CN104007082A - Device for detecting concentration of SF6 in GIS pipeline off line - Google Patents

Device for detecting concentration of SF6 in GIS pipeline off line Download PDF

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Publication number
CN104007082A
CN104007082A CN201410221994.XA CN201410221994A CN104007082A CN 104007082 A CN104007082 A CN 104007082A CN 201410221994 A CN201410221994 A CN 201410221994A CN 104007082 A CN104007082 A CN 104007082A
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gas
concentration
standard
mixed gas
voltage
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CN201410221994.XA
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CN104007082B (en
Inventor
王欢
项琼
汪本进
王晓琪
李璿
徐思恩
岳长喜
刘浩
朱凯
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
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Abstract

The invention provides a device for detecting concentration of SF6 in a GIS pipeline off line. The device comprises a light source module and a signal analysis module which are respectively connected with a gas tank module, wherein the gas tank module comprises a standard tank and a sampling tank which are used for storing a standard SF6 mixed gas and a to-be-tested SF6 mixed gas, respectively; the light source module is used for emitting infrared light to the gas tank module; the signal analysis module is used for analyzing the concentration of the to-be-tested SF6 mixed gas in the sampling tank according to an infrared light signal and an SF6 gas database. Compared with the prior art, the device provided by the invention can be used for accurately measuring the concentration of SF6 in the GIS pipeline, and is simple in operation and high in reliability.

