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Device and method for residual current protection

A technology of residual current and leakage current, applied in the direction of emergency protection circuit device, circuit device, automatic disconnection emergency protection device, etc.

Active Publication Date: 2015-04-01
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Therefore, the existing RCD with external trigger function can not meet the safety requirements, thus a new type of RCD with external trigger function is needed to avoid unnecessary personal electric shock injury

Method used

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  • Device and method for residual current protection
  • Device and method for residual current protection
  • Device and method for residual current protection

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Embodiment Construction

[0020] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described with reference to the accompanying drawings.

[0021] figure 2 A schematic diagram of an existing RCD with an external trigger function is shown. Such as figure 2 As shown, the RCD 200 includes a leakage detector 210 (such as a zero sequence current transformer ZCT (Zero order current transformer), a control circuit 220 (such as a microcontroller MCU, or such as a control chip produced by Mitsubishi, etc.), including a trip Trip device 230 with coil 231 and thyristor 235 , and external input circuit 240 .

[0022] exist figure 2 Among them, the leakage detector 210 detects whether there is a leakage current on the live line L and the neutral line N in the line. The leakage current detector 210 sends the detected leakage current signal to the control circuit 220 (pins 1...

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PUM

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Abstract

The invention provides a device and a method for residual current protection. The device comprises a leakage detector, a trip device and a control circuit, wherein the control circuit is used for generating a driving signal to enable the trip device to execute tripping action when leakage current is detected by the leakage detector. The device further comprises an outside input circuit which is used for responding to outside input to generate a trigger signal, the control circuit responds to the trigger signal and sends the driving signal out, a power source of the outside input circuit and a power source obtaining electricity from a power supply circuit are electrically isolated, and signals of the outside input circuit and the control circuit are electrically isolated. By means of double isolation of power sources and signals, the outside input circuit can be partly or completely isolated from the power supply circuit. Consequently, high voltage is not applied on an outside input button even if elements short out due to faults, so that safety of operators is guaranteed.

Description

technical field [0001] The invention relates to a residual current protection device, in particular to a residual current protection device with an external trigger function. Background technique [0002] In the low-voltage power grid, when the operator touches the live part of the electrical device, a leakage current will be generated, which may easily cause personal electric shock casualty accidents. Or, when the insulation of electrical devices in the low-voltage power grid is poor, there will also be a leakage current between the live wire and the neutral wire, which may easily cause a short circuit in the line, and then cause a fire. When the above two situations occur, the power supply needs to be cut off to ensure safety. [0003] In the low-voltage power grid, installing equipment with leakage protection function is an effective protective measure to prevent personal electric shock casualties, electrical fires and electrical equipment damage. This kind of equipment...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/32
Inventor 熊焘包章尧黄琦
Owner SIEMENS AG