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Electric energy meter and anti-steal circuit thereof

The utility model relates to an electric energy meter and a technology for preventing electricity theft, which is applied in the field of electric energy meters and electric theft prevention circuits, and can solve the problems of inability to accurately detect the connection state of the secondary side of a current transformer and the like.

Inactive Publication Date: 2013-01-09
陈志伟
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide an electric energy meter anti-stealing circuit, which aims to solve the problem that the existing anti-stealing technology cannot accurately detect the connection state of the secondary side of the current transformer

Method used

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  • Electric energy meter and anti-steal circuit thereof
  • Electric energy meter and anti-steal circuit thereof
  • Electric energy meter and anti-steal circuit thereof

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Embodiment Construction

[0016] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0017] figure 1 The block diagram of the anti-stealing circuit provided by the embodiment of the present invention is shown. For the convenience of description, only the parts related to the embodiment of the present invention are shown, and the details are as follows:

[0018] The electric energy meter anti-stealing circuit 100 is connected with the external power calculation circuit 200, including a current transformer 101, and the secondary side 300 of the current transformer 101 is connected with the inductance L5 for accessing the alternating current, and the electric energy meter is anti-stea...

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Abstract

The invention provides an electric energy meter and an anti-steal circuit thereof, which belong to the field of power and electron measurement. According to the invention, the anti-steal circuit of the electric energy meter is formed by adopting a filtering unit, a waveform adjustment unit and a microprocessor at a power terminal to be matched with a current transformer. The anti-steal circuit detects frequency changes of secondary output rectangular pulse waves of the current transformer, and accurately judges the connection status of the secondary side of the current transformer so as to achieve the aim of completely monitoring the electricity stealing action when an alternating current at a secondary side of the current transformer is at a zero-crossing point zone of the alternating current, so that the problem that the existing electricity stealing prevention technology can not accurately detect the connection status of the secondary side of the current transformer can be solved.

Description

technical field [0001] The invention belongs to the field of power electronic metering, in particular to an electric energy meter and an anti-stealing circuit thereof. Background technique [0002] At present, in the power system, stealing electricity by short-circuiting the secondary side of the current transformer in the power terminal is a common method of stealing electricity. [0003] In order to be able to detect electricity theft, the existing anti-theft technology is to add a coupling coil to the current transformer, use the coupling coil to detect the change of inductive reactance of the secondary side circuit of the current transformer, and pass the inductive reactance change Judging the connection status of the secondary side of the current transformer, so as to know whether electricity stealing has occurred. However, in the above-mentioned anti-stealing technology, the magnetic medium in the coupling coil will change its magnetic permeability with the change of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R11/24
Inventor 陈志伟
Owner 陈志伟
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