Oil_Analysis_T61_20260105.pdf
PDF 1 MB Posted
- Attached to
- Life Extension for Deerhaven Unit 1 Transformers
- Solicitation number
- 2026-093
- Issued by
- Alachua County, Graceville City, Florida
About this file
This is a Technical Oil Analysis (TOA) report for transformer DHT61, a 138 kV Westinghouse (ABB) unit located at the Deerhaven substation in Gainesville, Florida, owned by GRU (Gainesville Regional Utilities). The report documents comprehensive diagnostic testing conducted on January 5, 2026, analyzing the transformer's oil condition, dissolved gases, moisture content, fluid quality, and breathing system status. The transformer, manufactured in 1970 with a fluid volume of 4,440 gallons, has been in service for over five decades and operates under an N2-blanketed preservation system. The analysis includes 91 total oil samples collected over multiple years, with the most recent sample showing all gases at acceptable concentrations and no anomalies detected in the dissolved gas analysis.
The reliability-based diagnostics indicate a gassing status of 2, reflecting no recent production of fault gas, with an accumulated cumulative severity of 6.31% for liquid degradation and 0.18% for paper degradation. All measured parameters—including hydrogen, methane, ethane, ethylene, carbon monoxide, and carbon dioxide levels—remain within normal operating ranges. Moisture content is acceptable at 6 mg/kg with 16% relative saturation. Fluid quality analysis shows no oil degradation issues, with dielectric breakdown maintained at 50.0 kV, noncorrosive sulfur status, and an oil quality index of 0.3. PCB testing confirms non-contamination, and furan levels are within acceptable limits. Historical trend analysis spanning from 2006 to 2026 demonstrates stable transformer performance with minor fluctuations in dissolved gas composition and no indication of imminent failure, supporting the feasibility of a five-year life extension for this unit.
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Other files
| File | Type | Posted |
|---|---|---|
| Life_Extension_for_Deerhaven_Unit_1_Transformers.pdf | ||
| T61.JPEG | JPEG file | |
| T61_.JPEG | JPEG file | |
| T61___.JPEG | JPEG file | |
| T62.JPEG | JPEG file | |
| T62_Nameplate.JPG | JPG image | |
| T62_.JPEG | JPEG file | |
| T65.JPEG | JPEG file | |
| T61_Nameplate.JPG | JPG image | |
| T62___.JPEG | JPEG file | |
| T65_.JPEG | JPEG file | |
| T65_Nameplate.JPEG | JPEG file | |
| T61_T62_Outline_Drawing.pdf | ||
| T61_T62_Cabinet_Wiring_Diagram_(1).pdf | ||
| Oil_Analysis_T62_20260105_(1).pdf | ||
| Oil_Analysis_T61_20260105_(1).pdf | ||
| Power_Transformer_Maintenance_Checklist_Unit_1_(2).pdf | ||
| DH_Unit_1_Transformers_Life_Extension_Specification_2026-093.docx | DOCX document | |
| Power_Transformer_Maintenance_Checklist_Unit_1.pdf | ||
| T61_T62_Cabinet_Wiring_Diagram.pdf | ||
| Oil_Analysis_T62_20260105.pdf |
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Text version
TOA™ Analysis Report TRN DHT61
1 Report generated from GRU at 20260127T020049Z
Equipment DHT61 MVAR Actual 52.267
Serial No. 7001632 In service True
Apparatus type TRN Spare False
Owner GAINESVILLE Tank MAIN
Region GAINESVILLE Norms used TRN_IEEE_INC_69_288KV
Substation Deerhaven Gassing status 2
Norms TRN_IEEE_INC_69_288KV DGA result 1→1
Fluid type OIL Breathing result 2→2
Description Transformer Moisture result 1→1
Manufacturer Westinghouse (ABB) FQ result 1→1
Year manufactured 1970 Trace elements result 0→0
Model OA/FA Particle analysis result 0→0 kV ratings 138 PCB result 1→1
Max rated voltage 138000 Furan result 1→1
Fluid volume 4440 Oil test status UNREVIEWED
Last Analysis Done On 2026-01-26
Last sample date 2026-01-05
Tank last modified date 2026-01-26
Equipment last modified date 2020-07-17
Norms last modified date 2021-06-05
Last analysis date 2026-01-26
Read-only samples 6
Excluded samples 0
Total samples 91
Sample Remarks
Sampled Container Lab remarks
2026-01-05 AC595 A50 All gases at acceptable concentrations
2025-07-02 GW432 A50 All gases at acceptable concentrations
2024-12-10 GK996 A50 All gases at acceptable concentrations
2024-04-10 DB894 A50 All gases at acceptable concentrations
2023-09-18 AT333 A50 All gases at acceptable concentrations
2 Report generated from GRU at 20260127T020049Z
Reliability-based DGA Summary
DGA last date 2026-01-05 Cumulative sev liquid % 6.31
DGA samples 59 Cumulative sev paper % 0.18
Gassing events 6 Gassing status 2
Event fault type N/A Normalized HF ratio 0.00
HF %/yr combined 0.00
Accumulated NEI-HC
Fa ilu re r at e
6.31 %
Accumulated NEI-CO
Fa ilu re r at e
0.18 % Grey area represents cumulative gassing event severity.
