A 400KV single busbar substation with 4 outgoing feeders is protected by a high impedance differential protection system with 1200/1 CTs. The maximum and minimum fault levels are 10000 MVA and 5000 MVA, respectively. The winding resistance. knee-point voltage (Vknee) and knee-point excitation current (Iknee) of the CTs are 1.22, 160V and 160mA, respectively. The coil resistance and operation current of the relay are 1.5N and 0.3A, respectively. The maximum loop resistance of the lead connecting the CT and the relay is 1.32. Determine suitable voltage setting and stabilizing resistors (both series and shunt (if necessary)).

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Three-Phase Transformers

Three-segment transformers are a type of transformer used to transform voltages of electrical systems into three ranges. Two type transformers are shell-type transformer and core type transformer. In brief, it could be described because of the exquisite kinds of configurations.

Transformer

Ever since electricity has been created, people have started using it in its entirety. We see many types of Transformers in the neighborhoods. Some are smaller in size and some are very large. They are used according to their requirements. Many of us have seen the electrical transformer but they do not know what work they are engaged in.