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Electrical cable design - Power cable conductor number deter

Release time:2016-04-26 10:26 hit:


Power cable conductor number
1. 1kV and below power supply neutral point direct grounding, cable core number with three-phase circuit, shall meet the following requirements:
 
(1) protection line and exposed conductive part connecting electrical equipment ground, shall comply with the following provisions:
 
1) Protecting line and neutral line share with same conductor, shall select four core power cable;
2) Protecting line and neutral line are independent, shall select five core cable; when meet this standard provision, also shall adopt four core cable and other protection line.
 
(2) The exposed electric equipment electrically conductive parts ground connection and power supply system grounding are independent, shall select four core power cable.
 
2. 1kV and below power supply neutral point direct grounding, the selection of single-phase circuit cable core number, shall meet the following provision:
 
(1) protection line and exposed conductive part connecting electrical equipment grounding, shall comply with the following provisions:
1) two core cables should be used when the protection line is combined with the neutral line.
2) when the protection line and the neutral line are independent, 3 core cable should be used, when meet this standard provision, also shall adopt two core cable and other protection line.
(2) electric equipment exposed conductive parts of the grounding and grounding power system independently, should use the two core cable.
 
3. 3 - 35kV three-phase power supply circuit of the cable core number selection, should comply with the following provisions:
 
(1) large working current loop or cable laying in the water, every time can choose 3 piece single core cables.
 
(2) except in the case, should choose the three core cable; three core cable can use ordinary turnkey type, can also be selected 3 single core cable stranding structure modeling.
 
4. 110kV three-phase power supply circuit, except that the deposited arranged on the lake and sea inferior places and little cable section can be used three core type, every time can choose three single core cables.
 
110kV and above three - phase power supply circuit, each shall use 3 single - core cable.
 
5. Electric railway and other high-voltage single-phase power supply circuit, two core cable should be used or every time choose 2 piece single core cables.
 
 
6. the choice of DC power supply circuit cable core number, shall be in accordance with the following provisions:
 
 
(1) low-voltage DC power supply circuit, should use the two core cable; also can choose single core cable.
 
(2) high voltage direct current transmission, appropriate selection of single core cable; in the lake and sea water installation, also can use coaxial two core cable.


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