Abstract
Simultaneously increasing cost pressure and the need for grid expansion demands savings in the field of distribution grid operation. The implementation of a risk-based maintenance strategy promises low costs while maintaining high reliability, because equipment is maintained according to its technical condition and importance. Based on a simulative analysis of the influences of medium-voltage grid characteristics on the loss of energy due to failures of the ring main unit, the individual importance of key indicators is determined by the analysis of variance and conjoint analysis. Furthermore, a simulative comparison of condition and risk-based maintenance strategies are performed using a condition-based asset simulation. The results show the impact of the weighting of condition and importance for determining a risk index on the loss of energy and costs for maintenance and fault clearance.
Highlights
The need for savings in the field of grid operation leads to an ongoing implementation of risk-based maintenance schemes to ensure the reliable and safe operation of medium-voltage/ low-voltage (MV/LV) substations
The maintenance costs are calculated by summation of material costs, man-hours and the time to arrive to the MV/LV substations
Risk-based maintenance schemes promise low maintenance costs while maintaining a high reliability of the grid, because maintenance measures are planned according to the technical condition of the equipment and the consequences in case of failures only
Summary
The need for savings in the field of grid operation leads to an ongoing implementation of risk-based maintenance schemes to ensure the reliable and safe operation of medium-voltage/ low-voltage (MV/LV) substations. The condition and importance of MV/LV substations are evaluated separately by assessment procedures and plotted on a two-dimensional coordinate system. The risk is determined by calculating the length of the connecting line between the substation’s dot and a diagonal intersection of the axis [1]. The weighting of importance and condition can be adapted by varying the angle between the diagonal and the axis. As different condition assessment procedures as well as parameterisations lead to diverse evaluation results, it is necessary to develop methods for the benchmark of assessment procedures for the condition as well as the importance of the equipment and resulting risk
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