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| Name： |
1kv Overhead Cable |
| Note： |
2.2 Standard
GB14049－93 and enterprise standard.
2.4 Construction
2.5 Characteristics
* AC rated voltage U(Um) is 10 (12)kV or 35 (42) kV. The cables can be used in systems where each single earth failure time is not more than 1 min. They are also can be used in systems where the maximum earth failure time is not more than 8h and accumulated earth failure time is not more than 125h.
* Ambient temperature of installation is not lower than －20℃.
* Max. temperature of cable in case of short circuit (Max. duration is not more than 5s):
－ XLPE: 250℃
－ HDPE: 150℃
* Max. permissible long-term operation temperature of cable:
－ XLPE insulation: 90℃
－ HDPE insulation: 75℃
* Bend radius:
Single core cable － ≮ 20（D＋d）
Multi-core cable: － ≮15（D＋d）
D － outer diameter of cable, mm
d – outer diameter of conductor, mm
* Insulation resistance test
Immerse the drum with cable in water at room temperature at lest 1h, then apply DC voltage 80-500V and keep it stabilize 1-5min. The tested insulation resistances shall be as follows:
－ 10kV cable: ≮1500 MΩ.km.
－ Light cable with thin insulation: 1000 ≮MΩ.km
－ 35kV cable: ≮ 4100 MΩ.km
* AC Voltage Test
Immerse the drum with cable in water at room temperature at lest 1h, then apply test voltage 1 min, the cable shall be not breakdown. The test voltages shall be as follows:
－ 10kV cable: general type－18kV， light type－12kV
－ 35kV cable: 63kV
* Partial Discharge Test
The partial discharge value of 3-core 10kV overhead cable with insulation screen: ≯20pC
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