CFAE Method for Condition Assessment of Oil-Impregnated Insulating Paper of Power Transformers
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Abstract
Power Transformers are high-value primary equipment and important components in high voltage networks system. This makes the determination of transformer’s remaining life very important for asset management. The insulation system of most transformers is oil-paper insulation having kraft paper as solid insulation and transformer oil as liquid insulation. The insulating condition of the insulating paper is an important factor affecting the remaining life of a transformer. This is because if the transformer oil insulation deteriorates, it can be replaced throughout its service life; however, this cannot be done with the insulating paper. Therefore, checking of insulating paper’s condition is essential; but, to do it with the degree of polymerization (DP) is very difficult. This article proposed an approach to assess the transformer insulation condition by using results from the transformer oil insulator technical test consisting of oil quality testing, dissolved gas analysis, and furan compound testing in transformer oil. They were processed into the CFAE index indicating the degeneration of the insulating paper inside a transformer and used to compare with the CO2/CO ratio according to IEEE Std. C57.104 and IEC 60599 standards. If the CFAE index was between -2 and -5.3 and the CO2/CO ratio was between 3 and 10, it would ensure that the insulating paper was in usable condition and was not severely degraded inside the transformer. However, if the results conflicted, the results of the oil quality test would be used for further consideration.
Article Details
บทความที่ได้รับการตีพิมพ์เป็นลิขสิทธิ์ของ วารสารวิทยาศาสตร์และเทคโนโลยี มหาวิทยาลัยอุบลราชธานี
ข้อความที่ปรากฏในบทความแต่ละเรื่องในวารสารวิชาการเล่มนี้เป็นความคิดเห็นส่วนตัวของผู้เขียนแต่ละท่านไม่เกี่ยวข้องกับมหาวิทยาลัยอุบลราชธานี และคณาจารย์ท่านอื่นๆในมหาวิทยาลัยฯ แต่อย่างใด ความรับผิดชอบองค์ประกอบทั้งหมดของบทความแต่ละเรื่องเป็นของผู้เขียนแต่ละท่าน หากมีความผิดพลาดใดๆ ผู้เขียนแต่ละท่านจะรับผิดชอบบทความของตนเองแต่ผู้เดียว
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