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--- declaration:fault_current_contribution [2019/03/18 21:42]
admin
+++ declaration:fault_current_contribution [2024/12/02 21:46] (current)
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 ====== Fault Current Contribution ======
 Sinexcel has received inquiries as to the relationship of fault current contributed and kilo-Amperes Interrupting Capacity (kAIC) ratings.
-With regard to the fault current contribution of Sinexcel inverters, the contribution from the microinverters is far less than the kAIC rating of any circuit breaker.
+With regard to the fault current contribution of Sinexcel inverters, the contribution from the inverters is far less than the kAIC rating of any circuit breaker.
 Only circuit breakers, fuses, and some load-rated switches have AIC ratings. As a current source, a utility interactive inverter does not, by itself, require an AIC rating.
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   * Secondly, will it interrupt the current supplied by the Distributed Generator (DG) when the short is located on the grid side? Is it possible for the DG to deliver more current than the circuit breaker can interrupt?
-In [[https://digital.library.unt.edu/ark:/67531/metadc932983/m2/1/high_res_d/971441.pdf|//Understanding Fault Characteristics of Inverter-Based Distributed Energy Resources//]], a National Renewable Energy Laboratory study published in January 2010, Keller & Kroposki address fault current contributions of Distributed Energy Resources (DERs) and inverters in particular:
+In [[https://digital.library.unt.edu/ark:/67531/metadc932983/m2/1/high_res_d/971441.pdf|Understanding Fault Characteristics of Inverter-Based Distributed Energy Resources]], a National Renewable Energy Laboratory study published in January 2010, Keller & Kroposki address fault current contributions of Distributed Energy Resources (DERs) and inverters in particular:
 “Inverters do not dynamically behave the same as synchronous or induction machines. Inverters do not have a rotating mass component; therefore, they do not develop inertia to carry fault current based on an electro-magnetic characteristic. Power electronic inverters have a much faster decaying envelope for fault currents because the devices lack predominately inductive characteristics that are associated with rotating machines. These characteristics dictate the time constants involved with the circuit. Inverters also can be controlled in a manner unlike rotating machines because they can be programmed to vary the length of time it takes them to respond to fault conditions. This will also impact the fault current characteristics of the inverter.”