We leverage historical outage data to quantify the resilience benefits of undergrounding a circuit. The historical performance of the overhead circuit is compared to the performance if the circuit had been undergrounded in the past. The number of outages, customers affected, outage duration, and customer hours lost are used as metrics to quantify the benefits of undergrounding. Results show 75% and 78% reductions in customer hours lost per year for two selected circuits, as well as a significant reduction in the average number of outages and customers affected per year, highlighting the advantages of undergrounding. The benefits of investments that result in 10% faster outage restoration are also calculated by rerunning history with the faster restoration included.

翻译：本文利用历史停电数据量化架空线路地下化带来的抗灾韧性效益。通过将架空线路的历史运行表现与假设过去已完成地下化后的情景进行对比，以停电次数、受影响用户数、停电持续时间及用户损失小时数为指标评估地下化效益。结果显示，两条选定线路的用户年均损失小时数分别减少75%和78%，年均停电次数和受影响用户数亦显著降低，凸显地下化优势。此外，通过将故障恢复时间缩短10%的投资方案纳入历史数据重演，进一步量化了此类投资的效益。