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Assessments for Distance through Insulation (DTI) of PV Encapsulant/ Backsheet Materials
H.-H. Hsieh, W.-H. Wang, M.-T. Kuan, C.-C. Wang, C.F. Hsieh
Backsheet, Encapsulant/s, Distance through insulation (DTI), IEC 61730-1:2016
Photovoltaic Modules and BoS Components
Subtopic: PV Module Design, Manufacture, Performance and Reliability
Event: 35th European Photovoltaic Solar Energy Conference and Exhibition
Session: 5CV.3.43
1360 - 1362
ISBN: 3-936338-50-7
Paper DOI: 10.4229/35thEUPVSEC20182018-5CV.3.43
0,00 EUR
Document(s): paper


The amended safety requirements of PV modules is proposed in the latest edition IEC 61730-1:2016. It is noted that the distance through insulation (DTI) test replaces partial discharge test due to its authenticity to the practical applications. The insulation layers containing encapsulants and backsheet is especially concerned for its safety characteristics in the increasing system voltage of > 1000 V. According to the IEC standard, the minimum thickness of the insulation should not be less than 150 μm for a PV system of less than 1000 V, while a thickness of > 300 μm is required for a PV system of < 1500 V. To study the actual thickness of insulation layer, encapsulant/backsheet laminates are carried out to evaluate the thickness. In the current research, we report the DTI values of 2 encapsulants and 3 backsheets laminates. A polyolefin-based encapuslant is also contained for its highly demanding in the glass-to-glass PV systems. Furthermore, the triple-layer backsheets are deployed for this study. This may facilitate the solar manufacturers to control or screening the quality as IQC. This paper delivers the preparation method of DTI samples, and their testing results are also revealed for discussion.