Abstract:
A circuit breaker comprises a plurality of stacked breaker modules (3) arranged in series. Each breaker module (3) comprises in parallel a mechanical switching assembly (8), a semiconductor switching assembly (10) and an arrester assembly (12). The circuit breaker can easily be adapted to a larger number of applications and voltage ranges by varying the number of breaker modules (3).
Abstract:
The present invention relates to a dielectric insulation medium comprising a) a fluoroketone a) containing 5 carbon atoms, in a mixture with b) a dielectric insulation gas component b) different from the fluoroketone a), in particular air or an air component, the dielectric insulation medium, in particular the dielectric insulation gas, having a non-linearly increased dielectric strength that is larger than a sum of dielectric strengths of the gas components of the dielectric insulation medium.
Abstract:
A high voltage DC breaker apparatus configured to interrupt a fault current occurring in a high voltage DC conductor (1) comprises a mechanical interrupter (2), at least one semiconductor device (3) connected in series with the interrupter, an arrester (5) connected in parallel with the semiconductor device and an LC-circuit (6) connected in parallel with the series connection of the semiconductor device and the interrupter. A control unit (12) is configured to, upon detection of a fault current, control switching of the semiconductor device (3) at a frequency adapted to the values of an inductance (7) and a capacitance (8) of the LC-circuit for charging the capacitance by the fault current while making the current through the interrupter (2) oscillating with an increasing amplitude and the interrupter to open for having the mechanical contacts thereof separated when current zero-crossing is reached for obtaining interruption of the fault current through the interrupter.
Abstract:
A direct current (DC) circuit breaker module (100) is provided. The module comprises a DC circuit (101), a mechanically operated vacuum interrupter (104) for interrupting the DC circuit, a repulsive force actuator for operating the interrupter in response to receiving a trip signal (111), an active resonance circuit (105) connected in parallel with the interrupter, and a surge arrester (106) connected in parallel with the interrupter. Preferably, the actuator is arranged inside the vacuum chamber of the interrupter. Further, a DC circuit breaker is provided, the circuit breaker comprising a plurality of circuit breaker modules connected in series. By series-connecting a plurality of circuit breaker modules, a circuit breaker may be constructed having a desired operating voltage higher than the operating voltage of a single circuit breaker module.
Abstract:
A high voltage DC circuit breaker comprises a semiconductor switching assembly (3) in series to a mechanical switch (4). When the semiconductor switching assembly (3) is switched off due to a current fault, the residual current (I R ) flowing through the arresters (9) of the assembly (3) is switched off by the mechanical switch (4). A capacitor (12) arranged parallel to mechanical switch (4) leads to passive resonance effects, which in turn induce current zero crossings in its arc. The current zero crossings allow to extinguish the arc reliably. The mechanical switch (4) can be an AC circuit breaker.
Abstract:
A high voltage DC breaker apparatus configured to interrupt a fault current occurring in a high voltage DC conductor (1) comprises a mechanical interrupter (2), a semiconductor device (3) connected in series with the interrupter, an arrester (5) connected in parallel with the semiconductor device and an LC-circuit (6) connected in parallel with the series connection of the semiconductor device and the interrupter. A control unit (12) is configured, upon detection of a fault current, to control switching of the semiconductor device (3) at a frequency adapted to the values of an inductance (7) and a capacitance (8) of the LC-circuit for charging the capacitance by the fault current while making the current through the interrupter (2) oscillating with an increasing amplitude and the interrupter to open for having the mechanical contacts thereof separated when current zero-crossing is reached for obtaining interruption of the fault current through the interrupter.
Abstract:
A switch comprises a first switching assembly (la) in a first metal enclosure (2a) and a second switching assembly (lb) in a second metal enclosure (2b). The two metal enclosures (2a, 2b) are electrically insulated from each other as well as from ground. This allows arranging a plurality of metal-enclosed switching assemblies in series while avoiding excessive electrical fields in any of them.
Abstract:
The presentinvention relates to a dielectric insulation medium. The insulation medium is characterized in that it comprises a fluoroketone having from 4 to 12 carbon atoms.
Abstract:
A circuit breaker comprises a plurality of stacked breaker modules (3) arranged in series. Each breaker module (3) comprises in parallel a mechanical switching assembly (8), a semiconductor switching assembly (10) and an arrester assembly (12). The circuit breaker can easily be adapted to a larger number of applications and voltage ranges by varying the number of breaker modules (3).