Recent content by tranny

Busbar, Yes that is exactly correct. X1-X2 has a full 100 kVA, and X2-X3 has 1/2, or 5 kVA

Could I get some recommendations as to how this system should be grounded. It appears that IEEE Std 142-1991 figure 10, configuration 2 is what we have, only its single phase instead of three phase. The neutral that comes form the bypass transformer (CVT)is tied to the neutral at the UPS, which...

jbartos, I have suggested that a meter be connected to check the harmonic content. We will see how far the customer would like to go to investigate.

Busbar, according to GE product information GEA-11062B, therecommended way to connect this thransformer for the nameplate kVA is to use x1 and x2. Using x2 and x3 will provide 1/2 nameplate, or 5 kVA. If it was hooked up this way, I can see there would be a problem. Also, the measured...

Yes, that is the purpose. The loads are SCADA, Telephone, DCS System, Power System Stabilizers, RTU's, Fire Alarm, some lighting and receptacles.

Yes, this is all part of the same problem..just different questions. Does anyone know of any history regarding the General Electric "Stabiltron" transformer regarding possible failures of the inductor? Can you explain how the inductor is placed in teh circuit...I'm not quite...

Here is a thought, see what you think. When all this happened, the results were that two power strips were burnt, one tripped, and the Constant Voltage Transformer (inductor part) downstream was on fire. Is it posible that the CVT was shorting internally, and that caused voltage spikes (V=L...

that is the way it is shown to hook it up in the book. The CVT is a General Electric "Stabiltron" the now one that was installed is a SOLA.

The static switch SCR's were fine. They replaced one capacitor in the inverter that they noticed was bulged. I think they are electolytic, big diameter, 3"

There is one "essential panel" that is fed from two possible sources. Normally power comes from the inverter, through a static switch, to the panel. This provides clean ac power to the critical loads. If something happens, such as a fault, or overload, the static switch will sense...

I have a UPS system in which the essential load is normally fed from the ups. I event of an overload or failure of the ups, a static switch will transfer the load to bypass. Bypass consists of a 480 to 120 v single phase constant voltage transformer. The essential bus that is fed from this...

I recently experienced the failure of a 10 kVA constant voltage transformer utilized on the bypass side of a UPS that feeds a critical AC panel in a power plant. Here is what we experienced: At 11:00 AM someone smelled smoke from the SCADA cabinets. The doors were opened and a lot of smoke...

Is there a school in the U.S. that can provide an associates degree in power engineering via distance learning? Or, is there any closely related undergraduate degree programs available via distance learning?