Residual current protecting device

A technology of residual current and protection device, applied in the direction of emergency protection circuit device, circuit device, automatic disconnection emergency protection device, etc., can solve problems such as hazards

Active Publication Date: 2015-07-01
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in some application scenarios, such as wet environments or medical scenarios, even a residual current of less than 30mA ma

Method used

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  • Residual current protecting device
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Embodiment Construction

[0017] 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.

[0018] figure 2 It shows a B-type residual current protection device provided according to an embodiment of the present invention, and the B-type residual current protection device includes a first current transformer W1, a second current transformer W2, a first switch K1, and a second switch K2 , the first residual current detection module without auxiliary power supply and the second residual current detection module with auxiliary power supply. The first residual current detection module has a power supply interface, which can introduce the measured A, B, and C three-phase line voltages to realize auxiliary power supply.

[0019] The first residual current detection module is used to detect the AC and / or pulsating DC residua...

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Abstract

The invention provides a residual current protecting device. The residual current protecting device comprises a first current transformer, a second current transformer, a switching unit, a first residual current detecting module and a second residual current detecting module, wherein the second residual current detecting module comprises a first detecting unit and a second detecting unit; the switching unit is used for switching the residual current protecting device between a first state and a second state, so that, in the first state, the coil of the first current transformer and the coil of the second current transformer can be connected in series and both ends of the formed series-connected coil set can be connected with the two input electrodes of the first residual current detecting module, and in the second state, both ends of the coil of the first current transformer can be connected with the first detecting unit and both ends of the coil of the second current transformer can be connected with the second detecting unit. The residual current protecting device can enhance the sensitivity under the premise of no increase in size.

Description

technical field [0001] The invention relates to a residual current protection device. Background technique [0002] Residual current protection devices are widely used in power distribution systems to protect personal safety. At present, residual current protection products mainly include AC type, A type and B type. Among them, the AC type is used for the detection of AC residual current, and is mainly used in general AC circuits. Type A is used for the detection of AC and DC pulsating residual current, and is usually used in circuits with more electronic equipment, such as: microcomputers, cash registers, electronic scales and other electrical equipment. Type B is used for the detection of AC and DC pulsation and DC smooth residual current. It is usually used in smooth DC or smooth DC circuits with slight aftermath when a fault occurs, such as: frequency converter, CT-equipment, X-ray equipment , Uninterruptible power supply equipment. Among them, the B-type residual cu...

Claims

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Application Information

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IPC IPC(8): H02H3/32G01R31/50
CPCG01R19/00G01R15/18H02H3/33H02H3/332H02H3/347G01R31/52G01R31/50
Inventor 杜峰陈维刚卓越
Owner SIEMENS AG
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