CN101504325B - Visual template comparison method for detecting SF6 leakage rate by laser - Google Patents
Visual template comparison method for detecting SF6 leakage rate by laser Download PDFInfo
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Abstract
The invention provides a visible template reference contrast method for detecting leakage velocity of SF6 by laser, which belongs to the method for detecting SF6 gas leakage by equipment for power engineering. The method is to carry out video image shooting on distribution of leaked gas mist through an SF6 gas leakage laser tester, and determine the leakage velocity of the SF6 gas of the detectedequipment according to reference contrast of the video images of the detected equipment and a series of video images (visual templates) with different flow velocities. The method is simple, direct viewing and effective, can quantitatively measure the leakage amount and position gas leakage points, can reduce pollution of greenhouse effect gas on atmospheric environment, and guarantees safe operation of the equipment.
Description
Technical field
The present invention relates to power engineering and be filled with the water-tight equipment situation of SF6 gas with SF6 equipment or other, be filled with the SF6 gas apparatus owing to reasons such as poor sealings, produce leaking of SF6 gas, leak the laser testing instrument by SF6 gas, video image is carried out in the distribution of gas leakage cloud and mist to be taken, and, determine the leak rate of equipment under test SF6 gas according to the comparison of equipment under test video image and a series of different in flow rate video image (visual template).
Background technology
SF6 gas by " backscattering absorbs gas imaging technology (BAGI) " leaks the laser testing instrument, and under identical external condition, the SF6 gas of different leak rates presents the difference of cloud and mist distribution area and contrast at video image.And correlativity is arranged between the corresponding different leak rates of this difference, the SF6 gas cloud and mist distribution area that leak rate is big is wide, picture contrast big (the cloud and mist image is dark more).Cloud and mist distribution area and contrast by SF6 gas laser video image, comparison with the laser video image (visual template) of various known leak speed, obtain the leak rate of SF6 gas indirectly, can satisfy power engineering for understanding SF6 device interior gas-condition, to the demand of leak rate test.
Major technique has at present:
Adopt " backscattering absorbs gas imaging technology (BAGI) ", utilize the absorption characteristic of SF6 to the specific wavelength infrared spectrum, being used to locate leakage of SF6 gas or tracing gas cloud and mist is fundamental purpose laser remote detection technology.Can obtain the CONCENTRATION DISTRIBUTION of gas cloud and mist very intuitively by video image, but the quantizating index of leak rate and CONCENTRATION DISTRIBUTION state is not provided.
Based on the diffraction optics principle, it can be adjusted to any one spectral band to adopt " multispectral sensing technology (IMSS) ", gets final product imaging against sky and background at a distance.The IMSS video camera can not measures of quantization leakage rate and locating gas leakage point.
Adopt " schlieren imaging technology (SCHILEREN) " based at the refractive index height of the gas leakage between the grating under video camera and the lighting condition, cause to produce displacement when light reaches video camera, generate the schlieren image than surrounding air.Almost any gas leakage all can be also visual with the SCHILEREN technology for detection, and can estimate leakage rate.But owing to the background scans light source that must have, the equipment that surpasses some height still there is not spendable background scans light source facing to detection zone, thus can only be used for shorter and smaller equipment under test, and most of power engineering is higher with SF6 equipment.
Adopt quantitative leak detector to carry out measures of quantization to the gas concentration that collects, but the collection of gas leakage need be adopted button cover method, local bandaging strapping etc., and when carrying out leakage rate calculating, actual volume that equipment occupies in the cover or wrapping is irregular because of present situation, computed volume and the very large error of physical presence introduced are so the quantification of leakage rate of equipment is also very difficult.The quantitative leak detector of all models all can not carry out the charged detection of equipment simultaneously.
In the technique scheme, except that " backscattering absorbs gas imaging technology (BAGI) " successfully applies to the detection to charged SF6 equipment, other non-contacting optical testing technology is not seen the successful operation report of domestic power engineering Equipment Inspection.Quantitative leak detector belongs to the contact detection method, can not be used for the detection of charging equipment.
Adopt at present the BAGI technology that SF6 gas Leak Detection is used in actual live testing, but the leak rate that will determine equipment gas does not still have simply, intuitively, effective method.Do not leak the extent of injury that insulation causes to device interior owing to do not understand SF6 gas, can't administer and take the necessary precautionary measures pointedly.
Summary of the invention
The purpose of this invention is to provide and a kind ofly can be used for charging equipment, the visual template comparison method simple, directly perceived, that efficient laser detects the SF6 leak rate.
The object of the present invention is achieved like this: a kind of visual template comparison method of laser detection SF6 leak rate, carry out according to the following steps:
A), adopt SF6 gas to leak the laser testing instrument, make the different wind speed of a cover, different measuring distances, adopt normal flow equipment to produce the laser video image template of the different leak rates of a series of SF6 gases;
B), above-mentioned image series template is embedded SF6 gas leakage laser imaging check and analysis management software, as comparing with visual leak rate template;
C), adopt the SF6 that SF6 gas leaks laser testing instrument shooting equipment to leak video image;
D), from the b visual leak rate template in step, select template and c more than three to go on foot the SF6 leakage video image that obtains, compare with contrast by the gas cloud cloudy surface of image is long-pending, final definite immediate leak rate template, thereby the leak rate of definite equipment under test SF6 gas.
