Study on the Application of Roughened Films From Pure Domestic Pellets and Composite Pellets in Oil-immersed High-voltage Capacitors

LEI Qiaoshu; YAN Hao; LIANG Xiao

doi:10.14044/j.1674-1757.pcrpc.2026.04.011

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Study on the Application of Roughened Films From Pure Domestic Pellets and Composite Pellets in Oil-immersed High-voltage Capacitors

POWER CAPACITOR & REACTIVE POWER COMPENSATION | Key Technologies for the Full-chain Localization of Polypropylene Film Capactors

Study on the Application of Roughened Films From Pure Domestic Pellets and Composite Pellets in Oil-immersed High-voltage Capacitors
纯国产粒料和复合粒料粗化膜在油浸式高压电容器中的应用性研究
Wuxi Sunking Power Capacitor Co., Ltd., Jiangsu Wuxi 214177, China
Vol. 47, Issue 4, Pages: 91-99(2026)
DOI：10.14044/j.1674-1757.pcrpc.2026.04.011
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LEI Qiaoshu, YAN Hao, LIANG Xiao. Study on the Application of Roughened Films From Pure Domestic Pellets and Composite Pellets in Oil-immersed High-voltage Capacitors[J]. Power Capacitor & Reactive Power Compensation, 2026, 47(4): 91-99.
DOI：

LEI Qiaoshu, YAN Hao, LIANG Xiao. Study on the Application of Roughened Films From Pure Domestic Pellets and Composite Pellets in Oil-immersed High-voltage Capacitors[J]. Power Capacitor & Reactive Power Compensation, 2026, 47(4): 91-99. DOI： 10.14044/j.1674-1757.pcrpc.2026.04.011.

摘要

针对油浸式高压电容器用聚丙烯粗化膜粒料依赖进口的问题，以两家厂商生产的纯进口粒料、复合粒料、纯国产粒料粗化膜为研究对象，系统开展材料理化性能、电气性能及成品电容器多维度对比试验。测试分析薄膜粗化度、结晶度、机械性能、热收缩率，并采用50点电极法、元件试验、模型电容器试验评价电气特性，同时对成品开展介质损耗、热稳定及加速老化试验。结果表明：纯国产粒料薄膜粗化沟槽更深，电气性能离散性大、击穿场强偏低，高温介质损耗不达标，加速老化寿命不足；复合粒料薄膜在微观形貌、理化特性、电气稳定性及耐老化性能上均与进口粒料薄膜接近，各项指标满足标准要求。研究证实复合粒料粗化膜可替代进口材料投入实际应用；纯国产粒料膜需优化原料与制膜工艺、降低设计场强以提升使用可靠性。研究成果可为国产聚丙烯粗化膜在高压电容器领域的推广应用提供参考。

Abstract

In response to the dependence on imported polypropylene pellets for roughened films in oil-immersed high-voltage capacitors

in this study the roughened films derived from such three pellet categories as purely imported

composite

and purely domestic from two manufacturers are taken as the study object. A comprehensive array of comparative tests

covering physicochemical properties

electrical behavior

and multi-dimensional characteristics of the finished capacitors

is performed. The roughness

crystallinity

mechanical properties and thermal shrinkage of the films are tested and analyzed. The 50-point electrode method

component tests and model capacitor tests are adopted to assess the electrical characteristics and

at the same time

tests including dielectric loss

thermal stability and accelerated aging are performed on finished products. The results show that the pure domestic pellets have deeper roughened grooves

larger dispersion of electrical properties

lower breakdown field strength

noncompliance of dielectric loss at high temperature and insufficient service life under accelerated aging. In contrast

the films made of composite pellets are close to those made of imported pellets in terms of microscopic morphology

physical and chemical properties

electrical stability and aging resistance

with all indicators meeting relevant standards. It is verified by the study that the composite pellet roughened films can replace imported materials for practical application. For pure domestic pellet films

it is necessary to optimize raw materials and film-making processes as well as reduce the design field strength to improve operational reliability. The study results can provide a reference for the popularization and application of domestic polypropylene roughened films in high-voltage capacitors.

关键词

Keywords

references

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