Patent application number | Description | Published |
20100165532 | FAULT CURRENT LIMITER - The present disclosure is related to a fault current limiter comprising, a current limiting unit configured to limit a fault current according to a reactance value by increasing the reactance value if the fault current is generated, and a driving unit configured to increases an inductance of the current limiting unit by generating a repulsive force by means of the fault current when the fault current is received and the driving unit is connected to the front end of the current limiting unit. | 07-01-2010 |
20110261496 | HYBRID FAULT CURRENT LIMITER - The present invention is related to a hybrid fault current limiter comprising a switching unit detaching a moving contact located on a cable and transmitting a trip signal if a fault current is flowed at an electric power system, a semiconductor switching unit connected in series with the switching unit and configured to be turned off to limit the flow of the fault current when the trip signal is transmitted, and a circuit breaking unit connected in parallel to the switching unit and the semiconductor switching unit and configured to limit the fault current detoured from the switching unit and the semiconductor switching unit. The present invention provides rapid treatment for the fault current problem by applying the algorithm sensing the occurrence of the fault current and the algorithm limiting the fault current simultaneously. | 10-27-2011 |
20130021067 | METHOD FOR DRIVING IGBT - Provided is a method for driving an IGBT, wherein a transient voltage applied across the IGBT is reduced by reducing a slope of a gate-emitter voltage of IGBT. | 01-24-2013 |
20130021705 | FAULT CURRENT LIMITER - Provided is a fault current limiter, the limiter including a detector detecting an inflow of a fault current and transmitting a turn-off signal to a power semiconductor element; the power semiconductor element changed to an OFF state by the turn-off signal; and a resistance element connected in parallel to the power semiconductor element to block the fault current. | 01-24-2013 |
20130021706 | FAULT CURRENT LIMITER - Provided is a fault current limiter, the limiter including a detector detecting an inflow of a fault current and transmitting a turn-on signal to a first switch and transmitting a turn-off signal to a power semiconductor element, the power semiconductor element changed to an OFF state by the turn-off signal, the first switch forming a current limiting circuit by being switched to an ON state by the turn-on signal, and a resistance element blocking the fault current, wherein the series connection between the resistance element and the first switch is connected in parallel to the power semiconductor element. | 01-24-2013 |
20130021707 | PROTECTION COORDINATION SYSTEM - Provided is a protection coordination system, the system includes a current limiter arranged on a line between a first and a relays to limit a fault current generated to within a predetermined scope. | 01-24-2013 |
20130043017 | HEAT SINKING PLATE - Provided is a heat sinking plate, the plate formed with a square-shaped opening of a predetermined length when viewed from the other direction of a rectangular metal plate by erecting four triangles obtained by diagonally and crossly cutting a square of a predetermined length to one direction of the metal plate at a predetermined first angle relative to the metal plate. | 02-21-2013 |
20140118001 | FAULT CURRENT DETECTING CIRCUIT - The fault current detecting circuit includes: a current detection unit that outputs a current detection signal; a first comparing circuit unit that compares the current detection signal with a predetermined reference current value and outputs a first output signal; a differentiator that differentiates the current detection signal to output a change slope of the current detection signal; a second comparing circuit unit that compares the change slope with a predetermined reference change slope value and outputs a second output signal; a third comparing circuit unit that compares the current detection signal with a predetermined current detection limit reference value and output a third output signal; and a trip determining unit that outputs a trip control signal only when the first output signal and the second output signal are maintained to be received and the third output signal is not received. | 05-01-2014 |