CN114894901A - In-service basin-type insulator defect phased array detection and operation life evaluation method - Google Patents
In-service basin-type insulator defect phased array detection and operation life evaluation method Download PDFInfo
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- CN114894901A CN114894901A CN202210509230.5A CN202210509230A CN114894901A CN 114894901 A CN114894901 A CN 114894901A CN 202210509230 A CN202210509230 A CN 202210509230A CN 114894901 A CN114894901 A CN 114894901A
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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
- G01N29/04—Analysing solids
- G01N29/06—Visualisation of the interior, e.g. acoustic microscopy
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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
- G01N29/04—Analysing solids
- G01N29/06—Visualisation of the interior, e.g. acoustic microscopy
- G01N29/0654—Imaging
- G01N29/069—Defect imaging, localisation and sizing using, e.g. time of flight diffraction [TOFD], synthetic aperture focusing technique [SAFT], Amplituden-Laufzeit-Ortskurven [ALOK] technique
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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
- G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
- G01N29/4472—Mathematical theories or simulation
Abstract
The invention relates to an in-service basin-type insulator defect phased array detection and operation life evaluation method, which comprises the following steps: acquiring basic information parameters of a basin-type insulator to be detected; secondly, an ultrasonic phased array detector is adopted to establish a basin-type insulator ultrasonic phased array detection platform; thirdly, setting and adjusting detection parameters according to basic information of the basin-type insulator to be detected; fourthly, two sides of the bolt hole of the basin-type insulator to be detected are continuously detected from top to bottom in the thickness direction to form an image; judging whether cracking defects exist near the bolt holes of the basin insulator to be detected according to the signal color and the distribution area in the image; if the crack defect exists, simulating and calculating a crack stress intensity factor K1 by using simulation software; and then extracting a crack stress intensity factor K1, calculating the defect fatigue crack propagation life by utilizing a fracture mechanics Pairs formula, and evaluating the service life of the basin-type insulator to be detected. The invention can carry out live detection when the GIS combined electrical apparatus works, and has the advantages of convenience, practicability and high efficiency.
Description
Technical Field
The invention relates to the technical field of nondestructive testing, in particular to an in-service basin-type insulator defect phased array testing and operation life evaluation method.
Background
The basin insulator is an important part of the GIS combined electrical apparatus, and the quality condition of the basin insulator has important influence on the safe and stable operation of a power grid. The basin-type insulator is connected with the GIS barrel through the bolts, stress concentration easily occurs in the area near the bolt holes, particularly when the bolt pretightening force difference is obvious, the stress concentration is uneven near different bolt holes, the stress concentration area is easy to crack and expand, and then gas leakage of a GIS gas chamber and serious accidents of a power grid are caused.
At present, the basin-type insulator mainly uses X-ray and acoustic emission detection. However, the X-ray detection method is limited by the conditions of the field installation area, and the defect detection rate is difficult to meet the actual requirements. In addition, the ray detection has high labor intensity and low efficiency, and is easy to cause radiation damage to human bodies. On the premise of capturing defect extension signals, the acoustic emission technology is difficult to capture signals generated by steady-state defects, or difficult to accurately judge the captured steady-state signals, which is easy to cause missed detection and false detection.
Disclosure of Invention
The invention aims to provide an efficient and accurate in-service basin-type insulator defect phased array detection and operation life assessment method.
In order to solve the problems, the in-service basin-type insulator defect phased array detection and operation life evaluation method comprises the following steps:
acquiring basic information parameters of a basin-type insulator to be detected;
secondly, an ultrasonic phased array detector is adopted to establish a basin-type insulator ultrasonic phased array detection platform;
thirdly, setting and adjusting detection parameters according to basic information of the basin-type insulator to be detected;
fourthly, two sides of the bolt hole of the basin-type insulator to be detected are continuously detected from top to bottom in the thickness direction to form an image;
judging whether cracking defects exist near the bolt holes of the basin insulator to be detected according to the signal color and the distribution area in the image; if the crack defects exist, simulating and calculating a crack stress intensity factor K1 by using simulation software according to the size and distribution characteristics of the crack defects; and then extracting a crack stress intensity factor K1, calculating the defect fatigue crack propagation life by utilizing a fracture mechanics Pairs formula, and evaluating the service life of the basin-type insulator to be detected.
