本试验程序的目的是建立一种方法，通过比较，估算在实际运行条件下特种变压器绝缘系统的预期寿命。特种变压器的电气绝缘由许多不同的部件组成，这些部件经过选择，能够承受结构不同部位产生的各种不同的电气、机械和热应力。保温系统的可用时间取决于保温材料物理支撑的有效性、作用在保温材料上的力的严重程度，以及材料本身和使用环境。 因此，绝缘系统的使用寿命将取决于其单个部件的排列方式、它们之间的相互作用，以及每个部件对系统电气和机械完整性的贡献。本试验程序旨在使复合结构的每个部件在试验期间在与变压器实际运行条件相似的条件下运行和执行，仅在必要时进行修改以加速故障。 长期暴露在高温下是这些试验中采用的主要老化因素。其他测试，如机械应力、潮湿暴露和电压的选择，应能迅速发现并揭示绝缘系统的任何重大缺陷或劣化

The object of this Test Procedure is to establish a method for estimating by comparison the life expectancy of specialty transformer insulation systems under actual operating conditions. The electrical insulation of specialty transformers is made up of many different components selected to withstand the widely different electric, mechanical, and thermal stresses occurring in different parts of the structure. How long an insulation system will be serviceable depends on the effectiveness of the physical support for the insulation, and the severity of the forces acting on it, as well as on the materials themselves and the service environment. Therefore, the length of useful life of the insulation system will depend on the way that its individual components are arranged, their interactions upon each other, and the contribution of each component to the electrical and mechanical integrity of the system. It is the intent of this Test Procedure to have each component of the composite structure operate and perform during the test under conditions which are similar to actual operating conditions in the transformer, modified only as necessary to accelerate failure. Prolonged exposure to high temperature is the principal aging factor employed in these tests. Other tests such as mechanical stress, exposure to moisture, and voltage have been chosen in such a way as to develop and disclose promptly any significant weakness or deterioration of the insulation system