Low voltage current-limiting breaker based on forced air explusion

A low-voltage current limiting and forced airflow technology, applied in the field of current limiting, can solve the problems of long time for the arc to stay in the contact area, loss of contact material, high cost, etc., to shorten the current breaking time, increase the arc voltage, Increase the effect of convective heat transfer

Inactive Publication Date: 2005-01-12
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
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Problems solved by technology

However, while the superconducting current limiting technique works well, it is expensive and not suitable for general industrial applications
[0005] The method of using the arc striker is to use the electromagnetic force generated by the arc striker to elongate the arc and drive it into the arc extinguishing chamber. The recovery speed of the dielectric strength in the head g

Method used

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  • Low voltage current-limiting breaker based on forced air explusion
  • Low voltage current-limiting breaker based on forced air explusion
  • Low voltage current-limiting breaker based on forced air explusion

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Embodiment Construction

[0017] The structural principle and working principle of the present invention will be further described in detail below with reference to the accompanying drawings.

[0018] see figure 1 , 2, the present invention includes an arc-extinguishing chamber 1 and an arc-extinguishing grid 2 arranged in the arc-extinguishing chamber 1. The lower end of the arc-extinguishing grid 2 is respectively provided with a moving contact 3 and a static contact 8, and the static contact 8 The stationary contact bracket 9 that can rotate around the axis O6 is connected to the fixed bracket 19, and a stationary contact return spring 18 is also arranged between the stationary contact bracket 9 and the stationary bracket 19, and the lower end of the stationary contact 8 is provided with a Cylinder 23, the air outlet 20 of the cylinder 23 is located directly below the static contact 8, the piston 22 of the cylinder 23 is provided with a piston valve hole 24 and a valve 21 arranged on the piston valv...

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Abstract

Breaker include quenching pot, quenching grating and blowoff of flames unit composed of piston, jet orifice, cylinder, kinematic link, power spring and pull rod. Kinematic link transfers force to piston. Cylinder, piston, and jet orifice constitute a semitight air chamber. Only jet orifice in whole air chamber keeps connection with air chamber. In time of switching on/off operation of the breaker, under action of kinematic link gear, the piston does reciprocal motion along cylinder wall surface in the air chamber. Thus, blowing to electric arc, forcible airflow generated at jet orifice increases heat convection of air in quenching pot, cools and stretches electric arc so as to reach purpose of shortening time of cutting off current and increase voltage of electric arc.

Description

technical field [0001] The invention relates to a current-limiting technology applied to a low-voltage circuit breaker, in particular to a low-voltage current-limiting circuit breaker based on forced airflow blowing arc. Background technique [0002] Current-limiting breaking technology occupies a very important position in the switchgear industry, and excellent current-limiting performance is an indispensable part of switchgear. By enhancing the current limiting performance, the breaking capacity of the circuit breaker can be greatly improved. The problem of current-limiting breaking of low-voltage circuit breakers requires that the breaking time of the circuit breaker be short enough that the short-circuit current is interrupted before it reaches its expected peak value. In principle, the current limiting technology of low-voltage circuit breakers mainly includes: the contacts open quickly to shorten the current breaking time, increase the breaking circuit resistance and ...

Claims

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Application Information

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IPC IPC(8): H01H9/30H01H73/18
Inventor 荣命哲吴翊
Owner XI AN JIAOTONG UNIV
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