Residual current device

A residual current and zero-sequence current technology, applied in the electrical field, can solve problems such as complex circuit design and large power consumption, and achieve good frequency response characteristics

Active Publication Date: 2015-05-27
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these attempts generally have various problems such as complex circuit design and high power consumption.

Method used

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Embodiment Construction

[0021] In order to make the technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to illustrate the present invention, and are not intended to limit the protection scope of the present invention.

[0022] figure 1 It is a structural diagram of a residual current device according to the present invention. Such as figure 1 As shown, the residual current device includes a first zero-sequence current transformer 101 and a first processing circuit 102 , wherein the first processing circuit 102 is connected to the first zero-sequence current transformer 101 . One or more current-carrying conductors (not shown in the figure) for carrying current may pass through the iron core of the first zero-sequence current transformer 101 , such as the phase line and the ne...

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Abstract

Embodiments of the present invention disclose a Residual Current Device (RCD). The RCD includes: a first zero-sequence current transformer, used for passively detecting a residual current signal of a current-carrying conductor; a first processing circuit connected to the first zero-sequence current transformer, used for acquiring the residual current signal from the first zero-sequence current transformer, and actively processing the residual current signal, where the first processing circuit is connected to a power source; a second zero-sequence current transformer, used for actively detecting the residual current signal appearing on the current-carrying conductor; and a second processing circuit connected to the second zero-sequence current transformer, used for acquiring the residual current signal from the second zero-sequence current transformer, and actively processing the residual current signal, where the second processing circuit is connected to the power source. The RCD can make a very good response within a wide frequency range, and achieve better frequency response characteristics.

Description

technical field [0001] The invention relates to the field of electrical technology, in particular to a residual current device. Background technique [0002] Residual Current, also known as excess current, residual current or leakage current, refers to the current in which the vector sum of the currents of each phase (including the neutral line) in low-voltage distribution lines is not zero. Residual current is extremely harmful. In electrical fire accidents, accidents caused by excess current account for about 1 / 2 of electrical fire accidents, which shows the severity and universality of excess current. [0003] The residual current device (Residual Current Device, RCD) is a protector that turns on, loads and disconnects the current under normal working conditions, and when the residual current of the circuit exceeds the normal range, it will cause an action to disconnect the main circuit. The residual current device is essentially a leakage current protection device, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/32G01R19/165
CPCG01R31/52H02H3/332H02H3/334H02H3/347
Inventor 吴笛
Owner SIEMENS AG
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