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RGE trip to full DNO supply

Jordan Wilkes
Hi all, Just after peoples thoughts on the following....


We are currently working on a scheme where our client is looking to install 2No. 2MWe RGE to offset the cost of the DNO supply. As part of a study we are conducting we are looking at how the system would react if the 2No. RGE's were to trip and the 4MWe load would be presented onto the DNO network which is already supplying a small portion of the sites demand.  Our aim is to confirm the main HV breakers do not trip or at what load share threshold they don't. 


We are conducting a load flow and fault level analysis using SKM PTW, but this only allows us to look at steady-state scenarios and not a live peak of supply demand. 

My first thoughts are that the HV breakers should be fine as the site will already be up and running i.e. no large motor loads starting or TX inrush, but just want to get other peoples thoughts on how they might approach the subject. 


Thanks
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  • Former Community Member
    0 Former Community Member
    The most likely issue may be voltage more than thermal. Assuming that you can import 4MW, which the DNO will let you know. If not, you may have to add a demand disconnection scheme.


    But on a more realistic footing. At 4MW you will be connected at the MV level rather than the LV, most likely 11kV, but could be 33kV. At this level the voltage step change for any generator or load is 3% - defined by ENER P28. Meaning that the largest voltage step allowed (when the generator disconnects and the load is seen by the network) cannot exceed 3%.


    Most of that will come down to how strong a connection there is with the distribution network


    Hope that helps
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  • Former Community Member
    0 Former Community Member
    The most likely issue may be voltage more than thermal. Assuming that you can import 4MW, which the DNO will let you know. If not, you may have to add a demand disconnection scheme.


    But on a more realistic footing. At 4MW you will be connected at the MV level rather than the LV, most likely 11kV, but could be 33kV. At this level the voltage step change for any generator or load is 3% - defined by ENER P28. Meaning that the largest voltage step allowed (when the generator disconnects and the load is seen by the network) cannot exceed 3%.


    Most of that will come down to how strong a connection there is with the distribution network


    Hope that helps
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