Electric arc fault detector

A technology for current detectors and arcs, which is applied to fault locations, electrical components, circuit devices, etc., and can solve problems such as inability to distinguish signals, signal misrecognition, damage, etc.

Inactive Publication Date: 2005-11-16
瑞昌电气通信株式会社
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] The second type, as shown in Figure 2, will cause a parallel arc between the wires (line arc)
Carbonization caused by excessive direct sunlight or lightning strikes affecting the wiring system, or cutting mechanical operations on the cable extension joint when the cable is crushed under furniture such as chairs, can cause aging or damage to the inner insulation
[0005] The third type, as shown in Figure 3, will cause a ground arc between the wire and the

Method used

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Embodiment Construction

[0049] Now, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0050] Figure 5 A block diagram of an arc fault detection device according to a preferred embodiment of the present invention is shown.

[0051] Such as Figure 5 As shown, the arc fault detection device may include: a current detector 500, a signal converter 502, a first level limiting amplifier 504, a high pass filter 526 and a second level limiting amplifier 506, a signal level detector 508, a pulse generator The circuit breaker 510 and the first arc determination unit 512, the circuit breaker 514 and the second arc determination unit 524. The current detector 500 detects the amount of change in the current flowing through the phase conductor 518 and outputs a current detection signal. Although Figure 5 Shown is the case where the current detector is connected to the phase conductor 518 connected between the source and the load, however...

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Abstract

A device for detecting arc fault consists of current detector for detecting current variation and for generating its proportional signal, signal converter for limiting signal level, the first level limit amplifier, signal level detector for generating detection signal, pulse generator for forming normalization pulse, the first arc determining unit for counting pulse signal to judge whether arc is occurred or not and for generating arc detection signal, as well as breaker for cutting off wire when arc detection signal is generated.

Description

technical field [0001] The present invention relates to apparatus for detecting arc faults in power distribution systems, and in particular to an arc fault detection apparatus that separates harmful arcs that cause fires from voltages generated when starting electrical equipment and operating dimmers Effectively distinguish where these voltages are often mistaken for arcs. Background technique [0002] The causes of arc faults are various, for example, aging, breakage of insulation and conductors, mechanical and electrical stress caused by excessive use or excessive voltage, connection failures, and excessive mechanical failure of conductors. Generally, arc faults occurring in residential buildings or commercial buildings can be classified into three cases. [0003] First, a series arc (contact arc) occurs between wires connected in series with the load. Figure 1 shows the situation where series arcing occurs. Referring to FIG. 1 , the conductors 14 and 16 constituting th...

Claims

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Application Information

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IPC IPC(8): G01R31/08
Inventor 金千然金东燮高正明文济天
Owner 瑞昌电气通信株式会社
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