DC fault arc detection and protection device

An arc detection and protection device technology, applied in emergency protection circuit devices, circuit devices, emergency protection devices with automatic disconnection, etc. verification and other problems, to achieve the effect of simple structure, high detection accuracy and fast response time

Inactive Publication Date: 2019-01-18
CHONGQING UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing time-domain analysis results of current and voltage are not necessarily caused by arc faults, and the accuracy needs to be verified.
The detection of arc light, arc sound, temperature, etc. has

Method used

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  • DC fault arc detection and protection device
  • DC fault arc detection and protection device
  • DC fault arc detection and protection device

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Embodiment Construction

[0050] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0051] Such as figure 1 As shown, this embodiment discloses a DC fault arc detection and protection device, including a current transformer, an amplifier, a band-pass filter, a high-precision ADC, a digital signal processor (DSP) and an IGBT circuit breaker.

[0052] The frequency domain analysis of the arc current in the early stage shows that the high frequency components of the arc current are mainly concentrated in the frequency range of 30-100kHz. In order to measure the high-frequency component of the arc current, the high-frequency current component can be coupled through a high-frequency current transformer. The model of the transformer used in this embodiment is PA3655, the coil turns ratio is 1:200, and the pass frequency band is 50kHz-500kHz. Since the amplitude of the coupled signal is relatively small, a precision operational...

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PUM

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Abstract

The invention relates to a DC fault arc detection and protection device, and belongs to the field of electrical engineering. The device comprises a high-frequency current transformer, a Hall current sensor, an amplifier, a bandpass filter, a high-precision ADC, a digital signal processor (DSP) and an IGBT circuit breaker, an output terminal of the high-frequency current transformer is connected with an input terminal of the amplifier, an output terminal of the amplifier is connected with an input terminal of the bandpass filter, an output terminal of the bandpass filter is connected with an input terminal of an AD sampling circuit, an output terminal of the AD sampling circuit is connected with an input terminal of the digital signal processor, and an output terminal of the digital signalprocessor (DSP) is connected with the IGBT circuit breaker. A current signal obtains a high-frequency current component through coupling via the high-frequency current transformer, the signal is amplified by 10 times through the amplifier and then passes through the bandpass filter, the ADC samples the signal and transmits the signal to the DSP for algorithm processing, the Hall current sensor transmits a detected DC current value to the DSP for dynamic threshold calculation, and an arc is extinguished through the circuit breaker after detection of arc generation so that protection is realized.

Description

technical field [0001] The invention belongs to the field of electrical engineering and relates to a DC fault arc detection and protection device. Background technique [0002] With the continuous development of social economy, high-power power electronic devices have been widely used. What followed was the rapid popularization of DC systems in aerospace, solar power generation, and large-scale power grid energy storage. In a DC system, loose metal connectors, animal bites, and damage to insulation layers such as transmission lines may cause DC arcs. [0003] Since the DC fault arc does not have the zero-crossing characteristics of the AC fault arc, the arc is not easy to extinguish; in addition, when a fault arc occurs, especially when a series DC fault arc occurs, it is similar to a resistor connected in series, and the circuit current will drop instead, and cannot reach the circuit breaker and fuse. Therefore, these protective devices are powerless to protect DC fault a...

Claims

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Application Information

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IPC IPC(8): G01R31/12H02H3/00H02H1/00
CPCG01R31/12H02H1/0015H02H3/00
Inventor 熊兰钟培文曾泽宇李春来杨军杨子康范禹邑刘璇
Owner CHONGQING UNIV
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