CN112394106A - Distribution room system and SF6 gas concentration detection method - Google Patents
Distribution room system and SF6 gas concentration detection method Download PDFInfo
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- CN112394106A CN112394106A CN202011207904.3A CN202011207904A CN112394106A CN 112394106 A CN112394106 A CN 112394106A CN 202011207904 A CN202011207904 A CN 202011207904A CN 112394106 A CN112394106 A CN 112394106A
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- 238000001514 detection method Methods 0.000 title claims abstract description 71
- 238000001914 filtration Methods 0.000 claims abstract description 16
- 238000009413 insulation Methods 0.000 claims description 6
- 238000005192 partition Methods 0.000 claims description 5
- 239000003365 glass fiber Substances 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 37
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 description 29
- 229960000909 sulfur hexafluoride Drugs 0.000 description 29
- 229910018503 SF6 Inorganic materials 0.000 description 28
- 238000012544 monitoring process Methods 0.000 description 12
- 238000000034 method Methods 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000004364 calculation method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010291 electrical method Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000003796 beauty Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/02—Analysing fluids
- G01N29/032—Analysing fluids by measuring attenuation of acoustic waves
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H5/00—Buildings or groups of buildings for industrial or agricultural purposes
- E04H5/02—Buildings or groups of buildings for industrial purposes, e.g. for power-plants or factories
- E04H5/04—Transformer houses; Substations or switchgear houses
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
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- Physics & Mathematics (AREA)
- Architecture (AREA)
- General Physics & Mathematics (AREA)
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- General Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Immunology (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Power Engineering (AREA)
- Acoustics & Sound (AREA)
- Civil Engineering (AREA)
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- Signal Processing (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The invention provides a distribution room system and an SF6 gas concentration detection method, wherein the SF6 gas concentration detection method comprises the steps of collecting background noise and acquiring noise data; outputting a detection sound with a preset frequency; collecting current sound field data; performing noise filtering on the sound field data according to the noise data; the SF6 gas concentration is calculated from the filtered sound field data. And performing noise filtering on the current sound field data according to the noise data, thereby reducing the noise interference of the peripheral environment and ensuring that the accuracy in calculating the SF6 gas concentration is more accurate.
Description
Technical Field
The invention relates to the field of power grid detection and monitoring equipment, in particular to a power distribution room system and an SF6 gas concentration detection method.
Background
Sulfur hexafluoride (SF6) gas has been widely used as an insulating gas with superior performance in power transmission and distribution equipment according to GB 26860-2016 electrical industry safety work rules: the system comprises a power plant and a transformer substation electrical part, a JB/T10893-2008 high-voltage combined electrical apparatus power distribution room sulfur hexafluoride environment monitoring system, a DL 408-1991-electric industry safety work regulations (power plant and transformer substation electrical part), a DL/T639-2016-safety protection detailed rules for sulfur hexafluoride electrical equipment operation, experiments and maintenance personnel, and twenty-five major grid countermeasures of the national grid company. DL 408-1991. safety work of electric power works (electric parts of power plant and substation), especially, it is specified that a distribution equipment room equipped with SF6 equipment must ensure that the concentration of SF6 gas is less than 1000ppm, and besides a strong ventilation device, an oxygen meter capable of alarming, an SF6 gas concentration detection alarm instrument and the like must be installed.
At present, aiming at an SF6 gas concentration online detection technology, optical methods and electrical methods are commonly used in the adopted technology, a corona discharge method of the electrical method is most applied in a monitoring method, the sensors are short in service life and poor in qualitative performance, and environmental gas can be ionized in the detection process to generate toxic gas to generate secondary pollution. For the optical method detection method, although the accuracy is high, the cost is correspondingly high, the core sensing component depends on an imported original, and online monitoring is completed by adopting single sensing through pumping or mirror reflection, so that the reliability is low, the cost performance is low, and the method is limited.
Disclosure of Invention
A first object of the present invention is to provide an SF6 gas concentration detection method that utilizes ambient noise filtering to improve gas detection accuracy.
It is a second object of the present invention to provide a power distribution room system that can utilize ambient noise filtering to improve the accuracy of SF6 gas detection.
