a single phase transformer is rated for 0.5kVa, a primary voltage of 480V, and a secondary...
a single phase transformer is rated for 0.5kVa, a
primary voltage of 480V, and a secondary voltage of 120V. what is
the maximum full load that can be supplied by the
secondary?
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a single phase transformer is rated for 0.5kVa, a
primary voltage of 480V, and a secondary...
A single-phase transformer is rated at 10 kVA, 240/100 V. When the secondary terminals are open-circuited...
A single-phase transformer is rated at 10 kVA, 240/100 V. When the secondary terminals are open-circuited and the primary winding is supplied at normal voltage, the input current is 2.6 A at a power factor of 0.3 lag. When the secondary terminals are short-circuited, a voltage of 18 V applied to the primary causes the full-load current to flow in the secondary, the power input to the primary being 240 W. Calculate (a) the regulation (b) the efficiency of the...
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...
Given: 100kVA single phase transformer, Z=1.5% Primary: 480V 2 wire Secondary: 120/240V 3 wire Install the...
Given: 100kVA single phase transformer, Z=1.5% Primary: 480V 2 wire Secondary: 120/240V 3 wire Install the above transformer to serve a branch circuit panelboard. The panelboard will be located 10' from the transformer. The primary side raceway is PVC and the secondary raceway is EMT. All calculations will conform to applicable NEC regulations. The primary side, overcurrent protection device, will be chosen based on the next available standard size of the full load amps of the transformer. The secondary side,...
Solution: 7. (12 pts) A transformer is rated at 480V / 120V, 1.8kVA. Assume the transformer...
Solution:
7. (12 pts) A transformer is rated at 480V / 120V, 1.8kVA. Assume the transformer is ideal and all voltages and currents are RMS. a) What is the current rating of the primary? ww b) What is the current rating of the secondary? ZL = 8 •12 pf := 85.% lagging V l = 100. V c) V := 100.V How big is the source voltage (IVsI)? d) The secondary load (ZL) has a magnitude of 8 22 at...
A single phase 60 Hz two-winding power transformer is rated at 2400V/480V and 150 kVA. If...
A single phase 60 Hz two-winding power transformer is rated at 2400V/480V and 150 kVA. If an autotransformer is built from this conventional transformer to supply a load at 2880V with supply voltage 2400V. Draw the autotransformer and calculate the voltage, current and apparent power rating of the auto transformer. Also calculate the apparent power rating advantage of autotransformer over conventional transformer.
Problem 5: A single phase 60 Hz two-winding power transformer is rated at 2400V/480V and 150...
Problem 5: A single phase 60 Hz two-winding power transformer is rated at 2400V/480V and 150 kVA. If an autotransformer is built from this conventional transformer to supply a load at 2880V with supply voltage 2400V. Draw the autotransformer and calculate the voltage, current and apparent power rating of the auto transformer. Also calculate the apparent power rating advantage of autotransformer over conventional transformer.
A single-phase transformer rated 1.2kV/120V, 7.2kVA yields the following results: Open circuit test (performed on secondary...
A single-phase transformer rated 1.2kV/120V, 7.2kVA yields the following results: Open circuit test (performed on secondary side): V2=120V I2=1.2A W2=40W Short circuit test (performed on primary side): V1=20V I1=6A W1=36W Determine: i. ii. iii. The equivalent circuit referred to primary side The equivalent circuit referred to secondary side Efficiency of transformer when it delivers 6kVA at 120V and 0.9pf
7. A transformer is rated at 75kVA, with a primary voltage of 32kV. When tested under...
7. A transformer is rated at 75kVA, with a primary voltage of 32kV. When tested under "Full Load" condition, its copper loss is 870W and core loss is 320W. If an industrial load rated at 1500V with a pf = 0.76 is connected to the secondary, determine: a) The transformation ratio. b) Total power loss at "one-third load". c) Efficiency of the transformer at "one-third load". d) Primary and secondary currents at "one-third load".
When a voltage higher than the rated voltage is applied to a transformer primary, a voltage...
When a voltage higher than the rated voltage is applied to a transformer primary, a voltage ___ than the rated secondary voltage will be delivered to a load. A. Higher B. Lower
Q/&&&A transformer rated at primary voltage 4800 volts and a secondary voltage of 240 volte what...
Q/&&&A transformer rated at primary voltage 4800 volts and a secondary voltage of 240 volte what is the turn's ratio and Primary and secondary current
A single-phase transformer is rated at 10 kVA, 240/100 V. When the secondary terminals are open-circuited and the primary winding is supplied at normal voltage, the input current is 2.6 A at a power factor of 0.3 lag. When the secondary terminals are short-circuited, a voltage of 18 V applied to the primary causes the full-load current to flow in the secondary, the power input to the primary being 240 W. Calculate (a) the regulation (b) the efficiency of the...
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...
Solution:
7. (12 pts) A transformer is rated at 480V / 120V, 1.8kVA. Assume the transformer is ideal and all voltages and currents are RMS. a) What is the current rating of the primary? ww b) What is the current rating of the secondary? ZL = 8 •12 pf := 85.% lagging V l = 100. V c) V := 100.V How big is the source voltage (IVsI)? d) The secondary load (ZL) has a magnitude of 8 22 at...
7. A transformer is rated at 75kVA, with a primary voltage of 32kV. When tested under "Full Load" condition, its copper loss is 870W and core loss is 320W. If an industrial load rated at 1500V with a pf = 0.76 is connected to the secondary, determine: a) The transformation ratio. b) Total power loss at "one-third load". c) Efficiency of the transformer at "one-third load". d) Primary and secondary currents at "one-third load".
Q/&&&A transformer rated at primary voltage 4800 volts and a secondary voltage of 240 volte what is the turn's ratio and Primary and secondary current
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