Red arrow represents event severity growth rate.
Reliability-based DGA Diagnosis
No recent production of fault gas (gassing status 2). An extreme increase in CO/CO2 suggests a hotspot affecting winding insulation paper, rather than general overheating of the paper or a hotspot outside the winding.
Dissolved Gas Analysis
Lab report number 250565-003 247423-005 244280-020 240105-003 237213-003
Sample date 2026-01-05 2025-07-02 2024-12-10 2024-04-10 2023-09-18
Sample temp 11 26 20 21 27 °C
Hydrogen (H2) 2 2 4 5 10 µL/L
Methane (CH4) 13.0 13.0 14.0 13.0 14.0 µL/L
Ethane (C2H6) 7.0 6.0 7.0 6.0 7.0 µL/L
Ethylene (C2H4) 3.0 4.0 4.0 3.0 4.0 µL/L
Acetylene (C2H2) 0.0 0.0 0.0 0.0 0.0 µL/L
Carbon Monoxide (CO) 68~ 74~ 90 92 118 µL/L
Carbon Dioxide (CO2) 1180 1150 1175 1190 1201 µL/L
Oxygen (O2) 1436 1482 2092 1310 1738 µL/L
Nitrogen (N2) 82123 78595 76345 83040 81857 µL/L
Total heat gas 23 23 25 22 25 µL/L
TDCG 93 99 119 119 153 µL/L
Equivalent TCG 0.065 0.076 0.097 0.093 0.128 %
Total partial press 100.7 89.2 89.6 96.4 92.6 % atm
3 Report generated from GRU at 20260127T020049Z
Lab report number 250565-003 247423-005 244280-020 240105-003 237213-003
Est. safe handling limit 10.2 10.3 9.8 9.6 8.9 %
Predicted composite fault gas 14 15 20 22 31 µL/L
Acetylene/Hydrogen (C2H2/H2) 0.0 0.0 0.0 0.0 0.0
CO2/CO 17.353 15.541 13.056 12.935 10.178
CO/CO2 0.058 0.064 0.077 0.077 0.098
Oxygen/Nitrogen (O2/N2) 0.017 0.019 0.027 0.016 0.021
ETCG/ESHL 0.006 0.007 0.010 0.010 0.014
NEI-HC 0.09 0.09 0.10 0.08 0.10 kJ/kL
NEI-CO 1.90 1.88 1.99 2.02 2.15 kJ/kL
DGA retest days 365 365 365 365 365 days
DGA retest date 2027-01-05 2026-07-02 2025-12-10 2025-04-10 2024-09-17
DGA reference days 187.0 204.0 244.0 205.0 221.0 days
DGA result 1 1 1 1 1
Gassing status 2 2 2 2 2
HF %/yr combined 0.00 0.00 0.00 0.00 0.00
Symbol legend: ~: below min interpretation level
Dissolved Gas Analysis Remarks
No anomalies.
