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I am having problem on on board ship Generators. When 2 generators are in parallel on busbar, they show same KW, Voltage but one of the Generators shows high Amps. Suspect AVR but failing to understand how.
Just for informationView attachment 2669
Hi sir
Need favour to find the actual cause
1) Generator #1 running at 359 Kw load (800 Kw designed-900rpm) and rpm is varying between 850-870 , Voltage 450 ,Ampere showing 514 where as the frequency remains same.
Generator#2 running parallel at 365 Kw load same model, Rpm is stable at 870, Voltage- 450 ,Ampere is showing 622 ans frequency remains same as Generator #1 as shown in attached picture
2) During parallel, Once the load increases above 500 Kw Generator #1 rpm shown slightly higher fluctuations from 830-870, frequency remains same and no change engine sound, Ampere still higher for Generator #2 & Voltage remain same
Vessel is fitter with NZ61 governor & Yanmar 6N21(A) L-V
This is not immediate effect when Generators are running for long time in parallel then only able to make out
Kindly help me out in solving this issue.
Attaching Main switch board picture showing frequency on both digital metre.
Rohit Singh...
I suggest you check the RPM sensor located on the engine!
Regards, Phil Corso
Rohit Singh...
1) Variation is about 2% which isn't much! But, does problem occur only when the Gensets are paralleled?
Ans- Yes while running alone, it is happening too
2) How old are machines?
Ans- Machines are 12 year old
3) You provided Name-Plate ratings as kW, V, A, RPM... What is power-factor rating shown on Nameplate?
One digital display the below was showing
PF for DG #1 - 0.91
PF for DG #2- 0.76
Regards, Phil Corso
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