CN111983019A - Phased array detection device and method for detecting lead sealing defects of cable terminal - Google Patents
Phased array detection device and method for detecting lead sealing defects of cable terminal Download PDFInfo
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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
- G01N29/043—Analysing solids in the interior, e.g. by shear waves
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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
- G01N29/22—Details, e.g. general constructional or apparatus details
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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
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/26—Arrangements for orientation or scanning by relative movement of the head and the sensor
- G01N29/265—Arrangements for orientation or scanning by relative movement of the head and the sensor by moving the sensor relative to a stationary material
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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
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/28—Details, e.g. general constructional or apparatus details providing acoustic coupling, e.g. water
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
- G01N2291/0234—Metals, e.g. steel
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
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Abstract
The invention discloses a phased array detection device and a phased array detection method for detecting a lead seal defect of a cable terminal, and belongs to the technical field of phased array ultrasonic detection. The invention can overcome the problems that the traditional ultrasonic is applied to an object with a curved surface, the coupling cannot cause the attenuation of the sound beam and the like, meanwhile, the detection efficiency and the detection precision are higher, and reliable technical guarantee can be provided for the safe, stable and efficient operation of the cable terminal after the cable terminal is put into operation.
Description
Technical Field
The invention relates to a phased array detection device and method for detecting a lead sealing defect of a cable terminal, and belongs to the technical field of phased array ultrasonic detection.
Background
With the development of urban power systems, the application of high-voltage cross-linked polyethylene single-core high-voltage power cables in urban power distribution networks is more and more extensive, and the cable load is increased day by day. The insulation performance of the high-voltage cross-linked cable line can be reduced due to various factors in the stages of capital construction, operation and maintenance and the like, and the safe and reliable operation of the high-voltage cross-linked cable line is influenced.
Because the cable accessories still depend on manual field operation in the manufacturing process, a large number of latent defects may be left in the technical processes such as cable breakage, wire compression, accessory copper pipe-cable aluminum sleeve lead sealing and the like.
In the cable manufacturing process, the lead seal plays an important role in sealing and waterproofing various terminals and middle connections of the metal sheath or aluminum sheath cable, so that the metal sheath of the cable can be connected with other electrical equipment to form a good grounding system. Especially, in the construction of various joints of high-voltage cables, a skilled lead sealing technology is required.
The lead seal of the aluminum sheath has the phenomena of gradual loosening of the lead seal, such as insufficient soldering, infirm soldering and the like. The loosened lead seal induces a copper tail pipe with higher suspension potential and low potential to generate potential difference, air breakdown discharge is formed, air ionization can generate thousands of high temperature, main insulation of the cable is gradually carbonized under the action of the high temperature, the insulation performance is reduced, and finally the cable breakdown fault is caused.
At present, an eddy current detection device is used for detecting the lead seal defects, but according to the experimental result, the method can only detect the defects on the surface of the lead seal and the larger cracks on the surface, but cannot detect the internal defects of the lead seal and the defects between the lead seal and the aluminum sheath layer.
When the conventional A ultrasonic wave and phased array ultrasonic wave are used for detecting the internal defects of the lead seal with the curved surface, good coupling can not be carried out, the attenuation of sound waves is serious in the propagation process, the detection precision is greatly reduced, and even the defects can not be detected.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a phased array detection device and a phased array detection method for detecting the lead seal defect of a cable terminal, wherein the phased array detection device is provided with a flexible water bag, and the device can well realize the coupling of a phased array probe and the lead seal surface by adopting the flexible water bag and can be well applied to the detection of the internal defect of the lead seal of the cable terminal.
The purpose of the invention can be realized by the following scheme:
the invention provides a phased array detection device for detecting the lead sealing defect of a cable terminal, which comprises the following components: the phased array probe, the shell and the display processing instrument further comprise a flexible water bag;
the shell is arranged on a cable terminal lead seal;
the flexible water bag is fixedly sealed at the bottom of the shell and is in direct contact with a lead seal of a cable terminal; water is injected into the flexible water bag;
the phased array probe is arranged in the shell and is directly arranged on the flexible water bag;
the phased array probe is internally provided with a sound wave generating, processing and receiving device; the phased array probe is externally connected with a display processing instrument through a signal transmission line.
