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System and method for detecting coupling current

A technology of coupling current and detection system, applied in the direction of measuring current/voltage, measuring device, measuring electrical variables, etc., can solve problems such as electric shock and various accidents

Active Publication Date: 2015-04-08
SHANGHAI SIEMENS CIRCUIT PROTECTION SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This kind of misjudgment can lead to electric shock and various accidents.

Method used

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  • System and method for detecting coupling current
  • System and method for detecting coupling current
  • System and method for detecting coupling current

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Embodiment Construction

[0031] figure 2 A schematic block diagram of the coupled current measurement system is shown. In the figure, the current measuring unit is used to measure whether there is a coupling current between two different power supply lines. and figure 1 As shown similarly, the power supply line of the electric device 21 has been disconnected, and the power supply line of the electric device 22 is working normally. As mentioned above, if the power supply lines of the devices 22 and 21 are arranged adjacent to each other, it is possible to generate a coupling current in the line of 21 through the coupling capacitance. A detector 23 is connected between the live line L of the load 21 and the common neutral line N of the loads 21 and 22 to measure whether there is coupling current on the line L of the load 21 and the total value of the coupling current on the line. The detection unit 23 can also be connected between the live wire of the load 21 and the neutral wire of the load 22 , th...

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Abstract

The invention provides a system and a method for detecting coupling current. The system comprises a sampling unit for detecting whether the coupling current exists between a disconnected power supply circuit (21) and a connected power supply circuit (22) or not and generating a detecting signal to indicate the coupling current, a processing unit for receiving and processing the detecting signal and transmitting the processed detecting signal to an output unit, and the output unit for receiving the processed detecting signal and outputting the processed detecting signal to a user in a visual or an audible manner.

Description

technical field [0001] The present invention relates to a system and method for detecting coupling current. Specifically, the present invention proposes a coupling current monitoring system for AC power supply lines, which is used to detect coupling currents formed by coupling capacitance on different power supply lines. Background technique [0002] In household or industrial field applications, when some electrical appliances are found to be faulty, users usually disconnect the faulty circuit first, and then perform maintenance on the electrical equipment. Generally speaking, users will think that as long as the power switch of the faulty line is turned off, the line after disconnection should be dead and safe. In fact, this judgment is not correct in all cases. For example, even if the power switch is turned off, if the disconnected line is connected to or touches other power sources or live objects due to abnormal conditions, the disconnected line may still be live. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/28
Inventor 熊焘包章尧熊厚钰
Owner SHANGHAI SIEMENS CIRCUIT PROTECTION SYST