Transformer Lifecycle Services. Container Id: Miscellaneous Id: Second Name: Sequence #:

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1 Report # Sample # 1 Transformer Lifecycle Services Received 08/09/2016 Date August 10, 2016 Serial Number: Substation Name: Colorado Bend Design Type: Core Type Manufacturer: HicoA MFR.Year: 2016 Equipment Number: GSU4001 Preservation System: Transformer Name: GSU4001 Transformer Type: Transformer Maximum kv: 350 Container Id: Miscellaneous Id: Second Name: Sample Point: Main Tank Bottom Sequence #: Phase: Ambient Temp C: 28 Humidity: 75 Top Oil Temp C: 30 Peak Temp C: Cooling System: ONAN/ONAF/ONAF Maximum MVA: 427 Sample Date/By: 8/8/2016 8:30:00 AM ST Fluid Level: Fluid Type: Mineral XFMR Oil Capacity: Gallons Appr Type: XFMR Pressure PSI: LTC MFR./Model: LTC Type: LTC Tank Type : LTC Capacity: Filter LTC: Dissolved Gas Analysis The dissolved gas analysis is run in accordance with ASTM D 3612 and IEC Values are reported in ppm vol/vol at STP and calibrated with gas-in-oil standards. Values before August 15, 2002 are reported at NTP and calibrated with gas standards. Top Oil Hydrogen Oxygen Nitrogen Methane Carbon Monox. Ethane Carbon Dioxide Ethylene Acetylene EST TCG C2H4/ Comb Gas Report # Sample DateTemp C (H2) (O2) (N2) (CH4) (CO) (C2H6) (CO2) (C2H4) (C2H2) Total Gas COMB GAS % C2H2 Rate ppm/day /08/ /11/ /30/ Oil Quality Tests Specific Report # Top Oil Water Relative Sample DateTemp C ContentSaturation Color Diel D877 1mm D1816- D1816-2mm Interfacial Tension Neut. No. Pour Pt PF25C PF 100C Gravity (Rel. Specific Gravity By Viscosity Density) D 40 C Visual ppm % kv kv kv mn/m mgkoh/g C % % 60/60 60/60 mm2/s (cst) D1533 IEC D1500 D877 D1816 D1816 D971 ISO 6295 D974 D97 ISO 3016 D924 D924 D1298 D4052 D445 ISO 3104 D /08/ /11/ L < /30/ L < Clear & Bright- Few Particles Clear & Bright-Fine Particles Clear & Bright-Fine Particles

2 EXCEPTIONS NOTED _X2 Report Source Session Test Date TwoWindingTransformer 7/2/ :38:46 AM Nameplate - Two-winding Transformer Company HICO America Serial Number Location Colorado Bend II Special ID T-333 Division TLS Circuit Designation GSU-0004 Manufacturer Hyosung Industrial., LTD Configuration Y-fi Year Manufactured 2016 Tank Type Sealed Conservation Mfr Location Korea Coolant Oil Phases Three Class ONAN/ONAF/ONAF Oil Volume IG BIL 1175 kv Weight LB kv 350, 25 VA Rating 252, 335, 421, *, MVA Administration Test Date 7/2/2016 Test Time: 11:38 AM Weather Sunny Air Temperature 26 C Apparatus Temperature 31 C Humidity 70 % Tester Work Order Date Last Tested Verified Test Set Type M4000 Date Retested Verification Date Set Top Serial # Reason INITIAL NEW Last Sheet # Set Bottom Serial # Travel Time Purchase Order Ins. Book # Duration Copies Sheet # Crew Size Arrester Nameplate Location Serial # Manufacturer Overall Catalog Unit Catalog Type Rated kv Order H1-BOTTOM T BOTTOM Ohio Brass SVN276GA SVN 276 BOTTOM H1 TOP T TOP Ohio Brass SVN276GA SVN 276 TOP H2 BOTTOM T BOTTOM Ohio Brass SVN276GA SVN 276 BOTTOM H2-TOP T TOP Ohio Brass SVN276GA SVN 276 TOP H3-BOTTOM T BOTTOM Ohio Brass SVN276GA SVN 276 BOTTOM H3-TOP T TOP Ohio Brass SVN276GA SVN 276 TOP Bushing Nameplate Designation Serial # Manufacturer Type C1 %PF C1 Cap C2 %PF C2 Cap Rated kv Amps H PCORE Electric Co. POC * * H PCORE Electric Co. POC H PCORE Electric Co. POC H PCORE Electric Co. POC X X X Electro Composites Inc. Electro Composites Inc. Electro Composites Inc

