Assessing The Relationship Between Color Change and Tensile Strength In Thermoplastic Polyolefin Outer Sheaths of Low-voltage Power Cables
Öz
Power cables used outdoors age prematurely due to ultraviolet radiation. Their ampacity should be decreased accordingly to take a good performance. The mechanical strength of the cables may decrease and the color of the outer sheath of cable insulation changes when exposed to outdoor UV radiation. It is of great concern to know how the elongation strength of a cable varies with the exposure time to prevent cable break. To evaluate their UV resistance, UV chamber tests are performed. The determination of the color of the cable insulator is also an important part of the test. In this study, Thermoplastic Polyolefin (TPO) insulation to be used in the outer sheath of low-voltage power cables is aged in a Q-SUN Xenon light test chamber. 240-, 480-, and 720-hour test durations are chosen in the experiments. All elongation at break tests are made with a Zwick/Roell Z010 Tensile Tester and a gray scale is used for assessing the color change. It has been found that the color change of Thermoplastic Polyolefin does not reflect the elongation at break and tensile strength value changes much and the elongation at break value of Thermoplastic polyolefin is not a monotonous function of UV exposure time.
Anahtar Kelimeler
Power Cables, Ultraviolet, UV Test, Cable Tests, Gray Scale Color Test, Insulation.
Destekleyen Kurum
Ünika Üniversal Kablo Sanayi ve Tic. A.Ş.
Proje Numarası
UPN-2206
Etik Beyan
The authors declared no conflicts of interest concerning the research, authorship, and/or publication of this article.
Teşekkür
This study has been supported through the project UPN-2206 funded by the research and development center of Ünika Üniversal Kablo Sanayi ve Tic. A.Ş. The researchers are thankful to Kaan Önder and Fatih Yerişenoglu for their assistance.
Kaynakça
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