Bus/Jumpers – Types Flashcards

1
Q

The most common type of substation in use today is the air-insulated type.

A

True

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2
Q

Common names given to bus types are main bus, ring bus, and ? bus.

A

transfer

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3
Q

One of the common methods to make connections to aluminum tubular bus is with ? .

A

Tungsten Inert Gas (TIG) welding

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4
Q

Older substations with copper rigid bus systems use welded connections.

A

False

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5
Q

Minor defects in rigid bus may be repaired by ? .

A

filing, then polishing with a fine emery cloth

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6
Q

A ? is a flexible bus consisting of a stranded conductor strung between substation structures and may be supported by suspension insulators.

A

strain bus-bar

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7
Q

Insulated bus-bar is a rigid tubular aluminum conductor installed in a larger metal tube, filled with high pressure ? gas.

A

sulfur hexafluoride

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8
Q

The type of substation bus that is a rigid bar supported by insulators and covered by a grounded metal shield is the ? bus-bar.

A

insulated-phase

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9
Q

The most common types of rigid bus-bar used in substations are flat, hollow tube aluminum, and ? .

A

angle

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10
Q

Where high-current substations are built, ? bus-bars are used because its shape allows heat to dissipate more efficiently.

A

hollow tube

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11
Q

Strain type bus-bars are used in substations primarily for ? conductors.

A

high voltage transmission

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12
Q

Hollow tube aluminum bus is the easiest type to connect to with bolt-on jumpers.

A

false

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13
Q

Because of the lower voltages on the secondary side of a transformer, a ? bus allows for closer spacing and is easier to connect with bolt-on jumpers.

A

flat or angle aluminum

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14
Q

If the load is heavy enough, two or three large copper conductors may be used per phase as jumpers.

A

true

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15
Q

Expansion and contraction of rigid bus-bars due to load variation and ambient temperature changes are small amounts and are generally disregarded by designers.

A

False

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16
Q

If multiple or parallel jumpers are used on the same phase, they must be ? .

A

bolted or wired together

17
Q

Vibration of substation buses will occur if the spans are long enough to vibrate and the ? .

A

wind blows across the bus at right angles

18
Q

Only round hollow aluminum substation buses will vibrate.

A

False

19
Q

A substation bus will vibrate because the supporting insulators are rigid and cannot absorb any vibrations.

A

False

20
Q

If a four-inch hollow tube bus is used, the support separation can be up to ? before damping should be used.

A

17’