绝缘配合.第1部分:定义、原则和规则

[中文适用范围]： 国际标准IEC 71的本部分适用于设备最高电压高于1 kV的三相交流系统。它规定了设备和这些系统的安装的相对地、相间和纵向绝缘标准耐受电压的选择程序。它还给出了应从中选择标准耐受电压的标准化值列表。本部分建议所选耐压应与设备的最高电压相关。该关联仅用于绝缘协调目的。本标准不涉及人体安全要求。虽然本部分的原理也适用于输电线路绝缘，但耐压值可能与标准耐压不同。设备委员会负责考虑本标准的建议，规定适用于相关设备的耐受电压和测试程序。注 - 在 IEC 71-2 应用指南（修订中）中，本标准中给出的所有绝缘协调规则均经过详细论证，特别是标准耐受电压与设备最高电压的关联。当多于一组的标准耐压与设备的同一最高电压相关时，将为选择最合适的一组提供指导。 [外文原描述]： IEC 60071-1:2006 applies to three-phase a.c. systems having a highest voltage for equipment above 1 kV. It specifies the procedure for the selection of the rated withstand voltages for the phase-to-earth, phase-to-phase and longitudinal insulation of the equipment and the installations of these systems. It also gives the lists of the standard withstand voltages from which the rated withstand voltages should be selected. This standard recommends that the selected withstand voltages should be associated with the highest voltage for equipment. This association is for insulation co-ordination purposes only. The requirements for human safety are not covered by this standard. Although the principles of this standard also apply to transmission line insulation, the values of their withstand voltages may be different from the standard rated withstand voltages. The apparatus committees are responsible for specifying the rated withstand voltages and the test procedures suitable for the relevant equipment taking into consideration the recommendations of this standard. NOTE: In IEC 60071-2, Application Guide, all rules for insulation co ordination given in this standard are justified in detail, in particular the association of the standard rated withstand voltages with the highest voltage for equipment. When more than one set of standard rated withstand voltages is associated with the same highest voltage for equipment, guidance is provided for the selection of the most suitable set. The main changes from the previous edition are as follows: - in the definitions (3.26, 3.28 and 3.29) and in the environmental conditions (5.9) taken into account clarification of the atmospheric and altitude corrections involved in the insulation co-ordination process; - in the list of standard rated short-duration power frequency withstand voltages reported in 5.6 addition of 115 kV; - in the list of standard rated impulse withstand voltages reported in 5.7, addition of 200 kV and 380 kV; - in the standard insulation levels for range I (1kV < Um ≤ 245 kV) (Table 2) addition of the highest voltage for equipment Um = 100 kV; - in the standard insulation levels for range II (Um ≤ 245 kV) (Table 3) replacement of 525 kV by 550 kV and of 765 kV by 800 kV; - in order to remove that part in the next revision of IEC 60071-2, addition of Annex A dealing with clearances in air to assure a specified impulse withstand voltage in installation; - in Annex B, limitation at two Um values for the values of rated insulation levels for 1kV < Um ≤ 245 kV for highest voltages for equipment Um not standardized by IEC based on current practice in some countries. It has the status of a horizontal standard in accordance with IEC Guide 108 .