It is same concept, just a tap to a different potential in the same coil. Bucking/boosting a steady non-changing voltage is what I was trying to indicate that they are for.
If you use them for voltage drop compensation on a non steady voltage you will over or under compensate at different load levels.
If voltage is going to remain at a particular level the majority of the time, you at least need to compensate from that level, but beware of what the high/low may be at other times and plan accordingly if it will be a problem.
Yes, transformers do not regulate as many wish they would. Since transfortmer pri and sec windings are proportional ( aa specific ratio) so are the pri and sec voltages. The only reference to transformer regulation is the transformer impedance which relates to the transformer's ability to maintain that the voltage ratio throughout the variation transformer loading.
I know that I am preaching to the choir but transformers are not regulators and based upon that primary voltage this is dependent upon the load the primary voltage which is commonly higher with less load. Since transformers are proportional the secondary voltage thern would be higher. To get a consistent secondary voltage there wouid have to be consistancy all the way back through the POCO.
No matter what we do we are always compromising as best as we can for the common 40degC calibrated breaker which carries 100% of its rating at 40dergC and then installed in a 25degC ambient temperature and sometimes even lower to protect wire running in a very hot attic I often wonder why we can even protect wire affectively at all.
If there is an attempt to fine tune a distribution system such as regulation of voltages , circuit protection, etc, I think we would be frustrasted as is attempting to compensate for voltage variation in a distribution system.
