Exhibit 7 toa_fluid_report_N132051_XFMR TCY KT2A-A.pdf
PDF 1 MB Posted
- Solicitation number
- 26WA161070-SS
- Issued by
-
Department of Energy
About this file
This is a TOA™ (Transformer Oil Analysis) technical report for a power transformer (TCY KT2A-A / XFMR N132051) owned by TNC and located at Tracy Substation. The transformer is a 283 MVA auto transformer manufactured by Hyundai in 2001, currently in service since May 2002, with a maximum rated voltage of 525 kV and oil preservation type of conservator/diaphragm.
The analysis report, generated on February 18, 2026, provides comprehensive testing results based on ten samples collected between May 2021 and April 2025. All diagnostic test results indicate normal equipment condition with no significant fault gas production (gassing status 1). Dissolved Gas Analysis shows carbon monoxide levels at 771 µL/L flagged as abnormally high (threshold 351 µL/L), though the report notes no anomalies overall and confirms no significant production of fault gas. Key measurements include total dissolved combustible gas (TDCG) of 789 µL/L, equivalent TCG of 2.370%, and predicted composite fault gas of 139 µL/L, all within acceptable ranges. Fluid quality analysis confirms no oil quality problems with acceptable moisture content (8 mg/kg), dielectric breakdown strength of 44.0 kV (D877), acid number of 0.000 mg KOH/g, and interfacial tension of 43.8 mN/m. Breathing status analysis confirms the transformer operates as a conservator-sealed unit consistent with its design specifications. The recommended retest date for all analyses is April 16, 2026, with all historical results spanning 2017-2025 showing stable performance trends.
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Other files
| File | Type | Posted |
|---|---|---|
| Exhibit 6.jpeg | JPEG file | |
| Exhibit 10.jpeg | JPEG file | |
| Exhibit 5.jpeg | JPEG file | |
| Exhibit 3.jpeg | JPEG file | |
| Exhibit 12.jpeg | JPEG file | |
| Exhibit 8toa_fluid_report_N132052_XFMR TCY KT2A-B.pdf | ||
| PWS-TCY-KT2A_TransformerRefurbishment-2026-03-23_Redacted.pdf | ||
| Exhibit 11.jpeg | JPEG file | |
| Exhibit 4.jpeg | JPEG file | |
| Exhibit 13.jpeg | JPEG file | |
| Exhibit 9 toa_fluid_report_N132053_XFMR TCY KT2A-C.pdf |
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Text version
TOA™ Analysis Report TCY KT2A-A / XFMR N132051
1 Report generated from WAPA at 20260218T171656Z
Equipment N132051 Fluid volume 16138
Serial No. 04873100151 Temperature rise (°C) 55
Apparatus type XFMR Three-Phase False
Owner TNC In service True
Region SNR-NS0 In service date 2002-05-01
Substation Tracy Tank MAIN
Designation TCY KT2A-A Norms used TRN_IEEE_INC_345KV
Norms TRN_IEEE_INC_345KV Gassing status 1
Fluid type OIL DGA result 1→1
Description AUTO TRANSFORMER Breathing result 1→1
Manufacturer HYUNDAI Moisture result 1→1
Year manufactured 2001 FQ result 1→1
Model 04873T10015 Trace elements result 0→0
MVA ratings 283 Particle analysis result 0→0
Max rated voltage 525 PCB result 0→0
Oil preservation type CONSERVATOR/DIAPHRAGM Furan result 0→0
Cooling ONAN/ONAF/OFAF Oil test status UNREVIEWED
Last Analysis Done On 2025-10-20
Last sample date 2025-04-16
Tank last modified date 2025-07-22
Equipment last modified date 2025-04-03
Norms last modified date 2021-06-05
Last analysis date 2025-10-20
Read-only samples 0
Excluded samples 0
Total samples 10
Reliability-based DGA Summary
DGA last date 2025-04-16 Cumulative sev liquid % 0.00
DGA samples 10 Cumulative sev paper % 0.00
Gassing events 1 Gassing status 1
Event fault type N/A Normalized HF ratio 0.00
HF %/yr combined 0.00
2 Report generated from WAPA at 20260218T171656Z
Reliability-based DGA Diagnosis
No significant production of fault gas (gassing status 1).
