Power system strength is very important for system planning and protection design. There is one metric "SCR or short circuit ratio" generally mentioned to define the system strength. I have confusion about the definition of this index. Some texts define it as the ratio between short-circuit MVA and rated MVA and some define it in reference to the inverter based resources as the ratio between short-circuit MVA and rated MW of inverter based power source. Few references are attached.
Kindly clarify.
SCR may have slightly different definitions, but the basic concept is almost the same; in particular for LLC-HVDC the effective short circuit ratio should be considered, since it includes the effect of the reactive power compensation. You may find careful and detailed discussions in several CIGRE Brochures produced by SC's B4 and C4.
the short circuit ratio determine internal impedance for each electrical equipment as %UK and how much this is lower level of short circuit is more and when connect to network it can be receive inrush current in start up and when disconnect from network send voltage more toward network in this electrical equipment need used higher range of switch and fuse cable high pot current curve saturation for current transformer and potential transformer over current and protection relay take more attention for set the trip relay and need more survey and connections need mor attention when this equipment failed because SCR is so low all user near it coule be trip or damage.
thanks for attention
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