capacitors along transmission lines maybe?

Mmm,

They are compensation to control voltage and power factor and they depends on load condition ( over voltage, undervoltage, swell and sag ).

Here

1- Series capacitors are sometimes installed in series with long EHV AC transmission lines to compensate line reactance.

2- Shunt Capacitors are installed near load points in distribution substation, receiving substations for improvement of power factor. Shunt capacitors are switched on during high inductive loads. They are switched off during low loads. Shunt capacitors are also include in static VAr sources(SVS)

3- Shunt Reactors are necessary with long EHV transmission line to compensate the reactive poewr of the line capacitiance during low loads.

4- Static VAr Sources (SVS) are theyristor controlled shunt capacitor and shunt reactors which give rapid, stepless control of reactive power. these are connted in receiving stations and distributions system

Sorry in above comment it is me and forgot to log in.

Mmm,

They are compensation to control voltage and power factor and they depends on load condition ( over voltage, undervoltage, swell and sag ).

Here

1- Series capacitors are sometimes installed in series with long EHV AC transmission lines to compensate line reactance.

2- Shunt Capacitors are installed near load points in distribution substation, receiving substations for improvement of power factor. Shunt capacitors are switched on during high inductive loads. They are switched off during low loads. Shunt capacitors are also include in static VAr sources(SVS)

3- Shunt Reactors are necessary with long EHV transmission line to compensate the reactive poewr of the line capacitiance during low loads.

4- Static VAr Sources (SVS) are theyristor controlled shunt capacitor and shunt reactors which give rapid, stepless control of reactive power. these are connted in receiving stations and distributions system

Can someone tell us something about typical values and ratings for parts typically employed by the HV transmission-line operator? Maybe parts nos, and links to datasheets, that would be nice?

excelent! your post answered my question and any follow up questions i would have asked! tyvm!

More than anything else, they use big synchronous condensers to stabilize their systems.

http://en.wikipedia.org/wiki/Synchronous_condenser

Cheers!
MZ

Guest,

The phrase "litz twisting" is unfamiliar to me. I am aware of litz wire for use with high-frequency signals when skin effect problems are severe. Regarding overhead transmission lines, particularly long ones, I believe that capacitive coupling between lines or from lines to ground is a much more serious loss problem than any inductive losses (particularly since the lines are strung in parallel). Please check your data or help by giving a good definition of the term.

--JMM