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Acoustical method and device for detecting low-concentration sulfur hexafluoride gas

A technology of sulfur hexafluoride gas and acoustic devices, which is applied in the direction of detecting the appearance of fluid at the leakage point and using liquid/vacuum degree for liquid tightness measurement, etc., which can solve the difficulty in reconciling the detection accuracy of the sound velocity method or propagation delay method and detection range to achieve the effect of easy miniaturization, low power consumption and simple structure

Active Publication Date: 2013-01-23
JIANGSU JIUCHUANG ELECTRICAL S T
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  • Summary
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to provide an acoustic method and device for detecting low-concentration sulfur hexafluoride gas with good detection effect and high precision, so as to solve the problem of difficulty in reconciling the detection accuracy and the existing sound velocity method or propagation delay method. The contradiction between detection ranges overcomes the deficiencies of existing technologies

Method used

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  • Acoustical method and device for detecting low-concentration sulfur hexafluoride gas
  • Acoustical method and device for detecting low-concentration sulfur hexafluoride gas
  • Acoustical method and device for detecting low-concentration sulfur hexafluoride gas

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Embodiment 1

[0030] Such as figure 1 , 2, Shown in 4, a kind of acoustic method of low-concentration sulfur hexafluoride gas detection, the step of described detection is:

[0031] Step a, the pulse modulation wave is sent by the microcomputer unit 1, and the timer starts counting;

[0032] Step b, after the pulse modulation wave is amplified by the power of the driving unit 2, it drives the transmitting end of the acoustic wave transmitting transducer 3 and emits sound waves, and the acoustic wave transmitting transducer 3 is mounted on a length of One end of the detection channel 8;

[0033] Step c, the sound wave that the sound wave emitting transducer 3 sends passes through a length of After the detection channel 8, it is received by the sound wave receiving transducer 4 installed at the other end of the detection channel 8, and the sound wave receiving transducer 4 converts the received sound wave into an electrical signal;

[0034] Step d, after the electrical signal output by ...

Embodiment 2

[0047] Such as figure 1 , 2 , 3, an acoustic device for detecting low-concentration sulfur hexafluoride gas, including a microcomputer unit 1 with a built-in timer, a drive unit 2, an acoustic wave transducer, a signal conditioning unit 5, a temperature sensor module 6, and a communication interface The unit 7 and the detection channel 8 containing the detection gas mixed with sulfur hexafluoride; the acoustic wave transducer includes an acoustic wave transmitting transducer 3 and an acoustic wave receiving transducer 4, and the acoustic wave transmitting transducer 3 and the acoustic wave receiving transducer The transducers 4 are installed at both ends of the detection channel 8 respectively; the output end of the microcomputer unit 1 is electrically connected with the acoustic wave transmitting transducer 3 installed at one end of the detection channel 8 through the drive unit 2, and is installed at the other end of the detection channel 8 The acoustic wave receiving trans...

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Abstract

The invention discloses an acoustical method and a device for detecting low-concentration sulfur hexafluoride gas. The method comprises the following steps of: utilizing a relation between velocity of ultrasonic wave transmitting in gas and gas molar mass, measuring travel time when the acoustic wave passes through a detection channel with fixed length by a method of amplitude modulation and envelope detection applied to communication, calculating the travel time in air without mixed sulfur hexafluoride under a current environmental condition at the same time, and representing sulfur hexafluoride concentration by use of time difference of ultrasonic wave detection propagation delay and reference propagation delay. The method has a good detection effect and high precision, and problems of insufficient detection precision of the travel time and a cross cycle in a conventional low-concentration sulfur hexafluoride acoustic velocity detection technology are solved, and precise detection of low-concentration sulfur hexafluoride concentration in a single channel manner is realized.

Description

technical field [0001] The invention relates to an acoustic method and device for detecting low-concentration sulfur hexafluoride gas, which is applied to medium-voltage, high-voltage and ultra-high-voltage circuit breakers in electric power systems to detect the leakage of sulfur hexafluoride gas insulation and arc extinguishing medium online test. Background technique [0002] Sulfur hexafluoride (SF 6 ) is a gas with excellent electrical insulating and arc-extinguishing properties. The low-concentration sulfur hexafluoride refers to sulfur hexafluoride with a concentration in the range of 0-3000ppm. In the power industry, SF 6 Widely used in conductance equipment series, such as power switches, closed capacitor banks, transformers, etc. In operation, SF 6 The leakage of gas is inevitable. When a large current is interrupted, some sulfur-containing low-fluoride compounds will be produced in the leakage site due to strong arc discharge. These substances have a strong ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M3/24
Inventor 单鸣雷朱昌平韩庆邦陈秉岩汤一彬高远殷澄黄波李建张秀平姚澄
Owner JIANGSU JIUCHUANG ELECTRICAL S T
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