3 Overall Tests EXCEPTIONS NOTED Insulation Test kv ma Watts % PF Corr. Corr Fctr Cap (pf) FRANK 谀 Manual 1 CH+CHL Good 2 CH Good Good 3 CHL(UST) Good Good 4 CHL Good 5 CL+CHL Good 6 CL Good Good 7 CHL(UST) Good 8 CHL Good Good Bushing C1 ID Serial # NP %PF NP Cap Test kv ma Watts % PF Corr. Corr Fctr Cap(pF) FRANK 谀 Manual H Good Good H Good Good H Good Good H Good Good X X X Deteriorated Good Good Good Deteriorated Good Note X1-X2-X3 are Electro Composite Bushings Tested on / External Temp: 36C - Power factor for all three bushings was 1.1 Tested on / External Temp: 26C - Power Factors were 0.9 After reviewing the ECI bushing manual, on page 8 there is a paragraph that says discrepancies between the measured values and the indicated values on the nameplate can occur since namplate values are obtained under a controlled conditions at the factory the conditons at job site high heat and humidity. Bushing C2 ID Serial # NP %PF NP Cap Test kv ma Watts % PF Corr. Corr Fctr Cap(pF) FRANK 谀 Manual H * * Good Good H Good Good H Good Good H Good Good X X X Investigate Good Investigate Good Investigate Good

4 Surge Arrester Tests EXCEPTIONS NOTED Location Test Mode Test kv ma Watts FRANK 谀 Manual H1-BOTTOM GND RB Good Good H1 TOP GND RB Good Good H2 BOTTOM GND RB Good Good H2-TOP GND RB Good Good H3-BOTTOM GND RB Good Good H3-TOP GND RB Good Good H1-BOTTOM GND RB Good Good H1 TOP UST RB Good Good H2 BOTTOM GND RB Good Good H2-TOP UST RB Good Good H3-BOTTOM GND RB Good Good H3-TOP UST RB Good Good Exciting Current Tests H1 H0 H2 H0 H3 H0 DETC LTC Test kv ma Watts X ma Watts X ma Watts X FRANK 谀 Manual L L L Good Good L L L Good Good L L L Good Good L L L Good Good L L L Good Good Turns Ratio Tests Serial Number HV Winding LV Winding Wye Delta Connections H1 - H0 H2 - H0 H3 - H0 X1 - X3 X2 - X1 X3 - X2 Tap NP Volt Tap NP Volt Cal Ratio 1 Ratio 2 Ratio 3 Min. Lim Max. Lim FRANK 谀 Manual NA Good Good NA Good Good NA Good Good NA Good Good NA Good Good

5 EXCEPTIONS NOTED After CT Replacement Report Source Session Test Date TwoWindingTransformer 8/8/2016 2:37:26 PM Administration Test Date 8/8/2016 Test Time: 2:37 PM Weather Sunny Air Temperature 34 C Apparatus Temperature 34 C Humidity 41 % Tester Work Order Date Last Tested 7/2/2016 Verified Test Set Type M4000 Date Retested Verification Date Set Top Serial # Reason ACCEPTANCE Last Sheet # Set Bottom Serial # Travel Time Purchase Order Ins. Book # Duration Copies Sheet # Crew Size Overall Tests Insulation Test kv ma Watts % PF Corr. Corr Fctr Cap (pf) FRANK 谀 Manual 1 CH+CHL Good 2 CH Good Good 3 CHL(UST) Good Good 4 CHL Good 5 CL+CHL Good 6 CL Good Good 7 CHL(UST) Good 8 CHL Good Good Bushing C1 ID Serial # NP %PF NP Cap Test kv ma Watts % PF Corr. Corr Fctr Cap(pF) FRANK 谀 Manual H Investigate Good H Good Good H Good Good H Good Good X X X Investigate Good Investigate Good Investigate Good Bushing C2 ID Serial # NP %PF NP Cap Test kv ma Watts % PF Corr. Corr Fctr Cap(pF) FRANK 谀 Manual H * * Good Good H Good Good H Good Good H Good Good X X Investigate Good Investigate Good X Investigate Good

