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You are overthinking this. 1. Use gear reduction to get the speed down to whatever your generator will withstand. 2. Control the exciter with a DC supply capable of 0 to about 100 Volts. That will be your basic dynamometer for fixed speed.. As you increase the voltage to the exciter field, the...

My experience is mostly with diesel machines running from 120 Volts up to 600 Volts. Sizes ranged from about 6 KVA to 1600 KVA. All were self excited. Some were originally brush excited but had been converted to self excited. When we talk about PMG excitation, we are actually referring to the...

The immediate cause may be hiding the root cause. There was some bad engineering in that supposedly redundant systems were not, in fact, redundant. Lube oil and sealing oil pumps should never have been added to the control battery bank. These pumps should have been on dedicated back up battery...

Losing sync is an issue when systems are running in parallel. With a single machine connected to s load bank there is no synchronism to lose. -------------------- Ohm's law Not just a good idea; It's the LAW!

Engineering failures due to management overriding good engineering and general MBA syndromes are becoming too much a part of too many engineers experience. I don't consider the discussion of a management/MBA conspiracy to cover up a disaster to be a "Conspiracy Theory". It's a fact of life that...

Is this single family residential? Multi family residential? Commercial? Industrial? Utility meter or customer owned meter? What type of loads? What type of peak meter? eg: Instantaneous reading or demand reading? -------------------- Ohm's law Not just a good idea; It's the LAW!

Ah, but this is Boeing. If management said that the door fell off, then the door fell off. (If you want to keep your job.) -------------------- Ohm's law Not just a good idea; It's the LAW!

400 Hz sounds appealing, but higher frequency may mean more poles, not more RPM. Start looking for a suitable reduction gear. At 2:1 reduction you have a wide range of new and used/surplus machines available. A 60 kW Variac to control the loading will be very expensive and may not be available...

With a suction head of 3 meters there will be an absolute pressure of about 3 meters of water column absolute pressure in the pump chamber. That is, about 2/3 of the mass of air in the pump chamber will be trapped when the lower piping floods. You need a vacuum connection to the top of the pump...

These are not bus bars. These are assemblies of parallel flat strips bound into a cable. The flat strips provide some flexibility and reduce skin effect. Code ratings for bus bars are not applicable. Use the manufacturers ampacity ratings. OP is using one flex-bar per phase. No derating is...

A comon iron core may force a balance by transformer action. -------------------- Ohm's law Not just a good idea; It's the LAW!

While these may be in parallel physically, they are not considered in parallel electrically. If you are running one bar per phase, no derating is required. -------------------- Ohm's law Not just a good idea; It's the LAW!

Calculate your voltage drop at the end of the circuit. If the voltage drop exceeds code limits, then you must derate. -------------------- Ohm's law Not just a good idea; It's the LAW!

The thyristors are not matched. While they are within spec, there is enough difference that one hogs the load. At zero current flow, one SCR turns off as is expected. It has been years since I have encountered this and I forget the details, but I have heard anecdotes of hand matching devices to...

Is the meter showing the energization current of a transformer? One phase is often subject to DC offset and that may be almost as much as 2 times the other phase peaks. -------------------- Ohm's law Not just a good idea; It's the LAW!

You probably realize this but the data should be correlated with the viscosity. -------------------- Ohm's law Not just a good idea; It's the LAW!

We had heater failure alarms on our anti condensation heaters. These were on diesel generators about 400 feet from the gulf of Mexico. We used 240Volt rated heaters fed 120 Volts and they were very dependable. When an alarm did go off, I got a phone call and I was on the next flight out to the...

Given a choice between off-line insulation monitoring and anti-condensation heaters (24/7) I would go with the heaters. -------------------- Ohm's law Not just a good idea; It's the LAW!

Is this the Peter Principle at work, or is the Peter Principle failing? Are people now being promoted Past their first level of incompetence? -------------------- Ohm's law Not just a good idea; It's the LAW!

Very true. lps for that. -------------------- Ohm's law Not just a good idea; It's the LAW!