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...Daniel Webster invented a "bull plow" to pull out tree stumps. It didn't catch on because it was huge and required four oxen to pull it!
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| Number | Title | Issue Date |
| 8045307 | Faulted phase decision method between current and voltage based delta phase selectors A method of identifying fault conditions in a three phase power system includes monitoring the changes of both the current and voltage properties on a three phase power network. A maximum phase change value of both the current and voltage is determined. Either the v... | 10/25/2011 |
| 7755872 | System, method and device to preserve protection communication active during a bypass operation Provided is an intelligent electronic device for protection, monitoring, controlling, metering or automation of electrical power system. The system, method and device of the present invention preserves current differential protection active during a breaker bypass o... | 07/13/2010 |
| 7457088 | Systems and methods for protection of electrical networks A system and method for accomplishing power swing blocking and unstable power swing tripping schemes during disturbances of electrical networks is disclosed. The disclosed system and method eliminates the requirement of stability studies. The no-setting scheme utili... | 11/25/2008 |
| 7345863 | Apparatus and method for identifying a loss of a current transformer signal in a power system Provided is an apparatus and method for identifying a specific lost current transformer (CT) signal of number of CT signals provided by a corresponding number of CTs coupling a protective device to at least one protection zone. The method includes selectively provid... | 03/18/2008 |
| 7345862 | Protective relay for power systems having fault distance measurement filter logic The system is used in a distance-type protective relay which includes a calculation circuit responsive to voltage and current values from a power line to produce a quantity which is analogous to the distance between the relay and a fault on the line, referred to as ... | 03/18/2008 |
| 7317599 | Multifactor adaptive auto-reclosing of high voltage transmission lines One embodiment of the invention provides a method, system, and device for the auto-reclosing a faulted power transmission line by measuring the characteristics of voltage on a faulted line to determine, in real-time, the moment that the secondary arc is extinguished... | 01/08/2008 |
| 7299143 | Method and apparatus for improving operational reliability during a loss of a phase voltage The present invention is directed to a method and apparatus for improving operational reliability during a loss of a phase voltage (LOV) in a multi-phase power system, wherein a voltage representative of the LOV phase is calculated. The representative voltage is use... | 11/20/2007 |
| 7253640 | Arc fault detector and method for locating an arc fault A circuit breaker for locating an arc fault for a protected circuit includes separable contacts interrupting the protected circuit and an arc fault detector determining an arc fault in the protected circuit. An analog to digital converter circuit measures a value of... | 08/07/2007 |
| 7233470 | Distance relay apparatus A distance relay apparatus includes a directional relay element which performs computation to detect a fault, which occurs in the forward direction from an installing point of the relay apparatus, based on a voltage and a current which are received from an object to... | 06/19/2007 |
| 7221142 | Measuring devices A combined toroid/shunt device for detecting residual current in an electrical installation comprising a plurality of conductors such as a live conductor (2) and a neutral conductor (3) is described. The device comprises a toroid means (1, 4) fo... | 05/22/2007 |
| 7215519 | Ground and line fault interrupt controller/adapter An adapter module for detecting an electronic fault condition in an electronic circuit is disclosed wherein the adapter module may include electrical fault indicator circuitry. In general, the electrical fault indicator circuitry may include ground fault indicator c... | 05/08/2007 |
| 7199989 | Digital protection relay with time sync function In a digital protection relay with a time sync function, the sampling timing of which is specified based on a reference timing transmitted from a time signal generator to a time sync unit, with a determination value. The time sync unit includes a reception circuit t... | 04/03/2007 |
| 7180300 | System and method of locating ground fault in electrical power distribution system A method for locating a ground fault in an electrical power distribution system includes providing a plurality of current sensors at a plurality of locations in the electrical power distribution system. The method further includes detecting a ground fault in the ele... | 02/20/2007 |
| 7154722 | Loop control for distribution systems The invention contemplates a technique for providing loop control on a faulted overhead or underground loop system, while preventing restored current from being fed or back fed into the fault. In particular, the invention provides a method, device, and system for re... | 12/26/2006 |
| 7106565 | Directional ground relay system A directional ground relay (50) for receiving electric values relating to voltage and current from a power transmission line (1) to be protected. The directional ground relay may decide a direction of a fault in the power transmission line based upon t... | 09/12/2006 |
| 7102866 | Power line protection A protection system for an electrical power line system of the type comprising radially connected power line sections, wherein a first electrically upstream one of the line sections is connectable to a power source. The protection system comprises at least one relay... | 09/05/2006 |
| 7085938 | Protective relay with embedded web server A protective relay having an embedded web server to allow communication with a remote device having a standard web browser package. The relay can receive and transmit HTML files according to the HTTP protocol over a communications network. The relay can receive comm... | 08/01/2006 |
| 7053626 | Device and method for monitoring the connection of an electrical supply unit The invention relates to a device and a method for monitoring the connection of an electrical supply unit comprising voltage detection (32) detecting phase voltage (14), current detection (32) detecting phase voltages (38), a transformati... | 05/30/2006 |
| 7050913 | Method and apparatus for monitoring power quality in an electric power distribution system A composite power quality indication generated from user weighted statistical contributions of selected system parameters provides an overall indication of power quality in an electric power distribution system. The user defined weightings are maintained over time b... | 05/23/2006 |
| 6989977 | Digital directional relay A digital directional relay converts a voltage value and a current value of a power system into digital voltage data and digital current data by periodic sampling and determines a direction of a fault using the digital voltage data and the digital current data. In t... | 01/24/2006 |