6 Exciting Current Tests EXCEPTIONS NOTED H1 H0 H2 H0 H3 H0 DETC LTC Test kv ma Watts X ma Watts X ma Watts X FRANK 谀 Manual L L L Good Good L L L Good Good L L L Good Good L L L Good Good L L L Good Good

7 EXCEPTIONS NOTED TRANSFORMER LIFECYCLE SERVICES,LLC PO BOX ; ALTAMONTE SPRINGS, FL PHONE: NAS 8707 FAX: INSULATION RESISTANCE WINDING CONFIGURATION: HV XV YV WINDING TEMPERATURE ( C) HV 32 XV 32 N/A WINDINGS GROUND TIME TEST kv TEST SPECIMEN MEASUREMENT 20 C 60 Seconds 1 HV GND MΩ MΩ 60 Seconds 1 XV GND 9500 MΩ 9961 MΩ WINDING WINDING TIME TEST kv TEST SPECIMEN MEASUREMENT 20 C 60 Seconds 1 HV XV MΩ MΩ CORE GROUND TIME TEST kv TEST SPECIMEN MEASUREMENT 20 C 60 Seconds 0.5 CORE GND 5600 MΩ 5872 MΩ 60 Seconds 0.5 FRAME GND 3100 MΩ 3250 MΩ 60 Seconds 0.5 CORE FRAME 3200 MΩ 3355 MΩ

8 EXCEPTIONS NOTED TRANSFORMER LIFECYCLE SERVICES,LLC PO BOX ; ALTAMONTE SPRINGS, FL PHONE: NAS 8707 FAX: WINDING RESISTANCE FOR 85 C CONVERSION WINDING CONFIGURATION: HV XV YV WINDING DESIGNATION: WINDING TEMPERATURE ( C): HIGH VOLTAGE A PHASE WINDING TEMPERATURE ( C) B PHASE WINDING TEMPERATURE ( C) C PHASE WINDING TEMPERATURE ( C) A PHASE H1 HO B PHASE H2 HO C PHASE H3 HO DETC Tap LTC Tap TEST CURRENT MEASUREMENT 85 Correction MSD In: MEASUREMENT 85 Correction MSD In: MEASUREMENT 85 Correction MSD In: NA mω mω mω WINDING DESIGNATION: WINDING TEMPERATURE ( C): LOW VOLTAGE A PHASE WINDING TEMPERATURE ( C) B PHASE WINDING TEMPERATURE ( C) C PHASE WINDING TEMPERATURE ( C) A PHASE X1 X3 B PHASE X2 X1 C PHASE X3 X2 DETC Tap LTC Tap TEST CURRENT MEASUREMENT 85 Correction MSD In: MEASUREMENT 85 Correction MSD In: MEASUREMENT 85 Correction MSD In: NA NA mω mω mω

9 EXCEPTIONS NOTED HV Open Circuit (Tap 3) Sweep Frequency Response Analyzer Test Report

10 EXCEPTIONS NOTED HV OPEN CIRCUIT FACTORY OVERLAP Sweep Frequency Response Analyzer Test Report

11 EXCEPTIONS NOTED HV Short Circuit (XV) (Tap 3) Sweep Frequency Response Analyzer Test Report

12 EXCEPTIONS NOTED HV SHORT CIRCUIT (XV) FACTORY OVERLAP Sweep Frequency Response Analyzer Test Report

13 EXCEPTIONS NOTED XV Open Circuit (Tap 3) Sweep Frequency Response Analyzer Test Report

14 EXCEPTIONS NOTED XV OPEN CIRCUIT FACTORY OVERLAP Sweep Frequency Response Analyzer Test Report

15 EXCEPTIONS NOTED HV OPEN CIRCUIT (Tap 2) Sweep Frequency Response Analyzer Test Report

16 EXCEPTIONS NOTED HV SHORT CIRCUIT (XV) (Tap 2) Sweep Frequency Response Analyzer Test Report

17 EXCEPTIONS NOTED XV OPEN CIRCUIT (Tap 2) Sweep Frequency Response Analyzer Test Report

18 SECTION II CurrentTransformer TestResults TLS Work Order #: T 333 / T 377

19 FILENAME: H0-C16.test DATE: 08/08/16 14:20:48 COMPANY: TLS STATION: COLORADO BEND II CIRCUIT: HV MFR: HICO MODEL: SN: OPERATOR: COMMENTS: SUMMARY REPORT KNEE TYPE: IEEE 30 Deg FREQUENCY: 60 Hz Test Tap IEEE30(V/I) IEEE45(V/I) IEC 10/50(V/I) NP-Ratio M-Ratio % Error Phase Angle Winding Res 1 X1-X / / / / % 0.02 [In Ø] N/A 2 X1-X / / / / % 0.06 [In Ø] N/A 3 X1-X / / / / % [In Ø] N/A 4 X1-X / / / / % 0.08 [In Ø] N/A Test Notepad V CT Excitation Plot 2000 V 1000 V 100 V 10 V 1 V.001 A.01 A 0.1 A 1.0 A 10 A

