are used to deenergize the conductor while the conductor is falling and/or before it contacts the ground.
    Type: Application
    Filed: July 26, 2013
    Publication date: January 30, 2014
    Applicant: SAN DIEGO GAS & ELECTRIC COMPANY
    Inventors: William O'Brien, Eric A. Udren
  • Publication number: 20030223167
    Abstract: A distributed bus differential relay system has a separate differential relay element at each feeder location to trip the associated circuit breaker in response to a fault in the protected bus. The only conductors between feeders form a set of leads connecting current transformers in each of the feeders in parallel. Preferably, the current transformer in each feeder also serves as the current transformer for the associated circuit breaker and the differential relay element is incorporated into the overcurrent relay or trip unit of the circuit breaker which is implemented by a microprocessor. Compliance voltage across the cts is limited by a varistor or saturating reactor which is protected from overheating by a time delayed shorting device.
    Type: Application
    Filed: December 22, 2000
    Publication date: December 4, 2003
    Inventor: Eric A. Udren
  • Patent number: 5838525
    Abstract: A protective relaying system includes a local protective relay operatively coupled to a protected line segment at a first location, and a remote protective relay operatively coupled to the protected line segment at a second location. The remote protective relay generates a signal (PILOT RECEIVE) to indicate the detection of a fault. This signal is communicated to the local protective relay and employed therein to supervise single-pole trip operations.
    Type: Grant
    Filed: April 15, 1997
    Date of Patent: November 17, 1998
    Assignee: ABB Power T&D Company, Inc.
    Inventors: Solveig Ward, Eric Udren
  • Patent number: 5796629
    Abstract: Disclosed is a protective relaying system that trips a local circuit breaker (BL) connected to a transmission line by providing a trip signal ("TRIP.sub.-- BL") to the circuit breaker. The system comprises a local filter operatively coupled to the transmission line, and a local relay operatively coupled to the filter. The local filter receives inputs indicative of phase currents on the transmission line and provides an output ("VFL.sub.k ") derived from the inputs. The local relay (1) receives the output (VFL.sub.k) of the local filter, (2) receives an output ("VFR1.sub.k ", "VFR2.sub.k ") of at least one remote filter, and (3) generates the trip signal. The local filter and relay preferably employ substantially all digital electronic circuitry to generate the trip signal.
    Type: Grant
    Filed: December 18, 1995
    Date of Patent: August 18, 1998
    Assignee: ABB Power T&D Company, Inc.
    Inventors: Fernando Calero, Eric Udren
  • Patent number: 4862308
    Abstract: 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 each power feed line which is coupled to the predefined portion of the power bus. A summer generates a current differential signal for each phase that is equal to the sum of the currents detected by the current transformers. A fault detector generates a trip signal which causes the feed line circuit breakers to disconnect the feed lines from the power bus when a fault is detected in the predefined portion of the power bus. The fault detector includes a detector which detects when the current differential signal in any of the power bus's phases is substantially nonsinusoidal in shape.
    Type: Grant
    Filed: May 1, 1987
    Date of Patent: August 29, 1989
    Assignee: Electric Power Research Institute, Inc.
    Inventor: Eric A. Udren
  • Patent number: 4841405
    Abstract: 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 transmission line segment of the transmission line, the protective relay apparatus is disposed at the local end of the line segment to measure the fault impedance for use in determining fault location. However, load flow conditions rendered by the generating sources interact with a fault which contributes resistance substantially to the fault impedance of the transmission line to cause an erroneous component in the fault impedance measurement rendering the determination of an erroneous fault location.
    Type: Grant
    Filed: March 6, 1985
    Date of Patent: June 20, 1989
    Assignee: Westinghouse Electric Corp.
    Inventor: Eric A. Udren
  • Patent number: 4528611
    Abstract: 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 carry out this function, the protective relays produce signals representative of fault location and communicate with each other via a communications channel. A fault detector and logic circuitry is provided at each terminal for processing the produced signals to determine the fault location and avoid tripping when the fault character changes. By using fault detectors to determine the existence of a fault, the logic at each terminal for combining the signals is simplified and security against false tripping is improved.
    Type: Grant
    Filed: February 22, 1983
    Date of Patent: July 9, 1985
    Assignee: Westinghouse Electric Corp.
    Inventor: Eric A. Udren
  • Patent number: 4528678
    Abstract: 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 the invention disclose means for determining an appropriate estimate. For example, the estimate can be a simple positive or negative dc value corresponding to the sign of the information signal prior to noise corruption. Alternatively the first and second derivatives of the information signal prior to noise corruption can be used to generate an expected future trajectory of the information signal, and this value inserted in the information signal during the blanked interval. Also, a sample and hold circuit can be used to "remember" the value of the information signal prior to the inception of a noise impulse. This "remembered" value is then inserted in the information signal during the blanked interval.
    Type: Grant
    Filed: July 5, 1983
    Date of Patent: July 9, 1985
    Assignee: Westinghouse Electric Corp.
    Inventor: Eric A. Udren
  • Patent number: 4475209
    Abstract: 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 regenerator and provides a power supply voltage for the regenerator electronics. A series of electrical traps prevent the electric power signal from being conducted into that portion of the regenerator utilized for processing of the data signal. The regenerator also includes bypass switches for by-passing the regenerator electronics when a power supply voltage sufficient to operate the electronics is unavailable.
    Type: Grant
    Filed: April 23, 1982
    Date of Patent: October 2, 1984
    Assignee: Westinghouse Electric Corp.
    Inventor: Eric A. Udren
  • Patent number: 4471399
    Abstract: 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 terminal an amplifier compensates for attenuation characteristics of the electrical power line and the received signal is then sampled to extract the information from it. To avoid interference when both a transmitting and receiving link are located at a substation, the baseband system incorporates a mimic network to mimic the interference signal erroneously picked up by the receiving link from the transmitting link located at the same substation. The mimic signal is then subtracted from the interference signal to neutralize the effect of the latter.
    Type: Grant
    Filed: March 11, 1982
    Date of Patent: September 11, 1984
    Assignee: Westinghouse Electric Corp.
    Inventor: Eric A. Udren
  • Patent number: 4402028
    Abstract: 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 supervision, preempting such supervision when it is not required, to enable faster trip decisions to be made by the differential current function.
    Type: Grant
    Filed: August 17, 1981
    Date of Patent: August 30, 1983
    Assignee: Electric Power Research Institute, Inc.
    Inventor: Eric A. Udren
  • Patent number: 4377833
    Abstract: 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 cause, such as temperature.
    Type: Grant
    Filed: August 17, 1981
    Date of Patent: March 22, 1983
    Assignee: Electric Power Research Institute, Inc.
    Inventor: Eric A. Udren
  • Patent number: 4305108
    Abstract: 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 system. The input signals are added together to produce a charging signal. If at the end of a predetermined time period the fault has not been cleared, the charging signal will begin to charge a capacitor. If the capacitor charges to a predetermined voltage level within a fixed time period, the control signal is initiated.
    Type: Grant
    Filed: September 21, 1979
    Date of Patent: December 8, 1981
    Assignee: Westinghouse Electric Corp.
    Inventor: Eric A. Udren