AEP AEP Substation Operations 2 — Questions and Answers
Question 1: What does SCADA stand for in substation automation?
- System Control and Data Access
- Supervisory Control and Data Acquisition (Correct answer)
- Substation Control and Distribution Automation
- Smart Circuit and Data Analysis
Correct answer: Supervisory Control and Data Acquisition
SCADA (Supervisory Control and Data Acquisition) systems allow operators to remotely monitor and control substation equipment from a control center.
Question 2: What is the role of a capacitor bank in a distribution substation?
- To store backup power for outages
- To improve power factor and provide voltage support (Correct answer)
- To limit fault currents
- To regulate transformer tap positions
Correct answer: To improve power factor and provide voltage support
Capacitor banks supply reactive power to improve power factor and support voltage levels on the distribution system.
Question 3: What is a substation 'switching order' used for?
- To order replacement equipment for the substation
- To document and authorize a sequence of switching operations (Correct answer)
- To record equipment maintenance history
- To schedule substation inspections
Correct answer: To document and authorize a sequence of switching operations
A switching order is a written document that authorizes and sequences specific switching operations to safely isolate or energize substation equipment.
Question 4: What is the purpose of an automatic recloser installed on a distribution feeder leaving a substation?
- To measure feeder load continuously
- To automatically restore power after a temporary fault (Correct answer)
- To regulate voltage along the feeder
- To balance load between phases
Correct answer: To automatically restore power after a temporary fault
Reclosers automatically interrupt and re-energize a feeder after a temporary fault, restoring service without manual intervention.
Question 5: What is the significance of a substation's short circuit capacity (fault level)?
- The maximum energy the substation can store
- The maximum fault current the substation equipment must withstand (Correct answer)
- The minimum load the substation must maintain
- The transformer's rated continuous capacity
Correct answer: The maximum fault current the substation equipment must withstand
Short circuit capacity determines the maximum fault current that can flow, which equipment must safely interrupt or withstand without damage.
Question 6: Which instrument transformer is used to measure voltage in a high-voltage substation?
- Current transformer (CT)
- Potential transformer (PT) or voltage transformer (VT) (Correct answer)
- Power transformer
- Autotransformer
Correct answer: Potential transformer (PT) or voltage transformer (VT)
Potential transformers (PTs) or voltage transformers (VTs) step down high voltages to safe, standardized levels (typically 120V) for metering and protection.
AEP AEP Substation Operations 2
What does SCADA stand for in substation automation?