20 FILENAME: H0-C17.test DATE: 08/08/16 14:27:59 COMPANY: TLS STATION: COLORADO BEND II CIRCUIT: HV MFR: HICO MODEL: SN: OPERATOR: COMMENTS: SUMMARY REPORT KNEE TYPE: IEEE 30 Deg FREQUENCY: 60 Hz Test Tap IEEE30(V/I) IEEE45(V/I) IEC 10/50(V/I) NP-Ratio M-Ratio % Error Phase Angle Winding Res 1 X1-X / / / / % [In Ø] N/A 2 X1-X / / / / % [In Ø] N/A 3 X1-X / / / / % 0.10 [In Ø] N/A 4 X1-X / / / / % 0.10 [In Ø] N/A Test Notepad V CT Excitation Plot 2000 V 1000 V 100 V 10 V 1 V.001 A.01 A 0.1 A 1.0 A 10 A

21 FILENAME: H1-C1.test DATE: 08/08/16 11:58:25 COMPANY: TLS STATION: COLORADO BEND II CIRCUIT: H1-C1 MFR: HICO MODEL: GSU-0004 SN: OPERATOR: DE COMMENTS: SUMMARY REPORT KNEE TYPE: IEEE 30 Deg FREQUENCY: 60 Hz Test Tap IEEE30(V/I) IEEE45(V/I) IEC 10/50(V/I) NP-Ratio M-Ratio % Error Phase Angle Winding Res 1 X1-X / / / / % 0.04 [In Ø] N/A 2 X1-X / / / / % 0.04 [In Ø] N/A 3 X1-X / / / / % 0.02 [In Ø] N/A 4 X1-X / / / / % 0.04 [In Ø] N/A Test Notepad V CT Excitation Plot 2000 V 1000 V 100 V 10 V 1 V.001 A.01 A 0.1 A 1.0 A 10 A

22 FILENAME: H1-C4.test DATE: 08/08/16 12:09:29 COMPANY: TLS STATION: COLORADO BEND II CIRCUIT: HV MFR: HICO MODEL: GSU-0004 SN: OPERATOR: DE COMMENTS: SUMMARY REPORT KNEE TYPE: IEEE 30 Deg FREQUENCY: 60 Hz Test Tap IEEE30(V/I) IEEE45(V/I) IEC 10/50(V/I) NP-Ratio M-Ratio % Error Phase Angle Winding Res 1 X1-X2 0.00/ / / / % [In Ø] N/A 2 X1-X / / / / % 0.04 [In Ø] N/A 3 X1-X / / / / % 0.00 [In Ø] N/A 4 X1-X / / / / % 0.02 [In Ø] N/A Test Notepad V CT Excitation Plot 2000 V 1000 V 100 V 10 V 1 V.001 A.01 A 0.1 A 1.0 A 10 A

23 FILENAME: H1-C7.test DATE: 08/08/16 12:28:04 COMPANY: TLS STATION: COLORADO BEND II CIRCUIT: HV MFR: HICO MODEL: SN: OPERATOR: COMMENTS: SUMMARY REPORT KNEE TYPE: IEEE 30 Deg FREQUENCY: 60 Hz Test Tap IEEE30(V/I) IEEE45(V/I) IEC 10/50(V/I) NP-Ratio M-Ratio % Error Phase Angle Winding Res 1 X1-X / / / / % 0.02 [In Ø] N/A 2 X1-X / / / / % 0.04 [In Ø] N/A 3 X1-X / / / / % 0.02 [In Ø] N/A 4 X1-X / / / / % [In Ø] N/A Test Notepad V CT Excitation Plot 2000 V 1000 V 100 V 10 V 1 V.001 A.01 A 0.1 A 1.0 A 10 A

