WN-KT9D — PdM

Overall Risk Score

0

● HIGH

Risk Score / 100 · evaluated 2026-06-03 14:10

Score Breakdown & Weighted Formula

35% weight Rule-Based · IEC 100

25% weight DGA Diagnostics 55

20% weight Statistical Z-Score 100

20% weight Isolation Forest 33

Rule-Based · IEC 100 × 0.35 = 35.0

DGA Diagnostics 55 × 0.25 = 13.8

Statistical Z-Score 100 × 0.20 = 20.0

Isolation Forest 33 × 0.20 = 6.7

Score = Rule×0.35 + DGA×0.25 + Stat×0.20 + IF×0.20
= 75.4 → HIGH

Action Required

🟠 HIGH

Plan maintenance within one week

⏱ within 7 day(s)

NORMAL (0–20)routine

LOW (20–40)schedule

MEDIUM (40–60)inspect ↑

HIGH (60–80)repair 7d

CRITICAL (80+)stop now!

Rule Alerts

3

CRITICAL alerts

0

WARNING alerts

DGA Diagnostics

T2

fault type(s)

55

DGA severity

ML & Statistical

100

Z-Score component

33

Isolation Forest

Overall Assessment

🟠

HIGH

act within 7d

Open Alerts (4)

Detected	Method	Severity	Message
05-02 05:00	rule	CRITICAL	HYDROGEN-H2 PHASE A (PPM): 1500.0 — Partial discharge in oil
05-02 05:00	rule	CRITICAL	METHANE-CH4 PHASE A (PPM): 700.0 — Thermal fault above ~300 C
05-02 05:00	rule	CRITICAL	ETHYLENE-C2H4 PHASE A (PPM): 520.0 — Severe overheating above ~700 C
05-02 05:00	dga	MEDIUM	DGA fault T2: Thermal fault 300-700 C

IEC Rules Catalog (reference)

Parameter	Unit	Warn	Critical	Standard
HYDROGEN-H2	ppm	100	700	IEC 60599
METHANE-CH4	ppm	120	400	IEC 60599
ETHYLENE-C2H4	ppm	50	200	IEC 60599
ACETYLENE-C2H2	ppm	3	35	IEC 60599
CARBON MONOXIDE-CO	ppm	350	900	IEEE C57.104
MOISTURE-H2O	ppm	10	30	IEC 60422
TOP OIL TEMP	°C	85	105	IEC 60076-7
WINDING TEMP	°C	98	120	IEC 60076-2
AMBIENT TEMP	°C	40	50	IEC 60076-2
OLTC OIL TEMP	°C	80	100	IEC 60214-1
BOTTOM OIL TEMP	°C	75	95	IEC 60076-7