In order to achieve the first object of the present invention, the present invention provides a SF6 gas concentration detection method, including: collecting background noise and acquiring noise data; outputting a detection sound with a preset frequency; collecting current sound field data; performing noise filtering on the sound field data according to the noise data; the SF6 gas concentration is calculated from the filtered sound field data.
Further, the step of noise filtering the sound field data according to the noise data includes: inverting the noise data; and filtering background noise of the sound field data according to the inverted noise data by a positive and negative offset algorithm.
In a further aspect, the detection sound with the preset frequency includes a first frequency detection sound, a second frequency detection sound or a third frequency detection sound, and the frequencies of the first frequency detection sound, the second frequency detection sound and the third frequency detection sound are different.
In order to achieve the second object of the present invention, the present invention provides a distribution room system, which includes a sealed chamber, a distribution equipment room, and a gas concentration detection device, wherein the sealed chamber is formed with a sealed cavity, the sealed cavity is used for storing SF6 gas, the distribution equipment is disposed in the sealed cavity, the gas concentration detection device includes a sound field sensor and a sound emitting source, and the sound field sensor and the sound emitting source are located in the sealed cavity.
In a further scheme, the sound field sensor and the sound source are positioned on the same side of the closed chamber, and a middle partition plate is arranged between the sound field sensor and the sound source.
In a further scheme, the middle separator is made of glass fiber.
The sealed chamber is rectangular and comprises a first inner side wall, a second inner side wall, a third inner side wall and a fourth inner side wall, wherein the first inner side wall is opposite to the second inner side wall, and the third inner side wall is opposite to the fourth inner side wall;
sound field sensor and sound source are located and are close to first inside wall, and the second inside wall is provided with the sound reflection district, and third inside wall and fourth inside wall all are provided with inhales the sound piece.
In a further proposal, the outer wall of the closed chamber is provided with a sound insulation member.
The invention has the advantages that the SF6 gas is stored in the closed chamber, the distribution equipment is arranged in the closed chamber, and in order to monitor the concentration of the gas, the sound source and the sound field sensor are respectively used for emitting sound waves and receiving the sound waves, during actual monitoring, background noise can be collected firstly, when the detection sound with preset frequency is emitted, the detection sound can be detected for multiple times by adopting the sound with different frequencies, then the current sound field data is subjected to noise filtering according to the noise data, so that the noise interference of the peripheral environment is reduced, the precision is more accurate when the concentration of the SF6 gas is calculated, and the accuracy of the monitoring data can be enhanced by comparing and monitoring the detection sound by using the frequency conversion sound field technology. Sound insulation, sound absorption and structural arrangement of the distribution room system are utilized, and the sound darkroom is designed, so that the sound field channel acquisition precision is improved.
Drawings
FIG. 1 is a system block diagram of a gas concentration detection device in an embodiment of a distribution room system of the present invention.
FIG. 2 is a schematic diagram of a closed chamber in an embodiment of a panelboard system of the present invention.
Fig. 3 is a flowchart of an embodiment of the SF6 gas concentration detection method according to the invention.
The invention is further explained with reference to the drawings and the embodiments.
Detailed Description
Referring to fig. 1 and 2, the electricity distribution room system includes a sealed chamber 2, a distribution device and a gas concentration detection device, the sealed chamber 2 is formed with a sealed cavity, the sealed cavity is used for storing SF6 gas, the distribution device includes but is not limited to a transformer, a power line, a circuit breaker, a low-voltage switch cabinet, a distribution board, a switch box and a control box, the distribution device is arranged in the sealed cavity, and the sulfur fluoride SF6 gas is used as an insulating gas with superior performance to improve the safety performance of the distribution device.
