CN114674915A - Cable lead sealing defect depth detection device and method based on multi-frequency eddy current - Google Patents
Cable lead sealing defect depth detection device and method based on multi-frequency eddy current Download PDFInfo
- Publication number
- CN114674915A CN114674915A CN202210246267.3A CN202210246267A CN114674915A CN 114674915 A CN114674915 A CN 114674915A CN 202210246267 A CN202210246267 A CN 202210246267A CN 114674915 A CN114674915 A CN 114674915A
- Authority
- CN
- China
- Prior art keywords
- signal
- probe body
- sensor
- sensors
- signal receiving
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
- G01N27/9093—Arrangements for supporting the sensor; Combinations of eddy-current sensors and auxiliary arrangements for marking or for rejecting
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
- G01N27/9013—Arrangements for scanning
- G01N27/902—Arrangements for scanning by moving the sensors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
- G01N27/904—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents with two or more sensors
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
The invention relates to a cable lead sealing defect depth detection device based on multifrequency eddy current, which comprises a multichannel signal acquisition and transmission unit, a signal processing unit and a display unit, wherein the multichannel signal acquisition and transmission unit comprises an outer joint, a sensor inner connecting wire, a signal transmitting sensor, a signal receiving sensor and a probe body, and the signal transmitting sensor and the signal receiving sensor are both arranged on the probe body; the outer joint is arranged on the probe body, the transmitting sensor and the signal receiving sensor are connected with the inner connecting wires of the sensors, and the outer ends of the inner connecting wires of all the sensors penetrate through the outer joint and extend outwards; the signal transmitting sensor and the signal receiving sensor are in signal connection with the signal processing unit, and the signal processing unit is electrically connected with the display unit. The invention further comprises a cable lead sealing defect depth detection method based on the multi-frequency eddy current. The invention can detect the deeper cable lead seal, has high detection efficiency and is convenient, and belongs to the technical field of cable nondestructive detection.
Description
Technical Field
The invention relates to the technical field of cable non-damage detection, in particular to a cable lead sealing defect depth detection device and method based on multi-frequency eddy current.
Background
The main cause of the high-voltage cable failure is the quality defect of the cable body and accessories. The lead lining is used as a key process for field installation of high-voltage cable accessories, and the quality of lead sealing directly influences the safe and stable operation of the high-voltage cable. Because the traditional lead sealing process can only be manually processed, once the defects of cracking, holes and the like of the lead seal occur due to the factors of insufficient execution of the construction process or stress, vibration and the like in operation, the accessory is easy to be affected with moisture or poor in electrical connection, the insulation degree is reduced, and the fault tripping of a high-voltage cable line and even the cable breakdown accident are caused.
Traditional lead sealing detection needs to remove cable jacket pyrocondensation cover to advance manual inspection, belongs to destructive test, and is inefficient. The existing detection method can only detect the surface defects of the lead seal, and the traditional eddy current detection method can only detect the surface or near-surface defects of the test piece.
At present, the cable accessory has high defect detection difficulty, and lead seal is easy to have the defects of mechanical damage, corrosion, cracking, sand hole, deformation and the like. The traditional eddy current detection is influenced by factors such as small probe size, low detection efficiency, weak signal penetration capacity, low sensitivity and the like, so that the damage condition inside a cable accessory is difficult to accurately detect; the eddy current testing is applied to the detection of the lead seal depth defect of the power cable, and the lead seal detection workload is large due to the complex operation condition of the cable.
The main difficulties are as follows: 1. the eddy current array detection technology is applied to cable lead seal detection in an in-service state, a new, faster and convenient method is provided for detecting the cable lead seal defect, but no multi-channel detection probe detection device specially made for the cable lead seal exists at present, the detection efficiency is low, and the reliability is low.
