物理高发泡聚乙烯绝缘电缆
一、电缆结构尺寸
型号SYWV(Y)-75 | -5 | -7 | -9 | -12 |
内导体直径 mm | 1.00±0.02 | 1.66±0.02 | 2.15±0.03 | 2.77±0.03 |
绝缘体直径 mm | 4.80±0.20 | 7.25±0.25 | 9.00±0.25 | 11.50±0.30 |
外导体外径≤mm | 5.80 | 8.30 | 10.30 | 12.80 |
护套直径≤mm | 7.5 | 10.60 | 12.60 | 15.40 |
参考重量 kg/km | 43 | 70 | 80 | 120 |
二、电缆电气性能
型号SYWV(Y)-75 | -5 | -7 | -9 | -12 | |
绝缘电阻 MΩ·Km | 10000 | 10000 | 10000 | 10000 | |
缆芯介电强度 KV | 1.6 | 1.6 | 1.6 | 1.6 | |
护套介电强度 KV | 火花 | 3 | 5 | 8 | 8 |
浸水 | 2 | 3 | 5 | 5 | |
电容 PF/m | 52 | 52 | 52 | 52 | |
特性阻抗 Ω | 75.0±3.0 | 75.0±2.5 | 75.0±2.5 | 75.0±2.5 | |
回波损耗(dB)min | VHF | 20 | 20 | 20 | 20 |
UHF | 18 | 18 | 18 | 18 | |
衰减常数 dB/100m max | 50MHz | 4.8 | 3.2 | 2.4 | 1.9 |
200MHz | 9.7 | 6.4 | 5.0 | 3.9 | |
300MHz | 11.9 | 7.9 | 6.2 | 4.8 | |
450MHz | 14.5 | 9.7 | 7.6 | 5.9 | |
550NHz | 16.8 | 10.7 | 8.5 | 6.7 | |
750MHz | 19.7 | 12.9 | 10.1 | 7.9 | |
800MHz | 20.3 | 13.3 | 10.4 | 8.2 | |
860MHz | 21.0 | 13.8 | 10.8 | 8.5 | |
1000MHz | 22.7 | 14.9 | 11.7 | 9.2 |