24 FILENAME: H1-C10.test DATE: 08/08/16 12:36:42 COMPANY: TLS STATION: COLORADO BEND II CIRCUIT: HV MFR: HICO MODEL: SN: OPERATOR: COMMENTS: SUMMARY REPORT KNEE TYPE: IEEE 30 Deg FREQUENCY: 60 Hz Test Tap IEEE30(V/I) IEEE45(V/I) IEC 10/50(V/I) NP-Ratio M-Ratio % Error Phase Angle Winding Res 1 X1-X / / / / % 0.02 [In Ø] N/A 2 X1-X / / / / % 0.02 [In Ø] N/A 3 X1-X / / / / % 0.00 [In Ø] N/A 4 X1-X / / / / % 0.00 [In Ø] N/A Test Notepad V CT Excitation Plot 2000 V 1000 V 100 V 10 V 1 V.001 A.01 A 0.1 A 1.0 A 10 A

25 FILENAME: H2-C2.test DATE: 08/08/16 12:51:50 COMPANY: TLS STATION: COLORADO BEND II CIRCUIT: HV MFR: HICO MODEL: SN: OPERATOR: COMMENTS: SUMMARY REPORT KNEE TYPE: IEEE 30 Deg FREQUENCY: 60 Hz Test Tap IEEE30(V/I) IEEE45(V/I) IEC 10/50(V/I) NP-Ratio M-Ratio % Error Phase Angle Winding Res 1 X1-X2 0.00/ / / / % [In Ø] N/A 2 X1-X / / / / % 0.06 [In Ø] N/A 3 X1-X / / / / % 0.04 [In Ø] N/A 4 X1-X / / / / % 0.08 [In Ø] N/A Test Notepad V CT Excitation Plot 2000 V 1000 V 100 V 10 V 1 V.001 A.01 A 0.1 A 1.0 A 10 A

26 FILENAME: H2-C5.test DATE: 08/08/16 13:00:06 COMPANY: TLS STATION: COLORADO BEND II CIRCUIT: HV MFR: HICO MODEL: SN: OPERATOR: COMMENTS: SUMMARY REPORT KNEE TYPE: IEEE 30 Deg FREQUENCY: 60 Hz Test Tap IEEE30(V/I) IEEE45(V/I) IEC 10/50(V/I) NP-Ratio M-Ratio % Error Phase Angle Winding Res 1 X1-X / / / / % 0.00 [In Ø] N/A 2 X1-X / / / / % 0.06 [In Ø] N/A 3 X1-X / / / / % 0.04 [In Ø] N/A 4 X1-X / / / / % 0.08 [In Ø] N/A Test Notepad V CT Excitation Plot 2000 V 1000 V 100 V 10 V 1 V.001 A.01 A 0.1 A 1.0 A 10 A

27 FILENAME: H2-C8.test DATE: 08/08/16 13:07:18 COMPANY: TLS STATION: COLORADO BEND II CIRCUIT: HV MFR: HICO MODEL: SN: OPERATOR: COMMENTS: SUMMARY REPORT KNEE TYPE: IEEE 30 Deg FREQUENCY: 60 Hz Test Tap IEEE30(V/I) IEEE45(V/I) IEC 10/50(V/I) NP-Ratio M-Ratio % Error Phase Angle Winding Res 1 X1-X / / / / % 0.00 [In Ø] N/A 2 X1-X / / / / % 0.06 [In Ø] N/A 3 X1-X / / / / % 0.04 [In Ø] N/A 4 X1-X / / / / % 0.08 [In Ø] N/A Test Notepad V CT Excitation Plot 2000 V 1000 V 100 V 10 V 1 V.001 A.01 A 0.1 A 1.0 A 10 A ZII Document Control TR Jan 26, 2017

28 FILENAME: H2-C11.test DATE: 08/08/16 13:14:53 COMPANY: TLS STATION: COLORADO BEND II CIRCUIT: HV MFR: HICO MODEL: SN: OPERATOR: COMMENTS: SUMMARY REPORT KNEE TYPE: IEEE 30 Deg FREQUENCY: 60 Hz Test Tap IEEE30(V/I) IEEE45(V/I) IEC 10/50(V/I) NP-Ratio M-Ratio % Error Phase Angle Winding Res 1 X1-X2 0.00/ / / / % [In Ø] N/A 2 X1-X / / / / % 0.06 [In Ø] N/A 3 X1-X / / / / % 0.04 [In Ø] N/A 4 X1-X / / / / % 0.08 [In Ø] N/A Test Notepad V CT Excitation Plot 2000 V 1000 V 100 V 10 V 1 V.001 A.01 A 0.1 A 1.0 A 10 A

