CN214150551U - Cable seal lead eddy current testing reference block - Google Patents
Cable seal lead eddy current testing reference block Download PDFInfo
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- CN214150551U CN214150551U CN202022425721.0U CN202022425721U CN214150551U CN 214150551 U CN214150551 U CN 214150551U CN 202022425721 U CN202022425721 U CN 202022425721U CN 214150551 U CN214150551 U CN 214150551U
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Abstract
The utility model relates to a lead eddy current testing of cable seal blocks reference test block, it is the same with its quilt survey cable seal lead that carries out the defect judgement as the contrast in the shape of reference test block and the eddy current testing, prefabricated artificial defect has on the reference test block. The utility model makes up the influence of the shape and curvature difference of the conventional test block on the detection sensitivity; the blank that no suitable reference block exists in the current cable lead sealing joint eddy current testing is filled; and a standard basis is provided for establishing and evaluating the lead sealing quality conformity of the cable. Utilize the utility model discloses a contrast test block and the artificial defect on it adjust and calibrate the sensing test probe that the lead sealing eddy current testing used, can be accurate effectual implementation by the quality evaluation and the health assessment of lead sealing.
Description
Technical Field
The utility model relates to a reference block technical field especially relates to a cable seals plumbous eddy current inspection reference block.
Background
The lead sealing technology of the high-voltage cable accessory is the key of power cable connection. In the cable manufacturing, the lead sealing plays an important role in sealing and waterproofing various terminals and middle connections of the metal lead sheath or aluminum sheath cable, so that a metal outer protective layer of the cable can be connected with other electrical equipment to form a good grounding system; in the construction of various joints of high-voltage cables, the lead sealing technology is a key technology. The lead sealing quality is good, the service life of the cable can be prolonged, and the long-term reliable safe operation of the cable is ensured.
During the manufacturing and using processes of the cable lead sealing, fatigue cracks, tearing and holes can be generated. The fatigue crack and tear are mainly caused by that the lead sealing of the cable joint is stressed and cracked in the radial direction due to geological settlement, mechanical vibration or improper fixation of the joint and the like in the operation process of the lead sealing joint of the cable, and the crack and tear are circumferential defects; the defects of holes are mainly caused by improper process operation in the manufacturing process of the cable lead sealing.
The defects of the lead sealing of the cable can cause moisture to invade, the insulation degree is reduced until the cable breakdown accident happens, and the serious explosion power failure accident and economic loss are caused. Therefore, in the process of evaluating the operation and maintenance quality of the cable, the health evaluation and defect detection of the lead sealing part of the cable accessory are required to be carried out regularly or irregularly, which is an important link for eliminating the hidden trouble of the fault.
Among various detection methods, eddy current detection has high detection sensitivity to defects on the surface or near surface of a workpiece, has good linear display in a certain range, and can evaluate the defects with different sizes. The method can adopt contact detection or non-contact detection (detection with a non-metal coating layer), does not need to adopt a line power-off measure in the detection process, and can be applied to damage assessment and defect detection of cable accessories and components in real time.
The eddy current inspection reference block is a standard basis for establishing quality conformance of inspected products, and usually adopts artificial defects (such as grooves carved on the reference block to simulate crack defects) on the reference block as a basis for judging whether the products are qualified or not through eddy current inspection, and the eddy current inspection reference block is an important basis for defect judgment in the eddy current inspection process.
Fig. 1 is a structural diagram of a conventional reference block 1 ' in the prior art, and as shown in fig. 1, the conventional eddy current testing reference block 1 ' is a rectangular parallelepiped material, and a prefabricated artificial defect such as a notch 11 ' is formed on the rectangular parallelepiped material.
