GB/T 20139-2006 in English

《GB/T 20139-2006电气绝缘结构-对已确定等级的散绕绕组绝缘结构进行组分调整的热评定方法》由TC301（全国电气绝缘材料与绝缘系统评定标准化技术委员会）归口，主管部门为中国电器工业协会。
本标准等同采用IEC61858：1999。 本标准规定了一种以确定等级的电气绝缘结构调整后的耐热等级的气评定所必需的试验程序。本标准适用于输入电压不超过1000V的带散绕绕组电气装置的电气绝缘结构。

Scope

This standard specifies the test procedures necessary for the assessment of the adjusted thermal class of an electrical insulation structure of a defined class. This standard applies to the electrical insulation structure of electrical devices with random windings whose input voltage does not exceed 1000V. These test procedures are determined by comparing the performance of the insulation structure to be evaluated with the reference insulation structure. It must be pointed out that these reference insulation structures have been verified by actual operating experience according to IEC 60791-1984, or have passed a test procedure specified in the IEC 61857 series of standards. Evaluation test.