CN202814929U - Tank body health monitoring device of gas insulated switchgear (GIS) - Google Patents
Tank body health monitoring device of gas insulated switchgear (GIS) Download PDFInfo
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- CN202814929U CN202814929U CN 201220531072 CN201220531072U CN202814929U CN 202814929 U CN202814929 U CN 202814929U CN 201220531072 CN201220531072 CN 201220531072 CN 201220531072 U CN201220531072 U CN 201220531072U CN 202814929 U CN202814929 U CN 202814929U
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- 230000036541 health Effects 0.000 title claims abstract description 30
- 238000012806 monitoring device Methods 0.000 title claims abstract description 22
- 238000003384 imaging method Methods 0.000 claims description 2
- 238000001514 detection method Methods 0.000 abstract description 26
- 230000006378 damage Effects 0.000 abstract description 16
- 238000012544 monitoring process Methods 0.000 abstract description 12
- 230000007547 defect Effects 0.000 abstract description 4
- 239000006185 dispersion Substances 0.000 description 14
- 230000002950 deficient Effects 0.000 description 11
- 238000000034 method Methods 0.000 description 7
- 239000000523 sample Substances 0.000 description 7
- 238000002604 ultrasonography Methods 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 4
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- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 206010061619 Deformity Diseases 0.000 description 1
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
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- 230000003862 health status Effects 0.000 description 1
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- 238000005259 measurement Methods 0.000 description 1
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- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The utility model discloses an ultrasonic guided-wave based tank body health monitoring device of a GIS. Current detection methods are greatly affected by positions, directions and types of defects and can not effectively solve the health monitoring problems of the GIS. The tank body health monitoring device comprises an ultrasonic detector, a coder, a scanning rack and an ultrasonic guided-wave transducer. The tank body health monitoring device is characterized in that the ultrasonic guided-wave transducer and the coder are connected with the scanning rack to enable the ultrasonic guided-wave transducer and the coder to operate synchronously, the coder is connected with the ultrasonic detector through a data line, the ultrasonic guided-wave transducer comprises a casing, a wedge and a wafer, the wedge is arranged inside the casing, the wafer is placed on the wedge, and the ultrasonic guided-wave transducer is connected with the ultrasonic detector through a bayonet nut connector (BNC ). According to the tank body health monitoring device, the ultrasonic guided-wave transducer can produce ultrasonic guided-waves of the high signal-to-noise ratio and the high transmitting capacity, and damage of the whole GIS tank body can be detected through limited scanning.
Description
Technical field
The utility model relates to electric power complete equipment field of non destructive testing, specifically a kind of gas-insulating and fully-enclosed combined electrical apparatus tank body health monitoring device based on supersonic guide-wave.
Background technology
Gas-insulating and fully-enclosed combined electrical apparatus (hereinafter to be referred as GIS) is the complete equipment that combined by multiple High-Voltage Electrical Appliances such as isolating switch, disconnector, grounding switch, buses, these equipment or parts all are enclosed in metal can inside, and the SF6 gas that is filled with certain pressure (generally greater than 0.3MPa) is as insulation and arc-extinguishing medium.Wherein the tank body of GIS use is pressure-containing member, requires the SF6 leak rate less than 1%.In case leak owing to the damage of GIS tank body produces SF6, not only affect the reliability service of GIS and even electric system, also can pollute surrounding environment simultaneously, harm staff's healthy and life security.Therefore, GIS tank body health status is monitored have important Social benefit and economic benefit.
The GIS tank body has monoblock cast and two kinds of forms of roll bending welding.Physical dimension is generally: barrel diameter 400-1000mm, thickness of shell 6-10mm, long 1000-3000mm, material is generally aluminium alloy 5A02-H112.In the production run, easily produce pore, shrinkage cavity and cold shut, slag inclusion, defects i.e.cracks for cast housing; For welded case, the weld defects such as except the mother metal defective, that weld seam also can produce is lack of penetration, pore and crackle.GIS owing to reasons such as stress and vibrations, makes tank body crack equivalent damage during one's term of military service easily.Therefore should be in time regular carries out health monitoring to the GIS tank body, in time gets rid of hidden danger, guarantees the Systems balanth operation.
