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I think I already know the answer to this, but I will ask anyway. A substation with a 10MVA 138KV/4160V Delta Wye transformer feeds our facility. The power company is planning to install a neutral grounding resistor during our next shutdown. Here is where my question comes in. The...

We only have protection on the feeder to the first transformer and on the secondary of the second transformer. This is temporary.

No switch, they are connected directly togethor.

The transformers are connected directly togethor. We needed to get from 2400 to 4160 and this was our only option for a one week delivery.

I have never run into this scenario before so I thought I would double check: I have a 2400V service that feeds a Delta Delta 2000KVA 2400V/12470V step up transformer that is connected in series directly to a Delta Wye 1500KVA 12470/4160V transformer (This was done this way due to transformer...

The voltage is 4160V.

Here is the scenario: There is a substation outside our gas facility (approximately 800'). We are running a set of conductors (6 -750MCM per phase underground) from a dedicated substation breaker to the main switchgear at the gas plant (MLO). This is the only connection to the substation from...

DickDV: I am not sure why you need to size the VFD for no less than 150% of the motor FLA? I have used 3000HP drives to start 6000HP reciprocating compressors. Obviously you can't load the compressors, but for motor starting the drive rated current actually can be ~40 - 50% of the FLA of the...

In the last year I have been involved with the install of 4 4000HP Siemens air cooled drives and I am currently installing 4 more. Siemens recommends about 15Tons of HVAC for every 1000HP if you are exhausting directly into the building. We chose to actually build ducts into the building for the...