The a cover different wind speed of this method by making, (promptly at the different wind speed, under the different measuring distance conditions) of different measuring distances adopt normal flow equipment to produce the laser video image template of the different leak rates of a series of SF6 gases.This template embeds independent development " SF6 gas leaks laser imaging check and analysis management software ", determines the leak rate of SF6 equipment gas.Be adapted at using when the charged detection of power equipment SF6 equipment gas leaks.
Adopt the SF6 leak rate visual template of various " standards " of independent development, image with the reality test in " SF6 gas leaks laser imaging check and analysis management system " carries out the comparison of SF6 gas cloud and mist distribution area and contrast, quantize the SF6 equipment leakage speed of charging operation, thereby obtain the SF6 equipment leakage criticality or equipment year slip, instruct the maintenance work of SF6 equipment or the counter-measure of taking.
The good effect of this method invention is:
The present invention is based on the BAGI technology, can be used for charging equipment and measure, and method is simple, directly perceived, effective, can quantize to measure leakage rate and locating gas leakage point.
On capital of a country summit meeting in 1997, SF6 is that 6 kinds of conducts reduce one of greenhouse gases type of discharging, requires SF6 gas in 2012 to reduce and will account for 14% of greenhouse gas emissions.Abroad to various greenhouse gases to airborne release, and leak the concern of relevant financial cost problem with operational outfit, concentrated on and impelled in the detection and leak stopping of Utilities Electric Co. to the apparatus insulated gas of SF6.
China is along with the continuous increase of SF6 equipment, and the problem that gas leaks shows especially out, and the SF6 technique of laser imaging has changed the method for testing that must have a power failure in the past.Because it is button cover method, local bandaging strapping isometric(al) can't be known at all, fixed thereby so-called quantitative leak does not just have yet.Any method that can quantitatively check is not arranged so far as yet, so this method is to understanding the internal gas situation of SF6 equipment, will play good effect, help the current state of insulation of affirmation equipment, prediction development trend, change to repair based on condition of component system controlling sudden electric power accident and overhaul of the equipments system, the safe operation of electrical network all is significant.So, reduce the pollution of greenhouse gases to atmospheric environment no matter from " energy-saving and emission-reduction " protection environment, ensure that still power supply allows the common people live and work in peace and contentment, its social benefit all is huge.
Description of drawings
Fig. 1-1, Fig. 1-2, Fig. 1-the 3rd, the video interception of the visual leak rate template of the part of this method; Wherein, Fig. 1-1 is calm, and measuring distance 5m, leak rate are 11.11 μ L/s;
Fig. 1-2 is calm, and measuring distance 5m, leak rate are 13.89 μ L/s;
Fig. 1-3 is calm, and measuring distance 5m, leak rate are 55.55 μ L/s;
Fig. 2-the 1st, in nine li transformer stations of Leshan, Sichuan 220kV, the on-the-spot charged test video sectional drawing that SF6 equipment (GIS) is leaked, the external world is calm, measuring distance 5m;
Fig. 2-the 2nd, on-the-spot GIS equipment leakage position photo.GIS is the english abbreviation of " Cubicle Gas-Insulated Switchgear ", also claims combined electrical apparatus, and GIS is the higher and very important equipment for power transmission and distribution of price in the power engineering;
Fig. 3 is a visual leak rate template comparison process flow diagram in the analysis and management system.
Embodiment
A kind of visual template comparison method of laser detection SF6 leak rate, carry out according to the following steps:
A), employing SF6 gas leaks the laser testing instrument, the different wind speed of making one cover, different measuring distances, the laser video image template of the different leak rates of a series of SF6 gases of employing normal flow equipment (as volume pump) generation;
B), above-mentioned image series template is embedded SF6 gas leakage laser imaging check and analysis management software, as comparing with visual leak rate template;
C), adopt the SF6 that SF6 gas leaks laser testing instrument shooting equipment to leak video image;
D), from the b visual leak rate template in step, select template and c more than three to go on foot the SF6 leakage video image that obtains, compare with contrast by the gas cloud cloudy surface of image is long-pending, final definite immediate leak rate template, thereby the leak rate of definite equipment under test SF6 gas.
A is in the step, laser video image template video image is 1,2 or moderate breeze speed, measuring distance is respectively 3m, 5m, 8m, 15m, and the SF6 leak rate is by making under 1 μ L/s, 2 μ L/s, 3.05 μ L/s, 5.55 μ L/s, 8.33 μ L/s, 11.11 μ L/s, 13.89 μ L/s, 20.83 μ L/s, 27.77 μ L/s, 41.66 μ L/s or 55.55 μ L/s (microlitre/second) condition; After described d step is determined leak rate, can determine the SF6 slip of equipment under test by following formula: year leak rate (%)=19 * leakage flow (μ L/s)/air chamber charge-air mass (kg).
