Forum Discussion
MEXICOWANDERER
Jun 26, 2019Explorer
One must take responsibility for including INRUSH into fundamental calculations for proper sizing load to prime mover.
This is what raised my eyebrows...
using UTILITY power, turn on an incandescent light bulb. Then power-up a power supply connected to NOTHING.
Notice the obvious BLINK of the incandescent light bulb. The greater the potential of the power supply the more profound the blink. This will be noted with full utility potential, 12 AWG wiring and a 30 amp circuit breaker. Discounting this would be foolish. Now, direct connect the power supply to a load. Viola! The blink intensifies.
A funny reality with gasoline engines. Even a tiny reduction in RPM causes a major reduction in power. Chain connect the dots and then an enigma presents itself...
A load presents itself so suddenly the reaction time of the economy idle system coupled to the time need to accelerate the engine to handle the load is violated. This is similar to the need to RAMP the load of motor starting. Only show me a system that would modulate inrush to soften it to the point where the load to the generator allows enough time to compensate...
The 3000IU not only stopped, but it also jerked to a halt. Stunned.
Easily avoidable by first defeating the economy mode and allowing generate full-potential to be presented BEFORE connecting it to "overload". Many ship's generators require paralleling a second generator to feed the start-up of a refrigeration system. For around twenty thousand dollars a three=phase soft start could be incorporated. But many refrigeration systems utilize a three compressor staged system. With multiple generators...neat huh?
This is what raised my eyebrows...
using UTILITY power, turn on an incandescent light bulb. Then power-up a power supply connected to NOTHING.
Notice the obvious BLINK of the incandescent light bulb. The greater the potential of the power supply the more profound the blink. This will be noted with full utility potential, 12 AWG wiring and a 30 amp circuit breaker. Discounting this would be foolish. Now, direct connect the power supply to a load. Viola! The blink intensifies.
A funny reality with gasoline engines. Even a tiny reduction in RPM causes a major reduction in power. Chain connect the dots and then an enigma presents itself...
A load presents itself so suddenly the reaction time of the economy idle system coupled to the time need to accelerate the engine to handle the load is violated. This is similar to the need to RAMP the load of motor starting. Only show me a system that would modulate inrush to soften it to the point where the load to the generator allows enough time to compensate...
The 3000IU not only stopped, but it also jerked to a halt. Stunned.
Easily avoidable by first defeating the economy mode and allowing generate full-potential to be presented BEFORE connecting it to "overload". Many ship's generators require paralleling a second generator to feed the start-up of a refrigeration system. For around twenty thousand dollars a three=phase soft start could be incorporated. But many refrigeration systems utilize a three compressor staged system. With multiple generators...neat huh?
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