Effect of Crosslinking Agent Content on Dielectric Properties of PP Films Modified by EB Irradiation for HVDC Capacitor

IF 2.9 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Dielectrics and Electrical Insulation Pub Date : 2024-11-18 DOI:10.1109/TDEI.2024.3502000

Meng Xiao;Yuyan Chen;Haoliang Liu;Boxue Du

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引用次数: 0

Abstract

The decline in breakdown strength and the rise in dielectric loss of polypropylene (PP) film at high temperatures are the key factors restricting the application of metalized film capacitors (MFCs). This article proposed a modification method using electron-beam (EB) irradiation to improve the high-temperature insulation performance of PP film for capacitors. The influence of crosslinking agent contents on the dielectric properties of irradiated crosslinked PP is investigated. The results show that the conductivity of EB-irradiated films doped with 0–2 wt% pentaerythritol triacrylate (PETA) is reduced by 26.9%–60.8% and the breakdown strength is enhanced by 2.8%–21.2% at

$125~^{\circ }$

C, resulting in better dielectric properties compared to pure PP films. The formation of a 3-D network structure by crosslinking can inhibit the thermal motion of molecular chains and improve their thermal stability, consequently limiting the transport behavior of carriers. Irradiation crosslinking modification can improve the high-temperature dielectric properties of PP films. This research provides a valuable reference for the crosslinking modification of PP films serving in MFCs.

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交联剂含量对EB辐照改性高压直流电容器用PP膜介电性能的影响

高温下聚丙烯薄膜的击穿强度下降和介质损耗增加是制约金属化薄膜电容器应用的关键因素。本文提出了一种利用电子束辐照改善电容器用PP薄膜高温绝缘性能的方法。研究了交联剂含量对辐照交联PP介电性能的影响。结果表明，在$125~^{\circ}$ C时，掺0-2 wt%季戊四醇三丙烯酸酯（PETA）的eb辐照膜的电导率降低了26.9% ~ 60.8%，击穿强度提高了2.8% ~ 21.2%，与纯PP膜相比，具有更好的介电性能。通过交联形成三维网络结构可以抑制分子链的热运动，提高分子链的热稳定性，从而限制载流子的输运行为。辐照交联改性可以改善PP薄膜的高温介电性能。本研究为mfc中聚丙烯薄膜的交联改性提供了有价值的参考。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Transactions on Dielectrics and Electrical Insulation 工程技术-工程：电子与电气

CiteScore

6.00

自引率

22.60%

发文量

309

审稿时长

5.2 months

期刊介绍： Topics that are concerned with dielectric phenomena and measurements, with development and characterization of gaseous, vacuum, liquid and solid electrical insulating materials and systems; and with utilization of these materials in circuits and systems under condition of use.