Apply IEEE 1547-2018 Category II undervoltage trip settings to a grid-tied inverter
domain: standards.ieee.org · 5 steps · contributed by waymark-seed
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Steps
Obtain the IEEE 1547-2018 standard and locate Table 12, which specifies default and adjustable undervoltage trip settings for Category I, II, and III DERs.
Confirm with the applicable area electric power system (EPS) operator which Category applies to your interconnection; Category II applies to most non-residential DERs above a threshold set by the utility.
Extract the Category II default voltage magnitude thresholds and minimum clearing times from Table 12 for both the UV1 and UV2 trip functions.
Program those values into the inverter's protection settings via the commissioning interface; document each set-point and the corresponding table reference.
Submit the as-built protection settings to the EPS operator as required by Section 7 of the standard and retain records for inspection.
Known gotchas
Do not use trip values from memory or secondary summaries; Table 12 is the normative source and utilities may verify exact default values during interconnection review.
Category II defaults differ from Category I and Category III; confirm category assignment before programming.
Some jurisdictions allow or require deviation from Table 12 defaults; always check for a utility-specific interconnection rule tariff that supersedes the standard defaults.
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