Cable sheath protector
Due to electromagnetic induction, the metal shielding layer (or metal sheath) of long line high-voltage single core power cables generates induced voltage, which leads to aging of insulation and reduction of insulation grade, resulting in reduced cable life. Once the induced voltage exceeds the sheath breakdown voltage, the outer sheath is broken down, forming a multi-point grounding fault of single core cables.
Due to electromagnetic induction, the metal shielding layer (or metal sheath) of long line high-voltage single core power cables generates induced voltage, which leads to aging of insulation and reduction of insulation grade, resulting in reduced cable life. Once the induced voltage exceeds the sheath breakdown voltage, the outer sheath is broken down, forming a multi-point grounding fault of single core cables. Therefore, the power industry standard DL/T401 Guide for Selection of High Voltage Power Cables stipulates that cable sheath protectors must be used to limit the induced voltage and fault overvoltage on power cables, metal shielding layers (or metal sheaths).
□ Product model description
LXQ- □□
| |______ Voltage level
|______________ Cable protector
| 型号 | 系统额定电压 Kvr.m.s | 工频耐压/时间Kvr.m.s | 10kA雷电冲击电流下的残压≤kvp | 直流参考电压 | 2ms方波通流容量A | L | 0.75U1mA下的泄漏电流≤μA | 目前市场上流通的未按国家行标JB/T8459标注的型号 |
|---|---|---|---|---|---|---|---|---|
| LHQ-6 | 6 | 1．9/4 | 4．6 | 2.1 | 400 | 80 | 50 | BHQ、BYL、FBY、SHQ、BYLS、TBP-h |
| LHQ-10 | 10 | 3．6/4 | 8．7 | 4.0 | 400 | 107 | 50 | |
| LHQ-35 | 35 | 5/4 | 12 | 5.5 | 400 | 134 | 50 | |
| LHQ-110(Ⅰ) | 110 | 5．3/4 | 12 | 5.8 | 400 | 188 | 50 | |
| LHQ-110(Ⅱ) | 110 | 10/4 | 25 | 11.0 | 400 | 188 | 50 | |
| LHQ-220(Ⅰ) | 220 | 6/4 | 15 | 6.5 | 400 | 188 | 50 | |
| LHQ-220(Ⅱ) | 220 | 13．6/4 | 31 | 15.0 | 400 | 188 | 50 | |
| LHQ-500 | 500 | 7．5/4 | 18 | 8.3 | 400 | 134 | 50 |