Description

SF in a kind of GIS pipeline 6concentration off-line detection device
Technical field
The present invention relates to a kind of gas concentration off-line detection device, be specifically related to SF in a kind of GIS pipeline 6concentration off-line detection device.
Background technology
SF 6gas is because its stronger electronegativity, high-termal conductivity, good physicochemical property and insulation arc extinction performance are widely used in high-voltage electrical apparatus industry, be mainly used in primary cut-out, gas insulated metal enclosed swit chgear, bus duct etc., also for mutual inductor, lightning arrester.But SF 6be the heavy gas that molecular weight is larger, condensing temperature is higher, inapplicable extremely frigid zones; SF 6under the high temperature action of electric arc, may generate SO 2deng corrosive substance and SOF 2deng extremely toxic substance; SF 6the electric strength of gas is subject to the impact of inhomogeneous field electrically conductive particles and electrode surface roughness and sharply declines; SF 6environment is had to very large harm, and its greenhouse effect index GWP (global warming potential) is very high, is approximately CO 230,000 times.
The SF that use at present more 6/ N 2or SF 6/ CO 2mixed gas replaces pure SF as insulating medium 6gas, thus SF reduced as far as possible 6the use amount of gas.
When adopting pure SF in GIS pipeline 6when gas, need not investigate its gas uniform, but adopt SF 6when mixed gas, need homogeneity and concentration to gas to investigate.For example adopt SF 6/ N 2mixed gas, due to SF 6gas and N 2the density difference of gas, is filled with the larger SF of density after GIS pipeline 6gas can sink to down downside in pipeline, and the less N of density 2gas can be present in the middle upside of pipeline, so from start to be inflated to charge SF how long 6gas and N 2the mixed gas of gas approaches and is uniformly distributed in theory, and GIS how long, just can bring into use when which kind of state mixed gas reach after inflation; In the operational process of GIS station, whether pipe interior there is Leakage Gas situation, supplements which kind of gas make-up amount and be how many after occurring to leak, while leaking into what degree this station should carry out immediately major tune-up etc. be all need to solution problem.So before the GIS of mixed gas pipeline puts into operation, developing can the interior SF of quantitative analysis of pipeline 6the equipment of gas concentration is necessary.
Summary of the invention
In order to meet the needs of prior art, the invention provides SF in a kind of GIS pipeline 6concentration off-line detection device, described device comprises the light source module and the signal analyse block that are connected with gas tank module respectively;
Described gas tank module comprises standard can and sample can, is respectively used to storage standards SF 6mixed gas and SF to be measured 6mixed gas;
Described light source module, for launching infrared light to described gas tank module;
Described signal analyse block, for the described infrared signal of foundation and SF 6gas data storehouse, to SF to be measured in sample can 6the concentration of mixed gas is analyzed.
Preferably, described standard can and sample can include a gas regulation port and two fiber ports;
When described gas regulation port is connected with the inflatable interface of GIS pipeline, for gathering standard SF 6mixed gas and SF to be measured 6mixed gas; Pressure control device detects the atmospheric pressure value in tank body in real time, and when described atmospheric pressure value exceedes after setting value, described pressure control device cuts out described gas regulation port and sends warning message;
Preferably, described pressure control device comprises single-chip microcomputer and pressure transducer; The tank interior force value that described single-chip microcomputer gathers according to pressure transducer is adjusted the open and-shut mode of gas admittance valve and air outlet valve;
Preferably, described light source module comprises infrared light supply, filter plate and optical splitter;
Described filter plate carries out filtering for the infrared light that is 1～20 μ m to the wavelength of infrared light supply transmitting; Described optical splitter is divided into two bundle infrared lights by filtered infrared light according to the ratio of 1:1, is transmitted into respectively standard can and sample can;
Preferably, described signal analyse block comprises photodetector and PC; Described photodetector, is respectively used to measure the power signal of the infrared light after the transmission of standard can and sample can, and described power signal is converted to voltage signal sends in described PC;
Preferably, described PC comprises data acquisition unit, data analysis unit and SF 6gas data storehouse;
Described data analysis unit will be carried out difference computing with the magnitude of voltage of standard can and the tank connected photodetector output of sampling respectively, and by operation result and described SF 6concentration-voltage curve in gas data storehouse compares, thereby obtains SF in sample can 6sF in mixed gas 6the concentration of gas;
Preferably, the construction method of described concentration-voltage curve comprises:
Step 1: when temperature constant, obtain SF to be measured 6sF in mixed gas 6the difference of the magnitude of voltage of photodetector output described in when gas concentration is followed successively by 60%～80%, thus build constant temperature-concentration-voltage curve;
Step 2: be that all constant temperature-concentration-voltage curves in-20 DEG C～50 DEG C build described concentration-voltage curve according to temperature range;
Preferably, SF described in described step 1 6gas concentration increases progressively with 0.1% interval; The benchmark that calculates described difference is and the magnitude of voltage of the tank connected photodetector output of standard zero point;
In described step 2 with all described constant temperature-concentration-voltage curves within the scope of interval acquiring-20 of 1 DEG C DEG C～50 DEG C.
Compared with immediate prior art, excellent effect of the present invention is:
