CN113109432A - Pulse eddy current detection device for lead sealing part of cable connector and application method thereof - Google Patents
Pulse eddy current detection device for lead sealing part of cable connector and application method thereof Download PDFInfo
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Abstract
The invention discloses a pulse eddy current detection device for a lead sealing part of a cable joint and an application method thereof, and the device comprises a signal generator, an eddy current detection probe, a data acquisition and processing module and a control module, wherein the control end of the signal generator is connected with the control module; the application method of the device comprises the steps of realizing omnibearing pulse eddy current detection on the lead sealing part of the cable joint through two movement directions of the annular direction and the longitudinal direction, and taking the amplitude variation of the induction voltage as the judgment reference of the crack. The invention can realize the surface and near surface defect detection of the lead sealing part of the high-voltage cable joint, has the characteristics of higher detection accuracy, sensitivity, stronger anti-interference capability, small volume, convenient operation and the like, and is particularly suitable for realizing the crack safety hidden danger with good appearance of the cable joint.
Description
Technical Field
The invention relates to the technical field of cable nondestructive inspection of a power system, in particular to a pulse eddy current detection device for a lead sealing part of a cable joint and an application method thereof.
Background
The lead seal is one of key processes for manufacturing the high-voltage cable accessory, once the lead seal is cracked due to unqualified installation quality or factors such as pulling force, vibration and the like in operation, the accessory is easy to be affected with water and damp or has poor electrical connection, and therefore fault tripping of a high-voltage cable line is caused. At present, researches on a lead sealing state detection technology of a high-voltage cable are few, the lead sealing construction quality cannot be directly detected after accessories are manufactured, the lead sealing state cannot be detected in the operation process, and lead sealing defect detection becomes a difficult problem which puzzles the safe operation of the high-voltage cable. For in-service detection of defects under such an insulating layer at a lead sealing part of a high-voltage cable connector, a conventional nondestructive detection method has many limitations and is difficult to realize a detection target. Although the Digital Radiography (DR) technique can detect some defects (thinning and cracking), it has high detection cost and low operation efficiency, and most of all, it has great disadvantages in terms of environmental pollution and operator protection.
The eddy current detection is a nondestructive detection method suitable for the type defects of corrosion, cracking, holes and the like on the surface and near surface of a metal conductor material, is widely applied in detection practice and has higher detection sensitivity. In the traditional eddy current detection, alternating current is usually loaded on an exciting coil, when a detection coil is close to a tested piece, magnetic lines of force generated by the exciting coil can be cut on the surface of a conductor, a rapidly attenuated reverse eddy current is generated on the conductor test piece immediately, a secondary magnetic field generated by the eddy current can change the impedance of a receiving element, and the integrity of the tested piece can be judged by observing the impedance change of the detection coil.
Although the traditional eddy current detection method can realize the nondestructive detection of the surface and near-surface defects of the metal conductor material, the traditional eddy current detection technology is greatly limited by the thickness of the external insulating layer of the metal conductor material due to the existence of the lift-off effect, and when a thicker insulating layer exists, the traditional eddy current detection precision often cannot meet the requirement.
The invention discloses a high-voltage cable lead-sealed eddy current flaw detection device and a method, and relates to a high-voltage cable lead-sealed eddy current flaw detection technology in the prior art, the device adopts a traditional eddy current detection method, has better identification degree aiming at crack defects with the same ratio of more than 5mm, can basically realize the detection of the crack defects with the thickness of 1mm and more, and particularly the cracks with the thickness of 5mm are at risk or can be called as broken, and in the actual production, the defects have no need of detection, or have been broken, or can be judged by external serious deformation. For a cable joint with a perfect appearance, if potential safety hazards such as cracks exist, the width of the cracks is usually less than 1.0mm, and is usually 0.1-0.8 mm in most cases. For the tiny defects, the traditional eddy current detection technology cannot achieve the detection target.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the invention can realize the surface and near-surface defect detection of the lead sealing part of the high-voltage cable connector, has the characteristics of higher detection accuracy, higher sensitivity, stronger anti-interference capability, small volume, convenient operation and the like, and is particularly suitable for realizing the crack safety hidden danger with good appearance existing in the cable connector.
