3
T3

Main Power Transformer T3

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

NormalTier 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
Calisto R9 · T3
Calisto R9 (9-gas online DGA)
Calisto T1 · T3
Calisto T1 — IDD + PD Guard + iO
LTC · T3
MSENSE

Alarm history

Info4d ago
H₂ baseline shift on T3
H₂ moved from 42 → 56 ppm (below warn). Logged for trend review.

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