For substations that are designed to carry full load under the outage of any one transformer, a high emergency rating for a 24-hour period could mean the selection of smaller transformers and a substantial saving in substation cost.

• 对于设计为任何一台变压器停运时仍能带满负荷的变电站,其24小时的高紧急情况额定值可能意味着可选择容量较小的变压器,这可大大节省变电站的造价。