However, the conventional reference block is not suitable for eddy current testing of the lead sealing of the high-voltage cable accessory, because the lead sealing of the high-voltage cable accessory is generally in a hollow tubular shape, the outer surface of the lead sealing of the high-voltage cable accessory has certain curvature in the longitudinal direction and the circumferential direction, and the shape of the lead sealing of the high-voltage cable accessory is greatly different from that of the conventional reference block in a rectangular parallelepiped shape. The difference in shape and surface curvature between the lead sealing and the conventional reference block can cause deviation according to the sensitivity of the detection probe calibrated and adjusted by the reference block in the lead sealing eddy current detection process, so that the quality evaluation of the defects of the lead sealing of the high-voltage cable accessory cannot be accurately carried out in real time.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a cable seals plumbous eddy current testing reference block to solve present conventional reference block and influence the timing of test probe sensitivity when being applied to and seal plumbous eddy current testing, lead to unable accurate effectual sealing plumbous to the high tension cable annex and carry out the technical problem of quality evaluation and health aassessment.
The utility model discloses the technical problem who solves can take following scheme to realize: the utility model provides a cable seals plumbous eddy current testing reference block which characterized in that: the shape of the comparison test block is the same as that of the lead seal of the tested cable which is used as the comparison in the eddy current test, and the comparison test block is provided with prefabricated artificial defects.
Further: the shape of the reference block is in a hollow tubular shape, and the outer edge of the cross section of the reference block at any height is provided with a curve line segment.
Further: the outer edge of the cross section of the reference block at any height is circular.
Further: the outer edge of the longitudinal section of the reference block is also provided with a curve line segment, and the curve line segment of the outer edge of the longitudinal section is bent outwards.
Further: the reference block is made of lead.
Further: the prefabricated artificial defects comprise crack defects of the lead sealing of the tested cable, namely, notches are formed in the comparison test block.
Further: the prefabricated artificial defects further comprise hole defects of lead sealing of the tested cable, namely, flat-bottom holes are formed in the comparison test block.
Further: the length or diameter of the notch groove and the flat bottom hole is not less than 2mm, and the depth is not less than 0.2 mm.
Further: the three grooves are provided, the lengths of the grooves are 20mm, 40mm and 60mm, and the corresponding depths are respectively 1mm, 3mm and 5 mm; the two flat bottom holes are arranged, the diameters of the flat bottom holes are 3mm and 5mm, and the corresponding depths are respectively 2mm and 5 mm.
Further: the surface of the reference block is provided with a non-metallic coating layer.
The utility model discloses a contrast test block and the cable accessories who carries out eddy current testing as the contrast with it seal lead and have the same shape, and prefabricated the artificial defect who simulates the actual defect of sealing lead on this contrast test block. The utility model makes up the influence of the shape and curvature difference of the conventional test block on the detection sensitivity; the blank that no suitable reference block exists in the current cable lead sealing joint eddy current testing is filled; and a standard basis is provided for establishing and evaluating the lead sealing quality conformity of the cable. Utilize the utility model discloses a contrast test block and the artificial defect on it adjust and calibrate the sensing test probe that the lead sealing eddy current testing used, can be accurate effectual implementation by the quality evaluation and the health assessment of lead sealing.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 and FIG. 2 are schematic structural diagrams of a conventional cable lead sealing eddy current testing reference block;
FIG. 3 is a schematic structural diagram of a cable lead sealing eddy current testing reference block according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of the tested cable lead sealing for comparing the test block for eddy current test of cable lead sealing according to the embodiment of the present invention to determine the defects;
FIG. 5 is a schematic diagram of a prefabricated artificial defect on a cable lead sealing eddy current test reference block according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a second cable lead sealing eddy current testing reference block according to an embodiment of the present invention;
FIG. 7 is a schematic structural view of a third embodiment of the present invention of a testing probe for eddy current testing;
main standard parts and labels:
and (3) comparing the test blocks: 1; grooving: 11; flat bottom hole: 12; non-metal coating layer: 13;
and (3) cable lead sealing: 2;
cable corrugated pipe: 3; a corrugated pipe joint: 31.
Detailed Description
In order to clearly show the objects, technical solutions and advantages of the present invention, the following detailed description of the embodiments of the present invention will be further described with reference to the accompanying drawings.
