Transformer Test Report

FORMAT NO.: SPL/TR-02

Shanthala Power LimitedTest Inspection Consultancy Anything Anywhere Anytime

Condition Monitoring Tests onPower TransformersTest Report –2009

Customer:

Kind Attn: Mr.

Ref: Work Order No.:

“Shanthala”, No-24, Priyadarshini Colony, Gokul Road, Hubli - 580 030. Karnataka (India)Phone: +91-0836 - 2332540, 2335936, 2335934,Fax: 0836 – 2334908, Mobile: 94481-34362,

E-mail:[email protected],[email protected]. Website: www.shanthalaindia.com

mailto:[email protected]

http://www.shanthalaindia.com/


SL NO.

INDEXPage Nos.Particulars

SL. NO. Make IDENTIFICATION

01 2698/2 Bharath Bijilee Transformer –No-02 01 of 24

02 4470/1 Bharath Bijilee Transformer –No-01 01 of 21

Ref: SPL/CMT-Off Line/ /2009/ Date: 23/06/2009

To,M/s.

Kind Attn: Mr. Dear Sir,

Sub: Condition Monitoring Tests on Transformers Test ReportRef: Work Order No.: Test Report No.: 073-2/09-10, Dated: 09-05-2009.

Thank you very much for giving us an opportunity to serve you. Please find

enclosed here with the Test Report of Condition Monitoring Tests on Two Nos. of

Transformers,. We have also enclosed Service Bill and the Bill No. is 0282, for

the above work. We request you to settle the same at the earliest.

Kindly arrange to send the “Cheque/DD” in the name of “M/s. Shanthala Power

Limited”, Hubli.

Thanking you.

Yours faithfully,

For Shanthala Power Limited

(Vinoda. N.)Chief Executive Officer

Enclosures:I. Test Report: Three Set

1. Transformers Test Report : 21+24=45 Pages

2. Calibration Certificates : Annexure II Bill1. Service Bill : 02 Page(In Duplicate)2. Service Tax Certificate : 02 Page3. Pan No Certificate : 01 Page

NABL Accredited Laboratory for Transformer Oil Testing (1) BDV (100kV) (2) Water Content(3) Flash Point (4) Tan Delta (5) Resistivity (6) Sludge (7) Acidity (8) IFT (9) DGA (10) Furan

Analysis

SHANTHALA POWER LIMITEDHUBLI-580 030

TEST REPORT NO.073/09-10

FORMAT NO.: SPL/TR-02 Calibration & Test Report Section

PAGE: 01 OF 24

TRANSFORMER-TEST REPORT -1

Test Report No. : 073/09-10 & 17/06/2009

Customer’s Address :

Customer’s Reference : Work Order No.:

Particulars of Equipment Tested : Power Transformer-2

Plant Location : Out Door Substation

Serial No. : 2698/2

Customer Identification : Transformer -2

Make : Bharath Bijilee

Transformer Rating : 15 MVA

Voltage : 132kV/6.9kV

Vector Group : YNyn0

Year of Manufacture : 1985

Phase : 3

Date(s) of Test(s) : 14th to 15th May 2009

Winding Temperature : 450C

Oil Temperature : --

Atmospheric Temperature : ≈450C

Weather Condition : Dry

Particulars of Tests Conducted : Condition Monitoring Tests

Customer’s Requirements : Condition Monitoring Tests

Calibration Certificate s : Annexure

Coordinated By Tested Team

Mr. S. Santhosh Kumar Sr. Engineer (Elect.,)

Mr. M. Rama RajuMr. Vinod N. CEO

Mr. Basavaraj Avali Jr. Test Engineer

Mr. Dyamanna

Prepared By Asst. Manager Analysis

(Gowri M. Patil) Authorised Signatory (Shashikala. V. T)




PAGE: 02 OF 24

MEASUREMENT OF IR V/S TIME TRANSFORMER DETAILS:

Serial No. : 2698/2

Customer Identification : Power Transformer -2

Date of Test : 14th to 15th May 2009

*Average Temperature : ≈450C



TEST RESULTS

SL NO. TIME HV to LV at 5kV HV to GND at 5kV LV to GND at 2.5kV

1 10th Sec 3.0 G 1.8 G 1.5 G2 20th Sec 3.2 G 2.0 G 1.6 G3 30th Sec 3.8 G 2.0 G 1.8 G4 40th Sec 3.9 G 2.0 G 2.0 G5 50th Sec 4.0 G 2.0 G 2.1 G6 01st Min 4.0 G 2.1 G 2.2 G7 02nd Min 4.2 G 2.2 G 2.5 G8 03rd Min 4.5 G 2.2 G 2.5 G9 04th Min 4.5 G 2.2 G 2.5 G

