PECO Distribution Systems & Infrastructure

Question 1

What is the standard secondary distribution voltage delivered to most residential customers in PECO's service territory?

Accepted Answer

120/240V single-phase

Answer

Residential customers in PECO's territory receive 120/240V single-phase service from the distribution transformer secondary.

Question 2

Which component steps down primary distribution voltage to utilization voltage for end users in a PECO distribution circuit?

Accepted Answer

Distribution transformer

Answer

Distribution transformers step down the primary distribution voltage (e.g., 13.2 kV or 4.16 kV) to secondary utilization voltage (120/240V).

Question 3

PECO's primary distribution system most commonly operates at which voltage level for underground residential distribution?

Accepted Answer

13.2 kV

Answer

PECO's underground residential distribution (URD) circuits typically operate at 13.2 kV primary voltage in most of its service area.

Question 4

What is the primary purpose of a distribution substation in the PECO grid?

Accepted Answer

Step down transmission voltage to primary distribution voltage

Answer

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.

Question 5

Which switching device on a PECO overhead distribution feeder automatically interrupts fault current and attempts to restore service through pre-programmed reclosing sequences?

Accepted Answer

Recloser

Answer

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.

PECO - Philadelphia Electric Company Certified Professional Practice Test

PECO - Philadelphia Electric Company Certified Professional Practice Test

PECO Distribution Systems & Infrastructure