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Electric shock protection method

A technology for electric shock protection and electric shock current, applied in emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, emergency protection devices for automatic disconnection, etc., can solve the problem of distinguishing between electric shock signals and residual current signals The accuracy rate is not high, the action dead zone of the protector, etc., to improve the accuracy and practicability, and improve the accuracy

Inactive Publication Date: 2010-05-12
SHANGHAI SAIFUKCL ELECTRICAL APPLIANCE
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Problems solved by technology

[0006] Aiming at the problem that the existing residual current protector has low accuracy in distinguishing the electric shock signal and the residual current signal, and the protector has an action dead zone, it proposes a high-accuracy method for distinguishing between the electric shock current of animals and the residual current signal. The method of residual current, and this method is used to realize electric shock protection, and the electric shock protector realized based on this method has no action dead zone

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Embodiment Construction

[0018] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.

[0019] The national standard GB / T13870.1-92 clearly states that the impedance of the human body is determined by factors such as the current path, contact voltage passing time, frequency, skin humidity, contact area, applied pressure and temperature. The total body impedance is composed of skin impedance and body impedance. When the contact voltage is higher, the total impedance of the human body is less and less dependent on the skin impedance. When the skin is broken down, the total impedance value is close to the internal impedance. At present, the residual current protection devices at home and abroad are all based on the stable current after the human body gets an electric shock, and ignore the skin impedance transformation during the skin...

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Abstract

The invention discloses an electric shock protection method which realizes the electric shock protection by distinguishing electric shock currents of animals from remaining currents depending on the distinguishing characteristics that wave forms of the electric shock currents of animals are gradually-amplified nonlinear waveforms within 3-4 half-wave time at the beginning of electric shock, and the amplitude of the waveforms is increased according to certain difference. The method can raise the accuracy in judging the electric shock of animals from current 60% to over 80%, and can remarkably enhance the precision and the practicability of an electric shock protection device.

Description

Technical field: [0001] The invention relates to a method for electric shock protection, in particular to a method for realizing electric shock protection by distinguishing animal electric shock current and residual current. Background technique: [0002] According to the regulations of GB13955-2005 and DL493-2001, the residual current protection device is one of the safety technical measures that must be taken in the rural power grid. [0003] However, at present, the residual current protection devices at home and abroad all use the magnitude of the residual current as the basis for the protection device to operate. That is, as long as the residual current in the circuit (or sudden appearance) reaches the predetermined value of the protection device, it will act; otherwise, it will not act. The result is that the device used for ground fault protection should have a large action value and cannot protect human life; the protection device that can protect human life is too ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/32H02H5/12H02H9/02
Inventor 陈策沾黄顺喜胡运棠曹彬彬
Owner SHANGHAI SAIFUKCL ELECTRICAL APPLIANCE
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