Bosch High-frequency production tools professional blue Page 52
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52 | High-frequency technology | Guide High-frequency technology A guide for the user Fig. 9: Fig. 10: Cable cross-section in relation to voltage and Cable cross-section in relation to frequency and power factor inductive resistance The heating of the cross-section determined in If the result at three-phase current from Fig. 8 and 9 is Fig. 8 is now checked. With the value of the power to a cross-section of over 10 mm2, then you go to Fig. 10 be transferred, you go from the left horizontally until with the exact ascertained value to take into consid- you meet the intersection with the line for the voltage, eration the inductive voltage drop. There you go up then down vertically until you meet the intersection vertically from the horizontal base line until you meet with the line for the power factor cos φ, and finally the intersection with the curve for the frequency and horizontally to the right where you can then read the then horizontally to the left or right. Of the cable cross-section depending on the type of cable. cross-sections ascertained, the larger one is authoritative for the rating of the cable. The inductive resistance takes particular effect when dealing with larger cable cross-sections. These are, in turn, required at low voltage or higher frequency. A power factor cos φ of 0.7 for the consumers has been made the basis for calculation of the curves of Fig. 10. In single-phase alternating current systems with a power factor cos φ = 1, the inductive resistance can also be disregarded for larger cable cross- Power to be transferred at three-phase current Fig. 9 Fixed laying Rubber hose line Three-phase current Direct current Single-phase alternating current sections.
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