AC non-arc switch electric appliance

Abstract

The present invention relates to an AC non-arcing switch electric equipment, including conductor series-connected in its main circuit, iron core which are formed into the out-of-phase induced current generator with the said conductor together, main winding, auxiliary winding and phase-shifting element, executive main contact point of switch and control circuit with the function of self-locking by utilizing working current induction and automatic unlocking after the working current is passed through zero. Said invention also provides its working principle, and under the condition of non-producing electric arc it can cut off the power supply of working circuit.

Description

Technical field: [0001] The invention relates to an AC arcless switching device. Background technique: [0002] The work of the switch is to turn on or off the working circuit. The arc generated when the circuit is turned off and its extinguishment are the main problems faced by the switch. The larger the capacity, the more difficult it is to extinguish the arc. Therefore, extinguishing the arc is a technical problem of the switch. center and key. Existing switching appliances focus on "arc extinguishing", that is, when the switching appliance shuts off the circuit and generates an arc, try to extinguish it. The best time to extinguish the arc in the AC circuit is to turn off the switching device when the AC current crosses zero. The operating frequency of the power grid is generally 50HZ or 60HZ, that is, the current must cross zero 100 or 120 times per second. Since the current zero-crossing time is extremely short, it is difficult to realize the shutdown at this instant...

AI Technical Summary

Problems solved by technology

[0003] Therefore, the current basic contradiction is: although the detection speed of electronic technology is very fast and the precision is very high, it can quickly detect the zero-crossing point of the current in the circuit and give feedback, but the mechanical action mechanism cannot accurately move at the zero-crossing point. If there is a deviation, it is possible to turn off near the current peak value, resulting in a large arc and making it difficult to extinguish the arc.

For three-phase AC switching appliances, which are more widely used than single-phase AC switching appliances, the phase sequence of the three-phase AC currents differs by 120°, and it is impossible to cross zero at the same time, which brings greater difficulties to arc extinguishing

[0004] At present, power electronic devices are developing rapidly. Although they can meet the requirements in terms of detection and shutdown speed, due to the large power consumption of components when the circuit is turned on, especially when high voltage and high current are used, the problems of power consumption and heat dissipation are prominent, and there are costs. High, reliability is not as good as traditional switching appliances, so it cannot replace traditional switching appliances

[0005] To sum up, the main point of the AC switching device is to reliably shut off the circuit when the current crosses zero. The existing AC switching device has an unsatisfactory arc extinguishing effect due to the above-mentioned various reasons.

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