What does rated conditions mean? Does it mean at max load? Open circuit test? I am so confused! (Power and Machines context)
What does rated conditions mean? Does it mean at max load? Open circuit test? I am...
The following readings were taken during an open-circuit test and short-circuit test on a three-phase, 10 MVA, 13.8 kV, 50 Hz synchronous generator driven at rated speed. Open Circuit Test Field Current 150 A 180 A 200 A 250 A 300 A 350 A Line voltage 11.2 kV 12.0 kV 12.5 kV 13.5 kV 14.3 kV 14.8 kV Short Circuit Test Field Current 150 A 180 A Short Circuit Current 400 A 480 A a) Plot the open-circuit and short-circuit...
if there is a label of 'unstable'. what does that mean? help!! please I am confused
1.Rated voltage: DC12V; No-load speed: 250RPM; Rated torque: 5kg.cm; Rated Current: 870mA. Given the specification of the motors! 1) what power,current, and voltage should I supply to get the full torque? 2) If I am delivering only 6V and 220mA, what will be the speed and torque ? 3)If I have load of 2lb, what will be the speed and torque assuming that the voltage is 9V and 300mA?
Q1.why the short circuit test of the transformer is done at voltage less than rated voltage? Q2.which has the largest power factor in the short or open circuit and why? note: please careful about the writing so the information can be readable thank you in advance
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...
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.
please answer 13.16
at rated load of unity power factor and rated terminal voltage, determine efficienc including field rheostat loss. Ans. 93.139 13.11 A generator under test is rated at 100 KVA, 3-phase, 60-Hz; 2,400 volts. (a) If driven b a de motor unexcited, the motor output is 1.26 KW. (b) If driven by a de motor, generato on open circuit and excited to generate rated potential, the motor output is 2.5 KW. ( Ifdriven by a de motor, generator...
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)
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