Oil_Analysis_T62_20260105_(1).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 Transformer Oil Analysis (TOA) report for equipment DHT62, a 138 kV transformer owned by Gainesville Regional Utilities (GRU) located at Deerhaven Substation in Florida. The transformer, manufactured by Westinghouse (ABB) in 1970 with an OA/FA cooling model and 4,440 liters of fluid volume, was last analyzed on January 26, 2026, based on an oil sample collected on January 5, 2026. The report provides comprehensive diagnostic analysis of the transformer's condition through dissolved gas analysis (DGA), breathing status, moisture content, fluid quality, furan levels, and PCB contamination assessment across 87 total samples accumulated over the equipment's operational history.
The analysis indicates the transformer is in generally acceptable operational condition with no anomalies detected in current oil quality assessments. The DGA results show gassing status 2, meaning no recent production of fault gas, with a moderate increase in CO/CO2 ratios suggesting general overheating of insulating paper outside the windings rather than hotspot faulting. Combustible gas concentrations have decreased since the last analysis, and the transformer appears to have an effective N2-blanketed oil preservation system with positive pressure and low oxygen levels. Historical data spanning from 2000 to 2026 shows ten gassing events, with the most recent occurring on December 10, 2024. The next DGA retest is scheduled for January 5, 2027. Fluid quality parameters including dielectric breakdown (47.0 kV), acid number (0.012 mg KOH/g), interfacial tension (31.6 mN/m), and furan levels remain within acceptable limits, with no PCB contamination detected. The equipment's reliable performance history and current condition assessment support continued operation with routine monitoring and scheduled maintenance aligned with GRU's life extension objectives for the Deerhaven Unit 1 transformer fleet.
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Other files
| File | Type | Posted |
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| Life_Extension_for_Deerhaven_Unit_1_Transformers.pdf | ||
| T65.JPEG | JPEG file | |
| T62_.JPEG | JPEG file | |
| T61.JPEG | JPEG file | |
| T61_.JPEG | JPEG file | |
| T61___.JPEG | JPEG file | |
| T62.JPEG | JPEG file | |
| T62_Nameplate.JPG | JPG image | |
| T61_Nameplate.JPG | JPG image | |
| T62___.JPEG | JPEG file | |
| T65_.JPEG | JPEG file | |
| T65_Nameplate.JPEG | JPEG file | |
| T61_T62_Cabinet_Wiring_Diagram_(1).pdf | ||
| T61_T62_Outline_Drawing.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 | ||
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| Oil_Analysis_T61_20260105.pdf | ||
| Oil_Analysis_T62_20260105.pdf |
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Text version
TOA™ Analysis Report TRN DHT62
1 Report generated from GRU at 20260127T020114Z
Equipment DHT62 MVAR Actual 52.267
Serial No. 7001633 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 2↘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 5
Excluded samples 0
Total samples 87
Sample Remarks
Sampled Container Lab remarks
2026-01-05 EX092 A50 Concentrations of combustible gases have decreased
2025-07-02 GA164 A50 Concentrations of combustible gases not increasing
2024-12-10 AT314 A50 Concentrations of combustible gases not increasing
2024-04-10 ER379 A50 Concentrations of combustible gases not increasing
2023-09-18 FZ914 A50 Concentrations of combustible gases not increasing significantly
2 Report generated from GRU at 20260127T020114Z
Reliability-based DGA Summary
DGA last date 2026-01-05 Cumulative sev liquid % 1.07
DGA samples 61 Cumulative sev paper % 0.00
Gassing events 10 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
1.07 % 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). A moderate increase in CO/CO2 suggests general overheating of insulating paper outside the windings, rather than the hotspot.
