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Leakage early-warning device and socket

An early warning device and alarm technology, which is applied in the direction of measuring devices, measuring electricity, alarms, etc., can solve the problems of inability to judge the leakage, disconnection, and potential safety hazards of electrical equipment

Inactive Publication Date: 2011-10-05
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the grounding connection of some electrical equipment may be misconnected, loosened or disconnected during assembly or use, and users cannot judge whether the electrical equipment is leaking, posing potential safety hazards

Method used

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  • Leakage early-warning device and socket
  • Leakage early-warning device and socket
  • Leakage early-warning device and socket

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0034] see figure 1 , the leakage warning device 100 according to the preferred embodiment of the present invention is used to detect whether the metal casing 202 of an electric device 200 is electrically connected to the grounding terminal 302 of the local power supply 300, and the connection between the metal casing 202 and the grounding terminal 302 is disconnected. Or send an alarm when it is bad, so as to prevent electricity safety accidents from happening.

[0035] The electrical equipment 200 can be various household appliances or factory machines, equipment, instruments, meters, etc., and its internal power consumption is equivalent and represented as a power resistor 204 .

[0036] Generally, the local power supply 300 also includes a live terminal 304 and a neutral terminal 306 . The ground terminal 302 and the neutral terminal 306 are connected to the ground, and the AC voltage of the live terminal 304 relative to the ground is about 220V. Generally, due to the ex...

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PUM

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Abstract

The invention provides a leakage early-warning device, which comprises a constant current source, a measuring unit, an alarming unit, a controller and a power source unit. The constant current source is connected with a metal shell of electrical equipment to be detected and is used for flowing constant current to the metal shell. The measuring unit is used for measuring voltage at a grounding terminal of a local power source and a voltage difference between the metal shell and the grounding terminal. The controller is used for driving the alarming unit to generate early warning when the voltage at the grounding terminal is zero or the voltage difference between the metal shell and the grounding terminal is greater than a predetermined value, so as to prevent an electric safety accident. The power source unit is used for providing working voltage for the constant current source, the measuring unit, the alarming unit and the controller. The invention also provides a socket with the leakage early-warning device.

Description

technical field [0001] The invention relates to electricity safety technology, in particular to an electric leakage early warning device and a plug strip provided with the electric leakage early warning device. Background technique [0002] Generally, the metal casing of the electrical equipment will be connected to the ground to avoid the short circuit between the internal circuit of the electrical equipment and the metal casing, and the leakage phenomenon that the voltage of the metal casing relative to the earth is higher than the safe voltage. However, the ground connection of some electrical equipment may be wrongly connected, loosened or disconnected during assembly or use, and users cannot judge whether the electrical equipment is leaking, posing potential safety hazards. Contents of the invention [0003] In view of this, it is necessary to provide an electric leakage early warning device. [0004] A leakage early warning device includes a constant current source,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02G08B21/00
CPCG01R31/025G01R31/52
Inventor 童松林
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD
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