| Title |
Development of Combined Asset Health Index for Asset Management System |
| Authors |
고만석(Man-Suck Ko) ; 권현호(Hyun-Ho Kwon) ; 이진호(Jin-Ho Lee) ; 전상동(Sang-Dong Jeon) ; 김용현(Yong-Hyun Kim) |
| DOI |
https://doi.org/10.5370/KIEE.2024.73.4.700 |
| Keywords |
Health Index; Asset Management System; Risk Matrix; Probability of Failure; Transformer |
| Abstract |
Combined Asset Health Index(CAHI) is presented to justify decisions such as replacement, repair, and additional inspection to reduce risks in the asset management system. CAHI evaluates the condition of assets using its purchase, installation, operation, visual inspection, off-line diagnosis and on-line monitoring data. CAHI identifies assets that are high risk of failure or deterioration based on the result of the asset condition. CAHI calculates condition index which represents the condition of the asset(Probability of Failure), and degradation index which represents the deterioration of the asset. Additionally, strategic index is calculated by applying the practice of replacement according to their operation age. Three indices are combined into worst case and presented as CAHI.
CAHI was applied to 628 operating power transformers to evaluate its effectiveness. The condition index confirmed that each condition indicator independently indicates the probability of failure. The degradation index confirmed that asset management policies can be established by assigning weights to each degradation index based on an example in which high weight assigned to the type of insulating paper and oil preservation system. However, the condition index and degradation index did not increase and showed randomly as the operation age of the transformer increased. Therefore, strategic index is presented by applying the practice of preventive replacement according to operation age. |