Exhibit 9 toa_fluid_report_N132053_XFMR TCY KT2A-C.pdf
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- Solicitation number
- 26WA161070-SS
- Issued by
-
Department of Energy
About this file
This is a technical analysis report for transformer equipment TCY KT2A-C (XFMR N132053) owned by TNC and located at the Tracy substation in region SNR-NS0. The transformer is a 283 MVA auto transformer manufactured by Hyundai in 2001, rated at 525 kV maximum voltage, with a fluid volume of 16,138 liters and a temperature rise of 55°C. The unit has been in service since May 1, 2002, and uses an oil preservation system with conservator/diaphragm configuration and ONAN/ONAF/ONAF cooling.
The most recent analysis completed on October 20, 2025, based on a sample collected April 16, 2025, indicates the transformer is in good operational condition with no significant fault gas production (gassing status 1). Dissolved Gas Analysis shows stable levels across ten samples collected since May 2021, with all DGA results at status 1 and zero gassing events detected. The sole abnormality identified is an elevated carbon monoxide (CO) level of 746 µL/L (above the normal threshold of 351 µL/L), though this does not indicate an active fault condition. All other diagnostic measures—breathing status, moisture content, fluid quality, trace elements, particle analysis, PCB, and furan—returned favorable results (status 1). The breathing analysis confirms the declared conservator-sealed oil preservation type is consistent with measured oxygen and nitrogen levels. Oil quality remains acceptable with no degradation detected in dielectric breakdown, power factor, acid number, interfacial tension, or other fluid properties. Recommended retest intervals are 365 days for all analysis categories.
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Other files
| File | Type | Posted |
|---|---|---|
| Exhibit 6.jpeg | JPEG file | |
| Exhibit 7 toa_fluid_report_N132051_XFMR TCY KT2A-A.pdf | ||
| 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 |
Show all 11
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Text version
TOA™ Analysis Report TCY KT2A-C / XFMR N132053
1 Report generated from WAPA at 20260218T171828Z
Equipment N132053 Fluid volume 16138
Serial No. 04873100153 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-C 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/ONAF 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 HF %/yr combined 0.00
DGA samples 10 Gassing status 1
Gassing events 0 Normalized HF ratio 0.00
Event fault type N/A
2 Report generated from WAPA at 20260218T171828Z
Reliability-based DGA Diagnosis
No significant production of fault gas (gassing status 1).
Dissolved Gas Analysis
Lab report number 317589-027 299006-024 281605-015 274139-009 254720-004
Sample date 2025-04-16 2024-04-12 2023-02-22 2022-09-16 2021-05-28
Sample temp 40 35 45 45 45 °C
Hydrogen (H2) 0 2 2 2 2 µL/L
Methane (CH4) 14.0 13.0 10.5 13.1 13.3 µL/L
Ethane (C2H6) 2.1 1.9 1.6 1.8 1.8 µL/L
Ethylene (C2H4) 0.9 0.8 0.5 0.4 0.7 µL/L
Acetylene (C2H2) 0.0 0.0 0.0 0.0 0.0 µL/L
Carbon Monoxide (CO) 746* 736* 666* 803* 771* µL/L
Carbon Dioxide (CO2) 1190 1147 1136 1647 1102 µL/L
Oxygen (O2) 1000 1700 3820 1980 7220 µL/L
Nitrogen (N2) 23400 25000 27300 27000 54000 µL/L
Total heat gas 17 16 13 15 16 µL/L
TDCG 763 754 681 820 789 µL/L
Equivalent TCG 2.264 2.061 1.677 2.103 0.993 %
Total partial press 26.0 28.6 31.1 29.9 60.8 % atm
Est. safe handling limit 12.4 12.3 12.2 12.3 12.2 %
Predicted composite fault gas 134 134 122 146 141 µL/L
Acetylene/Hydrogen (C2H2/H2) 0.0 0.0 0.0 0.0
CO2/CO 1.595 1.558 1.706 2.051 1.429
CO/CO2 0.627 0.642 0.586 0.488 0.700
Oxygen/Nitrogen (O2/N2) 0.043 0.068 0.140 0.073 0.134
ETCG/ESHL 0.183 0.168 0.137 0.171 0.081
NEI-HC 0.06 0.06 0.05 0.05 0.06 kJ/kL
NEI-CO 4.98 4.88 4.55 5.85 4.98 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 20260218T171828Z
Dissolved Gas Analysis Remarks
No anomalies.
