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<p style="text-align:justify"><span style="font-size:14px"><strong>Figure 7.41 shows a single line diagram of portion of a key one-line diagram of a thermal power plant. The fault current at 6.6 kV bus is 11.7 kA and that at 415 V bus is 42.83 kA. Assume that the minimum operating time of IDMT relays used beyond PSM equal to 20 is constant at 2.3 seconds at TMS equal to 1.0. P. S. of phase relay R<sub>3</sub> shall be set at</strong></span></p>

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