摘要:
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.
摘要:
Provided is a fault current limiter, the limiter including a detector (20) detecting an inflow of a fault current and transmitting a turn-on signal to a first switch (80) and transmitting a turn-off signal to a power semiconductor element (30), the power semiconductor element (30) changed to an OFF state by the turn-off signal, the first switch (80) forming a current limiting circuit by being switched to an ON state by the turn-on signal, and a resistance element (70) blocking the fault current, wherein the series connection between the resistance element (70) and the first switch is connected in parallel to the power semiconductor element (30).
摘要:
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.
摘要:
Provided is a fault current limiter, the limiter including a detector (20) detecting an inflow of a fault current and transmitting a turn-off signal to a power semiconductor element (30); the power semiconductor element (30) changed to an OFF state by the turn-off signal; and a resistance element (70) connected in parallel to the power semiconductor element to block the fault current.
摘要:
This specification relates to fault current limiter (FCL). More particularly, to solve problems of protecting and designing current limiting impedance in a protective coordination system, as limitations of the related art, the fault current limiter may measure heat capacity of a current limiting impedance unit (200) by detecting fault current flowing to the current limiting impedance unit and limiting the fault current flowing to the current limiting impedance unit according to the measured heat capacity, which may result in preventing the current limiting impedance unit from being damaged due to the fault current, preventing an extended accident due to the damaged current limiting impedance unit and enabling a stabilized system and line protection.
摘要:
The fault current detecting circuit includes: a current detection unit (200) that outputs a current detection signal; a first comparing circuit unit (300) that compares the current detection signal with a predetermined reference current value and outputs a first output signal; a differentiator (400) that differentiates the current detection signal to output a change slope of the current detection signal; a second comparing circuit unit (500) that compares the change slope with a predetermined reference change slope value and outputs a second output signal; a third comparing circuit unit (700) that compares the current detection signal with a predetermined current detection limit reference value and outputs a third output signal; and a trip determining unit (600) 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.
摘要:
Provided is a method for driving an IGBT, wherein a transient voltage (Vce) applied across the IGBT is reduced by reducing a slope of a gate-emitter voltage (Vge) of the IGBT.
摘要:
Provided is a fault current limiter, the limiter including a detector (20) detecting an inflow of a fault current and transmitting a turn-off signal to a power semiconductor element (30); the power semiconductor element (30) changed to an OFF state by the turn-off signal; and a resistance element (70) connected in parallel to the power semiconductor element to block the fault current.