Hi There
Could any one assist in replying to the following:
According to IEC 60034-1-1999 the THF of generator must be recorded using line-to-line voltages. The measured quantites during a test were however taken from phase-to-neutral values. Can the formula still apply? Unfortunately the...
Hi There
Could any one assist in replying to the following:
According to IEC 60034-1 the THF of generator must be recorded using line-to-line voltages. The measured quantites during a test were however taken from phase-to-neutral values. Can the formula still apply? Unfortunately the phase...
Peterb
Thanks for your comments and I know the next question is not directly related to the topic. In closing then, the feeders generally has lower CT ratios than the bus zone, yet they are subjected to the same fault current. Is it also your believe and experience that it could lead to...
peterb
What your are describing is true for "steady state" fault currents. (or that is how I understand it) The focus here is for transient conditions when X/R ratios and point of wave switching causes high DC offsets.
I am interested to plot the flux pattern and associated secondary...
Hello AusPow
I am also using DigSilent (rookie) and what you said are so true. A question for you though. Do you perhapas have a small *.dz file that could assist me in modelling CT saturation. Awaitng your comments.
Just want to add another real life condition. At one of our power stations the fault recorder installation was a retrofit. Not enough "protection CT" cores were available, however there was a "metering" CT core spare. With the low secondary burden measured and used in the...
CT saturation has become a very heated discussion in the last week or so in my work environment and it mainly revolves about the DC offset component.
We are in the process of replacing a 11kV board (metal clad switch gear) and new CTs are to be ordered as well. The main concern is the effect...
