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Year 1 Substation 6 > Cable Types > Flashcards

Cable Types Flashcards

1
Q

What type of conductor is this?

A

Annular

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2
Q

What type of conductor is generally used for sizes above 1,000 kcmils?

A

Annular

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3
Q

What type of conductor is this?

A

Concentric Round

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4
Q

How many conductors are added on each layer of a concentric round conductor?

A

6

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5
Q

What type of conductor is this?

A

Compact Round

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6
Q

What are the advantages of Compact Round cable?

A

Less weight
Smaller outside diameter

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7
Q

What are the disadvantages of Compact Round cable?

A

Less Flexible

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8
Q

What type of cable is this?

A

Compact Sector

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9
Q

What is the purpose of the compact sector shape?

A

Obtain a smaller diameter

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10
Q

What are the advantages of compact sector shape?

A

Low reactance, lower voltage drop, and smaller cable diameters.

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11
Q

What type of cable is this?

A

Segmental

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12
Q

What is the advantage of segmental configuration?

A

Reduce skin effect

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13
Q

label the image

A

A. jacket
B. insulation
C. conductor strand shield
D. conductor

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14
Q

Label the image

A

A. Jacket
B. Bedding Tape
C. Metallic Shield
D. Semi-Conductor
E. Insulation
F. Strand Shield
G. Conductor

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15
Q

Unshielded cable use is normally limited to ? .

A

7.2 kV

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16
Q

What is the purpose of strand shielding?

A

To prevent electrical breakdown of the insulation, due to the ionization of the air gap between the insulation and the conductor

17
Q

What is the purpose of the Insulation shielding?

A

When the conductor is laid on the ground, the magnetic field is concentrated on the bottom of the conductor. A metallic shield wrapped around the insulation of the conductor to allow a grounded surface to uniformly contain the magnetic field.

18
Q

Strand shielding is made from ? materials.

A

semiconducting

19
Q

Large power cables use ? , which makes the cable flexible.

A

stranded conductors

20
Q

Copper conductors have a higher conductivity than aluminum.

A

true

21
Q

Aluminum conductors can be damaged by ? when touching other metals in the presence of water.

A

galvanic reaction

22
Q

Three of the most common materials used as insulation for power cables are taped insulation, thermoplastics, and ? .

A

rubber

23
Q

Voltage, current, and ambient temperature are three factors used to determine the type of cable insulation for a specific use.

A

true

24
Q

Cable with impregnated-paper insulation has a ? sheath.

A

lead

25
Q

Bedding tapes are used in cables to add mechanical strength.

A

true

26
Q

Lead sheathing is the most effective type of protection for insulation against moisture, weather, and oxidation.

A

true

Year 1 Substation 6 (13 decks)

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