Given the Example Shown Below of a nominal 765 kV system and no other informatio

Question

Given the Example Shown Below of a nominal 765 kV system and no other information than what I said yesterday, what would you expect the voltage on the transmission line to be at the midpoint? (B) What is occurring in this system? Please be as specific as you can in your description. Would it be possible for the opposite to question 1 to occur (same system nominals), that is both sets of blue arrows (left and right) would be going into the middle of the line? Again, please be as specific as you can. B) Would there be a limit to this condition? That is may I select any value of reactive power to flow into the center of the line and what would occur if I could do so? Again, you need nothing additional to answer this question. (A) Explanation: (B) Explanation:

Explanation / Answer

1A)

Let VR= voltage at the receiving end

VS= voltage at the Sending end

From the Above system stated that Voltage at sending end is equal to the Voltage at the Receiving end

i.e VR= VS= 765KV

hence there is no Voltage drops takes place in the transmission line, Hence voltage throughout the transmission line is same

1B)

Negative sign of Var(i.e Reactive Power) is specified at Generator side (or Sending end side) which indicates that reactive power is delivered by the generator,

This Reactive power delivering is possible by making Synchronous Generator as a Over_Excited Machine (An Over_Excited synchronous machine will acts as a Synchronous Condenser)

The delivered Reactive Power is absorbed by the Recieving end bus bar

2A)

It is not possible of reactive power transfer in both directions to the line as specified in above system unless untill we will connect any phase advancers/reactive power Compensators

2B)

By using Reactive Power Compensators like Shunt Compensators or a Over excited synchronous Machine at mid point of transmission line we can able to inject the reactive power in system called as MID_POINT Compensation

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