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Additional info for Analysis and Design of Low-Voltage Power Systems: An Engineer's Field Guide
1 2. 2). 2 3. X Ploss 4:4 Law of conservation of energy Faraday's law Sine-wave voltages can be generated by the movement of windings in magnetic fields or vice versa. 3). 3 4. Faraday's law Principle of the transformer When a current varying in time passes through a coil, a magnetic field is produced. 4). 4 5. 5). This causes ohmic voltage drops in the primary winding and thermal losses in the iron core. The entire magnetomotive difference gives rise to a magnetic force, this in turn producing a leakage flux in the air gap between the windings.
2: 0,8±1 0,6 1 1 1 1 0,8 0,7 1 0,6±0,7 0,6±0,8 0,6±0,7 1 0,7±0,9 0,6±0,9 0,2±0,6 0,5±0,8 0,4±0,8 0,2±0,4 0,7 per crane Coincidence factors for important consumers Consumer groups Office buildings Hospitals Department stores Lighting Electrical outlets Kitchens Air conditioners Elevators, escalators 0,85±0,95 0,1±0,15 0,5±0,85 1 0,7±1 0,7±0,9 0,1±0,2 0,6±0,8 1 0,5±1 0,85±0,95 0,2 0,6±0,8 1 0,7±1 The apparent power of the network input can be calculated from the calculated Pmax and the average power factor cos j.
C. 3 Windings The windings are comprised of Cu or Al conductors with round or rectangular cross-section, such as laminations or foils. The windings are located on the coil form and are usually lacquer-insulated copper wire of circular cross-section. The windings are designated as follows: 1. 2. 4 Types 1. 2. 3. 4. C. C. 8). The core is connected through an upper 21 22 4 Transformers and a lower yoke, so that a closed magnetic circuit arises. The iron core is made of soft iron laminations which are isolated from each other (in order to minimize losses due to remagnetizing and eddy currents).