SU1325591A1 - Switching apparatus - Google Patents

Abstract

The invention relates to electrical engineering, in particular to switching devices of mine electrical networks. The purpose of the invention is superior power supply reliability and wider range of use. The device contains a safety device 1, a contact group 2 consisting of a fixed contact 3, an additional fixed contact 4 and a movable contact 5, a release 6 and 7, a protection unit 8 and a threshold element 9. The fixed contact 3 is held in a fixed position by the latch 10. Safety lock device 1 is in the form of exploding wire. 1 hp ff, 1 ill. with S ate Od 1C SP ate with

Description

eleven

The invention relates to electrical engineering, specifically to switching devices for mine electrical networks,

The purpose of the invention is to increase the reliability of power supply and expand the range of use of switching devices by reducing the number of fuses.

The drawing shows a diagram of the switching apparatus in single-line versions.

Switching device containing safety device 1; contact group 2, consisting of a fixed contact 3, an additional unsupported contact 4 and a movable contact 5, an independent and electrodynamic releasers 6 and 7, a protection unit 8 and a threshold e-element 9. A fixed contact 3 is held in a fixed position by a latch 10 built in in the switching device.

The device works as follows.

When a short-circuit occurs in the protected electrical network, the current of which is higher than the limit for a given type of com- puter unit, the protection block 8 and the threshold element 9 trigger at one time; The control signal from the protection unit 8 is applied to an independent rastsep ™ 6, under the influence of which the moving contact 5 is opened. Under the influence of the threshold element 9, an electrodynamic release 7 is activated, the rod of which acts on the latch 10, allowing the contact 3 to move. Contact 3 of the fixed pole comes in contact with an additional stationary contact 4, thus forming a chain of a stationary contact 3 additional stationary contact 4 of a safety device 1 shunting the contact group 2. In this circuit, a significant part of the electric arc energy is released, resulting in the switching device can disconnect short-circuit currents exceeding its switching capacity,

As safety device can be used

3912

fuses or samperengernoe limiters.

At high short-circuit currents, the efficiency of extinguishing an electric arc on the main circuit can be reduced by using as a safety device, a conductor whose parameters

() provide its electric

an explosion at the passage of a current exceeding the switching capacity of the device. With an electrical explosion of the conductor ggo is a cloud of vapor

5 of a metal that is electrically non-conductive. This cloud has an effective impact on the electric arc arising from contacts.

Q The protection unit 8 and trip switch 6 are commercially available products used in ore automatic switches and magnetic starters.

5 The electrodynamic release used in the apparatus is based on the interaction of electrodynamic repulsive forces arising between two conductors with counter currents.

Q positive direction.

Self-safety devices used as safety devices. Even limiters are based on the use of the properties of an alkali metal in a solid state to have good conductivity, and in a gaseous state - to have greater resistance.

The threshold element is a protection unit; able to serve

 a signal for the operation of the electrodynamic release when the short-circuit current is exceeded. higher breaking capacity of the applied switching apparatus. This unit can react not only to the magnitude of the current k, s ,, but also to the rate of its rise.

Connecting a safety device parallel to the power contacts through the additionally introduced fixed contact allows increasing the maximum breaking capacity of switching devices and reducing their number in ceTi-f, and consequently, increasing the reliability and safety of power supply systems while simplifying them.

Claims (2)

Claims 1. A switching apparatus comprising a contact group consisting five 0 five  1325591 from fixed and movable contact and auxiliary contact, connected to it by a safety device — connected in series with the safety device, a safety device and a parallel protection unit — different from the existing contact, but In order to increase the contact, the contact is provided with a latch for reliability of the power supply and expansion of it in a fixed penalty for the range of use of the switch. apparatuses by reducing 2. The apparatus according to claim 1, in which the number of fuses is specified, and with the fact that the fuse-contact group is equipped with an additional device made in the form entered by threshold device exploding wires.