Dissolved Gas Analysis Summary
Variable name Value Units Description
Carbon Monoxide (CO) 746* 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
CO
/C
O2
Carbon Monoxide to Carbon Dioxide Ratio
Smoothed CO/CO2
No significant gassing events detected.
4 Report generated from WAPA at 20260218T171828Z
Breathing Status Analysis
Sample date 2025-04-16 2024-04-12 2023-02-22 2022-09-16 2021-05-28
Oxygen (O2) 1000 1700 3820 1980 7220 µL/L
Nitrogen (N2) 23400 25000 27300 27000 54000 µL/L
Total partial press
26.0 28.6 31.1 29.9 60.8 % atm
Median O2 1980 1980 1980 1980 1430
Median N2 27000 27000 27000 24500 23700
Max deviation O2
5240 5790 5790 5790 5790
Max deviation N2
27000 29500 29500 29500 29500
Declared preservation class
CONSERVATOR-
SEALED
CONSERVATOR-
SEALED
CONSERVATOR-
SEALED
CONSERVATOR-
SEALED
CONSERVATOR-
SEALED
Predicted preservation class
CONSERVATOR-
SEALED
CONSERVATOR-
SEALED
CONSERVATOR-
SEALED
CONSERVATOR-
SEALED
AIR
Breathing status result
1 1 1 1 3
Breathing Status Remarks
Declared oil preservation type is consistent with the data. Appears to be a conservator bladder/diaphragm sealed unit.
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
5 Report generated from WAPA at 20260218T171828Z
Moisture Analysis
Lab report number 317589-027 299006-024 281605-015 274139-009 254720-004
Sample date 2025-04-16 2024-04-12 2023-02-22 2022-09-16 2021-05-28
Sample temp 40 35 45 45 45 °C
Moisture (H2O) 8 8 6 1 2 mg/kg
Relative saturation 7 8 4 1 1 %
Dew point -18 -18 -23 -50 -40 °C
Moisture result 1 1 1 1 1
Moisture Remarks
The water content of the oil is acceptable.
Fluid Quality
Lab report number 317589-027 299006-024 281605-015 274139-009 254720-004
Sample date 2025-04-16 2024-04-12 2023-02-22 2022-09-16 2021-05-28
Sample temp 40 35 45 45 45 °C
Diel brk D1816 (1 mm) 39.0 41.0 41.0 40.0 40.0 kV
Diel breakdown D877 46.0 50.0 49.0 64.0 48.0 kV
PF at 25°C 0.006 0.004 0.004 0.010 0.010 %
PF at 100°C 0.217 0.183 0.224 0.295 0.171 %
Acid number 0.000 0.000 0.010 0.000 0.000 mg KOH/g
Interfacial tension 42.9 45.5 44.4 44.1 45.0 mN/m
Specific Gravity 0.8900 0.8900 0.8897 0.8897 0.8893
Viscosity 9.540 9.530 9.520 9.530 9.530 cSt
Flash point 150 154 156 156 156 °C
Color L1.0 L1.0 L 0.5 L 1.0 L 0.5
Oil quality index 0.0 0.0 0.2 0.0 0.0
PF100/PF25 36.167 45.750 56.000 29.500 17.100
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.
6 Report generated from WAPA at 20260218T171828Z
History Graphs and Diagnostic Charts µL /L
Hydrocarbon gases and hydrogen
H2
CH4
C2H6 C2H4 C2H2 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
7 Report generated from WAPA at 20260218T171828Z
2016 2018 2020 2022 2024 2026
Ethane (C2H6) µL /L
2016 2018 2020 2022 2024 2026
Ethylene (C2H4) µL /L
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 25000 30000
Oxygen (O2) µL /L
2016 2018 2020 2022 2024 2026
20000
40000
60000
80000
Nitrogen (N2) µL /L
2016 2018 2020 2022 2024 2026
Total heat gas µL /L
8 Report generated from WAPA at 20260218T171828Z
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
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
9 Report generated from WAPA at 20260218T171828Z
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
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 0.0
0.2
0.4
0.6
0.8 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
10 Report generated from WAPA at 20260218T171828Z
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
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
1.0 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
11 Report generated from WAPA at 20260218T171828Z
2016 2018 2020 2022 2024
Air temperature
°C
2016 2018 2020 2022 2024 2026
Sample temp
°C 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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