For the GIS tank body, the present domestic three kinds of detection methods that mainly contain: ray detection, Conventional Ultrasound detect and infiltration detects.JB/T4734-2002 " aluminum pressure vessel " regulation is tackled its category-A or the category-B welding joint carries out local ray detection or Ultrasonic Detection, and detecting length must not be less than each bar welding joint length 20%, and is not less than 250mm.Liu Ze flood works " Cubicle Gas-Insulated Switchgear (GIS) quality management and control " is mentioned, and the position that the casting tank body is produced especially easily defective should adopt ray to detect; For the longitudinal joint of each tank body, all should carry out the check of x-ray detection, and file.More than three kinds of shortcomings that method mainly exists: at first, these three kinds of detection methods all are point by point scanning, that is to say and to carry out Damage Evaluation to zone or the weld seam of sampling observation, if need to carry out health detection to whole tank body, just need to the full volumetric of whole tank body be scanned, above-mentioned three kinds of methods almost are irrealizable.Secondly, it is very large that these three kinds of detection methods are affected by position, direction and the type of defective, and for example, infiltration detects can only detect surface imperfection, specific ultrasonic probe can only detect surface imperfection or inherent vice, and ray detection area-type defect detection rate is subjected to the various factors such as transillumination angle.In addition, for the GIS tank body of being on active service, because electric equipment has been filled in inside, can't carry out ray detection and infiltration detection.Obviously, existing detection method method all can not effectively solve the health monitoring problem of GIS.
Summary of the invention
Technical problem to be solved in the utility model is to overcome the defective that above-mentioned detection method exists, a kind of gas-insulating and fully-enclosed combined electrical apparatus tank body health monitoring device based on ultrasonic guided wave detecting method is provided, it can realize the health of fully closed combined electric unit tank body is carried out actual monitoring, can carry out economy, quick and effectively detection to the damage of any wall thickness direction of whole GIS tank body.
For this reason, the technical solution adopted in the utility model is as follows: gas-insulating and fully-enclosed combined electrical apparatus tank body health monitoring device, comprise supersonic reflectoscope, scrambler, scanning frame and ultrasonic guided wave transducer, it is characterized in that, described ultrasonic guided wave transducer and scrambler all are connected with scanning frame, make ultrasonic guided wave transducer and scrambler synchronous operation, described scrambler is connected with supersonic reflectoscope by data line, described ultrasonic guided wave transducer comprises housing, place the voussoir and the wafer that is shelved on the voussoir of housing, described ultrasonic guided wave transducer links to each other with supersonic reflectoscope by bnc interface.
Ultrasonic guided wave transducer (be called for short probe) can produce high property make an uproar ratio, the supersonic guide-wave of transmittability by force, can pass through limited scanning and detect the damage of whole GIS tank body.
The ultimate principle of this monitoring device is: scanning frame is in the scanning of GIS tank surface, the position of scrambler record ultrasonic guided wave transducer, the guided wave of the GIS tank body damage information in probe emission and the test-accepting distance range, supersonic reflectoscope converts all scan-datas of ultrasonic guided wave transducer to the supersonic guide-wave image, thereby realizes the fast detecting of GIS tank body damage.
Further, described scanning frame is provided with at least one reference column, and the housing of ultrasonic guided wave transducer is provided with at least one pilot hole, and what the cooperation by pilot hole and reference column realized ultrasonic guided wave transducer and scanning frame is connected easy accessibility.
Further, described reference column and pilot hole respectively have two, all are to be symmetrical arranged, and make ultrasonic guided wave transducer more reliable and stable with being connected of scanning frame.
Further, described scrambler links to each other easy accessibility by the bearing pin of its front with the pin-and-hole of scanning frame rear side.
Further, described supersonic reflectoscope is for showing simultaneously the supersonic reflectoscope of two kinds of imagings.
Further, described scrambler is wheel type increment rotary encoder.
Further, the parameter of described wafer and voussoir is calculated by the tank body dispersion curve and is repeatedly tested and draws, and described wafer is preferably dimensioned to be 25 * 25mm, and calibration is 0.5-2MHz, and the angle of voussoir is preferably 35 ° to 60 °.
The monitoring method of utilizing above-mentioned monitoring device to carry out, its monitoring step is followed successively by: measure the tank body wall thickness; Draw the dispersion curve of tank body; Draw guided wave and excite angular curve figure; Make ultrasonic guided wave transducer; Draw the DAC curve; Carry out the hoop scanning; Carry out vertical scanning; Analysis of image data.
Described measurement tank body wall thickness refers to use supersonic reflectoscope that tank body is carried out wall thickness measuring.
The dispersion curve figure of described drafting tank body refers to draw monitored tank body guided wave speed-frequency curve, speed and the physical dimension of tank body and the relation between the guided wave frequency of this curve reflection supersonic guide-wave; Curve is according to the material of tank body and wall thickness, uses business software DISPERSE to draw.