Furthermore, the contact surface of the flexible water bag and the lead seal of the cable terminal is coupled by adopting a viscous coupling agent.
Further, the viscous coupling agent is engine oil, transformer oil, lubricating grease, glycerin, water glass, industrial glue or chemical paste.
Furthermore, the flexible water bag adopts an elastic silica gel film.
Further, the thickness of the silica gel film is 0.1mm-1 mm.
Further, the shell is cylindrical; the shell is made of aluminum or iron.
Furthermore, the frequency range of the phased array probe is 1-10 MHz, and the voltage range is 50-200V.
Furthermore, the total number of the wafers of the phased array probe is 1-32, the center distance of the wafers ranges from 0.01mm to 30mm, and the size of the wafers ranges from 0.01mm to 20 mm.
The invention also provides a phased array detection method for detecting the lead sealing defect of the cable terminal, which comprises the following steps:
(1) manufacturing a shell with an adaptive size according to the size of the lead sealing surface of the cable terminal to be detected;
(2) fixing and sealing the prepared flexible water bag at the bottom of the shell;
(3) smearing viscous coupling agent on the position to be detected on the lead sealing surface of the cable terminal, and placing the flexible water bag at the bottom of the shell on the lead sealing surface smeared with the viscous coupling agent;
(4) configuring phased array probe parameters;
(5) placing the phased array probe inside the shell, and injecting water into the shell until the front end of the phased array probe is submerged;
(6) placing a phased array probe at a preset position, detecting the internal defects of the lead seal of the cable terminal, and acquiring a scanning image;
(7) and moving the position of the phased array probe according to a preset track, repeatedly detecting the internal defects of the lead seal of the cable terminal, and acquiring a scanning image until a complete internal image of the lead seal of the cable terminal is obtained.
Further, in the step (4), configuring the phased array probe parameters includes:
configuring the number of phased array probes, scanning the mode quantity and detecting materials;
configuring sound wave modes including longitudinal waves and transverse waves;
configuring the sound velocity to be 1000-8000 m/s;
the configuration voltage comprises four stages of 50V, 100V, 150V and 200V;
configuring a seven-gear pulse repetition frequency comprising 1KHz, 1.5KHz, 2KHz, 2.5KHz, 3KHz, 4KHz and 5 KHz;
the configuration frequency band comprises 4 gears of 2.5M, 5M, 7.5M and 10M;
the configuration smoothing includes two options, yes and no;
configuring the type of the phased array probe to comprise two options of a one-dimensional linear array and a ring array;
configuring the frequency of a phased array probe to be in a range of 1MHz to 10 MHz;
the total number of the wafers, the number of the starting wafers and the number of the effective wafers of the phased array probe are all in the range of 1-32;
configuring the size of a phased array probe wafer to be 0.01 mm-20 mm, and the center distance of the wafer to be 0.01 mm-30 mm;
selecting a welding seam according to the actual field working condition;
configuring a scanning type comprising two options of fan scanning and line scanning;
configuring a focusing type comprising three options of depth, sound path and level;
configuring the resolution ratio to be in the range of 0.5-5 degrees;
configuring a starting angle and a stopping angle within a range of-90 to 90 degrees;
configuring the focusing distance to be 0-1000 mm;
configuring the range starting point and the range ending point within the range of 0-900 mm;
configuring the distance from the front end of the phased array probe to the center of the welding seam to be 0-1000 mm;
the configuration calibration functions include delay calibration, sound speed calibration, angle compensation, distance compensation, and DAC curve making.
Further, the preset trajectory is:
presetting a measuring point position;
or,
moving in a clockwise direction from the initial position.
The invention has the following beneficial effects:
(1) the phased array detection device comprises a phased array probe, a shell and a flexible water sac, wherein the shell is arranged on a lead seal of a cable terminal, the flexible water sac is fixedly sealed at the bottom of the shell and is in direct contact with the lead seal of the cable terminal, and the phased array probe is arranged in the shell and is directly arranged on the flexible water sac. The lead sealing device is simple in structure, convenient to operate, strong in replaceability of manufacturing materials of all parts, small in limitation, incapable of detecting because the surface of the lead seal to be detected is a cambered surface, capable of achieving good coupling, and higher in detection precision and detection efficiency compared with a conventional detection mode.
