for a transformer it is known that the high voltage current is 178.15 [mA] and the...
for a transformer it is known that the high voltage current is 178.15 [mA] and the low voltage current is 2.02 [A]. if the transformer works as an elevator at 8400 [KVA].
What is the transfer ratio?
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for a transformer it is known that the high voltage
current is 178.15 [mA] and the...
EMM2802 MAYIJUNE 2016 QUESTION B A single phase transformer has a high voltage to low voltage...
EMM2802 MAYIJUNE 2016 QUESTION B A single phase transformer has a high voltage to low voltage ratio of 10. The following parameters are referred to low voltage side, with a supply of 200V. Equvalent Impedance referred to low woltage side Zev 0.1+jo.s a Load impedance referred to low voltage side R-4000 X-2310 Magnetizing Branch referred to low voltage side Draw an approximate equivalent circut with the given parameters and determine the following: 81 The magnetizing current (), the core loss...
A 3 phase transformer bank is rated at 500 kVA and has a 34.5/11 kV voltage...
A 3 phase transformer bank is rated at 500 kVA and has a 34.5/11 kV voltage ratio. Find the following ratings of each individual transformer in the bank when the transformer is wye to Delta connected : High voltage, low voltage, turns ratio, and apparent power
A three-phase transformer bank is rated at 500 kVA and have a 34.5/12 kV voltage ratio....
A three-phase transformer bank is rated at 500 kVA and have a 34.5/12 kV voltage ratio. Find the following ratings of each individual transformer in the bank when the transformer is ∆-Y connected: high voltage, low voltage, turns ratio (a), and apparent power.
6. A 20 kVA. 60 Hz, 8000/277 V transformer has the following impedances referred to the high volt...
6. A 20 kVA. 60 Hz, 8000/277 V transformer has the following impedances referred to the high voltage side: Req-320, xe,-45Ω,R.-250kQ,Xm-30kQ. A) Calculate the voltage across rated load impedance with PF= 0.707 lagging when the transformer is connected to rated input voltage. B) Draw the phasor diagram showing the load voltage and current, voltage drop across the series impedance and voltage at the low voltage side of the ideal transformer, C) Calculate the efficiency of the transformer D) What adjustments...
Outcome 2. Assume you need to size voltage regulators for a distribution substation transformer. A copy...
Outcome 2. Assume you need to size voltage regulators for a distribution substation transformer. A copy of the transformer nameplate is given on the back. Assume your utility allows this transformer to run 20% overloaded for 4 hours a day. Part 1 Review the nameplate and provide: 1. OA Rating MVA 14 2. Low side voltage 14.3 kV Part 2 Recommend a three-phase voltage regulator by giving its capacity and line current ratings for a wye-wye connection. Power Rating (kVA):...
3.10 A 240/120 V, 4.8 kVA, 60 Hz, single-phase transformer is used to supply a 4.8...
3.10 A 240/120 V, 4.8 kVA, 60 Hz, single-phase transformer is used to supply a 4.8 kVA resistive load (i.e., the load has a power factor of 1.0) at rated voltage of 120 V a) If you assume the transformer is ideal, what would be the magni- tude of the expected primary side (240 V side) current? b) Again, if you assume the transformer is ideal, what is the apparent impedance of the load viewed from the high-voltage side of...
For 3,300V/220V transformer, open the low pressure side and input voltage of high pressure side was...
For 3,300V/220V transformer, open the low pressure side and input voltage of high pressure side was 3,300V and the current was 1A P.F. was 0.12 lagging. With this condition, connect load to low pressure side wich P.F. is 0.8 and it current flows 150A. In this moment what are the current and new P.F. of high pressure side?? Also draw phasor diagram before and after of connecting load.
9. A 45 kVA, 120 V: 280 V, single-phase transformer is to be connected as an...
9. A 45 kVA, 120 V: 280 V, single-phase transformer is to be connected as an autotransformer. Determine the voltage ratings of the of the high and low voltage windings for this connection and the kVA rating for the autotransformer connection. Ans: 280V:400V, 150 kVA
The secondary coil of a transformer provides the voltage that operates a food blender. The turns...
The secondary coil of a transformer provides the voltage that operates a food blender. The turns ratio of the transformer is 60/1 (primary/secondary) and is plugged into a 120 Vrms primary outlet. If the current in the secondary is 4.00 mA (rms), what is the power used by the blender?
Suppose there are two transformers between your house and the high-voltage transmission line that distributes the...
Suppose there are two transformers between your house and the high-voltage transmission line that distributes the power. In addition, assume your house is the only one using electric power. At a substation the primary of a step-down transformer (turns ratio = 1:22) receives the voltage from the high-voltage transmission line. Because of your usage, a current of 38.0 mA exists in the primary of the transformer. The secondary is connected to the primary of another step-down transformer (turns ratio =...
EMM2802 MAYIJUNE 2016 QUESTION B A single phase transformer has a high voltage to low voltage ratio of 10. The following parameters are referred to low voltage side, with a supply of 200V. Equvalent Impedance referred to low woltage side Zev 0.1+jo.s a Load impedance referred to low voltage side R-4000 X-2310 Magnetizing Branch referred to low voltage side Draw an approximate equivalent circut with the given parameters and determine the following: 81 The magnetizing current (), the core loss...
6. A 20 kVA. 60 Hz, 8000/277 V transformer has the following impedances referred to the high voltage side: Req-320, xe,-45Ω,R.-250kQ,Xm-30kQ. A) Calculate the voltage across rated load impedance with PF= 0.707 lagging when the transformer is connected to rated input voltage. B) Draw the phasor diagram showing the load voltage and current, voltage drop across the series impedance and voltage at the low voltage side of the ideal transformer, C) Calculate the efficiency of the transformer D) What adjustments...
Outcome 2. Assume you need to size voltage regulators for a distribution substation transformer. A copy of the transformer nameplate is given on the back. Assume your utility allows this transformer to run 20% overloaded for 4 hours a day. Part 1 Review the nameplate and provide: 1. OA Rating MVA 14 2. Low side voltage 14.3 kV Part 2 Recommend a three-phase voltage regulator by giving its capacity and line current ratings for a wye-wye connection. Power Rating (kVA):...
3.10 A 240/120 V, 4.8 kVA, 60 Hz, single-phase transformer is used to supply a 4.8 kVA resistive load (i.e., the load has a power factor of 1.0) at rated voltage of 120 V a) If you assume the transformer is ideal, what would be the magni- tude of the expected primary side (240 V side) current? b) Again, if you assume the transformer is ideal, what is the apparent impedance of the load viewed from the high-voltage side of...
9. A 45 kVA, 120 V: 280 V, single-phase transformer is to be connected as an autotransformer. Determine the voltage ratings of the of the high and low voltage windings for this connection and the kVA rating for the autotransformer connection. Ans: 280V:400V, 150 kVA
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