No they are not going to protect any ill-fated worker that comes in contact with them.
But as you noticed in the video the bodies lay there burning for several minutes. Had that been a short on the secondary of a 69Kv/230Kv transformer the secondary would have fused and passed 230Kv down the line resulting in massive destruction
And No, Stock Z28 they wouldn't work if they tried to monitor voltage to ground since grid goes out as a floating delta.
That was why the reference to 8 deg out of phase
If you look at it in the Polar Vector relationship between phases, as a single phase loads down or "lags" as in a short to ground condition the phase relationship changes.
And yes the typical 13.8Kv generator has phase failure protection. Just not on the generator tie breaker but rather the 13.8 / 69Kv transformer since most of the "Peaker Plants" tie in at that voltage
Hello,
The vast majority of gensets I test have no breaker. We connect directly to the armature output terminals.
Some do have ECM supervised protection for monitoring a lot of factors- voltage-power factor-current- phase relation ship- freq. etc., but they are rare. They are pretty nice, but you would still be shocked badly.
We build mostly prime or stand by gensets, but I am sure some are used for peak comensation.
I am almost always working on the generator to breaker side of the system so I dont see a lot of fault protection on a typical genset.
The voltages range from 400 to the 13800 and the current in excess of 4000 amps on some units. Usually a max of 90 HZ..
As I said I am certainly no expert but I dont see any form of protection on the gen side on most systems I test.
Its an impressive amout of power. Atleast to me.
