International Electricity Supplies


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International Electricity Supplies
International Electricity SuppliesAlternating current is normally distributed either through 3-phase wye (star) or delta (triangle), 4-wire secondary distribution systems. In the wye or star distribution system, the nominal voltage examples are 208/120, 220/127, 380/220 and 400/230 V. The higher voltage is 1.732 (the square root of 3) times the lower voltage. In a delta or triangle system, 220/110 and 460/230 V are examples of nominal voltages. The higher voltage is always double the lower voltage. The higher voltage is obtained by using 2- or 3-phase wires while the lower voltage is the voltage between the neutral wire (mid-point) and one-phase wire. The higher voltage may used for big loads while the lower voltage is used primarily for lighting and for small appliances. The nominal supply voltages and frequencies for co…
Citation
Amarjit Singh Pabla: Electric Power Distribution, Sixth edition. International Electricity Supplies, Chapter (McGraw-Hill Professional, 2011), AccessEngineering Export