本指南提供了在额定负载下，绝缘系统额定绕组平均温升为65℃的矿物油浸式变压器和阶梯式电压调节器的加载建议。本指南适用于根据IEEE标准C57制造的变压器。12.001，并根据IEEE标准C57进行测试。12.90，以及按照IEEE Std C57制造和测试的步进电压调节器。15.由于大量变压器和阶梯式电压调节器（其绝缘系统在额定负载下的平均绕组温升为55℃）仍在使用，因此还包括了针对该设备的建议。

This guide provides recommendations for loading mineral-oil-immersed transformers and step-voltage regulators with insulation systems rated for a 65 °C average winding temperature rise at rated load. This guide applies to transformers manufactured in accordance with IEEE Std C57.12.001 and tested in accordance with IEEE Std C57.12.90, and step-voltage regulators manufactured and tested in accordance with IEEE Std C57.15. Because a substantial population of transformers and step-voltage regulators with insulation systems rated for 55 °C average winding temperature rise at rated load are still in service, recommendations that are specific to this equipment are also included.