Dissolved Gas Analysis
Lab report number 250565-002 247423-004 244280-019 240105-002 237213-002
Sample date 2026-01-05 2025-07-02 2024-12-10 2024-04-10 2023-09-18
Sample temp 12 27 19 22 27 °C
Hydrogen (H2) 52 98! 26 19 17! µL/L
Methane (CH4) 5.0 10.0 14.0 36.0 45.0! µL/L
Ethane (C2H6) 38.0 63.0 110.0* 180.0* 209.0* µL/L
Ethylene (C2H4) 2.0 3.0 5.0 7.0 9.0 µL/L
Acetylene (C2H2) 0.0 0.0 0.0 0.0 0.0 µL/L
Carbon Monoxide (CO) 77 143 69 59 54 µL/L
Carbon Dioxide (CO2) 755 881 599 447 360 µL/L
Oxygen (O2) 3006 1731 2538 1208 1716 µL/L
Nitrogen (N2) 80036 81381 77652 81536 78580 µL/L
Total heat gas 45 76 129 223 263 µL/L
TDCG 174 317 224 301 334 µL/L
Equivalent TCG 0.184 0.336 0.129 0.110 0.110 %
Total partial press 98.6 92.2 91.9 94.1 88.8 % atm
3 Report generated from GRU at 20260127T020114Z
Lab report number 250565-002 247423-004 244280-019 240105-002 237213-002
Est. safe handling limit 5.3 5.4 5.9 5.8 5.7 %
Predicted composite fault gas 66 124 38 30 27 µL/L
Acetylene/Hydrogen (C2H2/H2) 0.0 0.0 0.0 0.0 0.0
CO2/CO 9.805 6.161 8.681 7.576 6.667
CO/CO2 0.102 0.162 0.115 0.132 0.150
Oxygen/Nitrogen (O2/N2) 0.038 0.021 0.033 0.015 0.022
ETCG/ESHL 0.035 0.063 0.022 0.019 0.019
NEI-HC 0.19 0.31 0.53 0.91 1.07 kJ/kL
NEI-CO 1.37 1.83 1.12 0.87 0.73 kJ/kL
DGA retest days 365 365 90 90 90 days
DGA retest date 2027-01-05 2026-07-02 2025-03-10 2024-07-09 2023-12-17
DGA reference days 187.0 204.0 244.0 205.0 221.0 days
DGA result 1 1 2 2 2
DGA diagnosis T2 T1 T1
Gassing status 2 2 2 3 3
HF %/yr combined 0.00 0.00 0.00 0.04 0.08
Symbol legend: !: sharp jump, *: abnormal level
Dissolved Gas Analysis Remarks
No anomalies.
Gassing Events
Date
NE
I-H
C [k
J/k L]
3: T1 6: T1
8: T1|PD
Accumulated Hydrocarbon Gas NEI
NEI-HC
Cumulative NEI-HC Gassing Event
4 Report generated from GRU at 20260127T020114Z
Date
NE
I-C
O [k
J/k L]
Accumulated Carbon Oxide Gas NEI
NEI-CO
Cumulative NEI-CO
Date
0.00
0.05
0.10
0.15
CO
/C
O2
1 2 4 5
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 R 2002-10-29 0.012 0.025 890 6 199
2 R 2005-10-12 0.024 0.018 201 2 73
3 HC 2003-04-15 0.510 0.447 1112 7 T1 0.21 0.14
4 R 2007-10-15 0.012 0.006 1661 10 47
5 R 2016-01-19 0.019 0.009 359 4 50
6 HC 2011-05-31 0.990 0.267 2260 15 T1 0.13 0.01
7 R 2018-09-19 0.022 0.109 1142 12 498
8 HC 2020-12-07 1.273 1.112 1015 13 T1|PD 0.55 0.04
9 R 2021-11-29 0.059 0.091 658 5 155
10 R 2024-12-10 0.115 0.047 204 2 41
Breathing Status Analysis
Sample date 2026-01-05 2025-07-02 2024-12-10 2024-04-10 2023-09-18
Oxygen (O2) 3006 1731 2538 1208 1716 µL/L
Nitrogen (N2) 80036 81381 77652 81536 78580 µL/L
Total partial press 98.6 92.2 91.9 94.1 88.8 % atm
Median O2 1731 1731 1907 1907 1907
Median N2 80036 81381 81536 81536 86654
Max deviation O2 1330 1330 2406 2406 2406
Max deviation N2 3884 8735 8735 8735 8735
5 Report generated from GRU at 20260127T020114Z
Sample date 2026-01-05 2025-07-02 2024-12-10 2024-04-10 2023-09-18
Predicted preservation class
N2-BLANKET N2-BLANKET N2-BLANKET N2-BLANKET N2-BLANKET
Breathing status result 2 2 2 2 2
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 250565-002 247423-004 244280-019 240105-002 237213-002
Sample date 2026-01-05 2025-07-02 2024-12-10 2024-04-10 2023-09-18
Sample temp 12 27 19 22 27 °C
Moisture (H2O) 10 22 19 14 13 mg/kg
Relative saturation 26 30* 36* 23 18 %
Dew point -14 0 -2 -8 -10 °C
Moisture result 1 2 2 1 1
Moisture diagnosis HUMID-OIL HUMID-OIL
Symbol legend: *: abnormal level
6 Report generated from GRU at 20260127T020114Z
Moisture Remarks
The water content of the oil is acceptable.