Dissolved Gas Analysis Summary
Variable name Value Units Description
Carbon Monoxide (CO) 68~ µL/L co~
Gassing Events
Date
NE
I-H
C [k
J/k L]
2: D1
Accumulated Hydrocarbon Gas NEI
NEI-HC
Cumulative NEI-HC Gassing Event
4 Report generated from GRU at 20260127T020049Z
Date
NE
I-C
O [k
J/k L]
6: PD
Accumulated Carbon Oxide Gas NEI
NEI-CO
Cumulative NEI-CO Gassing Event
Date
0.0
0.1
0.2
0.3
CO
/C
O2
Carbon Monoxide to Carbon Dioxide Ratio
CO/CO2
Smoothed CO/CO2 Gassing Event
ID Event Event start Start value Inc Days Samples FT RCOR % Sev % HF %/yr
1 C2H2 2005-10-12 0.000 1220.000 70 2 D1
2 HC 2003-10-27 0.496 15.167 786 6 D1 6.16 2.44
3 R 2007-10-15 0.034 0.040 771 5 119
4 R 2013-01-15 0.067 0.115 323 3 172
5 R 2019-03-25 0.043 0.084 400 2 194
6 CO 2016-04-19 9.066 2.283 1863 10 PD 0.08 0.01
Breathing Status Analysis
Sample date 2026-01-05 2025-07-02 2024-12-10 2024-04-10 2023-09-18
Oxygen (O2) 1436 1482 2092 1310 1738 µL/L
Nitrogen (N2) 82123 78595 76345 83040 81857 µL/L
Total partial press 100.7 89.2 89.6 96.4 92.6 % atm
Median O2 1482 1738 1865 1738 1738
Median N2 81857 81857 81857 83040 85632
Max deviation O2 782 782 782 428 436
Max deviation N2 6695 6695 8149 10117 10117
Predicted preservation class
N2-BLANKET N2-BLANKET N2-BLANKET N2-BLANKET N2-BLANKET
Breathing status result 2 2 2 2 2
5 Report generated from GRU at 20260127T020049Z
Breathing Status Remarks
Oil preservation type is not defined on the equipment properties. A value is required to check if it is consistent with the data. Appears to be an N2-blanketed system with positive pressure and low O2.
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 250565-003 247423-005 244280-020 240105-003 237213-003
Sample date 2026-01-05 2025-07-02 2024-12-10 2024-04-10 2023-09-18
Sample temp 11 26 20 21 27 °C
Moisture (H2O) 6 12 11 10 8 mg/kg
Relative saturation 16 17 20 17 11 %
Dew point -23 -11 -13 -14 -18 °C
Moisture result 1 1 1 1 1
Moisture Remarks
The water content of the oil is acceptable.
6 Report generated from GRU at 20260127T020049Z
Fluid Quality
Lab report number 237213-003 220686-003 219034-003 204367-009 150203-018
Sample date 2023-09-18 2020-12-07 2020-08-26 2018-03-06 2008-10-29
Sample temp 27 14 36 30 20 °C
Diel breakdown D877 50.0 49.0 47.0 50.0 kV
Acid number 0.010 0.010 0.010 0.010 mg KOH/g
Interfacial tension 36.3 36.3 34.2 37.2 mN/m
Specific Gravity 0.8800 0.8790 0.8790 0.8800
Color 2.0 2.0 1.5 2.0
Oil quality index 0.3 0.3 0.3 0.3
Visual CLEAR OK OK OK
Corrosive Sulfur D1275B Noncorrosive
Fluid quality retest days 365 365 365 365 days
Fluid quality retest date 2024-09-17 2021-12-07 2019-03-06 2009-10-29
FQ result 1 1 1 1
Fluid Quality Analysis Remarks
No oil quality problems were detected.
Furans / Alcohols
Lab report number 150203-018 136966-005
Sample date 2008-10-29 2006-05-01
Sample temp 20 40 °C
2-furfural (2FAL) 0 0 µg/L
Furan result 1 1
Furan Analysis Remarks
Furan levels are within acceptable limits.
