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.

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
What is used to protect transmission lines from lightnin?
Shielding or static wire
26
What is shielding and static wire?
Lightning protection in the form of small conductors, attached to the top of transmission structures. Either one or two.
27
Besides lightning protection what other purpose do shielding wires do?
Communication, as they are also built with fiber optics inside them
28
T or F: A company needs to obtain legal rights to construct and maintain lines.
True
29
How long can it take to secure right-of-ways to build major transmission lines?
3-5 years
30
Why are right-of-ways difficult to obtain?
Objections of property owners
31
The use of the land underneath transmission lines is very restricted. What is usually not allowed?
Buildings
32
Transmission right-of-ways has to be wider than what?
The entire transmission structure
33
Transmission insulators can be constructed from several different materials but generally have only two different shapes. What are they?
Suspension and line post
34
What is the max specs of a transmission conductor?
1-3/4" dia and weight 2.5 lbs per foot