10 05th Min 4.5 G 2.2 G 2.5 G11 06th Min 4.5 G 2.2 G 2.5 G12 07th Min 4.5 G 2.2 G 2.5 G13 08th Min 4.5 G 2.2 G 2.5 G14 09th Min 4.5 G 2.2 G 2.5 G15 10th Min 4.5 G 2.2 G 2.5 G

Note: 1) for test conditions please refer page No. 24 of 24 2) *Average Temperature → (Winding + Atmospheric) =450+450≈450C






PAGE: 03 OF 24

MEASUREMENT OF IR,PI AND ABSORPTION RATIO TRANSFORMER DETAILS:

Serial No. : 2698/2






TEST RESULTS

SL No.

Mode of Test

Voltage (kV)

IR Values in GPI

DC Absorption

Ratio30th Sec 60th Sec 600th Sec

1 HV-LV 5 3.8 4.0 4.5 1.12 1.05

2 HV-GND

5 2.0 2.1 2.2 1.04 1.05

3 LV-GND 2.5 1.8 2.2 2.5 1.13 1.22

Polarization Index Dielectric Absorption Ratio

600 Seconds IR ValuePI = -------------------------------

60 Seconds IR Value

60 Seconds IR ValueDA = -------------------------------

30 Seconds IR Value







PAGE: 04 OF 24

IR Values v/ s Time in (Sec.,) of Transformer, Sl.No.: 2698/ 2

3.84

4.5

2 2.1 2.2

1.8

2.22.5

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

5

1 2 3

Time in Seconds

IR V

alu

es

in G

Ω

HV-LV

HV-GND

LV-GND

30 60 600






PAGE: 05 OF 24

MEASUREMENT OF CAPACITANCE, TAN DELTA AND LEAKAGE CURRENT ON WINDINGS

TRANSFORMER DETAILS:

Serial No. : 2698/2






TEST RESULTS

Mode ofTest

Grounded Winding

Voltage(kV)

Current(mA)

Capacitance(pF) MRXC

Tan Delta(Absolute)

HV-LV(UST)

Nil

2.5 6 4076.74 0.00587

5.0 12 4076.84 0.00520

7.5 20 4076.84 0.00520

10.0 25 4076.84 0.00520

HV-GND(GST) LV

2.5 6 7254.67 0.00660

5.0 12 7255.58 0.00728

7.5 20 7255.58 0.00728

10.0 26 7254.97 0.00728

LV-GND(GST)

HV2.5 2 14170.69 0.00972

5.0 24 14170.69 0.00972







PAGE: 06 OF 24

Voltage v/ s Tan Delta on Transformer, Sl No.: 2698/ 2

0.005870.0052 0.0052 0.0052

0.00660.00728 0.00728 0.00728

0.00972 0.00972

0

0.002

0.004

0.006

0.008

0.01

0.012

1 2 3 4

Voltage in kV

Tan

Del

ta (

Abs

olu

te)

HV-LV

HV-GND

LV-GND

2.5 5 7.5

10






PAGE: 07 OF 24

MEASUREMENT OF CAPACITANCE, TAN DELTA ON HV BUSHINGS TRANSFORMER DETAILS:

Serial No. : 2698/2






TEST RESULTSName Plate Mode of Test Voltage

(kV) Capacitance (pF) Tan Delta (Absolute)

RSl No. 51741Make: CGR/V: 142kVYOM: 1999Current: 800AType: Condenser

HV to BushingTan Delta Point

(UST)

2.5 244.53 0.00669

5.0 244.49 0.00668

7.5 244.49 0.00668

10.0 244.49 0.00668

YSl No. 55976Make: CGR/V: 145kVYOM: 1998Current: 800AType: Condenser

2.5 251.54 0.00552

5.0 251.54 0.00552

7.5 251.54 0.00552

10.0 251.54 0.00552

BSl No. --Make: --R/V: 145kVYOM: --Current: 800AType: Condenser

**Could not be balanced

Note: 1) for test conditions please refer page No. 24 of 24 2) *Average Temperature → (Winding + Atmospheric) =450+450≈450C 3) ** See the pages enclosed along with report and recommendation.