(2) The bottom of the flexible water bag and the surface of the lead seal are coated with viscous coupling agent, so that the flexible water bag can play a role in fixing, and the phased array probe can move freely in the shell, so that the position and the size of a defect can be better detected, and a more reliable defect map can be obtained.
Drawings
Fig. 1 is a schematic view of a phased array nondestructive testing device for detecting the lead sealing defect of the cable terminal.
Figure 2 is a schematic view of a scan of a phased array probe of the present invention.
FIG. 3 shows the scanning result of the actual sample defect in the embodiment of the present invention.
Wherein, the method comprises the steps of 1-phased array probe, 2-shell, 3-flexible water bag, 4-bottom of shell, 5-lead sealing of cable terminal and 6-defect.
Detailed Description
The invention is further described below. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Referring to fig. 1, an embodiment of the present invention provides a phased array detection apparatus for detecting a lead sealing defect of a cable terminal, including a phased array probe 1, a housing 2, and a flexible water bag 3. The phased array probe internally comprises a sound wave generating, processing and receiving device. The phased array probe is externally connected with a display processing instrument integrating a display and a signal processor through a signal transmission line.
Specifically, the shell 2 is arranged on the lead seal 5 of the cable terminal, the flexible water bag 3 is fixedly sealed at the bottom 4 of the shell, the phased array probe 1 is arranged in the shell and is directly arranged on the flexible water bag 3, and other redundant operations and configurations are not needed, so that the operation is simple.
Specifically, flexible water pocket 3 and 5 direct contact of cable termination lead sealing, the contact surface of flexible water pocket 3 and 5 cable termination lead sealing adopts the viscous coupling agent that is used for nondestructive test of specialty to carry out the coupling, and the purpose is in order to let the sound wave that the phased array probe sent not to appear seriously attenuate to and carry out certain fixed action to whole detection device, not let it remove at will.
Preferably, the viscous coupling agent is engine oil, transformer oil, lubricating grease, glycerin, water glass, industrial glue or chemical paste and the like.
Specifically, water is injected into the flexible water bag 3 to serve as a coupling agent, so that the phased array probe is better coupled.
Specifically, the flexible water bag 3 is made of an elastic silica gel film.
Preferably, the thickness of the silica gel film is 0.1mm to 1 mm.
Specifically, the shell 2 can be a cylinder type and other shapes convenient to detect, and ensure that the phased array probe is fixed at any position inside, so that a scanning blind area cannot exist, the material can be made of metal materials such as aluminum and iron, and in order to be manufactured more easily, the bottom of the phased array probe can be cut off by using a paper cup commonly used in our life. The size can be designed according to the size of the sample to be detected.
Specifically, the phased array probe can be a plurality of, place on the inside flexible water pocket 3 of shell 2, the inside water that pours into of shell into, the front end that the phased array probe was flooded to the water yield.
Specifically, the frequency range of the phased array probe is 1-10 MHz, and the voltage range is 50-200V.
Specifically, the total number of wafers of the phased array probe is 1-32, the center distance is adjustable within 0.01 mm-30 mm, and the size of the wafer is adjustable within 0.01 mm-20 mm.