In order to solve the technical problems, the invention adopts the technical scheme that:
the utility model provides a cable joint lead sealing position pulse eddy current testing device, includes signal generator, eddy current test probe, data acquisition and processing module and control module, signal generator's control end links to each other with control module, be equipped with exciting coil and detection coil in the eddy current test probe, signal generator's output links to each other with exciting coil, the output of detection coil passes through data acquisition and processing module and links to each other with control module.
Optionally, both the excitation coil and the detection coil are arranged coaxially.
Optionally, the excitation coil and the detection coil are both tubular structures with inner holes, and the excitation coil is inserted and arranged in the inner holes of the detection coil.
Optionally, a cylindrical magnetic core is inserted into an inner hole of the excitation coil, and the detection coil, the excitation coil and the cylindrical magnetic core are coaxially arranged.
Optionally, the height of the detection coil is higher than that of the excitation coil, the wire diameter of the detection coil is 0.2-0.4 mm, and the number of turns is 80-160; the wire diameter of the exciting coil is 0.4-0.6 mm, and the number of turns is 40-80.
Optionally, the cylindrical magnetic core is made of permalloy material.
Optionally, the data acquisition and processing module includes a pre-gain circuit, a phase-sensitive detection circuit and a rectification filter circuit, the pre-gain circuit, the phase-sensitive detection circuit and the rectification filter circuit are connected in sequence, the input end of the pre-gain circuit is connected with the output end of the detection coil, and the output end of the rectification filter circuit is connected with the control module.
Optionally, the signal generator is a direct current square wave signal generator.
Optionally, the duty ratio of the direct-current square wave signal generated by the direct-current square wave signal generator is 50%, the frequency range is 4-32 Hz, and the current range is 3-6A.
Optionally, the control module is a portable computer device with a display module.
In addition, the invention also provides an application method of the pulse eddy current detection device for the lead sealing part of the cable joint, which comprises the following steps:
1) the starting signal generator outputs an excitation signal to an excitation coil of the eddy current detection probe,
2) the eddy current detection probe is tightly attached to the outer wall of the lead sealing part of the cable joint to move along the annular direction, the amplitude of the induction voltage output by the detection coil is acquired through the data acquisition and processing module, the amplitude variation of the induction voltage is calculated, and if the amplitude variation of the induction voltage exceeds a preset threshold, a crack is determined to be found;
3) the eddy current detection probe is attached to the outer wall of the lead sealing part of the cable joint to move longitudinally, the amplitude of the induction voltage output by the detection coil is acquired through the data acquisition and processing module, the amplitude variation of the induction voltage is calculated, and if the amplitude variation of the induction voltage exceeds a preset threshold, the crack is determined to be found.
Compared with the prior art, the pulse eddy current detection device for the lead sealing part of the cable joint has the following advantages: the eddy current detection device comprises a signal generator, an eddy current detection probe, a data acquisition and processing module and a control module, wherein the control end of the signal generator is connected with the control module, an excitation coil and a detection coil are arranged in the eddy current detection probe, the output end of the signal generator is connected with the excitation coil, and the output end of the detection coil is connected with the control module through the data acquisition and processing module. The invention can realize the surface and near surface defect detection of the lead sealing part of the high-voltage cable joint, has the characteristics of higher detection accuracy, sensitivity, stronger anti-interference capability, small volume, convenient operation and the like, and is particularly suitable for realizing the crack safety hidden danger with good appearance of the cable joint. The eddy current detection probe is provided with the excitation coil and the detection coil, and the excitation coil and the detection coil are designed by adopting an integrated probe, so that the detection sensitivity of the detection coil can be effectively improved.