The method comprises the steps of firstly detecting basin-type insulator basic information parameters including outer diameters, sealing ring groove widths, depths of two sides of sealing ring grooves and distances from outer sides of sealing rings to the outer diameters.
The ultrasonic phased array detector comprises a probe, a wafer, a power supply and a power supply, wherein the probe of the ultrasonic phased array detector is a self-focusing phased array probe, the frequency is 2.25MHz, the number of wafers is 16, the wafer interval is 0.5mm, and the wafer length is 10 mm.
The detection parameters in the step three are set and adjusted according to the following method:
inputting the distance from the outer side of a sealing ring of a basin-type insulator to be detected to the outer diameter, namely the thickness of a workpiece; meanwhile, adjusting the corresponding focusing depth to be consistent with the distance from the outer side of the sealing ring of the basin-type insulator to be detected to the outer diameter;
secondly, placing a probe at any side of a bolt hole of the basin-type insulator to be detected, and performing actual sound velocity calibration by using the depth of two sides of a sealing ring groove of the basin-type insulator to be detected in a phased array transverse wave detection mode;
thirdly, adjusting the excitation times, the reflection times, the sound path display range and the gain dB value of the ultrasonic phased array detector, and adjusting the emission echoes of the depth grooves on the two sides of the seal ring groove to 80% of a full screen;
adjusting the scanning angle of the sector of the ultrasonic phased array detector, and setting the scanning angle to be within the range of the highest end angle reflectivity, namely 35-55 degrees.
The cracking defect in the step fife is judged according to the following method: when the area color is displayed in dark color within the range of the focusing depth, the cracking defect exists near the bolt hole; when only a single bottom reflection or no reflection area in the focusing range is displayed in dark color, no crack defect exists.
Compared with the prior art, the invention has the following advantages:
1. according to the ultrasonic phased array detection method and device, the basin-type insulator ultrasonic phased array detection platform is adopted, and the detection parameters of the ultrasonic phased array detector are set and adjusted according to the basin-type insulator basic information, so that an ultrasonic phased array detection image is formed, and whether defects exist near the bolt hole of the basin-type insulator to be detected or not can be accurately judged.
2. According to the invention, the crack stress intensity factor K1 can be extracted by using simulation software according to the size of the crack defect, and the operation life is evaluated, so that the operation state and the service life of the equipment can be diagnosed and known in time, the equipment can be detected and judged regularly, the small defect of the equipment can be found in time, the occurrence of a power grid accident is avoided, and the stable operation of the power equipment is ensured.
3. The invention can carry out live detection when the GIS combined electrical apparatus works, and has the advantages of convenience, practicability and high efficiency.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
FIG. 1 is a diagram of a basin-type insulator in an embodiment of the invention. Wherein: the left figure is the front and the right figure is the back.
Fig. 2 is a front ultrasonic view of a basin insulator in an embodiment of the present invention.
Detailed Description
An in-service basin-type insulator defect phased array detection and operation life assessment method comprises the following steps:
the method includes the steps of obtaining basic information parameters of the basin-type insulator to be detected. The basic information parameters of the basin-type insulator comprise the outer diameter, the width of the sealing ring groove, the depth of two sides of the sealing ring groove and the distance from the outer side of the sealing ring to the outer diameter.
An ultrasonic phased array detector is adopted to establish a basin-type insulator ultrasonic phased array detection platform. The probe of the ultrasonic phased array detector is a self-focusing phased array probe, the frequency is 2.25MHz, the number of wafers is 16, the spacing between the wafers is 0.5mm, and the length of the wafers is 10 mm.
And thirdly, setting and adjusting detection parameters according to the basic information of the basin-type insulator to be detected. The specific process is as follows:
inputting the distance from the outer side of a sealing ring of a basin-type insulator to be detected to the outer diameter, namely the thickness of a workpiece; meanwhile, adjusting the corresponding focusing depth to be consistent with the distance from the outer side of the sealing ring of the basin-type insulator to be detected to the outer diameter;
secondly, placing a probe at any side of a bolt hole of the basin-type insulator to be detected, and performing actual sound velocity calibration by using the depth of two sides of a sealing ring groove of the basin-type insulator to be detected in a phased array transverse wave detection mode;
thirdly, adjusting the excitation times, the reflection times, the sound path display range and the gain dB value of the ultrasonic phased array detector, and adjusting the emission echoes of the depth grooves on the two sides of the seal ring groove to 80% of a full screen;
adjusting the scanning angle of the sector of the ultrasonic phased array detector, and setting the scanning angle to be within the range of the highest end angle reflectivity, namely 35-55 degrees.
