Engineering software for protection and transformer reliability

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Sample evidence pack

Transformer condition review, packaged for human decision

This specimen shows the evidence pack GridAPM produces — source-linked evidence, agent rationale, engineer review, and a clear next action — laid out page by page, exactly as a reviewer reads it.

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Specimen — synthetic data

This is a synthetic specimen. Every value on this page is fabricated to demonstrate report structure and review flow — not a measurement from a real asset, and not diagnostic advice.

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EP-TX47-2026-07 TX-47 · 230/69 kV · 60 MVA · ONAF GridAPM Workbench export — synthetic specimen

EP-TX47-2026-07 01 / 06

Asset overview & health index

TX-47 is a 230/69 kV, 60 MVA transmission supply transformer commissioned in 1998. Its health index reads 82/100 — in the Good band — but two drivers pull it down: an active dissolved-gas trend and a warm B-phase connection. The agent drafts targeted follow-up instead of routine deferral.

Health index with score drivers Synthetic specimen data — illustrative values, not measurements from a customer fleet.
Health index with score drivers Semicircular health-index gauge reading 82 of 100, in the Good band. Bands: Poor 0–40, Fair 40–70, Good 70–100. Score drivers: DGA −8, Thermal −6, Bushings −3, OLTC −1; Health index 82.
82 / 100
Good
Poor 0–40 Fair 40–70 Good 70–100

Score drivers

DGA
−8
Thermal
−6
Bushings
−3
OLTC
−1
Health index
82

AI draft — awaiting engineer review

EP-TX47-2026-07 02 / 06

Dissolved gas analysis

Hydrogen crossed its 80 ppm watch level after the gassing event and now reads 148 ppm; methane and ethylene climb in step while acetylene stays low at 11 ppm. The ratios plot in Duval zone T2 — a thermal fault between 300 °C and 700 °C — consistent with a localized hot-metal source rather than arcing.

Dissolved gas trend — 13 monthly samples Synthetic specimen data — illustrative values, not measurements from a customer fleet.
  • H2
  • CH4
  • C2H4
  • C2H2
Dissolved gas trend — 13 monthly samples Line chart of dissolved gas concentrations in ppm over 13 oil samples. H2 ends at 148 ppm, CH4 ends at 74 ppm, C2H4 ends at 58 ppm, C2H2 ends at 11 ppm. H2 watch level: 80 ppm. Gassing event marked at sample 9. H2 watch level Gassing event
H2 (latest)
148 ppm At risk
C2H2 (latest)
11 ppm Watch
Duval triangle 1 — sample position Synthetic specimen data — illustrative values, not measurements from a customer fleet.
Duval triangle 1 — sample position Duval triangle 1: ternary plot of relative CH4, C2H4 and C2H2 percentages with fault zones PD (Partial discharges), T1 (Thermal fault below 300 °C), T2 (Thermal fault 300–700 °C), T3 (Thermal fault above 700 °C), DT (Mixed thermal and electrical fault), D2 (High-energy discharges), D1 (Low-energy discharges). Plotted sample: CH4 62 %, C2H4 35 %, C2H2 3 %, falling in zone T2 (Thermal fault 300–700 °C). PD T1 T2 T3 DT D2 D1 % CH4 % C2H4 % C2H2 Sample
PD
Partial discharges
T1
Thermal fault below 300 °C
T2
Thermal fault 300–700 °C
T3
Thermal fault above 700 °C
DT
Mixed thermal and electrical fault
D2
High-energy discharges
D1
Low-energy discharges
CH4
62 %
C2H4
35 %
C2H2
3 %
Indicated zone
T2 Watch

AI draft — awaiting engineer review

EP-TX47-2026-07 03 / 06

Partial discharge

PRPD shows clusters on both sine flanks with a 460 pC peak concentrated between 30° and 110° — a pattern the agent flags as a possible bushing-PD counter-hypothesis to the thermal story. The pack keeps both hypotheses open and routes a PD-monitor action into the work package.

Phase-resolved PD pattern Synthetic specimen data — illustrative values, not measurements from a customer fleet.
  • AC reference
  • Amplitude (pC)
Phase-resolved PD pattern Scatter plot of 170 partial-discharge pulses across one 360-degree power cycle, plotted against a sine voltage reference. Pulses cluster on the rising flanks of both half-cycles, the signature of an internal discharge source. Amplitude scale: ±500 pC.
Peak amplitude
460 pC Watch
Phase concentration
30°–110°

AI draft — awaiting engineer review

EP-TX47-2026-07 04 / 06

Frequency response (SFRA)

The measured sweep tracks the 2019 baseline below 2 kHz (correlation 0.99) but deviates in the 10–200 kHz band, where correlation drops to 0.87. The reviewer schedules a bushing-configuration check before the next outage rather than an immediate winding-movement call.

SFRA — baseline vs measured Synthetic specimen data — illustrative values, not measurements from a customer fleet.
  • Baseline (2019)
  • Measured
SFRA — baseline vs measured Overlaid SFRA magnitude curves (Baseline (2019) and Measured) from 20 Hz to 2 MHz. The measured curve deviates from the baseline inside the highlighted band: Deviation 10–200 kHz. Deviation 10–200 kHz
Correlation 10–200 kHz
0.87 Watch
Correlation < 2 kHz
0.99 Normal

AI draft — awaiting engineer review

EP-TX47-2026-07 05 / 06

Thermal & loading

The infrared scan places the hot-spot at 98 °C near the winding top at 0.82 pu load, with top-oil at 71 °C. The rise stays inside the design envelope, but the B-phase LV connection reads warm — the work package books a thermographic follow-up and a re-torque at the next planned outage.

Winding thermal profile Synthetic specimen data — illustrative values, not measurements from a customer fleet.
Winding thermal profile Heat strip of temperature along the transformer winding from Winding bottom to Winding top. Hot-spot 98 °C marked at 72 % of the winding height. Hot-spot 98 °C
Hot-spot
98 °C Watch
Top-oil
71 °C Normal

AI draft — awaiting engineer review

EP-TX47-2026-07 06 / 06

Engineer decision & work package

The reviewing engineer accepted the thermal hypothesis, added the bushing-PD counter-hypothesis to the monitoring plan, and approved the draft with edits. The decision, the edits, and the released work package are all on the record below.

Approved Engineer sign-off stamp: Approved, initials M.O., dated July 10, 2026. Approved M.O. July 10, 2026

M. Okafor, P.E. Senior substation engineer

Audit log

  1. Draft v2 created by agent/dga-v2.3 — confidence 0.78

  2. Draft opened for review by m.okafor

  3. Rationale edited — bushing-PD counter-hypothesis added to the monitoring plan

  4. Approved Approved — work package WP-2026-0141 released as CMMS draft

WP-2026-0141 TX-47 thermal follow-up

  • Re-sample oil in 30 days
  • Keep the PD monitor trending on the HV-B bushing
  • Thermographic follow-up on the B-phase LV connection
  • Inspect and re-torque at the next planned outage

CMMS handoff: SAP PM work order draft

Download the evidence-pack template (PDF)

Use the same structure for your own pilot deliverable.

The workflow

From raw evidence to a signed-off work package

The pack is stage 5 of the GridAPM workflow — everything before it is inspectable.

  1. Intake
  2. Correlate & quality gate
  3. Agent reasoning
  4. Engineer sign-off
  5. Work package & report

See this structure on your fleet's evidence.

A pilot fills these pages with approved customer evidence, your review criteria, and the decision workflow your engineers want to evaluate.

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