2 results about "Breaking capacity" patented technology

The invention relates to a bidirectional H-bridge IGBT solid-state circuit breaker with high overcurrent capacity. The bidirectional H-bridge IGBT solid-state circuit breaker comprises: four diode branch circuits L1, L2, L3 and L4, wherein the diode branch circuit L1 and the diode branch circuit L2 are connected in the same conduction direction to form a branch circuit J1, the diode branch circuitL3 and the diode branch circuit L4 are connected in the same conduction direction to form a branch circuit J2, and the branch circuit J1 and the branch circuit J2 are reversely connected in parallel;and an IGBT cluster provided with a plurality of IGBT devices which are connected with one another, wherein one end of the IGBT cluster is connected to one contact between the branch J1 and the branch J2, and the other end of the IGBT cluster is connected to the other contact between the branch J1 and the branch J2. The bidirectional H-bridge IGBT solid-state circuit breaker has the advantages ofbeing high in overcurrent capacity, high in efficiency, high in current breaking capacity, few in switching elements and short in protection time, and can achieve microsecond-level reliable turn-offwithin 100 microseconds.

The invention discloses an electromagnetic circuit breaker time-delay tube with a leakage-proof function, and relates to the technical field of electromagnetic circuit breaker time-delay tubes, the electromagnetic circuit breaker time-delay tube comprises a fixed iron core body and a time-delay tube body, a boss in the middle of the fixed iron core body is in contact sealing with the inner wall of the time-delay tube body, the end part of the boss is provided with a first connecting column, and one end of the first connecting column is connected with a pressure spring; one end of the compression spring is connected with a second connecting column, the second connecting column is arranged on the movable iron core body, the movable iron core body is movably arranged in the time delay pipe body, time delay oil is arranged in the time delay pipe body, fusion welding bosses are arranged at the end of the fixed iron core body and the outer edge of a boss at the end of the time delay pipe body, and arc-shaped grooves are symmetrically formed in the end face of the fixed iron core body. According to the invention, the sealing effect and the sealing capability of the time-delay tube of the electromagnetic circuit breaker are improved, the sealing parts of the fixed iron core and the time-delay tube are prevented from being extruded by the time-delay oil due to thermal expansion, the service life is prolonged, the practicability is improved, the oil leakage phenomenon caused by extrusion due to expansion of the time-delay oil during a breaking capability test is avoided, and the sealing effect meets the detection requirement.