Circuit breakers and power distribution systems

Abstract

The present invention provides a breaker and a distribution system. The breaker comprises a contact mechanism, an electromagnetic trip mechanism and an arc extinction mechanism. The contact mechanism can break off the fault current in a circuit; the electromagnetic trip mechanism comprises a static iron core, a movable iron core and a coil, the coil is arranged to generate an electromagnetic field when fault current is received to allow the static iron core to drive the movable iron core to perform motion along the axial direction to generate thrust for prompting the contact mechanism to release; the arc extinction mechanism is configured to cut off the arc generated when the contact mechanism breaks off the fault current, wherein the electromagnetic trip mechanism and the arc extinction mechanism are arranged at the same side of the contact mechanism, the electromagnetic trip mechanism is arranged in an inclination mode relative to the arc extinction mechanism to allow the distance between the end portion, far away from the contact mechanism, of the electromagnetic trip mechanism and the arc extinction mechanism to be larger than the distance between the end, close to the contact mechanism, of the electromagnetic trip mechanism and the arc extinction mechanism. The installation space of the arc extinction mechanism of the breaker is increased, and the breaking capacity of the breaker is improved.

Description

technical field [0001] The invention belongs to the technical field of electrical switches, in particular to a circuit breaker and a power distribution system. Background technique [0002] As a protection component of the power transmission and distribution system, the circuit breaker can disconnect the circuit in time when an abnormal current occurs in the circuit, so as to ensure the safety of the entire circuit and other electrical loads. Due to the rapid development of the power grid, the capacity of the power transmission and distribution system continues to increase, and the integration of the system continues to increase. In order to improve the flexibility of electrical products, reduce manufacturing costs, facilitate management, and maximize the number of control loops in a unit space, it is necessary Reduce the size of the circuit breaker to fit the installation space of the power transmission and distribution system. [0003] At present, it is known that a conve...

AI Technical Summary

Problems solved by technology

Although the circuit breaker with a width of 9mm is small in size, it increases the difficulty of production and assembly of the product, and the current specification of the circuit breaker itself can only reach a maximum of 32A

In addition, due to its width limitation, the electromagnetic trip mechanism cannot wind more coils; after the width is reduced, the diameter of the iron core also needs to be reduced accordingly

In this way, for a circuit with a small current specification of only 1A or 2A, for example, it is difficult to realize short-circuit transient protection, so that the performance index of a circuit breaker with a width of 9mm is not as good as that of a circuit breaker with a width of 18mm

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