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Surface Layer Fluorination-Modulated Space Charge Behaviors in HVDC Cable Accessory.
Jin Li1, Boxue Du2, Jingang Su3
1Key Laboratory of Smart Grid of Ministry of Education, School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China. lijin@tju.edu.cn.
Polymers
|April 11, 2019
Summary
Direct fluorination of ethylene propylene diene terpolymer (EPDM) reduces surface energy and suppresses space charge accumulation in high voltage direct current (HVDC) cable accessories. This surface modification enhances insulation performance by introducing shallower electron traps.
Area of Science:
- Materials Science
- Electrical Engineering
- Polymer Science
Background:
- Space charge accumulation on ethylene propylene diene terpolymer (EPDM) surfaces and interfaces in high voltage direct current (HVDC) cable accessories can cause electrical field distortion and dielectric breakdown.
- Direct fluorination is a surface modification technique that can alter polymer properties without significantly changing bulk characteristics.
Purpose of the Study:
- To investigate the effects of direct fluorination on the surface properties and space charge behavior of EPDM for HVDC cable accessory insulation.
- To understand how fluorination influences surface morphology, hydrophobicity, permittivity, conductivity, and charge accumulation.
Main Methods:
- Surface characterization (morphology, hydrophobicity, permittivity, DC conductivity) of EPDM before and after fluorination.
- Pulsed electroacoustic (PEA) method to investigate surface and interface charge behavior in HVDC cable accessories.
- Analysis of 3D potentials and density of states (DOS) to understand trap distributions.
Main Results:
- Fluorination reduced EPDM's surface energy and relative permittivity, improving interface matching in composite insulation.
- Optimal space charge suppression was observed in EPDM treated with 30 minutes of fluorination.
- Fluorination introduced shallower electron traps and altered electrostatic potential, significantly reducing interface space charge accumulation.
Conclusions:
- Direct fluorination is an effective method to mitigate space charge accumulation in EPDM for HVDC cable accessories.
- The modified surface properties and trap distribution resulting from fluorination enhance the dielectric performance and reliability of insulation systems.
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