Three single-phase transformers are connected in delta-delta configuration to step up a line voltage of 8...
Three single-phase transformers are connected in delta-delta configuration to step up a line voltage of 8 kV to 120 kV. A 24 MVA load at angle 30 is connected to the high voltage side. Calculate:
a) Transformer turns ratio
b) Load power in MW
c) Line current in HV and LV sides
d) The apparent power supplied by each transformer
e) If one transformer is removed for maintenance, what is the reduction percentage in the transformer bank power rating with only two transformers?
Homework Answers
Add Answer to:
Three single-phase transformers are connected in delta-delta
configuration to step up a line voltage of 8...
Problem 4 Three ideal single-phase transformers are connected in a delta/wye configuration with the primary side of 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...
Three single-phase transformers are connected in a wye-delta configuration to step down a line voltage of...
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...
Three single phase step-up transformers rated at 40 MVA, 13.2 kV/80 kV are connected in delta-wye on a 13.2 kV transmission line
a. Three single phase step-up transformers rated at 40 MVA, 13.2 kV/80 kV are connected in delta-wye on a 13.2 kV transmission line. If they feed a 90 MVA load calculate the following: i. The secondary line voltage ii. The current in the transformer windings iii. The incoming line currents iv. If the transformer types are two (2) additive and one (1) subtractive draw the connection diagram for the configuration stated using physical representation. b. A 3-phase squirrel cage motor has twelve (12) leads (labelled 1 to...
A three single-phase transformers steps up the three-phase generator voltage of 13.8 kV (line to line)...
A three single-phase transformers steps up the three-phase generator voltage of 13.8 kV (line to line) to a transmission voltage of 138 kV (line to line). The generator rating is 41.5 MVA. Find the voltage, current, and kVA ratings of each transformer for the following connections: Low-voltage windings Delta, high-voltage windings Y. Low-voltage windings Y, high-voltage windings Delta.
1. In order to meet an emergency, three single-phase transformers with 12.470/7.200 V are connected in...
1. In order to meet an emergency, three single-phase transformers with 12.470/7.200 V are connected in Delta-Wye to form a three-phase transformer which is fed by a 12.470 V transmission line. If the transformer supplies 60 MVA to a load, calculate: (3 marks) a. The turns ratio for each transformer b. The currents in the primary and secondary windings of the transformer c. The primary and secondary transmission line currents 2. A Wye-Delta transformer is connected to a 66 kV...
1. Three single-phase step-up transformers rated at 75 MVA, 13.2 kV/80 kV are connected in delta-...
1. Three single-phase step-up transformers rated at 75 MVA, 13.2 kV/80 kV are connected in delta- wye on a 13.2 kV transmission line. If they feed a 180 MVA load, calculate the following: a. The secondary line voltage b. The currents in the primary and secondary windings C. The incoming and outgoing transmission line currents
A 3-phase transformer 50 MVA, having line-voltage ratio of 11 kV/33kV is connected in star-delta
A 3-phase transformer 50 MVA, having line-voltage ratio of 11 kV/33kV is connected in star-delta What must be the ratio of the protective transformers on the both sides?
Problem 2: A three-phase transformer bank (1-phase transformers) is to handle 30 MVA and have a...
Problem 2: A three-phase transformer bank (1-phase transformers) is to handle 30 MVA and have a primary voltage of 115kVLL and a secondary voltage of 4.16kVLL. Find the rating of each individual transformer in the bank (high side voltage, low side voltage, transformer turn ratio, and apparent power rating of each transformer) if the bank is connected: Wye-Wye Wye-Delta Delta-Wye Delta-Delta Draw winding connections for (a)-(d) (NOTE: This step does not need to be done in MATLAB). Assume all delta...
A 100 MVA, 66 kV/230 kV, Delta- Wye three phase transformer is protected by a differential...
A 100 MVA, 66 kV/230 kV, Delta- Wye three phase transformer is protected by a differential relay. Current transformer ratio at the LV side is 1000 :5 A. a) Sketch connection of differential relays to the transformer b) Current transformers available for use at the HV side are 800:5, 600:5, 400:5 and 200:5. Select the suitable CT ratio. c) Sketch the phasor diagram to show currents in current transformers windings and power transformers windings d) Calculate the percentage of the...
Draw schematic (connection) diagrams for three-phase Y-Y and Y-Δ connected transformers using three single-phase (50 VA,...
Draw schematic (connection) diagrams for three-phase Y-Y and Y-Δ connected transformers using three single-phase (50 VA, 120V/25V) transformers you have previously worked with in the lab. Show proper dot markings for each configuration. I. 2. Find the line-line voltage ratio (VuVa) for each configuration. For a three-phase Δ-connected resistive load (25 Ω in each leg), connected on the transformer low voltage side, calculate the line current on each side of the transformer for each configuratio Is it safe to operate...
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...
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...
1. In order to meet an emergency, three single-phase transformers with 12.470/7.200 V are connected in Delta-Wye to form a three-phase transformer which is fed by a 12.470 V transmission line. If the transformer supplies 60 MVA to a load, calculate: (3 marks) a. The turns ratio for each transformer b. The currents in the primary and secondary windings of the transformer c. The primary and secondary transmission line currents 2. A Wye-Delta transformer is connected to a 66 kV...
1. Three single-phase step-up transformers rated at 75 MVA, 13.2 kV/80 kV are connected in delta- wye on a 13.2 kV transmission line. If they feed a 180 MVA load, calculate the following: a. The secondary line voltage b. The currents in the primary and secondary windings C. The incoming and outgoing transmission line currents
Draw schematic (connection) diagrams for three-phase Y-Y and Y-Δ connected transformers using three single-phase (50 VA, 120V/25V) transformers you have previously worked with in the lab. Show proper dot markings for each configuration. I. 2. Find the line-line voltage ratio (VuVa) for each configuration. For a three-phase Δ-connected resistive load (25 Ω in each leg), connected on the transformer low voltage side, calculate the line current on each side of the transformer for each configuratio Is it safe to operate...
Most questions answered within 3 hours.
-
Where is the error in this code sequence?
String s1 = "Hello";
String s2 = "ello";...
asked 11 months ago -
Financial data for Joel de Paris, Inc., for last year
follow:
Joel de Paris, Inc.
Balance...
asked 11 months ago -
Consider this reaction:
Al2(SO4)3 (aq)+ BaCl3
(aq) Al2Cl6 (aq)- +
3BaSO4(s) . What is the...
asked 11 months ago -
Suppose that Savneet is considering increasing her
recent random sample from 20 car rentals to 40...
asked 11 months ago -
Trucks arrive at an unloading terminal at an average rate of 120
per hour.
Trucks arrive...
asked 11 months ago -
Why are methanol and ethanol completely soluble in water while
octanol is not very little soluble....
asked 11 months ago -
A facilities manager at a university reads in a research report
that the mean amount of...
asked 11 months ago -
When the CuSO4 is rehydrated by adding water to the anhydrous
compound, is this an endothermic...
asked 11 months ago -
A ray of sunlight is passing from diamond into crown glass; the
angle of incidence is...
asked 11 months ago -
A block of mass 0.249 kg is placed on top of a light, vertical
spring of...
asked 11 months ago -
how do the kidneys compensate in the presences of acidosis
a) trigger hyperventilate
b) reserve acid...
asked 11 months ago -
Question 501 pts
The rental rate of capital to the firm increases. Which of the
following...
asked 11 months ago