PAGE: 08 OF 24

Voltage v/ s Tan Delta on HV Bushing, Sl No.: 2698/ 2

0.00669 0.00668 0.00668 0.00668

0.00552 0.00552 0.00552 0.00552

0

0.001

0.002

0.003

0.004

0.005

0.006

0.007

0.008

1 2 3 4

Voltage in kV

Tan

Del

ta (

Abs

olu

te)

R

Y

2.5 5 7.5

10






PAGE: 09 OF 24

MEASUREMENT OF DC WINDING RESISTANCE TRANSFORMER DETAILS:

Serial No. : 2698/2






TEST RESULTSOLTC

PositionCurrent (mA) Measurement of DC Winding Resistance in m

Phase (R-N) Phase (Y-N) Phase (B-N)

01 100 4207 3901 3886

02 100 4080 3850 3837

03 100 4040 3804 378904 100 4005 3765 374705 100 3770 3712 370106 100 3640 3660 365707 100 3611 3615 401608 100 3563 3568 358109 100 3516 3522 353710 100 3470 3470 347411 100 3421 3430 342512 100 3378 3380 338613 100 3331 3335 333914 100 3285 3290 328715 100 3235 3238 325916 100 3193 3199 320117 100 3145 3154 3197

Sl No. Current (A)Measurement of Winding Resistance in m(LV Side)

Phase (r-n) Phase (y-n) Phase (b-n)

-- 1 8.3 7.9 8.0







PAGE: 10 OF 24

MEASUREMENT OF HIGH VOLTAGE EXCITATION CURRENT ON HV WINDINGS TRANSFORMER DETAILS:

Serial No. : 2698/2






TEST RESULTSTested Phase Applied Voltage

(kV)Measured Current (mA)

R-N

0.55.0

1.07.0

1.59.0

2.011.0

2.512.0

Y-N

0.54.0

1.0 5.0

1.5 7.0

2.0 8.0

2.5 9.0

B-N

0.5 5.0

1.07.0

1.59.0

2.010.0

2.5 11.0







PAGE: 11 OF 24

MEASUREMENT OF MAGNETIC BALANCE TEST TRANSFORMER DETAILS:

Serial No. : 2698/2






TEST RESULTS

Applied Voltage (V) Measured Voltage (V)

R-N Y-N B-N

226.9 206.5 26.12

Y-N R-N B-N

239.6 106.1 132.2

B-N R-N Y-N

238.1 26.12 218.6







PAGE: 12 OF 24

MEASUREMENT OF MAGNETIZATION CURRENT TRANSFORMER DETAILS:

Serial No. : 2698/2






TEST RESULTS

Tested Phase Measured Voltage (V) Measured Current (mA)

R 397 13.85

Y399 15.93

B 399 15.95







PAGE: 13 OF 24

MEASUREMENT OF NEUTRAL FLOATING POINT TRANSFORMER DETAILS:

Serial No. : 2698/2






TEST RESULTS

Voltage Applied Across HV Side (V) Voltage Measured (V)

R-Y Y-B B-R HV (Neutral)-GND

397 399 399 1.713







PAGE: 14 OF 24

MEASUREMENT OF TRANSFORMER TURN RATIO TRANSFORMER DETAILS:

Serial No. : 2698/2






TEST RESULTS

OLTC Position

Phase

Measurement of Turn Ratio

Meter Reading

(MR)

Correction factor (CF)

Turns Ratio (MRxCF)

Ø Angle of Deviation

01

R 21.16 1.000 21.16 0.02

Y 21.16 1.000 21.16 0.02

B 21.16 1.000 21.16 0.02

02

R 19.88 1.000 19.88 0.08

Y 19.88 1.000 19.88 0.01

B 19.88 1.000 19.88 0.01

03

R 19.64 1.000 19.64 0.01

Y 19.64 1.000 19.64 0.01

B 19.64 1.000 19.64 0.01

04

R 19.24 1.000 19.24 0.08

Y 19.24 1.000 19.24 0.08

B 19.24 1.000 19.24 0.08

05

R 19.12 1.000 19.12 0.04

Y 19.12 1.000 19.12 0.04

B 19.12 1.000 19.12 0.04

06 R 18.90 1.000 18.90 0.08

Y 18.90 1.000 18.90 0.08

B 18.90 1.000 18.90 0.08







PAGE: 15 OF 24


Serial No. : 2698/2






TEST RESULTS

OLTC Position

Phase


Meter Reading

(MR)


