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Discussion Starter · #1 · (Edited)
Was taking some measurements on a Genset yesterday using my handheld oscilloscope and noticed that its producing a weird sine wave, what is happening here ?





Note the two pictures is from the same output, just different resolutions.


The generator is 1 year old, i am listing the specs below

15 KW

50 Hz

Single phase

Brushless alternator


Thanks in advance guys :)
 

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I seem to recall those handheld scopes being not-so-accurate for anything other than confirming that there's a regular oscillation "of some sort". Could be picking up interference?
 

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I don't know that a sine wave that looked as yours does would bother me.

I have to ask, are you having trouble with connected equipment. Especially sensitive electronic equipments power units.

If not... Well I don't think I would be concerned. It is a manufactured sine wave at best. It is distorted but not terribly.
 

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What size generator?
What did someone besides the local factory rep say (an application engineer with the manufacture)
Do you have a resistive load bank you can put on this unit and take another snapshot?
 

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Discussion Starter · #10 ·
What size generator?
What did someone besides the local factory rep say (an application engineer with the manufacture)
Do you have a resistive load bank you can put on this unit and take another snapshot?
Its a 15Kw 4 pole alternator running at 1500 RPM


I don't have access to a load bank where the genny is installed.

Well its not causing any problems but i am very interested in knowing why its outputting an ugly wave like that, Any idea ?
 

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Its a 15Kw 4 pole alternator running at 1500 RPM


I don't have access to a load bank where the genny is installed.

Well its not causing any problems but i am very interested in knowing why its outputting an ugly wave like that, Any idea ?
I would bet because it is a 15kw generator not an inverter or true sine wave unit.

Just a wild ass guess (WAG)
 

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Bilge Rat
motors and controls.........
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If the regulator has adjustable droop, it could be set too tight. Not enough droop would cause the regulator to ramp too fast and distort the waveform.

If the regulator senses all 3 phases, a waveform like that might be the result of incorrect connections from the stator to the regulator. Like if stator phase A is connected to regulator phase B and so on.

It could also be simply a poor design of the entire generator end.
 

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Discussion Starter · #14 ·
If the regulator has adjustable droop, it could be set too tight. Not enough droop would cause the regulator to ramp too fast and distort the waveform.

If the regulator senses all 3 phases, a waveform like that might be the result of incorrect connections from the stator to the regulator. Like if stator phase A is connected to regulator phase B and so on.

It could also be simply a poor design of the entire generator end.
the genny is single phase, i will give droop a try if it got one
 

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If the regulator has adjustable droop, it could be set too tight. Not enough droop would cause the regulator to ramp too fast and distort the waveform.

If the regulator senses all 3 phases, a waveform like that might be the result of incorrect connections from the stator to the regulator. Like if stator phase A is connected to regulator phase B and so on.

It could also be simply a poor design of the entire generator end.
My bet:thumbsup:
 
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