Dissolved Gas Analysis
Lab report number 317589-029 299006-022 281605-005 274139-002 254720-019
Sample date 2025-04-16 2024-04-12 2023-02-22 2022-09-16 2021-05-28
Sample temp 35 35 45 50 45 °C
Hydrogen (H2) 0 5 2 2 2 µL/L
Methane (CH4) 15.0 13.0 9.9 13.1 13.2 µL/L
Ethane (C2H6) 1.9 1.7 1.4 1.6 1.5 µL/L
Ethylene (C2H4) 0.7 0.5 0.3 0.3 0.4 µL/L
Acetylene (C2H2) 0.0 0.0 0.0 0.0 0.0 µL/L
Carbon Monoxide (CO) 771* 727* 711* 804* 820* µL/L
Carbon Dioxide (CO2) 1210 1104 1080 1652 1100 µL/L
Oxygen (O2) 960 2000 2630 1450 956 µL/L
Nitrogen (N2) 22900 23800 24500 24900 21000 µL/L
Total heat gas 18 15 12 15 15 µL/L
TDCG 789 747 724 821 837 µL/L
Equivalent TCG 2.370 2.138 2.019 2.316 2.789 %
Total partial press 25.9 27.5 27.5 26.9 23.0 % atm
Est. safe handling limit 12.4 12.0 12.3 12.2 12.2 %
Predicted composite fault gas 139 136 130 147 150 µL/L
Acetylene/Hydrogen (C2H2/H2) 0.0 0.0 0.0 0.0
CO2/CO 1.569 1.519 1.519 2.055 1.341
CO/CO2 0.637 0.659 0.658 0.487 0.745
Oxygen/Nitrogen (O2/N2) 0.042 0.084 0.107 0.058 0.046
ETCG/ESHL 0.191 0.178 0.165 0.189 0.228
NEI-HC 0.06 0.05 0.04 0.05 0.05 kJ/kL
NEI-CO 5.12 4.78 4.67 5.87 5.19 kJ/kL
DGA retest days 365 365 365 365 365 days
DGA retest date 2026-04-16 2025-04-12 2024-02-22 2023-09-16 2022-05-28
DGA reference days 369.0 415.0 159.0 476.0 234.0 days
DGA result 1 1 1 1 1
Gassing status 1 1 1 1 1
HF %/yr combined 0.00 0.00 0.00 0.00 0.00
Symbol legend: *: abnormal level
3 Report generated from WAPA at 20260218T171656Z
Dissolved Gas Analysis Remarks
No anomalies.
Dissolved Gas Analysis Summary
Variable name Value Units Description
Carbon Monoxide (CO) 771* µL/L Level alert (high 351).
co*
Gassing Events
Date
0.0
0.2
0.4
NE
I-H
C [k
J/k L]
Accumulated Hydrocarbon Gas NEI
NEI-HC
Cumulative NEI-HC
Date
NE
I-C
O [k
J/k L]
Accumulated Carbon Oxide Gas NEI
NEI-CO
Cumulative NEI-CO
Date
0.0
0.2
0.4
0.6
0.8
CO
/C
O2
Carbon Monoxide to Carbon Dioxide Ratio
Smoothed CO/CO2 Gassing Event
4 Report generated from WAPA at 20260218T171656Z
ID Event Event start Start value Inc Days Samples FT RCOR % Sev % HF %/yr
1 R 2022-09-16 0.487 0.172 574 3 35
Breathing Status Analysis
Sample date 2025-04-16 2024-04-12 2023-02-22 2022-09-16 2021-05-28
Oxygen (O2) 960 2000 2630 1450 956 µL/L
Nitrogen (N2) 22900 23800 24500 24900 21000 µL/L
Total partial press
25.9 27.5 27.5 26.9 23.0 % atm
Median O2 1450 1450 1140 1140 1080
Median N2 23800 23800 23100 21900 21800
Max deviation O2
1180 1180 1180 1179 1179
Max deviation N2
3900 3900 3900 3900 3200
Declared preservation class
CONSERVATOR-
SEALED
CONSERVATOR-
SEALED
CONSERVATOR-
SEALED
CONSERVATOR-
SEALED
CONSERVATOR-
SEALED
Predicted preservation class
CONSERVATOR-
SEALED
CONSERVATOR-
SEALED
CONSERVATOR-
SEALED
CONSERVATOR-
SEALED
CONSERVATOR-
SEALED
Breathing status result
1 1 1 1 1
Breathing Status Remarks
Declared oil preservation type is consistent with the data. Appears to be a conservator bladder/diaphragm sealed unit.
