FIGURE 1 shows four generators feeding into a sectionalised busbar with a fault limiting reactor.FIG. 1Each generator is rated at 11 kV and 30 MVA and has a reactance of 0.2 p.u.Calculate the value of the reactance to limit the fault level on a feeder to 500 MVA.2. FIGURE 2 shows the sectionalised busbar of a two generator power station connected to the national grid.Calculate, using a 40 MVA base, the fault level for a 3-phase symmetrical short circuit on the 11 kV feeder.BXR Y B FaultLoadsA CD2Teesside University Open Learning (Engineering)© Teesside University 2011FIG. 23. State:(i) The function of a plug bridge on an IDMT electromagnetic protection relay.(ii) Two ways in which the setting of an IDMT electromagnetic relay may be altered.R Y B Fault2 × 40 MVA 0.14 p.u.0.31 p.u. on 40 MV
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