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Advanced AR and Power Systems Quiz
Test your knowledge on Automatic Reclosure (AR) systems and power generation techniques with our comprehensive quiz. This quiz covers various principles related to voltage regulation, island operations, and power quality.
Whether you're a student, teacher, or industry professional, this quiz will help solidify your understanding of key concepts.
- 51 challenging questions
- Multiple-choice format
- Instant feedback with correct answers
The reclaim time is always reset between two consecutive AR shots.
True
False
AR is usually inhibited immediately after a manual reclosure of the CB.
True
False
Either start or operate signal of a single protection can be used to initiate AR, never both of them from the same protection.
True
False
Usually the last trip after the final AR attempt is the most delayed one.
True
False
AR is primarily used for fault location purpose.
True
False
In all the studies AR initiation schemes time delay is applied only to the start signal of the protection stage.
True
False
1 The best generator in VCS sensitivity approach is the one that maximizes the electrical proximity index.
True
False
2 In compound voltage regulation at the MV busbar, load power factor is always known.
True
False
3 Partial compound is obtained with α > 1.
True
False
4 Partial compound is obtained with α < 1.
True
False
5 In compound voltage regulation in the MV busbar it is necessary to know the feeder current
True
False
6 By increasing the phase shift between grid and generator voltages, the produced active power is decreased
True
False
7 EAC (Automatic Load Balancer) method for measuring frequency is based on zero-crossing detection.
True
False
8 An electrical island is usually unwanted because power quality is not guaranteed.
True
False
9 Phase shift between generator voltage and grid voltage is used to regulate active power.
True
False
10 Phase shift between generator voltage and grid voltage is used to regulate reactive power.
True
False
11 In compound voltage regulation in the MV busbar the feeder current can be unknown.
True
False
12 Compound regulation is suitable when the feeders have DG units.
True
False
13 Compound regulation is not suitable when the feeders have DG units
True
False
14 Island operation can happen when generated power is greater than load power.
True
False
15 Island operation can happen when generated power is lower than load power
True
False
Linear (negative slope) P/f droop is not used in Italy to help frequency oscillation damping, thus avoiding island operation.
True
False
Linear (negative slope) P/f droop is used in Italy to help frequency oscillation damping, thus fostering island operation.
True
False
18 Island operation may occur in LV grids after a phase-to-ground fault on MV grid.
True
False
19 Perturb and observe method is one of the most common MPPT technique.
True
False
20 In perturb and observe method, PV orientation is changed to find optimal configuration.
True
False
21 RQV regulation is mainly dedicated to MV distribution grids
True
False
In the "power back up with two mesh branch lines" scheme each line must be able to energize at least 75% of the adjacent line.
True
False
2 0.9 Pn is the limit of the reverse power allowed for each transformer.
True
False
3 A line is classified as "critical" only when it is congested.
True
False
4 One of the effect of the increase of renewable generation is the so-called "duck" curve.
True
False
5 PCSLV (for an MV island): the limit value is 3.500 km x customer.
True
False
6 PCSLV (for MV lines): the limit value is 3.500 km x customer.
True
False
In MV island, PCS is obtained by multiplying the length of the island to the power not supplied in case of isolation.
True
False
In the “mesh branch line back up” scheme each line must be able to energize at least 75% of the load of one of the adjacent lines.
True
False
In the choice of the connection scheme of DG, the network degree of automation is never taken into account.
True
False
10 One of the effect of DG is to reduce the net power transfer at the HV/MV interface during peak time hours.
True
False
11 In the verification of LV DG connections the threshold for slow voltage deviations is 0.5.
True
False
12 In the verification of LV DG connections slow voltage deviations are never taken into account.
True
False
13 In the verification of LV DG connections slow voltage deviations are taken into account.
True
False
14 PCSMV: it is the product of island size (km) and the total number of customers directly connected to MV grid.
True
False
When evaluating the (possible) saturation of a transformer the minimum active power of the previous year is never taken into account by e-distribuzione.
True
False
When evaluating the (possible) saturation of a transformer the minimum active power of the previous year is taken into account by e-distribuzione.
True
False
17 PCS can be improved by dividing the grid in different islands using proper switching devices.
True
False
18 PCS cannot be improved by dividing the grid in different islands using proper switching devices.
True
False
1 In ESS applications, a power conversion system (PCS) is always required.
True
False
1 Flywheels are most suited for energy-intensive applications.
True
False
2 One of the pieces of information that can be derived by Ragone plots is the characteristic time of the ESS.
True
False
Ragone charts are drawn connecting ESS to a variable power load in order reach complete depletion of the ESS.
True
False
T∞ is the time for which the ESS can provide power for an indefinite amount of time.
True
False
True
False
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