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Method and system for rapidly detecting residual current of intelligent electric meter

A residual current and smart meter technology, applied in the field of electrical detection and alarm, can solve the problems of low calculation accuracy affecting alarm accuracy, slow measurement speed, etc.

Pending Publication Date: 2021-08-31
CHINA SOUTHERN POWER GRID DIGITAL GRID RES INST CO LTD +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the problems that several whole waves need to be detected in the residual current monitoring method in the prior art, the measurement speed is slow, the effective value is obtained through the comparison method, and the low calculation accuracy affects the alarm accuracy, and provides a high detection accuracy and alarm speed. Fast and high-accuracy smart meter residual current rapid detection method and system

Method used

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  • Method and system for rapidly detecting residual current of intelligent electric meter
  • Method and system for rapidly detecting residual current of intelligent electric meter
  • Method and system for rapidly detecting residual current of intelligent electric meter

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Embodiment

[0029] Such as Figure 1~4 A method and system for rapid measurement of residual current shown, including a current transformer, a main controller, a temperature sensor, and an alarm. The current transformer, temperature sensor, and alarm are all connected to the main controller, and the main controller Including a relay and a metering chip, the current transformer penetrates the L-phase current from the upper end to the lower end, and passes the N-phase current from the lower end to the upper end, then the current transformer is equivalent to measuring the vector sum difference between L and N. Because the sampled directly is the vector sum, the basic characteristic requirements of fast leakage current calculation can be completed; the temperature sensor obtains the temperature information around the residual current detection device and transmits it to the single-chip microcomputer; the metering chip adopts a wide dynamic range, high sampling speed, and supports waveforms me...

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Abstract

The invention discloses an intelligent electric meter residual current rapid detection method and system. The method is characterized in that the method comprises steps of obtaining a 1 / 4 waveform current instantaneous value through sampling; and a residual current effective value IE being obtained through a rapid waveform sorting algorithm. The rapid waveform sorting method comprises steps of sorting a current instantaneous value of a 1 / 4 waveform into a whole-cycle waveform and then calculating an effective value Ie through an effective value algorithm; a step of obtaining the residual current effective value IE further comprises a step of performing temperature compensation on the Ie and then outputting the Ie; an effective value being calculated based on a 1 / 4 waveform, and the residual current alarm speed being improved; through a symmetric algorithm, extreme value judgment and an effective value algorithm, accuracy of residual current detection being improved. The method is advantaged in that the temperature compensation current is calculated for environment temperature detection and is compensated to the residual current effective value, so temperature adaptability is improved, and alarm accuracy is further improved.

Description

technical field [0001] The invention relates to the field of electrical detection and alarm, in particular to a method and system for quickly detecting residual current of an intelligent electric meter. Background technique [0002] Residual current refers to the current in which the vector sum of the current vectors of each phase in the distribution line is not zero. In most cases, it is caused by the leakage of equipment or lines. When the leakage is serious, it will burn the electrical equipment or lines and cause a fire. Therefore, it is an effective protective measure to prevent personal electric shock, electrical fire and electrical equipment damage by residual current detection and installation of residual current operating protectors in low-voltage power grids. The residual current monitoring method in the prior art is to obtain the effective value of the live line current and the neutral line through the metering chip, and subtract the effective value to obtain the ...

Claims

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Application Information

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IPC IPC(8): G01R35/04G01R19/00G01R19/32
CPCG01R35/04G01R19/0092G01R19/32Y04S10/52
Inventor 张本松周尚礼何恒靖张鑫
Owner CHINA SOUTHERN POWER GRID DIGITAL GRID RES INST CO LTD
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