Section 2

Question 1

A switch is a device used to stop or change the direction of the flow of current

Answer 1

True

Question 2

Fault conditions

Answer 2

When the voltage or current on the line rises above or drops below a preset rang causing switches with fault interrupting abilities to stop the flow of current

Question 3

Isolating equipment

Answer 3

Line crews do this to safely work on a piece of equipment or section of line, by using switches to stop or change the direction or the flow of current

Question 4

Circuit breakers

Answer 4

An equipment protection device which can interrupt circuits under normal load conditions, or under fault conditions

Question 5

Circuit switchers

Answer 5

Type of switch used on high-voltage side of a substation transformer in low fault condition areas

Question 6

Fuses

Answer 6

The simplest and most common protection device

Question 7

Fused cutouts

Answer 7

Type of switch that uses an expulsion cartridge with a removable fuse element

Question 8

Reclosers

Answer 8

Used for the same purpose as circuit breakers only in areas where the fall current is not as high

Question 9

Disconnects

Answer 9

Type of switch used to isolate equipment or lines and provide a visual break between an energize line and a Denergized piece of equipment or section of line

Question 10

Load brake switches

Answer 10

Type of switch used to interrupt normal load current not fall current

Question 11

Sectionalizers

Answer 11

Used to isolate a section of line after the line has been deenergized

Question 12

A circuit breaker can interrupt circuits under normal load, but not fall conditions

Answer 12

False

Question 13

Circuit breakers are normally located in substation in switch yards

Answer 13

True

Question 14

A circuit breaker interrupts a circuit by moving electrical contacts apart and controlling the arc that occurs when the contacts are separated

Answer 14

True

Question 15

There are how many dielectric mediums used in substation circuit breakers

Answer 15

Four

Question 16

Utility companies use circuit breakers instead of circuit switchers on high voltage, side of transformer and low fault condition areas

Answer 16

False 

Question 17

There are how many main parts to a circuit switcher

Answer 17

Three 

Question 18

The interrupting mechanism controls the opening and closing functions of the interrupting chamber

Answer 18

True

Question 19

The interrupting chamber, houses the contacts

Answer 19

True

Question 20

When the contacts are opened, the SF6 gas will not extinguish the Arc forms 

Answer 20

False

Question 21

Lack of oxygen in the chamber prevents the arc from forming

Answer 21

True

Question 22

Typically the control unit is motor driven

Answer 22

True

Question 23

Circuit switches, have no way of providing a visual break

Answer 23

False

Question 24

A what is the simplest and most common protective device used today?

Answer 24

Fuses

Question 25

Under normal conditions, the fuse has no effect on the system

Answer 25

True

Question 26

The most important part of the fuse, is it what that melts to interrupt the current flow

Answer 26

Elements

Question 27

When a fuse blows a what forms were the element melts apart

Answer 27

Arc

Question 28

Fuses extinguish arcs using different types of mediums, such as air liquid and what

Answer 28

Sand

Question 29

Fuse ratings are expressed in what

Answer 29

Amps

Question 30

Fuses are rated by

Answer 30

Normal operating voltage, continuous current rating interrupting rating

Question 31

A fuse blows when the current flowing through the circuit is the same as the continuous current rating

Answer 31

True 

Question 32

Two main types of fuses are

Answer 32

Plug and cartridge

Question 33

Plug fuses have a current rating up to how many amps

Answer 33

30

Question 34

There are three types of cartridge, fuses, liquid expulsion, and what

Answer 34

Current limiting

Question 35

Liquid fuses contain oil to extinguish the arc

Answer 35

True

Question 36

Expulsion fuses are rated up to 15,000 amps

Answer 36

False

Question 37

Current limiting fuses are the fastest operating fuse

Answer 37

True

Question 38

A fused cut out, provides a visible break in the line

Answer 38

True

Question 39

A fuse holder has the upper and lower contact

Answer 39

True

Question 40

The fuse, door can at times stick in the closed position, even though the fuse is blown

Answer 40

True 

Question 41

A recloser can be used as a load brake device

Answer 41

True

Question 42

The two types of re-closers are

Answer 42

Hydraulic an electronic

Question 43

The contacts of both types of re-closures are immersed in oil

Answer 43

True

Question 44

Settling of the fall trip piston enables the recloser to forget that a temporary fault occurred 

Answer 44

True

Question 45

Gang operated switches are also referred to as

Answer 45

GDAB

Question 46

There are how many different types of load brake switches

Answer 46

4

Question 47

Each load break switch is classified according to the method used to extinguish an ark

Answer 47

True

Question 48

Air brake switches have arcing horns

Answer 48

True

Question 49

SF6 load brake switch is Kim cool, and increase the path of an arc

Answer 49

True

Question 50

Oil, load, brake switches have their interrupting mechanism inside a chamber filled with sand

Answer 50

False