Test Method and Result Analysis of Breakdown Strength for Capacitor-Grade Polypropylene Film

Xiaohui Su; Hua Li; Yufan Xu; Tongwei Zhang; Rui Lu; Fuchang Lin

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Test Method and Result Analysis of Breakdown Strength for Capacitor-Grade Polypropylene Film

POWER CAPACITOR & REACTIVE POWER COMPENSATION

Test Method and Result Analysis of Breakdown Strength for Capacitor-Grade Polypropylene Film
电容器用聚丙烯薄膜击穿场强测试方法及其结果分析
1.State Key Laboratory of High Density Electrical Energy Conversion (Huazhong University of Science and Technology), Wuhan 430074, Hubei
2.School of Electrical and Electronic Engineering, Wuhan 430074, Hubei
3.Key Laboratory of Pulse Power Technology (Ministry of Education), Wuhan 430074, Hubei
(2026)
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Xiaohui Su, Hua Li, Yufan Xu, et al. Test Method and Result Analysis of Breakdown Strength for Capacitor-Grade Polypropylene Film[J/OL]. Power Capacitor & Reactive Power Compensation, 2026.
DOI：

Xiaohui Su, Hua Li, Yufan Xu, et al. Test Method and Result Analysis of Breakdown Strength for Capacitor-Grade Polypropylene Film[J/OL]. Power Capacitor & Reactive Power Compensation, 2026. DOI：

摘要

击穿场强是评价电容器用聚丙烯薄膜绝缘性能的关键指标，但其测试结果不仅取决于试样自身性能，而且受测试方法影响显著。为实现国产聚丙烯薄膜性能的对比迭代并与进口产品对标，必须选取一种可反映客观性能的击穿场强测试方法。针对这一需求，本文以国产电容器用聚丙烯薄膜为对象，开展了不同击穿测试方法的对比研究。通过改变测试电极结构等相关试验条件，获得了不同方法下薄膜击穿场强数据，并结合统计分析方法对测试结果进行比较。结果表明，不同测试方法所得击穿场强存在显著差异。综合考虑测试准确性、重复性、操作简便性和工程推广性，本文建议采用五十点电极方法作为电容器用聚丙烯薄膜击穿场强评价的推荐方法。研究结果可为国产聚丙烯薄膜质量评价、不同批次材料性能比较以及与进口薄膜产品的对标测试提供参考。

Abstract

Breakdown strength is a key indicator for evaluating the insulation performance of polypropylene films used in capacitors. However

the results are not only determined by the intrinsic properties of material

but are also significantly affected by the testing method. To enable iterative performance comparison of domestic polypropylene films and objective benchmarking against imported products

it is necessary to select a breakdown strength test method that can accurately reflect the material performance. This paper conducts a comparative study of different testing methods using domestic polypropylene films. By varying the electrode configuration and other relevant experimental conditions

breakdown strength data of the films under different methods were obtained. Statistical analysis was then performed to compare the test results. The results show that the breakdown strength values obtained by different testing methods differ significantly. Considering testing accuracy

repeatability

operational simplicity and engineering applicability

this paper recommends the fifty-point electrode method as the preferred method for evaluating the breakdown strength of polypropylene films for capacitors. The results provide a reference for quality evaluation of domestic polypropylene films

performance comparison among different batches

and benchmarking tests against imported film products.

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references

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