2. The low-frequency signal has strong penetration and is easy to enter a deeper part of the lead seal of the cable, but the detection sensitivity of the low-frequency signal is relatively low, and the detection sensitivity of the high-frequency signal is relatively high, but the penetration depth is limited. At present, the two are not combined and applied to eddy current detection, and the detection difficulty is higher.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention aims to: the cable lead sealing defect depth detection device based on the multi-frequency eddy current is high in detection efficiency and convenient to detect the cable lead sealing with more depth
Another object of the invention is: the cable lead seal defect depth detection method based on the multi-frequency eddy current is simple to operate and capable of achieving deeper cable lead seal detection.
In order to achieve the purpose, the invention adopts the following technical scheme:
a cable lead sealing defect depth detection device based on multi-frequency eddy current comprises a multi-channel signal acquisition and transmission unit, a signal processing unit and a display unit, wherein the multi-channel signal acquisition and transmission unit comprises an outer joint, a sensor inner connecting wire, signal transmitting sensors, signal receiving sensors and a probe body, and the number of the signal receiving sensors is twice that of the signal transmitting sensors; the signal transmitting sensor and the signal receiving sensor are both arranged at one end of the probe body; the outer joint is arranged at the other end of the probe body, a signal transmitting sensor is connected with a sensor inner connecting wire and the outer joint, a signal receiving sensor is connected with a sensor inner connecting wire, and the outer ends of all the sensor inner connecting wires penetrate through the outer joint and extend outwards; the signal transmitting sensor and the signal receiving sensor are in signal connection with the signal processing unit, and the signal processing unit is electrically connected with the display unit.
Preferably, the probe body comprises a detection probe body and a fixed probe body, the detection probe body is installed on the fixed probe body, the signal transmitting sensor and the signal receiving sensor are both installed on the detection probe body, and the external joint is installed on the fixed probe body.
Preferably, the detection probe body and the fixed probe body are both in an arc block structure, one end of the detection probe body protruding outwards is attached to and fixed with one end of the fixed probe body recessed inwards, the external joint is installed at one end of the fixed probe body protruding outwards, and the signal transmitting sensor and the signal receiving sensor are installed at one end of the detection probe body recessed inwards.
Preferably, the thickness of the fixed probe body is 180-240mm, and the diameter of the fixed probe body is 80-120mm, and the fixed probe body is prepared from glass fiber reinforced flame-retardant PBT.
Preferably, the fixed probe body is provided with a communication channel, and the external joint is arranged on the communication channel; the detection probe body is provided with connecting holes, the number of the connecting holes is set corresponding to the number of the signal transmitting sensors and the signal receiving sensors, and all the connecting holes are the same as the communicating channels; a signal transmitting sensor is mounted on a connecting hole, a signal receiving sensor is mounted on a connecting hole, and all the sensor internal wirings are extended from the connecting hole, collected into the communicating channel and extended out of the communicating channel.
Preferably, the number of the signal receiving sensors is four, the number of the signal transmitting sensors is two, the number of the connecting holes is six, and the six connecting holes are uniformly distributed at one end, inwards concave, of the detection probe body along the circumferential direction; the two signal transmitting sensors are respectively embedded into the two connecting holes in the middle, the four signal receiving sensors are respectively arranged in the four connecting holes, and the four signal receiving sensors are respectively distributed on two sides of the two signal transmitting sensors in pairs; two signal emission sensors are in signal connection with the signal processing unit, and four signal receiving sensors are in signal connection with the signal processing unit.
Preferably, one of the two emission signal sensors emits a signal of 10KHz, and the other of the two emission signal sensors emits a signal of 10 Hz.
Preferably, the diameters of the transmitting signal sensor and the signal receiving sensor are both 0.4 mm; the number of turns of the coil of the transmitting signal sensor and the number of turns of the coil of the signal receiving sensor are both 60-100 turns, and the transmitting signal sensor and the signal receiving sensor are both made of nanocrystalline soft magnetic alloy.
Preferably, the included angle of two connecting holes at two ends in the six connecting holes on the detection probe body is 120 degrees.