29 FILENAME: H2-C18.test DATE: 08/08/16 13:25:25 COMPANY: TLS STATION: COLORADO BEND II CIRCUIT: HV MFR: HICO MODEL: GSU-0004 SN: OPERATOR: COMMENTS: SUMMARY REPORT KNEE TYPE: IEEE 30 Deg FREQUENCY: 60 Hz Test Tap IEEE30(V/I) IEEE45(V/I) IEC 10/50(V/I) NP-Ratio M-Ratio % Error Phase Angle Winding Res 1 X1-X / / / / % 0.00 [In Ø] N/A Test Notepad V CT Excitation Plot 2000 V 1000 V 100 V 10 V 1 V.001 A.01 A 0.1 A 1.0 A 10 A

30 FILENAME: H3-C3.test DATE: 08/08/16 13:50:17 COMPANY: TLS STATION: COLORADO BEND II CIRCUIT: HV MFR: HICO MODEL: SN: OPERATOR: COMMENTS: SUMMARY REPORT KNEE TYPE: IEEE 30 Deg FREQUENCY: 60 Hz Test Tap IEEE30(V/I) IEEE45(V/I) IEC 10/50(V/I) NP-Ratio M-Ratio % Error Phase Angle Winding Res 1 X1-X / / / / % 0.00 [In Ø] N/A 2 X1-X / / / / % 0.06 [In Ø] N/A 3 X1-X / / / / % 0.04 [In Ø] N/A 4 X1-X / / / / % 0.06 [In Ø] N/A Test Notepad V CT Excitation Plot 2000 V 1000 V 100 V 10 V 1 V.001 A.01 A 0.1 A 1.0 A 10 A

31 FILENAME: H3-C6.test DATE: 08/08/16 13:50:17 COMPANY: TLS STATION: COLORADO BEND II CIRCUIT: HV MFR: HICO MODEL: SN: OPERATOR: COMMENTS: SUMMARY REPORT KNEE TYPE: IEEE 30 Deg FREQUENCY: 60 Hz Test Tap IEEE30(V/I) IEEE45(V/I) IEC 10/50(V/I) NP-Ratio M-Ratio % Error Phase Angle Winding Res 1 X1-X / / / / % 0.00 [In Ø] N/A 2 X1-X / / / / % 0.06 [In Ø] N/A 3 X1-X / / / / % 0.04 [In Ø] N/A 4 X1-X / / / / % 0.06 [In Ø] N/A Test Notepad V CT Excitation Plot 2000 V 1000 V 100 V 10 V 1 V.001 A.01 A 0.1 A 1.0 A 10 A

32 FILENAME: H3-C9.test DATE: 08/08/16 14:01:05 COMPANY: TLS STATION: COLORADO BEND II CIRCUIT: HV MFR: HICO MODEL: SN: OPERATOR: COMMENTS: SUMMARY REPORT KNEE TYPE: IEEE 30 Deg FREQUENCY: 60 Hz Test Tap IEEE30(V/I) IEEE45(V/I) IEC 10/50(V/I) NP-Ratio M-Ratio % Error Phase Angle Winding Res 1 X1-X / / / / % 0.00 [In Ø] N/A 2 X1-X / / / / % 0.06 [In Ø] N/A 3 X1-X / / / / % 0.04 [In Ø] N/A 4 X1-X / / / / % 0.08 [In Ø] N/A Test Notepad V CT Excitation Plot 2000 V 1000 V 100 V 10 V 1 V.001 A.01 A 0.1 A 1.0 A 10 A

33 FILENAME: H3-C12.test DATE: 08/08/16 14:09:24 COMPANY: TLS STATION: COLORADO BEND II CIRCUIT: HV MFR: HICO MODEL: SN: OPERATOR: COMMENTS: SUMMARY REPORT KNEE TYPE: IEEE 30 Deg FREQUENCY: 60 Hz Test Tap IEEE30(V/I) IEEE45(V/I) IEC 10/50(V/I) NP-Ratio M-Ratio % Error Phase Angle Winding Res 1 X1-X2 0.00/ / / / % [In Ø] N/A 2 X1-X / / / / % 0.06 [In Ø] N/A 3 X1-X / / / / % 0.04 [In Ø] N/A 4 X1-X / / / / % 0.06 [In Ø] N/A Test Notepad V CT Excitation Plot 2000 V 1000 V 100 V 10 V 1 V.001 A.01 A 0.1 A 1.0 A 10 A EZCT-2000 Software Version:

