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Arc fault detection device and detection method thereof

An arc fault and detection device technology, applied in the direction of measurement device, measurement of electricity, measurement of electric variables, etc., can solve problems such as inability to fully identify arcs, arc detection devices cannot distinguish load characteristics, etc. The effect of stable operation and communication

Inactive Publication Date: 2013-09-04
ZHEJIANG EIT ELECTRON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the arc detection device in the prior art cannot distinguish the load characteristics in the circuit and cannot fully identify the arc in the circuit, so as to provide a device that can automatically adjust according to the characteristics of the arc and fully identify the arc. Arc fault detection device and detection method thereof

Method used

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  • Arc fault detection device and detection method thereof
  • Arc fault detection device and detection method thereof
  • Arc fault detection device and detection method thereof

Examples

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Embodiment 1

[0041] The invention provides an arc fault detection device, such as figure 1 shown, including:

[0042] (1) Power module: providing power for the arc fault detection device, the power module includes an AC / DC conversion circuit and a DC / DC conversion circuit, and the AC / DC conversion circuit is connected to the DC / DC conversion circuit.

[0043] (2) Signal acquisition and processing unit: including a current transformer set in the circuit to be tested, a sampling circuit for sampling the residual current and overcurrent sensed by the current transformer, and an amplification circuit for amplifying the sampling signal circuit. The sampling circuit includes a sampling resistor, a capacitor and a clamping diode arranged in parallel. The amplifying circuit includes a first-stage amplifying circuit and a second-stage amplifying and filtering circuit, the first-stage amplifying circuit includes a first operational amplifier, a first resistor connected between the negative pole of...

Embodiment 2

[0056] The arc fault detection device described in this embodiment, the circuit diagram is as follows figure 2 , image 3 , Figure 4 , Figure 5 As shown, the power module is an AC / DC conversion circuit, using ACDC1 power converter to convert AC220V into DC5V power supply for detection device signal acquisition and processing power, man-machine dialogue unit, using UV3 integrated LDO power supply block to convert DC5V power into DC3 .3V power supply is used for central processing operation unit and communication unit. The signal acquisition and processing unit module uses a high-permeability nanocrystalline current transformer to sample the residual current and overcurrent of the load line, and the transformer processes the induced current signal through the circuit of sampling resistor RS1, capacitor CS1, and clamping diode DS1. After sampling and processing, the signal is sent to the operational amplifier circuit composed of operational amplifier US1, resistor RS4, and ...

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Abstract

The invention relates to an arc fault detection device which comprises a power module, a signal acquisition processing unit, a central processing arithmetic unit and a control output unit capable of controlling power connection and disconnection of a load. The central processing arithmetic unit identifies arcs through a load arc feature library, a load arc type analysis module and a load arc judgment module, and outputs a control signal to the control output unit to control the connection and disconnection of a load circuit. By means of the arc fault detection device, the problems that an arc detection device in the prior art cannot distinguish load characteristics in a loop and cannot sufficiently identify the arcs in the loop are effectively avoided. The arc fault detection device and a detection method of the arc fault detection device can be adjusted automatically according to the characteristics of the arcs and can sufficiently identify the arcs.

Description

technical field [0001] The invention relates to an arc fault detection device, which belongs to the technical field of circuit protection. Background technique [0002] An arc is an instantaneous spark produced by an electric current passing through an insulating medium. When breaking or closing a circuit with a voltage exceeding 10V and a current exceeding 100MA in the atmosphere, an arc will be generated in the contact gap of the electrical appliance. When an arc occurs, a huge amount of energy is released in a very short time. Metal conductive elements will vaporize causing high temperature steam and rapid expansion of the metal. Rapid thermal expansion of air and metal vapors can cause loud, loud explosions and tremendous pressure. Moreover, the temperature suddenly rises after the arc is generated, which will cause thermal separation of the gas in the arc gap, which in turn intensifies the ionization of air molecules, making the arc continue to burn, thus increasing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02G08B17/06
Inventor 陶章亮谢海彬吴金海聂河东林素欧胡中祥周铭
Owner ZHEJIANG EIT ELECTRON
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