本指南阐述了通风干式变压器的性能特点、有限的电气和机械互换性，以及所述设备安装的推荐做法，并帮助正确选择此类设备。具体的额定值组合在7500 kVA（含）以下，高压等级在1.2 kV至36 kV（含）之间，低压等级在5 kV以下。本指南不适用于其他类型的变压器，如专用、密封干式、垫装干式、仪表、步进和感应电压调节器、电弧炉、采矿、测试、焊接和整流变压器。

This guide sets forth characteristics of ventilated dry-type transformers relating to performance, limited electrical and mechanical interchangeability, as well as recommended practice for installation of the equipment described, and to assist in the proper selection of such equipment. Specific rating combinations are described up to a base of 7500 kVA inclusive, high-voltage class from 1.2 kV to 36 kV inclusive, and low-voltage class up to 5 kV. This guide does not apply to other types of transformers such as specialty, sealed dry-type, pad-mounted drytype, instrument, step and induction voltage regulators, arc-furnace, mining, testing, welding, and rectifier transformers.