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A 13.2 kV (line-to-line voltage), 3-phase distribution system is shown below. The feeder line impedances are given in ohms. The system source impedance is considered negligible. The two feeder lines are protected by inverse time overcurrent relays. You ar
For the radial distribution system shown in the figure below, the impedances of the two line sections and the equivalent generator are given in pu. Consider symmetrical faults only (three-phase, positive sequence) and assume that the relay at bus A is set to pickup for a fault at bus C. The relay at bus B is set to pickup at one half of that value. 2) Assume there is a DER installed at bus C whose fault current contribution is...
In a balanced three-phase system, the source is wye-connected and the source voltage of phase A is Van = ∠ 120 20 V. The load consists of two balanced wyes in parallel with phase impedances of 8 + j6 Ω and 12 + j8 Ω. If the line impedance is zero, find the line currents and the phase currents in each load. (Hint: use per phase analysis, then do angle shift for each phase.)
A 3-phase, 1000-MVA, \(20-\mathrm{kV}, 60-\mathrm{Hz}\) synchronous generator is connected to an infinite bus as shown below. All impedances are given in pu values. The generator delivers \(0.9\) pu power at unity power factor to the infinite bus whose voltage is at 1 pu.If phase 'A' of circuit 2 (CCT 2) between buses H1 and H2 is suddenly opened at point ' \(\mathrm{F}\) ' near bus H1 due to the opening of a circuit breaker, determine:(a) [10 marks] The internal voltage...