See the attached file.
Electrical Power Systems Problems

1. A three-phase line serves a 54MW load with a .9 lagging power factor at a line voltage of 138KV. The line constants are:
A = D = 1 at 0 degrees
B = 85 ohms At 70 degrees
C = 950 x 10^4 siemens at 90 degrees

Find the line and phase values of voltage and current at the sending end.

2. For the system shown attached:

G1: 20KV, 250MVA, X = J10%
TI: 20/138KV, 200MVA, X=J15%
T2: A Bank of 3, 1-Phase Devices, each is rated at 15/79.77KV, 250MVA, X=J10%

Draw the per-unit diagram using the generator bases.

Modern aircraft engines are very reliable. One feature contributing to that reliability is the use of redundancy, where critical components are duplicated so that if one fails, the other will work. For example, single-engine aircraft now have two independent electricalsystems so that if one electrical system fails, the other ca

Please answer the following questions.
(a) It is found that if a microphone is brought into the proximity of a loudspeaker on a public address (P.A.) system, the system will `howl'. Carefully explain, making reference to feedback theory, why this is so.
(b) Suggest two actions that could be adopted to remedy the howling.
(c

Question: An electrical load operates at 240 volts rms. The load absorbs an average power of 8 kW at a lagging power factor of 0.8.
a) Calculate the complex power of the load.
b) Calculate the impedance of the load.
Please view attachment for multiple choice options.

1. A certain airplane has two independent alternators to provide electricalpower. The probability that a given alternator will fail on 1-hour flight is 0.02. What is the probability that
(a) Both will fail?
(b) Neither will fail?
(c) One or other will fail?
2. The contingency table belo

Hi
I hope you can help me with these few questions,
I have made some attempts myself.
On question 1 I have assumed a supply voltage of 28volts.
That is If this is what the question means.
The text book is HUGHES electrical and electronic technology
(1) A zener diode has a reverse breakdown volt

Florida Power & Light Co contracted with German multinational Siemens AG to supply the utility with three next-generation H-Class gas turbines to modernize its Port Everglades natural gas-fired power plant in Florida.
The electrical utilities industry is a very mature industry. NextEra Energy in this article is taking advanta

A factory's electrical load can be represented as three parallel admittances (see attachment). The values of the admittances are given in the table in polar form.
(a) Determine
(i) The current taken from the supply
(ii) The overall power factor of the load
(iii) The value of the capacitor required in parallel to the l

After reading the Office Move Scenario (attached), prepare an RFP (Request for Proposal) to solicit an electrical contractor. Your RFP should contain the following:
An Introduction to the project
Business profile (Just Use "Engineering Firm")
A description of the problem
A description of the Vendor responsibility (what you

The instantaneous current and voltage in an electrical circuit are given by:
i = Icos(50pi*t)
v = Vcos(50*pit + pi/6)
Determine an expression for the instantaneous power in the circuit p = iv, "AS THE SUM OF 2 COSINES"
If I is 0.003 Amps and V is 5 volts, calculate the maximum value of p, giving the answer in watts corre