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I was searching for OLTC topics as I'm currently looking at a inverter based project where we didn't show an OLTC but the client insists that they want it. From speaking to a few people at work, and from what wcaseyharman said above, it sounds like the inverters should be able to handle the...

I heard back from a vendor and they confirmed this is possible.

Has anyone ever seen a 345kv GIS underground connection where two sets of conductors are paralleled into the same position? I believe this can be done with AIS equipment based on my review of some substations in NYC but didn't know if it was possible with GIS. I have the question going into...

Yes, just made contact at NKT which I believe took over ABB's cable business. That Bayonne project was the only 345kv project that I could find when I had done some previous searches, it doesn't seem like there is much of a market for cable manufactures to go after.

Anyone ever seen these before? I've only seen up to 275kV systems. What I'm trying to figure out is how far could a 345kv submarine cable go without charging current being a problem. *Edit: The system size is 1200MW

Agreed that 150MW at 0.95pf capability at the POI would limit things. I've seen 4000A bus at 115kv so I'm not sure why we couldn't have 4000A at 34.5kv to parallel into a single MPT. I'm assuming we could get the transformer differential protection to work between a high side breaker and two...

I've been looking into this a bit and it seems like the highest ampacity of readily available equipment you can get for 34.5kv is 3000A. I'm looking at a collector substation for a renewable projects where they are trying to produce 200MW and I'm wondering if there are alternative solutions to...

Thanks for sharing that link, lots of good info in there to read up on! I was able to get some data points for similar sized 345/34.5 utility transformers and the impedance ranged between 9-12.5% and X/R ranged between 40-49

Sorry to start another one of these threads but I've gone through some of the old threads where Cuky2000 has responded and have a few questions. For a 345kv/34.5kv transformer is there a reasonable way to estimate the impedance and X/R? I've been looking at the Cuky2000 table named "Standard...

Thanks for the heads up on induced currents. Yes we will be using to verify they are below the NY state required levels. Some example projects that are in the process of being submitted can be found at the link below. Each submission should have an Appendix 22 for the EMF study...

We are using it to measure the field strength for 34.5kv circuits along roadways for a PV project. We are planning on picking up the magnetic field module with CYMCAP so it sounds like we should be okay with that software package.

Does anyone have a recommendation for EMF study software besides using CYME? We are having a hard time justifying 30k for a software license and looking for some good alternatives. Thanks!

Yes building up sounds feasible and may be our only option as we are also battling with existing vehicle pathways within the substation. I put together a crude diagram of the before and after. There are four generation sources back to back so it looks like there might be more breakers needed...

Hi everyone, I've been tasked with trying to figure out a way to extend an existing air insulated 345kV ring bus in a congested substation. There is not enough room to extend it with air insulated equipment so I'm left wondering if it could be done with exterior GIS equipment. Each end of the...

I'm looking a project where the owner has a switchboard lineup of |Dist-A|CT-Cab-A|Main-A|Tie|Main-B|CT-Cab-B|Dist-B| Dist-A is rated at 3000A while all other bus sections, main breakers, and tie breakers are 4000A. The switchboard already has a load side PV connection tapped into CT-Cab-A...

Hey everyone. I was looking at Pyrotenax MI cables earlier today and it appears that they offer an online voltage drop calculator on their website. It requires a quick signup to use. What I ended up doing was taking their online voltage drop calculator and back calculating the impedance of a...

Thanks everyone for the great responses! Time to get to work!

Hi everyone, first post here. I recently changed jobs where I went from <600V to MV/HV. I reviewed the free resources on this site and was a little overwhelmed on where to start. Does anyone have a good recommendation on what to read first? I'm interested in learning more on relaying...