Example one
Fig. 3 is a schematic structural diagram of a cable lead sealing eddy current testing reference block in this embodiment (the prefabricated artificial defect on the reference block is not shown in this figure), and fig. 4 is a schematic structural diagram of a tested cable lead sealing 2 for determining defects by using the reference block in this embodiment as a comparison in an eddy current testing process (the cable lead sealing 2 in this embodiment is formed at a joint of two cable corrugated pipes), that is, when the tested cable lead sealing 2 shown in fig. 4 performs eddy current testing, calibration and adjustment of the sensitivity of a testing probe are performed by using the reference block shown in fig. 3 and the prefabricated artificial defect thereon.
As shown in fig. 3 and 4, the shape of the reference block 1 is completely the same as that of the tested cable lead seal 2, further, the size of each part of the reference block 1 is also completely the same as that of the tested cable lead seal 2, and the curvature of each part of the outer surface of the reference block 1 is completely the same as that of the tested cable lead seal 2. This example has preformed artificial defects on the reference block 1.
Further, in order to adapt to the lead sealing structure of the tested cable, as shown in fig. 3, the shape of the reference block 1 is a hollow tube shape, and the outer edge of the cross section of the reference block 1 at any height has a curve line segment. Further, the outer edge of the cross section of the reference block 1 at any height is circular.
Further, the outer edge of the longitudinal section of the reference block 1 also has a curved line segment, and as shown in fig. 3, the curved line segment of the outer edge of the longitudinal section is curved outward.
Of course, the reference block may have other shapes, as long as the shape is identical to the lead seal of the cable to be tested corresponding to the reference block (which is used as a comparison for calibrating the sensitivity of the test probe) during the eddy current test.
As shown in fig. 5, the prefabricated artificial defects on the reference block of this embodiment include crack defects of the cable lead seal 2 to be tested, that is, the surface of the reference block is provided with the notch 11. Further, in order to simulate the real crack condition of the cable lead seal to be tested during use, the notch 11 in this embodiment extends along the circumferential direction of the reference block.
Further, the prefabricated artificial defects also comprise the hole defects of the lead sealing 2 of the tested cable, namely, the reference block is provided with a flat-bottom hole 12.
The prefabricated artificial defects of the embodiment totally comprise three grooves with different lengths and depths and two flat-bottom holes with different diameters and depths, and the prefabricated artificial defects and the setting of the sizes thereof are shown in the following table 1
TABLE 1 prefabricated artificial defects and their size settings
| Serial number | Defect name | Defect code | Length/diameter (mm) | Depth (mm) |
| 1 | Groove I | C1 | 20 | 1 |
| 2 | Groove II | C2 | 40 | 3 |
| 3 | Groove III | C3 | 60 | 5 |
| 4 | Flat bottom hole I | |
3 | 2 |
| 5 | Flat bottom hole II | P2 | 5 | 5 |
The detection sensitivity of the notch grooves and the flat bottom holes with different sizes on the reference block can be adjusted by adopting a differential bridge type detection probe.
Furthermore, the material of the reference block 1 is the same as the tested cable lead seal 2 for defect determination by comparing the reference block with the tested cable lead seal, and both the reference block and the tested cable lead seal are made of lead in this embodiment. When the sensitivity of the sensing probe for the lead sealing eddy current detection is adjusted by using the reference block, the sensitivity adjustment is also deviated due to the difference between the reference block and the material of the lead sealing to be detected. The traditional conventional reference block does not use lead as a manufacturing material, the material of the reference block is the same as that of the tested lead seal, and the deviation generated during the sensitivity debugging of the detection probe caused by the difference between the reference block and the tested lead seal material can be further eliminated.
Example two
This embodiment is different from the first embodiment only in that the non-metal coating layer 13 is provided on the surface of the comparative block 1 as shown in fig. 6. As shown in fig. 6, the non-metal coating layer covers a part of the outer surface of the reference block 1. The coating layer is arranged, so that sensitivity comparison can be carried out on the non-coating layer region containing the coating layer and the non-coating layer region without the coating layer at the same time during eddy current detection.
