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Method and device for detecting residual current

A residual current and current technology, applied in the direction of measuring device, circuit device, emergency protection circuit device, etc., can solve the problem that the residual current frequency detection range cannot reach a higher value, and save hardware cost, space, and scalability. Strong, low power consumption and low cost effect

Active Publication Date: 2015-03-18
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This causes the frequency detection range of the residual current to be limited by the power and the circuit and cannot reach a higher value

Method used

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  • Method and device for detecting residual current
  • Method and device for detecting residual current
  • Method and device for detecting residual current

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Embodiment Construction

[0029] figure 2 A residual current detection device 200 according to an embodiment of the present invention is schematically shown. and figure 1 different, figure 2 In the shown device 200 , the hardware filtering circuit 140 is no longer included, and the spectrum filtering is implemented by the processing unit 250 instead. Specifically, as figure 2 As shown, the A / D sampling circuit (analog / digital sampling circuit) 260 samples the voltage on the sampling resistor 130 and converts the sampled voltage signal into a digital signal to form time-domain data and send it to the processing unit 250 . The time domain data is processed within the processing unit 250 . Optionally, if the processing unit 250 itself has an A / D port, the processing unit 250 may also be directly coupled to the upper end of the sampling resistor 130 . According to actual needs, the sampling resistor 130 can also be replaced by other more complex sampling circuits. Alternatively, the A / D sampling c...

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Abstract

The present invention sets forth a method for residual current detection, comprising: acquiring time domain data associated with a current flowing through a current transformer, wherein the current transformer is used for sensing residual current on a power supply line, and the time domain data includes an excitation signal component for exciting the current transformer; converting the time domain data from the time domain to the frequency domain, to obtain frequency domain data; filtering the frequency domain data in the frequency domain, to filter out frequency domain data associated with the excitation signal; analysing the filtered frequency domain data, to determine whether a residual current is present.

Description

technical field [0001] The invention relates to a residual current detection method and device, and also relates to a residual current protection device with the residual current detection device. Background technique [0002] figure 1 A typical residual current detection device is shown as an example. Such as figure 1 As shown, the residual current detection device 100 includes: an inductor 110 , an excitation signal generation circuit 120 , a sampling resistor 130 , a filter circuit 140 , and a processing unit 150 . [0003] exist figure 1 In the figure, the inductance 110 represents a winding of a current transformer, one end of which is connected to the excitation signal generating circuit 120 , and the other end is connected to the sampling resistor 130 . The current transformer includes an iron core and a winding, and its function is to sense whether there is residual current or leakage current on the power supply line (not shown in the figure). [0004] exist fi...

Claims

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Application Information

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IPC IPC(8): G01R19/25
CPCH02H3/33G01R31/025H02H3/167G01R19/2506G01R19/2513G01R31/52
Inventor 黄先吴笛
Owner SIEMENS AG