Show how winding of delta-Y Transformer or Y-delta Transformer an be arranged in a way that...
Show how winding of delta-Y Transformer or Y-delta Transformer an be arranged in a way that always high voltage side lead the low voltage side if positive sequence is applied.
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Show how winding of delta-Y Transformer or Y-delta Transformer
an be arranged in a way that...
Problem 3. A three-phase transformer is constructed using three single-phase two-winding trans- formers, each has the...
Problem 3. A three-phase transformer is constructed using three single-phase two-winding trans- formers, each has the same ratings of 500 MVA, 15/240 kV, and leakage impedance of XT.p.u 0.2 p.u The high-voltage side of the three-phase transformer is connected to a three-phase Y-connected load that absorbs 1000 MVA at 0.9 power factor (lagging). The phase-a voltage across the load is Van 2402(0) kV. Answer the following questions. [10 points] a) Calculate the phase-a voltage at the low-voltage side (denoted by...
please answer all questions from i to vi. ULIUS 1. Explain how a fuse saving scheme...
please answer all questions from i to vi.
ULIUS 1. Explain how a fuse saving scheme is performed using a reciose. ii. What is a sectionalizer and how does it work is a sectionalizer and how does it work in coordination with a recloser? 111. Explain the effect of the magnetizing inrush current on transformer IV. Explain how transformer core faults, inter-turn faults and oil leaks be detected. V. Show the wiring diagram of a differential relay to protect a...
Problem 3: A 3-0, IMVA, 13.8kV/4160V, 60 Hz, transformer with Y-A winding connection is supplying a...
Problem 3: A 3-0, IMVA, 13.8kV/4160V, 60 Hz, transformer with Y-A winding connection is supplying a 3-0, 0.75 p.u. load on the 4160V side of the transformer. The land has leading power factor of 0.0.11 buc by 1 p.u. voltage on the 13.8kV side. The transformer per unit impedance is j0.12 referred to the secondary side. a) Find the load impedance b) Find the input current on the primary side in real units c) Find the input power factor
The two questions below. Like will be given, thanks! 1. What is the advantage of winding...
The two questions below.
Like will be given, thanks!
1. What is the advantage of winding the primary and secondary windings on the same limb of the core of a transformer? 2. The open circuit test on a 500 kVA, 69 kV / 4.16 kV, 60 Hz single phase transformer gave a wattmeter reading of 2400 W. The high voltage side was open and the measurements were taken on the low voltage side. What would be the reading of the...
A 150 KVA, 2080/208-V, 3 PHASE, delta-wye transformer with the following: RH 450m2 R 4.5m XH 2.20...
A 150 KVA, 2080/208-V, 3 PHASE, delta-wye transformer with the following: RH 450m2 R 4.5m XH 2.20 Load 120 KVA, 90KW (lagging power factor) at rated terminal voltage of 208V Determine a) b) c) The approximate equivalent circuit referred to the low-voltage side The primary voltage The transformer efficiency Please show the following: Circuit with the values given & found Equations used
A 150 KVA, 2080/208-V, 3 PHASE, delta-wye transformer with the following: RH 450m2 R 4.5m XH 2.20 Load...
1. If 480 volts is applied to the primary winding of a transformer which has 300...
1. If 480 volts is applied to the primary winding of a transformer which has 300 turns in the primary winding and 15 turns in the secondary winding, the secondary voltage will be A. 0.0417 volts. C. 56.8 volts B. 24 volts. D. 9600 volts. 2. A distribution transformer with a grain-orientented steel core is highly efficent because its A. exciting current is sufficiently high. B. flux direction is parallel to the stell-rolling direction C. permeability is increased due to...
Calculate the short circuit current of a 3-phase delta-wye connected transformer if the short circuit occurs...
Calculate the short circuit current of a 3-phase delta-wye connected transformer if the short circuit occurs between phase A and the neutral at the low voltage side. The transformer is supplied by a 12.5kV line-to-line voltage. The transformer rating is 50kVA, 12.5kV/500V and 9.2% (leakage reactance)
Question I The rating of a three phase three winding transformer are: Y-connected 10 KV 40 MVA Secondary Y-connecte...
Question I The rating of a three phase three winding transformer are: Y-connected 10 KV 40 MVA Secondary Y-connected 22 KV 40 MVA A-connected 4 KV 15 MVA Primary Tertiary Neglecting winding resistance and exciting current, the per unit leakage reactance are: Mps 9.6 % pu on 40 MVA, 11022 KV xm = 7.2 % pu on 40 MVA, I 10/ 4 KV Xsti: 12 % pu on 40 MVA, 22/ 4 KV Determine the era nyimpedances of the transformer...
Transformation Ratio not given for this question. Three identical Y-connected resistors of 1.0/0° per unit form...
