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Question 1:
The diagram below is the schematic of a protection system for a 33/11kV double transformer substation in which the 33kV switchboard and the 11kV switchboard are at the same location. The protection arrangements for T2 are the same as those for T1. Define and describe the system components, their mode of operation and where appropriate their zone limits. Indicate with reasons those elements that need to discriminate (grade) with other elements and those which do not.
Question 2:
In the above schematic, two Neutral Earthing Resistors are used. Would it be possible to use only one for both transformers? If so, what are the operational or other disadvantages and how could they be overcome?
Question 3:
The diagram below is the schematic of a protection system for a 33/11kV double transformer substation arranged as transformer feeders with no 33kV switchgear at the supplied substation.
The protection arrangements for T2 are the same as those for T1. Describe the operation of the protection scheme and contrast and compare it with the scheme described for Question 1. Indicate with reasons those elements that need to discriminate (grade) with other elements and those which do not
Assume that your application has 600 data reads for each 4000 instructions. For the same number of instruction the application has 400 data writes. The cache used has an instruction miss rate of 0.6% and a data cache miss rate of 6%.
Find the heat energy generated by this amplifier. Assuming the BJT power transistor has a maximum junction temperature of 155 0C, if the ambient temperature is 25 0C, find the maximum allowable thermal resistance from the junction to ambient.
Find the transfer functions, seros, and poles for the following systems:a. (D^2+10D+24)y(t)=(5D+3)f(t)b. (D^2+4D)y(t)=(3D+2)f(t)
isible light passes through a diffraction grating that has 900 slits per centimeter, and the interference pattern is observed on a screen that is 2.58 m from the grating. In the first-order spectrum, maxima for two different wavelengths are separat..
How to find the damping ratio and undamped natural frequency given a 2nd-order differential equation.
1) in a swamped common-emiter BJT amplifier, as shown below, if Vcc =12 V, R1 =8.2 kohm, R2=10 kohm, Rc = 500 ohm, Re= 1 kohm, Vbe = 0.7 V, and B =100, what is the transistor`s emitter current
Group and phase velocity in uniaxial crystals: a. Derive an expression for the group velocity of the extraordinary wave in a uniaxial crystal as a function of the polar angle of the propagation vector.
Develop a comparator circuit that takes two 2-bit operands (A and B, or A1 A0 and B1 B0) and gives a single bit output if A>B. Show the truth table for the circuit, K-map, and the circuit implementation. How would you extend your solution to build..
describe the specific safety precautions to be taken when working with computer systems to include safety guidance
Choose a microcontroller for a particular application - Design circuits incorporating microcontrollers plus any additional hardware to control a particular application.
Three point charges are positioned in the x-y plant as follows: 5 nC at y=5 cm, -10 nC at y=-5 cm, and 15 nC at x=-5 cm. Find the required x-y coordinates of a 20 nC fourth charge that will produce a zero electric field at the origin.
Given transfer function of dynamic system: T(s)= (2s^2 + 2s + 3) / (s^3 + 4s^2 + 6s + 10). write down state equation and output equation in Controllable Canonical Form and in Observable Canonical Form.
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