Timing anti-creeping device and method for electric energy metering

Abstract

The invention relates to a timing anti-creeping device and method for electric energy metering, and the device comprises a power integration unit which is used for receiving power metering values, carrying out the accumulation of inputted power metering values and generating an enabling signal according to an accumulation result; a fixed pulse width unit which is connected with the power integration unit, and is used for receiving the enabling signal and outputting a verification pulse; a control unit which is connected with the power integration unit and the fixed pulse width unit, is used for receiving the verification pulse, outputting a first zero clearing signal to the fixed pulse width unit and outputting a second zero clearing signal to the power integration unit, and also comprises a counter; and a timing unit which is connected with the counter of the control unit and is used for outputting a timing pulse to the control unit. In addition, the invention also relates to the timing anti-creeping method for electric energy metering. The device and method can achieve an anti-creeping function in electric energy metering at lower cost through simple control logic.

Description

technical field [0001] The invention relates to a timing anti-creep movement device and method for electric energy metering. Background technique [0002] Creeping motion in electric energy measurement refers to the phenomenon that the voltage circuit is connected with 115% Un voltage, the current circuit has no current, but the metering output pulses, and the electric energy meter moves or rotates. The noise and error of the mechanical system of the electric energy meter and the metering chip are the main reasons for this phenomenon. They cause tiny signals in the current circuit. After a long period of accumulation, pulses will be generated and creep will occur. The creep in electric energy metering brings unnecessary economic losses. [0003] At present, the anti-creeping methods in the electric energy metering chip are mainly realized based on the power threshold, based on the magnitude of the effective value of the current, and based on timing energy clearing. The met...

AI Technical Summary

Problems solved by technology

The method of realizing electric energy anti-creep based on the power threshold is: first preset an anti-creep threshold, when the absolute value of the input power is not less than the anti-creep threshold, the direct output power is used for subsequent power integration, and when the absolute value of the power When the value is less than the anti-creep threshold, the output is "zero", so that the subsequent power integral is zero, that is, the energy is zero, and there is no pulse output, which plays the role of anti-creep; however, this method has defects, in this method The anti-creep threshold is equivalent to the value of noise, but the noise in the real environment is often variable. Even in the same environment, the noise value of different meters is different. If the threshold is too large, the effective energy will be ignored, resulting in metering Error, too small, can not achieve the anti-creep function, so the anti-creep threshold is difficult to determine

[0004] For the method of realizing electric energy anti-creep based on the effective value of current, it is to judge whether the energy measured currently is valid by the value of the effective value of the current. In order to realize the correct judgment, it is necessary to add a complex circuit to improve the accuracy of the effective value of the current. The method also has the above-mentioned problem of realizing anti-creep based on the power threshold, that is, it is impossible to determine the size of the noise value

[0005] Realizing electric energy anti-creep based on timing energy clearing is to clear the energy every preset time, so as to ensure that there is no pulse output when there is no load current. This method is effective and feasible most of the time, and is obtained by the metering chip. It has been widely used, but in the current design, this method has the problems of complex system design, large resource consumption, and high implementation cost. In some designs, there will be an extra pulse, which is not allowed in electric energy metering.

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