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<p style="text-align:justify"><span style="font-size:14px">As seen in figure 6.1, a power system consists of many equipments (e. g. generators, transformers, transmission lines, busbars etc.), it is divided into number of protective zones for the purpose of protecting it. The zones of protection must overlap so that there is no blind spot which is not protected. Figure 6.3 (a) shows the overlapping of zones. These zones are decided by location of current transformers as shown in figure 6.3 (b).</span></p>