Please don't consider this as an expertly advice. This is just my thoughts and hope it make sense.
Definitely both gensets can work together. But you'll have to consider a lot of things. What's the application? Parallel to the utility or isolated? What is the characteristic of the load and how...
The difference between the High Heat Value (HHV) and the Low Heat Value (LHV) is the Latent Heat of Vaporization (Evaporation). For natural gas it's about 10%. How about for landfill gas?
You're right David. The relay manufacturer confirmed that a 3-VT's connected YG-YG are enough for the 27/59, 81O/U & 59N functions that the utility company is requiring.
Thank you.
The 27/59, 81O/U and 59N are the relay function being required by the utility on the point of common coupling w/c is on the primary side of the GSU. These are necessary to avoid islanding the generator. Of course, there are more relay functions on the generator side of the system.
The CT...
Here's the latest on this project. The utility company blinks and wants the transformer configuration changed to delta-delta. Relay functions required for this are 27, 59, 81O/U and 59N. My question is since the sensing voltage transformers are in the high side, is it necessary to have the 59N...
I just want to be sure that I understood everyone correctly. So, in summary:
1. The transformer (YG-YG) will have be solidly grounded. (As in, just wire/connect the X0 terminal to ground.)
2. The generator neutral should be wired (connected) to the transformer neutral.
Here is what I'm not...
David,
A D-YG transformer is no longer an option at this point. In your 2nd option, both generator and transformer are solidly grounded and the neutral tied together? How about the concern on harmonics? How to live with the high fault current?
On the 3rd option, the set-up is generator-ckt...
Thanks for all the replies.
Originally, the GSU is intended to be D-YG. First, this was changed to YU-YG. Now, the utility company supplying the transformer is saying if the neutral bonding will be removed the transformer will lost the factory UL rating. That's why a YG-YG comes up.
The question...
On my question above, I'm referring to grounding the generator neutral. Is a floating neutral possible? Why and why not? If the neutral will be grounded, what are the options? Is reactance grounding better than resistance grounding? And, what if utility company requires to limit the zero...
Given a generator 1.6MW 480Y/277V 60Hz and a GSU transformer with primary and secondary windings wye connected, neutral internally tied and solidly grounded.
What is the best method of grounding and minimum protection (relaying) necessary for the generator?
I agree. It should be sufficient that the CCT's are from the same manufacturer, same model, same class, same ratings, etc. though may not be from the same batch.
It's a good point BJC. Because somebody might think that even though the breaker is switched off the "load" side of the breaker is de-energized. But since it's reversed fed, that "load" side might still be energized. A sign should be installed for safety and compliance to NEC.
If this is an isolated (from the utility) system you may not need a pf controller. Your options are either go for a cross-current compensation (where the cross-current transformers are interconnected to each other) or droop compensation. The latter method requires that you adjust the droop...
It's an ABB 250Amp S4 MCCB. I guess I have to do a research on this breaker's technical specs.
My understanding is if the brochure or technical specs of a breaker specifically mentioned that it can be reversed feed then it's fine. But if not, then don't. I wonder if there's a more technical...
The holes will not be filled by the future cable bolt and lug. My suggestion was to put spacers between the bus bars where these slots are located then bolt them together. But manufacturer did not follow and instead issue an email statement which guarantee the rating.
From another switchgear...
Some copper busbars being used on switchgears are pre-fabricated with slots/holes for ease of installation and interconnection. Example is a 1/4" x 4" square busbar with 3-slots in a row/column. The size of the slots is about 1/2" x 1" (oval shaped). Obviously, these slots reduce the cross...