A cable lead sealing defect depth detection method based on multi-frequency eddy current adopts a cable lead sealing defect depth detection device based on multi-frequency eddy current, and comprises the steps of transmitting waves of different frequency bands by two transmitting signal sensors to be superposed into a modulation wave, detecting the cable lead sealing by the modulation wave, receiving information of the cable lead sealing by a signal receiving sensor, transmitting the information of the cable lead sealing to a signal processing unit by the signal receiving sensor, and displaying lead sealing detection information by a display unit so as to obtain the cable lead sealing condition.
The theoretical basis of the invention is as follows:
1. eddy current flaw detection is based on the principle of electromagnetic induction, and according to the characteristics of electromagnetic waves, low-frequency electromagnetic waves exhibit low signal attenuation, so that the eddy current flaw detection is suitable for long-distance transmission, and has strong penetrating power but low accuracy, while high-frequency electromagnetic waves have weaker penetrating power than low-frequency electromagnetic waves but high accuracy. The electromagnetic wave used for eddy current inspection is generally a high-frequency electromagnetic wave. In order to better realize the accuracy of eddy current detection, an uplink is taken as a low-frequency pulse in a system firstly according to the principle of superposition of electromagnetic waves with different frequencies; the back down link is high-frequency pulse with equal amplitude, when the low-frequency pulse detects that the information of the lead seal is transmitted to the system, the information is overlapped with the high-frequency pulse with equal amplitude and is transmitted to the system for lead seal analysis, and the defect type with deeper depth can be detected.
2. Wave picking processing of signals:
detection refers to the process of detecting a modulated signal from a modulated signal. The purpose of demodulation is therefore to recover the modulated signal. The amplitude modulated wave and the carrier wave may be multiplied for demodulation and then filtered by a high pass filter. The most common demodulation methods are rectification detection and phase-sensitive detection. If the modulated signal is biased and a direct current component is superposed to make the biased signal have positive voltage, the envelope curve of amplitude modulated wave has the shape of original modulated signal, and the amplitude modulated wave is undergone the processes of simple half-wave or full-wave rectification and filtering, and the added bias voltage can be subtracted so as to recover original modulated signal.
The eddy current test signal is generated by a varying magnetic field intersecting the lead seal of the cable. In short, it is caused by the electromagnetic induction effect. This action creates a current that circulates in the conductor. The faster the magnetic field changes, the greater the induced electromotive force and the stronger the eddy current.
Eddy current signals generated by the high-frequency electromagnetic wave signals and the low-frequency electromagnetic wave signals act on the sensor respectively in return, the sensor transmits the acquired signal change to the analysis host, and the analysis host extracts characteristic values from the superposed pulse eddy current signals and maps the characteristic values with corresponding thickness information. The pulse signal is subjected to harmonic analysis by Fourier transform to extract information such as amplitude. And obtaining a valid measurement signal through filtering, and processing and analyzing the signal. And analyzing the state of the lead seal by observing the change of the impedance value corresponding to the measuring signal.
In general, the present invention has the following advantages:
1. the invention utilizes high-frequency electromagnetic wave with high precision, low-frequency electromagnetic wave suitable for long-distance transmission and strong penetrating power, and high-frequency and low-frequency electromagnetic wave signals are superposed to obtain a modulated wave which can realize detection of deeper cable lead sealing information.
2. The invention belongs to nondestructive detection, can realize the detection of the lead seal of the cable without damaging the existing structure of the cable, and has convenient and rapid operation.
3. The multi-channel probe of the invention consists of a plurality of sensors which are driven in an electronic way and are placed in a distributed way. Each individual sensor in the probe produces a signal that is in phase and amplitude relative to the structure below it. This data is associated with the encoding position and time and is represented in the form of an image. The multi-channel detection probe can improve the detection capability and greatly save time; by signal coupling, a larger area can be covered by a single probe scan while high resolution is maintained; complex robot technology is not needed to move the probe, and simple manual scanning is enough to complete detection; the defect detection depth and the quantitative performance are improved.
4. The detection probe body and the fixed probe body are both arc-shaped block structures, and the design is matched with the appearance of the cable, so that the optimal coupling effect can be obtained.
