which Q5:- Estimate the synchronous impedance for an 11 kV, three-phase, 50 Hz, 20 MVA alternator develops rated emf on no-load with a field current of 20 A. A field current of 12 A produces a short circuit current equal to rated current.
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- A 3-phase, wye connected alternator rated at 1600 kVA, 13.5 kV. The effective armature resistance and synchronous reactance are 1.5 ohms and 30 ohms, respectively. What is the percent regulation for a load of 1280 kW at 0.80 leading power factor?An AC generator having an internal resistance of 2 ?? is connected to an LCR circuit in series as shown in the figure. If the generator supplies an electromotive force, ? = 282 ??? (100??) volt, calculate:a) the impedance of the circuitb) the rms value of the current in the circuitc) the voltage drop across L, C and RA 4MVA, 13.3kV, 60Hz, 3-phase, wye-connected alternator has an effective resistance of 5.2 ohm per phase and a combined armature reactance of 10.4 ohm per phase. Determine the full load Voltage regulation (in %) at unity pf.
- Define the harmonic frequency and interharmonic frequency used in power system quality.Is it possible to measure the phase-shift angle in an AC single-phase circuit by an indirect method using an ammeter and a voltmeter? - Yes, but an instrument must be added to measure the active resistance of the load. - Yes, but an instrument must be added to measure the active power dissipated by the load. - Yes, but an instrument must be added to measure the frequency.A 15kVA, 440V, single-phase alternator draws a field current of 5A at rated load. With the same field current, the open circuit emf and short-circuit current are 100V and 80A respectively. The ohmic resistance of the armature between terminals is 0.12 ohm. The ratio of effective to ohmic resistance maybe taken as 1.1. Determine the voltage regulation (in %) when the load is purely resistive.
- A 30 MVA, three-phase, wye-connected, 60 Hz, 13.8 kV synchronous alternator has negligible stator resistance and synchronous reactance of 10 W/phase. Calculate the % voltage regulation of the alternator when it is operation in isolation (stand-alone) and delivering rated MVA to a 0.866 pf leading load at 13.8 kV. Calculate the % voltage regulation of the alternator when it is operation in isolation (stand-alone) and delivering rated MVA to a 0.707 pf lagging load at 13.8 kV.Draw the circuit diagram of Two quadrant chopper which is having average load current might be positive or negative. Explain each quadrant operation with neat sketchTwo impedances Z 1 and Z 2 , when connected separately across a 230 volt, 50 Hz supply consumed 100 watts and 60 watts at power factors of 0.5 lagging and 0.6 leading respectively. If these impedances are connected in parallel across 230 volt, 60 Hz supply, find: (a) total power absorbed and overall power factor; (b) the value of a reactance to be further connected in series with the two to make the overall power factor to be unity.
- Draw an HVDC system with proper arrangement of converters. Evaluate its technical and economic feasibility comparing with 3-phase AC line .Draw the circuit diagram of Two quadrant chopper which is having average load voltage might be positive or negative. Explain each quadrant operation with neat sketch.A single-phase 100-kVA,2400/240-volt,60-Hz distribution transformer is used as a step-down transformer. The load, which is connected to the 240-volt secondary winding, absorbs 60 kVA at 0.8 power factor lagging and is at 230 volts. Assuming an ideal transformer, calculate the following: (a) primary voltage, (b) load impedance, (c) load impedance referred to the primary, and (d) the real and reactive power supplied to the primary winding.