SHAKIRA, LIMITED Patent applications |
Patent application number | Title | Published |
20140139956 | FAULT DETECTING DEVICE FOR AN ELECTRICITY SUPPLY - A fault detecting device having a plurality of supply conductors, including a first current transformer having a primary winding comprising at least two supply conductors and a secondary winding into which a current is induced in response to a fault current in the primary winding. A fault detection circuit connects the secondary winding to an electromechanical actuator having mechanical contacts in the supply conductors, the fault detection circuit generating an output signal to the actuator when an induced current is detected in the secondary winding, the output signal causing the actuator to open the mechanical contacts. The device further includes a second current transformer having a primary winding connected to an oscillator and a secondary winding comprising at least one supply conductor, the second current transformer arranged to induce an oscillating current into the at least one supply conductor in the event of a fault condition. | 05-22-2014 |
20140111891 | ELECTROMECHANICAL SWITCHING CIRCUIT WITH MEMORY - An electromechanical switching circuit comprises an integrated circuit (IC) having an input terminal, an output terminal and a control terminal. The IC is arranged based on a voltage transition at the control terminal, sampling the voltage level at the input terminal and supplying it at the output terminal. The output voltage level is maintained at the output terminal until a voltage transition at the control terminal. A control circuit connected to the control terminal includes a first monostable switch whose actuation causes a voltage transition at the control terminal so the voltage level applied at the input terminal is supplied at the output terminal. An output circuit includes a second, electromechanical, monostable switch whose contacts are moved to their unstable state in response to a first voltage level at the output terminal and allowed to resume their stable state in response to a second voltage level at the output terminal. | 04-24-2014 |
20140009856 | DEVICE FOR DETECTING A FAULT IN AN AC SUPPLY - A device for detecting a fault in an AC supply comprises a circuit (CT, | 01-09-2014 |
20130162242 | DC & AC CURRENT DETECTION CIRCUIT - A circuit for detecting a DC current in a conductor (L | 06-27-2013 |
20130038971 | ARC FAULT DETECTOR FOR AC OR DC INSTALLATIONS - An arc fault detector comprises a current transformer (CT) having a primary winding and a secondary winding (W | 02-14-2013 |
20120229943 | DEVICE FOR DETECTING A FAULT IN AN AC SUPPLY - A device for detecting a fault in an AC supply comprises a circuit (CT, | 09-13-2012 |
20090244794 | Switching Circuit - A switching circuit, e.g. an RCD, comprises a pair of mechanical contacts (M) in an alternating current electricity supply (N, L) and circuit means (SCR) for opening the contacts to cut off the supply in response to a switching signal (S). The switching circuit includes further circuit means (Rs, Cs, D | 10-01-2009 |