Diesel Generators

Archive for October, 2009

]am way out of school.]
a train weighs 120,000 pounds
it can travel, using diesel fuel, 16 kilometers
in one hour

if it switches power, it can travel 4 kilometers
in one hour using elect generators

if it again switches power, to wind power,
it can travel 2 kilometers per hour.

if the engineer wishes to incorporate
all 3 means of propulsion, what speed or
distance will he be able to reach?

offer answer and foruma.

I don’t remember the formulas to resolve this the proper way, but if you can ignore some conversion loose, and despite the fact that the wind power will vary as the train goes faster (if the wind generator is on the train).
I have to say that the energy of the three systems together will be the sum of all the energy generated, having more energy you can conver it to more force or more speed depending on what you need.
In other words, as the amount of joules of energy will be the sum of all of them, I assume that the speed will also be and the answer should be:

16km/h + 4km/h + 2km/h = 22km/h

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When the household generator quicks on in an outage, the lights are brighter, the floor fans work better, etc…. When we are using the public utilities current, the lights are dim, the fans are slow and every time our wellpump quicks on, the lights flicker and dim more. AND, when we have the generator on automatic, it turns on every time the wellpump comes on and then shuts off shortly after the wellpump stops. We have had the current checked by public utilities here and they said the volts coming into the house are fine but the amps which should be at 125 is only 17! The utility company (we live on an island in the Caribbean) says there must be a problem both at the pole AND in the house but how can this be when we have no problems in the house when the generator is on? Also, will running our appliances and electronics with such low amp availability damage them?

your power from the mains enters your house from a down lead connected to power from the street. The down lead is then connected to a power meter, then from the meter via a feeder line to the main circuit breaker panel.

Your generator is most likely connected via its own feeder and switch gear to either several circuits or the entire circuit breaker Panel.

This makes the circuit breaker panel or selected individual circuits on it the common point between the two systems.

So the problem lies either from the pole/transformer or on your house to equipment on your home which includes the down lead, Meter, Meter box/socket, or feeder line to the main CB panel.

I cannot completely rule out your circuit breaker panel or generator switch gear yet because I don’t know details of how your have the gen set wired into the system. So depending on where the switch gear is located you could have an issue with the mains power connection there.

Now in terms of amps your main can provide 125A but its drawing only 17. Reading the amperage by itself doesn’t mean there is problem, rather you aren’t using enough power.

What you do need to do is measure the voltage while items are running and look for a voltage drop.

At the pole you have 125V while you have a number of devices connected which result in a current draw of 17A. Ohms law E = I * R
will tell us that you hav roughly 7.5 Ohms of resistance connected to the mains. In a perfect system all of the devices are connected in parallel with zero series resistance. This allows each device to get full mains voltage. What you don’t know is if that 7.5 ohms is just from your equipment or if it includes any series resistance from a loose or bad connection. Series resistance will cause a voltage drop , leaving less voltage available for your devices to operate.

Motors want to draw the same amount of power P = E * I so if they see less voltage and will run at a lower speed and draw more current.. The higher current flow will cause more voltage drop across the series resistance and leave less voltage for the lights which will look dim.

To find the voltage drop try measuring the voltage of a high amp motor while its running and when its off. Compare the two and see what the difference is If you have significant difference more than 5V you have a voltage drop. Work your way back through the system measuring voltages until you possible see the voltage return to something much closer to the 125V no load voltage.

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Aside from Northern Lights. I’m already aware.

Yanmar, Onan, Yamaha, Honda, Cummins, Caterpillar, Farymann Marine, Isuzu, Detroit Diesel, Deutz, John Deere, Lister, Mitsubishi, Perkins, Kubota, Volvo, Fiat, Lincoln, Susuki, Kawasaki etc.

And ten thousand Chinese things that apparently you can even get a run named after yourself!

Thats of the top of my head - there are hundreds I have never heard of or just can’t remember right now….

Good luck. Stick to good locally serviced brands for any warranty claims and you can’t go wrong.

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