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NLC ELP Rig & EG1 > EG1 CH.8 > Flashcards

EG1 CH.8 Flashcards

1
Q

What is the transmission system similar too?

A

The interconnected highways

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2
Q

T or F: Transmission lines can be local or travel cross country

A

True

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3
Q

What is a tell tale sign you are looking at a transmission line?

A

Large tall structures

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4
Q

On average how far apart are transmission towers?

A

1000 feet

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5
Q

What metal is used for transmission lines?

A

Aluminum

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6
Q

What is the main objective of transmission lines?

A

deliver power with a minimal loss

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7
Q

How often is power bought and/or sold?

A

daily

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8
Q

What determines the amount of power on transmission lines?

A

Depends on scheduled and emergency deliveries.

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9
Q

What types of current can transmission lines be?

A

AC or DC

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10
Q

What type of current is most transmission lines?

A

AC

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11
Q

When would DC be used instead of AC for transmission lines?

A

When large amounts of power is needed far away and is profitable for the utility.

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12
Q

What are some considerations when determining transmission structures?

A

Voltage of line, right of way size, geographical terrain, weather, and size of conductor

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13
Q

What is the max voltage for wooden transmission structures?

A

345 kV

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14
Q

Why do wooden structures have a max voltage?

A

Limited by pole sizes available

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15
Q

What are some advantages of tubular steel poles compared to wooden poles?

A

aesthetically pleasing and longer life span

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16
Q

What is the preferred structure type for voltages over 345 kV?

A

Lattice type towers

17
Q

What must the insulators do?

A

They must insulate the line and support the weight of the conductors

18
Q

What so suspension insulators do?

A

They are used to support the full line tension in a dead end or to support the span weight

19
Q

T of F: A dead end insulator would typically have a lower rating then an insulator in a suspension setup.

A

False, the rating would be higher

20
Q

T or F: Transmission lines use steel lines for support.

A

True

21
Q

When would you see bundled conductors?

A

When transmission lines deliver extra high voltages

22
Q

What is a bundle conductor?

A

A bundle conductor is when there are more than one conductor in one phase

23
Q

Why bundle a conductor?

A

reduce radio noise and corona loss

24
Q

What is corona loss?

A

refers to the phenomena in which the air ionizes around high voltage lines. Corona loss is audible and visible at night.

25
Q

What is used to protect transmission lines from lightnin?

A

Shielding or static wire

26
Q

What is shielding and static wire?

A

Lightning protection in the form of small conductors, attached to the top of transmission structures. Either one or two.

27
Q

Besides lightning protection what other purpose do shielding wires do?

A

Communication, as they are also built with fiber optics inside them

28
Q

T or F: A company needs to obtain legal rights to construct and maintain lines.

A

True

29
Q

How long can it take to secure right-of-ways to build major transmission lines?

A

3-5 years

30
Q

Why are right-of-ways difficult to obtain?

A

Objections of property owners

31
Q

The use of the land underneath transmission lines is very restricted. What is usually not allowed?

A

Buildings

32
Q

Transmission right-of-ways has to be wider than what?

A

The entire transmission structure

33
Q

Transmission insulators can be constructed from several different materials but generally have only two different shapes. What are they?

A

Suspension and line post

34
Q

What is the max specs of a transmission conductor?

A

1-3/4” dia and weight 2.5 lbs per foot

NLC ELP Rig & EG1 (19 decks)

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