1, in technical solution of the present invention, light source module adopts infrared light supply and filter plate, has reduced the cost of light source device;
2, in technical solution of the present invention, adopt optical splitter, according to 1:1 ratio, infrared light is divided into the light beam that two beam powers are identical, guarantee that detection accuracy has reduced the requirement to light source stability simultaneously;
3, in technical solution of the present invention, pressure control device is controlled tank interior pressure automatically by Single-chip Controlling pressure transducer, guarantees that the internal pressure of standard can and sample can is the same, ensures the accuracy of measurement data;
4, SF in a kind of GIS pipeline provided by the invention 6concentration off-line detection device, adopts control methods by the SF to be measured gathering in GIS pipeline 6mixed gas and standard SF 6mixed gas is compared, and the voltage signal of the infrared light power through it is carried out to difference computing, according to SF 6the anti-SF obtaining in current GIS pipeline that pushes away in gas data storehouse 6gas concentration;
5, SF in a kind of GIS pipeline provided by the invention 6concentration off-line detection device, can mix situation for detection of the gas in the each region of GIS pipe interior, thereby whether reaches working stamndard before judging GIS conduit running;
6, SF in a kind of GIS pipeline provided by the invention 6concentration off-line detection device, the concentration that is applicable to other kinds mixed gas detects.
Brief description of the drawings
Below in conjunction with accompanying drawing, the present invention is further described.
Fig. 1 is: SF6 concentration off-line detection device structural drawing in a kind of GIS pipeline in the embodiment of the present invention;
Fig. 2 is: SF in the embodiment of the present invention 6the structure process flow diagram in gas data storehouse;
Fig. 3 is: in the embodiment of the present invention according to SF 6gas data storehouse obtains SF 6the process flow diagram of gas concentration.
Embodiment
Describe embodiments of the invention below in detail, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has the element of identical or similar functions from start to finish.Be exemplary below by the embodiment being described with reference to the drawings, be intended to for explaining the present invention, and can not be interpreted as limitation of the present invention.
Fig. 1 shows SF in a kind of GIS pipeline provided by the invention 6concentration off-line detection device, comprises light source module, gas tank module and signal analyse block;
1, light source module comprises infrared light supply, filter plate and optical splitter;
Infrared light supply is the infrared light of 1～20 μ m for emission wavelength;
Centered by filter plate, wavelength is the filter plate of 10.6 μ m, for above-mentioned infrared light is carried out to filtering, obtains the infrared light that wavelength is 10.6 μ m;
Optical splitter is that the infrared light of 10.6 μ m is divided into two bundle infrared lights according to the ratio of 1:1 by wavelength, is transmitted into respectively in standard can and sample can.
Above-mentioned infrared light transmits by optical fiber in gas tank, and in order to reduce the energy loss of infrared light in Optical Fiber Transmission process, the length of optical fiber should be as far as possible short.For example G.652 the loss of optical fiber comprises: the average loss at 1550nm window is about 0.25dB/km, the splicing loss when welding of lightguide cable link fibre core; Wherein each fusion splice loss is about 0.05dB, and the junction loss of each flexible jumper, generally gets 0.5dB/km when calculating.
2, gas tank module comprises standard can and sample can, is respectively used to storage standards SF 6mixed gas and SF to be measured 6mixed gas; Standard can and sample can include a gas regulation port and two fiber ports;
Standard SF 6mixed gas, for each gas component ratio in mixed gas is known mixed gas, as the standard SF of the present embodiment Plays tank 6mixed gas is 75%SF 6gas and 25%N 2the mixed gas of gas composition;
The effect of gas regulation port:
1.: be tank body vacuum pumping opening;
2.: for gathering standard SF 6mixed gas and SF to be measured 6mixed gas; When gas regulation port is connected with the inflatable interface of GIS pipeline, pressure control device detects the SF in gas tank in real time 6mixed gas atmospheric pressure value;
Pressure control device comprises that model is single-chip microcomputer and the pressure transducer of MPS430-11;
Pressure transducer comprises gas admittance valve, air outlet valve, power lead and control line; Wherein gas admittance valve is connected with tank body with the valve of giving vent to anger, and control line is connected with single-chip microcomputer;
Single-chip microcomputer is used for gathering tank interior pressure numerical value, by-pass valve control switch and carries out alarm;
In the time that tank interior pressure does not reach the setting value of single-chip microcomputer, pilot lamp on single-chip microcomputer is bright all not to work, and air intake valve keeps open state, and the valve of giving vent to anger keeps closed condition; In the time that pressure reaches setting value, the green indicating lamp on single-chip microcomputer lights, and air intake valve is switched to closed condition, and the valve of giving vent to anger keeps closed condition; In the time that pressure exceedes setting value, red led lights, and emergency alarm bell sounds simultaneously, and air intake valve keeps closing, and the valve of giving vent to anger reaches setting value in open state until reach internal pressure, and red led extinguishes, and the valve closing of giving vent to anger completes pressure and regulates.
The effect of fiber port:
Fiber port is connected with the optical splitter of light source module and the photodetector of signal analyse block respectively, for the infrared light of transmission light source module transmitting.
3, signal analyse block comprises photodetector and PC;