34 FILENAME: X1-C13.test DATE: 08/08/16 14:53:40 COMPANY: TLS STATION: COLORADO BEND II CIRCUIT: XV MFR: HICO MODEL: GSU-0004 SN: OPERATOR: COMMENTS: SUMMARY REPORT KNEE TYPE: IEEE 30 Deg FREQUENCY: 60 Hz Test Tap IEEE30(V/I) IEEE45(V/I) IEC 10/50(V/I) NP-Ratio M-Ratio % Error Phase Angle Winding Res 1 X1-X / / / / % 0.22 [In Ø] N/A 2 X1-X / / / / % 0.06 [In Ø] N/A 3 X1-X / / / / % 0.12 [In Ø] N/A 4 X1-X / / / / % 0.10 [In Ø] N/A Test Notepad V CT Excitation Plot 2000 V 1000 V 100 V 10 V 1 V.001 A.01 A 0.1 A 1.0 A 10 A EZCT-2000 Software Version:

35 FILENAME: X2-C14.test DATE: 08/08/16 15:00:50 COMPANY: TLS STATION: COLORADO BEND II CIRCUIT: XV MFR: HICO MODEL: GSU-0004 SN: OPERATOR: COMMENTS: SUMMARY REPORT KNEE TYPE: IEEE 30 Deg FREQUENCY: 60 Hz Test Tap IEEE30(V/I) IEEE45(V/I) IEC 10/50(V/I) NP-Ratio M-Ratio % Error Phase Angle Winding Res 1 X1-X / / / / % 0.42 [In Ø] N/A 2 X1-X / / / / % [In Ø] N/A 3 X1-X / / / / % 0.38 [In Ø] N/A 4 X1-X / / / / % 0.28 [In Ø] N/A Test Notepad V CT Excitation Plot 2000 V 1000 V 100 V 10 V 1 V.001 A.01 A 0.1 A 1.0 A 10 A EZCT-2000 Software Version:

36 FILENAME: X2-C19.test DATE: 08/08/16 15:12:26 COMPANY: TLS STATION: COLORADO BEND II CIRCUIT: XV MFR: HICO MODEL: GSU-0004 SN: OPERATOR: COMMENTS: SUMMARY REPORT KNEE TYPE: IEEE 30 Deg FREQUENCY: 60 Hz Test Tap IEEE30(V/I) IEEE45(V/I) IEC 10/50(V/I) NP-Ratio M-Ratio % Error Phase Angle Winding Res 1 X1-X / / / / % 0.12 [In Ø] N/A Test Notepad V CT Excitation Plot 2000 V 1000 V 100 V 10 V 1 V.001 A.01 A 0.1 A 1.0 A 10 A EZCT-2000 Software Version:

37 FILENAME: X3-C15.test DATE: 08/08/16 15:20:37 COMPANY: TLS STATION: COLORADO BEND II CIRCUIT: XV MFR: HICO MODEL: GSU-0004 SN: OPERATOR: COMMENTS: SUMMARY REPORT KNEE TYPE: IEEE 30 Deg FREQUENCY: 60 Hz Test Tap IEEE30(V/I) IEEE45(V/I) IEC 10/50(V/I) NP-Ratio M-Ratio % Error Phase Angle Winding Res 1 X1-X / / / / % 0.22 [In Ø] N/A 2 X1-X / / / / % 0.10 [In Ø] N/A 3 X1-X / / / / % 0.08 [In Ø] N/A 4 X1-X / / / / % 0.06 [In Ø] N/A Test Notepad V CT Excitation Plot 2000 V 1000 V 100 V 10 V 1 V.001 A.01 A 0.1 A 1.0 A 10 A EZCT-2000 Software Version:

