Main Power Transformer T2

ABB / GE (TBD) · 42 MVA, 69/34.5 kV Δ-Y · Site east-thistle

AlarmTier 1 criticalLead-time 2–3 yr

Headline signal

Winding hot-spot74.00 °C

Nameplate

MVA42 / 56 / 70 ONAN/ONAF/ONAF

HV69 kV

LV34.5 kV

VectorDyn1

Impedance8.5%

LTC Positions±10 × 0.625%

CoolingONAN/ONAF

Installed2026-09-15

Children

Alarm history

Critical22m ago

C₂H₂ rise on T2 — possible arcing in oil

Acetylene climbed from 0.4 ppm → 2.3 ppm over last 14 days. Duval Triangle zone shifted D1 → D2 (high-energy arcing).

Warning1d ago

Winding hot-spot T2 above 90 °C

Winding RTD #2 touched 92 °C during peak load — fan stage 2 engaged. Cleared on its own.