Airtight cavity 2 is the rectangle setting, airtight cavity 2 includes first inside wall 21, second inside wall 22, third inside wall 23, fourth inside wall 24, roof and diapire, first inside wall 21 is relative with second inside wall 22, third inside wall 23 is relative with fourth inside wall 24, the roof is relative with the diapire, second inside wall 22 is provided with the sound reflection district, first inside wall 21, third inside wall 23 all is provided with fourth inside wall 24 and inhales the sound piece, and the inboard of roof and diapire all is provided with inhales the sound piece, it can adopt and inhale the sound sponge to inhale the sound piece, and airtight cavity 2's outer wall is provided with the sound insulation piece, the sound insulation piece will wrap up whole airtight cavity 2 almost. The closed chamber 2 is further provided with a plurality of sound-absorbing members 26, the sound-absorbing members 26 having a plurality of suction grooves, the sound-absorbing members 26 being arranged in parallel near the second inner side wall 22. The environmental noise of the sealed cavity is greatly reduced by the arrangement of the sound absorbing piece and the sound insulating piece.
The gas concentration detection device comprises a sound field sensor 12 and a sound emitting source 11, the sound field sensor 12 and the sound emitting source 11 are located in a sealed cavity, the sound field sensor 12 and the sound emitting source 11 are located on the same side and located at a position close to a first inner side wall 21, the sound field sensor 12 and the sound emitting source 11 are both arranged towards a sound reflection area, the sound emitting source 11 emits detection sound with preset frequency towards the sound reflection area, the sound field sensor 12 adopts a high-sensitivity pickup device, a middle partition plate 25 is arranged between the sound field sensor 12 and the sound emitting source 11, the middle partition plate 25 is made of glass fibers, and a labyrinth-shaped glass fiber partition plate can be adopted.
The gas concentration detection device also comprises a main control unit 20, an A/D conversion module 19, a pulse frequency generator 18, an amplification module 17, a sound pressure modulation module 16, a waveform setting module 15, a filtering module 14 and a power amplifier 13, wherein the main control unit 20 is provided with an MCU processor and a memory, the main control unit 20 is provided with a self-detection module, an output sound pressure control module, a variable frequency modulation module, a background noise detection module, a gas concentration detection module and a noise reduction data processing module in program, when the sound emitting source 11 is driven to emit, the main control unit 20 is connected with the sound pressure modulation module 16 and the pulse frequency generator 18 and outputs corresponding control signals, the pulse frequency generator 18 is connected with the waveform setting module 15 and outputs pulse signals, then the waveform of the pulse signals is processed by the waveform setting module 15, the sound pressure modulation module 16 and the waveform setting module 15 are connected with the power amplifier 13, and then drives the sound emitting source 11 to emit a detection sound of a preset sound pressure, a preset frequency and a preset waveform.
The detection sound is transmitted in the closed cavity 2, and is reflected by the sound reflection area and then received by the sound field sensor 12, the sound field sensor 12 is connected with the filtering module 14, the filtered data is transmitted to the amplifying module 17, the data is amplified by the amplifying module 17 and then output to the A/D conversion module 19, the A/D conversion module 19 outputs the converted digital signal to the main control unit 20, and the acquired analog signal is converted and then output to the main control unit 20.
Referring to fig. 3, in the practical application of the SF6 gas concentration detection method, step S11 is first performed to collect background noise by the sound field sensor 12 and make the main control unit 20 acquire noise data, and step S12 is finally performed to perform an inversion process on the noise data.
And then outputting detection sound with a preset frequency, wherein the detection sound with different preset frequencies can be selectively adopted during execution, the detection sound with the preset frequency comprises a first frequency detection sound, a second frequency detection sound or a third frequency detection sound, and the frequencies of the first frequency detection sound, the second frequency detection sound and the third frequency detection sound are different. That is, the first frequency detection sound is output through the sound emitting source 11 when step S21 is performed, and then step S22 is performed, the first sound field data is collected through the sound field sensor 12 and output to the main control unit 20, or the second frequency detection sound is output through the sound emitting source 11 when step S31 is performed, and then step S32 is performed, the second sound field data is collected through the sound field sensor 12 and output to the main control unit 20, or the third frequency detection sound is output through the sound emitting source 11 when step S41 is performed, and then step S42 is performed, the third sound field data is collected through the sound field sensor 12 and output to the main control unit 20.
Taking the first frequency detection sound and the first sound field data as an example, step S13 is finally executed to perform background noise filtering on the first sound field data according to the inverted noise data by using a positive-negative cancellation algorithm, and then, as in step S14, the filtered sound field data is obtained.