Both sides of the bolt hole of the basin-type insulator to be detected are continuously detected from top to bottom in the thickness direction to form an image.
And fifthly, judging whether cracking defects exist near the bolt holes of the basin insulator to be detected according to the signal color and the distribution area in the image. The cracking defect was judged as follows: when the area color is displayed in dark color within the range of the focusing depth, the cracking defect exists near the bolt hole; when only a single bottom reflection or no reflection area in the focusing range is displayed in dark color, no crack defect exists.
If the defects exist, simulating and calculating a crack stress intensity factor K1 by using simulation software according to the size and distribution characteristics of the crack defects; and then extracting a crack stress intensity factor K1, calculating the defect fatigue crack propagation life by using a fracture mechanics Pairs formula, and evaluating the service life of the basin-type insulator to be detected.
In the formula:acrack depth or width;Nthe number of stress cycles; delta K is the variation range of the stress intensity factor;a 0 an initial crack length;a c critical crack length;Fthe geometric correction factor can be found out by a stress intensity factor manual;
the cyclic stress amplitudes C and m are both material-related parameters;K c the fracture toughness of the material.
If K1 is more than delta K, the basin-type insulator is in danger of sudden breakage and needs to be replaced in time after power failure; if K1 is less than delta K, the basin-type insulator is not in danger of sudden fracture, and the practical service life of the basin-type insulator needs to be evaluated and calculated.
The embodiment takes a GIS combined electrical apparatus basin insulator in a 110kV transformer substation as an example, and is shown in figure 1.
An in-service basin-type insulator defect phased array detection and operation life assessment method comprises the following steps:
acquiring basic information parameters of a basin-type insulator to be detected: the outer diameter is 680mm, the width of the sealing ring groove is 10mm, the depths of two sides of the sealing ring groove are respectively 8mm, the thickness is 60mm, and the distance from the outer side of the sealing ring to the outer diameter is 50 mm.
An ultrasonic phased array detector is adopted to establish a basin-type insulator ultrasonic phased array detection platform. The probe of the ultrasonic phased array detector is a self-focusing phased array probe, the frequency is 2.25MHz, the number of wafers is 16, the spacing between the wafers is 0.5mm, and the length of the wafers is 10 mm.
Thirdly, the industrial paste which is good in sound transmission and viscous and not easy to flow is coated on the side face of the basin-type insulator, so that coupling of the probe and the workpiece is guaranteed, and energy loss when sound waves enter different interfaces is reduced.
And setting and adjusting detection parameters according to the basic information of the basin-type insulator to be detected. The specific process is as follows:
inputting the thickness of a workpiece of an ultrasonic phased array detector with the distance from the outer side of a sealing ring to the outer diameter of 50mm, and adjusting the corresponding focusing depth to be consistent with the distance from the outer side of the sealing ring of the input basin-type insulator to the outer diameter of 50 mm;
and secondly, performing actual sound velocity calibration by using the depths of two sides of a sealing ring groove of the basin-type insulator to be detected. Namely: the probe is placed on the side face of the basin-type insulator, the A in the ultrasonic phased array detector is used for aligning to any depth groove on two sides, the depth display range of the ultrasonic phased array detector is adjusted until the distance from the outer side of the sealing ring to the outer diameter of 50mm is consistent, and the sound velocity is the actual sound velocity of the basin-type insulator.
Adjusting the excitation and reflection times of the ultrasonic phased array detector to be 1.5, the sound path display range to be 100mm, and adjusting the emission echoes of the depth grooves on the two sides of the seal ring groove to 80% of a full screen;
adjusting the scanning angle of the sector of the ultrasonic phased array detector, and setting the scanning angle to be within the range of the highest end angle reflectivity, namely 35-55 degrees.
And four, continuously detecting two sides of the bolt hole of the basin-type insulator to be detected in a segmented mode from top to bottom in the thickness direction to form an image, wherein the image is shown in figure 2.
Fifthly, the dark area with the lower color is a defect and the defect is located between the initial wave and the low wave, and the phased array probe is placed on one side of the bolt hole, so that the cracking defect of the basin-type insulator near the bolt hole can be judged, and the defect size can be measured by measuring the area with the deeper color.
