{"id":6533,"date":"2026-03-25T00:39:48","date_gmt":"2026-03-25T00:39:48","guid":{"rendered":"https:\/\/iruav.com.tw\/?p=6533"},"modified":"2026-04-01T04:07:13","modified_gmt":"2026-04-01T04:07:13","slug":"iec-ts-62446-3","status":"publish","type":"post","link":"https:\/\/iruav.com.tw\/en_us\/news\/iec-ts-62446-3\/","title":{"rendered":"Key Summary of International Standards for Thermal Imaging Inspection of Photovoltaic Systems"},"content":{"rendered":"

Inspection Objectives<\/strong><\/p>\n\n\n\n

\u2022 Identify temperature anomalies that cannot be explained by normal operation or system design<\/p>\n\n\n\n

\u2022 The focus is on identifying potential defects rather than merely measuring temperature<\/p>\n\n\n\n

Inspection Conditions<\/strong><\/p>\n\n\n\n

\u2022 The system shall be in operation during inspection<\/p>\n\n\n\n

\u2022 The system shall reach a stable state<\/p>\n\n\n\n

\u2022 Avoid significant fluctuations in irradiance and load<\/p>\n\n\n\n

Environmental Requirements<\/strong><\/p>\n\n\n\n

\u2022 Irradiance \u2265 500 W\/m\u00b2<\/p>\n\n\n\n

\u2022 Wind speed \u2264 approximately 4 m\/s<\/p>\n\n\n\n

\u2022 Cloud cover \u2264 2\/8<\/p>\n\n\n\n

\u2022 Modules should be kept clean<\/p>\n\n\n\n

Scope of Inspection<\/strong><\/p>\n\n\n\n

\u2022 100% of PV modules<\/p>\n\n\n\n

\u2022 Electrical equipment (cabling, combiner boxes, inverters, etc.)<\/p>\n\n\n\n

Image Acquisition Requirements<\/strong><\/p>\n\n\n\n

\u2022 IR images should be captured as perpendicular to the module surface as possible<\/p>\n\n\n\n

\u2022 Avoid reflections and angular errors<\/p>\n\n\n\n

\u2022 UAVs or ground-based thermal cameras may be used<\/p>\n\n\n\n

Analysis Methodology<\/strong><\/p>\n\n\n\n

\u2022 Calculate the mean temperature of the region<\/p>\n\n\n\n

\u2022 More accurate than single-point measurements<\/p>\n\n\n\n

Temperature Difference Evaluation (\u0394T)<\/strong><\/p>\n\n\n\n

\u2022 Use the temperature difference between the module and its surroundings as the evaluation criterion<\/p>\n\n\n\n

\u2022 Environmental and load conditions shall be taken into account<\/p>\n\n\n\n

Anomaly classification<\/strong><\/p>\n\n\n\n

\u2022 Hot spot<\/p>\n\n\n\n

\u2022 Module anomaly<\/p>\n\n\n\n

\u2022 Overheating at electrical connections<\/p>\n\n\n\n

\u2022 String anomaly<\/p>\n\n\n\n

Trend Analysis<\/strong><\/p>\n\n\n\n

\u2022 Use \u0394T for long-term comparison<\/p>\n\n\n\n

\u2022 Used for degradation monitoring and fault prediction<\/p>\n\n\n\n

Inspection Report Requirements<\/strong><\/p>\n\n\n\n

\u2022 Personnel and equipment information<\/p>\n\n\n\n

\u2022 Inspection date, time, and location<\/p>\n\n\n\n

\u2022 Environmental conditions (irradiance, temperature, wind speed, cloud cover)<\/p>\n\n\n\n

\u2022 Locations of anomalies and corresponding thermal images<\/p>\n\n\n\n

\u2022 Defect classification and maintenance recommendations<\/p>\n\n\n\n

Personnel Qualifications<\/strong><\/p>\n\n\n\n

\u2022 Personnel shall possess knowledge of electrical systems and PV systems<\/p>\n\n\n\n

\u2022 Possess the ability to interpret thermal images<\/p>\n\n\n\n

Conclusion<\/strong><\/p>\n\n\n\n

IEC TS 62446-3 emphasizes that inspections shall be conducted under stable operating conditions, utilizing area-based temperature analysis and temperature differential (\u0394T) evaluation to ensure comprehensive assessment, engineering reliability, and international consistency of the results.<\/p>\n\n\n\n

<\/p>","protected":false},"excerpt":{"rendered":"

\u6aa2\u6e2c\u76ee\u7684 \u2022 \u8fa8\u8b58\u7121\u6cd5\u7531\u6b63\u5e38\u904b\u884c\u6216\u8a2d\u8a08\u89e3\u91cb\u7684\u6eab\u5ea6\u7570\u5e38 \u2022 \u91cd\u9ede\u5728\u65bc\u767c\u73fe\u6f5b\u5728\u7f3a\u9677\uff0c\u800c\u975e\u55ae\u7d14\u91cf\u6e2c\u6eab\u5ea6 \u6aa2\u6e2c\u57f7\u884c\u689d\u4ef6 […]<\/p>\n","protected":false},"author":2,"featured_media":6537,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[5,25],"tags":[31],"class_list":["post-6533","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","category-technology","tag-smart-om"],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/iruav.com.tw\/wp-content\/uploads\/2026\/03\/7cc5d333a428c829a759c85d071ee589.png?fit=600%2C315&ssl=1","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/iruav.com.tw\/en_us\/wp-json\/wp\/v2\/posts\/6533","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/iruav.com.tw\/en_us\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/iruav.com.tw\/en_us\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/iruav.com.tw\/en_us\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/iruav.com.tw\/en_us\/wp-json\/wp\/v2\/comments?post=6533"}],"version-history":[{"count":8,"href":"https:\/\/iruav.com.tw\/en_us\/wp-json\/wp\/v2\/posts\/6533\/revisions"}],"predecessor-version":[{"id":6652,"href":"https:\/\/iruav.com.tw\/en_us\/wp-json\/wp\/v2\/posts\/6533\/revisions\/6652"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/iruav.com.tw\/en_us\/wp-json\/wp\/v2\/media\/6537"}],"wp:attachment":[{"href":"https:\/\/iruav.com.tw\/en_us\/wp-json\/wp\/v2\/media?parent=6533"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/iruav.com.tw\/en_us\/wp-json\/wp\/v2\/categories?post=6533"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/iruav.com.tw\/en_us\/wp-json\/wp\/v2\/tags?post=6533"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}