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LED inrush current and generator set

Julien Leblanc
Hello,


I'm currently working on a sport field application where i need to power some LED reflectors (30 kW total).

I will also use a generator set, in case the network fails.


The inrush current of the reflectors is 3 times higher than their rated current, but the duration is only 0.2ms.


Could anybody tell me if i should take into account the inrush current when I choose the generator set power (that is, to oversize the generator)?

Or i should ignore the inrush current and set the power of the generator a bit higher than the total power of the reflectors?

I'm not talking about the circuit breakers of generator's outputs. Let's say one can choose them so that they don't trip.

If those breakers don't trip, is it possible that anything else happen to the generator set, because of the inrush current?


I've been searching through the specifications of many generator sets, but i cannot find any data on this specific problem (short overload).






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  • 0
    Regardless of inrush, no normal genset will appreciate steps in the load of more than about 30-50 % of the nominal rating - this depends a bit on the design, but it is certainly possible to stall a typical genset by letting it stabilise at, or near no load, with the fuel rate into the engine very low,  and then slamming on the full load.

    Gensets built to supply very impulsive nodes tend to be induction units, (so no brushes) and also to have deliberately heavy flywheels on the propshaft. This in turn makes initial turn on and getting up to the right speed take longer however - there is no 'free lunch'.

    Bringing the load on in stages, so the engine controls have time to open the throttle and get the speed up between steps, is the only way to get from nothing to full load without problems.

    If you can divide your load into 3 or 4 banks and space them by a second (time delay relays and contactors) it will go a long way to easing the problem.
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  • 0
    Regardless of inrush, no normal genset will appreciate steps in the load of more than about 30-50 % of the nominal rating - this depends a bit on the design, but it is certainly possible to stall a typical genset by letting it stabilise at, or near no load, with the fuel rate into the engine very low,  and then slamming on the full load.

    Gensets built to supply very impulsive nodes tend to be induction units, (so no brushes) and also to have deliberately heavy flywheels on the propshaft. This in turn makes initial turn on and getting up to the right speed take longer however - there is no 'free lunch'.

    Bringing the load on in stages, so the engine controls have time to open the throttle and get the speed up between steps, is the only way to get from nothing to full load without problems.

    If you can divide your load into 3 or 4 banks and space them by a second (time delay relays and contactors) it will go a long way to easing the problem.
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