The high-impedance protection scheme includes the CTs with a high impedance to force the error differential current through the CTs instead of the relay-operating coil. The basic principles are shown in Figure 2. During the external fault condition, the maximum voltage VR
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The damage to transformers from through fault can be the result of both thermal and mechanical effects, which are a significant cause of transformer failure. Therefore, the overcurrent protective devices such as fuses and 50/51 relay shall have the well-defined operating characteristics
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