The application method of the pulse eddy current detection device for the lead sealing part of the cable joint comprises the steps that an eddy current detection probe moves along the annular direction in a mode that the eddy current detection probe is tightly attached to the outer wall of the lead sealing part of the cable joint, the amplitude of induction voltage output by a detection coil is collected through a data collection and processing module, the amplitude variation of the induction voltage is calculated, and if the amplitude variation of the induction voltage exceeds a preset threshold value, a crack is determined to be found; the eddy current detection probe is attached to the outer wall of the lead sealing part of the cable joint and moves along the longitudinal direction, the amplitude of the induction voltage output by the detection coil is acquired through the data acquisition and processing module, the amplitude variation of the induction voltage is calculated, if the amplitude variation of the induction voltage exceeds a preset threshold value, a crack is determined to be found, and the omnibearing pulse eddy current detection of the lead sealing part of the cable joint can be realized through two movement directions, namely the annular direction and the longitudinal direction; the amplitude variation of the induction voltage is used as a judgment reference of the cracks, so that the potential safety hazards of 0.1-0.8 mm cracks can be accurately detected.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
FIG. 2 is a schematic structural diagram of an eddy current inspection probe according to an embodiment of the present invention.
FIG. 3 is a schematic sectional view of an applied state of an eddy current inspection probe according to an embodiment of the present invention.
FIG. 4 is a schematic diagram illustrating an application of the eddy current testing probe according to an embodiment of the present invention.
Detailed Description
As shown in fig. 1, the pulsed eddy current testing apparatus for the lead sealing portion of the cable joint in the present embodiment includes a signal generator 1, an eddy current testing probe 2, a data acquisition and processing module 3 and a control module 4, a control end of the signal generator 1 is connected with the control module 4, an excitation coil and a detection coil are disposed in the eddy current testing probe 2, an output end of the signal generator 1 is connected with the excitation coil, and an output end of the detection coil is connected with the control module 4 through the data acquisition and processing module 3. The cable joint lead seal position pulse eddy current detection device can realize surface and near surface defect detection of a high-voltage cable joint lead seal position, has the characteristics of high detection accuracy, sensitivity and strong anti-interference capability, small size, convenience in operation and the like, is particularly applicable to crack safety hazards with good appearance in the cable joint, and can effectively improve the detection sensitivity of a detection coil by adopting integrated probe design for both an excitation coil and the detection coil.
As shown in fig. 2 and 3, in the present embodiment, the excitation coil (as indicated by reference sign b in fig. 2 and 3) and the detection coil (as indicated by reference sign a in fig. 2 and 3) are coaxially arranged, and the detection sensitivity of the detection coil can be further improved.
As shown in fig. 2 and 3, in the present embodiment, each of the excitation coil and the detection coil is a tubular structure having an inner hole, and the excitation coil is inserted and arranged in the inner hole of the detection coil.
As shown in fig. 2 and 3, in the present embodiment, a cylindrical magnetic core (as indicated by reference sign c in fig. 2 and 3) is inserted into the inner hole of the excitation coil, and the detection coil, the excitation coil, and the cylindrical magnetic core are coaxially arranged, so that the cylindrical magnetic core can enhance both the excitation coil and the detection coil, thereby improving the detection sensitivity of the detection coil.
As shown in fig. 2 and 3, in the present embodiment, the height of the detection coil is higher than that of the excitation coil, and the wire diameter of the detection coil is 0.2 to 0.4mm, and the number of turns is 80 to 160; the linear diameter of the exciting coil is 0.4-0.6 mm, the number of turns is 40-80, and the detection sensitivity of the detection coil can be improved.
In the embodiment, the cylindrical magnetic core is made of permalloy materials, so that the magnetic gathering capacity of the probe can be effectively improved, and the excitation magnetic field is effectively increased.
