Research On The Condition-based Maintenance Strategy Oftransformer Based On Risk And LCC

Currently widely used in electric power industry in our country in view of the power transformer maintenance method mainly for preventive maintenance and overhaul two, because these two kinds of maintenance of repair cycle arrangements unreasonable, tend to cause transformer owe maintenance, maintenance or blind maintenance problems. Equipment state inspection technology has become an important part of power grid maintenance system. State overhaul in dueling maintenance timing rely on simple to determine the maintenance cycle for preventive maintenance have certain advantages, it according to the real-time running condition of the equipment information evaluation of equipment state, and to determine the repair cycle maintenance content choice, more scientific and reasonable.Transformer condition maintenance strategy based on risk and LCC study on the risk theory and the LCC theory, through accurate evaluation power transformer running state and scientific maintenance strategy is two parts of power transformer under the state overhaul system maintenance strategy method were studied. In condition assessment of power transformer, this topic combines the transformer real-time monitoring data and relevant operational reports and the quantity of state information such as the history, in the state of oil-immersed transformer(reactor) guidelines for the evaluation of technical standards, such as standard as the basis, first using the fault tree method of transformer faults the risk source of risk events were analyzed, and specific risk factors, build the evaluation index system of the transformer, using analytic hierarchy process(ahp) on the relative importance of each target are analyzed to determine the index weight, and then the method based on health index, by the power transformer health index score and the failure rate; Asset losses caused by transformer faults own equipment and pose a threat to power grid operation loss of two approaches to determine the power transformer fault consequences value, then draws the risk value and transformer according to the ALARP principle will be divided risk level. Clear risk value of the power transformer are level, this topic put forward a set of relatively perfect maintenance strategy method. First consider the power transformer maintenance resource constraints and power grid operation conditions, a series of constraints in the transformer overhaul according to value at risk by area, after combining based on LCC analysis method of transformer best economic life, choose the appropriate maintenance method, according to the reducing transformer takes the risk value and the cost of computing priority coefficient arrange maintenance repair time. The method for transformer from the constraints of different risk rank, maintenance method and maintenance time three aspects to formulate appropriate maintenance strategy, pay attention to the balance of costs and benefits. At last, through actual case analysis to verify the state of transformer maintenance strategy based on risk and LCC, formulate the effectiveness of the method.