The voltage-flux adjustment of a certain single phase 220 V induction watthour meter is altered so that the phase angle between the applied voltage and flux due to it 75° instead of this 90°. The error introduced in the reading of this meter when the current is 5 A at unity power factor is O -24.56 W O 37.48 W O 24.56 W O-37.48 W

The voltage-flux adjustment of a certain single phase 220 V induction watthour meter is altered so that the phase angle between the applied voltage and flux due to it 75° instead of this 90°. The error introduced in the reading of this meter when the current is 5 A at unity power factor is O -24.56 W O 37.48 W O 24.56 W O-37.48 W

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

Chapter3: Power Transformers

Section: Chapter Questions

Problem 3.28P: For the system shown in Figure 3.34. draw an impedance diagram in per unit by choosing 100 kVA to be...

See similar textbooks

Similar questions

For a 3 phase 975 KVA generator.... if the voltage rating is 2400V what is the current rating at each power factor? 1. Unity power factor 2. 80% power factor 3. 50% power factor
A 3.3kV, star connected alternator has a transient reactance of 1Ω per phase and negligible winding resistance. It is protected by circulating current Merz-Price protection. The alternator neutral is earthed through the resistance of 3.75Ω The relays are set to operate when there is out of balance current of 1 A in secondary of 300/3 A current transformers. How much % of winding is protected against earth fault?
The metering of a 3 phase inductive load indicated the following values: 4000 kW, 34.5 kV, 80% power factor. What is the KVA? a. 4000 b. 5000 c. 3000 d. 7000
The following information is given in connection with an alternator: slots = 1.44; poles = 8; rpm = 900; turns per coil = 6; ( = 1.8x106; coil span = slots 1 to 16; winding is whole-coiled 3-phase; winding connections = star. What is the voltage generated between terminals? 1,276Vb. 2,210Vc. 635Vd. 1,100V
Q1. If in one cycle (360 degrees), all of instantaneous power falls under positive loops (no negative loops), the load must be: a.) a resistor b.) an inductor or capacitor Explain: Q2. A wattmeter will indicate zero when the current lags (or leads) the voltage by 90 degrees. Explain
12. An average voltage of 20 V is induced in a 500-turn solenoid as a result a change of flu which occurs in 0.5 second. Determine the total flux change.
At what p.f will one of the wattmeter reading be zero in a three-phase system. Please answer this in detail
In a laboratory there is a special equipment with a three-phase symmetrical load with three resistances each of R = 33 ‌Ω. Phase voltage Uf =289 V and frequency f = 50 Hz. a) Calculate main voltage b) Calculate the power that develops in the machine at Y connection . c) Calculate the current in each individual resistor in Y connection d) The machine is switched to D coupling. Calculate the power that develops in the machine at D coupling
Compare the emfs at 50Hz of the following 20 pole alternator windings wound in identical stators having 180 slots: a) A single winding with adjacent 5 poles per slot per pole wound, the remaining being unwound b) A single phase winding with all slots wound c) A 3 phase star connected winding with all slots wound All the coils in each phase are connected in series and each slot accommodates 6 conductors. The total flux per pole is 0.025Wb
A tree-phase generator has a load 100 kw per phase at a power factor 80 percent,lagging what is the trhee phase kilowatt load and kiloampere load
A three-phase wye connected synchronous machine has a stator with 2000 turns per phase. What rotor flux would be required to produce of voltage of 8.66 kV line to line.
A 400 v, 50 Hz, three phase alternators, rated at 75 kVA, is star connected and driven at 1000 r/min. The windings of the alternator have a resistance, per phase, of 0.03 Ω and synchronous reactance, at 50 Hz per phase, of j0.325 Ω. The stator of the alternator has 108 slots, with 8 conductors, per slots, in a double layer. The maximum pole flux is 8.772 x 10-3 Wb. To improve the wave form only 80% of the pole pitch is wound. Determine the smallest lagging power factor at which the alternator can deliver its rated load