Method for realizing high-precision measurement of residual current

A residual current, high-precision technology, used in measuring devices, measuring electrical variables, measuring current/voltage, etc.

Active Publication Date: 2020-05-01
浙江天正智能电器有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the deficiencies of the existing technology, the present invention provides a method that can realize high-precision measurement of residual current. The high-precision measurement method of residual current based on the Internet of Things solves these problems, and realizes small volume through digital curve fitting method. Residual current transformer measurement global coefficient calibration to achieve high-precision measurement, improve system operation safety and power continuity through the pre-judgment mechanism

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  • Method for realizing high-precision measurement of residual current
  • Method for realizing high-precision measurement of residual current
  • Method for realizing high-precision measurement of residual current

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Embodiment Construction

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0018] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relationship between the components in a certain posture (as shown in the accompanying drawings). Relative positional relationship, movement conditions, etc., if the specific posture changes, the directional indication also changes accordingly.

[0019] In the present invent...

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Abstract

The invention relates to a method for realizing high-precision measurement of a residual current. The method comprises the following steps that 1, the relationship between a secondary sensing voltagevalue detected by a transformer and an AD sampling value of a single-chip microcomputer is acquired; 2, a relationship is obtained through a cubic polynomial curve fitting by utilizing the secondary sensing voltage value detected by the transformer historically and the primary residual current value corresponding to the secondary sensing voltage value; 3, the secondary sensing voltage value of therelationship established in the step 2 is replaced by the AD sampling value, and the relationship between the AD sampling value and the primary residual current value is obtained; 4, the single chipmicrocomputer obtains the real-time primary residual current value according to the acquired AD sampling value; and 5, after the primary residual current value is obtained, determination is carried out, and the problem that the measurement precision is low due to the fact that the small-size residual current transformer measurement cannot be realized in a small intelligent switch system is solvedthrough the digital curve fitting method.

Description

technical field [0001] The invention relates to the field of electric power internet of things, in particular to a method for high-precision residual current measurement applied to a small intelligent switch system. Background technique [0002] The application of residual current protectors in power distribution systems is related to personal safety and continuity of power consumption. Insufficient residual current detection accuracy will cause the switching system to refuse to operate and threaten personal safety. Of course, it may also cause switch malfunction to affect the power distribution system. power continuity. The Ubiquitous Power Internet of Things requires that the data of the power distribution system be unified to form a network, and then through comprehensive calculation and analysis of the data in the middle and background of the cloud, the power distribution system can evaluate the operation of the system in advance, and the operating switch body system can...

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Application Information

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IPC IPC(8): G01R19/165G01R19/25
CPCG01R19/16571G01R19/2509
Inventor 李巍高平徐丽玲陶晓东陈平王松涛陈胜男
Owner 浙江天正智能电器有限公司
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