Zero line falling electricity larceny prevention metering device based on reset prevention device

Abstract

The invention discloses a zero line falling electricity larceny prevention metering device based on a reset prevention device. The metering device comprises a voltage sampling circuit, a current sampling circuit, a voltage channel ADC sampling pin, a current channel ADC sampling pin, a power failure detection pin, an analog comparator pin, an analog comparator circuit, a power failure detection circuit, an AC-DC circuit, a DC-DC circuit, a voltage transformer circuit and a metering microcontroller. An analog comparator function is added in the circuit, when the system operates, an output stateswitch of an analog comparator is turned on, the output state of comparison between the positive input end signal of the comparator and the REF end signal of a chip is read in an analog circuit stateregister, and whether the system carries out electricity stealing metering or dormancy metering is distinguished. The problem that the system is continuously reset and restarted due to insufficient power consumption of the whole system when the voltage coupled by the PT is in a critical point state is solved, and the normal metering of the system in each state is ensured.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to an anti-stealing electricity metering device for zero line drop based on an anti-reset device. Background technique [0002] Single-phase watt-hour meters are often used to measure the electricity consumption of household users. Some criminals remove the live wire or neutral wire of the meter, so that the meter will have no power supply and the meter will not be able to measure normally. In order to prevent electricity theft, the existing technology adopts zero line anti-theft measurement, that is, the electricity thief removes the neutral line (N) on the electric energy meter, and the electric energy meter has no power supply. At this time, the voltage transformer PT is used to The current loop is coupled with the voltage to obtain the power supply, and the SOC is used to read the effective value of the current for measurement, which is an anti-theft means. [0003] In ...

AI Technical Summary

Problems solved by technology

Although this method can perform metering when electricity theft occurs, when the current is around 1A, the coupling voltage of the voltage transformer PT will cause insufficient power supply as the power consumption of the system increases, causing the system to enter dormant metering, and dormant metering will Reduce the power consumption of the system, the coupling voltage of the voltage transformer PT wakes up the system from the dormant state again, and performs zero line measurement, which leads to the continuous reset and restart of the anti-theft system device

This situation will cause the entire meter to not perform power accumulation during the period of reset and restart, or the power accumulation will decrease.

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