Hi folks,
Please, what is the usual practice for the ANSI 51 pick up for 4.16kV industrial (radial) feeders ?
I have read people saying from 10% to 600% of the ampacity, a bit confusing,
Thanks a lot,
Mongao
Hi Guys,
I have to protect a feeder with SEL-751, I was asked to do 50N and 51N,
On the source side, the feeder is connected to the NGR-grounded-Wye side of a Delta-Wye transformer; on the load side it is connected to the Delta side of a Delta-Wye grounded transformer, so there is no steady...
Hi all,
Please, does anyone know how to make the motor starting curve appear in ETAP's Star view ? When I "drag n drop" the motor symbol to Star, it only shows the motor cable damage line, it doesn't bring in the starting curve.
I have indeed tried running a starting study before...
Hi friends,
I need to understand the SIEMENS relay 7SJ640, it has 3 "ANSI 50" functions called 50-1, 50-2 and 50-3.
Please, how do these functions work together ? Let's say for example that I want the relay to trip the breaker instantaneously if the current reach 1200 A, how should these 3...
Hi all,
I am now using ETAP for the second time in my life, so I am not really used to it. I have added some busses to an existing system, but when I try to solve the flow ETAP gives me this message, saying that many busses base voltages differ more than 40% from the nominal voltages.
The...
Dear friends,
I am investigating differences between live and dead tank breakers when specifying the equipment for purchase.
Apart from the obvious absence of CT's in live tank breakers, are there any other significant differences between them ? How would a live tank specification differ from...
Dear all,
I am in search of information related to voltage operating limits in North America, more specifically switchgears and motor terminals.
ANSI C84.1 separates voltage limits in two categories, "service" and "utilization" voltages; but these refer to the voltage levels in buses...
