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Devices for reducing residual current

A technology of residual current and ammeter, which is applied in the direction of emergency protection circuit devices, circuit devices, emergency protection circuit devices, etc. for limiting overcurrent/overvoltage, and can solve problems such as cutting off electrical equipment

Active Publication Date: 2019-12-03
EATON IND (AUSTRIA) GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] The flaw here is that, apart from the actual source of the fault, all other parts of the electrical equipment are similarly switched off

Method used

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  • Devices for reducing residual current

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Embodiment Construction

[0016] This figure shows a device 1 for reducing the residual current in a circuit 2 (especially in a low-voltage electric line), wherein the device 1 has a residual current sensor 3 and an ammeter 4, and the output terminal of the residual current sensor 3 Connected to the input end of the ammeter 4, wherein the device 1 has a step-down unit 5 connected to the output end of the ammeter 4, and wherein the step-down unit 5 is configured to measure the residual current The size is used to reduce the voltage existing downstream of the device 1 to limit the measured residual current to a specified value, especially 30 mA.

[0017] Therefore, when the residual current occurs and its cause continues to exist, if the fault that causes the ground connection is not extremely low resistance, the limited operation of the electrical equipment 13 can be maintained. In this way, for example, computer systems or simple lighting devices can still operate. Since the power supply voltage existing...

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Abstract

A device (1) for reducing residual currents in electrical circuits (2), in particular in low-voltage electrical lines, is proposed, wherein the device (1) has a residual current sensor (3) and a current measuring unit (4), wherein The output end of the residual current sensor (3) is connected to the input end of the current measurement unit (4), and the device (1) is provided with a step-down unit (5), and the step-down unit (5) is connected to the The output terminal of the current measurement unit (4) is connected, and the step-down unit (5) is designed to reduce the voltage subsequently applied to the device (1) according to the peak value of the measured residual current, so as to convert the measured The residual current is limited to a predetermined value, especially 30mA.

Description

Technical field [0001] The present invention relates to a device for reducing residual current in a circuit. Background technique [0002] Monitoring circuits for the occurrence of so-called residual current or ground residual current is a well-known procedure and is regulated by law in most countries. If the residual current is confirmed to have exceeded the given value, the above-mentioned circuit is cut off by the residual current circuit breaker. The specific value that causes the circuit to be cut off is, for example, only 30 mA, which is the limit of human ventricular fibrillation. [0003] The disadvantage here is that, except for the actual source of the fault, all other parts of the electrical equipment are also cut off. In the current common situation, it is impossible to continue to operate an electrical system with such a low resistance ground connection. Once you try to start the affected circuit or the affected electrical system again, the above residual current ci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H9/08
CPCH02H9/08G05F1/573H02H3/08H01H83/20H01H83/144H02H9/025H02H9/02
Inventor M·科赫
Owner EATON IND (AUSTRIA) GMBH
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