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Direct-current arc fault detection protection method and method and detection circuit

A technology for fault detection circuits and DC arcs, applied in emergency protection circuit devices, emergency protection devices for automatic disconnection, measurement devices, etc., can solve the problems of complex arc detection methods and devices, poor real-time performance and speed of detection, and high implementation costs. Problem, approach and effect of simple implementation, high speed of fault detection, low cost of implementation and manufacture

Active Publication Date: 2014-05-21
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0005] The above-mentioned arc detection methods and devices are relatively complicated. Generally, digital microcomputer chips such as MCU, DSP or FPGA must be used to realize the arc fault detection algorithm. The real-time performance and speed of detection are slightly poor, and the implementation cost is also high.

Method used

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  • Direct-current arc fault detection protection method and method and detection circuit
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Embodiment Construction

[0028] Some key technologies involved in the present invention will be described in detail below in conjunction with the accompanying drawings to support the claims.

[0029] DC arc fault detection and protection methods such as figure 1 shown.

[0030] Step 1: Detect the AC component of the power circuit current through the AC component detection circuit, and the AC component detection circuit can use a current transformer or a current detection resistor;

[0031] Step 2: performing limiting processing on the AC component detected in step 1;

[0032] Step 3: Perform band-pass filter processing on the signal obtained after the limiting process in step 2. The center frequency of the band-pass filter is about 10 kHz, the lower limit frequency is about 1 kHz, and the upper limit frequency is about 100 kHz;

[0033] Step 4: performing absolute value processing on the signal obtained after the band-pass filter processing in step 3;

[0034] Step 5: When the absolute value obtain...

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Abstract

The invention discloses a direct-current arc fault detection protection method and method and a detection circuit. Accumulated energy of high-frequency component in alternating component of arc current in a specific time period is adopted as a basis for judging whether an arc fault occurs or not. The direct-current arc fault detection protection device comprises a solid-state switch or a mechanical relay, an alternating component detection circuit and a first AND gate and direct-current arc fault detection circuit. The direct-current arc fault detection protection method is simple, quick in detection speed and high in reliability, a direct-current arc fault detection function is conveniently achieved by adopting an analog-digital integrated circuit, and the achieving and manufacturing cost is low. The direct-current arc fault detection protection method and method can be widely applied to low-voltage and high-voltage power systems of airplanes, ships and warships, photovoltaic cell systems and civilian high-voltage direct-current power transmission and distribution systems.

Description

technical field [0001] The invention relates to a detection and protection method, device and detection circuit for an arc fault in a DC power system, and belongs to the technical field of electric engineering. Background technique [0002] Arc faults caused by aging insulation properties of wires and cables, insulation damage, air humidity, and loose connection terminals are likely to cause direct or indirect damage to power supply and distribution systems and electrical equipment. According to the nature of the power system where the arc fault is located, it can be divided into AC arc fault and DC arc fault. Accompanied by sparks, bright light and high temperature, arc faults will cause further damage to the insulation of wires and cables, and even cause electrical fires. [0003] The characteristics of DC arc faults are very different from those of AC arc faults: AC arc current is periodic and there is a "zero rest zone" when it crosses zero; while DC has no periodicity,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/02G01R31/00
Inventor 王莉阮立刚
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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