33kv XLPE Insulated PVC Sheatd Underground Medium Voltage Power Cable Swa

33kV 30KV 22KV 20KV XLPE  Insulated PVC Sheatd Underground Medium Voltage Power Cable

 

1 Application:

 It is used to transmit and distribute power in power transmission and distribution systems of 35kV or lower. It is generally applied to the fields including power, construction, mines, metallurgy, petrochemical industry and communication in complete replace of oil immersed paper insulated power cable and in partial replace of PVC insulated power cable. Power cables for power networks, underground, outdoors and in cable ducting.

Standard: BS6622, BS EN/IEC 60228,IEC60502.2
Conductor: Class 2 stranded plain copper conductor to BS EN 60228:2005 (previously BS6360)
Conductor screen: Semiconducting material
Insulation: XLPE (Cross-Linked Polyethylene) Type GP8 to BS7655
Insulation Screen: Semi-conducting material
Metallic Screen: Individual and overall copper tape screen to BS6622
Filler: PET (Polyethylene Terephthalate) fibers
Separator: Binding tape
Bedding: PVC (Polyvinyl Chloride) Type TM1 to BS7655
Armoring:

Single Core: Aluminium Wire Armoured (AWA)

MultiCore: Steel Wire Armoured (SWA)
Sheath: PVC (Polyvinyl Chloride) Type TM1 to BS7655
Colour: Red or Black

2. Using features

1. Rated voltage: Uo/U:3.6/6kV, 6/10kV(11kV), 12/20kV(24kV), 19/33kV, 26/35kV(35kV).
2. No. of core: Single-core or three cores.
3. The highest allowed operating temperature of conductor for long-term working is 90oC. In short-circuit (Max. long-term is no more than 5 seconds). The highest temperature for a conductor is no more than 250ºC.
4. D.C. resistance of the conductor complies with the stipulations of 3.6/6kV, 6/10kV(11kV), 12/20kV(24kV), 19/33kV, 26/35kV(35kV).
5. The environment temperature should be no lower than 0oC when lay. Otherwise, it should be preheated.
6. The cable is laid without a horizontal drop limit.
7. Working Frequency Voltage Test: 3.5Uo/5min without puncture.
8. Partial Discharge Test: The discharge volume should be no more than 10pC under 1.73Uo for the cable.
9. Minimum Bending Radius: Single core – Fixed: 15 x overall diameter;3 core – Fixed: 12 x overall diameter
(Single core 12 x overall diameter and 3 core 10 x overall diameter where bands are positioned adjacent to joint or terminations provided that the bending is carefully controlled by the use of a former)
Note: The single-core armored cables are used for the D.C. system only. If used for the A.C. system, the magnetic isolation should be applied to the steel armor wires of non-magnetical materials that should be used.

3 Operating characteristics

– Rated power-frepuency voltage U0/U: 3.6/6kv~26/35kv.

– Max.admissible operating temperature of the conductor:90ºC.

– Max. short-circurt temperature of conductor shall not exceed 2500C. (5s maximum duration)

– The ambient temperature under installation should not below 00C.

– The bending radius of a single-core cable should not less than 20 times of the cable diameter. 

The bending radius of a multi-core cable should not less than 15 times of the cable diameter. 



4 Table of the voltage, cores and cross-section

The cable with Category A rated voltage is used in the situation requiring not over 1 min. of grounding fault lasting time. For the cable with Category B rated voltage, the grounding fault lasting time normally is not over 1 hour, max. lasting time is not over 8 hours, annual ground fault lasting time altogether should not be over 125 hours, Category C includes all the system expect Category A and B.



5 Type and Name