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Electric leakage breaker

A leakage circuit breaker and circuit technology, applied in circuit devices, emergency protection circuit devices, electrical components, etc., can solve problems such as loss of leakage function

Active Publication Date: 2007-09-12
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when the voltage is obtained from the R-T phase as mentioned above, there will be no problem when the S phase loses the phase, but when the R phase or the T phase loses the phase, the leakage function will be lost immediately.

Method used

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  • Electric leakage breaker
  • Electric leakage breaker
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Embodiment approach 1

[0021] FIG. 1 is an internal connection diagram of a three-pole earth leakage circuit breaker in Embodiment 1 of the present invention, and FIG. 2 is a diagram showing an output voltage waveform of a rectifier circuit in FIG. 1 . In addition, FIG. 3 is a detailed diagram of the power supply circuit in FIG. 1 .

[0022] In FIG. 1, a three-pole earth leakage circuit breaker (hereinafter referred to as an earth leakage circuit breaker) 71 is provided with a power supply terminal 61 on the power supply side of the installed circuit, and a load side terminal 62 on the load side. The power lines 63 connected to the terminals are provided in three sets via circuit contacts 64 for switching the current flowing through the power lines 63 . In addition, for the sake of convenience, the electric power line 63 is denoted by R, S, and T symbols from the upper side to the lower side in the figure. The power line 63 is inserted into the zero-sequence converter 65 arranged on the load side (...

Embodiment approach 2

[0034] FIG. 4 is a diagram corresponding to FIG. 3 including a thyristor in Embodiment 2 of the present invention. The difference from FIG. 3 is that the thyristor and the field effect transistor are divided into two stages. Not limited to thyristors and field effect transistors, these elements have an external shape corresponding to a circuit built in an earth leakage circuit breaker, and the usable voltage can naturally be determined from the external shape. That is, when the circuit voltage is high, it is preferable to use the power supply circuit described in this Embodiment 2 (Embodiment 1 is for a circuit voltage of AC100-200V series, and Embodiment 2 is for a circuit voltage of AC100-400V series). In addition, since there is no great difference in the process of generating the DC voltage to the leakage detection circuit 1, here, for the purpose of improving the withstand voltage performance, the average application method of the main circuit voltage corresponding to the...

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PUM

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Abstract

The invention provides a small leakage circuit breaker which obtains working electricity from each phase of three-phase circuit, and which can be inversed connected without adding switch member for switching the working electricity supply. The leakage circuit breaker includes: zero sequence converter in which three electricity wires are inserted and which detects leakage current of the three-phase circuit; leakage current detecting circuit for level determination of signal detected by the zero sequence converter; electromagnet device which follows with output of the leakage current detecting circuit and actuates open-close mechanism; and circuit contact point which is cut off by the action of the open-close mechanism, and the leakage current detecting circuit and the electromagnet device is powered from the three electricity wires via rectifier circuit, and at the same time, the rectifier circuit is a half-wave rectifier, and the electromagnet device is connected to back section of the half-wave rectifier.

Description

technical field [0001] The present invention relates to an earth leakage circuit breaker that cuts off a circuit when the leakage current of the circuit is equal to or greater than a predetermined value. Specifically, it relates to a technology for improving power supply voltage generation as a driving source of the function. Background technique [0002] At present, almost all of the earth leakage circuit breakers on the market adopt a system in which the level of the signal detected by the zero-sequence current transformer is determined in the leakage detection circuit built in the earth leakage circuit breaker, for example, which is composed of an integrated circuit. Judgment, if it exceeds the specified value, output a driving signal to the electromagnet device also built in the earth leakage circuit breaker to break the circuit. However, these earth leakage detection circuits and electromagnet devices require operating power, which is obtained from inside the earth leak...

Claims

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Application Information

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IPC IPC(8): H01H83/02H01H83/14H02H3/347
CPCH02H1/066H02H3/347
Inventor 三好伸郎
Owner MITSUBISHI ELECTRIC CORP