确定电力变压器在不损坏外部短路产生的过电流影响的情况下保持的要求。描述用于证明电力变压器承受此类过电流的热能力的计算程序，以及用于证明承受相关动态效应能力的特殊试验和理论评估方法。

Identifies the requirements for power transformers to sustain without damage the effects of overcurrents originated by external short circuits. Describes the calculation procedures used to demonstrate the thermal ability of a power transformer to withstand such overcurrents and both the special test and the theoretical evaluation method used to demonstrate the ability to withstand the relevant dynamic effects.