NERC PRC-024-4 (no-trip) — ride-through requirements

The LVRT, HVRT envelopes a grid-scale battery must meet under NERC PRC-024-4 (no-trip) (US), digitized breakpoint by breakpoint and checked against the clause it came from. This is a protection-setting no-trip boundary, not a ride-through performance duty.

By Sergey Syrvachev — Director of Product Engineering, grid-scale BESS · 10+ GWh delivered

Part of: the grid-code ride-through chart — compare this against 63 other standards in 42 countries.

What this is, and is not. A reading aid compiled from the clause cited below — not a compliance document. The primary text governs. Every value here was read from a current primary source.

Breakpoints

Times are seconds from the start of the disturbance. Voltage is per-unit of nominal; frequency in hertz. An LVRT curve is a lower boundary (stay connected while voltage is on or above it), an HVRT curve an upper boundary, and FRT gives the band between its High and Low boundaries.

Event Duty Breakpoints Status
low-voltage ride-through (LVRT) no-trip 0.001s → 0 pu; 0.15s → 0 pu; 0.151s → 0.45 pu; 0.3s → 0.45 pu; 0.301s → 0.65 pu; 2s → 0.65 pu; 2.001s → 0.75 pu; 3s → 0.75 pu; 3.001s → 0.9 pu; 4s → 0.9 pu verified
high-voltage ride-through (HVRT) no-trip 0.001s → 1.2 pu; 0.2s → 1.2 pu; 0.201s → 1.175 pu; 0.5s → 1.175 pu; 0.501s → 1.15 pu; 1s → 1.15 pu; 1.001s → 1.1 pu verified

Where these values come from

  • LVRT NERC PRC-024-4, Attachment 2 'Voltage No-Trip Boundaries – Eastern, Western, and ERCOT Interconnections', Table 5 'Voltage Boundary Data Points' (p.16) and Figure 5 callout. Identical table appears in PRC-024-3 (p.10, 'Voltage Boundary Data Points'), so the correction holds under either edition.
  • HVRT NERC PRC-024-4 Section A.1 Title, A.4 Applicability 4.2.1–4.2.3, Requirement R2, and Attachment 2 Table 5 (p.16).

Last checked against the source document on .

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