Low-voltage series fault arc detection system

A fault arc and detection system technology, applied in the field of circuits, can solve the problems of arc instability, arc fault detection interference, nonlinear characteristics (with harmonics or inter-harmonics, etc.), to ensure accuracy and unity. , the effect of improving stability

Active Publication Date: 2019-12-10
HENAN POLYTECHNIC UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

The detection of series arc faults in low-voltage power distribution systems faces the following difficulties: First, the load combinations of low-voltage power distribution systems are various. During normal operation, the loop current waveform may mainly show linear characteristics (no harmonics), or may It mainly shows nonlinear characteristics (with harmonics or interharmonics). The load current waveform with nonlinear

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  • Low-voltage series fault arc detection system

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Embodiment 1

[0013] Embodiment 1, a low-voltage series fault arc detection system, including a voltage detection circuit, a signal adjustment circuit and an operational amplifier emission circuit, the voltage detection circuit collects the low-voltage series fault arc voltage, and the signal adjustment circuit uses an operational amplifier AR1 and a diode D1, a diode D2 constitutes an average value circuit to filter out the average value signal, and at the same time uses transistor Q2 and transistor Q3 to form a push-pull circuit to prevent signal crossover distortion, input it into the non-inverting input terminal of op amp AR3, and use op amp AR2 and diode D3, diode D4 and op amp The amplifier AR5 forms an absolute value circuit, and after being detected by the detection circuit composed of the thyristor VTL1 and the voltage regulator tube D5, it is input to the inverting input terminal of the operational amplifier AR3, and the triode Q1 detects the potential difference between the output ...

Embodiment 2

[0016] Embodiment 2, on the basis of Embodiment 1, the operational amplifier transmitting circuit uses the operational amplifier AR4 to amplify the signal in phase, and sends it to the control terminal of the arc detection system through the signal transmitter E1, so that the control terminal can detect the low-voltage series fault arc in real time state, the non-inverting input terminal of the operational amplifier AR3 is connected to the output terminal of the operational amplifier AR3 and one end of the resistor R13, the inverting input terminal of the operational amplifier AR4 is connected to one end of the resistor R14, and the other end of the resistor R14 is grounded, and the operational amplifier AR4 The other end of the output terminal of the resistor R13 and one end of the resistor R15, the negative pole of the voltage regulator tube D6, the positive pole of the voltage regulator tube D6 is grounded, and the other end of the resistor R15 is connected to the signal tran...

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Abstract

The invention discloses a low-voltage series fault arc detection system. The system comprises a voltage detection circuit, a signal conditioning circuit and an operational amplifier transmitting circuit, the voltage detection circuit collects low-voltage series fault arc voltage; the signal conditioning circuit uses an operational amplifier AR1, a diode D1 and a diode D2 to form a mean value circuit to screen out mean value signals. Meanwhile, a triode Q2 and a triode Q3 are used for forming a push-pull circuit to prevent signal crossover distortion; an input operational amplifier AR3 is arranged in the in-phase input end; an absolute value circuit is formed by an operational amplifier AR2, a diode D3, a diode D4 and an operational amplifier AR5; after being detected by a detection circuitconsisting of a silicon controlled rectifier VTL1 and a voltage stabilizing tube D5, the signal is input into an inverting input end of an operational amplifier AR3; and finally, an operational amplifier transmitting circuit uses an operational amplifier AR4 to amplify the signal in the same phase, the signal is transmitted to the arc detection system control terminal through a signal transmitterE1, and the signal is converted into series fault arc state detection through voltage change and directly transmitted to the arc detection system control terminal.

Description

technical field [0001] The invention relates to the field of circuit technology, in particular to a low-voltage series fault arc detection system. Background technique [0002] At present, the hidden dangers of series arc faults may be distributed in the entire low-voltage power distribution system. There are many causes of series arc faults, such as: wire insulation aging, internal conductors being squeezed and broken, or poor contact of wires. The detection of series arc faults in low-voltage power distribution systems faces the following difficulties: First, the load combinations of low-voltage power distribution systems are various. During normal operation, the loop current waveform may mainly show linear characteristics (no harmonics), or may It mainly shows nonlinear characteristics (with harmonics or interharmonics). The load current waveform with nonlinear characteristics may be very similar to the current waveform when there is a series arc fault in the circuit, whi...

Claims

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Application Information

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IPC IPC(8): G01R31/12
CPCG01R31/12G01R31/1227
Inventor 余琼芳杨艺余琼霞赵来军胡亚倩路文浩
Owner HENAN POLYTECHNIC UNIV
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