CN111426608B - Testing arrangement is collected in migration of crosslinked polyethylene insulated cable accessory substance - Google Patents
Testing arrangement is collected in migration of crosslinked polyethylene insulated cable accessory substance Download PDFInfo
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- CN111426608B CN111426608B CN202010240370.8A CN202010240370A CN111426608B CN 111426608 B CN111426608 B CN 111426608B CN 202010240370 A CN202010240370 A CN 202010240370A CN 111426608 B CN111426608 B CN 111426608B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
- G01N2013/003—Diffusion; diffusivity between liquids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N2015/0007—Investigating dispersion of gas
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- Testing Relating To Insulation (AREA)
Abstract
A test device is collected in migration of crosslinked polyethylene insulated cable accessory substance, includes: a temperature detecting part and a pressure detecting part connected with the byproduct migration collecting part; the byproduct migration collecting member includes: the supporting cover plate and the sealing cover plate are connected through an adjusting bolt; the adjusting bolt is connected with the supporting cover plate through a semi-through threaded hole; the adjusting bolt is connected with the sealing cover plate through a full-through threaded hole. The method is directly applied to the detection of the coaxial wire core of the XLPE insulated cable, so that the process of completing the test by using a flat plate sample and then performing the equivalence to the actual cable structure in the traditional method is saved, the efficiency is improved, and the result error caused by the inaccuracy of the equivalence process is avoided.
Description
Technical Field
The invention relates to a technology in the field of power cable performance testing, in particular to a migration, collection and testing device for byproducts of a cross-linked polyethylene (XLPE) insulated cable.
Background
The XLPE insulated cable has the characteristics of environmental friendliness, high operating temperature and large conveying capacity, has obvious advantages compared with the traditional oil-filled cable and the traditional oil-paper insulated cable, and plays a key role in electric power construction at home and abroad. In industrial application, the insulating layer of the XLPE insulated cable is made of linear low-density polyethylene (LDPE), wherein a certain amount of dicumyl peroxide (DCP) is added as a cross-linking agent in proportion, and the DCP is decomposed at a certain temperature to induce the linear LDPE molecules to perform a cross-linking reaction, so that the XLPE with a mesh-shaped macromolecular structure is converted. In addition to the functional groups that promote the conversion of LDPE to XLPE, DCP generates a series of by-products during thermal decomposition, which remain in XLPE mainly in the form of small molecules and have various negative effects on the electrical properties of XLPE, so as to minimize the residual amount of the by-products in the XLPE insulation. The removal effects of the byproducts under different cable lengths, cable specifications and insulation thicknesses are different, and more comprehensive and accurate residual byproduct collection and testing methods need to be matched for deep research, so that the migration rules of different byproducts in XLPE are obtained, and the optimization of a degassing method in industrial production is guided. In the prior art, most of the migration and collection tests of byproducts are carried out based on sheet-shaped samples, XLPE sample sheets are obtained by cross-linking after LDPE material pressing, or sample sheets are cut from processed XLPE cables, the method cannot accurately simulate the migration process of the byproducts in the cables with coaxial structures, and errors are brought to the test analysis of the quality, concentration and migration coefficient of the subsequent byproducts.
Since the byproducts have many negative effects on the electrical performance of XLPE, much research has been devoted to finding ways to rapidly eliminate the byproducts in XLPE, or to find ways to reduce the byproducts as quickly as possible and how the byproducts are reduced depends on which factors. The research and detection of the by-products of the existing XLPE insulated cable, especially the high voltage DC cable, in the research and development and batch application process are only carried out on the sheet sample, because the slicing is the most convenient method for obtaining the XPE sample, but also faces larger disadvantages, mainly because the by-products exist in small molecules in the XLPE, under the influence of external temperature and air components, the small molecules of the by-products can diffuse from the position with large concentration to the position with small concentration and the air outside the XLPE, but the specific surface area of the sheet sample is overlarge, and the diffusion direction of the by-products in the sheet sample is only vertical to the surface of the sheet, so the obtained research result can only obtain approximate theoretical rules, the XLPE insulated cable insulation structure really applied in engineering is a hollow cylindrical structure, and the diffusion direction of the by-products in the hollow cylindrical structure comprises a direction which is outward along the radial direction, The cylindrical insulating structure can truly reflect the temperature gradient of the cable body along different directions such as radial inward diffusion and axial diffusion, and the factors have important influence on the research on the true diffusion rule of the byproducts in the true cable, so that a device capable of truly simulating the diffusion process of the byproducts in the true cable is needed to be developed to assist in researching related problems.