5. The invention adopts a signal conversion processing technology, can effectively inhibit interference signals and realize accurate detection under the cable running condition.
Drawings
Fig. 1 is a schematic diagram of a cable lead sealing defect depth detection device based on multifrequency eddy current.
Fig. 2 is a schematic diagram of a multi-channel signal acquisition and transmission unit.
Fig. 3 is a perspective view of the multi-channel signal acquisition and transmission unit.
Fig. 4 is a graph of the accuracy of detecting lead seal information under the condition that electromagnetic wave signals with three different frequencies are at the same depth.
Fig. 5 is a graph showing the superposition of two signals from a signal emitting sensor.
The device comprises a fixed probe body 1, a detection probe body 2, a connecting hole 3, a sensor inner connecting wire 4, an outer joint 5, a transmitting signal sensor 6 and a signal receiving sensor 7.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments.
A cable lead sealing defect depth detection device based on multi-frequency eddy current comprises a multi-channel signal acquisition and transmission unit, a signal processing unit and a display unit, wherein the multi-channel signal acquisition and transmission unit comprises an outer joint, a sensor inner connecting wire, signal transmitting sensors, signal receiving sensors and a probe body, and the number of the signal receiving sensors is twice that of the signal transmitting sensors; the signal transmitting sensor and the signal receiving sensor are both arranged at one end of the probe body; the outer joint is arranged at the other end of the probe body, a signal transmitting sensor is connected with a sensor inner connecting wire and the outer joint, a signal receiving sensor is connected with a sensor inner connecting wire, and the outer ends of all the sensor inner connecting wires penetrate through the outer joint and extend outwards; the signal transmitting sensor and the signal receiving sensor are in signal connection with the signal processing unit, and the signal processing unit is electrically connected with the display unit.
The probe body includes test probe body and fixed probe body, and the test probe body is installed at the fixed probe body, and signal transmission sensor and signal reception sensor are all installed at the test probe body, and the external joint is installed at the fixed probe body.
The detection probe body and the fixed probe body are both of arc-shaped block structures, the outward convex end of the detection probe body is attached and fixed with the inward concave end of the fixed probe body, the external joint is installed at the outward convex end of the fixed probe body, and the signal transmitting sensor and the signal receiving sensor are both installed at the inward concave end of the detection probe body.
The thickness of the fixed probe body is 180-240mm, and the diameter of the fixed probe body is 80-120mm, and the fixed probe body is prepared from glass fiber reinforced flame-retardant PBT. The fixed probe body of this embodiment has a thickness of 225mm and a diameter of 100 mm.
The fixed probe body is provided with a communicating channel, and the external joint is arranged on the communicating channel; the detection probe body is provided with connecting holes, the number of the connecting holes corresponds to the number of the signal transmitting sensors and the signal receiving sensors, and all the connecting holes are the same as the communication channel; a signal transmitting sensor is mounted on a connecting hole, a signal receiving sensor is mounted on a connecting hole, and all the sensor internal wirings are extended from the connecting hole, collected into the communicating channel and extended out of the communicating channel.
The number of the signal receiving sensors is four, the number of the signal transmitting sensors is two, the number of the connecting holes is six, and the six connecting holes are uniformly distributed at one end, inwards concave, of the detection probe body along the circumferential direction; the two signal transmitting sensors are respectively embedded into the two connecting holes in the middle, the four signal receiving sensors are respectively arranged in the four connecting holes, and the four signal receiving sensors are respectively distributed on two sides of the two signal transmitting sensors in pairs; two signal emission sensors are in signal connection with the signal processing unit, and four signal receiving sensors are in signal connection with the signal processing unit.
One of the two emission signal sensors emits a signal of 10KHz, and the other emission signal sensor emits a signal of 10 Hz.
The diameters of the transmitting signal sensor and the signal receiving sensor are both 0.4 mm; the number of turns of the coil of the transmitting signal sensor and the number of turns of the coil of the signal receiving sensor are both 60-100 turns, and the transmitting signal sensor and the signal receiving sensor are both made of nanocrystalline soft magnetic alloy.
