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1.发明公开
公开(公告)号：EP4246136A1
公开(公告)日：2023-09-20
申请号：EP21890918.2
申请日：2021-10-21
发明人： LI, Xiaolin , FU, Mingli , HOU, Shuai , HUI, Baojun , ZHU, Wenbo , WU, Guoxing , XIE, Hong , CHEN, Xiao , XU, Shu , FENG, Bin , ZHANG, Yifan
摘要： A method for detecting service life of a pre-crosslinked material for high-voltage alternating-current cable insulation, comprising: taking a new pre-crosslinked material and carrying out tabletting to obtain a crosslinked polyethylene, measuring the cross-linking degree, mechanical properties and dielectric properties of the crosslinked polyethylene, and taking the measurement results as reference values; carrying out heating for accelerated aging of the pre-crosslinked material, measuring the crosslinking degree, mechanical properties and dielectric properties of a crosslinked polyethylene obtained by tabletting of the pre-crosslinked material that undergoes accelerated aging, and comparing the measurement results with the reference values; when the results fall within an error allowable range, prolonging a heating duration according to a preset step length until the results does not completely fall within the error allowable range; according to a calculation formula of a decomposition rate of a cross-linking agent and a calculation formula of the change of a half-life period along with the temperature, subtracting the step length from the heating duration and then converting into a normal-temperature duration, and obtaining the storage life of the pre-crosslinked material; and carrying out heating for accelerated aging of the pre-crosslinked material, taking the crosslinking degree, mechanical properties and dielectric properties as activity standards, and calculating the storage life of the pre-crosslinked material according to the decomposition rate and the half-life period of the crosslinking agent.
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2.发明公开
公开(公告)号：EP4159711A1
公开(公告)日：2023-04-05
申请号：EP21944454.4
申请日：2021-08-30
发明人： HOU, Shuai , FU, Mingli , LI, Xiaolin , ZHU, Wenbo , HUI, Baojun , FENG, Bin , ZHANG, Yifan , ZHAN, Yunpeng , CHEN, Xiao , ZHANG, Bin , XU, Shu , WU, Guoxing
摘要： The present invention discloses a maleic anhydride modified voltage stabilizer, a preparation method, and use thereof, which belongs to the technical field of high voltage and insulation. The present invention discloses a maleic anhydride modified voltage stabilizer represented by Formula 1 and a preparation method thereof. (1) Maleic anhydride and 2,4-dihydroxybenzophenone are dissolved in tetrahydrofuran to obtain a mixture. (2) In a protective gas atmosphere, the mixture obtained in step (1) is added with a catalyst and stirred, centrifuged with added water, and an obtained precipitate is dried, thereby achieving the maleic anhydride modified voltage stabilizer. The present invention also provides the use of the maleic anhydride modified voltage stabilizer in a cross-linked polyethylene high voltage AC cable insulating material.
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3.发明公开
公开(公告)号：EP4253471A1
公开(公告)日：2023-10-04
申请号：EP21896654.7
申请日：2021-10-21
发明人： HOU, Shuai , LI, Xiaolin , FU, Mingli , ZHU, Wenbo , HUI, Baojun , FENG, Bin , ZHANG, Yifan , WU, Guoxing , XIE, Hong , CHEN, Xiao , XU, Shu
摘要： The present invention provides a semi-conductive shielding material for high-voltage cable, and a preparation method thereof. The semi-conductive shielding material for high-voltage cable includes 100 parts by weight of an ethylene butyl acrylate resin, 25 to 40 parts by weight of conductive carbon black, and 4 to 8 parts by weight of functional auxiliary agents. The conductive carbon black includes high oil absorption value (OAV) conductive carbon black with an OAV ranging from 300ml/100g to 400ml/100g and low OAV conductive carbon black with an OAV ranging from 120ml/100g to 220ml/100g. The weight ratio of the high OAV conductive carbon black to the low OAV conductive carbon black is 1:(2~4). The high-voltage cable semi-conductive shielding material of the present invention has excellent electrical conductivity, mechanical performances, and peeling adhesion. In addition, it also solves the issue of adverse effects on the formability and mechanical performances of the semi-conductive shielding material for high-voltage cable that arise from adding a substantial amount of conductivity carbon black to attain the predetermined conductivity.
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4.发明公开
公开(公告)号：EP4290212A1
公开(公告)日：2023-12-13
申请号：EP21953957.4
申请日：2021-10-21
发明人： HOU, Shuai , FU, Mingli , JIA, Lei , ZHAN, Yunpeng , ZHU, Wenbo , HUI, Baojun , FENG, Bin , ZHANG, Yifan
IPC分类号： G01N11/14
摘要： The present invention relates to the technical field of high voltage and insulation and discloses a cross-linking performance consistency characterization method for 500 kV cross-linked polyethylene cable insulation material. The characterization method includes the following steps: (1) preparing a standard sample: fully stirring and mixing low-density polyethylene and dicumyl peroxide at 63-67°C, and standing to fully diffuse the dicumyl peroxide into the low-density polyethylene; (2) testing, by using a torque rheometer, a cross-linking reaction kinetic curve of the standard sample and a sample to be tested; and (3) eliminating, by using a standard sample transformation method, a difference introduced due to different test places into the cross-linking reaction kinetic curves of the sample. By using the method, cross-linking reaction properties of the 500 kV cross-linked polyethylene cable insulation material are effectively characterized, thereby solving the problem of accurate comparison of results at different test places.
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公开(公告)号：EP4431919A1
公开(公告)日：2024-09-18
申请号：EP21963818.6
申请日：2021-12-01
发明人： FU, Mingli , HOU, Shuai , LI, Xiaolin , ZHANG, Bin , ZHANG, Yifan , ZHU, Wenbo , HUI, Baojun , FENG, Bin , ZHAN, Yunpeng , CHEN, Xiao , XU, Shu , WU, Guoxing
IPC分类号： G01N21/84
摘要： Disclosed is a method for evaluating a degassing effect of a cross-linked polyethylene cable, comprising: acquiring a cable sample to be detected; heating the cable sample to be detected, so as to obtain a transparent cable sample to be detected in which an insulating layer of the cable sample to be detected is in a transparent state; under a darkroom condition, acquiring at least one light spot image of said transparent cable sample under irradiation of a monochromatic laser light source; extracting light intensity data of the at least one light spot image in a preset light spot image range; normalizing the light intensity data, and obtaining the maximum value and an average value of normalized light intensity coefficients of said transparent cable sample in a preset thickness range of the insulating layer; calculating a degassing uniformity coefficient according to the maximum value and the average value; and obtaining an evaluation result of the degassing effect of the cross-linked polyethylene cable according to the maximum value, the average value, and the degassing uniformity coefficient. By means of embodiments of the present invention, the degassing effect of the cross-linked polyethylene cable can be efficiently and quickly evaluated, and the accuracy is relatively high.
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