Scope of application:
Apply to extruded insulated power cable with U0≤27.5kV
—Single-core, three-core cables
—Copper or aluminum conductor
—Extruded semi-conductive shield layer or semi-conductive tape shield
—Metal tape shield or metal wire shield
—Armoured or unarmoured
—Metal tape armoured or metal wire armoured
Application:
Indoor terminal: It is installed at the end of the cable running in the indoor environment (not exposed to wind, frost, rain, snow and sunlight), connected to power supply devices such as switchgear and transformer or busbar.
Outdoor terminal: It is installed at the end of the cable running in the outdoor environment (can withstand wind, frost, rain, snow and sunlight), connected to power supply devices such as overhead cable, busbar, transformer and fuse or overhead cable.
Straight-through joint: It is installed in the middle of a running cable, used to connect two sections of cable lines.
Technical Parameter：
|
Confirm to and pass GB/T12706.4-2020 rated voltage 1kV (Um=1.2kV) to 35kV (Um=40.5kV) extruded insulated power cable and accessories part four: rated voltage 6kV (Um=7.2kV) to 35kV (Um=40.5kV) power cable accessories testing requirements and GB/T28427-2012 electrified railway 27.5kV single-phase cross-linked polyethylene insulated cable and accessories 1. |
| Serial Number | ltem | Standard Parameter Value |
| 1 |
Power frequency withstand voltage test |
124kV, 5 min, no breakdown, no flashover |
| 2 |
Direct-current withstand voltage test |
110kV, 15 min, no breakdown, no flashover |
| 3 |
Partial discharge test |
Discharge is not greater than 5pC at 48kV |
| 4 |
Impulse voltage test |
250kV, 10 times each for positive and negative polarity |
| 5 |
Constant voltage load cycle |
65kV, heated to 95-100℃, keep stable for 2 hours and circulate 3 times |
| 6 |
Power frequency withstand voltage test |
110kV, 4h, no breakdown, no flashover |
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