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Some Things You May Need To Know About Power Cables

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Some Things You May Need To Know About Power Cables

1. What Is Electrical Mains Wiring?


The main electrical connection refers to the way the main electrical equipment in power plants and substations is connected to the busbar, including the way the main busbar is connected to the auxiliary power system according to certain functional requirements.


2. What Regulations Should Be Followed When Selecting The Cross-Section Of Power Cables?

The selection of power cables should follow the following principles.

(1) The rated voltage of the cable should be greater than or equal to the rated voltage of the power supply system at the installation point.

(2) The continuous allowable current of the cable should be equal to or greater than the maximum continuous current of the supply load.

(3) The cross-section of the wire core should meet the stability requirements of the power supply system in the event of a short circuit.

(4) Check whether the voltage drop meets the requirements according to the cable length.

(5) The minimum short-circuit current at the end of the line should enable the protection device to work reliably.


3. What Inspection Work Should Be Carried Out Before Cable Laying?

(1) The bracket should be complete and the paint should be intact.

(2) The cable type, voltage, and specification meet the design requirements.

(3) The cable is well insulated. When the sealing of oil paper cable is in doubt, it should be judged to be damp; direct buried cable and small bottom cable should pass DC withstand voltage test; an oil sample of oil-filled cable should pass the test.

(4) The oil pressure of the oil-filled cable should not be less than 1.47mpa.


4. Where Should The Positioning Mark Of The Direct Buried Cable Be Set?

At both ends of the cable, at the 50-100m straight section of the cable, at the cable joints, and at the bend where the direction of the cable changes.


5. What Is The Function Of The Inner Sheath Of The Cable?

The insulation layer will not come into contact with water, air, or other objects to prevent moisture and mechanical damage to the insulation layer.


6. What Are The Main Properties Of The Insulation Material Of Power Cables?

It should have the following main functions.

(1) High breakdown strength

(2) low dielectric loss

(3) high insulation resistance

(4) Excellent anti-discharge performance

(5) a certain degree of flexibility and mechanical strength

(6) Long-term stability of insulating properties

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