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Differential current transformer and residual current operated protective device

A technology of differential current and transformer, which is applied in the field of residual current action protectors, can solve the problems of large RCD size and restrict the development of small RCDs, and achieve the effect of reducing volume

Inactive Publication Date: 2014-09-03
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the minimum height of the DCT iron core in the AC type RCD can only be 2mm
This makes the volume of RCD correspondingly large, however, small and compact RCD is becoming the demand of today's market, but the current larger DCT restricts the development of small RCD

Method used

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  • Differential current transformer and residual current operated protective device
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  • Differential current transformer and residual current operated protective device

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Embodiment Construction

[0035] 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 with reference to the accompanying drawings and examples.

[0036]In the embodiment of the present invention, the volume of the residual current operated protector RCD can be reduced by providing a small differential current transformer DCT, for example, the designed size (such as height) can be smaller than the iron core size (such as height ) DCT core. For the convenience of description, the height of the iron core in the prior art is referred to as the first height in this application, and the iron core height of the small-sized DCT in this application may be smaller than the first height. However, in actual implementation, if the height of the DCT iron core is only directly reduced in the RCD in the prior art, the cross-sectional area S of the DCT iron core will be correspondingly reduced, and the value of B...

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PUM

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Abstract

The present invention discloses a differential current transformer (DCT) and a residual current operated protective device (RCD). In this case, the DCT comprises an iron core and a secondary coil wound on said iron core, and said DCT is connected with a sampling circuit, which sampling circuit is a dual-regulated sampling circuit by both load resistance (Z 1 ) and amplifier feedback loop resistance (Z 2 ). In the technical solution disclosed in the present invention, it is made possible for the size of the DCT to be smaller than that of the DCT in the prior art by providing a dual-regulation circuit, thereby reducing the volume of RCD, and ensuring the linearity and sensitivity performance of the DCT.

Description

technical field [0001] The present invention relates to the technical field of leakage protection, in particular to a residual current device (Residual Current Device; RCD) and a differential current transformer (Differential Current Transformer; DCT) in the residual current device RCD. Background technique [0002] The residual current operated protector RCD is a current operated leakage protection device, and the differential current transformer DCT is an important component of the RCD, which is used to detect whether there is residual current (ie leakage current) in the power line. The structure of the DCT is similar to that of a transformer, including an iron core and two coils wound on the iron core that are insulated from each other. When there is residual current on the primary side, the secondary coil will induce current. In addition, the DCT may also include shielded housings and brackets. In practical applications, the primary coil is connected to the detected pow...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/32
CPCH02H3/33H02H1/0092
Inventor 杨歆漪闵应宗徐泽亮卓越
Owner SIEMENS AG