The embodiment of the invention also provides a phased array detection method for detecting the lead sealing defect of the cable terminal, which comprises the following steps:
step 1: the method comprises the following steps of (1) detecting the size of the lead sealing surface of the cable terminal according to needs to manufacture a proper shell, wherein the shape of the shell is cylindrical and is proper;
step 2: fixing and sealing the silica gel film for manufacturing the flexible water bag at the bottom of the shell;
and step 3: smearing viscous coupling agent on the position to be detected on the lead sealing surface of the cable terminal, and directly placing the flexible water bag fixedly sealed at the bottom of the shell on the lead sealing surface smeared with the viscous coupling agent;
and 4, step 4: setting a focusing rule of a phased array probe according to the field working condition, wherein the focusing rule comprises five columns of detection, probe, wedge block, welding line and scanning;
the detection device comprises a phased array probe quantity selection device (generally fixed as 1), a scanning mode quantity device (fixed as single-side scanning), detection materials, a sound wave mode (longitudinal wave and transverse wave), sound velocity (adjustable 1000-8000M/s), voltage (adjustable 50V/100V/150V/200V, four gears are adjustable), pulse repetition frequency (1KHz/1.5KHz/2KHz/2.5KHz/3KHz/4KHz/5KHz, seven gears are selectable), frequency band (2.5M/5M/7.5M/10M, 4 gears are selectable), and smoothness (selectable whether or not);
the probe setting is selected to include type selection (one-dimensional linear array/annular array is selectable), frequency (1 MHz-10 MHz is adjustable), total number of wafers, initial wafers and effective wafers are (1-32 selectable), size of the wafers is (0.01 mm-20 mm is adjustable), and center distance of the wafers is (0.01 mm-30 mm is adjustable);
the device of the embodiment of the invention does not need a wedge block;
the welding seam can be selected according to the actual field working condition;
the scanning setting comprises a scanning type (fan scanning/line scanning), a focusing type (depth/sound path/horizontal selectable), a resolution (0.5-5 degrees selectable), a starting angle and a stopping angle which are both (-90 degrees adjustable), a focusing distance (0-1000 mm adjustable), a range starting point and a range ending point which are both (0-900 mm adjustable), and a distance (0-1000 mm adjustable) between the front end of the probe and the center of the welding line; whether a calibration function (delay calibration, sound speed calibration, angle compensation, distance compensation and DAC curve manufacturing) is needed later;
and 5: the phased array probe is placed inside the shell, then proper water is injected into the shell, the front end of the phased array probe can be submerged, and ultrasonic coupling in any direction can be realized;
step 6: placing a phased array probe at the position shown in the figure 1, dividing the scanning position into 5 areas as shown in the figure 1, defining the middle area as the first area, then dividing the periphery into four areas with the respective labels of the four areas as the second area, the third area, the fourth area and the fifth area, detecting the internal defect of the lead seal, and storing the detected internal image of the lead seal and the echo of the defect 6 as T1, wherein the scanning range of the phased array probe is shown in the figure 2;
dividing scanning areas, wherein the main purpose is to better determine the defect position according to the obtained phased array image and defect echo, and the scanning position and sequence can be flexibly changed according to the field condition;
and 7: after the detection of the position I is finished, the position of the phased array probe is moved according to the divided area, the probe is moved to the position II, the position II is detected by the method of detecting the position I, and a local image T2 is obtained similarly; sequentially carrying out multiple times of ultrasonic phased array local imaging at the third, fourth and fifth positions, and respectively storing the obtained local ultrasonic phased array images as T3, T4 and T5; the purpose of scanning is to scan defects from different places due to the limitation of the detection angle and the detection range of the probe, so that a complete lead seal internal image can be obtained, the positions and the sizes of the defects can be analyzed from the measured phased array image, and the image obtained by actual test detection is shown in fig. 3.
Preferably, in the actual test process, the phased array probe can also be slowly moved from the position of (1) in fig. 1 in the clockwise moving direction, meanwhile, the internal image of the lead seal on the display screen of the phased array device is paid attention to constantly, whether the defect exists or not and the definition and the size of the defect image are checked, if the defect exists, the probe is continuously moved until the displayed image is clear, and the position of the probe is marked.
The lead seal internal defect detection device provided by the embodiment of the invention can also realize detection on a detection object with a cambered surface by adopting a common ultrasonic probe, has multiple application scenes, simple structure and easy operation, can realize omnibearing defect detection in the lead seal of the power transmission line terminal, can analyze the performance state of the lead seal of the cable terminal by utilizing a detection image and echo, and provides reliable basic support and guarantee for safe and stable operation of a power system.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (11)
1. A phased array detection device for detecting a lead sealing defect of a cable terminal comprises: the phased array probe, the shell and the display processing instrument are characterized by further comprising a flexible water bag;
the shell is arranged on a cable terminal lead seal;
the flexible water bag is fixedly sealed at the bottom of the shell and is in direct contact with a lead seal of a cable terminal; water is injected into the flexible water bag;
the phased array probe is arranged in the shell and is directly arranged on the flexible water bag;
the phased array probe is internally provided with a sound wave generating, processing and receiving device; the phased array probe is externally connected with a display processing instrument through a signal transmission line.
2. The phased array detection device for detecting the lead seal defect of the cable terminal as claimed in claim 1, wherein the contact surface of the flexible water bag and the lead seal of the cable terminal is coupled by using a viscous coupling agent.
