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Although China's photovoltaic industry is experiencing a cold snap, this emerging industry that has experienced extraordinary development over the past few years has finally had its own international standards project at the end of 2011. The reporter was informed that the International Electrotechnical Commission (IEC) Photovoltaic Modules Committee passed a PV standard selected by China in the vote of the national members held this month. For the first time, the Chinese PV industry, which has half of the world's PV production and production capacity, has its own international standards, and is only a stone's throw away from international standards. The International Electrotechnical Commission is the international authority for the publication of international standards for electrical engineering. At present, the committee's photovoltaic component committee has issued 66 international standards, but as the world's largest photovoltaic manufacturing supplier, China has not been able to participate in any of them. This was approved as an international standard project, the industrial standard numbered IEC 62775, the full name is "the ethylene-vinyl acetate copolymer (EVA) cross-linking degree test method for photovoltaic modules - differential scanning calorimetry (DSC)", It was submitted by the domestic photovoltaic giant Trina Solar. According to the source, according to the usual practice, after the relevant standards have been approved by international standards, they will become the universal international standard only after they have been publicized. If all goes well, the new standard will be officially announced in 2014. For a long time, a common pursuit of the photovoltaic industry is how to make sunlight lose less in the photoelectric conversion process: such as using better cells to increase conversion efficiency, and using better reflective layers to maximize the use of incident light. Use thinner silver wires to increase the incident area of ​​light, and so on. How to ensure the transparency of the packaging materials of photovoltaic modules in long-term use is also an important factor for the long-term maintenance of high power output of photovoltaic modules. At present, the international mainstream photovoltaic module packaging material is EVA (ethylene-vinyl acetate copolymer) material. How to ensure and control the quality of EVA raw materials and the quality of cross-linking after application of the lamination process on photovoltaic modules is a major issue for EVA applications. In the past, the industry used the traditional chemical analysis method - xylene extraction method to test the degree of cross-linking of EVA, but this method has major drawbacks. On the one hand, the test method is too long, and the test accuracy will also appear due to different time. Large differences, on the other hand, xylene itself is a chemical that is harmful to both the environment and the human body. Using DSC, by accurately measuring the heat flux of the phase change of the photovoltaic packaging material to determine the quality of the polymer packaging of the photovoltaic module, it has the characteristics of fast, high precision and environmental friendliness, and is considered to be able to effectively compensate and replace the traditional xylene. A new process for extraction. “We used this method for EVA incoming inspection a year ago. Compared with the traditional xylene test method, the DSC method is cleaner, faster and safer, and the test time is shortened from more than ten hours of xylene to less than half an hour. Greatly improved quality control and response speed, but also reduced costs." Zhou Wei, vice president of Trina Solar's quality department. Sun Haiyan, vice president of Trina Solar's Asia Pacific region, who represented China at the International Conference of the International Electrotechnical Commission held this month, said that in terms of international standards for photovoltaic systems, the West is not much ahead of China. China is a rising star in the photovoltaic industry. More active participation in the formulation of international standards, to seize the right to speak international standards.