East Thistle›Overview
Live · 312 streams1 P1
ST
Major Incident · Active P1
T2 Transformer · D2 high-energy arcing
Acetylene 0.4 → 2.3 ppm in 6 hr. Duval shifted Zone D1 → D2. 42Hz drafted a switching plan within 35 min.
Site Health
82/100
▼ 6 today
Live Streams
312active
all online
Load · Real-time
118.4MW
94% of cap
Open Alarms
7active
1 critical
Tickets Open
12WO
3 overdue
Compliance
97% NERC
2 due 7d

42Hz AI Insights

312 streams · 30-day cohort · 2 min ago
PREDICTIVE · 99.4% confidence

T2 — Internal high-energy arcing imminent within 6–18 hr without intervention

Duval Triangle has crossed D1 → D2. Acetylene rose 5.7× in 6h during a 14 MW load step on Feeder 52F23. Cohort match against 412 historical transformer events places T2 in the top 4% of pre-failure signatures.

WINDOW
6–18 h
MODE
OLTC arc
COST
$2.4–6.1M
↳ Trained on 412 cohort events · OEM service bulletins APG-2310 · last 30d telemetry
OPTIMIZATION · Load balancing

Shifting 14 MW from 52F23 to 52F24 reduces T2 thermal stress 38%

Both T1 and T3 are running below 70% of nameplate. Reallocating MERIDIAN-04 demand across feeders rebalances thermal load and buys 6–8 hr of inspection window before any planned outage.

RELIEF
−38%
T1 HEADROOM
32→24%
T3 HEADROOM
31→25%
↳ Power-flow solver · MERIDIAN-04 SLA constraints

Today's Actions

3 overdue · 5 due
Now
52F22 timing & contact resistance test
9 days overdue · NERC PRC-005-6
Now
T2 oil sample + offline DGA
Today · linked to active P1 alarm
Soon
SF₆ density check · 52T3
Due in 3 days · density trending −0.005 bar/d
Soon
DC control power audit · 52T2
Due in 5 days
Plan
Issue PO · 72 kV condenser bushing
Latest order date May 2 · 30-week lead

T2 · Real-time telemetry

312 streams · 2s tick
Winding hot-spot—
Top-oil temp—
Acetylene C₂H₂—
Hydrogen H₂—
Feeder 52F23 · I_a—
Tap position—
Load 39.4 / 42 MVAAmbient 18.4°COil level 96%N₂ 0.42 psi

Reliability · last 90 days

99.987% · 89 reliable · 1 P1 today
Jan 272 amber · 1 criticalToday
SAIDI
2.1 min
SAIFI
0.04
SLA · MERIDIAN-04
met
MTBF · T2
14.2y

Duval Triangle · T2

7-day trail · DGA gas ratio
PDT1T2T3D1D2CH₄ 100%C₂H₄C₂H₂−6dnow · D2
Current sample · 14:08D2 — Arcing
CH₄ 24%
C₂H₄ 46%
C₂H₂ 30%
Trail shows 7-day drift D1→D2 · hover zone for criteria

Site infrastructure

EAST-THISTLE-69 · WECC — Pacific Northwest
Voltage
69 / 34.5 kV
Transformers
3 × 42 MVA (T1, T2, T3)
Tier
Tier 1 · DC utility
Jurisdiction
NERC-WECC
Serves
MERIDIAN-04 Hyperscale Data Center
Coords
47.6094° N, 122.3321° W
Commissioned
2008 — Refurbished 2021