Turns Ratio (MRxCF)


07

R 18.68 1.000 18.68 0.08

Y 18.68 1.000 18.68 0.08

B 18.68 1.000 18.68 0.08

08

R 18.46 1.000 18.46 0.08

Y 18.46 1.000 18.46 0.08

B 18.46 1.000 18.46 0.08

09

R 18.12 1.000 18.12 0.08

Y 18.12 1.000 18.12 0.08

B 18.12 1.000 18.12 0.08

10

R 17.90 1.000 17.90 0.08

Y 17.90 1.000 17.90 0.08

B 17.90 1.000 17.90 0.08

11

R 17.60 1.000 17.60 0.06

Y 17.60 1.000 17.60 0.06

B 17.60 1.000 17.60 0.06

12 R 17.42 1.000 17.42 0.06

Y 17.42 1.000 17.42 0.06

B 17.42 1.000 17.42 0.06







PAGE: 16 OF 24


Serial No. : 2698/2






TEST RESULTS

OLTC Position

Phase


Meter Reading

(MR)


Turns Ratio (MRxCF)


13

R 17.22 1.000 17.22 0.06

Y 17.22 1.000 17.22 0.06

B 17.22 1.000 17.22 0.06

14

R 16.84 1.000 16.84 0.06

Y 16.84 1.000 16.84 0.06

B 16.84 1.000 16.84 0.06

15

R 16.70 1.000 16.70 0.06

Y 16.70 1.000 16.70 0.06

B 16.70 1.000 16.70 0.06

16

R 16.50 1.000 16.50 0.06

Y 16.50 1.000 16.50 0.06

B 16.50 1.000 16.50 0.06

17

R 16.28 1.000 16.28 0.06

Y 16.28 1.000 16.28 0.06

B 16.28 1.000 16.28 0.06

Note: 1) for test conditions please refer page No. 24 of 24

2) *Average Temperature → (Winding + Atmospheric) =450+450≈450C






PAGE: 17 OF 24

OIL-TEST REPORT

Test Report No. : 073/09-10 & 17/06/2009

Customer’s Address :

Customer’s Reference : Work Order No.:

Particulars of Sample Tested : Transformer Oil

Date (S) of Test (S) : 27th to 30 May 2009

No. Of Samples Tested : 03 (Three)

Customer’s Requirement : BDV, Moisture Content, Tan Delta, Resistivity, Acidity, IFT, Sludge, Flash Point DGA & Furan Tests.

Whether Tests conducted as per Customer’s Requirement : Yes

Coordinated By Sample Collected By

Mr. S. Santhosh Kumar Sr. Engineer (Elect.,)

Mr. M. Rama RajuMr. Vinod N. CEO

Mr. Basavaraj Avali Jr. Test Engineer

Mr. Dyamanna

Note: 1. The test results relate only to the sample(s) tested.

2. ND-Not Detected.

3. The Limits for DGA is valid from last date of filtration.

4. If the last date of filtration is not specified the limits for DGA is considered from the Year of

Installation.

5. Any Anomaly / Discrepancy in this test report / certificate should be brought to our notice

within 60 days from the date of issue.

6. The Test Report Not to be reproduced except in full, without written approval from the laboratory.






PAGE: 18 OF 24

TRANSFORMER DETAILS:Serial Number : 2698/2Customer Identification : Power Transformer -2Make : Bharath BijileeCapacity: : 15MVAVoltage (HV/MV/LV) : 132kV/6.9kVYear of Manufacture : 1985Year of Installation : 1985Last Date of Filtration : 2008Our Reference No. : LT-0392/01 (Main Tank-Top)Date of Sample Collection : 14th May 2009Date of Receipt of the Sample : 25th May 2009Sample Tested on : 27th to 30th 2009Appearance of the Oil : Bright Yellow ColourTop Oil Temperature : 450CWinding Temperature : --Weather Condition : DryCondition on Receipt : OK

OIL PARAMETERS:

SL NO.

