Fault recording method of electric energy meter and electric energy meter

Abstract

A fault recording method of an electric energy meter comprises the steps that a metering chip samples voltage or current waveforms and calculates a sampling value of each half waveform period in realtime to obtain a half-wave effective sampling value; when the half-wave effective sampling values are not in the set threshold range, fault recording is triggered, the metering chip stores all the half-wave effective sampling values within a period of time before and after the fault recording is triggered in a cache, and a fault recording mark is given; when the management chip inquires that the fault recording mark exists, the management chip reads fault recording data from the cache, the mark is removed after data reading is completed, and the management chip processes each half-wave effective sampling value to obtain a half-wave effective visual value; the management chip stores the half-wave effective visual value, the fault recording time and the ID of the fault recording channel intoa memory; and a user reads fault recording data through a COSEM interface. The invention also discloses an electric energy meter. The method is high in working efficiency and can record fault data for a longer time.

Description

technical field [0001] The invention relates to the field of electric energy meters, in particular to a fault wave recording method for electric energy meters and the electric energy meter. Background technique [0002] With the development of society and the continuous improvement of the level of science and technology, the equipment used in the power grid system is becoming more and more advanced and more and more types. The diversification of electrical equipment will inevitably lead to an increase in the nonlinear load of the power grid, which also leads to the increasingly serious power quality problems such as voltage and current waveform distortion, harmonics, and imbalance in the power grid. These problems will eventually bring bad experience to users' electricity usage, and sometimes even cause serious damage to our economy, all of which put forward higher requirements for power companies to monitor the quality of power grids. Therefore, power quality monitoring ha...

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Problems solved by technology

[0003] For power quality measurement, many international and domestic standards have been released, including IEC 61000-4-30, IEC61000-4-7, IEC 61000-4-15, GBT12326, GBT15543, GBT30137, etc., among which the IEC61000-4-30 standard defines Many parameters related to power quality, including harmonics, flicker, system unbalance, RVC, voltage transient and other parameters, in order to obtain these parameters also involve many methods, including analysis of harmonics, interharmonics, subharmonics The Fourier series method for wave and high-frequency harmonics, the symmetrical component method for analyzing the three-phase unbalanced system of electric meters, etc. These parameters can accurately reflect the quality of electric energy, but it is relatively not so easy to understand these parameters. Understanding the power quality reflected by these parameters may require relevant professional content, which is not practical for ordinary users

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