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Additional resources for Analysis and Design of Low-Voltage Power Systems: An Engineer's Field Guide
8 Efficiency of Transformers The magnetic or iron core losses consist of the hysteresis and eddy current losses in the iron core and in the dielectric material. These losses are independent of the loading. The short circuit losses are made up of the ohmic losses in the windings. The winding losses increase in proportion to the square of the load. 32) 2 A transformer has its maximum efficiency at a load for which P0 n Pk . 9 Protection of Transformers . Protection against internal faults 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). C. 2 Principle of Operation The transformer effect is based on Faraday's law. An alternating voltage U1 produces an alternating current I1 which flows in the primary winding. I1 then produces an alternating field.
Circuit documentation Power economics law Supply service Concrete-footing grounding electrodes In practice we can speak of the following cases: Case I: 1. The short circuit power is known or can be obtained from the power supplier. 2. The power and the short circuit voltage of the transformer are given. 3. The consumers and the connection locations are known. 4. The coincidence factor is given or can be taken from the tables. 5. It is therefore possible to calculate the cross-section of the main line,the short circuit currents and the voltage drops.
Analysis and Design of Low-Voltage Power Systems: An Engineer's Field Guide by Ismail Kasikci