Photodetector, for measuring the power signal of the infrared light after the transmission of standard can and sample can, and is converted to voltage signal by power signal and sends in PC;
PC comprises data acquisition unit, data analysis unit and SF 6gas data storehouse;
Data analysis unit is that the voltage signal of standard can and the output of sample can end is carried out to difference calculation process, and by operation result and SF 6concentration-voltage curve in gas data storehouse compares, thereby obtains SF in sample can 6the concentration of mixed gas.
SF 6gas data storehouse adopts infrared light to pass through respectively standard SF 6the SF to be measured of mixed gas and principal component 6mixed gas transmission, when infrared light is by SF 6after gas absorption, the difference of voltage signal builds; Due to SF 6gas is the absorptivity difference to light under different temperatures and different pressure, is controlling under the prerequisite of identical pressure, and temperature becomes one of the most important factor of absorptivity that affects, and therefore needs to describe out standard SF under different temperatures 6the voltage curve of mixed gas.With standard SF 6the magnitude of voltage of mixed gas is as benchmark zero point, SF 6the concentration of gas is lower, larger with the difference at benchmark zero point, SF 6the concentration of gas is higher, less with the difference at benchmark zero point, works as SF 6the concentration of gas is lower than standard SF 6sF in mixed gas 6the magnitude of voltage obtaining when gas concentration, for just, is worked as SF 6the concentration of gas is higher than standard SF 6sF in mixed gas 6the magnitude of voltage obtaining when gas concentration is for negative.To SF 6the SF to be measured of gas concentration the unknown 6when mixed gas is measured, in concentration-voltage curve, be back-calculated to obtain corresponding SF according to the difference of the voltage signal obtaining 6concentration data.
In the present embodiment, in GIS pipeline, the SF6 concentration off-line detection device course of work is:
(1): production standard tank and sample can:
1.: the standard SF of standard can 6mixed gas manufacturing process is:
A, standard can is vacuumized to be shown as-0.1MPa of tensimeter when vacuum;
B, fill N 2gas to tensimeter shows 0MPa;
C, fill SF 6gas to tensimeter shows 0.3MPa;
D, standard can is connected with light source module.
Wherein, the SF in sample can in the present embodiment 6mixed gas is 75%SF 6gas and 25%N 2the mixed gas of gas composition; Pressure is relative pressure value, SF 6gas and N 2gas adopts the gas that purity is 99.99%;
2.: the sample can straight cutting of vacuum pumping is carried out to gas collecting to GIS pipeline, and after pressure reaches setting value, gas regulation port is closed automatically; Now pulling up tank body is connected it with light source module; In the present embodiment, tank interior gas pressure intensity is 0.3MPa, and moisture is less than 100ppm, SF 6gas and N 2gas adopts the gas that purity is 99.99%.
3.: due to SF 6gas and N 2, even if there is the balance exercise between molecule but the gas density of pipeline upper wall is necessarily less than the gas density of pipeline lower wall, so choosing of the gas production point of GIS also exists error in the density difference of gas; According to the design of actual GIS pipeline pore, be typically chosen in slightly below, pipeline middle part, also can carry out gas sampling at GIS pipeline diverse location, degree of uniformity that can analysis conduit internal gas.
(2): build SF 6gas data storehouse; As shown in Figure 2 at known test environment temperature, standard can internal standard SF 6sF to be measured in mixed gas composition and sample can 6in the situation of mixed gas composition;
A: infrared light optical splitter after filter plate filtering is transmitted into infrared light in two tank bodies equably, infrared light through standard can shows a voltage signal on photodetector, this signal is the benchmark zero point of magnitude of voltage, on photodetector, show a voltage signal through the infrared light of sample can, this signal is tested magnitude of voltage simultaneously; Calculate the voltage difference of described benchmark zero point and tested magnitude of voltage by PC, and build the constant temperature-concentration-voltage curve at this temperature according to SF6 gas concentration in SF6 mixed gas to be measured corresponding to voltage difference and this voltage difference;
In the present embodiment, the manufacturing process of establishing criteria tank is made SF 6gas concentration is respectively 60%～80% sample can;
The in the situation that of temperature constant, obtain respectively SF to be measured by photodetector 6sF in mixed gas 6magnitude of voltage when gas concentration is 60%～80%, builds constant temperature-concentration-voltage curve; Each SF that adjusts 6gas concentration be spaced apart 0.1%, test point is 200;
As the SF in sample can 6the magnitude of voltage that the concentration of gas obtains lower than 75% time is being for just, SF 6the magnitude of voltage that the concentration of gas obtains higher than 75% time is for negative;
B: change and measure temperature value, obtain all constant temperature-concentration-voltage curves under identical pressure different temperatures; In the present embodiment, temperature increases progressively with the interval of 1 DEG C within the scope of-20 DEG C～50 DEG C.
(3): the infrared light of light source module transmitting is through SF to be measured 6after mixed gas, through-put power changes, and the concentration-voltage curve obtaining is compared to the anti-SF that releases in the voltage difference of the magnitude of voltage of photodetector output and step (2) 6sF in mixed gas 6the concentration of gas, as shown in Figure 3;
SF provided by the invention 6concentration off-line detection device, the concentration that is equally applicable to wherein a kind of gas of other kinds mixed gas detects.
Finally should be noted that: described embodiment is only some embodiments of the present application, instead of whole embodiment.Based on the embodiment in the application, those of ordinary skill in the art are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the application's protection.