TEST PARAMETERS

Reference Standard IS: 1866: 2000

IS 1866:2000For Oil in Service

TEST RESULTS

Test Method

Limits72.5kV-170kV

B-ClassC-Class

1 Break Down Voltage (BDV)/ Di-Electric Strength) in kV, at a Temp: 27.90C, RH: 46%

IS: 6792-199250Hz±2HzElectrode Type: Brass Spherical, Electrode gap: 2.5mm

>40kV70,72,76,66,74,68=71.0

2 Moisture Content (Water Content) in ppm, at a Temp: 27.7 0C , RH:47%

IS: 13567-1992 Karl Fisher Titration Method 230±10V

≤40 ppm 11

3

Tan Delta (Di–Electric Dissipation Factor) in absolute, at a Temp: 900C, RH: 47%

IS: 6262-1971 50Hz±2HzThree terminal cell 250Vrms\mm: Average voltage gradient in the sample 230±10V

Max1.0

Absolute0.012

4 Resistivity (Specific Resistance) in Ω-cm, at a Temp: 900C, RH: 47%

IS: 6103-1971 Three terminal cell250Vrms\mm: Average voltage gradient in the sample 230±10V

Min0.1 X 10 12

Ω-cm2 x 1012

5 Acidity (Neutralization Number) in mg KOH/g

IS: 1448(P: 2)-1967 Max

0.3 mg KOH/g0.04

6 Interfacial Tension (IFT) in N/m, at a Temp: 27±1 0C

IS: 6104-1971 Ring Method Min 0.0150.043

7 Sludge/Sediment % by weightIS 1866:2000 Annexure A (Clause-4.3)

Sludge should not be detected

ND

8 Flash Point in 0CIS 1448(P: 21)-1992 Pensky Martens closed cup Test Method 230±10V

Min 140 o C156

DISSOLVED GAS ANALYSIS: IS: 10593:1992 & 9434-1992SL NO. CHARACTERISTICS LIMITS <4 YEARS TEST RESULTS

1 Methane PPM 50/70 03

2 Ethylene PPM 100/150 043 Ethane PPM 30/50 024 Acetylene PPM 20/30 045 Carbon Monoxide PPM 200/300 346 Carbon Dioxide PPM 3000/3500 19997 Hydrogen PPM 100/150 088 Total Gas Content %by Volume -- 10.54






PAGE: 19 OF 24

FURAN ANALYSIS: ASTM D 5837-99

SL NO. FURANIC COMPOUNDS (PPB) TEST RESULTS1 5 Hydroxymethyl-2-Furaldehyde 60.4732 Furfuryl Alcohol 21.2103 2 – Furaldehyde 91.2064 2 – Acetyl Furan 3.4175 5 – Methyl –2 – Furaldehyde 17.931

Total 194.237

ANALYSIS & RECOMMENDATION:

For Analysis & Recommendation please refer Page No.: 24 OF 24






PAGE: 20 OF 24

TRANSFORMER DETAILS:Serial Number : 2698/2Customer Identification : Power Transformer -2Make : Bharath BijileeCapacity: : 15MVAVoltage (HV/MV/LV) : 132kV/6.9kVYear of Manufacture : 1985Year of Installation : 1985Last Date of Filtration : 2008Our Reference No. : LT-0393/02(Main Tank-Bottom)Date of Sample Collection : 14th May 2009Date of Receipt of the Sample : 25th May 2009Sample Tested on : 27th to 30th 2009Appearance of the Oil : Bright Yellow ColourTop Oil Temperature : 450CWinding Temperature : --Weather Condition : DryCondition on Receipt : OK

OIL PARAMETERS:

SL NO.

TEST PARAMETERS



TEST RESULTS

Test Method

Limits72.5kV-170kV

B-ClassC-Class



>40kV

68,70,78,72,66

70=70.66≈71.0



≤40 ppm 11

3



Max1.0

Absolute0.0088



Min0.1 X 10 12

Ω-cm3 x 1012


IS: 1448(P: 2)-1967 Max

0.3 mg KOH/g0.12





ND


Min 140 o C156

DISSOLVED GAS ANALYSIS: IS: 10593:1992 & 9434-1992SL NO. CHARACTERISTICS LIMITS <4 YEARS TEST RESULTS

1 Methane PPM 50/70 032 Ethylene PPM 100/150 043 Ethane PPM 30/50 014 Acetylene PPM 20/30 055 Carbon Monoxide PPM 200/300 366 Carbon Dioxide PPM 3000/3500 21437 Hydrogen PPM 100/150 088 Total Gas Content %by Volume -- 11.04






