Switching Operations Flashcards
7 cards from real SOPD practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Switching Operations flashcards as text
A switching order requires opening a 138 kV disconnect switch while the associated breaker is still closed. This is considered:
Answer: A serious procedural violation that could destroy the switch
Opening a disconnect switch under load creates a sustained arc that can destroy the switch and create a dangerous fault.
The 'three-phase dead check' before re-energizing a line requires verifying absence of voltage on:
Answer: All three phases using a calibrated voltage-measuring device
All three phases must be checked individually because a single-phase conductor could remain energized through backfeed.
A 'phantom load' condition on a distribution circuit can occur after switching when:
Answer: Capacitor banks remain connected and supply reactive power to the de-energized line
Capacitor banks can keep a de-energized line segment at near-normal voltage through resonant backfeed, creating a phantom load reading.
In the context of switching operations, what is 'clearance stacking'?
Answer: Issuing multiple clearances on the same equipment to different work crews simultaneously
Clearance stacking — issuing overlapping clearances on the same device — is a dangerous practice that can lead to one crew unknowingly re-energizing another crew's work zone.
When reconfiguring a substation bus arrangement, the operator must verify ground switches are open before energizing because:
Answer: Ground switches create a three-phase bolted fault if closed on an energized bus
Energizing a bus with a ground switch closed creates a bolted three-phase fault, resulting in catastrophic damage and potential injury.
A system operator receives a request to perform a 'hot transfer' of a 69 kV line from Bus A to Bus B. The correct sequence is:
Answer: Close Bus B breaker → Confirm parallel acceptable → Open Bus A breaker
A hot transfer requires closing the receiving breaker first to maintain continuity of supply, then opening the originating breaker after confirming the parallel is acceptable.
Which document provides the step-by-step sequence of individual switching steps, including device identification, action, and expected result?
Answer: Switching order (or switching sheet)
A switching order provides a detailed, pre-approved sequential list of switching steps with device IDs and expected outcomes for each action.