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<p style="text-align:justify"><span style="font-size:14px">Figure 6.15 shows a single line diagram of a small power plant of an industry. Relay R is a voltage-controlled overcurrent relay giving normal inverse IDMT characteristic with usual setting range. The P. S. of the relay will reduce to 40 % of set value if voltage collapses below 70 % of rated voltage. TMS of the relay R is set at 0.2. The industry is running in two shifts and at night only one generator and GT unit is operating. The time of operation of the relay R for a three-phase fault at F as shown in the figure during night time (when only one generator is running), is</span></p>