Likely an inadvertent parallel between systems 1 and 2, causing the two chargers to fight each other; one way to track down where the tie path is is by the sectionalizing method.
If memory serves, the way forward is to create a switching and checking sequence that progresses through all...
Yeah, saw traces several times over the course of my career.
My utility's practice predominantly favoured placing transformers on potential using high side disconnect switches designed for the purpose; the charging currents tended to be mitigated by the resistance in air of the arcs when they...
Ah, that's what you meant; difference of terminology, I guess.
I picked up many an interrupted feeder over the course of my career, but it was never part of our jargon, ever, to refer to feeder cold load pick-up current as supplied by a trafo's secondary windings as any kind of "inrush;" that...
Um . . . what am I missing? Typo?
I was referring to the "conventional" configuration in my response, and specifically intended to say "placing on potential with the secondary [ LT ] breaker, and loading on the HT side by some appropriate means."
I have also seen GSU Txs direct connected to...
Not unless you're energizing from the low tension side, then loading on the high tension side . . . which I've seen done as a routine practice often enough to not flat-out dismiss the possibility.
Possibly, but only if you post your query in the correct forum; this isn't it.
Please re-post in an appropriate forum for your topic and delete this one.
Most AsHJ don't want to see parallels with shore at all; they more or less ubiquitously stipulate break before make, in both directions. That being said, though, with a demonstrable need for make before break and appropriate measures and precautions, parallels with shore may be permitted, but...
I figured Bill would describe it better than I ever could, and I was right.
The only codicil I might add would be to suggest having a zero load speed of 50.75 / 60.9 Hz on all units, such that the frequency will be at nominal when system load is 50% with all units loaded at 50%. That way...
Using two breakers in series provides additional redundancy in terms of being able to still break bus parallel if one bus tie breaker should fail to open on command during switching. Breaker fail schemes also benefit from having a second breaker.
However, providing two breakers in series...
