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Leakage circuit breakers

A technology of leakage circuit breaker and circuit, which is applied in the direction of protection reacting to overcurrent and protection reacting to overvoltage, and can solve problems such as failure of power supply circuit of leakage circuit breaker

Active Publication Date: 2018-10-16
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if Image 6 If a load circuit is connected to an earth leakage circuit breaker as shown, excessive current is accidentally applied continuously between phases via equipment connected between the earth (for example, surge absorbing capacitors, noise filters, etc.) voltage, which, as a result, sometimes causes the power circuit of the earth leakage circuit breaker to malfunction

Method used

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  • Leakage circuit breakers
  • Leakage circuit breakers
  • Leakage circuit breakers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0022] figure 1 It is a circuit diagram showing the structure of the earth leakage circuit breaker using the power supply circuit in Embodiment 1 of the present invention, figure 2 yes means figure 1 The circuit diagram for details of the power supply circuit, image 3 yes means figure 2 Details of the trigger circuit in the circuit diagram.

[0023] exist figure 1 Among them, the leakage circuit breaker 100 has: an opening and closing contact 2, which makes the AC circuit 1 open and close; an overcurrent detector 3, which detects the overcurrent of the AC circuit 1; a leakage current detector 4, which is inserted into the AC circuit In 1, the leakage current is detected; the detection circuit 5 detects the overcurrent or leakage based on the detection signals of the overcurrent detector 3 and the leakage current detector 4; the power supply circuit 6 is connected with the AC circuit 1 for use The switching transformer used to drive the detection circuit 5; the overc...

Embodiment approach 2

[0070] Figure 4 It is a circuit diagram showing the power supply circuit of the earth leakage circuit breaker 101 in Embodiment 2, Figure 5 yes means Figure 4 A circuit diagram showing an example of the details of the integrating circuit.

[0071] In Embodiment 1, an example of the isolated power supply circuit 6 using the switching transformer 23 a was shown, but in this embodiment, a non-isolated power supply circuit 61 is used instead of the isolated power supply circuit 6 . The other configurations are the same as those in Embodiment 1, so descriptions thereof are omitted.

[0072] The power supply circuit 61 converts the AC voltage input from the AC circuit 1 into a predetermined DC voltage to supply an excitation current to the overcurrent tripping element 7 and the leakage tripping element 8, and converts it to a voltage lower than the output voltage of the power supply circuit 61 by the constant voltage circuit 33. The specified voltage supplies power to the dete...

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PUM

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Abstract

The present invention provides an earth leakage breaker capable of being cut off to prevent failure of an embedded power circuit even when overvoltage is continuously applied to an alternating current (AC) circuit in a withstand voltage test or the like. According to the present invention, the earth leakage breaker comprises: an opening / closing contact point (2) to open / close the AC circuit (1); an overcurrent detector (3) to detect overcurrent of the AC circuit (1); a leakage current detector (4) to detect leakage current of the AC circuit (1); an overcurrent trip device (7) to open the opening / closing contact point (2) based on a signal detected by the overcurrent detector (3); a leakage trip device (8) to open the opening / closing contact point (2) based on a signal detected by the leakage current detector (4); and an overvoltage detection circuit (34) detecting overvoltage from the AC circuit (1) to operate the overcurrent trip device (7).

Description

technical field [0001] The present invention relates to an earth leakage circuit breaker that disconnects a circuit when the leakage current of the circuit becomes greater than or equal to a predetermined value, and particularly relates to an earth leakage circuit breaker whose overcurrent tripping method is electronic. Background technique [0002] The power supply circuit built into the leakage circuit breaker converts the AC voltage (for example, AC100V) supplied from the AC circuit into a DC voltage by a rectification circuit, and then converts the rectified DC voltage into a DC voltage of a lower voltage by a step-down circuit (for example, DC24V) is supplied as a driving power supply for leakage detection circuits and tripping devices. [0003] In such a power supply circuit, when a surge voltage is induced in an AC circuit due to lightning strike, arc grounding, etc., it is necessary to protect the leakage detection circuit and the tripping device from the surge volta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/08H02H3/20
CPCH02H3/08H02H3/20
Inventor 上青木大塚本龙幸
Owner MITSUBISHI ELECTRIC CORP