Features of HV Cables

Question 1

What is the most common insulation material used in medium-voltage cables?

Answer 1

XLPE

Question 2

What are four common types of HV cables?

Answer 2

• Teck
• Concentric Neutral
• Shielded Power Cable
• PILC

Question 3

A dielectric is more commonly known as a(n) ________

Answer 3

Insulator

Question 4

What is dielectric strength, and in what units is it typically stated?

Answer 4

The ability of an insulation to withstand electric stress. Units could be volts/mil, kV/in, kV/mm, etc

Question 5

What are the two types of shielding used on a HV cable?

Answer 5

• Strand shield

- Insulation shield

Question 6

Which of the cable shields must be grounded?

Answer 6

the insulation shield

Question 7

What is the primary purpose of lead sheathing on a cable?

Answer 7

To keep moisture out

Question 8

What is the secondary purpose of a lead sheath on a cable?

Answer 8

To provide mechanical protection, to serve as the metallic part of the insulation shield, or to provide corrosion resistance

Question 9

What are the two classes of insulation levels found on medium-voltage cables?

Answer 9

100% and 133%

Question 10

What is the function of cable armour?

Answer 10

To protect the cable from mechanical damage