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Electrical Calculations and Guidelines for Generating Station and Industrial Plants by Thomas E. Baker

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5

Electrical Apparatus Calculations

This chapter presents miscellaneous electrical apparatus calculations that have not been covered in the proceeding chapters. The calculations and text are useful for electrical engineers engaged in support of operations, maintenance, and betterment projects for generating stations and other industrial plants.

5.1  Buses

Buses need to be able to withstand short circuit currents from external or through faults without damage or loss of life. In addition to thermal withstands, they need to be supported in a manner to handle the magnetic bending forces that occur from high magnitude short circuit currents. Figure 5.1 shows the formulas for calculating peak forces for horizontal bus bars only. The calculation ...

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