Wire And Cable Knowledge(二）

1.What is the main electrical wiring

The main electrical wiring is the connection mode of the main electrical equipment and bus in power plant and substation, including the connection mode of the main bus and the plant 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 shall follow the following principles :(1) The rated voltage of the cables shall 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 shall be equal to or greater than the maximum continuous current of the power supply load; (3) the wire core section should meet the stability requirements of the power supply system in the case of 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 shall enable the protection device to operate reliably.

3.What are the advantages of XLPE cable compared with oil paper cable?

(1)Easy to install, because it allows a small minimum bending radius and light weight; (2) not subject to line drop *; (3) Good thermal performance, high allowable working temperature and large transmission capacity; (4) cable accessories are simple, all are dry structure; (5) Simple operation and maintenance, no oil leakage problem; (6) Low price; (7) High reliability and low failure rate; (8) Less manufacturing process, simple technology, remarkable economic benefits.