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HOME >> products >>127/220kV XLPE insulated power cable

127/220kV XLPE insulated power cable

127/220kV XLPE insulated power cable
Product name : 127/220kV XLPE insulated power cable
Item : YJA02 & YJA03
Details :
127/220kV cross-linked polyethylene insulated power cable
Product standard: GB/Z 18890、GB/T 22078、IEC62067

Properties:

Maximum rated temperature:
1.Long-term maximum allowable operating conductor temperature: 90℃
2.Maximum operating temperature under short-time overload :105℃
3.Maximum operating temperature under short circuit (short circuit duration 5 s):250℃
 
Installation Requirements:
Cable laying shall not be restricted by drop height; the ambient temperature for laying shall not be lower than 0℃, and if the ambient temperature is lower than 0℃, the cable shall be pre-heated.
 
Minimum bending radius of cable
During cable laying: 20 Do; and Permanenrt installation: 15 Do
Note: Do is measured outer diameter of cable.
 
Maximum allowable axial traction for cable installation, T (radial side pressure at bend not being considered)
Conductor: T = K X Conductor Section (kg)
Where, The Coefficient K = 7 Kg/mm² For Copper Conductor And 4 Kg/mm² For Aluminum Conductor.
 
Maximum allowable side pressure when cable is bent, P
P = T/R ≤ 500 (kg/m),where T is axial traction, and R is bending radius.
 
Expression method for rated voltage of cable
The rated voltage of cable is expressed with U0 / U (Um),and it is an effective value with a unit of kV.For example,U0 / U (Um)=127/220(252).
U0: The rated power frequency voltage between the conductor and the shield or the metal armor,used for cable design;
U  : The rated power frequency voltage between the conductors,used for cable design;
Um:The maximum voltage of equipment (the maximum value of system voltage of the equipment in use).

Type and name:
YJA02:Copper core Cross-linked polyethylene insulated,aluminum-plastic composite sheath and polyvinyl chloride sheathed power cable
YJA03:Copper core Cross-linked polyethylene insulated,aluminum-plastic composite sheath and polyethylene sheathed power cable
 
Note:
1. Corrugated aluminum sheath includes two types, extruded corrugated aluminum sheath and welded corrugated aluminum sheath, both of which the code is LW based on JB/T5268.1. Welded corrugated aluminum sheath shall be clearly indicated in product names; and if no "welded" is shown in a product name, the corrugated aluminum sheath is extruded corrugated aluminum sheath.
2.    For flame-retardant power cable, "Z(ZA-,ZB-, ZC-)"is added before the above type number; for halogen-free low-smoke flame-retardant power cable,"WDZ (WDZA-, WDZB-, WDZC-)" is added before the above type number; for low-smoke low-halogen flame-retardant power cable, "DDZ (DDZA-, DDZB-,DDZC-)" is added before the above type number; and for anti-termite power cable, "FY-" is added before the above type number.
3.    For intelligent on-line temperature monitoring cable, "DFTS-" is added before the above type number.

Schematic diagram:
Mode:YJLW SERIES


Cable running state and parameters
1. Current carrying capacity is calculated according to standard IEC60287;
2. For single circuit, the inter-phase centre-to-centre distance is 250mm in parallel arrangement and is the outer diameter of cable in trefoil formation, and the operating temperature of conductor is 90℃;
3. Metallic screen grounding method: single end grounding or cross-bonded both end grounding;
4. In air: The air temperature is 40℃, protected from direct solar radiation;
5. Directly buried: The air temperature is 25℃, the thermal resistivity of soil is 1.2℃·m/W,and the buried depth is 1 m;
6. The short circuit current is calculated according to IEC949 (under thermal insulation condition). The short circuit starting temperature: conductor 90℃, metal sheath 80℃; the short circuit ending temperature: 250℃; the short circuit duration: 1 second.

Main structural parameters:
Voltage class: 127/220kV   
Mode:YJA02   YJA03


Main electrical parameters:

Note; The cross-sectional area of copper wire shield is assumed as 150mm², and different cross-sectional areas of copper wire shield can be provided according to customer requirements

Reference value of continuous current carrying capacity:
 
 
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