Calculation of power supply and selection of electrical equipment of the welding section of the workshop

Coursework

Calculation of  power supply and selection of electrical equipment of the welding section of the workshop.

         1 Characteristics of the welding section of the workshop

         The welding section (SU) is designed for preparatory work with products. They are part of a large machine shop of a heavy engineering plant.

          At the welding site, manual electric arc welding and cladding, semi-automatic and automatic impulse cladding under a layer of flux, etc. are provided for various purposes.

          It is equipped with electrical installations (PP): thermal, welding, ventilation, as well as metalworking machines.

           Transport operations are carried out with the help of a crane-beam, an electric hoist, ground electric trolleys, belt conveyors.

            The site has a mechanical, thermal compartment, welding posts, a department of impulse cladding, where the main equipment is placed.

            Power supply (ESP) is provided from the shop transformer substation (TP) 10/0.4 kV, located at a distance of 50 m from the site building. In the future, the same TP provides for the ESP of the machine section with an additional load (P = 800 kW; cosφ = 0.85; Kn = 0.6)

             Electrical receivers that provide vital activity (ventilation and air conditioning) belong to the 2nd category of reliability of the ESP, and the rest - to 3. Number of working shifts – 2.

The soil in the area of the workshop is sand at tº + 12 º C. The frame of the building is constructed of blocks - sections with a length of 8, 6 and 4 m each.

Workshop dimensions AxBxH = 48х30х8 m 

All rooms, except the mechanical compartment, are two-storey with a height of 3.6 m

The list of EO of the welding section  shop is given in Table 3.16

Power consumption (Ep) is indicated for one electrical receiver.