Cram for Exam Vol 3 Q 19 - Reducing transmission line inductive reactance

akyip said:

Hi guys,

I just want to make sure I correctly understand something regarding transmission line inductive reactance.

On Cram for Exam Vol 3, question 19 asks which answer choice would not reduce the line's inductive reactance. The correct answer choice is "Lower Transmission voltages."

The explanation in the solution is that raising transmission voltages raises the line's inductive reactance. Is this because the voltage drop across a line will drop, and thus the inductive reactance would drop since Vdrop = I * Xline? I'm just trying to understand this correctly.

Thank you to anyone who helps with this!

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akyip said:

Is this because the voltage drop across a line will drop, and thus the inductive reactance would drop since Vdrop = I * Xline? I'm just trying to understand this correctly.

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Dude99 said:

or does increasing V increase shunt C offsetting or 'lowering' apparent XL???

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akyip said:

Guys,

Thank you for your responses. Cram's solutions did not explain this at all (it only said which answer choice was not a true statement), but I should've thought of the P = Vs * Vr / XL equation that Dude99 mentioned. That makes sense now.

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Chattaneer PE said:

My initial thought was that voltage has no correlation to the inductive reactance. Also, just because answer B was false, doesn't make the opposite true. But then I read the answer key and was confused. Good to hear the reasoning behind it. 

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