Described drafting guided wave excites angular curve figure, and namely guided wave excites angle-frequency curve chart, is according to the tank body dispersion curve of drawing, and passes through formula by phase velocities dispersion curve
(
For exciting the angle,
Be velocity of longitudinal wave in the voussoir;
Be the guided wave speed that excites) change and get.
Described making ultrasonic guided wave transducer, refer to excite according to GIS tank body dispersion curve figure, guided wave the mode of vibration of angular curve figure, particle, test signal to noise ratio (S/N ratio), Dispersion and the transmittability of the supersonic guide-wave of more various mode, determine the parameter of frequency, size and the voussoir of ultrasonic guided wave transducer wafer.
Described drafting DAC curve, refer at wall thickness to be that GIS tank body (110KV, 220KV and part 500KVGIS are this specifications) the processing φ 2mm through hole of 8mm is as artificial reflecting body, change the forward position of ultrasonic guided wave transducer to the distance (from 300mm to 1800mm) of through hole, the drafting horizontal ordinate is transmission range, ordinate is the high curve of artificial reflected body wave, the anticipation of defective and shielding undesired signal when using this curve as scanning.
Described hoop scanning, refer to scanning frame with ultrasonic guided wave transducer, along tank body circumferencial direction (the guided wave direction of propagation and axially parallel) one week of Swivel scan, because the characteristic of guided wave, can monitor the damage on the whole wall thickness direction of whole cylindrical shell, and preserve the scanning image; This scanning mode is especially responsive to circumferential damage.
Described vertical scanning, refer to tank body from axially being divided into the monitoring section of two semicircles, use scanning frame to carry out respectively an opposite vertical scanning in the guided wave direction of propagation along tank body axial (the guided wave direction of propagation is with circumferentially parallel), monitor the damage on the whole wall thickness direction of whole cylindrical shell, and preserve the scanning image; This scanning mode is especially responsive to axial damage.
Described analysis of image data refers to an image data transmission to computing machine, and the software that the use ultrasound measuring instrument carries is judged position and the size of defective, thereby finished the health monitoring of GIS tank body data analysis.
The beneficial effect that the utlity model has:
1) for already present detection method, the utility model has improved detection efficiency greatly.Some place excitation supersonic guide-wave at tank body, because the characteristic of guided wave (very little along the travel path decay) itself, it can be propagated at whole length direction (during the hoop scanning) or the whole circumferencial direction (during vertical scanning) of tank body, so the signal that monitoring device receives has comprised the structural information of whole tank body.
2) the utility model has also improved the detection effect.With respect to already present detection method, owing to be subjected to position, the aspect effect of defective, usually be difficult to finish once monitoring to all kinds of damages with a kind of detection method, and this monitoring device is to motivate the guided wave sound field that spreads all over whole wall thickness at tank body, can detect inherent vice, can detect surface imperfection again, not be subjected to position, the aspect effect of defective, once monitor the detection of finishing various damages thereby reach.
Description of drawings
Fig. 1 is the structural representation of the utility model GIS tank body health monitoring device.
Fig. 2 is the utility model GIS tank body health monitoring step synoptic diagram.
Fig. 3 is that the utility model carries out hoop scanning synoptic diagram (A represents the guided wave transmit direction among the figure, and B represents the motion track of popping one's head in).
Fig. 4 is that the utility model carries out vertical scanning synoptic diagram (A represents the guided wave transmit direction among the figure, and B represents the motion track of popping one's head in).
Fig. 5 is the utility model GIS tank body dispersion curve.
Fig. 6 is that the utility model GIS tank body guided wave excites angular curve.
Fig. 7 is the utility model ultrasonic guided wave transducer scintigram.
Fig. 8 is the vertical scanning image of the utility model GIS tank body.
Embodiment
Below by specification drawings and specific embodiments the utility model is described in further detail, following examples be descriptive be not determinate, can not limit protection domain of the present utility model with this.
GIS tank body health monitoring device as shown in Figure 1, described scanning frame 1 is provided with two and is symmetrically arranged reference column 2, the housing of ultrasonic guided wave transducer is provided with two and is symmetrically arranged pilot hole 5, by the cooperation realization ultrasonic guided wave transducer 4 of pilot hole and reference column and being connected of scanning frame 1.Described scrambler 8 links to each other with the pin-and-hole 3 of scanning frame rear side by the bearing pin 9 of its front.Described scrambler 8 is connected with supersonic reflectoscope 10 by data line, described ultrasonic guided wave transducer 4 by housing, place the voussoir 7 of housing and the wafer 6 that is shelved on the voussoir forms, described ultrasonic guided wave transducer links to each other with supersonic reflectoscope 10 by bnc interface.The parameter of described wafer 6 and voussoir 7 is calculated by the tank body dispersion curve and is repeatedly tested and draws, and wafer 6 is of a size of 25 * 25mm, and frequency range is 0.5-2MHz; The angular range of voussoir 7 is 35 ° to 60 °.Described scrambler 8 is wheel type increment rotary encoder.
