RU2356121C1 - Automatic high-speed circuit-breaker - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: invention is attributed to electric engineering, in particular to protective switching equipment. The circuit-breaker contains base, sliding and nonsliding contacts, closing electromagnet with magnetic conductor and armature, holding electromagnet with magnetic conductor and armature, opening spring. Holding electromagnet is pivotally fixed on closing electromagnet, and magnetic conductor of holding electromagnet is connected with armature of closing electromagnet via link.

EFFECT: increasing vibration resistance of structure and decreasing switch size.

3 dwg

Description

The invention relates to electrical engineering, in particular to protective switching equipment, and can be used to protect against overloads and short circuits of electrical installations, direct and alternating current lines, electrical equipment of urban electric vehicles.

High-speed automatic switches that are held in the on position due to magnetic flux in the working gap of the armature created by the current of the holding coil, and which trip when the specified magnetic flux decreases, are known, for example, from the book: A. Golubev High-speed circuit breakers. M.-L., publishing house "Energy", 1964, pp. 42-43. Utility Model Patent RU No. 333261 H01H 77/00, 2003

As the closest analogue, one should consider the switch shown in patent RU No. 333261 H01H 77/00, 2003

This switch contains a base, movable and fixed contacts, including an electromagnet with a magnetic circuit and an armature, holding an electromagnet with a magnetic circuit and an armature, disconnecting a spring.

The main disadvantage of this design is that due to the separate placement of the electromagnets, the circuit breaker is large in length.

Another disadvantage is the sensitivity to vibration, which reduces its reliability and limits applicability.

The objective of the invention was the development of a reliable and compact circuit breaker.

The technical result, which is achieved by the invention, is to increase the stability of the structure to vibration and reduce the size.

To achieve the stated result, the switching electromagnet is fixedly mounted on the base, and the holding electromagnet is pivotally mounted on the switching electromagnet, while the magnetic circuit of the holding electromagnet is connected to the armature of the switching electromagnet through the wings. In this design, reinforcing stiffness leads to increased reliability of the circuit breaker and reduces the size of the circuit breaker.

The invention is illustrated by drawings.

Figure 1 schematically shows a patented switch in the on position; figure 2 is the same in the off position; figure 3 is the same in the position when the switch is turned off by the emergency shutdown signal.

The automatic high-speed switch contains a base 1, movable 2 and fixed 3 contacts, including an electromagnet with a magnetic circuit 4 and an armature 5, a holding electromagnet with a magnetic circuit 6 and an armature 7, disconnecting the spring 8. The holding electromagnet rotates on the axis 9 in the bracket 10 mounted on the switching electromagnet . The turning on electromagnet is rigidly mounted on the base 1. The holding electromagnet magnetic circuit 6 is connected to the anchor 5 of the turning on electromagnet by means of a link, including a guide 11, in which the roller 12 is located on the axis 13 of the armature 5. The armature 7 is connected to the movable contact through an isolation rod 14. The disconnecting spring 8 is fixed to the movable contact through the earring 15.

The switch operates as follows.

In the on position (figure 1), the magnetic circuit 4 and the armature 5 are attracted to each other due to the current in the coil of the turning on electromagnet. The armature 7, in turn, is held in an attracted position to the magnetic circuit 6 due to the current in the coil of the holding electromagnet. Contacts 2, 3 are closed, and spring 8 is cocked to disconnect.

For operational shutdown, it is necessary to interrupt the holding current in the coil of the switching electromagnet. Under the action of the breaking spring 8, the movable contact 2 and the holding electromagnet go into the off position until the armature of the holding electromagnet reaches the stop 16, while the armature 7 and the magnetic circuit 6 of the holding electromagnet remain attracted to each other (figure 2).

The signal from the current sensor (or other emergency shutdown sensor) interrupts the current in the coils of the holding and turning on electromagnets. Under the action of the breaking spring 8, the movable contact 2 and the armature 7 of the holding electromagnet go into the off position (figure 2). After that, the armature of the switching electromagnet with deceleration also goes into the off position, as shown in Fig.2. If a current-switching electromagnet passes through a coil, the switch will turn on.

Thanks to these design differences, a circuit breaker with reduced dimensions and increased reliability has been created.

Claims (1)

A quick-acting automatic switch containing a base, movable and fixed contacts, including an electromagnet with a magnetic circuit and an armature, holding an electromagnet with a magnetic circuit and an armature, breaking a spring, characterized in that the switching electromagnet is fixedly mounted on the base, and the holding electromagnet is pivotally mounted on the switching electromagnet, when this magnetic circuit holding the electromagnet through the wings connected to the armature of the electromagnet.

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