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Electrical grid 1 test 3 > electrical grid 1 test 3 > Flashcards

electrical grid 1 test 3 Flashcards

1
Q

main grid voltage ranges from?

A

765 KV - 230 KV

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2
Q

sub-transmission voltages ranges?

A

138 KV - 44 KV

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3
Q

what substation is the only substation that bumps the power up?

A

Generation substation

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4
Q

what is a static wire?

A

is a ground wire

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5
Q

what is a shield wire?

A

a ground wire with fiber optic core

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6
Q

how much do conductors weigh per foot?

A

2 - 1/2 lbs per foot

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7
Q

what diameter are the conductors used?

A

1 - 3/4 inches in diameter

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8
Q

a lattice type structure is used on what voltages?

A

345 KV lines and above

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9
Q

wooden pole structures are used on what voltages?

A

345 KV and below

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10
Q

two materials used on insulators today?

A

polymer and porcelain

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11
Q

what is a bundle?

A

more then one conductor per phase

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12
Q

what are used to change voltage from one to another?

A

power transformer

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13
Q

what does LTC stand for?

A

load tap changer

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14
Q

what does a Load Tap changer do?

A

to cut in or out a portion of the transformer winding which adjusts the voltage to the canditions

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15
Q

what is used to connect and disconnect lines and equipment?

A

circuit breakers

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16
Q

what is designed to interrupt large amounts of current and typically use oil, air, vacuum or sulfur hexafloride gas to accomplish the operation?

A

circuit breakers

17
Q

what is used to change the voltage from one level to another and can contain large amounts of mineral oil?

A

power transformers

18
Q

what is installed in substations in order to isolate lines and equipment to be worked on?

A

disconnect switches

19
Q

what does P.T. stand for?

A

potential

20
Q

P.T is?

A

reduction in voltage

21
Q

what does C.T. stand for?

A

current

22
Q

these devices are used to automatically adjust voltage as required.

A

voltage regulator

23
Q

what provides a path for lightning strikes at substations?

A

ground grid

24
Q

insulators support what?

A

conductors

25
Q

what is the more aesthetically pleasing alternative to wooden poles?

A

tubular steel poles

Electrical grid 1 test 3 (3 decks)

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