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Electric arc quenching detection method based on optical signal

A detection method and optical signal technology, which is applied in the direction of electrical components, circuit devices, emergency protection circuit devices, etc., can solve the problem that arc faults endanger personal safety and equipment safety, arc protection technology and devices are not reliable, and ground faults are prone to occur and other problems, to achieve the effect of increasing the difference, improving the accuracy and reliability, and protecting the speed quickly

Pending Publication Date: 2022-03-08
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The internal and external working environment of medium-voltage distribution network switchgear is complex, and ground faults are prone to occur. The fault arc generated seriously endangers personal safety and equipment safety. The reliability and sensitivity of existing arc protection technology and devices are not high.

Method used

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  • Electric arc quenching detection method based on optical signal
  • Electric arc quenching detection method based on optical signal
  • Electric arc quenching detection method based on optical signal

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Embodiment 1: as figure 1 As shown, an optical signal-based arc extinction detection method, the specific steps are:

[0037] Step1: By collecting optical signals in real time.

[0038] Step2: Convert the collected optical signal into electrical signal.

[0039] Step3: Convert the electrical signal to AD to obtain an analyzable digital signal.

[0040] Step4: Obtain the ultraviolet light intensity increment of a specific band in the digital signal and visible light intensity increment .

[0041] Step5: Increase the intensity of the ultraviolet light and visible light intensity increment Compared with the set threshold value, the arc extinction detection and judgment are carried out.

[0042] Specifically:

[0043] Step5.1: Set the time within the change of the collected fault optical signal increment to 20ms, and increase the ultraviolet light intensity and visible light intensity increment Compared with the set threshold value, its discriminant calculat...

Embodiment 2

[0058] Example 2: Under the voltage level of 35kV, the spectral signal characteristics and electrical signal characteristics of the arc starting stage are detected, and the arc gap is 5cm at this time. Optical signal acquisition device parameter setting: Set the parameters of the acquisition group window, the data update rate is 0ms, the integration time is 1ms, the number of spectra is set to 5000, the trigger mode is level trigger, and then click start, an external High level signal, external trigger device level voltage is 3.05V.

[0059] Step1: Real-time collection of arc light signal data when the medium-voltage distribution network switchgear is faulty, including connecting one end of the optical fiber to the visible light and ultraviolet light spectrometer, and fixing the other end with an optical fiber fixing bracket, placing it 1m away from the fault arc gap, and adjusting the optical fiber Position it so that it faces the middle of the gap; connect the two spectromet...

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Abstract

The invention relates to an arc quenching detection method based on optical signals, and belongs to the technical field of power system relay protection. Whether the arc is extinguished or not is judged by detecting the ultraviolet light intensity variable and the visible light intensity variable of the arc specific wave band when the medium-voltage power distribution network switch cabinet breaks through the bottleneck that the grounding fault weak current is small and difficult to detect, and the situation that the arc develops into a stable fault when the medium-voltage power distribution network switch cabinet has the grounding fault is avoided; permanent faults are prevented from being formed, and the operation safety and reliability of the medium-voltage power distribution network switch cabinet are improved. According to the detection method, the grounding arc of the medium-voltage power distribution network switch cabinet is prevented from developing into a stable arc, permanent faults are prevented from being formed, the operation safety and the power supply reliability of the medium-voltage power distribution network switch cabinet are improved, and meanwhile the requirements for the reliability, the sensitivity, the selectivity and the quickness of power system control protection are met.

Description

technical field [0001] The invention relates to an arc extinction detection method based on an optical signal, and belongs to the technical field of electric power system relay protection. Background technique [0002] In daily life and industry, the use of various electrical equipment may cause fires. The occurrence of fire will bring a lot of human and financial losses. There are two main reasons for electrical fires: electrical fires caused by current factors and electrical fires caused by fault arcs. Electrical fires caused by current factors are mainly short-circuit and overload. This factor usually triggers the circuit breaker or air switch due to the large current generated to cut off the power supply instantaneously to avoid fire. The fire caused by the fault arc is mainly caused by the oxidation, aging, virtual connection and loosening of the wire sheath. The arc factor can easily ignite nearby combustible substances due to the continuous high temperature caused ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H1/00H02H3/00
CPCH02H1/0023H02H3/006
Inventor 束洪春董俊侯炜邵重阳黄华林丁心志李瑞桂杨建平杨翔麟唐玉涛韩一鸣
Owner KUNMING UNIV OF SCI & TECH
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