Nigeria (TCN Grid Code) ride-through requirements
Low-voltage ride-through, High-voltage ride-through, Frequency ride-through for Nigeria. 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 or an envelope the source only partly defines.
What is the low-voltage ride-through envelope for Nigeria (TCN Grid Code)?
The plant must ride through for any voltage that stays on or above this envelope. The envelope holds 0 pu from t = 0 to 150 ms; then ramps linearly from 0 pu at 150 ms to 0.85 pu at 2 s; then 0.85 pu from 2 s, plotted to 20 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 Power Park Modules on the TCN transmission system
| From | To | Voltage | Between the points |
|---|---|---|---|
| 0 | 150 ms | 0 pu | Held flat |
| 150 ms | 2 s | 0 → 0.85 pu | Ramps linearly |
| 2 s | plotted to 20 s | 0.85 pu | Held flat |
The clause this came from
The Grid Code for the Nigeria Electricity Transmission System, NERC, published 01-08-2018 (cover 'Version 03', page footers 'Version 02'), clause 12.6.9(a)-(c) and Figure 1 'Voltage Fault Ride Through requirement for Power Park Modules' (p.63); Vmin from Table 1, subsection 10.1.5 (p.47).
What is the high-voltage ride-through envelope for Nigeria (TCN Grid Code)?
The plant must ride through for any voltage that stays on or below this envelope. The envelope holds 1.2 pu from t = 0 to 2 s; then 1.1 pu from 2 s onward — the last band the envelope defines, with no stated end time.
Covers only the part of the envelope the source defines.
Applies to Power Park Modules on the TCN transmission system
| From | To | Voltage | Between the points |
|---|---|---|---|
| 0 | 2 s | 1.2 pu | Held flat |
| 2 s | no stated end | 1.1 pu | Held flat |
The clause this came from
Nigeria Grid Code (NERC, 01-08-2018), clause 12.6.9(d) and Figure 1 HVRT limb; Vmax from Table 1, subsection 10.1.5.
What is the frequency ride-through envelope for Nigeria (TCN Grid Code)?
The plant must ride through between the upper and lower bands. The upper (over-frequency) band holds 51.75 Hz from t = 0 to 15 s; then 51.5 Hz from 15 s onward — the last band the envelope defines, with no stated end time. The lower (under-frequency) band holds 47.5 Hz from t = 0, plotted to 15 s.
The lower band stops where the published chart stops; the code states no end time.
Applies to Power Park Modules on the TCN transmission system
Upper limit
| From | To | Frequency | Between the points |
|---|---|---|---|
| 0 | 15 s | 51.75 Hz | Held flat |
| 15 s | no stated end | 51.5 Hz | Held flat |
Lower limit
| From | To | Frequency | Between the points |
|---|---|---|---|
| 0 | plotted to 15 s | 47.5 Hz | Held flat |
The clause this came from
Nigeria Grid Code (NERC, 01-08-2018), clause 12.6.5 (corroborated by clause 10.1.4).
Who does Nigeria (TCN Grid Code) bind, and since when?
Power Park Modules on the TCN transmission system. 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 Nigeria (TCN Grid Code). That is a gap on this site, not a statement that Nigeria (TCN Grid Code) 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 Nigeria (TCN Grid Code)
- Does Nigeria (TCN Grid Code) 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 Nigeria (TCN Grid Code) 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 Nigeria (TCN Grid Code) 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 or an envelope the source only partly defines. The clause each curve came from is quoted under it.
- Which events are charted for Nigeria (TCN Grid Code)?
- Nigeria (TCN Grid Code) is charted here with 3 envelopes — low-voltage ride-through, high-voltage ride-through, frequency ride-through (LVRT, HVRT, FRT).
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.
Elsewhere in Africa: Kenya (KNTGC VRPP), Morocco (CRENT), South Africa (NRS 097 / RPP)
Other markets: Saudi Arabia (SAGC), Canada (Alberta AESO), Mexico (Codigo de Red)