7 Report generated from GRU at 20260127T020049Z
PCB Analysis
Lab report number 192008-003 152796-003 150203-018 136966-005
Sample date 2016-01-19 2009-05-12 2008-10-29 2006-05-01
Sample temp 40 45 20 40 °C
Total PCB 5.0 5.0 5.0 4.0 mg/kg
PCB result 1 1 1 1
PCB Remarks
Not PCB contaminated. For a report of the last PCB sample, see the PCB in Oil Report.
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
https://www.toa4online.com/toa/redirect?page=pcb_report&db=GRU&equipnum=DHT61&serialnum=7001632&apprtype=TRN&tank=MAIN
8 Report generated from GRU at 20260127T020049Z
1999 2004 2009 2014 2019 2024 2029
NEI-HC
kJ /k
L
1999 2004 2009 2014 2019 2024 2029
NEI-CO
kJ /k
L 1999 2004 2009 2014 2019 2024 2029
Hydrogen (H2) µL /L
1999 2004 2009 2014 2019 2024 2029
Methane (CH4) µL /L
1999 2004 2009 2014 2019 2024 2029
Ethane (C2H6) µL /L
1999 2004 2009 2014 2019 2024 2029
Ethylene (C2H4) µL /L
1999 2004 2009 2014 2019 2024 2029
Acetylene (C2H2) µL /L
1999 2004 2009 2014 2019 2024 2029
Carbon Monoxide (CO) µL /L
9 Report generated from GRU at 20260127T020049Z
1999 2004 2009 2014 2019 2024 2029
Carbon Dioxide (CO2) µL /L
1999 2004 2009 2014 2019 2024 2029
10000
15000
20000 Oxygen (O2) µL /L
1999 2004 2009 2014 2019 2024 2029
20000
40000
60000
80000
100000
Nitrogen (N2) µL /L
1999 2004 2009 2014 2019 2024 2029
Total heat gas µL /L
1999 2004 2009 2014 2019 2024 2029
TDCG
µL /L
1999 2004 2009 2014 2019 2024 2029 0.0
0.5
1.0
1.5
2.0 Equivalent TCG
1999 2004 2009 2014 2019 2024 2029
Total partial press a tm
1999 2004 2009 2014 2019 2024 2029
Est. safe handling limit
10 Report generated from GRU at 20260127T020049Z
1999 2004 2009 2014 2019 2024 2029
Predicted composite fault gas µL /L
1999 2004 2009 2014 2019 2024 2029
Acetylene/Hydrogen (C2H2/H2)
1999 2004 2009 2014 2019 2024 2029
CO2/CO
1999 2004 2009 2014 2019 2024 2029 0.00
0.10
0.20
0.30
CO/CO2
1999 2004 2009 2014 2019 2024 2029 0.00
0.05
0.10
0.15
0.20 Oxygen/Nitrogen (O2/N2)
1999 2004 2009 2014 2019 2024 2029 0.0
0.1
0.2
0.3
0.4
ETCG/ESHL
2006 2011 2016 2021 2026
Diel breakdown D877 kV
2006 2011 2016 2021 2026 0.00
0.05
0.10
0.15
0.20
Acid number m g
KO
H
/g
11 Report generated from GRU at 20260127T020049Z
2006 2011 2016 2021 2026
Interfacial tension m N
/m
2006 2011 2016 2021 2026 0.0
0.2
0.4
0.6
0.8
Specific Gravity
2006 2011 2016 2021 2026 0.0
0.5
1.0
1.5
2.0 Color
2006 2011 2016 2021 2026 0.00 0.05 0.10 0.15 0.20 0.25
Oil quality index
2001 2006 2011 2016 2021 2026 2031
Moisture (H2O) m g/ kg
2001 2006 2011 2016 2021 2026 2031
Relative saturation
2006 2007 2008 2009
2-furfural (2FAL) µg /L
1999 2004 2009 2014 2019 2024 2029
Sample temp
°C
12 Report generated from GRU at 20260127T020049Z
2015 2017 2019 2021 2023 2025 2027 0.00
0.01
0.02
0.03
0.04 HF %/yr combined
Raw Data Upper alert limit Lower alert limit
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