SU1624555A1 - Current-limiting switching device - Google Patents

Abstract

The invention relates to electrical engineering. The aim of the invention is to increase reliability in operation. The device comprises a housing 1 in which two fixed contacts 4.5, one spring-loaded movable contact (PC) 8 are located. Two arc-suppressing chambers 11, 12, a rod 9 connected to the PC 8, a spring-loaded swivel plate (PP) 18. electromagnet 17, the coil 20 of which is connected in series with a fixed contact 5. a spring-loaded locking element (PV) 19, an emphasis 24, limiting its stroke. The electromagnet 17 is installed with the possibility of impact of the core 21 through the PP 18 on the rod 9. The FE 19 is made in the form of a lever installed in the housing 1 with the ability to interact with the rod 9. Connected to the PC 8 and the PP 18. In the on position, the PP 18 engages with FE 19 and contacts are closed under the action of the spring 10. 2 Il. O 25 C ho sl ate

Description

This invention relates to electrical engineering, in particular, to current-limiting switching devices.

The purpose of the invention is to increase the reliability of work.

Figure 1 shows the proposed current limiting device in the position of the contacts is disconnected; figure 2 - the same, in the position of the contacts On.

The current-limiting switching device includes a housing 1 having two volumes 2 and 3. In volume 2 there are two fixed contacts 4 and 5, mounted on tires 6 and 7, a movable bridge contact 8 fixed to the rod 9, spring 10 of contact pressure and arc - Strong cameras 11 and 12.

The rod 9 is adapted to move in the guides 13 and 14 and, at the end entering the volume 3, has two bearing surfaces 15 and 16.

In the volume 3 there is an electromagnet 17, a rotatable plate 18 and a fixing element 19. The coil 20 of the electromagnet 17 is connected in series with the bus 7. The armature 21 is adapted to move along the axis of the coil 20.

The rotary plate 18 is installed opposite the core 21 and is designed to act on the bearing surface 15 of the rod 9 and is held on the stop 22 by the spring 23. The locking element 19 is made in the form of a lever mounted in the housing with the ability to interact with the rod 9 connected to the movable bridge contact 8 and a stop 24 is installed in the housing, limiting the stroke of the locking element 19. The locking element 19 is spring-loaded with a tension spring 25.

A possible variant of such a device with a single discontinuity, while, for example, the fixed contact 5 is replaced by a flexible connection between the bus 7 and the movable contact 8.

Current-limiting switching device operates as follows.

In the on position (FIG. 2), the rotatable plate 18 engages with the locking element 19. Under the action of the contact-contact spring 10, the contacts are closed.

When a short-circuit current flows through the circuit, the bark 21 of the electromagnet 17 is drawn into the coil 20 and acts on the rotary plate 18, which in turn affects the bearing surface 15 of the rod 9, opening the contacts. In this case, the rotatable plate 18 leaves the engagement with the locking element 19.

much earlier than it moves the rod 9 with a bridge contact by a contact gap of 5 mm. Under the action of the spring 25, the locking element 19 turns and acts on the bearing surface 16 of the rod 9, fixing the contacts in the open position.

Thus, the possibility of re-closure of contacts to short-circuit currents is eliminated, even with currents causing a slight course of the electromagnet core.

Operational shutdown occurs when the measles 21 electromagnet 17 is exposed.

The device is turned on by turning the locking element 19 counterclockwise until it engages with the rotary plate 18. The locking element 19 releases the bearing surface 16 of the rod 9, and the contacts are closed under the action of the contact spring 10.

The operative action is carried out with the help of operational nodes of the switching apparatus in which the proposed device is applied. This effect can be carried out both by manual and electromagnetic drive (not shown).

Due to the fact that the spring-loaded locking element is installed with the ability to interact with the rod, and the body has a stop that limits the motion of the spring-loaded locking element, the contacts are locked in the disconnected position both at high short-circuit currents and at currents close to the value of the electromagnet actuation current causing a short stroke of the electromagnet core, which is sufficient to release the spring-loaded locking element, since it has a slight engagement with the spring hydrochloric pivot plate.

Thus, in comparison with the prototype, the proposed device makes it possible to increase the reliability of the current-limiting switching device in the entire range of short-flush currents.

Claims (1)

Invention Formula A current-limiting switching device comprising a housing in which at least one fixed contact, one spring-loaded moving contact, at least one arcing chamber, a rod connected to a spring-loaded moving contact, spring-loaded, are located a plate, an electromagnet, the coil of which is connected in series with a fixed contact and which is installed with the possibility of acting through the spring-loaded rotary plate on the rod, and a spring-loaded locking element made in the form of a lever and installed with the possibility of interaction with the spring-loaded rotary plate, characterized in that the purpose of improving the reliability of work, it is provided with a stop installed in the housing and limiting the course of the spring-loaded locking element, and the spring-loaded one The connecting member is interlocked with the stem. eleven P / 4 15 18 J / / / / 23 FIG. 2