CRADLE – A NEW ASSET MANAGEMENT TECHNOLOGY BEING DEVELOPED IN CHINA
The most important duty of a corporation is to achieve its economic target and social responsibility target. Asset Management, as one way of great potential to achieve those targets, is being focused on in power systems of China, especially in State Grid. Life Cycle Cost Management (LCCM) and Condition Based Maintenance (CBM) are two effective tools used in asset management. Life-cycle cost refers to all costs associated with the system as applied to the defined life cycle (BLANCHARD and FABRYCKY, 1998), such as labour, contractors, repairs, reliability improvements, environmental and so on. Minimal life-cycle cost means the best choice in economic benefit. CBM includes equipment condition assessment, risk assessment and aid-decision making. Its emphasis is not how to maintain the equipment but how to make maintenance decision. In the past, these two tools seemed to be isolated, causing maintenance decisions being made based on equipment condition or time. Based on LCCM theory and experiences in other domains, operation and maintain would be 45％ of the life-cycle cost. Their optimization might reduce only 5％ of life cycle costs for most costs were determined during the design and plan. But it would be different in power system. Compared with other common equipments, electric transmission and transformation equipments are very special for they have electric continuity. Once equipment failure occurred, equipment damage cost would be great but the hazard brought by it to the power grid might be much more enormous. What’s more, additional environment loss and social loss would be vital too. So there should be a solution to balance all the costs. Obviously, these costs are connected with the equipment condition. To get a quantitative description of them, probability analysis technique should be drawn in. Failure rate, the probability of equipment would fail in a short period, should be derived from equipment condition. It is quite different from bathtub curve theory. Aid-decision is the third important problem. All the condition assessment and risk assessment serves for it. Back to the two basic duty of corporation, economic benefit might be only one of the decision foundations. LCCM would not meet all needs from power system and society, especially in China. Though there are some methods to turn environment loss cost, safety loss cost and social loss cost into economic index, the conception of cost is not wide accepted. Multi-purposes optimization would be more reasonable, which is derived from risk theory. To optimize asset management in power systems governed by State Grid of China, a new technology named as Condition and Risk Assessment Based Maintenance Decision of Life Cycle Management for Electric Equipments (CRADLE) is proposed in this paper. Compared with former work, this technology gives a comprehensive solution to three problems: failure rate calculation based on equipment condition, risk assessment for power system and decision-making based on multi-purposes optimization. It can be regarded as a balance between the value of equipments themselves and benefits they can bring to power systems, a balance between LCCM and CBM, and finally, a balance between technologies applied and management of power system.
Asset management Condition based maintenance Life cycle cost management Risk assessment
SHAOFENG YU WENTANG HU ZONGXIANG LU SHENGYOU GAO
ZHEJIANG EPTRI, CHINA TSINGHUA UNIVERSITY CHINA
国际会议
桂林
英文
1-9
2009-10-28（万方平台首次上网日期，不代表论文的发表时间）