EXAMPLE III
As shown in fig. 7, this embodiment is designed to the structure of the differential bridge type detection probe used in the first embodiment, and the detection probe 4 has a concave section 41 on the end side surface. This interior concave section can seal the surface of lead evagination with reference block and quilt in the embodiment one and cooperate, during the detection with this interior concave section and reference block or quilt survey the surface of sealing the lead and laminate mutually to further guarantee to detect the precision.
Furthermore, the curvature of the concave section is the same as the curvature of the surface of the detected section of the detected lead seal, namely the concave section detection probe can be tightly attached to the detected section of the detected lead seal, so that the adjustment and setting accuracy of the detection sensitivity is higher.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The utility model provides a cable seals plumbous eddy current testing reference block which characterized in that: the shape of the comparison test block (1) is the same as that of a tested cable lead seal (2) which is used for comparison in eddy current testing, and the comparison test block (1) is provided with prefabricated artificial defects.
2. The test block of claim 1, wherein: the shape of the reference block (1) is hollow tubular, and the outer edge of the cross section of the reference block (1) at any height is provided with a curve line segment.
3. The test block of claim 2, wherein: the outer edge of the cross section of the reference block (1) at any height is circular.
4. The test block of claim 3, wherein: the outer edge of the longitudinal section of the comparison test block (1) is also provided with a curve line segment, and the curve line segment of the outer edge of the longitudinal section is bent outwards.
5. The test block of claim 1, wherein: the material of the reference block (1) is lead.
6. The test block of claim 1, wherein: the prefabricated artificial defects comprise crack defects of the tested cable lead sealing (2), namely, notches (11) are formed in the comparison test block (1).
7. The test block of claim 6, wherein: the prefabricated artificial defects also comprise hole defects of the tested cable lead sealing (2), namely, flat-bottom holes (12) are formed in the comparison test block.
8. The test block of claim 7, wherein: the length or diameter of the notch groove (11) and the flat bottom hole (12) is not less than 2mm, and the depth is not less than 0.2 mm.
9. The test block of claim 8, wherein: the three notches (11) are arranged, the lengths of the notches (11) are 20mm, 40mm and 60mm, and the corresponding depths are respectively 1mm, 3mm and 5 mm; there are two of the flat bottom holes (12), and the diameter of the flat bottom holes (12) is 3mm, 5mm, the corresponding depth is 2mm, 5mm respectively.
10. The test block of claim 1, wherein: the surface of the reference block (1) is provided with a non-metal coating layer (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022425721.0U CN214150551U (en) | 2020-10-27 | 2020-10-27 | Cable seal lead eddy current testing reference block |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022425721.0U CN214150551U (en) | 2020-10-27 | 2020-10-27 | Cable seal lead eddy current testing reference block |
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| CN214150551U true CN214150551U (en) | 2021-09-07 |
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| CN202022425721.0U Active CN214150551U (en) | 2020-10-27 | 2020-10-27 | Cable seal lead eddy current testing reference block |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110231398A (en) * | 2019-07-16 | 2019-09-13 | 山东电力工业锅炉压力容器检验中心有限公司 | A kind of simulating test pieces for lead sealing Defect With Eddy Current Testing and preparation method thereof and application |
-
2020
- 2020-10-27 CN CN202022425721.0U patent/CN214150551U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110231398A (en) * | 2019-07-16 | 2019-09-13 | 山东电力工业锅炉压力容器检验中心有限公司 | A kind of simulating test pieces for lead sealing Defect With Eddy Current Testing and preparation method thereof and application |
| CN110231398B (en) * | 2019-07-16 | 2023-01-31 | 山东电力工业锅炉压力容器检验中心有限公司 | Simulation test block for detecting defects of lead-sealed eddy current test and manufacturing method and application thereof |
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