38 SECTION III Oil Processing Logs TLS Work Order #: T 333 / T 377

39 T-377 Transformer GSU#4 Serial Number Start Date 8/5/2016 Additional Information Vacuum oil fill after CT replacement Date Time Ambient Temp. Rel. Humidity mmhg Xformer Vacuum mmhg Purifier Gallons per Minute Transformer Oil Temp. into Unit Temp. out of Unit 8/5/2016 5:00PM 33 C 59% 710 T 710T N/A N/A N/A 8/5/2016 6:00PM 35 C 51% N/A N/A N/A 8/5/2016 7:00PM 34 C 58% N/A N/A N/A 8/5/2016 8:00PM 32 C 63% N/A N/A N/A 8/5/2016 9:00PM 31 C 68% N/A N/A N/A 8/5/ :00PM 30 C 71% N/A N/A N/A 8/5/ :00PM 29 C 76% N/A N/A N/A 8/6/ :00AM 28 C 79% N/A N/A N/A 8/6/2016 1:00AM 28 C 81% N/A N/A N/A 8/6/2016 2:00AM 27 C 84% N/A N/A N/A 8/6/2016 3:00AM 27 C 84% N/A N/A N/A 8/6/2016 4:00AM 27 C 85% N/A N/A N/A 8/6/2016 5:00AM 27 C 85% N/A N/A N/A 8/6/2016 6:00AM 26 C 88% N/A N/A N/A 8/6/2016 7:00AM 26 C 88% N/A N/A N/A 8/6/2016 8:00AM 27 C 86% N/A N/A N/A 8/6/2016 9:00AM 29 C 81% N/A N/A N/A 8/6/ :00AM 31 C 71% N/A N/A N/A 8/6/ :00AM 34 C 59% N/A N/A N/A 8/6/ :00PM 35 C 51% N/A N/A N/A 8/6/2016 1:00PM 37 C 50% N/A N/A N/A Comments Startfinal vacuum Below.500

40 T-377 Transformer GSU#4 Serial Number Start Date 8/5/2016 Date Time Ambient Temp. Rel. Humidity mmhg Unit Vacuum mmhg Equipment Gallons per Minute Transformer Oil Temp. into Unit Temp. out of Unit 8/6/2016 2:00PM 38 C 42% N/A N/A N/A 8/6/2016 3:00PM 38 C 41% N/A N/A N/A 8/6/2016 4:00PM 38 C 41% N/A N/A N/A 8/6/2016 5:00PM 37 C 42% N/A N/A N/A Comments 8/6/2016 6:00PM 36 C 44% C 65 C Startfinal oil fill 8/6/2016 7:00PM 34 C 51% C 65 C 1,200 gallons 8/6/2016 8:00PM 33 C 64% C 65 C 3,115 gallons 8/6/2016 9:00PM 31 C 68% C 65 C 4,010 gallons 8/6/ :00PM 29 C 77% C 65 C 5,980 gallons 8/6/ :00PM 29 C 77% C 65 C 7,551 gallons 8/7/ :00AM 28 C 81% C 65 C 8,325 gallons 8/7/2016 1:00AM 28 C 84% C 65 C 9,556 gallons 8/7/2016 2:00AM 28 C 85% C 65 C 11,316 gallons 8/7/2016 3:00AM 27 C 87% C 65 C 12,775 gallons 8/7/2016 4:00AM 27 C 87% C 65 C 14,496 gallons 8/7/2016 5:00AM 26 C 87% N/A N/A N/A N/A N/A 8/7/2016 6:00AM 26 C 88% N/A C 65 C 16,080 top off 8/7/2016 7:00AM 26 C 89% N/A C 65 C 735 gallons Startre-circulation 8/7/2016 8:00AM 29 C 83% N/A C 65 C 2,860 gallons 8/7/2016 9:00AM 30 C 80% N/A C 65 C 4,002 gallons 8/7/ :00AM 31 C 72% N/A C 65 C Breaking vacuum 5,648 gallons

41 EXCEPTIONS NOTED T-377 Transformer GSU#4 Serial Number Start Date 8/5/2016 Date Time Ambient Temp. Rel. Humidity mmhg Unit Vacuum mmhg Equipment Gallons per Minute Transformer Oil Temp. into Unit Temp. out of Unit Comments 8/7/ :00AM 34 C 57% N/A C 65 C 7,400 gallons 8/7/ :00PM 35 C 53% N/A C 65 C 8,863 gallons 8/7/2016 1:00PM 37 C 48% N/A C 65 C 10,635 gallons 8/7/2016 2:00PM 37 C 44% N/A C 65 C 11,838 gallons 8/7/2016 3:00PM 37 C 45% N/A C 65 C 13,625 gallons 8/7/2016 4:00PM 36 C 51% N/A C 65 C 15,043 gallons 8/7/2016 5:00PM 38 C 47% N/A C 65 C 16,460 gallons re-circulation complete

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