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year 3 lineman final > Section 2 > Flashcards

Section 2 Flashcards

1
Q

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

A

True

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2
Q

Fault conditions

A

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

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3
Q

Isolating equipment

A

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

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4
Q

Circuit breakers

A

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

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5
Q

Circuit switchers

A

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

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6
Q

Fuses

A

The simplest and most common protection device

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7
Q

Fused cutouts

A

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

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8
Q

Reclosers

A

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

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9
Q

Disconnects

A

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

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10
Q

Load brake switches

A

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

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11
Q

Sectionalizers

A

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

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12
Q

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

A

False

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13
Q

Circuit breakers are normally located in substation in switch yards

A

True

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14
Q

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

A

True

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15
Q

There are how many dielectric mediums used in substation circuit breakers

A

Four

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16
Q

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

A

False 

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17
Q

There are how many main parts to a circuit switcher

A

Three 

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18
Q

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

A

True

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19
Q

The interrupting chamber, houses the contacts

A

True

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20
Q

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

A

False

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21
Q

Lack of oxygen in the chamber prevents the arc from forming

A

True

22
Q

Typically the control unit is motor driven

A

True

23
Q

Circuit switches, have no way of providing a visual break

A

False

24
Q

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

A

Fuses

25
Q

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

A

True

26
Q

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

A

Elements

27
Q

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

A

Arc

28
Q

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

A

Sand

29
Q

Fuse ratings are expressed in what

A

Amps

30
Q

Fuses are rated by

A

Normal operating voltage, continuous current rating interrupting rating

31
Q

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

A

True 

32
Q

Two main types of fuses are

A

Plug and cartridge

33
Q

Plug fuses have a current rating up to how many amps

A

30

34
Q

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

A

Current limiting

35
Q

Liquid fuses contain oil to extinguish the arc

A

True

36
Q

Expulsion fuses are rated up to 15,000 amps

A

False

37
Q

Current limiting fuses are the fastest operating fuse

A

True

38
Q

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

A

True

39
Q

A fuse holder has the upper and lower contact

A

True

40
Q

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

A

True 

41
Q

A recloser can be used as a load brake device

A

True

42
Q

The two types of re-closers are

A

Hydraulic an electronic

43
Q

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

A

True

44
Q

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

A

True

45
Q

Gang operated switches are also referred to as

A

GDAB

46
Q

There are how many different types of load brake switches

A

4

47
Q

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

A

True

48
Q

Air brake switches have arcing horns

A

True

49
Q

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

A

True

50
Q

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

A

False

year 3 lineman final (3 decks)

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