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Leakage protection device

A leakage protection device and resistance technology, applied in circuit devices, emergency protection circuit devices, automatic disconnection emergency protection devices, etc., can solve problems such as failure of protection function and danger of omnipotent leakage protection plugs

Active Publication Date: 2013-04-03
刘睿刚
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although the existing all-round leakage protection device can realize the above-mentioned leakage protection function, the correct power supply must be provided in order to make the leakage protection circuit work normally.
Once there is a fault at the power supply end (such as: the phase wire or the neutral wire is accidentally disconnected, or the phase wire and the ground wire of the power end are reversed), resulting in no power supply circuit, the protection function of the universal leakage protection plug will fail
At this time, if there is a phase line leakage or a lack of grounding protection system (such as: a residual current reaching a preset threshold or an accidental grounding current), it will be very dangerous

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] see figure 1 As shown in the figure, a leakage protection device is mainly composed of the following components: shell, phase wire 6 at the power supply end, neutral wire 5, ground wire 7, phase wire 9 at the load end, neutral wire 8, ground wire 10, test loop, zero sequence current Transformer 18, ground wire detection circuit 32, tripping and locking device, the tripping and locking device including phase line contacts 2-2 and 1-2, neutral line contacts 2-1 and 1-1, ground Line contacts 3 and 4, springs, reset push rods, electromagnetic coils 11, control circuit 33, the control circuit 33 consists of current limiting resistor 12, rectifier circuit 13, thyristor 14, first diode 16, amplifier circuit 17 and down The ground wire detection circuit 32 is composed of a first resistor 19, a Zener diode 20, a capacitor 21, a voltage comparison circuit 31, a photocoupler 27 and a second resistor 28. The voltage comparison circuit 31 is composed of the second diode 22, The thi...

Embodiment 2

[0042] see figure 2 As shown in the figure, a leakage protection device is mainly composed of the following components: shell, phase wire 6 at the power supply end, neutral wire 5, ground wire 7, phase wire 9 at the load end, neutral wire 8, ground wire 10, test loop, zero sequence current Transformer 18, ground wire detection circuit 32, tripping and locking device, the tripping and locking device including phase line contacts 2-2 and 1-2, neutral line contacts 2-1 and 1-1, ground Line contacts 3 and 4, springs, reset push rods, electromagnetic coils 11, control circuit 33, the control circuit 33 consists of current limiting resistor 12, rectifier circuit 13, thyristor 14, first diode 16, amplifier circuit 17 and down The ground wire detection circuit 32 is composed of a first resistor 19, a Zener diode 20, a capacitor 21, a voltage comparison circuit 31, a photocoupler 27 and a second resistor 28. The voltage comparison circuit 31 is composed of the second diode 22, A thir...

Embodiment 3

[0050] see image 3 As shown in the figure, a leakage protection device is mainly composed of the following components: shell, phase wire 6 at the power supply end, neutral wire 5, ground wire 7, phase wire 9 at the load end, neutral wire 8, ground wire 10, test loop, zero sequence current Transformer 18, ground wire detection circuit 32, tripping and locking device, the tripping and locking device including phase line contacts 2-2 and 1-2, neutral line contacts 2-1 and 1-1, ground Line contacts 4 and 3, spring, reset push rod, electromagnetic coil 11, control circuit 33, the control circuit 33 is composed of current limiting resistor 12, rectifier diode 30, thyristor 14, first diode 16, amplifying circuit 17 and reducing The ground wire detection circuit 32 is composed of a first resistor 19, a Zener diode 20 and a voltage comparison circuit 31. The voltage comparison circuit 31 is composed of a second diode 22, a third resistor 23, an operational amplifier circuit 24, and a ...

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Abstract

The invention discloses a leakage protection device which can prevent the electric shock accidents caused by the fault of electrical appliances at the load end, but also can prevent the electric shock accidents caused by the fault of power sources with electric shock hazards. The leakage protection device comprises a zero-sequence current transformer, a test loop and an unlocking and locking device; an electromagnetic coil and a control circuit of the electromagnetic coil are arranged in the unlocking and locking device; a control circuit and an electromagnetic coil are connected between the phase line and the null line of a power source terminal; and a ground wire detecting circuit is connected among the null line, a ground wire and the control circuit.

Description

technical field [0001] The invention relates to the technical field of electricity safety protection, in particular to a leakage protection device for leakage protection. Background technique [0002] The existing all-round leakage protection device can detect whether there is residual current between the phase line and the neutral line at the load end. Immediately trip, cut off the phase, neutral and ground wires; when the ground wire has an unexpected current and reaches a preset threshold (for example: 10mA), it will also trip immediately, cut off the phase, neutral and ground wires. Therefore, humans and animals can be prevented from being hurt by excessive residual current and accidental ground wire current. [0003] Although the existing all-around leakage protection device can realize the above leakage protection function, in order to make the leakage protection circuit work normally, a correct power supply must be provided. Once the power supply side fails (for exa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/00H02H3/32H02H3/14H02H11/00
Inventor 刘睿刚
Owner 刘睿刚
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