cameroon gce advanced level 2025 design of electrical installation 2
cameroon gce advanced level 2025 design of electrical installation 2
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THEME: ELECTRICAL INSTALLATION OF A FACTORY
The factory has three workshops and offices as represented on the electrical line diagram as shown in figure 1. The factory is supplied with a three-phase transformer 15 kV/ 380 V- 50 Hz installed at the entrance of the factory.
I. Structure of the line diagram
Diagram showing the transformer and distribution to Workshop n°1, Workshop n°2, Workshop n°3, and Offices.
Figure 1: Line diagram of the installation
II. Load distribution
WORKSHOP N° 1
| Circuit -breaker | Supply line | Quantity | Designation | Characteristics |
| CB 1 | AA1 | 12 | 2P+T Socket-outlets | 220 V- 16 A |
| CB 1 | AA1 | 06 | 3P+T Socket-outlets | 380 V-20A; cos = 0.8 |
| CB2 | AA2 | 01 | 3-phase belt conveyor | Pu = 5.5 kW; = 0.8; cos = 0.75 |
| CB3 | AA3 | 04 | Auxiliary circuit lines | S = 40 kVA; cos = 0.8 |
| 01 | 3-phase hoist | Pu = 7.5 kW; = 0.86; cos = 0.8 | ||
| CB4 | AA4 | 01 | 3-phase rotative machine | Pu = 3 kW; = 0.88; cos = 0.8 |
| 01 | 3- phase screw conveyor motor | Pu = 4 kW; = 0.8; cos = 0.75 | ||
| CB5 | AA5 | 10 | Fluorescent mercury discharge lamp | 400 W – 220 V; cos = 0.8 |
| Power loss in the ballast is evaluated at 25% of the rated power |
