Recent content by burnt2x

What I meant when I asked about how big your mill was is the tons per hour of coconut shells it processes. Google Bond's formula on milling power draw.

I suggest you gather more data on the hammer mill than looking at your diesel drive. How big is your hammer mill?

Good point, @byrdj. a star for you. But grsnting that the question was really about a tripped generator main breaker and the turbine still turning at synch speed, I would still trip the turbine or it will go to a runaway condition after losing its load. What pete said, most new generators have...

When your desired application goes beyond what your equipment was designed to do, you're like throwing away whatever warranty left on the said equipment. Why not buy a 240/480V transformer or a genset with dual-voltage output (as recommended by others)?

What you wanted to coordinate will determine how you set your Inst, STPU, and LTPU. If you wanted to defeat the Instantaneous trip and allow the branch breaker to pickup first, you set your main breaker Inst pickup just above the real fault level. As long as the Inst trip setting is lower than...

Honestly, you don't need to coordinate your utility fuse with your main breaker: they are serving the same load. If the main breaker trips ahead of your fuse, you lose your trafo in the same way with a utility fuse break. I agree with others on adjusting the main breaker trip settings to the...

And one needs to shout to show his knowledge? Buy a 100hp pump instead.

Google is your friend. Use it. Use "OHC" or "OHGW" as keywords.

If you have it, then take it off your device. Then try to investigate; no. of turns, size of wire, core dimensions, etc.

I don't believe your blower will labor too much operating at a cooler temperature. IIRC, the rule of thumb is for every 4 deg C of temperature decrease there will be a 1% lower energy consumption due to a denser air being handled. Also, I made a quick calc on your motor data: kW = 53, Voltage =...

The only way for a roots blower to draw more current from its drive motor is for the blower discs rubbing, constriction of either discharge or suction ports or a failed pressure relief valve. Any condition that will attempt to control the air flow will result into the equipment drive drawing...

Any idea how big these blowers are? CFM?

Are you having inrush problems?

A PI below 1.0 indicates bad insulation, IMO. Please isolate motor from the supply line and see if the motor (only) PI is "good".

Ahh! You were just fed with data that came from previous computations! The transformer you are presenting is a 20MVA transformer. Whatever the losses, depends on how much your load is as well as the no-load (core loss) of the transformer.