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IEC 62788-1-7-ed.1.0
Measurement procedures for materials used in photovoltaic modules - Part 1-7: Encapsulants - Test procedure of optical durability
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STANDARD published on 21.4.2020
The information about the standard:
Designation standards: IEC 62788-1-7-ed.1.0
Publication date standards: 21.4.2020
SKU: NS-992387
The number of pages: 26
Approximate weight : 78 g (0.17 lbs)
Country: International technical standard
Category: Technical standards IEC
The category - similar standards:
Annotation of standard text IEC 62788-1-7-ed.1.0 :
IEC 62788-1-7:2020 is designed as a more rigorous qualification test, using accelerated UV exposure at elevated temperature to determine whether polymeric encapsulants can suffer loss of optical transmittance. IEC 61215-2 already includes a UV preconditioning test (MQT 10), however, the parameters for that test only represent a limited level of exposure (~weeks of UV dose). This test procedure is intended for representative coupon specimens, applying stress at a greater intensity (designed relative to Phoenix, AZ), using a radiation spectrum that is more similar to the terrestrial solar spectrum, and using a duration of exposure that is more relevant to the PV application (i.e., equivalent to several years of outdoor exposure). This test quantifies the degradation rate of encapsulants so that the risk of the materials losing optical transmittance during operation in the terrestrial environments can be managed. The quantitative correlation between climate (or location of use), a specific application (utility installation, residential-installation, roof-mount, rack-mount, use of a tracker, the system electrical configuration and its operation), and the test can be established for each specific encapsulant material, but is beyond the scope of this document. l’IEC 62788-1-7:2020 est concue comme un essai de qualification plus rigoureux, qui utilise une exposition aux UV acceleree a temperature elevee destinee a determiner si les encapsulants polymerises peuvent presenter une perte de facteur de transmission optique. L’IEC 61215-2 comprend deja un essai de preconditionnement aux UV (MQT 10), toutefois, les parametres de cet essai ne representent qu’un niveau limite d’exposition (~semaines de dose d’UV). La presente procedure dessai concerne les eprouvettes de coupon representatives et applique des contraintes d’une plus grande intensite (concues par rapport a Phoenix, AZ), en utilisant un spectre de rayonnement qui est plus proche du spectre lumineux solaire terrestre et une duree dexposition plus pertinente pour l’application PV (c’est a dire equivalente a plusieurs annees dexposition en exterieur). Cet essai quantifie la vitesse de degradation des encapsulants de maniere a pouvoir gerer le risque de perte de facteur de transmission optique des materiaux au cours du fonctionnement dans l’environnement terrestre. La correlation quantitative entre le climat (ou le lieu dutilisation), une application specifique (installation de service public, installation residentielle, montage sur toit, montage sur chassis, utilisation dun traqueur, configuration electrique du systeme et son fonctionnement) et l’essai peut etre etablie pour chaque materiau d’encapsulation specifique mais n’entre pas dans le domaine d’application du present document.
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