HNC Electrical Engineering Essay Example | Topics and Well Written Essays - 1500 words

HNC Electrical Engineering - Essay Example Fortescue, who introduced the method around 1918.....(1) However, it remained difficult to understand the three-phase system working under this concept, as any change in the voltage or current in any single phase could result in the corresponding changes in other two phases as well. Therefore, only two-phase alternating current was used in the power systems and it had 90-degree difference between the phases.(2n) Hence the two-phase power-generating concept was developed. However, we have evidence of using two-phase generators by connecting two single-phase ones, as early as 1890s........(2) In simpler terms, three-phase power system is the one that uses three different wires. One wire can be a neutral cable, which facilitates the system to use higher voltages while transmitting low voltages in domestic appliances. However, those machines that use high voltage allocations, the neutral cable requirement is not there as negligible loads are connected between the phases. In three phase power systems the power load is well distributed, as all the three wires have same magnitude of current with balance power load. Most of the countries have their own color-coding of the wires to distinguish the same in case of repairs. The three-phase power system is the widely used power in all industries, as it has balanced power load with uniform phase angle difference. However, the requirement of the household appliances and applications can be met with the single or two-phase systems as well. All electric motors are the fine example of three-phase power usage, as a three phase induction motor runs efficiently and has high starting torque with trouble-free design. The application of such motors can be found in fans, blowers, compressors etc. While these are medium and large size motors, application of very small three phase motors can be found in computer fans etc. The main advantage