QGDW11674.4-2024高压直流工程成套设计规程第4部分：过电压与绝缘配合

ICS 29.240.10 CCSF 21 备案号：68965-2019 国家电网有限公司企业标准 Q/GDW 11674.4—2024 代替 Q/GDW11909 —2018，Q/GDW10144 —2019 高压直流工程成套设计规程 第 4 部分：过电压与绝缘配合 SystemdesignstandardforHVDCprojects— Part4:Overvoltageandin sulationcoordination 2024-12-31 发布 2024-12-31 实施 国家电网有限公司 发布 Q/GDW 11674.4—2024 目 次 前言 ····························································································································· Ⅲ 1 范围 ························································································································· 1 2 规范性引用文件 ·········································································································· 1 3 术语和定义 ················································································································ 1 4 符号和缩略语 ············································································································· 3 4.1 符号 ·················································································································· 3 4.2 缩略语 ··············································································································· 3 5 高压换流站的过电压保护 ································································································· 4 5.1 过电压保护的主要措施 ·························································································· 4 5.2 避雷器的布置和功能 ····························································································· 4 5.3 避雷器参数的选择 ································································································ 7 6 高压换流站过电压 ······································································································ 10 6.1 过电压研究方法 ·································································································· 10 6.2 交流侧过电压 ····································································································· 11 6.3 直流侧过电压 ····································································································· 11 7 避雷器应力 ··············································································································· 15 7.1 交流母线避雷器（A 型避雷器） ············································································· 15 7.2 阀避雷器（V1、V2、V3 型避雷器） ········································································ 16 7.3 上、下12 脉动换流单元中间母线避雷器（CBL2 型避雷器） ········································· 18 7.4 平波电抗器阀侧直流母线避雷器（CBH 型避雷器） ···················································· 18 7.5 高电位换流变阀侧避雷器（A2 型避雷器） ································································ 18 7.6 12 脉动换流单元中间母线避雷器（MH、ML、M 型避雷器） ········································ 18 7.7 中性母线平波电抗器阀侧避雷器（CBN2、CBN1 型避雷器） ········································ 19 7.8 中性母线避雷器（E 型避雷器） ·············································································· 19 7.9 金属回线避雷器（EM 型避雷器） ··········································································· 19 7.10 接地极线路避雷器（EL 型避雷器） ······································································· 19 7.11 平波电抗器避雷器（DR 型避雷器） ······································································· 20 7.12 A’型避雷器 ······································································································· 20 8 换流站绝缘配合 ········································································································· 21 8.1 确定要求的耐受电压（Urw） ·················································································· 21 8.2 确定额定耐受电压 ······························································································· 22 8.3 确定直接保护的设备的裕度系数 ············································································· 22 8.4 直接保护的设备及其保护的避雷器 ·········································································· 23 9 换流站直流侧最小空气间隙 ·························································································· 24 10 直流线路过电压与绝缘配合 ························································································· 25 10.1 直流线路绝缘水平的确定 ····················································································· 25 10.2 直流线路缓波前过电压 ························································································ 25 10.3 直流线路快波前过电压 ························································································ 25 I