JPS5913127B2 - Contact device for high voltage disconnector or earthing switchgear - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an opening/closing arm configured to be rotatable, a contact connected to the opening/closing arm that contacts a mating contact by a spring force in a closed circuit position, and a contact surface of this contact that is free from freezing. The present invention relates to a contact device for a high voltage disconnector or earthing switch having an ice crushing device for when

From German Patent No. 935,740, a high-voltage disconnector, in particular for outdoor installation, is known which has a tubular opening and closing arm which is arranged pivotably to one side on a support insulator.

The opening/closing arm has a contact at its free end, and the contact is configured to be rotatable about the axis of the opening/closing arm,
It is also biased by a torsion spring provided inside the opening/closing arm.

Therefore, due to the force of this torsion spring, the contacts receive contact force with each other when the disconnector is in the closed state.

In this known device, the contactor is pressed by a rotational force so that the ice layer is scraped off during closing and disconnection.

Also, according to West German Utility Model Registration No. 1797316,
Contact devices for outdoor disconnectors are known.

In this, the ice breaking device is constructed as a steel arm with blades.

This blade is configured so that it does not come into contact with the mating contact when the disconnector is not frozen, and to break and peel off the ice layer when the mating contact is frozen.

The ice crushing device is installed in the disconnector in such a way that the ice crushing device first hits a frozen mating contact before the contacts come into contact with each other during a circuit-closing operation.

As a result, the ice on the other contact is peeled off by the blade of the ice crusher, so that the contact can easily come into contact with the other contact.

If the ice layer on the mating contact is so thin that it cannot be reached by the blades of the ice crusher, additional measures must be taken to remove the ice layer in order to ensure reliable closing of the disconnector. .

In particular, in a grounding switch, in order to protect workers, it is necessary to ensure electrical conduction between a grounded high voltage part and a grounding system.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a contact device of the type described above, in which the ice breaking device can operate effectively even when the ice layer is thin, thereby making supplementary means unnecessary.

In other words, the main objective of the present invention is to provide an ice crushing device that operates reliably and is as simple as possible in construction.

According to the present invention, the ice crushing device is fixed to the mating contact, and when in an open state, extends outside the contact surface of the mating contact,
It has a spring-elastically bendable ice-breaking edge that is pressed by a contact when in the closed circuit state.

During the course of the closing operation, the ice-breaking device is pressed with its spring-elastically bending ice-breaking edges in a scissor-like manner by the contacts, so that the functionality of the ice-breaking device is always guaranteed regardless of the position of the contact device. There is.

The biasing of the contact device by the ice-breaking edge is always effective and the same whether the contact device has a thin or thick layer of ice or is not frozen.

Therefore, even when the ice layer is very thin, the ice crushing device works effectively.

In a particularly advantageous embodiment of the invention, the ice-breaking edge is constructed by a bow-shaped spring bent in a U-shape according to the contour of the mating contact.

One of the legs of this U-shaped arcuate spring extends beyond the contour of the mating contact in the open state and forms a breaking edge that can bend elastically.

The ice crushing device is preferably provided on the side of the contact surface of the mating contact, but may also be provided on the contact surface of the mating contact.

In any case, the ice crushing device is fixed to the free end of the mating contact and is configured to move 5 at the point of contact with the contact.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on embodiments of a grounding device for a high-voltage disconnector shown in the drawings.

FIG. 1 shows a two-insulator rotating type high-voltage disconnector.

The opening/closing arms 1, 2 of this can be opened or closed by a drive 6 via a rotatable support insulator 3.4.

The electrical connection terminal is located on the top of the support insulator 3.4 and is designated by the number 5.
is shown.

A grounding switch 7 is provided for the protection of workers.

This earthing switch 7 is equipped with a rotatable opening/closing arm 8, and a contact 9 is provided at the free end of the arm 8.

In the closing position, the contactor 9 comes into contact with a mating angle member 10 fixed to the opening/closing arm 1 of the disconnector by means of a spring force.

An ice-breaking device is provided to ensure that the high-voltage current path is grounded via the opening/closing arms 1 and 2 even during freezing.

FIGS. 2 and 2a show the mating contact 10 and the contact 9, which is constructed by stacking thin plates in this embodiment, before the circuit is closed.

The closed circuit direction is indicated by an arrow 11.

An ice-breaking device 12 is fastened to the mating contact 10 and has an ice-breaking edge 14 that bends elastically and extends beyond the contact surface 13 in the open position.

The ice-breaking edge 14 is biased by the contact 9 when in the closed position.

The ice-breaking edge 14 is composed of a U-shaped arcuate spring configured according to the contour shape of the contact surface 13 of the mating contact 10.

This arcuate spring is fixed to the free end 15 of the mating contact 10 and is movable within a permitted range near the stomper portion of the contact mount 16.

As is clear from FIGS. 3 and 4, the ice crushing device is provided on the side surface of the contact surface 13 in the illustrated embodiment.

However, it is also possible to provide a groove in the mating contact 10, into which a U-shaped arcuate spring or other elastically bendable ice breaking device is inserted.

The contact device according to the invention operates as follows.

That is, in the circuit-closing operation, when the contact surface of the contact 9 hits the contact surface 13 of the mating contact 10, it is pressed by the ice-breaking edge 14 of the U-shaped arcuate spring protruding from the contact surface 13. .

At that time, if there is ice on the contact surface of the contactor 9, break it and peel it off.

In the closed circuit position, both legs of the U-shaped arcuate spring are compressed, so that the contact surface of the contact 9 and the contact surface 13 of the mating contact 10 are in direct electrical conduction.

[Brief explanation of the drawing]

FIG. 1 is a side view of a high voltage disconnector according to the present invention, FIG. 2 is a side view of a mating contact equipped with an ice crusher according to the present invention, FIG. 2a is a partial side view of the contact, and FIG. is ■ in Figure 2
4 is a bottom view of the mating contact. 9... Contact, 10... Other contact,
12...Ice crushing device, 13...Contact surface.

Claims (1)

[Claims] 1. A high-voltage disconnector having an opening/closing arm provided so as to be able to rotate, a contact connected to the opening/closing arm that contacts a mating contact by a spring force in the closed circuit state, and an ice crushing device for when the contact surface of this contact is frozen. In a contact device for a device or a grounding switch, the ice-breaking device is fixed to a mating contact and has an ice-breaking edge that can be elastically bent out of the contact surface of the mating contact in an open state, and the ice-breaking edge is Contact device 0 for a high voltage disconnector or earthing switch, characterized in that it is pressed by a contact in a closed circuit state.