Calculations. The following system has a WYE Primary, Delta Secondary, and a WYE configuration for the...
What is the answer for questions 2-5? Questions: 1. Delta-Wye and Wye-Delta configurations both produce: a) Increases in secondary voltages and currents. b) Decreases in the secondary voltages and currents. c) Phase shift between the incoming and outgoing line voltages. d) Additional V3 increases in the secondary voltages and currents. ANSWER: Choose an item. 2. The line voltage at the secondary of a 10:1 wye-delta connected transformer will be: a) Equal to the line voltage at the primary times b)...
4-9 Question Completion Status: QUESTION 4 A three phase delta source is connected to a three phase transformer. The primary of the transformer is connected in a delta configuration The line voltage on the primary is 240V. The turns ratio is 2:1. The secondary of the transformer is connected in a wye configuration. A wye connected load is attached to the secondary of the transformer. Each of the three load resistors has a resistance of 10 ohms. What is the...
Problem 4 Three ideal single-phase transformers are connected in a delta/wye configuration with the primary side of the three-phase transformer rated at 120 kV and the secondary side rated at 13.8 kV. The rated power of the transformer bank is 20 MVA. One side of the transformer bank is connected to a 120 kV transmission line, and the other side is connected to a three-phase load of 15 MVA at 0.85 lagging power factor. Compute the following: a) The turns...
What is the magnitude of the primary line current of a 14,000 – 480Y/277 V, delta-wye, three- phase distribution transformer if a 200kW, 0.88 P.F. lagging load is connected to the secondary. (assume that the transformer is lossless and that the primary is the high-voltage side)
Three single-phase transformers are connected in a wye-delta configuration to step down a line voltage of 13.8kV to 4160V to supply an industrial facility. The plant draws 8MW at a 0.80 power factor. Transformer impedances can be neglected. Calculate the following: a. the apparent power (SL) drawn by the load/plant. b. the apparent power (Ss) furnished by the HV source. c. the current in the HV lines (141) d. the current in the LV lines (112) e. the currents in...
Given a 3-phase WYE transformer at tached to WYE connected loads, each having a value of 100 2, and the phase voltage, Vp 100 V, determine the line voltage and line current for each load. (a) 100 V@1A (c) 100 V@ 1.73 A (b) (d) 173 V@1A 173 V @ 1.73 A For a balanced 3-phase system the power (S) may be determined according to the formula S 3 VL IL VA (volt-amperes). A 3-phase, WYE-connected, 200-k V A alternator...
Consider a Delta generator supplying Wye load. The generator has the following data: Line to line voltage of 11kV Rated power of 55 MVA Power factor capability of 0.7 lagging The load the following rated data Line to line voltage of 11kV Rated power of 40 MVA Lagging power factor of 0.8 For the above system: Design the Current Transformer system using the load data
I. A balanced three-phase positive sequence wye-connected 60Hz source voltage has line-neutral voltage of V, 1000 V. It is connected to a three- phase wye connected load whose impedance is z 50+j37.7 2 a. Find line currents ia ib, ic and line-line voltages Vab, Vbo Vac b. Find the total complex power delivered to the load. c. Find delta-connected capacitor bank needed to bring the PF to 0.95 (lagging) of system. d. Re-calculate currents la, ib, io with Case c....
I. A balanced three-phase positive sequence wye-connected 60Hz source voltage has line-neutral voltage of V, 1000 V. It is connected to a three- phase wye connected load whose impedance is z 50+j37.7 2 a. Find line currents ia ib, ic and line-line voltages Vab, Vbo Vac b. Find the total complex power delivered to the load. c. Find delta-connected capacitor bank needed to bring the PF to 0.95 (lagging) of system. d. Re-calculate currents la, ib, io with Case c....
(15 points) In a balanced three-phase wye-delta system, the source has a positive (abc) phase sequence and a phase voltage of Van 200VrmsZ - 30°. If the line impedance is zero and the line current is LaA -6ArmsZ- 65°, find the load impedance per phase in the delta. AB AB Arms