ICS 29.080.10 CCS K 48 备案号： 63049-2018 中华人民共和国电力行业标准 DL/T 557—2021 代替 DL/T 557—2005 高压线路绝缘子空气中冲击击穿试验 定义、试验方法和判据 Impulse puncture tests in air on insulators for overhead lines — Definitions, test methods and acceptance criteria (IEC 61211 ：2004 Insulators of ceramic material or glass for overhead lines with a nominal voltage greater than 1000 V — Impulse puncture testing in air, MOD) 2021-12-22 发布 2022-06-22 实施 国家能源局 发 布 《电子编加稿件》 XM90423 责编：郭丽然 成品： 210*297 责校：王海南 版心： 166*238 字数： 45*43行 天35 地 24 订 24 切 20 描图： 9张 DL/T 557—2021 I 目 次 前言 ······························································································································· ···································· II 1 范 围 ······························································································································· ······························· 1 2 规范性引用文件 ······························································································································· ··········· 1 3 术语和定义 ······························································································································· ··················· 1 4 试验要求 ······························································································································· ······················· 2 4.1 一般要求 ······························································································································· ················ 2 4.2 试品安装方式 ······························································································································· ········ 2 4.3 试品数量 ······························································································································· ················ 3 4.4 试验程序 ······························································································································· ················ 3 4.5 试验电压 ······························································································································· ················ 4 4.6 击穿的判定 ······························································································································· ············ 5 4.7 接受判据 ······························································································································· ················ 5 5 试验电压的产生和测量 ······························································································································· 5 5.1 试验用冲击电压发生器 ························································································································ 5 5.2 试验电压的测量 ······························································································································· ···· 5 附录 A （规范性） 盘形悬式绝缘子－ U50的推荐值 ····················································································· 7 附录 B （资料性） 本文件部分章条与 IEC 61211 ：2004章条编号对照 ····················································· 8 附录 C （资料性） 本文件部分条款与 IEC 61211 ：2004技术差异及其原因 ············································· 9 DL/T 557—2021 II 前 言 本文件按照 GB/T 1.1 —2020《标准化工作导则 第 1 部分：标准化文件的结构和起草规则》的规 定起草。 本文件代替 DL/T 557 —2005《高压线路绝缘子空气中冲击击穿试验 定义、试验方法和判据》 。本 次修订是在总结涂覆 RTV 的盘形悬式绝缘子空气中冲击击穿特性研究成果的基础上，结合我国涂覆 RTV防污闪涂料的盘形悬式绝缘子的工程实际，对文件进行修订。与 DL/T 557 —2005相比，除结构调 整和编辑性改动外，主要技术变化如下： a） “术语和定义”中， “冲击击穿电压”修改为“冲击击穿耐受电压” ； b） 在“试验要求”中，增加了涂覆 RTV防污闪涂料的盘形悬式绝缘子的试验电压要求（ 4.5.1）； c） 附录 A 中增加 420 kN、550 kN 三层伞盘形悬式绝缘子的－ U50规定值，修改了部分产品规格 的－ U50规定值。本文件修改采用 IEC 61211 ：2004《标称电压高于 1000 V 的架空线路盘形悬 式瓷或玻璃绝缘子 空气中冲击击穿试验》 （Insulators of ceramic mate rial or glass for overhead lines with a nominal voltage greater than 1000 V — Impulse puncture testing in air ）。 本文件与 IEC 61211 ：2004相比的技术差异见附录 C。为便于使用，本文件还做了以下编辑性修改： a） “本国标准”一词改为“本文件” ； b） 用