Novel lightning protection circuit for intelligent ammeter

A smart electric energy meter and lightning protection technology, which is applied to emergency protection circuit devices, circuit devices, and emergency protection circuit devices for limiting overcurrent/overvoltage, can solve problems such as remote meter reading, and avoid crashes Effect

Inactive Publication Date: 2015-04-01
李银龙
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  • Abstract
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Problems solved by technology

It adopts a two-stage composite lightning protection structure, which really has the effect of lightning protection during use, and avoids problems such as crashes caused by lightning strikes and other factors, and remote meter reading cannot be performed.

Method used

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  • Novel lightning protection circuit for intelligent ammeter

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Embodiment Construction

[0012] 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 making creative efforts belong to the protection scope of the present invention. Additionally, the protection scope of the present invention should not be limited only to the following specific structures or components or specific parameters.

[0013] The design scheme of the present invention is: a two-stage composite lightning protection structure is adopted, that is, a gas discharge tube is used as the first-level lightning protection at the input port, and a thermistor plus a transient voltage suppression diode is used as th...

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Abstract

The invention provides a lightning protection circuit for an intelligent ammeter, which employs a two-stage composite lightning protection structure. That is to say, an input port employs gas discharge tubes as primary lightning protection; an output port employs a thermistor and a transient voltage suppression diode as secondary lightning protection; the primary lightning protection is formed by the two gas discharge tubes, carries out common mode protection and differential mode protection, reaches 10KV/500A in through-current capability and can reduce voltage to about 500V; the secondary lightning protection is formed by the thermistor PTC and the TVS (transient voltage suppression) diode; the thermistor exerts a current limiting effect; and after secondary limiting by the TVS diode, the voltage is suppressed at about 6.8V, so that a 485 module circuit is protected. The circuit employs the two-stage composite lightning protection structure, the lightning protection effect is exerted in deed in a use process, and the problems of halt and failure in remote meter reading due to factors such as a lightning stroke are avoided.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic measurement, and in particular relates to a lightning protection circuit for an intelligent electric energy meter. Background technique [0002] In order to realize intelligent power consumption, the electric energy meters are equipped with RS485 communication interface, which can realize remote meter reading and control. For example, in Chinese Patent Application No. 201110208655, a single-phase remote charge control smart energy meter with RS485 control signal output is disclosed, which includes a metering circuit, a processing circuit and an interface circuit, and the signal output or input terminal of the metering circuit and the processing circuit The No. 1 signal input or output terminal of the processing circuit is connected to the signal output or input terminal of the interface circuit; the metering circuit includes a voltage sampling circuit, a No. 1 current sampling circuit, a N...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/04H02H9/06H02H9/02
Inventor 李银龙马华李双李宝英
Owner 李银龙
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