Distribution Systems & Infrastructure Flashcards
7 cards from real PECO practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Distribution Systems & Infrastructure flashcards as text
What is the standard secondary distribution voltage delivered to most residential customers in PECO's service territory?
Answer: 120/240V single-phase
Residential customers in PECO's territory receive 120/240V single-phase service from the distribution transformer secondary.
Which component steps down primary distribution voltage to utilization voltage for end users in a PECO distribution circuit?
Answer: Distribution transformer
Distribution transformers step down the primary distribution voltage (e.g., 13.2 kV or 4.16 kV) to secondary utilization voltage (120/240V).
PECO's primary distribution system most commonly operates at which voltage level for underground residential distribution?
Answer: 13.2 kV
PECO's underground residential distribution (URD) circuits typically operate at 13.2 kV primary voltage in most of its service area.
What is the primary purpose of a distribution substation in the PECO grid?
Answer: Step down transmission voltage to primary distribution voltage
Distribution substations use power transformers to step down high transmission voltages (e.g., 69 kV or 138 kV) to primary distribution voltage levels for local feeders.
Which switching device on a PECO overhead distribution feeder automatically interrupts fault current and attempts to restore service through pre-programmed reclosing sequences?
Answer: Recloser
A recloser automatically opens on a fault and then attempts to reclose a set number of times to restore service for temporary faults before locking out.
In PECO's distribution infrastructure, what does the term 'feeder' refer to?
Answer: A medium-voltage circuit originating from a substation bus that supplies distribution transformers
A feeder is a medium-voltage circuit (primary distribution) that originates at a substation bus and supplies multiple distribution transformers along its route.
What is the role of a sectionalizer in PECO's distribution system?
Answer: Count fault current operations and open after a set number to isolate a faulted section
A sectionalizer counts the number of times fault current passes through it and opens after the upstream recloser locks out, isolating only the faulted section of the feeder.