A commercial office building is to be supplied service at 208Y/120 V from the utility company 12....
A commercial office building is to be supplied service at 208Y/120 V from the utility company 12.47 kV distribution feeder (12.47 kV L-L and 7.2 kV L-N). The estimated load is 85 kW at 0.9 lagging power factor. If the service is supplied from a bank of three single-phase overhead transformers (assume single bushing transformers) connected in a grounded-wye configuration, determine the appropriate apparent power rating and voltage rating to serve this load. Assume the load is continuous and allow a 25% factor for load growth.
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A commercial office building is to be supplied service at 208Y/120 V from the utility company 12....
3. A 12.47 kV feeder provides service to an unbalanced wye-connected load specified to be: Phase ...
Response: Me neither :/
3. A 12.47 kV feeder provides service to an unbalanced wye-connected load specified to be: Phase a: 1000 kVA, 0.9 lagging power factor Phase b: 800 kVA, 0.95 lagging power factor Phase c: 1100 kVA, 0.85 lagging power factor a) Compute the initial load currents assuming that 60% of the load is complex power, 25% constant current, and 15% constant impedance. b) Determine the currents at the start of the second iteration if the load voltages...
. Two choices of substation transformers with ratings of 12/16/20 MVA and 15/20/25 MVA are availa...
draw a single-line diagram for the possible choices
. Two choices of substation transformers with ratings of 12/16/20 MVA and 15/20/25 MVA are available. Transformers have Z1-8 % at their lowest MVA rating. Each transformer is allowed to be overloaded under emergencies by 30-40 % of its maximium rating . The 12.47 kV breakers have interrupting ratings of 12 kA, 16 kA or 20 kA with respective continuous rating of 800, 1200, or 2000 A . The impedance of the...
Can you help me calculating this question? Thank you. Can you calculate this working and explain why? Thank you! 1. A 5...
Can you help me calculating this question? Thank you.
Can you calculate this working and explain why? Thank you! 1. A 50-Hz 10-MVA, 66/22-kV distribution transformer has a full-load efficiency of 98% at 0.8 lagging power factor. The transformer core loss is 80 kW. The transformer supplies an industrial load that has a constant demand of 5000 kW at 0.65 lagging power factor. The cost of energy is S0.1 per kWh. In the following questions, assume that the voltage at...
can you answer this question and explain why? thanks. A 50-Hz 10-MVA, 66/22-kV distribution transformer has...
can you answer this question and explain why?
thanks.
A 50-Hz 10-MVA, 66/22-kV distribution transformer has a full-load efficiency of 98% at 0.8 lagging power factor. The transformer core loss is 80 kW. The transformer supplies an industrial load that has a constant demand of 5000 kW at 0.65 lagging power factor. The cost of energy is $0.1 per kWh. 1. In the following questions, assume that the voltage at the load terminal is maintained constant at 22 kV. calculations....
1. A 500kW 0.75 lagging load is supplied from a power source at 20 kV through...
1. A 500kW 0.75 lagging load is supplied from a power source at 20 kV through a transformer (630 kVA, 20/0.4 kV ), a circuit breaker and cables. The length of the line is 5 km. ( electrical conductivity of copper is 56 m/ohm.mm2 ) a. Find the apparent power supplied from the transformer by considering the losses on the line. (10 pts) b. Is there any problem with the system? Explain. (10 pts) c. To improve the load power...
A 220 kW load having 0.8 lagging power factor is supplied from a 600 V (line...
A 220 kW load having 0.8 lagging power factor is supplied from a 600 V (line to line) three-phase supply. A bank of power factor capacitors is delta connected. (a) Draw neat schematic diagram showing the connection of the capacitor bank in Delta connection. (b) Determine the KVAR rating of each individual capacitor needed to bring power factor to 0.9. (c) Determine the capacitance of each capacitor in uF.
e. What of curent and potential transformers in power system protection. g off a 400 V,...
e. What of curent and potential transformers in power system protection. g off a 400 V, s0 Hz supply is developing 10 kW with an efficiency of A single-phase motor operatin 94 percent and a power factor (p.f) 0.7 lagging L. the input apparent power iä the active and reactive components of the current; ii the reactive power (in kilovars) iv. Draw the power triangle . Using Phasor dingram, the capacitance required in parallel with the motor of to raise...
A 220 kW load having 0.8 lagging power factor is supplied from a 600 V (line to line) three-phase...
