Exhibit 8toa_fluid_report_N132052_XFMR TCY KT2A-B.pdf
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- Solicitation number
- 26WA161070-SS
- Issued by
-
Department of Energy
About this file
This is a TOA™ Analysis Report for transformer equipment TCY KT2A-B (XFMR N132052) operated by TNC in the SNR-NS0 region at Tracy substation. The transformer is a 283 MVA auto transformer manufactured by Hyundai in 2001, with a maximum rated voltage of 525 kV, fluid volume of 16,138 liters, and temperature rise of 55°C. The equipment has been in service since May 1, 2002, and uses oil preservation with a conservator/diaphragm system and OA/FA/FOA cooling.
The analysis covers dissolved gas analysis (DGA), breathing status, moisture analysis, and fluid quality assessments based on ten total samples collected between May 28, 2021, and April 16, 2025. All test results indicate normal operating conditions with a gassing status of 1 (no significant fault gas production) and zero gassing events detected. Dissolved gas analysis shows acceptable levels across all measured parameters, with carbon monoxide at 866 µL/L (slightly elevated at high 351 threshold) but within acceptable ranges. Moisture content is acceptable at 10 mg/kg with 10% relative saturation. Fluid quality analysis demonstrates no oil degradation problems, with all dielectric breakdown, power factor, acid number, and interfacial tension measurements within normal ranges. The oil preservation system is confirmed as a conservator-sealed bladder/diaphragm unit operating correctly. The next recommended retest date is April 16, 2026, with all analysis status marked as unreviewed as of the October 20, 2025 report generation date.
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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 | |
| 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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TOA™ Analysis Report TCY KT2A-B / XFMR N132052
1 Report generated from WAPA at 20260218T171755Z
Equipment N132052 Fluid volume 16138
Serial No. 04873100152 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-B 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 OA/FA/FOA 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 2024-05-30
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 20260218T171755Z
Reliability-based DGA Diagnosis
No significant production of fault gas (gassing status 1).
Dissolved Gas Analysis
Lab report number 317589-024 299006-023 281605-022 274139-003 254720-014
Sample date 2025-04-16 2024-04-12 2023-02-22 2022-09-16 2021-05-28
Sample temp 35 35 42 50 40 °C
Hydrogen (H2) 0 3 2 3 3 µL/L
Methane (CH4) 15.0 14.0 10.1 13.9 14.2 µL/L
Ethane (C2H6) 2.1 2.0 1.7 1.8 1.8 µL/L
Ethylene (C2H4) 1.1 0.8 0.4 0.5 0.8 µL/L
Acetylene (C2H2) 0.0 0.0 0.0 0.0 0.0 µL/L
Carbon Monoxide (CO) 866* 832* 859* 906* 926* µL/L
Carbon Dioxide (CO2) 1280 1233 1253 1768 1214 µL/L
Oxygen (O2) 1890 2700 2410 2080 2850 µL/L
Nitrogen (N2) 26200 27300 27200 27300 32200 µL/L
Total heat gas 18 17 12 16 17 µL/L
TDCG 884 851 873 925 946 µL/L
Equivalent TCG 2.290 2.101 2.200 2.358 2.010 %
Total partial press 30.1 31.8 30.7 29.8 36.5 % atm
Est. safe handling limit 12.4 12.2 12.3 12.2 12.2 %
Predicted composite fault gas 156 152 156 166 169 µL/L
Acetylene/Hydrogen (C2H2/H2) 0.0 0.0 0.0 0.0
CO2/CO 1.478 1.482 1.459 1.951 1.311
CO/CO2 0.677 0.675 0.686 0.512 0.763
Oxygen/Nitrogen (O2/N2) 0.072 0.099 0.089 0.076 0.089
ETCG/ESHL 0.185 0.172 0.179 0.193 0.164
NEI-HC 0.07 0.06 0.04 0.06 0.06 kJ/kL
NEI-CO 5.65 5.43 5.58 6.48 5.83 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 20260218T171755Z
Dissolved Gas Analysis Remarks
No anomalies.
Dissolved Gas Analysis Summary
Variable name Value Units Description
Carbon Monoxide (CO) 866* 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 20260218T171755Z
Breathing Status Analysis
Sample date 2025-04-16 2024-04-12 2023-02-22 2022-09-16 2021-05-28
Oxygen (O2) 1890 2700 2410 2080 2850 µL/L
Nitrogen (N2) 26200 27300 27200 27300 32200 µL/L
Total partial press
30.1 31.8 30.7 29.8 36.5 % atm
Median O2 2410 2410 2080 2080 1670
Median N2 27300 27300 27200 25200 25200
Max deviation O2
810 1570 1570 1856 1856
Max deviation N2
4900 7000 7000 7000 7000
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.
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 20260218T171755Z
Moisture Analysis
Lab report number 317589-024 299006-023 281605-022 274139-003 254720-014
Sample date 2025-04-16 2024-04-12 2023-02-22 2022-09-16 2021-05-28
Sample temp 35 35 42 50 40 °C
Moisture (H2O) 10 6 5 1 3 mg/kg
Relative saturation 10 6 4 1 2 %
Dew point -14 -23 -26 -50 -34 °C
Moisture result 1 1 1 1 1
Moisture Remarks
The water content of the oil is acceptable.
Fluid Quality
Lab report number 317589-024 299006-023 281605-022 274139-003 254720-014
Sample date 2025-04-16 2024-04-12 2023-02-22 2022-09-16 2021-05-28
Sample temp 35 35 42 50 40 °C
Diel brk D1816 (1 mm) 40.0 39.0 45.0 40.0 44.0 kV
Diel breakdown D877 46.0 50.0 50.0 54.0 52.0 kV
PF at 25°C 0.007 0.005 0.006 0.008 0.006 %
PF at 100°C 0.282 0.219 0.234 0.243 0.200 %
Acid number 0.000 0.000 0.000 0.010 0.000 mg KOH/g
Interfacial tension 43.5 45.6 44.6 43.8 46.0 mN/m
Specific Gravity 0.8900 0.8900 0.8894 0.8896 0.8892
Viscosity 9.540 9.540 9.540 9.540 9.540 cSt
Flash point 148 152 160 158 150 °C
Color L1.0 L1.0 L 0.5 L 1.0 L 0.5
Oil quality index 0.0 0.0 0.0 0.2 0.0
PF100/PF25 40.286 43.800 39.000 30.375 33.333
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 20260218T171755Z
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 20260218T171755Z
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
Oxygen (O2) µL /L
2016 2018 2020 2022 2024 2026
10000 20000 30000 40000 50000 60000
Nitrogen (N2) µL /L
2016 2018 2020 2022 2024 2026
Total heat gas µL /L
8 Report generated from WAPA at 20260218T171755Z
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 20260218T171755Z
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 0.00
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
10 Report generated from WAPA at 20260218T171755Z
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 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 20260218T171755Z
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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