The external joint of this embodiment adopts external N type head.
And in the six connecting holes, the included angle of two connecting holes at two ends on the detection probe body is 120 degrees.
A cable lead sealing defect depth detection method based on multi-frequency eddy current adopts a cable lead sealing defect depth detection device based on multi-frequency eddy current, and comprises the steps of transmitting waves of different frequency bands by two transmitting signal sensors to be superposed into a modulation wave, detecting the cable lead sealing by the modulation wave, receiving information of the cable lead sealing by a signal receiving sensor, transmitting the information of the cable lead sealing to a signal processing unit by the signal receiving sensor, and displaying lead sealing detection information by a display unit so as to obtain the cable lead sealing condition.
The specific detection steps are as follows:
step 1: the test method and equipment are selected according to the property, voltage grade and size of the equipment to be tested, and the type and size of the defect to be detected.
And 2, step: pretreating the detected workpiece to remove surface dirt, adsorbed impurities and the like;
and step 3: preparing a reference block according to corresponding technical conditions or standards;
and 4, step 4: the test frequency is determined. The test frequency is typically selected at 10Hz and 10 kHz. Selected by the thickness of the workpiece to be inspected, the desired penetration depth, the sensitivity to be achieved, etc. The lower the frequency, the greater the skin concentration, and the appropriate signal is selected for modulation.
And 5: and adjusting the instrument. Equilibrium form of the selected instrument: automatic, manual, or not required; selecting sensitivity; phase adjustment; selecting a filter form and frequency; adjusting an alarm storage battery; the sensitivity of the recorder is well adjusted; adjusting a delay time of the marking device; an automatic sort level is determined.
And 6: the test is started. The test is carried out under the selected standard, and the fixed moving speed is kept as much as possible while the distance between the sensor and the test piece is kept unchanged.
And 7: and (3) test recording: test piece condition, detection condition, and evaluation of detection standard according to acceptance structure.
At the same time of detection, the corresponding effect of each step is as follows:
1. signal modulation: and adjusting high-frequency and low-frequency signals according to the thickness of the lead seal to be detected and the detection precision requirement to obtain a proper modulation wave, so that the corresponding depth defect on the test block can be detected. And simultaneously meets the precision requirement.
2. Signal acquisition: and saving and calling the modulated device parameters. The probe is arranged on the surface of the lead seal to be detected and moves uniformly in the circumferential direction and the longitudinal direction respectively to obtain the information of the surface of the lead seal.
3. Signal calibration: during the detection process, signal calibration should be performed on the test block when the detection site is changed and an abnormal signal is encountered. The detection data is guaranteed to be real and reliable.
4. Signal processing; and (4) carrying out detection processing on the signals collected at the front end to obtain effective detection signals, and carrying out comparative analysis to obtain a detection result.
5. And (4) defect judgment: comparing the impedance variation and combining the test block data to determine whether the defect exists and the severity of the defect, and giving corresponding treatment suggestions.
6. The cable field detection is developed, the modulation wave is found to penetrate the high-frequency component into the depth of the cable lead seal, the defect in the depth of the cable is excited, and the amplitude of the defect can be more visually reflected to the display screen. The modulation wave is more sensitive to deeper signal excitation through experiments.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such modifications are intended to be included in the scope of the present invention.
Claims (10)
1. The utility model provides a cable lead sealing defect degree of depth detection device based on multifrequency vortex which characterized in that: the multi-channel signal acquisition and transmission unit comprises an outer joint, a sensor inner connecting wire, signal transmitting sensors, signal receiving sensors and a probe body, wherein the number of the signal receiving sensors is twice that of the signal transmitting sensors; the signal transmitting sensor and the signal receiving sensor are both arranged at one end of the probe body; the outer joint is arranged at the other end of the probe body, a signal transmitting sensor is connected with a sensor inner connecting wire and the outer joint, a signal receiving sensor is connected with a sensor inner connecting wire, and the outer ends of all the sensor inner connecting wires penetrate through the outer joint and extend outwards; the signal transmitting sensor and the signal receiving sensor are in signal connection with the signal processing unit, and the signal processing unit is electrically connected with the display unit.
