For a typical power system in Oman, 11KV is Converter to 415V by using a
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- A single-phase 100-kVA,2400/240-volt,60-Hz distribution transformer is used as a step-down transformer. The load, which is connected to the 240-volt secondary winding, absorbs 60 kVA at 0.8 power factor lagging and is at 230 volts. Assuming an ideal transformer, calculate the following: (a) primary voltage, (b) load impedance, (c) load impedance referred to the primary, and (d) the real and reactive power supplied to the primary winding.PowerWorid Simulator case Problem 3_60 duplicates Example 3.13 except that a resistance term of 0.06 per unit has been added to the transformer and 0.05 per unit to the transmission line. Since the system is no longer lossless, a field showing the real power losses has also been added to the oneline. With the LTC tap fixed at 1.05, plot the real power losses as the phase shift angle is varied from 10 to +10 degrees. What value of phase shift minimizes the system losses?TRUE or FALSE: Purchasing three single-phase transformer bank cost less than one three-phase transformer unit.
- 2/Which lines carry Medium Voltage Power to Distribution Transformers located near Customers' premises or areas? a. PRIMARY TRANSMISSION LINES b. SECONDARY DISTRIBUTION LINES c. PRIMARY DISTRIBUTION LINES d. SECONDARY TRANSMISSION LINES2) A three -phase transformer of 90 kVA, 13200/480 V (line to line), with connection Delta-Delta, has a resistance of 1.3% and a reactance of 8.2% per unit. a) Calculate the phase impedance of the transformer referred to the high side strain. b) Calculate the phase impedance of the transformer referred to the low side strain. c) Calculate the transformer voltage regulation into nominal conditions with F.P.0,8 in delay.consider a Y/D connected 30 MVA , 18/220 KV transformer with differential protection applied , for current transformer ratios 3000/5 A in primary and 200/5 secondary . Calculate the relay currents on full load . Find the minimum relay current setting to allow 150 percent overload also draw the diagram of transformer connection
- A 101 MVA 11kV/220 kV single-phase power transformer has a per-unit resistance of 1.1 percent and a per-unit reactance of 4.8 percent (data taken from the transformer's nameplate). The core resistance is 259 per unit and the magnetizing impedance is j82 per unit. Determine Rc referred to the high-voltage side of the transformer.A 3-phase transformer bank will be created with three 600 VA, 120/240 v one-phase transformers. Phase andline voltages, phase and line currents, rated values of the 3-phase transformer to be obtained Y-Ycalculate for connection?A 300-kVA, 460-V, balanced three-phase load is supplied by three single phase transformers connected in Δ/Y to form a three-phase transformer. The primary winding of the three-phase transformer is connected to a 4.8 kV, three-phase transmission line. Determine (a) the rated primary voltage and current, (b) the rated secondary voltage and current, and (c) the power rating of each transformer. -What are the primary and secondary line currents?
- 3.The specifications of a conventional single-phase transformer are 60 kVA, 600V/240V with a total leakage reactance of 10%. If it is reconnected as an autotransformer to obtain a 600V/840V ratio, what would be the new reactance in percentage, at the new nominal values of the autotransformer?A three-phase Δ-Δ transformer is used to step down a line voltage of 625 kV, to supply a plant operating at a line voltage of 12.5 kV. The plant draws 40 MW with a lagging power factor of 85 percent. Find: (a) the current drawn by the plant, (b) the turns ratio, (c) the current on the primary side of the transformer, and (d) the load carried by each transformerTrue or False? Consider a 3 phase transformer with same line to line voltage ratio. The delta -delta transformer can handle higher line currents than a Y-Y transformer.