Summary
With the rapid development of China’s UHVDC transmission technology and complex contaminated environments, silicone rubber composite insulators endure severe contamination-leakage current coupling, and their tracking resistance is critical to power system safety. To reveal the differential effects of DC positive/negative polarities on silicone rubber tracking, this study conducted comparative experiments on insulator shed samples per
Read more Read lessGB/T6553-2014 (test parameters: 4.5 kV DC, 0.2 mL/min contaminant dropping rate), including 15 positive and 12 negative polarity groups.Key results: 14 positive polarity specimens failed (attributed to multi-channel arc competition and higher leakage current); 6 negative polarity specimens experienced delayed failure (2–6 h), characterized by progressive penetration of single/local conductive paths. SEM/EDS analyses showed positive polarity failed specimens had filler agglomeration and Fe elements (from electrode corrosion, increasing contaminant conductivity), while negative polarity specimens had uniformly dispersed filler.This study quantitatively reveals that positive polarity induces intense arcing and rapid failure, while negative polarity causes moderate delayed failure, providing a theoretical basis for revising polarity-related parameters in DC tracking test standards.
Additional informations
| Publication type | Session Materials |
|---|---|
| Reference | D1_11570_2026 |
| Publication year | |
| Publisher | CIGRE |
| Country | China, People's Republic of |
| Study committees | |
| File size | 580 KB |
| Price for non member | 30 € |
| Price for member | 30 € |
Authors
ZHOU Songsong - China Electric Power Research Institute Co., Ltd.; ZHANG Xing - North China Electric Power University; LIU Hechen - North China Electric Power University; DENG Yu - China Electric Power Research Institute Co., Ltd.; YU Jiahuan - China Electric Power Research Institute Co., Ltd.; SUN Dongxu - China Electric Power Research Institute Co., Ltd.; XU Shijie - North China Electric Power University
Keywords
