TWO WATTMETERS ARE CONNECTED TO MEASURE THE INPUT TO A BALANCE 3 PHASE CIRCUIT INDICATE 5000 W AND 2500 W RESPECTIVELY. FIND THE POWER FACTOR OF THE CIRCUIT. (1) WHEN BOTH THE READINGS ARE POSITIVE (2) WHEN THE LATTER READING IS OBTAINED AFTER REVERSING THE CONNECTION TO THE CURRENT COIL OF FIRST INSTRUMENT I

TWO WATTMETERS ARE CONNECTED TO MEASURE THE INPUT TO A BALANCE 3 PHASE CIRCUIT INDICATE 5000 W AND 2500 W RESPECTIVELY. FIND THE POWER FACTOR OF THE CIRCUIT. (1) WHEN BOTH THE READINGS ARE POSITIVE (2) WHEN THE LATTER READING IS OBTAINED AFTER REVERSING THE CONNECTION TO THE CURRENT COIL OF FIRST INSTRUMENT I

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter2: Fundamentals

Section: Chapter Questions

Problem 2.30P: Figure 2.26 shows three loads connected in parallel across a 1000-V(RMS),60Hz single-phase source....

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Figure 2.26 shows three loads connected in parallel across a 1000-V(RMS),60Hz single-phase source. Load 1: Inductive load, 125kVA,0.28PF lagging. Load 2: Capacitive load, 10kW,40kvar. Load 3: Resistive load, 15kW. (a) Determine the total kW, kvar, kva, and supply power factor. (b) In order to improve the power factor to 0.8 lagging. a capacitor of negligible resistance is connected in parallel with the above loads. Find the kvar rating of that capacitor and the capacitance in F. Comment on the magnitude of the supply current after adding the capacitor.
10) Two wattmeters connected to measure the input to a balanced three-phase circuit indicate 2500 W and 500 W respectively. Find the power factor of the circuit (a) when both readings are positive and (b) when the latter reading is obtained after reversing the connections to the current coil of one instrument.
a power station has a connected load of 48MW. the energy generated for the year is 61500MWh. if the station has a load factor of 35%. solve the demand factor of the station. Subject: Distribution System and Substation Design
. A power station has a connected load of 48 MW. The energy generated for the year is 61,500 MWh. If the station has a load factor of 35%, solve the demand factor of the station. Answer: 0.4179 or 41.79% Subject: Distribution System and Substation Design
Two wattmeters connected to a three-phase 440V squirrel cage induction motor indicate a total of 12kW.If the operating power factor of the motor is 0.4,determine the individual reading of the wattmeters. Show your solution.
power factor on 1100 V, 50 Hz mains. The power factor of the system is improved from 0.6 lagging to 0.95 lagging by using a capacitor bank embedded in delta. Assuming the KVA of the load remains constant, indicate the rating of the capacitor and find how much additional kW can be obtained. And If the capacitor bank is connected in star, indicate the rating of the capacitor
115 volts 60 cycle source is connected to series CKT, consisting of a fixed resistor and an impedance coil if the resistors and coil voltage drops are 55.4 and 80 volts, respectively under which conditions the current is 1.69 AMP, calculate the resistance and inductance of the impedance coil. solve for power factor solve for L coil Solve for R coil
A three phase energy meter having a meter constant of 0.12rev/kWh isused with a potential transformer of ratio 22000/110V and a currenttransformer of ratio 500/5 amperes. When connected to a load of unitypower factor , the disc makes 40 revolutions in 61 seconds. If theinstrument readings are 110V and 5.25A, find the percentage error.
A load of 500 kVA operates at 0.6 lagging power factor on 1100 V, 50 Hz mains. The power factor of the system is improved from 0.6 lagging to 0.95 lagging by using a capacitor bank connected in delta. Assuming the KVA of the load remains constant, indicate the rating of the capacitor and find how much additional kW can be obtained.
A load of 500 kVA operates on 1100 V, 50 Hz mains with power factor of 0.6 lagging. It is required to improve the power factor to 0.95 lagging by using the star connected capacitor bank. Assuming that the load KVA remains constant, suggest the rating of the capacitors.
2. A 3Ø, 2000KW, 480V ∆-connected alternator is short-circuited and is operated at ratedspeed to produce rated current at 4A excitation. With the short-circuit remove andwith the excitation adjusted to 5A, the voltage between stator terminal is 330V. Theeffective resistance between terminal as measured with dc is 2Ω. Determine the %V.R.of the alternator at half-load and pf of 0.8 leading without changing any given values.
A 1500 kvA, 3Φ star-connected alternator, 50 Hz,2300 V alternator has a resistance between each pair of terminals as measured by direct currents is 0.16 ohm. Assume that the effective resistance is 1.5 times the ohmic value. A field current of 70 A produces a short-circuit current equal to full load current of 376 A in each line. The same field current produces an emf of 700 V on open circuit. Determine the synchronous reactance of the machine and its full load voltage regulation at 0.8 power factor lagging. [Ans. VR = 22.8 %]