5 Report generated from WAPA at 20260218T171656Z
O2 & N2 Diagram
O2/N2 = 0.5
Supersaturated
0 5000 10000 15000 20000 25000 30000 35000 Oxygen (O2) [µL/L]
20000
40000
60000
80000
100000
Ni to rg en
(N 2)
[µ L/
L]
Oil Preservation System as a Function of O2 and N2
Air
Cons-Sealed
N2-blanket Sealed
Super-atmospheric (Pressurized) Atmospheric (Air) Sub-atmospheric (Sealed) Illogical Previous sample(s) Latest sample Time Progression
Moisture Analysis
Lab report number 317589-029 299006-022 281605-005 274139-002 254720-019
Sample date 2025-04-16 2024-04-12 2023-02-22 2022-09-16 2021-05-28
Sample temp 35 35 45 50 45 °C
Moisture (H2O) 8 5 3 1 2 mg/kg
Relative saturation 8 5 2 1 1 %
Dew point -18 -26 -34 -50 -40 °C
Moisture result 1 1 1 1 1
Moisture Remarks
The water content of the oil is acceptable.
6 Report generated from WAPA at 20260218T171656Z
Fluid Quality
Lab report number 317589-029 299006-022 281605-005 274139-002 254720-019
Sample date 2025-04-16 2024-04-12 2023-02-22 2022-09-16 2021-05-28
Sample temp 35 35 45 50 45 °C
Diel brk D1816 (1 mm) 38.0 40.0 38.0 42.0 44.0 kV
Diel breakdown D877 44.0 50.0 48.0 50.0 45.0 kV
PF at 25°C 0.006 0.004 0.005 0.007 0.004 %
PF at 100°C 0.223 0.215 0.183 0.179 0.271 %
Acid number 0.000 0.000 0.000 0.000 0.000 mg KOH/g
Interfacial tension 43.8 45.8 43.8 44.7 44.0 mN/m
Specific Gravity 0.8890 0.8890 0.8889 0.8882 0.8882
Viscosity 9.130 9.120 9.120 9.130 9.130 cSt
Flash point 148 156 156 152 156 °C
Color L1.0 0.5 L 0.5 L 0.5 L 0.5
Oil quality index 0.0 0.0 0.0 0.0 0.0
PF100/PF25 37.167 53.750 36.600 25.571 67.750
Visual C&B C&B C&B C&B C&B
Fluid quality retest days 365 365 365 365 365 days
Fluid quality retest date 2026-04-16 2025-04-12 2024-02-22 2023-09-16 2022-05-28
FQ result 1 1 1 1 1
Fluid Quality Analysis Remarks
No oil quality problems were detected.
