RU75896U1 - AUTOMATIC FAST SWITCH - Google Patents

Abstract

The automatic high-speed switch is used to protect against overloads and short circuits of electrical installations and direct and alternating current lines. It contains a frame, movable and fixed contacts, holding an electromagnet with an anchor and a magnetic circuit, disconnecting the spring, contact pressing spring, lever and switching mechanism. The novelty is that the switch contains a block contact that is installed so that the distance from the lever to the switch button of the block contact is equal to the failure of the contacts of the switch, which eliminates the possibility of turning on the switch in the absence of failure and increases the reliability of operation, and also increases its life service. 1 p. F-l 2 FIG. heck.

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 and alternating current lines.

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 following sources: Patent No. 333261 RU for utility model “Automatic high-speed switch” dated May 29, 2003, A. Golubev High-speed circuit breakers, M. - L., Energia Publishing House, 1964, pp. 42-43, as well as pp. 44-47.

As the closest prototype, based on the number of common essential features, we can consider the switch according to the first source.

This switch contains a frame, movable and fixed contacts, holding an electromagnet with a magnetic circuit and an armature, breaking the spring, contact pressing spring, lever and switching mechanism.

The main disadvantage of this design is as follows. During the operation of the switch, the contacts are subject to wear, which is associated with the transfer of material in the molten bridge when the contacts open. As the contact surfaces wear, the stroke in the contacts decreases. This may cause an air gap between the contact surfaces.

in a closed state and as a result of this - to a violation of the contact connection. To prevent such a danger, all opening contacts have a so-called additional stroke in the contacts (failure), the value of which for automatic high-speed switches does not exceed 3-6 mm. During continuous operation of the circuit breaker, the magnitude of the dip decreases, which reduces the reliability of the circuit breaker.

The task of creating a utility model was to develop a more reliable circuit breaker and increase its service life.

The technical result, which is achieved by the utility model, consists in excluding the circuit breaker when selecting the contact failure, increasing the reliability of the circuit breaker and increasing its service life.

For this, the switch contains an additional block contact, which is set so that the distance between the switch button of the block contact and the lever is equal to the failure of the contacts. This eliminates contact closure when selecting a failure.

The utility model 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 frame 1, movable 2 and fixed 3 contacts, holding an electromagnet with a magnetic circuit 4 and an armature 5, disconnecting a spring 6, a contact pressing spring 7, a lever 8 and an electromagnetic switching mechanism 9. Anchor 5 and a magnetic circuit 4 are mounted on a common axis 10 Anchor 5 is connected to the movable contact through an insulating rod 11. A spring of contact pressing 7 is located between the switching mechanism 9 and the magnetic circuit 4.

In this case, the switching mechanism 9 is connected to the magnetic circuit 4 through the lever 8, with the help of the springs 7 and 12. The spring 13 abuts against the bracket 14, on which the block contact 15 is fixed.

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 holding electromagnet. The anchor of the switching mechanism 9 is in an attracted position due to the holding current in the coil of the electromagnet of the switching mechanism. The gap 6 (contact failure) provides guaranteed closing of contacts 2 and 3 when they are worn.

The signal from the current sensor (or other emergency shutdown sensor) interrupts the current in the coils of the holding electromagnet and the electromagnet of the switching mechanism. Under the action of the springs, the anchor of the switching mechanism, the lever 8, the magnetic circuit 4, the anchor 5 of the holding electromagnet and the rod 11, and with it the movable contact 2 go into the off position (figure 2).

When the contacts of the switch are worn out until the failure δ = 0 is completely selected, the lever 8 switches the block contact 15, which transmits a signal to the control station to turn off the switch. When a signal is sent to turn on, the switch will not turn on.

Thanks to the indicated design differences, a reliable and quick-acting automatic high-speed circuit breaker has been created.

Claims (1)

An automatic high-speed switch, comprising a frame, movable and fixed contacts, holding an electromagnet with a magnetic circuit and an armature, breaking a spring, a contact pressing spring, a lever and a switching mechanism, characterized in that the switch contains an additional contact block, which is installed so that the distance from the lever to the button for switching the block contact is equal to the failure of the switch contacts.