3. The phased array detection device for detecting the lead sealing defect of the cable terminal as claimed in claim 2, wherein the viscous coupling agent is engine oil, transformer oil, lubricating grease, glycerin, water glass, industrial glue or chemical paste.
4. The phased array detection device for detecting the lead sealing defect of the cable terminal as claimed in claim 1, wherein the flexible water bag is made of an elastic silica gel film.
5. The phased array detection device for detecting the lead sealing defect of the cable terminal as claimed in claim 4, wherein the thickness of the silica gel film is 0.1mm-1 mm.
6. The phased array detection device for detecting the lead sealing defect of the cable terminal as claimed in claim 1, wherein the housing is cylindrical; the shell is made of aluminum or iron.
7. The phased array detection device for detecting the lead sealing defect of the cable terminal is characterized in that the frequency range of the phased array probe is 1-10 MHz, and the voltage range is 50-200V.
8. The phased array detection device for detecting the lead sealing defect of the cable terminal as claimed in claim 1, wherein the total number of the wafers of the phased array probe is 1-32, the center-to-center distance between the wafers is 0.01-30 mm, and the wafer size is 0.01-20 mm.
9. A phased array detection method for detecting the lead sealing defect of a cable terminal is characterized by comprising the following steps:
(1) manufacturing a shell with an adaptive size according to the size of the lead sealing surface of the cable terminal to be detected;
(2) fixing and sealing the prepared flexible water bag at the bottom of the shell;
(3) smearing viscous coupling agent on the position to be detected on the lead sealing surface of the cable terminal, and placing the flexible water bag at the bottom of the shell on the lead sealing surface smeared with the viscous coupling agent;
(4) configuring phased array probe parameters;
(5) placing the phased array probe inside the shell, and injecting water into the shell until the front end of the phased array probe is submerged;
(6) placing a phased array probe at a preset position, detecting the internal defects of the lead seal of the cable terminal, and acquiring a scanning image;
(7) and moving the position of the phased array probe according to a preset track, repeatedly detecting the internal defects of the lead seal of the cable terminal, and acquiring a scanning image until a complete internal image of the lead seal of the cable terminal is obtained.
10. The phased array inspection method for detecting the lead sealing defect of the cable terminal according to claim 9, wherein in the step (4), configuring the phased array probe parameters comprises:
configuring the number of phased array probes, scanning the mode quantity and detecting materials;
configuring sound wave modes including longitudinal waves and transverse waves;
configuring the sound velocity to be 1000-8000 m/s;
the configuration voltage comprises four stages of 50V, 100V, 150V and 200V;
configuring a seven-gear pulse repetition frequency comprising 1KHz, 1.5KHz, 2KHz, 2.5KHz, 3KHz, 4KHz and 5 KHz;
the configuration frequency band comprises 4 gears of 2.5M, 5M, 7.5M and 10M;
the configuration smoothing includes two options, yes and no;
configuring the type of the phased array probe to comprise two options of a one-dimensional linear array and a ring array;
configuring the frequency of a phased array probe to be in a range of 1MHz to 10 MHz;
the total number of the wafers, the number of the starting wafers and the number of the effective wafers of the phased array probe are all in the range of 1-32;
configuring the size of a phased array probe wafer to be 0.01 mm-20 mm, and the center distance of the wafer to be 0.01 mm-30 mm;
selecting a welding seam according to the actual field working condition;
configuring a scanning type comprising two options of fan scanning and line scanning;
configuring a focusing type comprising three options of depth, sound path and level;
configuring the resolution ratio to be in the range of 0.5-5 degrees;
configuring a starting angle and a stopping angle within a range of-90 to 90 degrees;
configuring the focusing distance to be 0-1000 mm;
configuring the range starting point and the range ending point within the range of 0-900 mm;
configuring the distance from the front end of the phased array probe to the center of the welding seam to be 0-1000 mm;
the configuration calibration functions include delay calibration, sound speed calibration, angle compensation, distance compensation, and DAC curve making.
11. The phased array detection method for detecting the lead sealing defect of the cable terminal according to claim 9, wherein the preset track is as follows:
presetting a measuring point position;
or,
moving in a clockwise direction from the initial position.
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| CN115856088A (en) * | 2023-03-01 | 2023-03-28 | 广东惠丰达电气设备有限公司 | High-voltage cable lead sealing quality detection system based on phased array ultrasonic imaging technology |
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