High-frequency high-voltage interference electric larceny detecting device based on acoustic signal

Abstract

The invention discloses a high-frequency high-voltage interference electric larceny detecting device based on an acoustic signal. The device comprises a pickup, a conditioning circuit, a threshold value comparison circuit and a repeatable triggering monostable delay circuit. The pickup, the conditioning circuit, the threshold value comparison circuit and the repeatable triggering monostable delaycircuit are sequentially in serial connection, and after a signal is picked by the pickup, three layers of processing performed by signal conditioning, the threshold value comparison circuit and the repeatable triggering monostable delay circuit are conducted on the signal to ensure that an early-warning signal is transmitted when a high-frequency high-voltage interference electric larceny behavior occurs and an interference electric larceny intensity is achieved. By means of the device, the damage of high-frequency high-voltage interference on the device can be effectively prevented, the reliability is high, each section is composed of mature circuits constructed by common components, the construction cost is low, all circuits adopt conventional electronic circuits, the structures of thecircuits are simple, and the device is suitable for the installation of compact space of various kinds of measuring boxes.

Description

technical field [0001] The invention relates to the field of detection and sensing, and more specifically, to a high-frequency and high-voltage interference electricity stealing detection device based on sound signals. Background technique [0002] In recent years, due to the advantages of high accuracy, low power consumption, small starting current, wide load range, and no mechanical wear, electronic energy meters are more and more widely used than inductive energy meters. The phenomenon of high-tech smart electricity theft for electronic energy meters emerges in an endless stream. The means of electricity theft has also developed from traditional wiring modification and destruction of metering devices to non-contact electricity theft by using advanced high-frequency and high-voltage interference electricity-stealing devices. Due to the concealment of this kind of electricity stealing means, the electricity stealing behavior is difficult to be found, so the electricity stea...

AI Technical Summary

Problems solved by technology

Because this electromagnetic radiation has the characteristics of short time, energy concentration and instantaneous high voltage, this kind of interference often generates interference pulses in the vulnerable parts of the electronic energy meter circuit, causing the key components of the metering chip to deteriorate, thus affecting The normal operation of the electronic circuit will affect the normal measurement of the electronic energy meter to achieve the purpose of stealing electricity

For this kind of stealing method, there are currently some detection devices based on electromagnetic sensors, but because such devices are directly measured by electromagnetic radiation induced by high-frequency and high-voltage interference, they themselves are also vulnerable to damage, so this method is often used Electricity stealing behavior is not detected, but additional detection device loss is increased, and the actual application effect is poor

Moreover, this type of device cannot distinguish between the electromagnetic radiation of the load switch electrical equipment around the electric energy meter and the electromagnetic radiation of high-frequency and high-voltage interference and stealing electricity, and the false alarm rate is high.

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