| 6944554 | Method for detecting fault on transmission lines by using harmonics and state transition diagram Disclosed is a method for detecting a fault by using harmonics and a state transition diagram. When the fault occurs on transmission lines, the fault is detected by using harmonics and the state transition diagram. Two logic signals are outputted by using apparent i... | 09/13/2005 |
| 6924647 | Fault location method and device The present invention relates to a method for calculating the distance to fault in a section of a power transmission network, which section is arranged with line terminals at both ends, each terminal including impedance relays (AA, BB), including the steps of, at th... | 08/02/2005 |
| 6879917 | Double-ended distance-to-fault location system using time-synchronized positive-or negative-sequence quantities When a disturbance (for example, lightning strike) occurs on a high-voltage overhead transmission line, the line must be checked for any possible damage. If the distance-to-fault is known, line crews can be quickly dispatched for any necessary repair. The present in... | 04/12/2005 |
| 6873508 | Protective relay system In a protective relay system according to an aspect of the present invention, a direction of a fault is correctly determined during system oscillation using one of a negative-phase-sequence relay and a zero-phase-sequence relay. A circuit breaker is tripped only whe... | 03/29/2005 |
| 6833711 | Protective relay for powers systems having dependable out-of-step blocking capability The apparatus detects an out-of-step condition following the clearing of an external multi-phase fault in a protective relay. The apparatus includes a circuit which detects the presence of an external multi-phase fault on the power line and a timing circuit for read... | 12/21/2004 |
| 6829544 | Line current differential protective relaying method and relay for in-zone tapped transformers A line current differential protective relay and method for protecting transmission lines with power transformers tapped between the substations without any measurements taken at the tap point. The protection method uses distance supervision by an overcharging insta... | 12/07/2004 |
| 6760670 | Crossover fault classification for power lines with parallel circuits The invention describes a method, system, device, and computer-readable medium having computer-executable instructions for classifying faults on an electrical power line. In particular, the invention permits the classification of crossover faults using a local measu... | 07/06/2004 |
| 6741943 | Crossover fault classification for power lines with parallel circuits The invention describes a method, system, device, and computer-readable medium having computer-executable instructions for classifying faults on an electrical power line. In particular, the invention permits the classification of crossover faults, using a local meas... | 05/25/2004 |
| 6738719 | Crossover fault classification for power lines with parallel circuits The invention describes a method, system, device, and computer-readable medium having computer-executable instructions for classifying faults on an electrical power line. In particular, the invention permits the classification of crossover faults, using a local meas... | 05/18/2004 |
| 6661630 | Distance relay for protection of transmission line having minimized reactance effect A distance relay for protection of a transmission line, which is capable of estimating apparent impedances with respect to faults on the transmission line involving fault resistances, more particularly faults at local and remote ends of a protection zone ... | 12/09/2003 |
| 6633166 | Method for generating an error signal identifying a short circuit The invention is directed to a method for producing a fault signal indicating a short-circuit between a first phase conductor and a second phase conductor of two different, parallel-running, three-phase power transmission lines. The method produces a faul... | 10/14/2003 |
| 6518767 | Line differential protection system for a power transmission line In a power line current differential protection system, all three phase current values (IA, IB and IC) are obtained from both the local end and the remote end of a power transmission line. The magnitude of the ratio of the... | 02/11/2003 |
| 6498709 | Digital distance relay A digital distance relay for deciding whether a fault point is within a stipulated operation region by obtaining an impedance to the fault point. The relay comprises: means for deciding whether the impedance is within a specified region by applying a valu... | 12/24/2002 |
| 6483435 | Method and device of fault location for distribution networks The present invention relates to a method for location of a fault which has occurred on one of a plurality of lines in a power distribution network where the location is performed with the measured values of the common supply voltage of the plurality of l... | 11/19/2002 |
| 6469629 | Distributed logic in multiple protective relays A protective relay, system, and relay operation method which allows logic functions to be distributed amongst multiple protective relays associated with a power distribution system. The protective relays include communications ports for exchanging message... | 10/22/2002 |
| 6459960 | Distance relay equipment A short-circuit distance relay has a short-circuit distance relay element that calculates a fault impedance from voltage and current which are introduced from a power system and that compares the fault impedance with a set impedance and uses the fault imp... | 10/01/2002 |
| 6426856 | Method for monitoring a protective gear A method of operating a protective gear is described, in particular a remote protective gear for an electric power grid. In this method, a voltage signal is derived from the line voltage, and a current signal is derived from the line current. To guarantee... | 07/30/2002 |
| 6397155 | Method and apparatus for automatically controlled gain switching of monitors A method and apparatus for automatically controlling gain switching of a monitor. To automatically control gain switching, an electronic circuit splits an input channel into a plurality of gain channels. The plurality of gain channels are simultaneously s... | 05/28/2002 |
| 6392857 | Device and process for protecting a line of a network of electricity supply lines This device for protecting a line (10, 12) of a network of supply lines comprises two protective relays (18, 20; 22, 24) furnished with means for detecting faults and a circuit breaker adapted so as to disconnect the line from the network of lines in the ... | 05/21/2002 |
| 6385022 | Method and apparatus for deriving power system data from configurable source points A protective relay that derives and processes power system data from multiple user-configurable data source points. Data from multiple source points can be combined in the relay as a single source of data useful to perform a wide variety of monitoring and... | 05/07/2002 |
