Topic 8 Quick Check OPS_330T

Analyse several voltage and current situations in different loading scenarios in a simplified radial (transformer to consumption) medium-voltage power system example. There are only 2 nodes in the 35 kV line – node 0 from the 110/35 kV and node 1 with one consumer. The physical characteristics of the line and the loading scenarios are individualized for each student – please see the attached file Excel “WM9P3 Task1 data” for your particular data set.  Briefly reflect on the complexity of the calculations for known input or output voltage, as well as for fixed or voltage-dependent consumption in this simple power system model.  Analyse and discuss the sensitivity of the voltage drop [in % of amplitude and the degrees of phase] with respect to the current level [in %] and to the power factor.

Voltages are represented by: e, = 20sinwt e2 = 30sin (wt ez = 40cos (wt +") e4 = -15sin wt es = -25cos (wt – ") Find the resultant instantaneous voltage using: (a) (b) (c) trigonometric identities component method complex method

27). 2 In the northeastern United States, in which direction does the needle of a magnetic compass point? OEast of geographic north O South of geographic north O North of geographic north West of geographic north 28) Inter-row spacing for a tilted rack array is determined by which factors? O Slope and voltage of modules O Sun angle and tilt of modules O Sun angle and voltage of modules O Rack manufacturer specifications 24) Which type of PV array mounting system is MOST common for a residential application with a sloped, south-facing roof? O Rack mount O Pole mount O Ballasted mount O Standoff mount 30) A specification requires the PV array for a stand-alone PV system to be sized to produce 1.25 times the average daily system load of 80 Ah when the irradiation recelved on the array is 4 peak sun hours. If the selected PV module has STC-rated maximum power current (Imp) of 5 A, how many parallel- connected strings of modules are required? 5 31 Which silicon solar cell manufacturing…

Explain the following for underdamped response of second order system. 1. Overshoot 2. Decay Ratio 3. Rise Time 4. Response Time.

The following problems refer to grounding requirements. Give the source of yourresponses. 1. If they are present, what items are required to be bonded together to form a groundingelectrode system?

Question 3 and 4

a.) what is the KCL expression at node A and node B? I’m pretty sure it’s the first option for node A and option 3 for B, but I just want to make sure

QUESTION 1 The unit step response of a second-order open-loop LTI system is shown below Calculate approximate percentage maximum overshoot? Calculate approximate rise time value? (FYI: The rise time is defined as the time system takes from 10% to 90% of the final value) Calculate approximate settling time value? (FYI: The settling time is defined as the time at which the system reaches to steady-state value and remains within the tolerance of plus or minus 2%)

7. Describe the direct connection, series and parallel methods of measurements using Q-meters? Why and how do we use these methods, explain in brief.