I have been asked to make some generator curves, a Decrement Curve and a Thermal Damage Curve using EasyPower software. The generator data sheets were provided and I have attached them here.
I have found most of the information but am stuck on where to find:
> Field Forcing current as a per...
On an installation at a condominium complex the transformer is a 300kVA, 208/120V secondary. The secondary conductors are 500mcm AL 6 per phase. Transformer FLA is 832A so cable capacity is 1860A more than double transformer FLA. Each conductor has a BUSS Cable Limiter CDB-RV. I could not...
Hello,
I am working with a utility that is doing a 2400V delta to 4160V grounded wye conversion. One item that we are looking at is wildlife protection, mainly from birds. This is an island and there are no squirrels. It is an island so there is salt water so that may be consideration in...
Ok, I hope this is allowed. I am an EE but primarily power circuits and not generators. This is a small alternator for a small diesel motor on a sailboat. It has not been charging the battery so the alternator and voltage regulator were removed.
When I spin the alternator by hand it is very...
Hello, I have reviewed information on VFD's and understand how they function with a load. I either missed it or can't find it but how does a VFD affect motor start? Is the starting curve the same for a motor on a VFD as it is for a standard across the line starter?
Thanks in advance.
Hello,
Long shot but does anyone have any TCC's for Brush XL 70 fuses? These have a Hawker Siddeley name on them but that was an aircraft manufacturer?
I have searched the online info, including manuals but have not found a definitive answer for this question so hoping someone (Zog?) may be able to answer this. The above trip unit is on a ITE K-600 breaker and the unit Ampere Tap is set to 400A. My question is are the CT's tapped to match the...
I have a situation where there is a tie connection between two 480V buses. The tie consists of normally open breakers on each bus and 2 conductors per phase of 500mcm CU GE Vulkene insulated conductors. In my experience, I always thought it was prudent to keep the cable energized by haven't...
For a system that has a generator with a GSU (delta-gnd wye), with a line to ground fault on the line, what trips the generator off line? The generator has relaying for 81O/U, 51V, 32, 27.
I have encountered a transformer configuration I have not seen before and trying to determine the advantages. The distribution system is a 2400V delta system but there are a few 3 phase transformers that are set up as a pass thru. They are a bank of 2400V delta to 2400V gnd wye which creates a...
I am curious to know what people are using for transformer inrush current on time current curves. I have seen anything from 8x FLA to 12x FLA for 6 cycles. The software I use defaults to 8x but that can be changed.
I am working on a project and reviewing some generator datasheets. These are for a pumped storage unit so the generators also operate as motors when pumping. I have not seen pu values this high.
X"d 0.292 pu
X'd 0.35
Xd 0.98
These are saturated values and are these normal for a pumped...
The LC has 2 models. One is called a Series 3 and has a slightly different instantaneous range than a plain LC. Does anyone know when the Series 3 was manufactured?
How many people put in an intentional time delay for a HLT function on a recloser? I am looking at one with settings that have a 0.016 sec (1 cycle) time delay on the HLT. Since this is for personnel safety, why would any time delay be inserted?
Thanks in Advance.
Hello,
A utility I work with is looking at getting WindMil software to perform studies on the system. They recently had the system completely mapped by a company called NISC. Supposedly, this system data can be imported into WindMil for the model.
So my questions to users of WindMil are:
1...
