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The number of discs in a string of insulators for 400 kV ac overhead transmission line lies in the range of
- a)32 to 33
- b)22 to 23
- c)15 to 16
- d)9 to 23
Correct answer is option 'B'. Can you explain this answer?
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The number of discs in a string of insulators for 400 kV ac overhead t...
-The number of discs in a string of insulators for 400 kV ac overhead transmission line lies in the range of 22 to 23.
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-we know that each insulator disk can tolerate upto 11kv,for example when we want to find no. of 220kv,first find phase voltage for 220kv and then divided by 11kv. no. of discs=127/11=12.
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The number of discs in a string of insulators for 400 kV ac overhead t...
Insulators for Overhead Transmission Line
Insulators are used to support and isolate the conductors of overhead transmission lines from the supporting structures. The insulators used in high voltage transmission lines are made of porcelain or glass.
Factors Affecting the Number of Discs
The number of discs required for an insulator string depends on various factors such as:
- The voltage level of the transmission line
- The length of the insulator string
- The diameter of the conductor
- The type of insulator used
Calculation of the Number of Discs
The number of discs required for an insulator string can be calculated using the following formula:
n = (VL × L)/(D × K)
Where,
n = Number of discs
VL = Line voltage (kV)
L = Length of insulator string (m)
D = Diameter of conductor (cm)
K = String efficiency factor
For a 400 kV ac overhead transmission line, the number of discs in the insulator string lies in the range of 22 to 23. The exact number of discs required will depend on the specific design of the insulator and the other factors mentioned above.
Insulators are used to support and isolate the conductors of overhead transmission lines from the supporting structures. The insulators used in high voltage transmission lines are made of porcelain or glass.
Factors Affecting the Number of Discs
The number of discs required for an insulator string depends on various factors such as:
- The voltage level of the transmission line
- The length of the insulator string
- The diameter of the conductor
- The type of insulator used
Calculation of the Number of Discs
The number of discs required for an insulator string can be calculated using the following formula:
n = (VL × L)/(D × K)
Where,
n = Number of discs
VL = Line voltage (kV)
L = Length of insulator string (m)
D = Diameter of conductor (cm)
K = String efficiency factor
For a 400 kV ac overhead transmission line, the number of discs in the insulator string lies in the range of 22 to 23. The exact number of discs required will depend on the specific design of the insulator and the other factors mentioned above.
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The number of discs in a string of insulators for 400 kV ac overhead transmission line lies in the range ofa)32 to 33b)22 to 23c)15 to 16d)9 to 23Correct answer is option 'B'. Can you explain this answer?
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