Example 3.9. It has been desired to install a diesel power station to supply power in a suburbanarea having the following particulars :(i) 1000 houses with average connected load of 1.5 kW in each house. The demand factor anddiversity factor being 0.4 and 2.5 respectively.(ii) 10 factories having overall maximum demand of 90 kW.(iii) 7 tubewells of 7 kW each and operating together in the morning.The diversity factor among above three types of consumers is 1.2. What should be the minimumcapacity of power station?

Answered: Example 3.9. It has been desired to…

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

Chapter12: Power System Controls

Section: Chapter Questions

Problem 12.13P

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The figure below shows the one-line diagram of a four- bus power system. The voltages, the scheduled real power and reactive powers, and the reactances of transmission lines are marked at this one line diagram (The voltages and reactances are in PU referred to 100 MW base. The active power P2 in MW is the last three digits (from right) of your registration number (i.e for the student that has a registration number 202112396, P2 =396). [10] Starting from an estimated voltage at bus 2, bus 3, and bus 4 equals V2 (0) = 1.15<0°, V3 = 1.15 < 0°, V4 1.1< 0°. 1- Specify the type of each bus and known & unknown quantities at each bus. 2- Find the elements of the second row of the admittance matrix (i.e. [Y21 Y22 Y23 Y24]). 3- Using Gauss-Siedal fınd the voltage at bus 2 after the first iteration. 4- Using Newton-Raphson, calculate: |- The value of real power (P2), at bus 2 after the first iteration. Il- The second element in the first row of the Jacobian matrix after the first iteration. 2 P2…
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.
Sub:Distribution
Why rating of an Alternator is expressed in terms of VA,KVA or MVA ? Option 1: As losses are square times of the power factor Option 2: As losses depends on power factor Option 3: As losses are independent of power factor Option 4: As losses are inversely proportional to the power factor.
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Q5. Answer the following: Explain the power factor using a voltage and current waveform. How the power factor has the adverse effects on the power system quality. What are triplen harmonics? Why these are significant or what are there consequences on transformer and the machines? Explain the five types of voltage disturbances using waveforms, which affect the power quality in distribution system.
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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
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The shown distribution network is to supply two factories A & B with load curves indicated. Assume that both factories have a lagging power factor of 0.8. a) Select the required sizes of transformers for both factories such that in the case of a failure in one transformer the overload on the remaining ones should not exceed 15%. b) Select the required sizes of fuses to be installed at both sides of transformers. c) Calculate the annual energy losses in transformers of factory A. Assuming that transformers are in operation continuously. d) Select the required size of the 11KV. XLPE cables for the distribution network, if cables are to be laid direct in ground with maximum ground temperature of 30° C. e) Calculate the annual energy losses in cables of section SA . 2 Km A. 3 Km 11/0.4 KV Trans. 11/0.4 KV Trans. Factory A PF = 0.8 lag. Factory B PF = 0.8 lag. S(KVA) 500 S KVA) 500 400- 400 300- 200 300 200 100 100 12 Time (hr) 24 Time (hr) 24 6. 18 12 18 Load curve of Factory (A) Load…
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