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Nader
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Join Date: Nov 2015
Posts: 4

Diesel Generator

11/13/2015 2:36 AM

Hi,

We have three diesel generators working in parallel A,B,C

The Generator A is able to synchronise with B and C but it did not take the load (P=0 KW)

and if I increase the speed it will trip by over speed.

NB: The load sharing system is well working before, and the load was shared between 3 generators.

Could you please help me to reolve this issue

Thanks
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Legolaz
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Join Date: Sep 2015
Posts: 482
#1

Re: Diesel Generator

11/13/2015 4:36 AM

Yes, why not generator sets can not be connected in series?

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SHOCKHISCAN
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#6
In reply to #1

Re: Diesel Generator

11/13/2015 7:24 PM

Because doing so would most likely let the smoke out of the generators as well as some or everything operating and connected to the downstream bus.

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Legolaz
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#7
In reply to #6

Re: Diesel Generator

11/15/2015 1:19 AM

I'd intentionally throw that to the guy, so that it will activate his thinking.

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spades
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#2

Re: Diesel Generator

11/13/2015 4:55 AM

Is the circuit breaker for genset A closed?

Have you checked your droop control setpoints?

Have you checked the field exciter circuitry, is A operating on reverse power?

Have you tried raising the frequency of A slightly above that of B & C? - It may not come in until you do that.

Have you checked governor setpoints?

Typically for parallel gensets, increasing throttle settings should not increase speed, but should increase its load share - so - if you are, as you say, getting an output from the genset, but it is not going online, and the speed increases, then check the items that I have listed above. It may be a controller failure.
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Nader
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Posts: 4
#8
In reply to #2

Re: Diesel Generator

11/15/2015 6:11 AM

Hi,

Thank you to your answer.

- The circuit breaker for genset A Closed

- The exciter checked and we have 400V 50HZ

- Yes I tried to raise the frequency of A till I reach 50HZ

I will replace the controller till I receive the software from vendor
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Rixter
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#3

Re: Diesel Generator

11/13/2015 5:55 AM

I think that A is not really connected and that the breaker is tripping out as soon as you try to connect it. If it were connected, increasing the throttle would increase KW and not increase speed.
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RAMConsult
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#4

Re: Diesel Generator

11/13/2015 9:25 AM

Was this unit being returned to service after some sort of maintenance? If so then you need to check the wiring from the instrumentation transformers all the way back to the controller, plus any interconnecting wiring between the units. Crosswired droop compensation may cause a similar event.

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Nader
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#9
In reply to #4

Re: Diesel Generator

11/15/2015 6:16 AM

The engine was running and it stop by emergency shut down (gas detection)
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RAMConsult
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#10

Re: Diesel Generator

11/15/2015 11:30 AM

Not quite sure why OPs responses in #8 & 9 were marked OT since they provide feedback and clues as to what's going on. If the unit trips on some sort of gas detection protection then you must investigate the reason for the trip before proceeding, especially if this unit is on a platform or in a classified area.

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Nader
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#11
In reply to #10

Re: Diesel Generator

11/15/2015 12:21 PM

Investigation done and the platform started again but we still have a problem to start the third standby generator
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Munster
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#12

Re: Diesel Generator

11/16/2015 7:06 PM

Manuals available? Call to the manufacturer, or distributor? See #5 for reference.
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adreasler
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#13

Re: Diesel Generator

11/17/2015 9:44 AM

Previous state:

Load Sharing System was working, load was shared between generators A, B, and C.

Current state:

Generator A running, but not sharing load.

Suggestion:

  1. Confirm that Generator A is still properly connected to Load Sharing System.
  2. Inspect the Load Sharing System, that is the likely 'common point' of the problem.
  3. Go into the internet and look up a skill called 'Toubleshooting.'
    1. Learn it.
    2. Live it.
    3. Love it.
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Users who posted comments:

adreasler (1); Legolaz (2); lyn (1); Munster (1); Nader (3); RAMConsult (2); Rixter (1); SHOCKHISCAN (1); spades (1)

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