Fluid Quality
Lab report number 237213-002 224586-001 224426-001 220686-002 219034-002
Sample date 2023-09-18 2021-08-04 2021-07-26 2020-12-07 2020-08-26
Sample temp 27 27 13 34 °C
Diel breakdown D877 47.0 55.0 47.0 52.0 kV
PF at 25°C 0.000 0.000 %
PF at 100°C 1.180 1.450 %
Acid number 0.012 0.012 0.012 0.010 mg KOH/g
Interfacial tension 31.6 33.0 31.4 34.1 mN/m
Specific Gravity 0.8820 0.8800 0.8800 0.8800
Color 2.0 2.0 2.0 2.0
Oil quality index 0.4 0.4 0.4 0.3
Visual CLEAR CLEAR CLEAR CLEAR
Corrosive Sulfur D1275B Noncorrosive
Fluid quality retest days 365 365 365 365 days
Fluid quality retest date 2024-09-17 2022-08-04 2022-07-26 2021-12-07
FQ result 1 1 1 1
Fluid Quality Analysis Remarks
No oil quality problems were detected.
Furans / Alcohols
Lab report number 224586-001 224426-001 150203-017 136966-006
Sample date 2021-08-04 2021-07-26 2008-10-29 2006-05-01
Sample temp 27 35 40 °C
2-furfural (2FAL) 0 0 0 0 µg/L
Furan result 1 1 1 1
Furan Analysis Remarks
Furan levels are within acceptable limits.
7 Report generated from GRU at 20260127T020114Z
PCB Analysis
Lab report number 192008-002 152796-002 150203-017 136966-006
Sample date 2016-01-19 2009-05-12 2008-10-29 2006-05-01
Sample temp 35 45 35 40 °C
Total PCB 7.0 7.0 7.0 6.0 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=DHT62&serialnum=7001633&apprtype=TRN&tank=MAIN
8 Report generated from GRU at 20260127T020114Z
1999 2004 2009 2014 2019 2024 2029 0.0
0.5
1.0
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 0.0
1.0
2.0
3.0
Acetylene (C2H2) µL /L
1999 2004 2009 2014 2019 2024 2029
Carbon Monoxide (CO) µL /L
9 Report generated from GRU at 20260127T020114Z
1999 2004 2009 2014 2019 2024 2029
Carbon Dioxide (CO2) µL /L
1999 2004 2009 2014 2019 2024 2029
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
0.1
0.2
0.3
0.4 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 20260127T020114Z
1999 2004 2009 2014 2019 2024 2029
Predicted composite fault gas µL /L
1999 2004 2009 2014 2019 2024 2029 0.0
0.2
0.4
0.6
0.8
1.0 Acetylene/Hydrogen (C2H2/H2)
1999 2004 2009 2014 2019 2024 2029
CO2/CO
1999 2004 2009 2014 2019 2024 2029 0.00
0.05
0.10
0.15
0.20
CO/CO2
1999 2004 2009 2014 2019 2024 2029 0.00
0.02
0.04
0.06
0.08
Oxygen/Nitrogen (O2/N2)
1999 2004 2009 2014 2019 2024 2029 0.00
0.02
0.04
0.06
ETCG/ESHL
2006 2011 2016 2021 2026
Diel breakdown D877 kV
2006 2011 2016 2021 2026
-0.4
-0.2
0.0
0.2
0.4
PF at 25°C
11 Report generated from GRU at 20260127T020114Z
2006 2011 2016 2021 2026 0.0
0.5
1.0
1.5 PF at 100°C
2006 2011 2016 2021 2026 0.00
0.05
0.10
0.15
0.20
Acid number m g
KO
H
/g 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
2.5 Color
2006 2011 2016 2021 2026 0.00
0.10
0.20
0.30
Oil quality index
2001 2006 2011 2016 2021 2026 2031
Moisture (H2O) m g/ kg
2001 2006 2011 2016 2021 2026 2031
Relative saturation
12 Report generated from GRU at 20260127T020114Z
2006 2011 2016 2021 2026
2-furfural (2FAL) µg /L
1999 2004 2009 2014 2019 2024 2029
Sample temp
°C 2018 2020 2022 2024 2026 2028
0.0
0.5
1.0
1.5
2.0 HF %/yr combined
Raw Data Upper alert limit Lower alert limit
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