The invention provides a device for collecting and testing migration of byproducts of a cross-linked polyethylene (XLPE) insulated cable, aiming at the defects in the prior art, and the device can fix and seal an insulated wire core and promote the migration of the byproducts from an insulated inner layer to the outside along the radial direction.
The invention is realized by the following technical scheme:
the invention comprises the following steps: a temperature detecting part and a pressure detecting part connected to the byproduct migration collecting part, wherein: the byproduct migration collecting member includes: the supporting cover plate and the sealing cover plate are connected through an adjusting bolt; the temperature detection part includes: the thermocouple enters the inside of the insulated wire core through a hole in the sealing bolt and is immersed in a byproduct solution at the hollow part of the insulated wire core, and the lead-out wire transmits a temperature signal monitored by the thermocouple to the temperature reading device and monitors the internal temperature; the pressure detecting part includes: the pressure sensor penetrates through the sealing bolt through the outgoing line and is arranged on the inner surface of the sealing bolt, and the pressure sensor transmits monitored pressure variation information to the pressure reading device through the outgoing line.
The adjusting bolt is connected with the supporting cover plate through a semi-permeable threaded hole.
The adjusting bolt is connected with the sealing cover plate through a full-through threaded hole.
The supporting cover plate and the sealing cover plate are respectively provided with two sealing gaskets in the direction of contacting with the insulated wire core.
The sealing washer of the sealing cover plate is provided with a through threaded hole and a sealing bolt.
Technical effects
The invention solves the technical problems that the prior art is finished based on XLPE slices, the specific surface area of a sheet sample is overlarge, and the diffusion direction of byproducts in the sheet sample is only vertical to the surface of a sheet, and by using a simulation device with completely the same diffusion characteristics as the byproducts of a real cable, the distribution of the byproducts with different concentrations is obtained simultaneously in the radial direction of an insulated wire core, thereby avoiding the process of preparing samples by adjusting the concentrations of the byproducts or processing time for many times in the conventional slicing test, obtaining the diffusion migration rule of the byproducts which is completely the same as the real cable applied in engineering, and providing a more reliable method and data for related research.
Compared with the prior art, the method is directly applied to the detection of the coaxial wire core of the XLPE insulated cable, the process that the test is completed by using the flat plate sample and then the equivalent is carried out to the actual cable structure in the traditional method is saved, the efficiency is improved, and the result error caused by the inaccuracy of the equivalent process is avoided.
Description of the drawings fig. 1 is a schematic structural view of the present invention;
FIG. 2 is a by-product migration collection member;
FIG. 3 is a schematic structural view of a support cover plate;
FIG. 4 is a top view of the sealing cover plate;
FIG. 5 is a side view of the sealing cover plate;
FIG. 6 is a schematic view of the adjusting bolt;
FIG. 7 is a schematic structural view of a seal bolt;
FIG. 8 is a schematic view of a support deck;
FIG. 9 is a schematic view of a sealing cover plate;
in the figure: the device comprises a byproduct migration and collection part 1, a temperature detection part 2, a pressure detection part 3, a supporting cover plate 4, a sealing cover plate 5, an adjusting bolt 6, a screw hole 7, a sealing washer 8, a threaded hole 9, a sealing bolt 10, a nut 11, an insulating wire core 12, a semi-permeable threaded hole 13, a sealing channel 14 and a full-permeable threaded hole 15.
The specific implementation mode is as follows: example 1
As shown in fig. 1, the present embodiment includes: a temperature detecting part 2 and a pressure detecting part 3 connected to the byproduct migration collecting part 1.
As shown in fig. 2, the byproduct migration collecting member 1 includes: support apron 4, sealed apron 5 and three adjusting bolt 6, wherein: support apron 4 and sealed apron 5 and be connected through three adjusting bolt 6, three adjusting bolt 6 equipartitions are in sealed apron 5 and the screw 7 on the circumference of supporting apron 4.
As shown in fig. 3, the diameter of the supporting cover plate 4 is 200mm, the height is 20mm, the screw hole is a semi-through threaded hole, the diameter of the semi-through threaded hole is 15mm, the distance between the center of the semi-through threaded hole and the edge of the supporting cover plate 4 is 20mm, and the depth of the screw hole 7 is 10 mm.
As shown in fig. 4, the sealing cover plate 5 has the same size as the supporting cover plate 4, and the screw holes are full-through screw holes 15.
As shown in fig. 2 and 5, two sealing gaskets 8 are coaxially arranged in the centers of the supporting cover plate 4 and the sealing cover plate 5 to form a convex shape.
