Outdoor line construction method

Publish Time:2017/06/02 03:51 Author:admin Views:220 Origin:Site

Outdoor lines in the form of high-voltage overhead lines for power transmission, low-voltage overhead lines for power distribution, and cables for buried cables, cable trenches and cable tunnels, and cables for protection.

Construction of overhead power lines below 1.35 kV

Overhead power line installation procedures: digging pole and cable pit → foundation buried → pole combination → crossbar installation → insulator installation → pole → cable installation → wire erection.

Overhead power line poles set up after the cable installation and adjustment, before the conductor can be erection. Wire erection procedures: wire display → wire connection → tight line → insulator on the wire fixed and jumper connection.

Electric installation of electrical equipment should be solid and reliable, electrical connections should be close contact, different metal conductor connection should be transition measures, porcelain surface smooth and no cracks, no damage.

2. Line construction

Low-pressure overhead into the household pipe should adopt galvanized steel pipe, the nozzle should be equipped with waterproof elbow. The bolt at the home should be installed at the end of the building exterior decoration. The same loop of the phase line and the neutral line must be worn in the same inlet tube.

When the tie line erection, should be tied to the end of the rod, after the banding into the end.

3. Outdoor cable laying

The appearance of the cable and its accessories and the cable structure on-site inspection.

The cable must be tested for insulation resistance, DC withstand voltage and leakage current, and oil-filled cables. Buried cable laying requirements:

(1) cable buried depth from the ground should not be less than 0.7 m.

(2) to cross the other underground pipelines to maintain a specified distance, is strictly prohibited parallel laying in it, just below.

(3) should not be damaged by chemical, animal and man-made causes.

(4) artificial excavation cable trench, the ditch should be left on both sides of the slope to prevent landslides.

(5) The bending radius of the cable should not be less than the allowable bending radius of the cable.