As shown in fig. 1, the data acquisition and processing module 3 includes a pre-gain circuit 31, a phase-sensitive detection circuit 32 and a rectification filter circuit 33, the pre-gain circuit 31, the phase-sensitive detection circuit 32 and the rectification filter circuit 33 are connected in sequence, an input end of the pre-gain circuit 31 is connected to an output end of the detection coil, and an output end of the rectification filter circuit 33 is connected to the control module 4. The pre-amplification is carried out through the pre-gain circuit 31, and then the phase-sensitive detection is carried out through the phase-sensitive detection circuit 32, so that the influence of the magnetic flux leakage at the defect position on the detection result can be effectively reduced, and the detection of the potential safety hazards of 0.1-0.8 mm cracks can be effectively realized by combining the design of the eddy current detection probe 2.
In this embodiment, the signal generator 1 is a dc square wave signal generator, the dc square wave signal generator generates a dc square wave signal, the dc square wave signal is input to an excitation coil in the eddy current detection probe 2, a generated primary transient magnetic field passes through an insulating layer outside a lead seal portion of the cable joint and is conducted to a lead seal layer inside the lead seal portion of the cable joint, a rapidly changing reverse current is generated at the moment when a phase of the dc square wave signal changes, an attenuated secondary magnetic field is induced in the lead seal layer, a voltage signal is obtained by detection of the detection coil, and a defect condition of the lead seal layer can be detected by an amplitude change of the voltage signal in the detection coil. Compared with the traditional eddy current (ET) method, the pulse eddy current signal has stronger penetrating power and allows certain lift-off height during detection, so that the method is more suitable for detecting metal test pieces with isolated areas, such as anti-corrosion covering layers and the like.
In the embodiment, the duty ratio of the direct-current square wave signal generated by the direct-current square wave signal generator is 50%, the frequency range is 4-32 Hz, and the current range is 3-6A, so that the direct-current square wave signal generator is suitable for realizing the crack potential safety hazard with a good appearance in a cable joint.
In this embodiment, the control module 4 is a portable computer device with a display module, specifically a notebook computer, and other types of portable computer devices with a display module may also be used as needed. The control module 4 is connected with the data acquisition and processing module 3 and can calculate and store the detection result; the control module 4 is connected with the control end of the signal generator 1, and can adjust parameters such as square wave pulse duty ratio, signal frequency and signal gain.
In addition, the embodiment further provides an application method of the pulse eddy current testing device for the lead sealing part of the cable joint, which includes:
1) the turn-on signal generator 1 outputs an excitation signal to the excitation coil of the eddy current inspection probe 2,
2) moving an eddy current detection probe 2 close to the outer wall of the lead sealing part of the cable joint along the annular direction (the direction of A-B in figure 4), acquiring the amplitude of the induction voltage output by the detection coil through a data acquisition and processing module 3, calculating the amplitude variation of the induction voltage, and judging that a crack is found if the amplitude variation of the induction voltage exceeds a preset threshold value (shown as d in figure 4);
3) the eddy current detection probe 2 is tightly attached to the outer wall of the lead sealing part of the cable joint to move along the longitudinal direction (C-D direction in figure 4), the amplitude of the induction voltage output by the detection coil is collected through the data collection and processing module 3, the amplitude variation of the induction voltage is calculated, and if the amplitude variation of the induction voltage exceeds a preset threshold value, a crack is determined to be found.
The application method of the pulse eddy current detection device for the lead sealing part of the cable joint in the embodiment can realize the omnibearing pulse eddy current detection of the lead sealing part of the cable joint through the two movement directions of the annular direction and the longitudinal direction; the amplitude variation of the induction voltage is used as a judgment reference of the cracks, so that the potential safety hazards of 0.1-0.8 mm cracks can be accurately detected.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (10)
1. The utility model provides a cable joint lead sealing position pulse eddy current testing device, its characterized in that, includes signal generator (1), eddy current detection probe (2), data acquisition and processing module (3) and control module (4), the control end of signal generator (1) links to each other with control module (4), be equipped with exciting coil and detection coil in eddy current detection probe (2), the output of signal generator (1) links to each other with exciting coil, the output of detection coil passes through data acquisition and processing module (3) and links to each other with control module (4).
