Tender for Perkins Generators in Dubai

1-Alternators can be overloaded by 10 percentage for 10-15 minutes, this a. Steady state voltage stability will get affected b. may reduce the stability limit c. may disturb Nose point d. may lose Angular stability       2-Often, the network is referred as an infinite bus when a change in input mechanical power or in field excitation to the unit does not cause an appreciable change in a. system frequency or terminal voltage b. system frequency alone  c. system frequency and terminal voltage  d. Total production cost

a) Two thermal generator units have the following incremental cost curves then determine the ECONOMIC LOAD SCHEDULING between the generators for total load(PD) of 50 MW,65 MW,85 MW,110 MW and 150 MW. When load is zero, the cost of production of the generators are 100 and 180 respectively. Assume both generators are operating at all times and power loss is neglected. 7ww F1= 0.22 + 0.16 P1 Unit 1: Min 25 MW, Max 90 MW: F2= 0.48 + 0.41 P2 Unit 2: Min 15 MW; Max 75 MW b) b) Calculate Cost of production in each case.

Describe the role of FACTS (Flexible AC Transmission Systems) devices in enhancing the control and stability of power systems.

In a given system of base power of 250 MW, and bus 3 is taken as reference. The per-unit reactances are X12 = 0.2 p.u., X13 = X23 = 0. 1 p.u. The power flow in the system is given as: PF12 = 50 MW, PF13 = 150 MW, PF23 = 50 MW. Based on readings from 2 meters (not including M12 meter), M13 = 145 MW (not calibrated), and M23 = 50 MW (well calibrated), deduce the flow on line 1-2. Select one: O a. PF12 = - 47.5 MW. O b. None of these O c. PF12 = 67.5 MW. O d. PF12 = 47.5 MW. O e. PF12 =- 57.5 MW. O f. PF12 = 57 MW.

1. Thyristor-Switched Series Reactor (TSSR) for power factor improvement 2. What is penalty factor? Derive the expression for the penalty factor in economic load dispatch.

Cost of a 600 kW wind turbine is $ 550000. Other initial costs including that for installation and grid integration are 30 per cent of the turbine cost. Useful life of the system is 20 years. Annual O&M costs plus the land rent come to 3.5 per cent of the turbine cost. Calculate the cost of generating electricity from the turbine when it is installed at a site having a capacity factor of 0.25. The real rate of interest may be taken as 5 %.

Discuss the significance of FACTS (Flexible AC Transmission Systems) devices in enhancing power system stability.

Discuss motherboard power delivery systems, including voltage regulators and phases. How do they impact system stability and overclocking capabilities?

Explain the role of transformers in power transmission and distribution systems.

Answer all questions.

Explain the importance of load flow analysis in power systems. How does it help in optimizing the operation of electrical grids?

By comparing the principle of operation of a "three" phase generation system with a single-phase system, state what are the bendfits of three phase systems? In your own words, define the "skin effect" in transmission lines and discuss how can it be minimised? Name three advantages of AC transmission in comparison to DC transmission. What are the units of active, reactive and apparent power? The current in a single-phase motor lags 50° behind the voltage. What is the power factor of the motor?

Kindly explain the methods of reactive power compensation in power systems. Note: Strictly handwriiten only and no plagiarism please

Fast solution please

As seen in the figure, three generators of 800 kW, 900 kW and 1000 kW are connected in parallel. It generators feed 380 kW load. Frequency-active power graphs of generators are shown as given. According to this; a. Calculate the operating frequency for the situation given in the question.b. Calculate the power transferred by the generators to the load.c. A three-phase asynchronous load of 800 kW and 600 kVA with a reverse power coefficient of 0.78 is installed in the system. engine is connected. The new operating frequency of the system and the active power of the alternators. calculate.d. Do you think the generators in this system are suitable for parallel connection as in the figure?

Explore the use of FACTS (Flexible Alternating Current Transmission Systems) devices in advanced power system control and stability enhancement.

A 3Ø, Y-connected alternator is rated at 1,600KVA, 13.5KV. The armature effective AC resistance per phase is 1.50. The percentage regulation for a load of 1,280kW at unity power factor is 3.5%. Determine: (a) synchronous reactance of the alternator (b) %VR at full-load 0.8pf leading (c) What is the effect on %VR value if taken at half-load lagging pf? Justify and explain briefly your answer on one(1) sentence.

Describe the components and functions of a typical power system, including generators, transformers, and transmission lines.

A simple power system diagram is given below. The system consists of a 120/0 volt generator connected to an ideal 1:5 step up transformer, a transmission line, and ideal 10:1 step down transformer and a load. The impedance of the transmission line is 10 + j20, and the impedance of the load is 4+ j2 ohms. The base values for the system are chosen to be 120 volts and 10 KVA at the generator. a) Solve for the generator current lg using the per unit system. Do show your calculated per unit diagram. b) Solve for the value of the load voltage from the per unit system circuit. 10 n 20 n T: 10:1 ZLOAD = 4 + j2 120gv load

Electrical Engineering Topic. Please help to provide neat and correct solution for the given problem below. Thank you.

(a) A high voltage 3 phase induction motor operating at rated powwer can be represented by a balanced delta connected load (ZRY etc) of (350 +j100) 2 and is connected to a 3-phase, 11kV and 50 Hz supply. Draw the circuit diagram, indicating VRN, VRY and all load phase, and line currents. Calculate: (i) The three load phase currents (IRY, IYB and IBR). (1i) The three line currents (IR, ly and IB). The total real power (W) and reactive power (VAr) power at the 3 phase supply. (iii) (b) A fault condition in the above load in Q1(a) causes the impedance of ZRY to reduce to (100+j40) 2, but the other two impedances remain at (350 +jl100) 2. Using the information above: (i) Calculate the 3 load phase currents (IRY, IYB and IBR). Draw a scaled phasor diagram indicating all phase and line voltages and the three load phase currents. (ii) Using the scaled phasor diagram or otherwise determine the 2 line currents (IR and Iy). (111) (c) Specify the relevant measurements for each wattmeter in the 2…

2.41 A three-phase 25-kVA, 480-V, 60-Hz alternator, operating under bal- anced steady-state conditions, supplies a line current of 20 A per phase at a 0.8 lagging power factor and at rated voltage. Determine the power triangle for this operating condition.

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Discuss the main characteristics and energy conversion methods of the offshore wind turbine and hydropower highlighting their suitability for installation and grid integration in the United Kingdom.

(a) In the analysis and calculations of power systems, it is usual to use the Per- unit quantities instead of actual values. Give the advantages of using such a system. (b) What are the advantages for operating synchronous generators in parallel? (c) What are the conditions required for paralleling between the generators?

How can we determine the unit power cost?