A single-phase transformer 5 kVA, operating at 50 Hz frequency has turns ratio of 20. The...

A single-phase transformer 5 kVA, operating at 50 Hz frequency has turns ratio of 20. The primary and the secondary winding resistances are 0.15 Ω and 0.025 Ω respectively, and the primary and secondary leakage reactances are 0.65 Ω and 0.15 Ω respectively. The magnetizing inductance and core loss resistance are 6 Ω and 1 Ω respectively.

i. Calculate the primary and secondary impedances referred to primary and sketch the APPROXIMATE equivalent circuit. (Note: please show all parameters in the circuit)

ii. Hence, by referring to primary equivalent circuit, determine the supply voltage and its phase angle if output terminal is connected to a load ZL= 14∠20° Ω and load voltage, V2 is 240∠0° Vrms.

determine the voltage regulation and efficiency when core loss is equal to 100 W.

Expert Solution

Manojponduru answered 1 month ago

A single-phase transformer of 3 kVA, 60 Hz, has a voltage ratio on open circuit of...

A single-phase transformer of 3 kVA, 60 Hz, has a voltage ratio on open circuit of 240 / 120 V. The primary and secondary resistances are 0.25 Ω and 0.05 Ω respectively, the corresponding leakage reactance being 0.75 Ω and 0.18 Ω. The transformer delivers current to the load at a 0.9 power factor lagging. Determine the voltage across the load. Determine the power dissipated by the load. Determine percentage voltage regulation referred to the secondary...

A current transformer rated 500/5 A, 20 VA, 50 Hz has a turns ratio of 1:99....

A current transformer rated 500/5 A, 20 VA, 50 Hz has a turns ratio of 1:99. Its resistance aand leakage reluctance of the secondary winding are 0.4 Ω and 0.35 Ω respectively. At rated non-inductive burden, the inphase and quadrature components of the exciting mmf are 6 AT and 8 AT respectively. Determine the current and phase angle error.

Exercises 1. A 25 kVA single-phase transformer has the primary and secondary number of turns of...

Exercises 1. A 25 kVA single-phase transformer has the primary and secondary number of turns of 200 and 400, respectively. The transformer is connected to a 220 V, 50 Hz source. Calculate the (i) turns ratio, and (ii) mutual flux in the core. 2. A 25 kVA, 2200/220 V, 50 Hz single-phase transformer’s low voltage side is short-circuited and the test data recorded from the high voltage side are P=150 W, I1 = 5A and V1 = 40 V. Determine...

The efficiency of a 400-kVA, single-phase, 60-Hz transformer is 98.77% when delivering full-load current at 0.8...

The efficiency of a 400-kVA, single-phase, 60-Hz transformer is 98.77% when delivering full-load current at 0.8 power factor, and 99.13% with half-rated current at unity power factor. calculate: (a) The iron loss. (b) the full-load copper loss. (c) the efficiency at 3/4 load, 0.9 power factor

A single-phase 300-kVA, 220/4400 V, 60 Hz transformer yielded the following information when tested: High voltage...

A single-phase 300-kVA, 220/4400 V, 60 Hz transformer yielded the following information when tested: High voltage winding open: Voltage=220 V, Current=40 A Power=l 000W Low voltage terminal shorted: Voltage= 195 V, Current=68.18A Power=4000W Find the equivalent circuit of the transformer as viewed from the high voltage Calculate the .efficiency of the transformer when it delivers its rated load at rated terminal voltage and 8 power factor lagging.

Assume that a 50-Hz, 50-kVA, star-delta transformer bank of vector group Yd11 is accidentally paralleled with...

Assume that a 50-Hz, 50-kVA, star-delta transformer bank of vector group Yd11 is accidentally paralleled with a 50-Hz, 50-kVA, star-star transformer bank of vector group Yy0. Both have a bank ratio of 2000/200-V. The equivalent impedances referred to the respective secondaries are ZΔ = 0.1106/60.2° Ω and ZY = 0.0369/60.2° Ω. (a) Assuming the load switch to be open, draw the connection diagram (3.0 marks). (b) Determine the magnitude of the current circulating in each transformer secondary (15.0 marks). (c)...

Find the main dimensions of a 2500 KVA, 187.5 rpm, 50 Hz, 3 phase, 3 kV,...

Find the main dimensions of a 2500 KVA, 187.5 rpm, 50 Hz, 3 phase, 3 kV, salient pole synchronous generator. The generator is to be a vertical, water wheel type. The specific magnitude loading is 0.6 Wb/m2 and the specific electric loading is 34000 A/m. Use circular pole with ratio of core length to pole pitch=0.65. Find the normal speed.

The secondary of a 500kVA, 4400/500 V, 50Hz, single-phase transformer has 500 turns. A) determine emf...

The secondary of a 500kVA, 4400/500 V, 50Hz, single-phase transformer has 500 turns. A) determine emf per unit. B) primary turns. C) secondary full load current D) maximum flux E) gross cross-sectional area of the core for flux density of 1.2 tesla F) if the core is square cross-section find the width of the limb

The 500 KVA, 69kV/11kV, 60 Hz transformer has total resistance Rp of 100 Ω and total...

The 500 KVA, 69kV/11kV, 60 Hz transformer has total resistance Rp of 100 Ω and total leakage reactance of Xp of 600 Ω. Calculate The per unit impedance of the transformer in percent (just magnitude) The voltage regulation of the transformer when it delivers 200 KVA with a lagging power factor of 90% while the secondary voltage is fixed at 11 kV. The actual primary voltage V1. The actual line current I1.

An ideal transformer has 50 turns in its primary and 250 turns in its secondary. 12...

An ideal transformer has 50 turns in its primary and 250 turns in its secondary. 12 V ac is connected to the primary. Find: a. The voltage ac available at the secondary. b. Current in the 10 ohms device connected to the secondary. c. Power supplied to the primary. d. Power supplied to the secondary.

Question