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  1. proprot

    Adaptive Setting LV Circuit Breakers for IBR Microgrids

    Hove you considered something like Solkor protection ?
  2. proprot

    Fault current capability of DFIG generators

    Was also looking into this. It would seem as if the information is difficult to come by outside of manufacturer circles. I am mainly looking at Type 4 turbines. On these it apperas as if the reactive fault current injection is based on a formua where a factor is used in congunction with the...
  3. proprot

    Fan Calculation

    Thanks So essentially the fan size can be reduced dramatically. I looked at a the link you posted and plotted the 0.115 m/s on the curve it gives me a static pressure rating what would I use this for. The fan is venting into the open atmosphere essentially extracting the gas contents of the...
  4. proprot

    Fan Calculation

    Hi The application is for a battery room and the 1.9 comes from a calculation used to determined the changes per hour required in the room to keep the H2 (Hydrogen) concentration to below 0.8% this is when the battery's are gassing. So on correcting my previous error the 43.71m^3 x (1.9/3600)...
  5. proprot

    Fan Calculation

    Hi I am trying to calculate if the fan I have installed at a particular site is to large. The dimensions of the room are 4.7m x 3.0m x 3.1m that gives me a total volume of 43.71m^3 the inlet size of a single louvre vent into the room is 0.500m x 0.400m that gives me an inlet area of 0.2m^2 the...
  6. proprot

    Directional Overcurrent and Earth Fault Protection

    Hi I have a one or two questions that I would like some clarity on regarding protection using directional overcurrent and earth fault protection. 1. When using a 90°-30° characteristic (30° RCA) why is it recommended that the relay is used for the protection of plain feeders with the zero...

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