Performing analog calculation by utilizing COMSOL5.6 simulation software, and then obtaining a crack stress intensity factor K1=2.01 MPa-mm 1/2 。
F=1.12，a=a 0 =0.5mm，
=σ max- σ min =4.2MPa；K c =1.9MPa·mm 1/2
ΔK=K max -K min =1.12
=0.589MPa·mm 1/2
When m is not equal to 2, the ratio,
=2.78×10 9 and (5) performing secondary circulation.
Claims (5)
1. An in-service basin-type insulator defect phased array detection and operation life assessment method comprises the following steps:
the method includes the steps that basic information parameters of the basin-type insulator to be detected are obtained;
secondly, an ultrasonic phased array detector is adopted to establish a basin-type insulator ultrasonic phased array detection platform;
thirdly, setting and adjusting detection parameters according to basic information of the basin-type insulator to be detected;
fourthly, two sides of the bolt hole of the basin-type insulator to be detected are continuously detected from top to bottom in the thickness direction to form an image;
fifthly, judging whether cracking defects exist near the bolt holes of the basin insulator to be detected according to the signal color and the distribution area in the image; if the crack defects exist, simulating and calculating a crack stress intensity factor K1 by using simulation software according to the size and distribution characteristics of the crack defects; and then extracting a crack stress intensity factor K1, calculating the defect fatigue crack propagation life by utilizing a fracture mechanics Pairs formula, and evaluating the service life of the basin-type insulator to be detected.
2. The in-service basin-type insulator defect phased array detection and operation life assessment method of claim 1, characterized in that: the method comprises the steps of firstly detecting basin-type insulator basic information parameters including outer diameters, sealing ring groove widths, depths of two sides of sealing ring grooves and distances from outer sides of sealing rings to the outer diameters.
3. The in-service basin insulator defect phased array detection and operation life assessment method of claim 1, characterized in that: the ultrasonic phased array detector comprises a probe, a wafer, a power supply and a power supply, wherein the probe of the ultrasonic phased array detector is a self-focusing phased array probe, the frequency is 2.25MHz, the number of wafers is 16, the wafer interval is 0.5mm, and the wafer length is 10 mm.
4. The in-service basin insulator defect phased array detection and operation life assessment method of claim 1, characterized in that: the detection parameters in the step three are set and adjusted according to the following method:
inputting the distance from the outer side of a sealing ring of a basin-type insulator to be detected to the outer diameter, namely the thickness of a workpiece; meanwhile, adjusting the corresponding focusing depth to be consistent with the distance from the outer side of the sealing ring of the basin-type insulator to be detected to the outer diameter;
secondly, placing a probe at any side of a bolt hole of the basin-type insulator to be detected, and performing actual sound velocity calibration by using the depth of two sides of a sealing ring groove of the basin-type insulator to be detected in a phased array transverse wave detection mode;
thirdly, adjusting the excitation times, the reflection times, the sound path display range and the gain dB value of the ultrasonic phased array detector, and adjusting the emission echoes of the depth grooves on the two sides of the seal ring groove to 80% of a full screen;
adjusting the scanning angle of the sector of the ultrasonic phased array detector, and setting the scanning angle to be within the range of the highest end angle reflectivity, namely 35-55 degrees.
5. The in-service basin insulator defect phased array detection and operation life assessment method of claim 1, characterized in that: the cracking defect in the step fife is judged according to the following method: when the area color is displayed in dark color within the range of the focusing depth, the cracking defect exists near the bolt hole; when only a single bottom reflection or no reflection area in the focusing range is displayed in dark color, no crack defect exists.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115308016A (en) * | 2022-08-17 | 2022-11-08 | 山东大学 | Basin-type insulator crack prediction method and system |
| CN116773667A (en) * | 2023-06-15 | 2023-09-19 | 上海发电设备成套设计研究院有限责任公司 | Method and device for monitoring crack safety of rotor blade root groove of nuclear turbine |
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2022
- 2022-05-11 CN CN202210509230.5A patent/CN114894901A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115308016A (en) * | 2022-08-17 | 2022-11-08 | 山东大学 | Basin-type insulator crack prediction method and system |
| CN115308016B (en) * | 2022-08-17 | 2024-01-02 | 山东大学 | Basin-type insulator crack prediction method and system |
| CN116773667A (en) * | 2023-06-15 | 2023-09-19 | 上海发电设备成套设计研究院有限责任公司 | Method and device for monitoring crack safety of rotor blade root groove of nuclear turbine |
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