Then, step S15 is executed, the sound field data is brought into a formula algorithm of sound attenuation and sound pressure to calculate the SF6 gas concentration, specifically, reference may be made to "sulfur hexafluoride concentration wireless sensor based on sound wave attenuation", which is written in the literature of "silver beauty," and the calculation scheme disclosed therein realizes the calculation of the SF6 gas concentration by an attenuation formula of sound wave and distance, an attenuation system formula of alpha medium of sound wave propagation, a formula of sound pressure value after sound wave attenuation, and some key parameters such as temperature T, detection channel length x, sound wave angular frequency, medium gas density, heat conductivity, molar mass of gas, etc., in cooperation with Matlab. Then, in step S16, an SF6 gas concentration value at the corresponding frequency is obtained, and finally, step S17 is performed to store the related data.
Furthermore, SF6 gas concentration calculation can be performed through the three detection sound and sound field data with different frequencies, so that reference comparison can be performed, and the monitoring precision is improved. In addition, the noise data inversion processing can be performed after the sound field data is collected and before the background noise is filtered, and the purpose of the invention can be achieved. The main control unit 20 can be provided with a remote communication module, and then can be connected with a cloud server, so that online monitoring of a cloud can be realized.
From top to bottom, through setting up airtight cavity storage SF6 gas, and set up distribution equipment in it, in order to control gaseous concentration, the event sends the sound wave respectively and receives the sound wave through sound source and sound field sensor, when actual monitoring, can gather background noise earlier, send the detection sound of predetermined frequency, detection sound still can adopt the sound of different frequencies to carry out a lot of detection, then carry out noise filtering to current sound field data according to noise data, thereby reduce peripheral ambient noise and disturb, precision when calculating SF6 gas concentration is more accurate, and the detection sound that utilizes frequency conversion sound field technique carries out contrast monitoring can strengthen monitoring data's the degree of accuracy. Sound insulation, sound absorption and structural arrangement of the distribution room system are utilized, and the sound darkroom is designed, so that the sound field channel acquisition precision is improved.
Claims (8)
- The SF6 gas concentration detection method is characterized by comprising the following steps:collecting background noise and acquiring noise data;outputting a detection sound with a preset frequency;collecting current sound field data;performing noise filtering on the sound field data according to the noise data;calculating SF6 gas concentration from the sound field data after filtering.
- 2. The SF6 gas concentration detection method of claim 1, wherein:the step of noise filtering the sound field data according to the noise data includes:inverting the noise data;and filtering background noise of the sound field data according to the inverted noise data by a positive and negative offset algorithm.
- 3. The SF6 gas concentration detection method of claim 1 or 2, wherein:the detection sound with the preset frequency comprises a first frequency detection sound, a second frequency detection sound or a third frequency detection sound, and the frequencies of the first frequency detection sound, the second frequency detection sound and the third frequency detection sound are different.
- 4. A power distribution room system, comprising:the device comprises a closed chamber, a gas storage chamber and a gas distribution chamber, wherein a sealed cavity is formed in the closed chamber and is used for storing SF6 gas;a power distribution device disposed within the sealed cavity;the gas concentration detection device comprises a sound field sensor and a sound emitting source, wherein the sound field sensor and the sound emitting source are located in the sealed cavity.
- 5. The electrical distribution room system of claim 4, wherein:the sound field sensor and the sound emitting source are located on the same side of the closed chamber, and a middle partition plate is arranged between the sound field sensor and the sound emitting source.
- 6. The electrical distribution room system of claim 5, wherein:the middle clapboard is made of glass fiber.
- 7. The electrical distribution room system of claim 5 or 6, wherein:the closed chamber is arranged in a rectangular shape and comprises a first inner side wall, a second inner side wall, a third inner side wall and a fourth inner side wall, wherein the first inner side wall is opposite to the second inner side wall, and the third inner side wall is opposite to the fourth inner side wall;the sound field sensor with it is located to send out the sound source and be close to first inside wall, the second inside wall is provided with the sound reflection district, the third inside wall with the fourth inside wall all is provided with inhales the sound piece.
- 8. The electrical distribution room system of claim 7, wherein:and a sound insulation piece is arranged on the outer wall of the closed cavity.
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