The actual application is PLC input cards, where a 3rd party's output is negative and our input cards are positive with power being drawing from 24VDC batteries. I have tried back of the napkin drawings to only get deer in the headlights looks.
I was hoping someone knew of some material or...
I have tried to explain DC negative vs positive inputs to a bunch of sales guys. Let's just say I have not been very succesful. Does anyone know of a site that has some elementary information that I can send them to or some info I could use to help get this across.
" I have never seen a transfer switch rated for service entrance. "
These are made by several mfg's but of different designs. CH, ASCO, Russel, Thompson some use breaker pairs some use a breaker in conjunction with a traditional UL listed contactor based ATS.
A pdf of the system is attached with identifying info redacted. The utility told us about their requirements or new requirements nearly 2 years after the system was installed. As stated earlier they reviewed and approved the drawings before the system was manufactured. TX PUC does not specify...
DPC
If we didn't install the aux pt's the utility signal would be shifted 30 degrees due to the Y-Y vs Open Delta and all of the generators, Utility board buses and Utility breaker PT's feed the synchronizing controls. The synch controls ,possibley, could be adjusted to account for this shift...
The system is designed for Utility parallel, so if you used opend delta on the Gens and Y-Y on the utility you would have to accomodate for the phase shift. What we are going to do is install Open delta PT's with a a 1:1 ratio on the secondary of the Y-Y. This is the most cost effective option...
Bear in mind that this system can accomodate up to 12 gens and with 4 utility feeds, plus gen tie breakers. This adds up to 26 sets of PT's, which are used for paralleling controls protective and metering information. The costs of PT's is substantial. However, the project was specified, bid...
Hello all,
My first post here, so if I leave anything out let me know. I am dealing with a utility that is demanding we install wye-wye pts for protective relaying in our gear. We are connecting to the utlity with 5 2.2MW gens at 13.2kV. We have capacity for up to 12. The system will be...
