EG1 CH.9

Question 1

What is the typical max distance distribution reaches?

Answer 1

50 miles

Question 2

What can the distribution be visualized as?

Answer 2

streets

Question 3

What is the average distribution span length?

Answer 3

300 ft

Question 4

What is the typical material used for distribution lines?

Answer 4

Aluminum

Question 5

What in the primary type of current for distribution?

Answer 5

AC

Question 6

What is the purpose of the distribution system?

Answer 6

To deliver power safely, with acceptable quality and reliability, and with a minimum loss of power.

Question 7

T or F: Circuit design on distribution lines has little impact on reliability.

Answer 7

False

Question 8

What is the term for an energized line?

Answer 8

Phase

Question 9

What is another name for main lines?

Answer 9

Feeder Mains

Question 10

T or F: Three phase main line may or may not have a neutral.

Answer 10

True

Question 11

What type of lines do distribution circuits consist of?

Answer 11

Main and Tap lines

Question 12

In regards to the wires, what is the difference between main lines and tap lines?

Answer 12

Main lines are larger than tap lines.

Question 13

What is another name for a WYE circuit?

Answer 13

Star system

Question 14

Describe the construction of a WYE system?

Answer 14

Four wires, three phase with a neutral conductor

Question 15

What is V phase construction?

Answer 15

it is a two phase tap line with a neutral that serves light three-phase loads

Question 16

On what circuit type is V phase construction commonly found?

Answer 16

WYE system

Question 17

Distribution lines consist of three main elements or levels. What are they?

Answer 17

Primary, secondary, and service

Question 18

Describe a primary line.

Answer 18

High voltage distribution line

Question 19

Describe a secondary line.

Answer 19

Low voltage lines pole to pole lines

Question 20

On an overhead system secondary runs pole to pole, what is the underground equivalent?

Answer 20

padmount to pedestal

Question 21

Describe a service line.

Answer 21

low voltage lines pole or pedestal to customer

Question 22

Underground systems are normally designed so each transformer can be served from two directions, What is this known as?

Answer 22

Loop design

Question 23

What are the two benefits of a loop design?

Answer 23

improves reliability and convenient for line crews to work on the system

Question 24

What is the voltage range for secondary?

Answer 24

120-480 V

Question 25

What determines the number of customers on a circuit?

Answer 25

density of area, type of customers, and capacity of circuit

Question 26

Utilities have four classifications of customers. What are they?

Answer 26

Residential, commercial, agricultural, and industrial

Question 27

What are utilities obligated to provide to customers?

Answer 27

Acceptable voltages at the meter

Question 28

What is the acceptable voltage range at the meter?

Answer 28

114-126 V

Question 29

How much more expensive are underground systems compared to overhead?

Answer 29

4x

Question 30

T or F: Most circuits are either entirely overhead or entirely underground.

Answer 30

False, MOST circuits are a combination of both.

Question 31

What is the height range for distribution poles?

Answer 31

35 - 55

Question 32

What materials can distribution poles be made from?

Answer 32

Fiberglass, wood, and steel

Question 33

T or F: Primary lines are only found on the main line.

Answer 33

False

Question 34

Name the distribution component being described. | Made from either wood of fiberglass and supported by braces/brackets.

Answer 34

Crossarms

Question 35

Name the distribution component being described. | Made from porcelain or polymer and used to support the conductor.

Answer 35

Insulator

Question 36

Name the distribution component being described. Made from porcelain or polymer and offers more contact area at the point of attachment and used with larger conductors.

Answer 36

Post insulator

Question 37

Conductor sizes have increased over the years. Why?

Answer 37

Deliver larger amounts of power and reduce line loss

Question 38

As the number of customers decreases down the line what happens to the conductor?

Answer 38

Gets smaller

Question 39

The ultimate destination of nearly all power lines and is more than meets the eye.

Answer 39

Transformer or transformer bank

Question 40

What category do the following components belong to? Fused cutout switches, reclosers, sectionalizers, and lightning arresters

Answer 40

Protective equipment

Question 41

Name the distribution component being described. Protects from faults, burns out and falls open. Allows linemen to quickly find faults.

Answer 41

Fused Cutout Switch

Question 42

Name the distribution component being described. An in-line device that can determine whether a fault is temporary or permanent by performing its function up to four time.

Answer 42

Recloser

Question 43

Name the distribution component being described. Installed to clear faulted sections from the line and are coordinated with reclosers.

Answer 43

Sectionalizers

Question 44

Name the distribution component being described. Used to protect the line from surges by diverting them to the ground.

Answer 44

Lightning or Surge Arresters

Question 45

Name the distribution component being described. | Can automatically control voltage levels.

Answer 45

Voltage regulator

Question 46

Name the distribution component being described. Used to improve the efficiency of the circuit. They reduce the flow of power that does not perform any useful function.

Answer 46

Capacitors

Question 47

Name the distribution component being described. Used to counteract the negative effects of inductive reactance. Can be manually or automatically controlled.

Answer 47

Capacitors

Question 48

Name the distribution component being described. Placed throughout the main line to redirect power or sectionalize a portion of a line. Can only be used manually.

Answer 48

Gang Operated Switches

Question 49

What are the common classifications for underground equipment?

Answer 49

padmounted or subsurface

Question 50

The term for underground lines.

Answer 50

Cable

Question 51

Most utilities install underground cables in what?

Answer 51

Conduit

Question 52

Broad term used to classify various types of concrete, fiberglass, or composite-type housing, which are used to splice cables, terminate cables, or house equipment.

Answer 52

Enclosures

Question 53

Name the underground component being described. Larger concrete structures, which are typically installed in larger cities to house heavy cables and equipment.

Answer 53

Manholes

Question 54

Name the underground component being described. Above ground and are used to splice low voltage secondary and service conductors.

Answer 54

Pedestals

Question 55

Name the underground component being described. Classified as either padmount or subsurface, the single-phase units are combined into one three-phase unit.

Answer 55

Transformer

Question 56

Term used to identify a pole where there is a transition from an overhead circuit to an underground circuit or vice versa.

Answer 56

Riser/Dip pole

Question 57

T or F: A utility does not need to get legal rights to construct and maintain lines.

Answer 57

False

Question 58

Name the circuit design being described. In this design, the circuits are independent and radiate into the service area. This design is the least reliable.

Answer 58

Radial

Question 59

Name the circuit design being described. In this design the circuits can be connected together automatically or manually at one or more points and can be fed from adjacent circuits.

Answer 59

Radial Tie

Question 60

Name the circuit design being described. In this design, the circuits are connected together as well as transformers and runs low-voltage three-phase. Extremely reliable.

Answer 60

Network Grid Design

Question 61

The most reliable but also the most expensive circuit design.

Answer 61

Network Grid Design