History Graphs and Diagnostic Charts µL /L
Hydrocarbon gases and hydrogen
H2
CH4
C2H6 C2H4 C2H2
7 Report generated from WAPA at 20260218T171656Z µL /L
Atmospheric gases and carbon monoxide
N2 O2
CO2
CO
2016 2018 2020 2022 2024 2026 0.00
0.02
0.04
0.06
NEI-HC
kJ /k
L
2016 2018 2020 2022 2024 2026
NEI-CO
kJ /k
L
2016 2018 2020 2022 2024 2026
Hydrogen (H2) µL /L
2016 2018 2020 2022 2024 2026
Methane (CH4) µL /L
2016 2018 2020 2022 2024 2026
Ethane (C2H6) µL /L
2016 2018 2020 2022 2024 2026
Ethylene (C2H4) µL /L
8 Report generated from WAPA at 20260218T171656Z
2016 2018 2020 2022 2024 2026 0.0
1.0
2.0
3.0
Acetylene (C2H2) µL /L
2016 2018 2020 2022 2024 2026
Carbon Monoxide (CO) µL /L
2016 2018 2020 2022 2024 2026
Carbon Dioxide (CO2) µL /L
2016 2018 2020 2022 2024 2026
10000
15000
20000 Oxygen (O2) µL /L
2016 2018 2020 2022 2024 2026
20000
40000
60000
Nitrogen (N2) µL /L
2016 2018 2020 2022 2024 2026
Total heat gas µL /L
2016 2018 2020 2022 2024 2026
TDCG
µL /L
2016 2018 2020 2022 2024 2026 0.0 0.5 1.0 1.5 2.0 2.5 3.0
Equivalent TCG
9 Report generated from WAPA at 20260218T171656Z
2016 2018 2020 2022 2024 2026
Total partial press a tm
2016 2018 2020 2022 2024 2026
Est. safe handling limit
2016 2018 2020 2022 2024 2026
Predicted composite fault gas µL /L
2016 2018 2020 2022 2024 2026
-0.4
-0.2
0.0
0.2
0.4
Acetylene/Hydrogen (C2H2/H2)
2016 2018 2020 2022 2024 2026
CO2/CO
2016 2018 2020 2022 2024 2026 0.0
0.2
0.4
0.6
0.8
CO/CO2
2016 2018 2020 2022 2024 2026 0.00
0.10
0.20
0.30 Oxygen/Nitrogen (O2/N2)
2016 2018 2020 2022 2024 2026 0.00
0.10
0.20
0.30
ETCG/ESHL
10 Report generated from WAPA at 20260218T171656Z
2016 2018 2020 2022 2024 2026
Diel brk D1816 (1 mm) kV
2016 2018 2020 2022 2024 2026
Diel breakdown D877 kV 2016 2018 2020 2022 2024 2026
0.000 0.005 0.010 0.015 0.020 0.025 0.030
PF at 25°C
2016 2018 2020 2022 2024 2026 0.00
0.10
0.20
0.30 PF at 100°C
2016 2018 2020 2022 2024 2026 0.00
0.02
0.04
0.06
0.08
0.10
Acid number m g
KO
H
/g
2016 2018 2020 2022 2024 2026
Interfacial tension m N
/m
2016 2018 2020 2022 2024 2026 0.0
0.2
0.4
0.6
0.8
Specific Gravity
2016 2018 2020 2022 2024 2026
Viscosity cS t
11 Report generated from WAPA at 20260218T171656Z
2016 2018 2020 2022 2024 2026
Flash point
°C
2016 2018 2020 2022 2024 2026 0.0
0.2
0.4
0.6
0.8 Color
2016 2018 2020 2022 2024 2026 0.00
0.10
0.20
0.30 Oil quality index
2016 2018 2020 2022 2024 2026
PF100/PF25
2016 2018 2020 2022 2024 2026
Moisture (H2O) m g/ kg
2016 2018 2020 2022 2024 2026
Relative saturation
2016 2018 2020 2022 2024
Air temperature
°C
2016 2018 2020 2022 2024 2026
Sample temp
°C
12 Report generated from WAPA at 20260218T171656Z
2016 2018 2020 2022 2024 2026
-0.4
-0.2
0.0
0.2
0.4
HF %/yr combined
Raw Data Upper alert limit Lower alert limit
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