(refer to the accompanying drawing of all footnotes referring to Fig. 1 with 1 beginning, down together), in the video of visual leak rate template, also can observe small gas flow, but it is static that video interception is, trickle gas flow can't show, so have a mind to widen each leak rate ladder gap in the video interception, to show the difference of each leak rate.
Visual leak rate template video image adopts the standard flow rate device at different wind speed, different measuring distances, and the video image of the different leak rates of being taken by the laser testing instrument of SF6 gas is formed.This template embeds in " SF6 gas leaks laser imaging check and analysis management system ", and the video image that the scene is detected is analyzed and managed.
Visual leak rate template video image is 1,2 or moderate breeze speed, measuring distance is respectively under the environment of 3m, 5m, 8m, 15m and has all made series mask by 1 μ L/s, 2 μ L/s, 3.05 μ L/s, 5.55 μ L/s, 8.33 μ L/s, 11.11 μ L/s, 13.89 μ L/s, 20.83 μ L/s, 27.77 μ L/s, 41.66 μ L/s, 55.55 μ L/s (microlitre/second, i.e. 10-6 liter/second).
Referring to Fig. 2.Fig. 2-1 is the leakage video image of the SF6 equipment (GIS) of on-the-spot test shooting, and Fig. 2-2 is the field apparatus photo, and common camera can't be taken its SF6 gas leakage situation, and red point is the leak source that GIS is leaking SF6 gas in the photo.
Referring to Fig. 3.Visual leak rate template comparison process flow diagram in the analysis and management system, the leakage video image of equipment under test is written in " SF6 gas leaks laser imaging check and analysis management system " database, by the analysis management menu, enter " leak rate comparison " interface.According to the environmental baseline (as wind-force, distance) of test site, select corresponding visual leak rate template operation, can select the template more than three to compare simultaneously.Leak the long-pending and contrast of gas cloud cloudy surface that concentration produces by equipment under test SF6, finally determine corresponding leak rate template, thereby determine the leak rate of equipment under test SF6 gas.The SF6 gas weight (quality) that charges into by tested air chamber again calculates (year) slip of this leakage point.
Major function of this method and technical indicator:
Major function: by embedding the visual leak rate template of the various standards in " SF6 gas leaks laser imaging check and analysis management system " software, carry out the comparison of SF6 gas leakage cloud and mist distribution area and contrast with the video image of reality test, obtain equipment under test gas leak rate, the substitution following formula can be determined the SF6 equipment gas year slip of tested charging operation.Year leak rate (%)=19 * leakage flow (μ L/s)/air chamber charge-air mass (kg)
Technical indicator: wind speed range: 0～3 grade; Measuring distance: 0～15m; Template gray scale: 256 grades; Minimum leakage speed: 1 μ L/s; Maximum leakage speed: 55.55 μ L/s.
The instrument title: SF6 gas leaks laser imager (Zhejiang Hongxiang Technology Co., Ltd.), instrument model: HX-1.
Technical device parameter: leak detection scope: 0-15m; Field angle: 9 ° * vertical 6 ° of levels; Focusing range: 0～50m; Detection sensitivity: 1 * 10-3scc/sec; Optical resolution: 256 grades of gray scales,, 1 milliradian; Video image: in real time, 262 frequency/lines, 440 lines/frame; Power requirement: 220VAC, 50Hz.
Claims (3)
1. the visual template comparison method of a laser detection SF6 leak rate is characterized in that: carry out according to the following steps:
A), adopt SF6 gas to leak the laser testing instrument, make the different wind speed of a cover, different measuring distances, adopt normal flow equipment to produce the laser video image template of the different leak rates of a series of SF6 gases;
B), above-mentioned image series template is embedded SF6 gas leakage laser imaging check and analysis management software, as comparing with visual leak rate template;
C), adopt the SF6 that SF6 gas leaks laser testing instrument shooting equipment to leak video image;
D), from the b visual leak rate template in step, select template and c more than three to go on foot the SF6 leakage video image that obtains, compare with contrast by the gas cloud cloudy surface of image is long-pending, final definite immediate leak rate template, thereby the leak rate of definite equipment under test SF6 gas.
2. according to the visual template comparison method of the described laser detection SF6 leak rate of claim 1, it is characterized in that: described a is in the step, laser video image template video image is 1,2 or moderate breeze speed, measuring distance is respectively 3m, 5m, 8m, 15m, and the SF6 leak rate is by making under 1 μ L/s, 2 μ L/s, 3.05 μ L/s, 5.55 μ L/s, 8.33 μ L/s, 11.11 μ L/s, 13.89 μ L/s, 20.83 μ L/s, 27.77 μ L/s, 41.66 μ L/s or 55.55 μ L/s (microlitre/second) condition; After described d step is determined leak rate, can determine the SF6 slip of equipment under test by following formula: year leak rate (%)=19 * leakage flow (μ L/s)/air chamber charge-air mass (kg).
3. according to the visual template comparison method of claim 1 or the described laser detection SF6 leak rate of 2 arbitrary claims, it is characterized in that: described normal flow equipment is volume pump.
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