摘要:
The present invention relates to a circuit breaker including a first (1) and a second (2) contact movable relative each other between an open position, in which the contacts are at a distance from each other, and a closed position, in which the contacts are in electrical contact with each other, and the first contact includes one or more contact elements (3) adapted to be in contact with the second contact when the contacts are in the closed position. The first contact comprises a mesh (8) made of metal arranged in thermal contact with the contact elements.
摘要:
The present invention relates to a method and an apparatus for predicting the future behavior of currents in current paths (1a-c) in a multi-phase alternating current electrical power system. The apparatus comprises: a first member (3) adapted to continuously sample the voltage for at least one of said current paths, a second member (2) adapted to continuously sample the current for the current paths, a computation unit (5) adapted estimate phase-to-ground parameters and phase-to-phase parameters for the voltage of the current paths based on the values of the voltage, a predictor arrangement (6) adapted to predict a first set of current values for the current paths based on the estimated phase-to-ground parameters, and to predict a second set of current values for the current paths based on the estimated phase-to-phase parameters, a comparator (8) adapted to compare the first and second set of predicted current values with sampled current values from the same point in time, and an evaluation module (10) adapted to based thereon determine whether the first or second set of predicted current values is a valid prediction of the current in the path.