The insulation strength of EHV lines is mainly governed by

The insulation strength of EHV lines is mainly governed by 

 (a) Switching overvoltages (b) Lightning overvoltages (c) Power frequency overvoltages (d) Dynamic overvoltages 
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2 Answers

Answer :

The insulation strength of an EHV transmission line is mainly governed by switching over-voltages

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Answer :

1

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Related questions

The insulation of modern EHV lines is designed based on?

Description : The insulation of modern EHV lines is designed based on?

Last Answer : The insulation of modern EHV lines is designed based on switching voltage.

What for series and shunt compensation provided in EHV transmission lines?

Description : What for series and shunt compensation provided in EHV transmission lines?

Last Answer : Answer: Series capacitance is provided in EHV lines to artificially reduce the series reactance of the line so as to improve stability, voltage regulation and transmission efficiency Shunt compensation ... reduce the line susceptance so as to improve the voltage regulation under light load condition

In order to switch-off and EHV circuit for maintenance, the following sequence is adopted:

Description : In order to switch-off and EHV circuit for maintenance, the following sequence is adopted: (1) Open the circuit breaker, open the isolator, operate the earth switch (2) Operate the earth switch, ... open the circuit breaker (4) Open the isolator, open the circuit breaker, operate the earth switch 

Last Answer : 1

HVDC transmission is preferred to EHV AC because

Description : HVDC transmission is preferred to EHV AC because  (a) HVDC terminal equipments are inexpensive  (b) VAR compensation is not required in HVDC systems  (c) System stability can be improved  (d) Harmonic problem is avoided 

Last Answer : C- system stability can be improved

Why EHV busbars are hallowed and circular?

Description : Why EHV busbars are hallowed and circular?

Last Answer : Answer: To avoid corona effect

What are the problems associated with EHV transmission?

Description : What are the problems associated with EHV transmission?

Last Answer : Answer: The problems associated with EHV transmission are corona loss and radio interference, requirement of heavy supporting structures and insulation requirments

For enhancing the power transmission in along EHV transmission line, the most preferred method is to

Description : For enhancing the power transmission in along EHV transmission line, the most preferred method is to connect a  (A) Series inductive compensator in the line (B) Shunt inductive compensator at the ... (C) Series capacitive compensator in the line (D) Shunt capacitive compensator at the sending end

Last Answer : For enhancing the power transmission in along EHV transmission line, the most preferred method is to connect a Series capacitive compensator in the line

Earth wire on EHV overhead transmission line is provided to protect the line against:

Description : Earth wire on EHV overhead transmission line is provided to protect the line against:

Last Answer : Earth wire on EHV overhead transmission line is provided to protect the line against: lightening surge

Shunt compensation in an EHV line is used to

Description : Shunt compensation in an EHV line is used to (A) Improve stability. (B) Improve the voltage profile. (C) Reduce the fault level. (D) Substitute for synchronous phase modifier.

Last Answer : Shunt compensation in an EHV line is used to Improve the voltage profile.

Series capacitive compensation in EHV transmission line is used to

Description : Series capacitive compensation in EHV transmission line is used to

Last Answer : To maintain voltage stability 

The atmosphere is heated mainly by – (1) Insulation (2) Conduction (3) Radiation (4) Convection

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Bundled conductors are mainly used in high voltage overhead transmission lines to

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Last Answer : Bundled conductors are mainly used in high voltage overhead transmission lines to Reduce corona 

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