67results about How to "Shorten the arcing time" patented technology

A method for testing high-voltage alternating-current power switches in a synthetic test circuit has the step of connecting a high-voltage oscillating circuit in parallel to a test switch Bt in a time interval before the current zero of an interruptible high current, which is determined by a half-cycle duration (Th / 2) of the oscillating current (ih) less the duration of equivalence (Δtse) of the sole flow of the oscillating current as sequential current in the test switch with a stress exerted upon the switch by the homogeneous current in a direct test circuit. The sequential-current flow duration of the equivalence results, at least approximately, from the comparison of the values of common physical stress parameters acting in the test switch during the test, on the one hand, in the synthetic test circuit and, on the other hand, in the direct test circuit.

The invention discloses a high-voltage double-break circuit breaker. The high-voltage double-break circuit breaker comprises circuit breaker casings and driving mechanisms, wherein two arc extinguishing chambers are symmetrically arranged in the circuit breaker in a left and right manner, a certain distance is formed between the arc extinguishing chambers, movable cover-plate ends of the arc extinguishing chambers are oppositely arranged, a fixed contact and a movable contact are arranged in each arc extinguishing chamber, the movable contacts are electrically connected with each other and are connected with one ends of connecting-rod mechanisms, and the fixed contacts are led out of the arc extinguishing chambers; the driving mechanisms are connected with the other ends of the connecting-rod mechanisms at the same position through insulated tension rods, the driving mechanisms drive the insulated tension rods to move up and down so as to drive the connecting-rod mechanisms to synchronously move, and further the gathering movement and the separating movement of the movable contacts and the fixed contacts are synchronously realized, wherein the leading-out terminals of the two fixed contacts are used as the circuit access terminals of the circuit breaker. The high-voltage double-break circuit breaker disclosed by the invention solves the problem that the switching voltage of vacuum circuit breakers is not high, and besides, the time for opening or closing a brake is shortened; the mechanical structure is simple, and the reliability of the circuit breaker is improved.

A contact system of a circuit breaker, which is arranged inside the circuit breaker, includes a moving contact and a static contact, the protruding end of the moving contact can cooperate with the static contact, and the moving contact The connecting end is rotatably arranged on the rotating shaft through the moving contact positioning shaft; the connecting end is provided with an auxiliary shaft, the auxiliary shaft is located below the moving contact positioning shaft and the axis center of the auxiliary shaft and the moving contact The line connecting the center of the contact positioning shaft and the protruding end of the moving contact forms an obtuse angle, the auxiliary shaft is prism-shaped and its two ends protrude from the moving contact; the first side of the contact spring The arm is limited by the rotating shaft, the second side arm is blocked by the part of the auxiliary shaft protruding from the movable contact, and the contact spring is compressed between the auxiliary shaft and the rotating shaft, and at In the closed state, the second side arm is in contact with the edge of the auxiliary shaft protruding from the movable contact. The contact system of the invention has compact structure and good reliability, can effectively prevent the contacts from falling back, and improve the breaking capacity of the circuit breaker.