The specifications of the two sealing gaskets 8 of the supporting cover plate 4 are respectively 80 multiplied by 5mm and 20 multiplied by 5 mm.
The sealing washer 8 of the sealing cover plate 5 is provided with a through threaded hole 9 and a sealing bolt 10.
The sealing bolt 10 is a structure integrating a bolt and a nut, the outer diameter of the bolt is 10mm, and the nut is a hexagonal nut with the inner circle diameter of 15 mm.
As shown in fig. 6, the adjusting bolt 6 has a single-end thread structure, the length of the adjusting bolt is 300mm, the outer diameter of the adjusting bolt is 15mm, the length of the adjusting bolt is 280mm, and scales are arranged every 10mm from the starting end of the adjusting bolt.
As shown in fig. 7, the adjusting bolt 6 is provided with a hexagonal nut 11, and the inner diameter of the thread of the nut 11 is 15mm and the diameter of the inscribed circle thereof is 20 mm.
The temperature detection unit 2 includes: thermocouple, lead-out wire and temperature reading device, wherein: the thermocouple enters the inside of the insulated wire core 12 through the hole on the sealing bolt 10 and is immersed in the byproduct solution at the hollow part of the insulated wire core 12, and the lead-out wire transmits the temperature signal monitored by the thermocouple to the temperature reading device and monitors the internal temperature.
The pressure detecting part 3 includes: pressure sensor, lead-out wire and pressure reading device, wherein: the pressure sensor passes through the sealing bolt 10 through the lead wire and is disposed on the inner surface thereof, and the pressure sensor transmits the monitored pressure variation information to the pressure reading device through the lead wire.
The sealing washer 8 is made of polytetrafluoroethylene.
Under the temperature condition of 60-70 ℃, by the combination mode of the embodiment 1, after 72 hours, a preparation result of byproducts with obvious distribution can be obtained in a cylindrical insulated wire core sample, and the distribution is reduced in an approximately linear gradient from the inner layer to the outer layer.
Example 2
Compared with embodiment 1, the by-product migration collecting member of the present embodiment includes: support apron, sealed apron and an adjusting bolt, wherein: the center of the supporting cover plate is connected with the center of the sealing cover plate through an adjusting bolt. The supporting cover plate is shown in fig. 8, and the sealing cover plate is shown in fig. 9.
The joint of the adjusting bolt and the supporting cover plate is a semi-through threaded hole.
The joint of the adjusting bolt and the sealing cover plate is a full through threaded hole.
And sealing gaskets are arranged in the contact directions of the supporting cover plate and the sealing cover plate and the insulating wire core 12.
And sealing channels 14 are arranged on two sides of the threaded hole of the sealing cover plate so as to facilitate the temperature detection part and the pressure detection part to pass through.
The device of the present embodiment works by: after one end of the adjusting bolt is screwed into the screw hole, the hollow part of the insulated wire core 12 is sleeved in the adjusting bolt and is arranged on the supporting cover plate, and the other end of the adjusting bolt is matched with the screw hole of the sealing cover plate.
Compared with the prior art, the invention has the advantages that: the invention can reduce the sample preparation times required to be completed for acquiring comprehensive data on the existing basis.
For a cable with the insulation thickness of t (unit is mm), based on the embodiment, the preparation of a byproduct distribution sample under the whole insulation thickness can be completed at one time, namely, t research objects with the thickness of 1.0mm can be obtained by the method after treatment for the same time under the specified type and temperature of the byproduct, the traditional slicing research method needs to distribute and carry out 1.0mm sample preparation and treatment for t times, regular byproduct concentration distribution cannot be obtained in the treated sample, and the result similar to the method can be obtained by adjusting the byproduct treatment time for multiple times, so the method can greatly improve the sample preparation efficiency and the sample effect.
The foregoing embodiments may be modified in many different ways by those skilled in the art without departing from the spirit and scope of the invention, which is defined by the appended claims and all changes that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (5)
1. A device for collecting and testing migration of byproducts of a crosslinked polyethylene insulated cable, comprising: a temperature detecting part and a pressure detecting part connected with the byproduct migration collecting part;
the temperature detection part comprises: a thermocouple and a temperature reading device, wherein: the thermocouple enters the inside of the insulated wire core through the sealing cover plate and is immersed in a byproduct solution at the hollow part of the insulated wire core, and a temperature signal monitored by the thermocouple is transmitted to the temperature reading device through the outgoing line;
the pressure detecting part comprises: a pressure sensor and a pressure reading device, wherein: the pressure sensor penetrates through the sealing cover plate through the outgoing line and is arranged on the inner surface of the sealing cover plate, and the pressure sensor transmits the monitored pressure variation information to the pressure reading device through the outgoing line;
the byproduct migration collecting member includes: the supporting cover plate and the sealing cover plate are connected through an adjusting bolt;
the adjusting bolt is connected with the supporting cover plate through a semi-through threaded hole; the adjusting bolt is connected with the sealing cover plate through a full-through threaded hole.
