Class / Patent application number | Description | Number of patent applications / Date published |
361044000 | With differential sensing in a polyphase system | 6 |
20090207536 | METHOD AND APPARATUS FOR MEASURING DC CURRENT IN AN AC GENERATOR - An exemplary ground fault detection device is capable of detecting a ground fault on multiple phases. The ground fault detection device includes a monitoring module that monitors the phases and determines if there is a non-zero electrical energy value sum for a selected interval on each phase. An output module provides a ground fault indication when all of the phases have a non-zero electrical energy sum for the selected interval. | 08-20-2009 |
20100002343 | GROUND FAULT INTERRUPTS FOR SOLID STATE POWER CONTROLLERS - A solid state power control scheme is provided with a ground fault interrupt function. Essentially, if a neutral wire is associated with the power supply, the current is sensed in that neutral wire. The sensed neutral wire current is subtracted from a summed current on the power supply lines. If that result is greater than a predetermined limit, then the ground fault function is actuated and the circuit is opened. For power supplies, both those with and without neutral wires, the current is sensed by a shunt resistor on the power supply line. | 01-07-2010 |
20100008000 | GROUND FAULT PROTECTION CIRCUIT FOR MULTI-SOURCE ELECTRICAL DISTRIBUTION SYSTEM - Disclosed herein is a ground fault protection circuit for an electrical distribution system, the electrical distribution system having a plurality of power sources each having an associated main circuit breaker and being electrically coupled to an associated load with a tie circuit breaker electrically coupled therebetween, the main and tie circuit breakers having associated therewith phase and neutral current transformers (CTs) for sensing an associated current. The ground fault protection circuit includes first, second and third auxiliary differential current transformers, each in signal communication with outputs of respective phase and neutral current transformers associated with respective first and second main circuit breakers and a tie circuit breaker. A control circuit has a defined topology that provides signal communication between each of the auxiliary differential current transformers. | 01-14-2010 |
20130229735 | HIGH-IMPEDANCE FAULT DETECTION AND ISOLATION SYSTEM - A high-impedance system that utilizes asynchronous, line-mounted single-phase current and voltage sensors with rolling data logs and a common clock or other event trigger to synchronize the signals to a common time scale whenever a fault event is detected. The use of asynchronous, single-phase current and voltage angle sensors with rolling data logs, along with a common clock to synchronize the signals to common time scale whenever a fault event is detected, avoids the need for simultaneous three-phase current measurement. Integration of information, triggered by the detection of a loss or sufficient change of current on three or four (with a neutral current) devices, is used to determine the presence and direction of high-impedance faults and then report it, typically to a central control center via SCADA or another communication system, which implements fault isolation. | 09-05-2013 |
20160181780 | Systems and Methods for Subsea Cable Ground Fault Isolation | 06-23-2016 |
20190148930 | GROUND FAULT CURRENT INTERRUPTER CIRCUIT | 05-16-2019 |