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| Number | Title | Issue Date |
| 7336461 | Method for determining the moment of closure of a circuit breaker on a high voltage line A method for determining the reclose time of a circuit breaker on a three-phase high-voltage electric network after separation of contacts 7A, 8A, 7B, 8B, 7C, 8C in the presence of a fault on one of the three phases A, B or ... | 02/26/2008 |
| 7199991 | Electrical bus protection method & apparatus A protection relay for a power line system that employs current transformers for detecting current on a bus is provided with a fault trip scheme that includes transformer current saturation detection so as to avoid false tripping due to temporary transformer current... | 04/03/2007 |
| 7170730 | Multiple suite audio line isolator A method for isolating suites includes the steps of isolating the suites when an alarm is initiated, setting a timer during isolation creating a window of time to clear a short circuit, clearing said short circuit, removing isolation from the suites as the timer rea... | 01/30/2007 |
| 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 |
| 7126800 | Method and system for communications channel delay asymmetry compensation using global positioning systems A method for compensating for communications channel delay asymmetry in a current differential protection system includes determining an apparent sampling clock offset for a communications channel, the apparent sampling clock offset between a first sampling clock an... | 10/24/2006 |
| 7119459 | Intelligent switch for connecting power to a load A switching circuit includes a microchip which, in response to a signal from a signal switch, controls the operation of a power switch which, when closed, connects a load to a battery. The microchip can monitor the status of the battery and control the power switch ... | 10/10/2006 |
| 7110231 | Adaptive protection system for a power-distribution network A preferred embodiment of a system comprises a recloser electrically coupled to a voltage source of a power-distribution network and adapted to isolate a section of a distribution feeder of the power-distribution network from the voltage source in response to an ove... | 09/19/2006 |
| 7046157 | Short circuit detector for shield conductor in a fieldbus network A short circuit detector for a fieldbus network which includes power/data wires that are typically positive and negative, respectively, and a shield conductor connected to a ground includes first and second high-impedance semiconductor circuits coupled between each ... | 05/16/2006 |
| 7043340 | Protection system for power distribution systems A protection system for a power distribution system is provided. The protection system includes a central computer, a plurality of data modules, and a data network. The data modules are each in communication with a different circuit breaker of the power distribution... | 05/09/2006 |
| 7017072 | Protection circuit for an access-arbitrated bus system network The invention relates to a protection circuit (12) for an access-arbitrated bus system network, comprising a fault detection device for detecting a fault status in a sub-network of the overall bus system network; and a separating device for separating the sub... | 03/21/2006 |
| 6937134 | Reception of protection commands in a remote tripping device In order to receive protection commands in a remote tripping device, one or more signals is or are received, protection commands and combinations of protection commands are coded by means of an individual signal or by means of a predetermined combination of signals,... | 08/30/2005 |
| 6701221 | Method and apparatus for preventing excessive heat generation in a alternator of a generator set A method and apparatus are disclosed for preventing damage to an alternator of a genset resulting from high currents within the alternator. The method includes calculating, at a processor, a first quantity related to a current flowing through the alternat... | 03/02/2004 |
| 6678134 | Digital protective relay system A digital protective relay system is capable of making sampling timing the same among plural protective relay device which operate independent from each other by using a signal from a GPS satellite. The sampling timing is made the same regardless of the t... | 01/13/2004 |
| 6650031 | Protective system for a solar module The invention relates to a system for protecting a solar module against theft or unauthorized use by an authorized consumer. Said system comprises an interruption device on the solar module side and a release device on the consumer side. The interruption ... | 11/18/2003 |
| 6628496 | Protection system for an electricity network having a data transmission radio link The digital protection system for a high voltage electricity network to instruct circuit breakers to open in the event of faults being detected by current and/or voltage sensors on the network lines connected to the circuit breakers includes a radio link ... | 09/30/2003 |
| 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 |
| 6459998 | Sensing downed power lines In systems embodying the invention, a "downed" power line is detected by sensing whether there is an open circuit along the power line and producing an indication that an open circuit condition exists. In response to an indication that an open circuit con... | 10/01/2002 |
| 6356422 | Circuit breaker communication and control system A circuit breaker system 10 (FIG. 1) using electronic trip units 35 is disclosed. The electronic trip units 35 are coupled to a communications bus 30 whereby the electronic trip units 35 can be reconfigured, controlled, and/or monitored by a central compu... | 03/12/2002 |
| 6347027 | Method and apparatus for automated reconfiguration of an electric power distribution system with enhanced protection Method and apparatus for controlling an electric power distribution system including the use and coordination of information conveyed over communications to dynamically modify the protection characteristics of distribution devices (including but not limit... | 02/12/2002 |
| 6297939 | Zone selective interlock for a circuit breaker system A circuit breaker system 10 using electronic trip units 35. The electronic trip units 35 are coupled to a communications bus 30 whereby the electronic trip units 35 can be reconfigured, controlled, and/or monitored by a central computer 20. Further, the e... | 10/02/2001 |
| 6243244 | Method for automated reconfiguration of a distribution system using distributed control logic and communications A system and method which detects and responds to abnormalities in a distribution system by reconfiguring nodes of the system to minimize the effects of the abnormality without the requirement of communicating with a central controller. The nodes in the s... | 06/05/2001 |
