Journal of the Korean Society of Safety (한국안전학회지)

The Korean Society of Safety (한국안전학회)
권호 표지
DOI QR코드

DOI QR Code

Lifetime Prediction on PVC Insulation Material for IV and HIV Insulated Wire

IV와 HIV 절연 전선용 PVC 절연재료의 수명 예측

  • Received : 2018.12.14
  • Accepted : 2019.01.03
  • Published : 2019.02.28
Download PDF
⟨ Previous Next ⟩

Abstract

Weight and elongation changes of IV and HIV insulations were measured simultaneously at several given temperature of $80^{\circ}C$, $90^{\circ}C$ and $100^{\circ}C$. And the lifetime was predicted using the Arrhenius model. Based on the initial weight values, a 50% elongation reduction was seen at 6.96% for the IV insulation and 10.29% for the HIV insulation. The activation energy from the slope of the lifetime regression equation was calculated as 92.895 kJ/mol(0.9632 eV) for the IV insulation and 95.213 kJ/mol(0.9873 eV) for the HIV insulation. Also, the expected lifetime at the operating temperature of $30^{\circ}C$ to $90^{\circ}C$ is 2.02 to 94.32 years, and longer lifetime was predicted on HIV insulated wires than on IV insulated wires. As a result, it was found that the thermal characteristics of the HIV insulated wires were about 12.44% better than those of IV insulated wires under the same conditions of use.

Keywords

HOJHB0_2019_v34n1_8_f0001.png 이미지

Fig. 1. Plastic test sample [ISO 527 part 2].

HOJHB0_2019_v34n1_8_f0002.png 이미지

Fig. 2. Changing in mass of IV insulation by ageing time.

HOJHB0_2019_v34n1_8_f0003.png 이미지

Fig. 3. Changing in mass of HIV insulation by ageing time.

HOJHB0_2019_v34n1_8_f0004.png 이미지

Fig. 4. Elongation at break of IV insulation by ageing time.

HOJHB0_2019_v34n1_8_f0005.png 이미지

Fig. 5. Elongation at break of HIV insulation by ageing time.

HOJHB0_2019_v34n1_8_f0006.png 이미지

Fig. 6. Prediction of Lifetime at operating temperature of IV and HIV wire.

Table 1. Tendency equation and coefficient of determination (R2) of change in mass by aging time

HOJHB0_2019_v34n1_8_t0001.png 이미지

Table 2. Tendency equation and coefficient of determination (R2) of change in elongation by aging time

HOJHB0_2019_v34n1_8_t0002.png 이미지

Table 3. Experiment data of 50% Elongation time by aging temperature

HOJHB0_2019_v34n1_8_t0003.png 이미지

Table 4. Lifetime predicted by regression line

HOJHB0_2019_v34n1_8_t0004.png 이미지

References

  1. National Fire Agency, "Annual report on fire statistics 2018, p. 104, 2018.
  2. National Fire Agency, "National Fire Information Center E-Fire Statistics", 2017.
  3. K. T. Song and S. I. Lee, "Partial Discharge Diagnosis of Thermal Degradated PVC Cable", Journal of the Korea Institute of Electrical and Electronic Material Engineers, Vol. 24, No. 3, pp. 208-214, 2011. https://doi.org/10.4313/JKEM.2011.24.3.214
  4. C. S. Choi, D. G. Park and H. G. Kim, "A study on the fire hazard of wire for wiring and instrument", Korea Electrical Safety Corporation, Ministry of Trade, Industry and Energy, 2001.
  5. S. G. Choi and S. K. Kim, "Study on the Tracking Characteristics Depending on Accelerated Degradation of PVC Insulation Material", Fire Science and Engineering, Vol. 31, No. 6, pp. 91-98, 2017. https://doi.org/10.7731/KIFSE.2017.31.6.091
  6. S. K. Kim and S. G. Choi, "A Study on the Over-current Characteristics of IV Insulated Wire Sheath According to Accelerated Degradation", Fire Science and Engineering, Vol. 32, No. 2, pp. 48-56, 2018. https://doi.org/10.7731/KIFSE.2018.32.2.048
  7. K. T, Song and S. I. Lee, "Partial Discharge Diagnosis of Thermal Degradated PVC Cable", J. KIEEME, Vol. 24, No. 3, pp. 208-214, 2011.
  8. C. S. Choi, "The Properties Analysis of 600V Grade Polyvinyl Chloride Insulated Wire with Variation of Thermal Stress", T. Korean Institute of Fire Science & Engineering, Vol. 15, No. 1, pp. 108-115, 2001.
  9. H. J. Park, K. H. Kim and H. Kim, "Evaluation of Theraml Aging on PVC Using Thermo Gravimetry Analysis and Accelerated Thermal Aging Test", T. of Korea Institute of Fire Science and Engineering, Vol. 18, No. 3, pp. 45-50, 2004.
  10. Korea Electric Power Research Institute, "Evaluation of Radiation Degradation of Cable in Nuclear Power Plant", Korea Atomic Energy Research Institute, Service report, KAERI/CM-1026, 2007.
  11. J. Y. Kim, "Lifetime Prediction and Accelerated Degradation of EPR Insulation Material for NPP Cables", Thesis for a Master, Wonkwang University, pp. 17-41, 2015.
  12. W. Y. Jung and J. I. Weon, "Characterization of Thermal Degradation of Polyamide 66 Composite: Relationship between Lifetime Prediction and Activation Energy", Polymer(Korea), Vol. 36, No. 6, pp. 712-720, 2012.
  13. An American National Standard, "IEEE Standard for Type Test of Class 1E Electric Cables, Field Splices, and Connections for Nuclear Power Generating Stations", IEEE Std 383, p. 10, 1974.