A 220 kW load having 0.8 lagging power factor is supplied from a 600 V (line to line) three-phase supply. A bank of power factor capacitors is delta connected Q2. (a) Draw neat schematic diagram showing the connection of the capacitor bank in Delta connection. (b) Determine the kVAR rating of each individual capacitor needed to bring power factor to 0.9 (c) Determine the capacitance of each capacitor in μF.
solve no: 3.14 , 3.16, 3.19 please show each step and solve for beginners 120 Power...
solve no: 3.14 , 3.16, 3.19
please show each step and solve for beginners
120 Power System Analysis 3.12. A single-phase system similar to that shown in Figure 3.11 has two transformers A-B a B-C connected by a line B feeding a load at the receiving end C. The ratings and parame ter values of the components are 500 V/1.5 kV, 9.6 kVA. leakage reactance 5 % 1.2 kV/120 V, 7.2 kVA, leakage reactance 4 % series impedance (0.5 +...
Problem 6 (20 points) Generate the per-unit admittance matrix for the following power system. All impedances...
Problem 6 (20 points) Generate the per-unit admittance matrix for the following power system. All impedances are in per unit quantities and do not include any load or source impedances. Bus 1 Bus 2 om 2192TO ZA = 1+j2 Za = 2+j3 Ze = 1+j0.5 Bus 3 Problem 7(10 points) An individual facility is to receive 480V three-wire delta service. The feeder voltage is 12,000V. If the existing estimated load is 900 kW and you need to plan for 20%...
Response: Me neither :/
3. A 12.47 kV feeder provides service to an unbalanced wye-connected load specified to be: Phase a: 1000 kVA, 0.9 lagging power factor Phase b: 800 kVA, 0.95 lagging power factor Phase c: 1100 kVA, 0.85 lagging power factor a) Compute the initial load currents assuming that 60% of the load is complex power, 25% constant current, and 15% constant impedance. b) Determine the currents at the start of the second iteration if the load voltages...
draw a single-line diagram for the possible choices
. Two choices of substation transformers with ratings of 12/16/20 MVA and 15/20/25 MVA are available. Transformers have Z1-8 % at their lowest MVA rating. Each transformer is allowed to be overloaded under emergencies by 30-40 % of its maximium rating . The 12.47 kV breakers have interrupting ratings of 12 kA, 16 kA or 20 kA with respective continuous rating of 800, 1200, or 2000 A . The impedance of the...
Can you help me calculating this question? Thank you.
Can you calculate this working and explain why? Thank you! 1. A 50-Hz 10-MVA, 66/22-kV distribution transformer has a full-load efficiency of 98% at 0.8 lagging power factor. The transformer core loss is 80 kW. The transformer supplies an industrial load that has a constant demand of 5000 kW at 0.65 lagging power factor. The cost of energy is S0.1 per kWh. In the following questions, assume that the voltage at...
can you answer this question and explain why?
thanks.
A 50-Hz 10-MVA, 66/22-kV distribution transformer has a full-load efficiency of 98% at 0.8 lagging power factor. The transformer core loss is 80 kW. The transformer supplies an industrial load that has a constant demand of 5000 kW at 0.65 lagging power factor. The cost of energy is $0.1 per kWh. 1. In the following questions, assume that the voltage at the load terminal is maintained constant at 22 kV. calculations....
A 220 kW load having 0.8 lagging power factor is supplied from a 600 V (line to line) three-phase supply. A bank of power factor capacitors is delta connected. (a) Draw neat schematic diagram showing the connection of the capacitor bank in Delta connection. (b) Determine the KVAR rating of each individual capacitor needed to bring power factor to 0.9. (c) Determine the capacitance of each capacitor in uF.
e. What of curent and potential transformers in power system protection. g off a 400 V, s0 Hz supply is developing 10 kW with an efficiency of A single-phase motor operatin 94 percent and a power factor (p.f) 0.7 lagging L. the input apparent power iä the active and reactive components of the current; ii the reactive power (in kilovars) iv. Draw the power triangle . Using Phasor dingram, the capacitance required in parallel with the motor of to raise...
solve no: 3.14 , 3.16, 3.19
please show each step and solve for beginners
120 Power System Analysis 3.12. A single-phase system similar to that shown in Figure 3.11 has two transformers A-B a B-C connected by a line B feeding a load at the receiving end C. The ratings and parame ter values of the components are 500 V/1.5 kV, 9.6 kVA. leakage reactance 5 % 1.2 kV/120 V, 7.2 kVA, leakage reactance 4 % series impedance (0.5 +...
Problem 6 (20 points) Generate the per-unit admittance matrix for the following power system. All impedances are in per unit quantities and do not include any load or source impedances. Bus 1 Bus 2 om 2192TO ZA = 1+j2 Za = 2+j3 Ze = 1+j0.5 Bus 3 Problem 7(10 points) An individual facility is to receive 480V three-wire delta service. The feeder voltage is 12,000V. If the existing estimated load is 900 kW and you need to plan for 20%...
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