2. The apparatus for testing migration and collection of byproducts of crosslinked polyethylene insulated cables as claimed in claim 1, wherein the supporting cover plate and the sealing cover plate are respectively provided with two sealing washers in a direction contacting the insulated wire core to form a convex shape.
3. The apparatus for testing migration and collection of byproducts in crosslinked polyethylene insulated cables as claimed in claim 2, wherein the sealing washer of the sealing cover plate is provided with a through threaded hole and a sealing bolt.
4. The apparatus for testing migration of byproducts in insulated crosslinked polyethylene cables as claimed in claim 1, wherein said adjusting bolt is a single-end threaded structure.
5. The device for testing migration of byproducts in the insulated crosslinked polyethylene cables as claimed in any one of claims 1 to 3, wherein the adjusting bolt is provided with a hexagonal nut.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010240370.8A CN111426608B (en) | 2020-03-31 | 2020-03-31 | Testing arrangement is collected in migration of crosslinked polyethylene insulated cable accessory substance |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010240370.8A CN111426608B (en) | 2020-03-31 | 2020-03-31 | Testing arrangement is collected in migration of crosslinked polyethylene insulated cable accessory substance |
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| CN111426608A CN111426608A (en) | 2020-07-17 |
| CN111426608B true CN111426608B (en) | 2021-05-25 |
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Citations (2)
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| CN101408493A (en) * | 2008-11-24 | 2009-04-15 | 中国科学院武汉岩土力学研究所 | Method and apparatus for measuring adsorbance-deformation-permeability coefficients of material |
| CN201628666U (en) * | 2010-04-13 | 2010-11-10 | 济南兰光机电技术有限公司 | Infiltration pond constant temperature control device |
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| CA2593139A1 (en) * | 2007-07-05 | 2009-01-05 | Kaiser Optical Systems | Measurement and control by solid and gas phase raman spectroscopy of manufacturing processes for chemically crosslinked polyethylene for insulated electric cables and for other products |
| CN201622227U (en) * | 2009-11-19 | 2010-11-03 | 福建出入境检验检疫局检验检疫技术中心 | Analog migration testing tank for food contact material |
| ES2714526T3 (en) * | 2013-10-23 | 2019-05-28 | Prysmian Spa | Power transport cable with an electrically insulated crosslinked layer, and process for the extraction of crosslinked byproducts of this |
| CN104698298A (en) * | 2015-02-15 | 2015-06-10 | 宁波球冠电缆股份有限公司 | High-voltage DC cross-linked polyethylene insulating degassing effect detection method |
| RU2704009C2 (en) * | 2015-04-22 | 2019-10-23 | Призмиан С.П.А. | Power cable with system of cross-linked electrical insulation and method for production thereof with extraction of by-products of stitching |
| CN205506639U (en) * | 2016-04-08 | 2016-08-24 | 中国地质大学（武汉） | Low permeability ground diffusion coefficient apparatus |
| CN108593791A (en) * | 2018-04-11 | 2018-09-28 | 广州岭南电缆股份有限公司 | A kind of detection method of cross-linked cable insulation core by-product |
| CN109813645B (en) * | 2019-03-19 | 2021-07-02 | 苏州开洛泰克科学仪器科技有限公司 | System and method for measuring radial permeability of core plunger of low-permeability rock ore |
| CN110231270A (en) * | 2019-06-05 | 2019-09-13 | 东南大学 | A kind of concrete gas radial penetration performance test device and method |
| CN110726648B (en) * | 2019-10-25 | 2022-04-29 | 中国烟草总公司郑州烟草研究院 | Method for characterizing diffusion rate of glycerol solution system in tobacco sheet |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101408493A (en) * | 2008-11-24 | 2009-04-15 | 中国科学院武汉岩土力学研究所 | Method and apparatus for measuring adsorbance-deformation-permeability coefficients of material |
| CN201628666U (en) * | 2010-04-13 | 2010-11-10 | 济南兰光机电技术有限公司 | Infiltration pond constant temperature control device |
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