Electricity larceny prevention circuit capable of detecting short-circuiting of electric energy meter

Abstract

The invention discloses an electricity larceny prevention circuit capable of detecting the short-circuiting of an electric energy meter. The circuit comprises a voltage sampling circuit, a current sampling circuit, a division operation circuit, a threshold value comparison circuit, a fault-tolerance circuit and a result display circuit; the voltage sampling circuit is arranged at the current wiring end of the electric energy meter and is used for collecting the voltage of the current wiring end of the electric energy meter and converting the alternating current voltage into a valid value; thecurrent sampling circuit is used for collecting the current of the secondary loop of a current transformer and converting the alternating current into a valid voltage signal; the division operation circuit performs division operation on the collected voltage signal and current signal to obtain the equivalent voltage signal of the resistance of the current coil of the electric energy meter; and thethreshold value comparison circuit is connected with the division operation circuit and is used for comparing the measured resistance equivalent signal with a set threshold value, and judging whethershort-circuiting and electricity larceny occur. With the circuit of the present invention adopted, a condition of electric energy meter short circuiting-based electricity larceny and no consumption of electricity of a user can be distinguished from each other accurately; and the short-circuiting of the current transformer can be judged on the basis of resistance change during the short-circuitingof the electric energy meter.

Description

technical field [0001] The invention relates to an anti-stealing electric circuit, in particular to an anti-stealing electric circuit for detecting short-circuit electric energy meters. Background technique [0002] In the context of rapid economic development, the demand for electricity is increasing day by day, and the expansion of the electricity sales market has stimulated the development of the entire electricity production. However, with the development of the economy and the increase of electricity consumption, especially with the establishment of the market economy system, the problem of stealing electricity has become more and more prominent, and the country has suffered huge economic losses for this reason. The problem of stealing electricity not only plagues the development of electric power enterprises, but also seriously affects the country's economic construction and social stability. [0003] The metered electric energy depends on the product of voltage, curr...

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Problems solved by technology

[0007] (4) Short circuit electric energy meter

The secondary circuit of the open-circuit current transformer can be judged by detecting whether the voltage on the secondary side of the current transformer is abnormal, but for the short-circuited electric energy meter, there is no stable and reliable solution because it is easy to be confused with the user's power-free situation.

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