RU63116U1 - AUTOMATIC DIRECT CURRENT SWITCH - Google Patents

Abstract

The utility model relates to electrical engineering. A quick-acting automatic switch contains a base, a magnetic circuit holding the coil, an anchor, movable and fixed contacts, a rod (T) connecting the armature to the movable contact, a contact pressing spring disconnecting the spring and the earring (C) connected to T and the base. The movable contact is rigidly mounted on C. With an additional lever pivotally connected to the base. The breaking spring is installed along T. The spring of contact pressing is installed with the possibility of impact on the end C, opposite its end connected with T.

The technical result is an increase in the speed of the circuit breaker and an increase in the overhaul period. This is achieved by opening the contacts simultaneously with the choice of failure.

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Description

The utility model relates to electrical engineering, in particular to protective switching equipment, and can be used to protect against overloads and short circuits of electrical installations and direct current lines.

Automatic high-speed DC switches that are held in position by the magnetic flux in the working gap of the armature created by the current of the holding coil and tripped when this magnetic flux is reduced are known, for example, from the following sources: RF patent for the invention No. 2239907 Н 01 Н 77 / 06, 2004 (1); Reference book on the adjustment of electrical equipment of industrial enterprises. Ed. M.G. Zimenkova et al. - M .: Energoatomizdat, 1983, p. 236-238 (2); Golubev A.I. High-speed circuit breakers. - M. - L .: Energy, 1964, p. 55-57 (3).

As a prototype, select source 1. The circuit breaker for this source contains a base, a magnetic circuit holding the coil, an armature, movable and fixed contacts, a rod connecting the armature to the movable contact, a contact pressing spring, which is also a disconnecting spring and an earring, one end of which is articulated mounted on the base, and another pivotally connected to the movable contact. When this switch is turned off, the anchor selects the failure of the contacts, after which the contacts open.

The disadvantage of this switch is that when it is turned off, a failure is first selected, and then the contacts open. This reduces the speed of the circuit breaker. In addition, due to the dependence of the circuit breaker speed on the size of the failure, there is no possibility of increasing the circuit breaker operating time without adjustment, which reduces the overhaul period and increases operating costs.

The utility model solves the problem of creating a circuit breaker with a small own trip time and convenient to use.

The technical result, which is created by the utility model, consists in increasing the speed of the circuit breaker and increasing the overhaul period.

This is achieved by the fact that the movable contact is rigidly mounted on the earring, which is pivotally connected to the base by means of an additional lever, while the disconnecting spring is mounted with the possibility of acting on the movable contact along the link connecting the armature to the movable contact, and the contact pressing spring is installed with the possibility of influencing The end of the earring is the opposite of the end of the earring associated with traction.

With this design, when the circuit breaker is turned off, both springs act simultaneously on the movable contact. Under the action of the disconnecting spring, the movable contact falls off from the stationary, and under the action of the contact pressing spring, a failure is selected. In this case, the movable contact makes a plane-parallel movement, and the choice of failure occurs simultaneously with the opening of the contacts. Due to the simultaneous opening of the contacts and the choice of failure, an increase in the speed of the circuit breaker is achieved and the dependence of the speed of the circuit breaker on the size of the failure is eliminated. The latter allows you to increase the failure to increase the overhaul period.

The utility model is illustrated by an example of a circuit breaker. Figure 1 of the drawing shows a patentable switch in the on position; figure 2 is the same in the off position.

The automatic high-speed direct current switch contains a base 1, a magnetic circuit 2, a holding coil 3, an anchor 4, a movable contact 5 rigidly fixed to an earring 6, a fixed contact 7, a rod 8, a disconnecting spring 9, a contact pressing spring 10 and

a bracket 11 fixed to the base, on which the springs 9 and 10 are attached. A rod 8 connects the armature to the movable contact through the earring 6. The earring is connected at one end to the said rod and the other through the additional lever 12 is pivotally connected to the base 1 through the bracket 11.

The breaking spring is installed along the rod and in the on position of the switch tends to turn the contact 5 relative to the hinge 13 in the direction of opening of the contacts.

The contact pressing spring is installed on the bracket 11 and acts on the end of the earring connected to the lever 12. In this case, in the on position of the switch, the contact pressing spring tends to rotate the movable contact relative to the hinges 14 and 15, providing the necessary contact pressing on the contacts, and there is between the bracket and the earring clearance δ. The gap δ (contact failure) creates a guaranteed contact closure with a margin for their wear.

When the switch is turned on under the action of traction 8, contact 5 together with the earring 6 rotates around the hinge 13 until it stops into the fixed contact 7. Then, the contact 5 slides along the surface of the fixed contact by moving the lever 12 around the hinge 14 and thereby ensures grinding of the contacts. Spring 10 provides the necessary amount of contact pressing. The on position of the switch with pre-selected backlash in the hinges 13 and 14 is shown in figure 1.

The circuit breaker trips when the current in the holding coil drops. The anchor cannot be held in the pulled position and, under the action of the breaking spring 9, which transfers the force to the rod 8, rotates, falling away from the magnetic circuit. In this case, the movable contact 5 makes a complex movement. At the same time, both springs 9 and 10 act on the movable contact. Under the action of the efforts of the spring 9, the contact rotates in the hinge 13 toward the disconnected position, and under the action of the forces of the spring 10 it rotates relative to the hinge 14 until

the gap δ (dip) will be selected. Thus, the choice of failure does not affect the opening time of the contacts (occurs simultaneously with the opening of the contacts) (figure 2).

Due to the combined action of the springs and the hinged connection of the earring of the movable contact with the base through an additional lever, an increase in the speed of the switch is achieved, while the magnitude of the failure does not affect the opening time of the contacts, which increases the overhaul interval.

Claims (1)

An automatic high-speed direct current circuit breaker containing a base, a magnetic circuit holding the coil, an armature, movable and fixed contacts, a link connecting the armature to the movable contact, a contact pressing spring disconnecting the spring and the earring, one end of which is connected to the said link, and the other end to base, characterized in that the movable contact is rigidly mounted on the earring, which by means of an additional lever is pivotally connected to the base, while the breaking spring is installed with the possibility of effects on the movable contact along the rod connecting the armature to the movable contact, and the contact pressing spring is installed with the possibility of influencing the end of the earring, opposite the end of the earring associated with the rod.