RU2368976C1 - Fast-acting automatic circuit breaker - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: invention is related to electric engineering, in particular to protective switching equipment. Circuit breaker comprises base, movable and fixed contacts, holding electromagnet with magnetic conductor and anchor, including pneumatic drive with cylinder, stem and piston, disconnecting spring, spring of contact pressing. Stem of connecting pneumatic drive and anchor of holding electromagnet are connected by means of latch.

EFFECT: higher efficiency in circuit breaker opening and improved manufacturability in its production, reduction of weight and dimensional parametres of circuit breaker and its cost.

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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 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 tripped when this magnetic flux decreases, are known from the following source: Electric locomotive VL11: Operation manual. - M.: Transport, 1994.p. 53-55.

The switch on this source contains a movable and fixed contacts, holding an electromagnet with a magnetic circuit and an armature, including a pneumatic actuator with a cylinder, rod and piston, disconnecting the spring and contact pressing spring.

The main disadvantage of this design is that the circuit breaker is operated using a lever system (including a lever, a contact lever, etc.). The presence of additional levers in the design reduces the speed of the circuit breaker, complicates the process of its manufacture and, as a result, increases the cost of the structure. A large number of parts increases the likelihood of breaker failure.

The task of creating a patentable invention was the development of reliable in operation and technological in the manufacture of circuit breaker.

The technical result that is achieved by the invention is to increase the speed when the circuit breaker is turned off and to increase the manufacturability in its manufacture.

To achieve the stated result, the stem of the actuating pneumatic actuator and the anchor of the holding electromagnet are connected using a latch. This design provides high speed circuit breaker. By reducing the number of parts of the entire structure, the manufacturing process and assembly of the circuit breaker is simplified, and therefore, the cost of the circuit breaker is reduced. In addition, the overall dimensions of the circuit breaker are reduced.

The invention is illustrated by an example implementation.

Figure 1 schematically shows a patented switch in the on position; figure 2 is the same in the off position.

The automatic high-speed switch contains a base 1, movable 2 and fixed 3 contacts, holding an electromagnet with a magnetic circuit 4 and an armature 5, including a pneumatic actuator with a cylinder 6, a rod 7 and a piston 8, disconnecting a spring 9, a contact pressing spring 10. A rod 7 of a pneumatic actuator and the anchor 5 of the holding electromagnet are connected using a latch 11. The latch is fixed on the axis 12 and is spring-loaded by a spring 13. The magnetic circuit 4 and the armature 5 are mounted on the axis 14. The movable contact 2 and the armature 5 are connected by a rod 15, on which the disconnecting spring 9 is placed. The contact pressing spring 10 is placed on the stem 7 with the possibility of acting on the magnetic circuit 4. To ensure reliable drop-off of the armature 5 from the magnetic circuit, an accelerating spring 16 is used.

The switch operates as follows.

When current flows through the coil of the holding electromagnet, the armature 5 (Fig. 1) is attracted to the magnetic circuit 4. Compressed air is supplied to the cylinder 6 of the pneumatic drive. In this case, the piston 8 and the rod 7 are driven by compressed air pressure. The movement of the rod 7, in turn, is transmitted to the holding electromagnet, the rod 15 and the movable contact 2. The latch 11 is engaged with the rod 7 and holds the rod 7 in the on position. Under the action of compressed air pressure, the breaking spring 9 is pressed, and contacts 2 and 3 are closed. The switch goes into the on position.

The circuit breaker is as follows. The signal from the current sensor (or other emergency shutdown sensor) interrupts the current in the coil of the holding electromagnet. The anchor 5 cannot be held in the position drawn to the magnetic circuit 4 and under the action of the trip spring 9 goes into the off position (figure 2), while the anchor 5 knocks the latch 11 out of engagement with the rod 7 of the pneumatic actuator. The rod 7 and cylinder 6 under pressure of compressed air are returned to their original disconnected position. At the moment of movement of the armature 5, the rod 15 and the movable contact 2 immediately go into the off position.

Due to the indicated structural differences, namely, the connection of the pneumatic actuator rod and the holding magnet armature with a latch without additional lever systems, the circuit breaker speed is increased. In addition, a decrease in the number of parts in the design indicates a decrease in overall dimensions and, consequently, the cost of the switch. Thus, a circuit breaker with increased reliability and manufacturability was created.

Claims (1)

A quick-acting automatic switch containing a base, movable and fixed contacts, holding an electromagnet with a magnetic circuit and an armature, including a pneumatic actuator with a cylinder, a rod and a piston, a disconnecting spring, a contact pressing spring, characterized in that the actuating rod of the pneumatic actuator and the holding magnet anchor are connected with using the latch.

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