Switzerland (Swissgrid CESS minimum requiremen…) — ride-through requirements

The LVRT envelope a grid-scale battery must meet under Switzerland (Swissgrid CESS minimum requiremen…) (Switzerland), digitized breakpoint by breakpoint and checked against the clause it came from.

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. Some values on this page are marked partial: the level is confirmed but at least one duration step could not be read directly from the 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) ride-through 0.001s → 0 pu; 0.2s → 0 pu; 0.53s → 0.21 pu; 0.85s → 0.43 pu; 1.18s → 0.64 pu; 1.5s → 0.85 pu partial

Where these values come from

  • LVRT Swissgrid, 'Technical minimum requirements for the connection of converter-based energy storage systems' (CESS), Version 1.1 of 29 May 2026 - section 3.2.4, Figure 4 (p. 12), read together with section 4.1. Superseded/contrasted source: Swissgrid-VSE 'Transmission Code 2019 (TC-CH)', section 6.5.5, Figure 15, Type 2 curve (Uret2 = 5-15 % Uc, band not a value).

Last checked against the source document on .

Other grid codes in Europe