Enhancing type method for preventing electricity stealing and electric energy meter thereof

Abstract

The invention discloses an enhancing type method for preventing electricity stealing and electric energy meter thereof, which at least includes a voltage sampling circuit, a current sampling circuit, a power circuit, a special measuring ship, and also includes a current converter; when a zero line separates from an electric energy meter, the current converter converts a phase line current into a voltage to provide a work power for the special measuring chip through a double-power circuit; the special measuring chip automatically detects a zero falling signal and generates a voltage sampling signal used for measuring to lead the electric energy meter to be capable of measuring the voltage normally when falling off zero. The electric energy meter manufactured by using the method can effectively prevent the electricity stealing way of electric energy meter when falling off zero and enhance the performance of preventing electricity stealing.

Description

technical field [0001] The invention relates to an enhanced anti-stealing method and an electric energy meter thereof, belonging to the field of electric energy metering device manufacturing. Background technique [0002] At present, the anti-stealing technology of static AC active energy meters usually has the following two forms: [0003] Shunt + general metering integrated circuit; use μΩ order manganese copper resistance as the current source, which can prevent the stealing method of external short circuit, but it cannot prevent the stealing method of "one fire and one ground" at the output after the phase zero line is inverted. . [0004] Shunt + current transformer + dual-sampling metering integrated circuit; while the current transformer samples the current of the phase line and the current transformer samples the current of the neutral line, it can prevent the electricity theft of "one fire and one ground" at the output end after the phase and zero line are reversed...

AI Technical Summary

Problems solved by technology

[0003] Shunt + general metering integrated circuit; use μΩ order manganese copper resistance as the current source, which can prevent the stealing method of external short circuit, but it cannot prevent the stealing method of "one fire and one ground" at the output after the phase zero line is inverted.

[0004] Shunt + current transformer + dual-sampling metering integrated circuit; while the current transformer samples the current of the phase line and the current transformer samples the current of the neutral line, it can prevent the electricity theft of "one fire and one ground" at the output end after the phase and zero line are reversed. However, when the input drops the zero line, the meter cannot work due to the loss of working voltage, which cannot meet the requirements of still being able to measure

Based on this principle, some users often open the lead seal of the electric energy meter privately when using electric energy, and remove the zero line from the meter, so that the electric meter cannot measure electric energy, thereby achieving the purpose of stealing electricity

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