SU1339683A1 - Arc chute with deion grid - Google Patents

Abstract

The invention relates to electrical engineering, in particular, to arcing chambers of current-limiting contact devices connected in series with automatic switches. The aim of the invention is to increase the efficiency of arc suppression. The arcing chamber consists of a row of plates 1 with a U-shaped notch fixed to each other n-hell in the walls 2. The plates 1 and the LJ-shaped notch are made of electrically insulating material, and their ends along the entire length are enclosed by brackets 3 of ferromagnetic material. When the current of the circuit is disconnected by a current-limiting device with an automatic switch, the electric arc, moving along the arcing horns, approaches the ends of the plates 1 within the LJ-shaped notch. In contact with the brackets holding these ends 3, the arc begins to cool intensively, as a result of which the voltage drop across it increases. Since the shutdown current of the closing current-limiting device and the circuit breaker is short, the electric arc only has time to come into contact with the ends of the plates 1. Because in the mode of nominal currents and overload currents, the current-limiting devices do not participate in the outage only the ends of the plates 1 of the arc chambers play. 1 h. item f-ly, 1 ill. (L co co O O5 00 co

Description

The invention relates to electrical engineering, in particular to arcing chambers of current-limiting contact devices connected in series with automatic switches.

The purpose of the invention is to increase the arc suppression efficiency by providing a high voltage gradient on the electric arc by turning off short-circuit currents while reducing metal intensity.

The drawing shows an arc suppressor — a camera, an objei view.

The loam-suppressing chamber contains a package of plates 1 made of an electrically insulating material with a lj-cut, secured in electrically insulated pion walls 2. The ends of the plates, forming a U-shaped cut, are tied with brackets 3 of a ferromagnetic material.

Arc camera works as follows.

When the short-circuit current is disconnected by a current-limiting device, the electric arc, moving with arc-suppressing horns (not shown), approaches the brackets 3 that enclose the insulating clamps of the cores 1, within the U-shaped notch. When the electric arc touches the brackets 3, it is intensively cooled against the ends of the brackets, and the plasma surrounding the electric arc column is directed inside the arcing chamber. At the same time, from 1, the plates 1 of the de-ionic lattice prevent the ignition of an electric arc behind the brackets 3.

Due to the presence of staples 3, vyyul1n; npykh from ferromagnetic | C) matter. 1a, in the b-shaped notches of the insulating nlastins 1, the contact area of the hundred increases. 1b the electric arc with the ends of the brackets 3, takes place within the limits of the lJ-shaped notch, which leads to the penetration I pa

0

five

five

0

0

voltage on the electric arc and the improvement in arc efficiency.

Due to the fact that when the short-circuit currents are disconnected in current-limiting devices, the electric arc burning time is short, and the electric arc entry time into the ion grid is comparable with the electric arc burning time, the plates 1 behind the.-Shaped cut-out zone do not actually participate in the electric arc process, which allows to reduce the meta: 1; 1 capacity of the arc-suppressing chamber due to the performance of the ferromagnetic brackets 3 only within the end surfaces of the plates I, forming a lJ-shaped notch.

To improve the manufacturability and mechanical strength of the insulation plates 1 and the walls in which they are fixed, they can be made in one piece.

Claims (2)

1. An arresting chamber with a de-ionic lattice consisting of a series of plates with an i-shaped notch fixed above each other in the walls of an electrically insulating material, characterized in that in order to increase the efficiency of the arc suppression by providing a high When the short-circuit currents are disconnected while the metal intensity is reduced, the LI-shaped plates are made of electrically insulating material, and the ends of these plates, which form an L-shaped notch, Staples made of ferromagnetic material. 2. The chamber according to claim 1, characterized in that, in order to increase the manufacturability and mechanical strength, the walls and plates of the arc chambers are made 1 1 in one run.