2. The device for detecting the depth of the cable lead sealing defect based on the multifrequency eddy currents as claimed in claim 1, wherein: the probe body includes test probe body and fixed probe body, and the test probe body is installed at the fixed probe body, and signal transmission sensor and signal reception sensor are all installed at the test probe body, and the external joint is installed at the fixed probe body.
3. The multi-frequency eddy current-based cable lead sealing defect depth detection device as claimed in claim 2, wherein: the detection probe body and the fixed probe body are both of arc block structures, one end of the detection probe body protruding outwards is attached to and fixed with one end of the fixed probe body recessing inwards, the outer joint is installed at one end of the fixed probe body protruding outwards, and the signal transmitting sensor and the signal receiving sensor are installed at one end of the detection probe body recessing inwards.
4. The device for detecting the depth of the cable lead sealing defect based on the multifrequency eddy currents as claimed in claim 3, wherein: the thickness of the fixed probe body is 180-240mm, the diameter of the fixed probe body is 80-120mm, and the fixed probe body is made of glass fiber reinforced flame-retardant PBT.
5. The device for detecting the depth of the cable lead sealing defect based on the multifrequency eddy currents as claimed in claim 4, wherein: the fixed probe body is provided with a communicating channel, and the external joint is arranged on the communicating channel; the detection probe body is provided with connecting holes, the number of the connecting holes is set corresponding to the number of the signal transmitting sensors and the signal receiving sensors, and all the connecting holes are the same as the communicating channels; a signal transmitting sensor is mounted on a connecting hole, a signal receiving sensor is mounted on a connecting hole, and all the sensor internal wirings are extended from the connecting hole, collected into the communicating channel and extended out of the communicating channel.
6. The device for detecting the depth of the cable lead sealing defect based on the multifrequency eddy currents as claimed in claim 5, wherein: the number of the signal receiving sensors is four, the number of the signal transmitting sensors is two, the number of the connecting holes is six, and the six connecting holes are uniformly distributed at one end, inwards concave, of the detection probe body along the circumferential direction; the two signal transmitting sensors are respectively embedded into the two connecting holes in the middle, the four signal receiving sensors are respectively arranged in the four connecting holes, and the four signal receiving sensors are respectively distributed on two sides of the two signal transmitting sensors in pairs; two signal emission sensors are in signal connection with the signal processing unit, and four signal receiving sensors are in signal connection with the signal processing unit.
7. The device for detecting the depth of the cable lead sealing defect based on the multifrequency eddy current as claimed in claim 1, wherein: one of the two emission signal sensors emits a signal of 10KHz, and the other of the two emission signal sensors emits a signal of 10 Hz.
8. The device for detecting the depth of the cable lead sealing defect based on the multifrequency eddy current as claimed in claim 1, wherein: the diameters of the transmitting signal sensor and the signal receiving sensor are both 0.4 mm; the number of turns of the coil of the transmitting signal sensor and the number of turns of the coil of the signal receiving sensor are both 60-100 turns, and the transmitting signal sensor and the signal receiving sensor are both made of nanocrystalline soft magnetic alloy.
9. The device for detecting the depth of the cable lead sealing defect based on the multifrequency eddy currents as claimed in claim 1, wherein: among the six connecting holes, the included angle of two connecting holes at two ends on the detection probe body is 120 degrees.