| 6212049 | Load center monitor for electrical power lines A load center monitor (10) is disclosed for monitoring and analyzing data gathered by electronic circuit breakers (40) in a power distribution system and communicated to the load center monitor (10) via a network (26) coupling the load center monitor (10)... | 04/03/2001 |
| 6195243 | Method and apparatus for adaptive configuration and control in a network of electronic circuit breakers A system including a load center monitor (10) connected to a plurality of digitally enhanced circuit breakers (40) by a communication bus (26) forms a network of reconfigurable circuit breakers which provides advanced monitoring and control of an electric... | 02/27/2001 |
| 6160690 | Distribution control system and distribution control method capable of isolating fault section without fail A distribution control system that can isolate a fault section without fail, even if control of load break switches becomes impossible because of a communication error between a control center and a feeder terminal unit. If a communication error takes pla... | 12/12/2000 |
| 6157527 | Load center monitor and digitally enhanced circuit breakers system for electrical power lines A method of communicating data with a plurality of electronic circuit breakers operatively connected in a power distribution system is disclosed and claimed herein. Each circuit breaker includes a communication port coupled to a network. The method compri... | 12/05/2000 |
| 6144305 | Electronic apparatus An electronic apparatus is provided that can eliminate unlawful cartridges while preventing a malfunction by checking whether there is a short-circuit of pin terminals at the time of turning on the power source and conducting further improved security che... | 11/07/2000 |
| 6111735 | Method for automated reconfiguration of a distribution system using distributed control logic and communications A system and method which detects and responds to abnormalities in a distribution system by reconfiguring nodes of the system to minimize the effects of the abnormality without the requirement of communicating with a central controller. The nodes in the s... | 08/29/2000 |
| 6008971 | Fault protection arrangement for electric power distribution systems A fault protection arrangement for electric power distribution systems includes a plurality of power sources connected to a distribution bus through circuit breakers and a plurality of loads connected through switches to the distribution bus, along with f... | 12/28/1999 |
| 6005758 | Communication terminal for electrical power line distribution system A communication terminal (10) is coupled to and operable in a power line network with at least one of plurality of intelligent circuit breakers (40) wherein each such circuit breaker (40) has a communication port. The terminal (10) includes a housing and ... | 12/21/1999 |
| 6005757 | Electrical switching device or trip unit acquiring predetermined settings from another electrical switching device or trip unit A first trip unit for interconnection with a second trip unit includes current transformers and potential transformers for sensing current, voltage and frequency conditions of a circuit breaker's separable contacts. A microprocessor-based trip mechanism p... | 12/21/1999 |
| 5999389 | Repeater for bus with bus fault isolation A repeater for a communication network having an isolation circuit for disabling the transmission of a fault-indicative signal through the repeater onto the network. A retriggerable one-shot starts timing with high to low signal transition. In the absence... | 12/07/1999 |
| 5940263 | Power capacitor bank switching devices A device is disclosed for connecting a plurality of capacitors between a first and a second terminal. The device includes a plurality of bus bars located in a parallel spaced apart relationship. A plurality of fasteners fasten the plurality of capacitors ... | 08/17/1999 |
| 5905616 | Load selectivity system for use with electronic trip circuit breakers A circuit breaker interconnect arrangement and a method for selective interruption of electrical circuits includes at least one upstream circuit breaker having an upstream electronic trip unit and a microprocessor and a plurality of downstream circuit bre... | 05/18/1999 |
| 5786699 | Test method and apparatus for testing a protective relay system A relay test apparatus for testing a protective relay operation of a protective relay system comprises GPS receivers, respectively connected to the protective relays, each GPS receiver analyzing time data included in a signal transmitted from a satellite ... | 07/28/1998 |
| 5666060 | Test method and apparatus for testing a protective relay system A relay test apparatus for testing a protective relay operation of a protective relay system comprises GPS receivers, respectively connected to the protective relays, each GPS receiver analyzing time data included in a signal transmitted from a satellite ... | 09/09/1997 |
| 5631795 | Line fault monitoring apparatus The present invention relates to a line fault monitor for detecting a short circuit in a terminal-side loop line and disconnecting the short-circuit portion from a power supply, so that the position of the short circuit can easily be specified. The line f... | 05/20/1997 |
| 5608327 | Methods and apparatus for identifying faulted phases on an electric power transmission line The invention provides method and apparatus for identifying the faulted phases on the occurrence of a single phase fault simultaneously on both circuits of a double circuit electric power transmission line using measurements taken at one end only of the l... | 03/04/1997 |
| 5576625 | Test method and apparatus for testing a protective relay system A relay test apparatus for testing a protective relay operation of a protective relay system comprises GPS receivers, respectively connected to the protective relays, each GPS receiver analyzing time data included in a signal transmitted from a satellite ... | 11/19/1996 |
| 5574611 | Service interruption minimizing system for power distribution line Upon the occurrence of a fault on the first distribution line, a faulty section on the distribution line is pinpointed, then a tie point switchgear at the tie point between the first distribution line in which the fault occurred and the other normal secon... | 11/12/1996 |
| 5514894 | Protection circuit device for a semiconductor integrated circuit device A protection circuit structure for an internal semiconductor integrated circuit. The protection circuit structure includes a first protection circuit having at least a first input pin and a first discharge pin, a second protection circuit having at least ... | 05/07/1996 |
