Medium Voltage TCC

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Mike01

Senior Member
Location
MidWest
Looking at a TCC for a medium voltage system with fuses and relay's for some reason the software only shows the relay curve (GE Induction type relay) up to about 2-seconds the curve ends? If selected the TCC indicates a "Pick up" at the top of the curve but only a short sction, it does not show the complete curve (as for example a fuse curve would) Just curious why the curve would stop around 2-seconds and show a small portion at the top end and not just show the entire curve??
 

jghrist

Senior Member
Usually the TCC is not defined for currents below 1.5 times pickup. If the fault current is below 1.5 times pickup, you should use a lower pickup for reliable operation.
 
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