10. A cable lead sealing defect depth detection method based on multifrequency eddy currents, which adopts the cable lead sealing defect depth detection device based on multifrequency eddy currents as claimed in any one of claims 1 to 9, and is characterized in that: the method comprises the steps that two transmitting signal sensors transmit waves of different frequency bands to be superposed into a modulation wave, the modulation wave detects the lead seal of the cable, a signal receiving sensor receives information of the lead seal of the cable, the signal receiving sensor transmits the information of the lead seal of the cable to a signal processing unit, and a display unit displays the detection information of the lead seal, so that the lead seal condition of the cable is obtained.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210246267.3A CN114674915A (en) | 2022-03-14 | 2022-03-14 | Cable lead sealing defect depth detection device and method based on multi-frequency eddy current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210246267.3A CN114674915A (en) | 2022-03-14 | 2022-03-14 | Cable lead sealing defect depth detection device and method based on multi-frequency eddy current |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114674915A true CN114674915A (en) | 2022-06-28 |
Family
ID=82074708
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210246267.3A Pending CN114674915A (en) | 2022-03-14 | 2022-03-14 | Cable lead sealing defect depth detection device and method based on multi-frequency eddy current |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114674915A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118010838A (en) * | 2022-11-25 | 2024-05-10 | 国网四川省电力公司电力科学研究院 | High-voltage cable lead sealing defect pulse eddy current detection method, system, terminal and medium |
-
2022
- 2022-03-14 CN CN202210246267.3A patent/CN114674915A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118010838A (en) * | 2022-11-25 | 2024-05-10 | 国网四川省电力公司电力科学研究院 | High-voltage cable lead sealing defect pulse eddy current detection method, system, terminal and medium |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108037181B (en) | Lead sealing eddy current flaw detection device and method for high-voltage cable | |
| CN103353479B (en) | The detection method that a kind of electromagnetic acoustic longitudinal wave guide is compound with Magnetic Flux Leakage Inspecting | |
| CN101666850A (en) | Acoustic-electric detection device for insulation defects of power cable | |
| CN114235962B (en) | Anisotropic structure-oriented ultrasonic guided wave imaging method and system | |
| CN107238610A (en) | Composite insulator defect nondestructive detection system based on microwave band reflection characteristic | |
| CN106950228A (en) | A kind of composite insulator defect non-destructive detecting device | |
| CN106855492A (en) | Mine Dust Concentration dynamic detection system and Dust Concentration dynamic monitoring method | |
| CN114674915A (en) | Cable lead sealing defect depth detection device and method based on multi-frequency eddy current | |
| CN101644745B (en) | Method for dual-frequency ultrasonic detection of defect of generator stator insulator | |
| CN104634873A (en) | Ultrasonic detection system and method for damage of steel wires in bridge-cable anchoring area | |
| CN210376233U (en) | Orthogonal rotation eddy current detection system | |
| CN209841994U (en) | Positioning device for detecting power cable fault and laying route under sea surface | |
| US8677826B2 (en) | Method for evaluating received signals acquired during a non-destructive ultrasonic wave test, and device for non-destructive ultrasonic wave testing of a test body | |
| CN116840346A (en) | Electromagnetic ultrasonic-based overhead transmission line damage detection method | |
| CN1268922C (en) | Electromagnetic guided wave detector and method for sea platform structure defect | |
| CN107462588A (en) | A kind of trees Inner Defect Testing method using GPR as instrument | |
| CN112629617B (en) | Method and system for detecting accumulated water in cable based on magnetostrictive guided waves | |
| CN214895021U (en) | Cable joint lead sealing position pulse eddy current detection device | |
| CN210834768U (en) | Eddy current flaw detection device based on orthogonal detection | |
| CN113884432A (en) | Metal down lead corrosion state detection method based on electromagnetic ultrasonic guided waves | |
| CN107422035A (en) | A kind of carbon fiber composite core wire plug the cannot-harm-detection device and method | |
| CN106918604A (en) | Cable defect detecting system and its detection method based on electromagnetic transmission lineation opinion | |
| CN211922751U (en) | Be used for in-service bridge foundation pile integrality nondestructive test special sensor | |
| CN210534269U (en) | XLPE power cable partial discharge detection system under withstand voltage operating mode of interchange | |
| CN105004788B (en) | Thick-walled pipeline ultrasonic detection device and method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |