How to choose suited cross-linked polyethylene (XLPE) insulating power cable?
Technical Data of cross-linked polyethylene (XLPE) insulating power cable (see table below)
|
CODE |
NAME |
APPLICATION |
|
|
Cu core |
Al core |
||
|
YJV |
YJLV |
(cross-linked polyethylene) XLPE insulating copper tape shielded PVC sheathed power cable |
For aerial, indoor, tunnel, cable trench, pipeline and underground Buried |
|
YJSV |
YJLSV |
(cross-linked polyethylene) XLPE insulating copper wire shielded PVC sheathed power cable |
|
|
YJV22 （ZR-YJV22） |
YJLV22 （ZR-YJLV22） |
(cross-linked polyethylene) XLPE insulating copper tape shield steel tape armored PVC sheathed (flame retardant or PVC sheathed) power cable |
Suitable for indoor, tunnel, cable trench and laying of underground buried cable can withstand external mechanical forces, but can not afford a big pull |
|
YJV32 |
YJLV32 |
(cross-linked polyethylene) XLPE insulating copper tape shield steel tape armored PVC sheathed power cable |
Suitable for buried underground, underwater shafts and laying the cable can withstand external mechanical forces and can withstand considerable tension |
|
YJSV32 |
YJLSV32 |
(cross-linked polyethylene) XLPE insulating copper shield thin steel wire armored PVC sheathed power cable |
|
|
YJV42 |
YJLV42 |
(cross-linked polyethylene) XLPE insulating copper tape shield thick steel wire armored PVC sheathed power cable |
Suitable for buried underground, underwater shafts and laying the cable can withstand external mechanical forces and can withstand greater tension |
|
YJSV42 |
YJLSV42 |
(cross-linked polyethylene) XLPE insulating copper wire shielded thick steel wire armored PVC sheathed power cable |
|
Basic requirements of choosing cross-linked polyethylene (XLPE) insulating power cable
1. Cable core temperature maximum operating current is applied, shall not exceed the allowable value of the continuous operating current loop cable core temperature must not exceed the permissible values listed in section 2.4 of Schedule that cross-linked polyethylene (XLPE) insulating power cable core maximum rated temperature is 90 ℃.
2. The maximum short-circuit current thermal effects produced by the role of time, should not undermine the continued use of the cable characteristics. For non-fuse protection circuit, according to the short-circuit current core temperature does not exceed a Linear Section 2.4 of the Schedule are allowable values, namely cross-linked polyethylene (XLPE) insulating power cable cores maximum temperature of 250 ℃.
3. Circuit connection is very long, the limits for voltage drop should not exceed the allowable value.
4. For longer distances large current loop or more than 35kV high-voltage cable, to meet the three requirements under the premise of economic current density law should press the selection line core cross section, namely the cable core cross section can be determined as follows
A=Iy·max/J
Wherein Y • max-- normal working hours maximum continuous operating current, A; J-- economic current density, A / mm2.
