One of the most frequent questions engineers ask before inspecting MV Switchgear, VCB/SF6 Breaker & MV Cable VLF Test Report is: "Which standard should I cite on the certificate, and where do the pass/fail limits come from?" This reference guide maps IEC 62271-100 / IEC 62271-200 / IEEE 400.2 to national regulatory adoptions and provides the complete standard annex tables.
1. National & Regional Standard Equivalence Matrix
| Region / Language | Adopted National Standard & Regulatory Code |
|---|---|
| International / UK (EN) | IEC 62271-100 / IEC 62271-200 / IEEE 400.2 |
| Turkey (TR · Türkçe) | TS EN 62271-100 / TS EN 62271-200 / IEEE 400.2 / TEİAŞ |
| Germany / DACH (DE · Deutsch) | DIN EN 62271-100 / 62271-200 (VDE 0671) / IEEE 400.2 |
| France (FR · Français) | NF C 13-100 / NF C 13-200 / NF EN 62271-100 |
| Spain (ES · Español) | RAT RD 337/2014 / UNE-EN 62271-100 / IEEE 400.2 |
| Italy (IT · Italiano) | CEI 0-16 / CEI EN 62271-100 / CEI 11-17 |
| Gulf / Middle East (AR · العربية) | IEC 62271-100 / IEC 62271-200 / IEEE 400.2 / SASO / DEWA / ADDC |
2. Normative Acceptance Criteria & Mathematical Basis
Evaluates Medium Voltage (3.3 kV - 36 kV) metal-enclosed switchgear cubicles, Vacuum / SF6 circuit breakers, and MV XLPE cables: 100 A DC 4-wire contact resistance & inter-pole spread (<= 50%), opening/closing timing & 3-pole simultaneity (<= 2.0 ms), 5 kV DC pole insulation, and 0.1 Hz VLF tan-delta cable dielectric assessment.
R_contact [uOhm]: Max(R_L1, R_L2, R_L3) <= OEM Limit & Spread <= 50% — 4-wire micro-ohmmeter test at >= 100 A DC across closed breaker poles (NETA ATS §7.6.3)
Delta-t_open [ms]: Max(t_open) - Min(t_open) <= 2.0 ms — 3-pole mechanical opening simultaneity / pole discrepancy (IEC 62271-100)
tan delta (0.1 Hz VLF): <= 4.0 x 10^-3 at Uo (Service-Aged XLPE) — Dielectric loss factor of MV XLPE cable insulation per IEEE 400.2-2013 Table 4
3. Official Standard Reference Tables
IEEE Std 400.2-2013 Table 4: 0.1 Hz VLF Sinusoidal Tan-Delta Condition Assessment for Service-Aged XLPE Cables (IEEE Std 400.2-2013)
| Condition Band | Mean VLF TD at Uo (x 10^-3) | VLF Tip-Up DTD (1.5Uo - 0.5Uo) (x 10^-3) | Recommended Engineering Action |
|---|---|---|---|
| No Action Required | <= 4.0 | <= 5.0 | Cable insulation healthy; return to normal service |
| Further Study Advised | 4.0 to 50 | 5.0 to 80 | Localize moisture/water-treeing in joints or terminations; shorten test cycle |
| Action Required | > 50 | > 80 | Severe dielectric degradation — schedule splice/cable replacement before VLF withstand |