Monitored in the present embodiment to as if certain building site GIS tank body 11(of capital construction 220KV transformer station shown in Fig. 3,4), total length 2m, external diameter φ 774, wall thickness 8mm, material 5A02-H112.2 longitudinal joints 12 are arranged on this tank body, 3 interior peepholes 13 are arranged, the various electric equipments of tank interior install, and SF6 gas is substituted the bad for the good.As seen under the present situation, ray detection, infiltration detect and Conventional Ultrasound detects at most and can only carry out the part detection to tank body, can't monitor the health of whole tank body.
As shown in Figure 2, present embodiment is as follows to the step that the GIS tank body carries out health monitoring: measure the tank body wall thickness; Draw the dispersion curve of tank body; Draw guided wave and excite angular curve figure; Make the ultrasound waveguide wave transducer; Draw the DAC curve; Carry out the hoop scanning; Carry out vertical scanning; Analysis of image data.
1, measures the tank body wall thickness
Choose 4 points at the GIS tank body, use supersonic reflectoscope to test, the thickness measuring value of four points of record is got last mean value as the thickness of GIS tank body, and drawing this GIS tank body wall thickness is 8mm.
2, draw the dispersion curve of tank body
Use business software DISPERSE, draw the thick 5A02-H112 dispersion curve of 8mm, as shown in Figure 5, horizontal ordinate represents to excite the frequency of guided wave, and ordinate represents the speed of the guided wave modal that excites.
3, draw guided wave and excite angular curve figure
Draw guided wave and excite angular curve figure, as shown in Figure 6, this curve passes through formula by phase velocities dispersion curve
Convert, in disclosing
For exciting the angle,
Be velocity of longitudinal wave in the voussoir, voussoir is organic glass,
Get 2700m/s;
Be the guided wave speed that excites in the tank body of place.
4, make ultrasonic guided wave transducer
Excite angular curve figure and vibration displacement characteristic distributions according to dispersion curve, the guided wave drawn, signal to noise ratio (S/N ratio), transmittability and the disfigurement discovery ability of supersonic guide-wave on the GIS tank body of the various mode of experiment contrast, selecting and exciting the angle is 55 °, and stimulating frequency is the ultrasonic guided wave transducer of the S1 mode of 2MHZ.So the wafer 6 of selected 2MHZ, and the incident angle that voussoir 7 is set is 55 ° and makes ultrasonic guided wave transducers.Shown in Figure 7 is 1 meter waveform that obtains of the artificial reflecting body of probe distance (φ 2 mm through holes).As we know from the figure, the time of ultrasonic transmission is 670us, calculates speed
, the group velocity 2.999mm/us relative error 0.4% of S1 mode is very identical during with theoretical 2MHz.In addition as we know from the figure, when defective wave amplitude during in 40% left and right sides, the noise echo has very high signal to noise ratio (S/N ratio) about 10%.The ultrasonic guided wave transducer that shows manufacturing can produce the guided wave that mode is single, energy is large, can well be applied in the Practical Project detection.
5, draw the DAC curve
In the GIS tank body processing φ 2 as a comparison test blocks of mm through hole long 2 meters, that specification is φ 557 * 8mm, change Front distance to the distance (from 300mm to 1800mm) of through hole, the transmission range of drawing horizontal ordinate and being, ordinate be artificial reflected body wave high curve (as shown in Figure 7).In reality detects, take the DAC curve as Scanning sensitivity, can carry out anticipation to flaw size, and the shielding interference wave.
6, hoop scanning
The scanning frame 1 of dress scrambler 8 along GIS tank body circumferencial direction (Front distance is facing to length direction, and Probe arrangement as shown in Figure 3) one week of Swivel scan, obtains the scanning image with ultrasonic guided wave transducer 4.
7, vertically scanning
From length direction dimidiation circle, use tank body scanning equipment to carry out along its length vertical scanning (Probe arrangement as shown in Figure 4) of 2 straight lines, detect the damage on the whole wall thickness direction of whole cylindrical shell, and preserve scanning image (see figure 8).
