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Variation in Properties of Seawater Flooded and Non-Flooded CSPE

해수범람 전·후의 CSPE 특성변화

  • Lee, Jeong-U (Dept. of Electrical Engineering, Wonkwang University) ;
  • Kim, In-Yong (Expert Group Instrumentation & Electric Control Department, Korea Institute of Nuclear Safety) ;
  • Ji, Seong-Hyun (Expert Group Instrumentation & Electric Control Department, Korea Institute of Nuclear Safety) ;
  • Jeon, Hwang-Hyun (Dept. of Electrical Engineering, Wonkwang University) ;
  • Shin, Yong-Deok (Dept. of Electrical Engineering, Wonkwang University)
  • Received : 2015.10.01
  • Accepted : 2015.11.11
  • Published : 2015.12.01

Abstract

Chlorosulfonated polyethylene (CSPE) was not flooded seawater and flooded seawater & freshwater for 5 days, respectively, and these samples are referred to as BSF(before seawater flooding) and ASFF(after seawater & freshwater flooding), respectively. The apparent density, dissipation factor, relative permittivity, melting temperature, dielectric breakdown time and increased time of applied voltage are higher than those of BSF, but the insulating resistance, dielectric strength, percent elongation and glass transition temperature of ASFF are lower than those of BSF. The differential temperature of those is $0.026{\sim}0.028(^{\circ}C)$ after AC and DC voltage is applied to ASFF, respectively, and the differential temperature of those is $0.013{\sim}0.037(^{\circ}C)$ after AC and DC voltage is applied to BSF, respectively. In the case AC and DC voltage is applied to ASFF as well as BSF, the variations in temperature of AC voltage are higher than those of DC voltage. It is investigated that dielectric loss due to dissipation factor ($tan{\delta}$) is related to electric dipole conduction current. It is certain that the ionic (electron or hole) leakage current was increased by conducting ions such as $Na^+$, $Cl^-$, $Mg^{2+}$, $SO_4^{2-}$, $Ca^{2+}$ and $K^+$, those are related to cured atoms of O and S that relatively increased after seawater flooding.

Keywords

CSPE;Seawater & freshwater flooding;Insulating resistance;Dissipation factor;Dielectric breakdown time;Percent elongation;Differential temperature of AC/DC voltage;Glass transition temperature;Melting temperature

Acknowledgement

Supported by : 원자력안전위원회, 한국방사선 안전재단

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Cited by

  1. Effects of Seawater & Freshwater Soaking on the Cure Properties of Accelerated Thermally Aged CSPE vol.65, pp.5, 2016, https://doi.org/10.5370/KIEE.2016.65.5.819