Fault arc detection method based on high frequency characteristic and apparatus thereof

A technology of fault arc and detection device, which is applied in the direction of testing dielectric strength, etc., can solve problems such as increasing circuit complexity, achieve the effects of reducing sampling rate and algorithm complexity, high sensitivity, and improving detection probability

Inactive Publication Date: 2016-01-06
北京芯同汇科技有限公司
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0007] 3. Before high-speed ADC sampling, it is necessary to design a relatively steep anti-aliasing filter, which increases the circuit complexity to a certain extent.

Method used

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  • Fault arc detection method based on high frequency characteristic and apparatus thereof
  • Fault arc detection method based on high frequency characteristic and apparatus thereof
  • Fault arc detection method based on high frequency characteristic and apparatus thereof

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Embodiment

[0079] In this embodiment, the fault arc detection device is installed in a 220V / 50Hz AC power grid. It only needs to configure filter software and hardware parameters, and it can be installed in a 110V / 60Hz AC power grid, and can also detect DC fault arcs.

[0080] The hardware system flow chart of this embodiment is as follows Figure 6 As shown, a capacitor is incorporated at the input end to reduce the interference of its upstream branch. In this embodiment, the capacitor incorporated into the input terminal is selected as a safety capacitor, the broadband current transformer is selected as a Hall current transformer, and the filtering part in the current filtering and shaping module is composed of 2 high-pass filters and 2 low-pass filters, such as Figure 4 , its parameters are as follows: N1=1, N2=1, M1=2, M2=3; G11=G12=20G11=G12=20, G21=G22=5; R3=100Ω, R4=5kΩ in the hysteresis comparison circuit .

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Abstract

The invention provides a fault arc detection method based on a high frequency characteristic and an apparatus thereof. The apparatus comprises a voltage zero-crossing detection unit, a current waveform acquisition unit, a current filtering shaping unit, a detection analysis unit, a liquid crystal display unit, an acousto-optic warning unit, a control unit and a communication unit. The detection analysis unit collects a pulse signal output by the current filtering shaping unit and original current data output by the current waveform acquisition unit through high speed I / O and A / D respectively. A pulse density and a current time domain characteristic are combined and used to analyze and determine a fault arc. When the fault arc is detected, an acousto-optic alarm and trip signal is emitted. By using the detection method, the fault arcs of various kinds of loads of a subordinate branch can be identified and are not influenced by superior or other parallel branch fault arcs. Sensitivity is high and a false alarm rate is low. In addition, according to different applications, software and hardware parameters are only configured and a circuit structure does not need to be adjusted; the method and the apparatus can adapt to alternating current / direct current arc detection and a plurality of standards, and versatility is good.

Description

technical field [0001] The invention relates to the field of electrical fire protection, in particular to a fault arc detection method and device based on high-frequency characteristics. Background technique [0002] An arc is a sustained electrical discharge between two electrodes across a medium. A typical arc is formed in the air gap between the cathode and anode. Arc is sudden, concealed and random. Arc can be divided into "good arc" and "bad arc". Arcs during normal operation of the power system (for example, a single arc will be generated by the rotation of the motor and the plug-in switch) are called "good arcs". These arcs will not affect the normal operation of the line and generally will not cause a fire. In low-voltage power distribution lines and equipment, such as electrical wiring, sockets, industrial equipment, household appliances and other internal lines, due to long-term operation or poor electrical connections, the insulation layer of the line will age,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12
Inventor 何林郑傲日孟祥辉梁晓卓
Owner 北京芯同汇科技有限公司
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