New Zealand South Island (EIPC cl 8.25A) ride-through requirements
Low-voltage ride-through for New Zealand. Every breakpoint below is read from the code itself, and where a point was taken off a published figure rather than stated in the clause, the section under that chart says so — an envelope that stops where its published chart stops.
What is the low-voltage ride-through envelope for New Zealand South Island (EIPC cl 8.25A)?
The plant must ride through for any voltage that stays on or above this envelope. The envelope holds 0 pu from t = 0 to 140 ms; then ramps linearly from 0.14 pu at 140 ms to 0.35 pu at 500 ms; then 0.76 pu from 500 ms to 3 s; then 0.9 pu from 3 s, plotted to 6 s.
The clause states this boundary as a line; intermediate points are interpolated between its stated vertices. The envelope stops where the published chart stops; the code states no end time.
Applies to Grid-connected generating stations, South Island (Fig 8.2)
| From | To | Voltage | Between the points |
|---|---|---|---|
| 0 | 140 ms | 0 pu | Held flat |
| 140 ms | 500 ms | 0.14 → 0.35 pu | Ramps linearly |
| 500 ms | 3 s | 0.76 pu | Held flat |
| 3 s | plotted to 6 s | 0.9 pu | Held flat |
The clause this came from
Electricity Industry Participation Code 2010, Part 8, cl 8.25A(1) and (6), Figure 8.2 — verified in the 1 May 2025 consolidation; clause unchanged at 1 July 2026. The code defines a linear recovery ramp; the vertices are read from the clause and the chart draws the segment between them.
Who does New Zealand South Island (EIPC cl 8.25A) bind, and since when?
Grid-connected generating stations, South Island (Fig 8.2). No date of effect is published here — grid codes are reissued, so check the current issue before relying on it.
These figures are a reading aid, not legal advice. Grid codes are reissued: verify against the current edition before you design to them.
Digitised operating parameters beyond ride-through — droop, reactive capability, operating ranges — are published for 36 of the 66 codes in this atlas, not yet for New Zealand South Island (EIPC cl 8.25A). That is a gap on this site, not a statement that New Zealand South Island (EIPC cl 8.25A) sets none — the atlas hub marks the codes that carry them.
Curve data last checked against the code on — 66 standards, 130 envelopes, published by bess.engineer under CC BY 4.0.
Questions this page answers about New Zealand South Island (EIPC cl 8.25A)
- Does New Zealand South Island (EIPC cl 8.25A) require ride-through, or only that the plant does not trip?
- Ride-through. Every envelope on this page is a performance duty the plant must meet, not a protection-setting no-trip boundary — they are different obligations. That is what these curves are; they are not everything New Zealand South Island (EIPC cl 8.25A) contains. The requirement sentence under each chart says which side of the curve is the compliant one.
- Are the numbers on this page taken from New Zealand South Island (EIPC cl 8.25A) itself?
- Every breakpoint is read from the code, and where a point was taken off a published figure rather than stated in the clause, the section under that chart says so — on this page that includes an envelope that stops where its published chart stops. The clause each curve came from is quoted under it.
- Which events are charted for New Zealand South Island (EIPC cl 8.25A)?
- New Zealand South Island (EIPC cl 8.25A) is charted here with 1 envelope — low-voltage ride-through (LVRT). No high-voltage or frequency envelope is charted here — check New Zealand South Island (EIPC cl 8.25A) itself before concluding it sets none.
Ride-through, in context.
An envelope is a compliance boundary; understanding why it exists is a different question. The ride-through and grid-forming entries cover the engineering, and the Engineering Foundations course builds it from the physics up.
Also for New Zealand: New Zealand (EIPC cl 8.25A), New Zealand North Island (EIPC cl 8.19(1)), New Zealand North Island (EIPC cl 8.25A)
Elsewhere in Asia-Pacific: Philippines PV (PGC 2016 Fig 4.4), Philippines VRE (PGC 2016 Tables 4.1 & 4.3), Philippines Wind (PGC 2016 Fig 4.2), and 9 more