8, graphical analysis
To computing machine, the software that the use ultrasound measuring instrument carries is to data analysis image data transmission.Fig. 8 horizontal ordinate represents probe from scanning starting point distance, and ordinate represents reflected signal from Front distance distance (being the hoop position), the size of the variation representation signal wave amplitude of color in the image, and red expression signal wave amplitude is the strongest.Among Fig. 8, are interior peepholes 13 apart from starting point 200mm and 1600 places; 3 defectives, these 3 defectives are positioned on the weld seam 12 apart from Front distance 700mm at the region memory of distance starting point 800 to 1200.
As seen the utility model " GIS tank body health monitor method " has only just obtained embodying the ultrasound data image of GIS tank body holistic health by a scanning, from image, can tell clearly architecture signals demonstration and flaw indication and show, greatly improve detection efficiency and detected effect.Therefore the method can rapidly and efficiently be carried out health monitoring to the GIS tank body, can well be used in engineering reality.
The above only is preferred embodiment of the present utility model, is not structure of the present utility model is done any pro forma restriction.Every foundation technical spirit of the present utility model all falls in the protection domain of the present utility model any simple modification, equivalent variations and modification that above embodiment does.
Claims (7)
1. gas-insulating and fully-enclosed combined electrical apparatus tank body health monitoring device, comprise supersonic reflectoscope (10), scrambler (8), scanning frame (1) and ultrasonic guided wave transducer (4), it is characterized in that, described ultrasonic guided wave transducer (4) is connected 8 with scrambler) all be connected with scanning frame (1), described scrambler (8) is connected with supersonic reflectoscope (10) by data line, described ultrasonic guided wave transducer (4) comprises housing, place the voussoir (7) of housing and be shelved on wafer (6) on the voussoir, described ultrasonic guided wave transducer links to each other with supersonic reflectoscope (10) by bnc interface.
2. gas-insulating and fully-enclosed combined electrical apparatus tank body health monitoring device according to claim 1, it is characterized in that, described scanning frame (1) is provided with at least one reference column (2), the housing of ultrasonic guided wave transducer is provided with at least one pilot hole (5), by the cooperation realization ultrasonic guided wave transducer (4) of pilot hole and reference column and being connected of scanning frame (1).
3. gas-insulating and fully-enclosed combined electrical apparatus tank body health monitoring device according to claim 2 is characterized in that described reference column and pilot hole respectively have two, all is to be symmetrical arranged.
4. gas-insulating and fully-enclosed combined electrical apparatus tank body health monitoring device according to claim 1 is characterized in that, described scrambler (8) links to each other with the pin-and-hole (3) of scanning frame rear side by the bearing pin (9) of its front.
5. gas-insulating and fully-enclosed combined electrical apparatus tank body health monitoring device according to claim 1 is characterized in that, described supersonic reflectoscope (10) is for showing simultaneously the supersonic reflectoscope of two kinds of imagings.
6. gas-insulating and fully-enclosed combined electrical apparatus tank body health monitoring device according to claim 1 is characterized in that, described scrambler (8) is wheel type increment rotary encoder.
7. gas-insulating and fully-enclosed combined electrical apparatus tank body health monitoring device according to claim 1 is characterized in that described wafer (6) is of a size of 25 * 25mm, and frequency is 0.5-2MHz, and the angle of voussoir (7) is 35 ° to 60 °.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220531072 CN202814929U (en) | 2012-10-17 | 2012-10-17 | Tank body health monitoring device of gas insulated switchgear (GIS) |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220531072 CN202814929U (en) | 2012-10-17 | 2012-10-17 | Tank body health monitoring device of gas insulated switchgear (GIS) |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102928507A (en) * | 2012-10-17 | 2013-02-13 | 浙江省电力公司电力科学研究院 | Health monitoring device and method of GIS (gas insulated switchgears) tank |
| CN110658261A (en) * | 2019-10-10 | 2020-01-07 | 天津科技大学 | Structural health monitoring frequency selection method based on ultrasonic guided waves |
-
2012
- 2012-10-17 CN CN 201220531072 patent/CN202814929U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102928507A (en) * | 2012-10-17 | 2013-02-13 | 浙江省电力公司电力科学研究院 | Health monitoring device and method of GIS (gas insulated switchgears) tank |
| CN102928507B (en) * | 2012-10-17 | 2014-12-10 | 浙江省电力公司电力科学研究院 | Health monitoring device and method of GIS (gas insulated switchgears) tank |
| CN110658261A (en) * | 2019-10-10 | 2020-01-07 | 天津科技大学 | Structural health monitoring frequency selection method based on ultrasonic guided waves |
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