Fill in the blanks by inserting appropriate words/figures : a. The area under the daily load curve gives. b. The connected load is generally than the maximum demand. C. The value of the demand factor is than 1.
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- 2. a) Explain the terms load factor and diversity factor. b) Discuss the advantages of interconnected grid system. c) A generating station is to supply four regions of load whose peak loads are 10 MW, 5 MW, 8 MW and 7 MW. The diversity factor at the station is 1-5 and the average annual load factor is 60%. Calculate: (i) the maximum demand on the station, (ii) annual energy supplied by the station and (iii) suggest the installed capacity and the number of units.2) A single -phase power transformer of 150 MVA, 15/200 kV has a Resistance in unit of 1.1% and reactance per unit of 4.5%. The Magnetization impedance is J95 per unit. a) Find the equivalent circuit of the transformer referred to the bass side voltage. b) Calculate the transformer voltage regulation under conditions Nominal and F.P. 0.9 in delay.What effects are produced by change in voltage? 1. Iron los..........varies approximately as V². 2. Cu loss..........it also varies as V² but decreases with an increase in voltage if constant kVA output is assumed. 3. Efficiency...........for distribution transformers, efficiency at fractional loads decreases with in- crease in voltage while at full load or overload it increases with increase in voltage and vice- versa. 4. Regulation..........it varies as but decreases with increase in voltage if constant kVA output is assumed. 5. Heating.........for constant kVA output, iron temperatures increase whereas Cu temperatures decrease with increase in voltages and vice-versa.
- Low lagging power factor results in large voltage drop which results in poor.......... . (complete)2. What do you understand by the load curve? What information's are conveyed by a load curve?7. TY Hat CHICL Ans. 1. Iron los.........varies approximately as V². 2. Cu loss..........it also varies as ² but decreases with an increase in voltage if constant kVA output is assumed. 3. Efficiency...........for distribution transformers, efficiency at fractional loads decreases with in- crease in voltage while at full load or overload it increases with increase in voltage and vice- versa. 4. Regulation..........it varies as but decreases with increase in voltage if constant kVA output is assumed. 5. Heating.........for constant kVA output, iron temperatures increase whereas Cu temperatures decrease with increase in voltages and vice-versa. quems
- A single-phase to single-phase cycloconverter "bridge type" with input voltage and frequency 150V and 60Hz. respectively. The output frequency is 15Hz and the firing angle equal to 90°. The load is resistance with the value of 50. i. Draw the waveforms output voltage, output current, source current, the thyristors currents (ir1,ir3,ir1 and ir3). a. Calculate the rms of output voltage. b. Calculate the rms of output current and thyristor current. ii. If the firing angles of thyristors "with different firing angles technique". Draw the complete waveforms and comment on the results.A /Drive the ripple factor formula and explain how can you lowered it?The statement given in which option related to transformers is wrong.A) Power transformers are used as step-down transformers in step-up consumption centers in production centers. B) Current transformers for measuring current at high voltageVoltage transformers are used to measure voltage. C) Voltage adjustment can be made with the on-load tap changing feature of power transformers. D) Transformers are of great importance in reducing power losses by increasing the power value in energy transmission. E) If there is no reactive power in energy transmission with direct current, the transformer cannot be used.
- Explain the concept of FACTS (Flexible Alternating Current Transmission Systems) devices. How do they enhance the control and stability of power systems? Provide examples of FACTS devices and their applications.Construct the circuit in Figure 1 in the Circuit JS simulator. Note that the voltage source is given in RMS. Within Circuit JS while defining the max voltage of the voltage source include “rms” after the number to tell Circuit JS that this is a rms value. Also note that there are additional parameters when instantiating a transformer in Circuit JS. Leave these at the default values. Additionally, transformers may have problems simulating in Circuit JS. Answer the following: 1. From the simulation results, determine the power dissipated in R2 and compare to the expected value from the previous section.2. Change the transformer ratio (“Ratio” as a fraction when you “Edit…” the transformer component) to the value calculated in the previous section to provide maximum power transfer in R2. Note: In Circuit JS, Transformer Ratio = Primary/Secondary.3. Rerun the simulation, calculate the power dissipated in R2 and compare to the expected value from the previous section.4. Change the…A power station has this daily load curve data (a) Draw the daily load curve. (b) Draw the load duration curve. (c) Calculate the load factor and average demand.