Assessing The Relationship Between Color Change and Tensile Strength In Thermoplastic Polyolefin Outer Sheaths of Low-voltage Power Cables

Year 2024, Volume: 25 Issue: 1, 11 - 19

Metin Yurtsever , Avşin Öztaş , Reşat Mutlu

https://doi.org/10.59314/tujes.1432057

Abstract

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.

Keywords

Power Cables, Ultraviolet, UV Test, Cable Tests, Gray Scale Color Test, Insulation.

Ethical Statement

The authors declared no conflicts of interest concerning the research, authorship, and/or publication of this article.

Supporting Institution

Ünika Üniversal Kablo Sanayi ve Tic. A.Ş.

Project Number

UPN-2206

Thanks

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.

Alçak Gerilim Güç Kablolarının Dış Kılıfında Kullanılan Termoplastik Poliolefinin Renk Değişimi ile Gerilme Direnci Arasındaki İlişkinin Değerlendirilmesi

Abstract

Açık havada kullanılan güç kabloları morötesi radyasyon nedeniyle erken yaşlanır. İyi bir performans alabilmek için kabloların akım taşıma kapasitelerinin buna göre azaltılması gerekir. Dış mekânda mor ötesi ışınlarına maruz kaldığında kabloların mekanik mukavemeti azalabilir ve kablonun dış kablo kılıfının rengi değişir. Kablo kopmasını önlemek için bir kablonun uzama mukavemetinin maruz kalma süresine göre nasıl değiştiğini bilmek büyük önem taşımaktadır. UV dirençlerini değerlendirmek için UV odası testleri yapılır. Kablonun yalıtkanının renginin belirlenmesi de testin bir parçasıdır. Bu çalışmada alçak gerilim güç kablolarının kılıfında kullanılacak Termoplastik Poliolefin (TPO) yalıtkanının Q-SUN Xenon ışık test odasında yaşlandırılması yapılmıştır. Deneylerde 240, 480 ve 720 saatlik test süreleri seçilmiştir. Kopma esnasındaki uzama için tüm testler Zwick/Roell Z010 Çekme Test Cihazı ile yapılmıştır ve renk değişimini değerlendirmek için gri skala kullanılmıştır. Termoplastik Poliolefin’in renk değişiminin kopma uzamasını ve gerilme direncinin değişimini fazla yansıtmadığı ve Kopma uzamasının morötesi maruziyet zamanının monoton bir fonksiyonu olmadığı ve tespit edilmiştir.

Keywords

Güç Kabloları, Ultraviyole, UV Testi, Kablo Testleri, Gri Tonlama Renk Testi, Yalıtım.

Project Number

UPN-2206

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