Questions about the installation of cables for power distribution in the plant

Personal advice, only when referenced:

Your transformer is 250kva, then the transformer output current is about 357A, and also consider the ambient temperature, the carrying capacity of a 185-square-meter copper core bx cable at 40 degrees Celsius is 428A.

Although the power of your machine will not exceed 100kw, but when the short circuit, the size of the short circuit current is related to the size of the wire, the capacity of the transformer, the distance between the short circuit point and the transformer, and the actual load power of your has nothing to do with it.

I sell cables The size also depends on your distance.

The copper core cable is a square meter distance, be careful of the loss).

Three-fire, one-zero, one-grounding, five-core cable.

VV 3*120+2*70 (general cable, economical) VV22 3*120+2*70 (steel belt armor, expensive, suitable for exposed use) The above is a distance of 100 meters, for reference only.

If what you said above is correct, you can consider that the power supply distance is not large, you can reduce it appropriately, and you can choose copper core power cable VV-3*120+2*70

It's too conservative, how can a private company have that Moduo money to invest in 95mm 2.

Go to the wire and cable network to check it.

1. The maintenance equipment and the operating equipment should be separated by obvious signs.

2. The secondary winding with current transformer and voltage transformer should have permanent and reliable protective grounding.

3. When working on the secondary circuit of the running current transformer, the following safety measures should be taken: in order to reliably short circuit the secondary coil of the current transformer, short-circuit pieces and short lines must be used, and wire winding is prohibited; It is forbidden to carry out any work on the circuits and wires between the current transformer and the short-circuit terminals.

4. When working on the secondary circuit of the voltage transformer in operation, the following safety measures should be taken: during the energizing test of the secondary circuit, in order to prevent the reverse voltage from the secondary side to the primary voltage, in addition to disconnecting the secondary circuit, the primary fuse or code should also be removed; Before the circuit is energized or the withstand voltage test, the attendant and relevant personnel should be notified, and someone should be sent to guard the scene, check the circuit, and confirm that no one is working before pressurization.

5. The staff who inspect the power-off protection and the secondary circuit are not allowed to carry out any reverse gate operation without the permission of the personnel on duty.

x0d\x0a3.Plan the cable laying route map (see Appendix 1), and arrange the deployment personnel in place according to the circuit diagram and the actual situation of the site. Arrange professional electricians to operate at the beginning and end of the cable or key parts, and other places will be operated by other non-electrical professionals, and the professional and technical personnel will be under the unified command on site.

x0d x0a4) The cable is carried by manual traction, and the porter should stand on the same side of the cable. When carrying cables, we must listen to the unified order, unify the pace, the speed should be uniform, and it is strictly forbidden to run. 5) When transporting vertically, the front end of the cable should be pulled by a rope to prevent the cable from falling suddenly and injuring people.

The cable in the cable tray should be stacked straight and neat, crossing, mixing and twisting are strictly prohibited, the bending arc should be consistent, and the cable bending radius should not be less than 10 times the cable diameter. X0D X0A9) After each cable is laid, there should be a special person at both ends of the cable for tagging. The cable label should indicate the cable specification, model, circuit number, and the distribution box number at the other end.

Answer: When laying cables in the main plant, attention should generally be paid to:

1) All control cables leading to the centralized control room should be laid overhead;

2) 6kV cables should be laid with tunnels or pipes, and high groundwater levels can also be laid overhead or with pipes;

3) 380V cable when the two ends of the cable at zero meters should be used to destroy the tunnel, ditch or pipe, when one end of the equipment is on the top, one end of the down, can be partially overhead laying, when the groundwater level is high, should be overhead.

The safety of this kind of thing is still very heavy, and all the standard pants must be up to standard, and you can be more assured to choose a regular brand, like Far East, on the cable, Mingda cable, etc. are not bad.