IEC 60076-3:20 13规定了绝缘要求和参考特定绕组及其端子的相应绝缘测试。本国际标准适用于IEC 60076-1定义的电力变压器。它还建议空气中的外部间隙。它给出了适用的介电测试和最低介电测试水平的细节。当买方未指定带电部件之间以及带电部件与地面之间的空气中推荐的最小外部间隙时，给出了这些间隙。对于有自己的IEC标准的电力变压器和电抗器类别，本标准仅适用于在其他标准中通过交叉引用具体调用的范围。本次IEC 60076-3第三版取消并取代了2000年出版的第二版，构成技术修订。较上一版主要变化如下: -明确确定了三类变压器以及相关测试要求，这些要求总结在表1中。 -针对Um>72.5 kV的值定义开关脉冲电平。 -已修订PD感应电压测试程序，以确保足够的相间测试电压。 -重新定义了交流耐受试验（LTAC代替ACSD）。 -感应电压测试现在基于Ur而不是Um。 -引入了脉冲波形（k因子）的新要求。 -测试水平表已合并并与IEC 60071-1:20 10保持一致。 -针对Um>800 kV引入了额外的测试水平。 -引入了新的附件E，其中列出了分配试验、试验水平和空气间隙所用的原则。

IEC 60076-3:2013 specifies the insulation requirements and the corresponding insulation tests with reference to specific windings and their terminals. This International Standard applies to power transformers as defined by IEC 60076-1. It also recommends external clearances in air. It gives details of the applicable dielectric tests and minimum dielectric test levels. Recommended minimum external clearances in air between live parts and between live parts and earth are given for use when these clearances are not specified by the purchaser. For categories of power transformers and reactors which have their own IEC standards, this standard is applicable only to the extent in which it is specifically called up by cross reference in the other standards. This third edition of IEC 60076-3 cancels and replaces the second edition published in 2000, and constitutes a technical revision. The main changes from the previous edition are as follows:
- Three categories of transformer are clearly identified together with the relevant test requirements, these are summarised in Table 1.
- Switching impulse levels are defined for values of U_m > 72,5 kV.
- The procedure for Induced voltage tests with PD has been revised to ensure adequate phase to phase test voltages.
- The AC withstand test has been redefined (LTAC instead of ACSD).
- Induced voltage tests are now based on U_r rather than U_m. - New requirements for impulse waveshape (k factor) have been introduced.
- Tables of test levels have been merged and aligned with IEC 60071-1:2010.
- Additional test levels have been introduced for U_m > 800 kV.
- A new Annex E has been introduced, which sets out the principles used in assigning the tests, test levels and clearances in air.