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sanatan
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Join Date: Aug 2012
Posts: 2

Alternator Burnt

08/23/2012 4:07 AM

dear sir

we have 1250kva diesel alternator its alternator specification is 1034kw,0.85pf,.it is running on full load 850kw continously but suddenly alternetor winding is smoke out,can u please specify the reason?
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PWSlack
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United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
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#1

Re: alternator burnt

08/23/2012 4:16 AM

Possibilities:

  • Too much load current for it given the ambient conditions in which it is operating
  • Shorted turn inside the equipment; insulation breakdown
  • Foreign object embedded in the equipment
  • Reverse power from somewhere else on the distribution network
  • Lack of synchronisation with elsewhere on the distribution network
  • Rainwater ingress
  • Other

Caused by any of these possibilities:

  • Incorrect setting of overcurrent protection device(s)
  • Incorrect operation of prime mover
  • Inadequate maintenance
  • Inadequate control protection device settings
  • Momentary overload
  • Failure to synchronise before connection to the load network
  • Loose cable connections at terminals
  • Other
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silverfox
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Join Date: Nov 2011
Posts: 286
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#2

Re: alternator burnt

08/23/2012 8:10 AM

I agree with Mr Slacks Comments. I would tend to opt for you have simply over run the set. If your pF is out by just a little you quickly exceed the alternator rating. Exactly how would your generator cope with starting a motor where the starting current might be 6 to 8 times. Have you considered the affects of harmonics.
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harry potter
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Join Date: Nov 2008
Location: India
Posts: 333
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#3

Re: Alternator Burnt

08/23/2012 9:43 AM

Smoke represents the maximum probability of winding insulation failure due to weak insulation in winding turns.

Maximum possibility is moisture content, leaky winding, & ultimately failed.

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