Transformation Ratio not given for this question.
Three identical Y-connected resistors of 1.0/0° per unit form a load bank that is supplied from the low-voltage Y-side of a Y-A transformer. The neutral of the load is not connected to the neutral of the system. The positive and negative-sequence currents flowing toward the resistive load, are given by 14,1 = 1/4.50 per unit; 10,2 = 0.5 /250° per unit and the corresponding voltages on the low-voltage Y-side of the trans-former are...
Problem 1: A three-phase transformer has the following name plate data: Rated Power Primary voltage Secondary...
Problem 1: A three-phase transformer has the following name plate data: Rated Power Primary voltage Secondary Voltage Excitation reactance Series Impedance 150 MVA 230 kV 32 kV 30 (pu) 0.02+0.15j (pu) The transformer is Y/A connected. Answer the following questions: a) What are the nominal (rated) primary and secondary line currents?| b) What is the nominal value of the Delta-side winding (internal) current? c) What is the secondary to primary winding turn ratio? d) The transformer is supplying 150 MVA...
Problem 3. A three-phase transformer is constructed using three single-phase two-winding trans- formers, each has the same ratings of 500 MVA, 15/240 kV, and leakage impedance of XT.p.u 0.2 p.u The high-voltage side of the three-phase transformer is connected to a three-phase Y-connected load that absorbs 1000 MVA at 0.9 power factor (lagging). The phase-a voltage across the load is Van 2402(0) kV. Answer the following questions. [10 points] a) Calculate the phase-a voltage at the low-voltage side (denoted by...
please answer all questions from i to vi.
ULIUS 1. Explain how a fuse saving scheme is performed using a reciose. ii. What is a sectionalizer and how does it work is a sectionalizer and how does it work in coordination with a recloser? 111. Explain the effect of the magnetizing inrush current on transformer IV. Explain how transformer core faults, inter-turn faults and oil leaks be detected. V. Show the wiring diagram of a differential relay to protect a...
Problem 3: A 3-0, IMVA, 13.8kV/4160V, 60 Hz, transformer with Y-A winding connection is supplying a 3-0, 0.75 p.u. load on the 4160V side of the transformer. The land has leading power factor of 0.0.11 buc by 1 p.u. voltage on the 13.8kV side. The transformer per unit impedance is j0.12 referred to the secondary side. a) Find the load impedance b) Find the input current on the primary side in real units c) Find the input power factor
The two questions below.
Like will be given, thanks!
1. What is the advantage of winding the primary and secondary windings on the same limb of the core of a transformer? 2. The open circuit test on a 500 kVA, 69 kV / 4.16 kV, 60 Hz single phase transformer gave a wattmeter reading of 2400 W. The high voltage side was open and the measurements were taken on the low voltage side. What would be the reading of the...
A 150 KVA, 2080/208-V, 3 PHASE, delta-wye transformer with the following: RH 450m2 R 4.5m XH 2.20 Load 120 KVA, 90KW (lagging power factor) at rated terminal voltage of 208V Determine a) b) c) The approximate equivalent circuit referred to the low-voltage side The primary voltage The transformer efficiency Please show the following: Circuit with the values given & found Equations used
A 150 KVA, 2080/208-V, 3 PHASE, delta-wye transformer with the following: RH 450m2 R 4.5m XH 2.20 Load...
Question I The rating of a three phase three winding transformer are: Y-connected 10 KV 40 MVA Secondary Y-connected 22 KV 40 MVA A-connected 4 KV 15 MVA Primary Tertiary Neglecting winding resistance and exciting current, the per unit leakage reactance are: Mps 9.6 % pu on 40 MVA, 11022 KV xm = 7.2 % pu on 40 MVA, I 10/ 4 KV Xsti: 12 % pu on 40 MVA, 22/ 4 KV Determine the era nyimpedances of the transformer...
Transformation Ratio not given for this question.
Three identical Y-connected resistors of 1.0/0° per unit form a load bank that is supplied from the low-voltage Y-side of a Y-A transformer. The neutral of the load is not connected to the neutral of the system. The positive and negative-sequence currents flowing toward the resistive load, are given by 14,1 = 1/4.50 per unit; 10,2 = 0.5 /250° per unit and the corresponding voltages on the low-voltage Y-side of the trans-former are...
Problem 1: A three-phase transformer has the following name plate data: Rated Power Primary voltage Secondary Voltage Excitation reactance Series Impedance 150 MVA 230 kV 32 kV 30 (pu) 0.02+0.15j (pu) The transformer is Y/A connected. Answer the following questions: a) What are the nominal (rated) primary and secondary line currents?| b) What is the nominal value of the Delta-side winding (internal) current? c) What is the secondary to primary winding turn ratio? d) The transformer is supplying 150 MVA...
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