Claims (8)

1. SF in a GIS pipeline 6concentration off-line detection device, is characterized in that, described device comprises the light source module and the signal analyse block that are connected with gas tank module respectively;
Described gas tank module comprises standard can and sample can, is respectively used to storage standards SF 6mixed gas and SF to be measured 6mixed gas;
Described light source module, for launching infrared light to described gas tank module;
Described signal analyse block, for the described infrared signal of foundation and SF 6gas data storehouse, to SF to be measured in sample can 6the concentration of mixed gas is analyzed.
2. SF in a kind of GIS pipeline as claimed in claim 1 6concentration off-line detection device, is characterized in that, described standard can and sample can include a gas regulation port and two fiber ports;
When described gas regulation port is connected with the inflatable interface of GIS pipeline, for gathering standard SF 6mixed gas and SF to be measured 6mixed gas; Pressure control device detects the atmospheric pressure value in tank body in real time, and when described atmospheric pressure value exceedes after setting value, described pressure control device cuts out described gas regulation port and sends warning message.
3. SF in a kind of GIS pipeline as claimed in claim 2 6concentration off-line detection device, is characterized in that, described pressure control device comprises single-chip microcomputer and pressure transducer; The tank interior force value that described single-chip microcomputer gathers according to pressure transducer is adjusted the open and-shut mode of gas admittance valve and air outlet valve.
4. SF in a kind of GIS pipeline as claimed in claim 1 6concentration off-line detection device, is characterized in that, described light source module comprises infrared light supply, filter plate and optical splitter;
Described filter plate carries out filtering for the infrared light that is 1～20 μ m to the wavelength of infrared light supply transmitting; Described optical splitter is divided into two bundle infrared lights by filtered infrared light according to the ratio of 1:1, is transmitted into respectively standard can and sample can.
5. SF in a kind of GIS pipeline as claimed in claim 1 6concentration off-line detection device, is characterized in that, described signal analyse block comprises photodetector and PC; Described photodetector, is respectively used to measure the power signal of the infrared light after the transmission of standard can and sample can, and described power signal is converted to voltage signal sends in described PC.
6. SF in a kind of GIS pipeline as claimed in claim 5 6concentration off-line detection device, is characterized in that, described PC comprises data acquisition unit, data analysis unit and SF 6gas data storehouse;
Described data analysis unit will be carried out difference computing with the magnitude of voltage of standard can and the tank connected photodetector output of sampling respectively, and by operation result and described SF 6concentration-voltage curve in gas data storehouse compares, thereby obtains SF in sample can 6sF in mixed gas 6the concentration of gas.
7. SF in a kind of GIS pipeline as claimed in claim 6 6concentration off-line detection device, is characterized in that, the construction method of described concentration-voltage curve comprises:
Step 1: when temperature constant, obtain SF to be measured 6sF in mixed gas 6the difference of the magnitude of voltage of photodetector output described in when gas concentration is followed successively by 60%～80%, thus build constant temperature-concentration-voltage curve;
Step 2: be that all constant temperature-concentration-voltage curves in-20 DEG C～50 DEG C build described concentration-voltage curve according to temperature range.
8. SF in a kind of GIS pipeline as claimed in claim 7 6concentration off-line detection device, is characterized in that, SF described in described step 1 6gas concentration increases progressively with 0.1% interval; The benchmark that calculates described difference is and the magnitude of voltage of the tank connected photodetector output of standard zero point;
In described step 2 with all described constant temperature-concentration-voltage curves within the scope of interval acquiring-20 of 1 DEG C DEG C～50 DEG C.
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CN104198425A (en) * 2014-09-22 2014-12-10 合肥工业大学 Temperature and air pressure characteristic test system for non-dispersive infrared gas sensor
CN104535519A (en) * 2014-12-12 2015-04-22 东北石油大学 Online detection device for concentration of polyacrylamide in oilfield wastewater
CN106841088A (en) * 2017-01-17 2017-06-13 西安景辉信息科技有限公司 A kind of oilseed moisture analyzer sensor and its implementation
CN107796784A (en) * 2017-09-04 2018-03-13 国网山东省电力公司电力科学研究院 SF6 Insulating A High-Voltages electrical equipment gas componant on-Line Monitor Device and monitoring method
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CN109709059A (en) * 2019-01-17 2019-05-03 上海化工研究院有限公司 A kind of long light path pulsed infrared laser light absorption type gas sampling monitoring device

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104198427A (en) * 2014-09-09 2014-12-10 中国科学院电工研究所 Photo-acoustic spectrometry detection device utilizing radial structure
CN104198425A (en) * 2014-09-22 2014-12-10 合肥工业大学 Temperature and air pressure characteristic test system for non-dispersive infrared gas sensor
CN104535519A (en) * 2014-12-12 2015-04-22 东北石油大学 Online detection device for concentration of polyacrylamide in oilfield wastewater
CN108645969A (en) * 2016-05-18 2018-10-12 漳州龙文区炼盛合信息技术有限公司 A kind of SF6 gases on-line monitoring system
CN106841088A (en) * 2017-01-17 2017-06-13 西安景辉信息科技有限公司 A kind of oilseed moisture analyzer sensor and its implementation
CN107796784A (en) * 2017-09-04 2018-03-13 国网山东省电力公司电力科学研究院 SF6 Insulating A High-Voltages electrical equipment gas componant on-Line Monitor Device and monitoring method
CN109709059A (en) * 2019-01-17 2019-05-03 上海化工研究院有限公司 A kind of long light path pulsed infrared laser light absorption type gas sampling monitoring device
CN109709059B (en) * 2019-01-17 2021-12-21 上海化工研究院有限公司 Long optical path pulse infrared laser absorption type gas sampling monitoring device

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