Rules and Guidelines
Want to participate in the discussions? Please read our Community Rules and Guidelines. Need some help? Visit Support and Answers.

  • State Not Answered
  • Locked Locked
  • Replies 12 replies
  • Subscribers 31 subscribers
  • Views 4388 views
  • Users 0 members are here
Options
You may also be interested in
This discussion is locked.
You cannot post a reply to this discussion. If you have a question start a new discussion

Diesel Generator Fault Levels

MG
Hello all,


I am looking to specify a temporary mobile diesel generator and as such looking into the disconnection times and the maximum fault current provided by the genset.

I have contacted a provider and got the specification of the alternator in their genset, images below of the fault current graph and the alternator per unit values.


I am looking into understanding what values to use. Am I correct in getting the sustained fault level and for an earth fault to apply the multiplication factor of 2.5 for sustained? I will make sure my disconnection times are less than the sustained maximum duration in order to not trip the generator breaker and loose all of the supply.


Alternator is 50Hz 415V

fc5681c638e7bada3947e466b96400fd-huge-newage-hci534e_1.jpg

3106a5e7994134e881a5487cbbe73194-huge-newage-hci534e.jpg


Parents
  • 0
    Mike and OMS,


    I appreciate your values calculated and the fact that the full load current itself is pretty high, small MCBs will trip. What i am trying to do though is as everyone use Amtech. The Amtech platform has a set value for the generator fault level. As from the alternator manufacturer the fault curve is relatively flat towards the steady state I wanted to use this figure. I am sure this level will trip almost all devices despite that the installation is a 60+ yers old station with at least 4 levels of circuit breakers.


    What i found odd is that the calculated fault levels from the provided impedance per unit values do not really reflect the curve values. This is what I would like to understand.


    Thanks,

    Mike
Reply
  • 0
    Mike and OMS,


    I appreciate your values calculated and the fact that the full load current itself is pretty high, small MCBs will trip. What i am trying to do though is as everyone use Amtech. The Amtech platform has a set value for the generator fault level. As from the alternator manufacturer the fault curve is relatively flat towards the steady state I wanted to use this figure. I am sure this level will trip almost all devices despite that the installation is a 60+ yers old station with at least 4 levels of circuit breakers.


    What i found odd is that the calculated fault levels from the provided impedance per unit values do not really reflect the curve values. This is what I would like to understand.


    Thanks,

    Mike
Children
No Data

Join us to get the best from IET EngX.

Joining EngX lets you personalise your experience so you stay up to date on the topics that interest you, plus you’ll be able to make connections who are looking to collaborate, exchange ideas and more.

Join us Not now

Community Rules & Guidelines