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Question 1. FIGURE 1 shows four generators feeding into a sectionalised busbar with a fault limiting reactor.
FIG. 1
Each generator is rated at 11 kV and 30 MVA and has a reactance of 0.2 p.u.
Calculate the value of the reactance to limit the fault level on a feeder to 500 MVA.
Question 2. FIGURE 2 shows the sectionalised busbar of a two generator power station connected to the national grid.
Calculate, using a 40 MVA base, the fault level for a 3-phase symmetrical short circuit on the 11 kV feeder.
If the switching frequency is doubled, but the total power dissipation is to remain the same with the same load capacitance, determine the required bias voltage.
The armeture leakage reactance is 0.10 per unit on the generator rating as abase. Find(a) the unsaturated value of the synchronous reactance inohms per phase and per unit, (b) the short-circuit ratio, and (c)the saturated reactance in per unit and..
The loop transfer function of a single-loop negative feedback system is: L(s) = Gc(s)G(s) = K(s + 2.5)(s + 3.2) / (s2(s + 1)(s + 10)(s + 30)) This system is called conditionally stable because it is stable only for a range of the gain K
Design (showing address, data, control line connections) a 32*8 low-order interleaved memory system using 16*2 memory chips for a system that uses 8-bit address bus.design assuming the unused address lines to be all ‘0's
This problem addresses the issue of capacitive loading on a high-speed serial transmission line like SPI. The SPI ports of two 9S12s are connected with a VERY long cable.
State the problem associated with setting a thermostat heat anticipator too high.
Estimate the LSB step size of the DAC described in Exercise 6.7 using its measured full-scale range (i.e. using the endpoint method). What are the gain error and offset error?
magnetic field, B, is constant, supplied either by a constant field current or by permanent magnets. The input voltage to the armature of the motor,Vin , connects to a circuit containing the armature impedance, R and L in series, and a dependent v..
Consider a 4 channel CDM system with the following CHIPS: A: -1 -1 -1 1 B: -1 -1 1 -1 C: -1 1 -1 -1 D: -1 1 1 1 a) Show that each one of those chips is orthogonal to all of the others. b) If the CDM signal 1 -1 -3 1 is received, by all receivers, ..
rc ciruit current course 3u-t a in parrallel to 6k ohm resistor and 5uf cap. determine the instantaneous power
Construct a system of multiples reproducing the potential of a uniformly charged square plate of total charge q and side 2a so that the error in the potential does not exceed 0.1% at R > I0a, where R is the distance from the center of the plate.
The circuit will have as inputs a minimum of two inputs; the binary equivalent of two decimal numbers of not greater than (10,000)10. The circuit will also produce a minimum of two outputs, the quotient and the remainder.
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