PECO Distribution Systems & Infrastructure 2

Question 1

Which type of cable insulation is most commonly used in PECO's underground distribution system for medium-voltage circuits?

Accepted Answer

Cross-linked polyethylene (XLPE)

Answer

Oil-impregnated paper (PILC)

Answer

Rubber (natural)

Answer

Polyvinyl chloride (PVC)

Question 2

What does the acronym 'URD' stand for in the context of PECO distribution infrastructure?

Accepted Answer

Underground Residential Distribution

Answer

Utility Reliability Division

Answer

Uniform Relay Diagram

Answer

Unit Restoration Dispatch

Question 3

A PECO feeder circuit experiences a permanent three-phase fault. Which protection device at the substation is the first to respond?

Accepted Answer

Substation feeder breaker

Answer

Distribution transformer fuse

Answer

Line recloser

Answer

Sectionalizer

Question 4

What is the main advantage of a looped (ring-bus) distribution system over a radial distribution system for PECO's service area?

Accepted Answer

Improved supply reliability through alternate feed capability

Answer

Lower capital installation cost

Answer

Elimination of transformer losses

Answer

Reduced need for protective relaying

Question 5

PECO installs capacitor banks on distribution feeders primarily to accomplish which of the following?

Accepted Answer

Provide reactive power compensation and improve power factor

Answer

Increase fault current for faster relay operation

Answer

Limit harmonic distortion from customer loads

Answer

Step up voltage for long-distance transmission

Question 6

In the context of PECO distribution operations, what is a 'pad-mounted transformer'?

Accepted Answer

A ground-level, tamper-resistant transformer in a locked enclosure set on a concrete pad

Answer

An overhead transformer mounted on a wooden pole

Answer

A substation power transformer on vibration-dampening pads

Answer

A portable transformer used during outage restoration

Question 7

Which conductor configuration is most commonly used for PECO overhead distribution primary lines to reduce line losses and improve voltage regulation?

Accepted Answer

Balanced three-phase three-wire or four-wire configuration

Answer

Single-wire earth return (SWER)

Answer

Two-wire single-phase configuration only

Answer

Bundled conductor with four sub-conductors per phase