南方电网技术2017，Vol.11Issue(8)：34-40,60,8.DOI:10.13648/j.cnki.issn1674-0629.2017.08.005
高压电缆外护层绝缘降低时护层保护器的参数配置
Sheath Protector Parameter Configuration of High Voltage Cable with Decreased Insulation
张煌 1黄嘉盛 2牛海清 1郭然1
作者信息
- 1. 华南理工大学电力学院,广州510640
- 2. 广州供电局有限公司,广州510310
- 折叠
摘要
Abstract
Considering the universally decreased insulation resistance of high voltage cable sheath and the possibility of its decreased withstand voltage level, the paper studies whether the protector can act correctly without damage to protect the sheath with decreased insulation under lightning overvoltage, operation overvoltage and short circuit when configuring protectors with low voltage-current characteristics by establishing ATP-EMTP simulation models of single-ended grounding and crossbonding grounding.The results show that reducing the voltage-current characteristics of protector can reduce the residual voltage acting on the outer sheath, and the current flowing through the protector is still below its nominal discharge current;in the case of single-phase short circuit, under the condition of single-end grounding, the protector needs to absorb a large amount of short circuit energy, reducing the voltage-current characteris-tics will lead to protector explosion;under the condition of crossbonding grounding, whether the protector explode or not depends on the magnitude of short circuit current, while a larger short-circuit current will cause the protector to explode.Finally, suggestions of the protector configuration of the outer sheath with decreased insulation are proposed.关键词
高压电缆/护层保护器/外护层/参数配置/绝缘降低Key words
high voltage cable/sheath protector/outer sheath/parameter configuration/decreased insulation分类
信息技术与安全科学引用本文复制引用
张煌,黄嘉盛,牛海清,郭然..高压电缆外护层绝缘降低时护层保护器的参数配置[J].南方电网技术,2017,11(8):34-40,60,8.
