Q1.why the short circuit test of the transformer is done at voltage less than rated voltage?...
ASSIGNMENT Develop the internal impedance model for the provided transformer, using appropriate short circuit and open circuit test at rated current and voltage respectively. The auxiliary transformer is a General Electric JE-27 auxiliary potential transformer rated 240-120Vac and thermal rating of 150VA Please provide the model results as follows: - Ohms referred to the 240V side Ohms referred to the 120V side - Per Unit based on the auxiliary transformer rating of 240- 120V and 150VA.
ASSIGNMENT Develop the internal...
The short-circuit test readings for a 50-kVA 2400:240-V transformer are 48 V, 20.8 A, and 617 W, with the instruments located on the high-voltage side and the low-voltage side short- circuited. An open-circuit test with the low-voltage side energized gives instrument readings on that side of 240 V, 5.41 A, and 186 W. 1. Calculate the equivalent parameters of the transformer as referred to the high-voltage side. 2. Draw the equivalent approximate circuit of that transformer referred to the high...
A 20 kVA, 12,000/380 V, single-phase transformer has the following test results:open circuit (low voltage side): V = 380, I = 2, P = 250short circuit (high voltage side): V = 200, I = 2.5, P = 250a)Determine the approximate equivalent circuit parameters of the transformer in per-unit values.b) the transformer is working at 80% full load with 0.85 power factor lagging. what is the secondary current at this working condition in both actual and per-unit values.
Problem 1 A 60Hz transformer is rated 30 (kVA), 4000(V)/120(V). The open circuit test, with the high voltage side open, gives Po= 100 (W), loc = 1.1455 (A). The short circuit test, measured with the low voltage side shorted, gives Pse = 180 (W), Vse = 129.79 (V). a) Determine the equivalent circuit for the transformer (both open and short circuit) b) Calculate the circuit components. (Req, Xeq, Rc, Xm)
2) A 50kVA, 2400/240V single phase transformer has the test measurements: (20) Open circuit test: 240V, 5.0A, 450W (HV open) Short circuit test: 55V, 20.8A, 600W (LV short) a Caleulate the transformer equivalent circuit parameters and draw the transformer equivalent circuit. b) Find the voltage regulation and efficiency when the transformer is connected to a load that is 75% of the rated load current at 0.8 pf lagging. c) Find the voltage regulation and efficiency when the transformer is full...
Question 2 A single-phase transformer has the following nameplate ratings: 100 kVA, 7200/240 V and 60 Hz. The following results are obtained from open-circuit and short-circuit tests: Test Open-circuit Short-circuit Voltage 7200 V 250 V Current 0.65 A 13.89 A Real Power Input 425 W 1420 W a) Determine the parameters of this transformer, all referred to the primary side. b) The secondary of this transformer is connected to a load that draws 100% of the rated power at rated...
lI. A single-phase 100 KVA, 2000/200 V transformer has the following test results Open-circuit (OC) test (LV side): 200 V, 8,0 A, 600 W Short-Circuit (SC) test (HV side): 100 V,50 A, 2000 W a. Determine the approximate equivalent circuit referred to the HV side. b. Find the voltage regulation at full-rated current delivering rated voltage and PF of 0.8 lagging. c. Calculate efficiency of transformer d. Assume that, voltage at HV side is 2000 V. Calculate the voltage at...
Question 31 (17 points) 120/120 single-phase transformer. Calculate the values for the equivalent circuit for the single-phase transformer for the given short and open circuit test shown below. (2 points) Draw the equivalent circuit. (1 point each) Find Ssc, QSC, Soc, Qoc, R1, R2, XI, X2, Rc, Xm, PFsc, PFoc, (esc θ。c) phase angel between V and I. What is the power rating of this transformer? Short circuit test (performed at High Voltage side) Vsc 16.20V rms, Isc 5.00 A...
A 75 kva, 230v/115v, 60hz transformer was tested with the following results: short circuit test:9.5v,326A,1200w, open circuit test:115v,16.3A,750w. Determine the percent voltage regulation at rated load 0.8 lagging? a)3.1% b)3.6% c)3.4% d)2.8%
Given a 31.5 MVA Single phase step down transformer.110 KV:11 KV The open circuit test values are Input voltage = 11 KV, P = 22.1 KW, I=5.85 A The short circuit test values are.Input voltage = 5.755 KV, P=163.935 KW, I= 286.36A If the transformer is run full load output with a power factor of 0.8 lagging 13. Find I2 and V2 bold denotes phasor values 14. Find the full load power P 15. Find the voltage drop across the...