环氧/碳化硅涂覆环氧树脂直流沿面闪络特性

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DOI：10.15938/j. emc.2025.04.005

中图分类号：TM312 文献标志码：A 文章编号：1007-449X（2025）04-0045-09

DC surface flashover characteristics of EP/SiC coated epoxy composites

ZHANG Jian¹， LIU Heqian1， GAO He²， LI Zhongyuan¹， YANG Hongda¹ZHANG Peng¹， WANG Lei1， LI Zhen²

（1.Electric Power ResearchInstitute，StateGrid HeilongjiangElectricPowerCompanyLimited，Harbin15O03O，China; 2.SchoolofElectricalandElectronic Enginering，Harbin UniversityofScienceand Technology，Harbin15Oo01，China）

Abstract：To address the critical issues of suppressing power grid voltage waveform distortion and the degradation of material insulation properties caused by surface charge accumulation-induced flashover in drytype air-core reactors in power systems，surface coating is widely applied to enhance the insulation performance of materials. The efects of epoxy/silicon carbide （EP/SiC） coatings was investigated with varying SiC content on the surface charge accumulation characteristics and surface flashover properties of EP.Through experimental tests such as surface potential decay （SPD），surface conductivity，and surface flashover voltage，the changes in electrical properties were explored. The study reveals that SiC particles primarily control the shalow traps in EP. The higher the SiC content，the greater the density and the lower the energy level of the shallow traps，which makes surface charges easier to disipate.After the addition of SiC particles，both the energy level and density of shallow traps are altered. Under the combined influence of these factors，the amount of charge deposited on the sample surface is significantly reduced.As the surface charge accumulation decreases，the degree of electric field distortion is reduced， and the surface flashover voltage can be increased by up to 19.37% . The insulation performance of EP is significantly improved.

Keywords：dry-type air-core reactor; EP/SiC； shallow trap energy level; shallow trap density carrier;surface charge; surface flashover； improvement of insulation performance

0引言

干式空心电抗器因可以抑制电网电压波形畸变而广泛应用于电力系统中，其绝缘特性一直备受关注，环氧（epoxy，EP）因其具有优越的机械与电气性能，被广泛应用于特高压电气绝缘等领域[1-4]，成为了干式空心电抗器外绝缘制备的关键材料，但在电力设备长期工作中，可能会因空间电荷在电力设备的表面沉积导致空间电场畸变，从而诱发沿面闪络现象[5-6]，严重破坏了设备表面材料的绝缘特性，会对电力设备的安全稳定运行造成威胁。（剩余13460字）