Method for extracting explosion-continuous short circuit signal

Abstract

Provided is a method for extracting an explosion-continuous short circuit signal. The method is characterized by utilizing the features of an instantaneous positive and negative pulse current which is produced at an explosion point during short circuiting, and thus extraction of the explosion point signal is realized; and combining a leakage protector to control short-circuit burning. Therefore, the short-circuit burning, which is caused for the reason that a short-circuit current is not large enough to enable an air short-circuit switch to trip, is performed an automatic circuit-breaking control, and electric fire cases can be reduced; the original leakage protector is combined, so that circuit control is simple and the cost is low; and thus the method is an ingeniously-designed, highly-practical anti-electric fire technical scheme.

Description

technical field [0001] The invention belongs to the field of fire protection, and in particular relates to a method for extracting continuous explosion short-circuit signals. Background technique [0002] Electric fire is generally caused by the aging (or poor quality) of the wire, which first causes leakage, and then forms a leakage resistance to generate heat. The heat accelerates the aging of the insulating layer plastic, and finally peels off, causing the two wires to gradually move closer together, and finally the two wires are short-circuited. The wire aging short circuit can be divided into three situations: the first is the short circuit with a large cross-section of the wire, and the passing current is also large (such as a copper wire with a cross-section of 1 square millimeter, the short-circuit current can reach 104A), so as long as the fuse or air circuit breaker If it is good, it can trip in time and will not cause fire; the second is a short-circuit with a sma...

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Problems solved by technology

It is worth noting that the electric fire caused by this continuous explosion type short circuit is often sudden. It often occurs at night when people do not use electrical appliances. A short circuit occurs suddenly; and because there are few electrical appliances in the middle of the night, even if the pulse current is high, the total current value flowing through the air switch is also low, and the switch is not easy to trip

Because this kind of fire is very hidden, the short-circuit melting mark is often damaged after the fire, and it is difficult to attract people's attention. Therefore, although the continuous explosion short-circuit fire is the culprit of the electric fire, how to prevent the occurrence of the continuous explosion short-circuit fire is not discussed by people. not much

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