2. The cable joint lead seal portion pulsed eddy current testing device according to claim 1, wherein the excitation coil and the detection coil are both coaxially arranged.
3. The device for detecting the pulsed eddy current at the lead sealing part of the cable joint as claimed in claim 2, wherein the excitation coil and the detection coil are both tubular structures with inner holes, and the excitation coil is inserted and arranged in the inner hole of the detection coil.
4. The pulsed eddy current testing device for lead sealing part of cable joint as claimed in claim 3, wherein the cylindrical magnetic core is inserted into the inner hole of said exciting coil, and the detecting coil, the exciting coil and the cylindrical magnetic core are coaxially arranged.
5. The device for detecting the pulse eddy current at the lead sealing part of the cable joint according to claim 4, wherein the height of the detection coil is higher than that of the excitation coil, and the wire diameter of the detection coil is 0.2-0.4 mm, and the number of turns is 80-160; the wire diameter of the exciting coil is 0.4-0.6 mm, and the number of turns is 40-80.
6. The pulsed eddy current inspection device for lead sealing portion of cable joint as claimed in claim 5, wherein said cylindrical magnetic core is made of permalloy material.
7. The cable joint lead sealing part pulse eddy current testing device according to claim 1, wherein the data acquisition and processing module (3) comprises a pre-gain circuit (31), a phase-sensitive detection circuit (32) and a rectification filter circuit (33), the pre-gain circuit (31), the phase-sensitive detection circuit (32) and the rectification filter circuit (33) are connected in sequence, the input end of the pre-gain circuit (31) is connected with the output end of the detection coil, and the output end of the rectification filter circuit (33) is connected with the control module (4).
8. The cable joint lead sealing part pulse eddy current testing device according to claim 1, characterized in that the signal generator (1) is a direct current square wave signal generator.
9. The pulsed eddy current inspection device for the lead sealing part of the cable joint as claimed in claim 8, wherein the duty ratio of the dc square wave signal generated by the dc square wave signal generator is 50%, the frequency range is 4-32 Hz, and the current range is 3-6A.
10. The method for applying the pulsed eddy current testing device for the lead sealing part of the cable joint according to any one of claims 1 to 9, is characterized by comprising the following steps:
1) the starting signal generator (1) outputs an excitation signal to an excitation coil of the eddy current detection probe (2),
2) the eddy current detection probe (2) is tightly attached to the outer wall of the lead sealing part of the cable joint to move along the annular direction, the amplitude of the induction voltage output by the detection coil is collected through the data collection and processing module (3), the amplitude variation of the induction voltage is calculated, and if the amplitude variation of the induction voltage exceeds a preset threshold value, a crack is determined to be found;
3) the eddy current detection probe (2) is attached to the outer wall of the lead sealing part of the cable joint to move longitudinally, the amplitude of the induction voltage output by the detection coil is collected through the data collection and processing module (3), the amplitude variation of the induction voltage is calculated, and if the amplitude variation of the induction voltage exceeds a preset threshold, a crack is determined to be found.
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| CN202110571211.0A CN113109432A (en) | 2021-05-25 | 2021-05-25 | Pulse eddy current detection device for lead sealing part of cable connector and application method thereof |
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| CN113418984A (en) * | 2021-08-05 | 2021-09-21 | 重庆大学 | Become oar bearing high strength steel crack detecting system |
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| CN118010843A (en) * | 2024-04-07 | 2024-05-10 | 上海纪岩电力科技有限公司 | High-voltage cable lead sealing eddy current flaw detection method and system |
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