PAGE: 21 OF 24


SL NO. FURANIC COMPOUNDS (PPB) TEST RESULTS1 5 Hydroxymethyl-2-Furaldehyde 50.2262 Furfuryl Alcohol 47.2193 2 – Furaldehyde 98.7714 2 – Acetyl Furan 005 5 – Methyl –2 – Furaldehyde 29.431

Total 225.647








PAGE: 22 OF 24

TRANSFORMER DETAILS:Serial Number : 2698/2Customer Identification : Power Transformer -2Make : Bharath BijileeCapacity: : 15MVAVoltage (HV/MV/LV) : 132kV/6.9kVYear of Manufacture : 1985Year of Installation : 1985Last Date of Filtration : 2008Our Reference No. : LT-0394/03(Main Tank-OLTC)Date of Sample Collection : 14th May 2009Date of Receipt of the Sample : 25th May 2009Sample Tested on : 27th to 30th May 2009Appearance of the Oil : Yellow ColourTop Oil Temperature : 450CWinding Temperature : --Weather Condition : DryCondition on Receipt : OK

OIL PARAMETERS:

SL NO.

TEST PARAMETERS



TEST RESULTS

Test Method

Limits72.5kV-170kV

B-ClassC-Class



>40kV38,34,42,3242,34=37.0



≤40 ppm 27

3



Max1.0

Absolute0.0081



Min0.1 X 10 12

Ω-cm8 x 1012


IS: 1448(P: 2)-1967 Max

0.3 mg KOH/g0.04





ND


Min 140 o C150

DISSOLVED GAS ANALYSIS: IS: 10593:1992 & 9434-1992SL NO. CHARACTERISTICS TEST RESULTS

1 Methane PPM 232 Ethylene PPM 383 Ethane PPM 034 Acetylene PPM 5325 Carbon Monoxide PPM 306 Carbon Dioxide PPM 4757 Hydrogen PPM 118 Total Gas Content %by Volume 12.55






PAGE: 23 OF 24


SL NO. FURANIC COMPOUNDS (PPB) TEST RESULTS1 5 Hydroxymethyl-2-Furaldehyde --2 Furfuryl Alcohol --3 2 – Furaldehyde --4 2 – Acetyl Furan --5 5 – Methyl –2 – Furaldehyde --

Total --








PAGE: 24 OF 24

ANALYSIS & RECOMMENDATION FOR TRANSFORMERSL NO.: 2698/2, ID No: Power Transformer -2

Analysis:

Tests on Solid Insulation:The test results of IR Values, PI & DC absorption ratios are normal considering its age. The variation of Capacitance values with respect to voltage is normal and the Tan Delta values are within the permissible limits, i.e. <0.02absolute.

Tests on Conductor & OLTC:The DC winding resistance values are normal as comparable with all the phases.The turn’s ratio measurements are normal as compared to name plate values.Measurement of Neutral Floating point is normal.

Tests On CoreMagnetization currents are normal.Magnetic Balance test results are normal.

Test On Bushings:The variation of Capacitance values with respect to voltage is normal and the Tan Delta values are within the permissible limits, i.e. <0.007absolute for R&Y- phase. B-phase could not be balanced.

Oil Parameters:The test parameters of the transformer oil samples are within permissible limits as per IS: 1866- 2000 “The maintenance of transformer oil in service”.

DGA:The gases generated are within the permissible limits as per relevant Standards.

Furan Analysis: The total of the Furanic compounds is in the low reliability range.

Conclusion: Solid insulation is normal. Conductor and core are normal. The results of Oil & DGA indicate normal internal condition of the Transformer. The total of the Furanic compounds is in low reliability range. B-Phase Bushing could not be balanced.

Recommendation:

All the tests should be carried out after one year to establish the trend analysis of

Transformer & Oil. All the test results may be retained as bench mark for further analysis. One more furan test to be conducted within 6 months to know the increasing trend in the

furanic compounds. B-Phase bushing is in good condition. For normal operation the condenser bushing test tap is

earthed by screw cap with a centre pin which presses on the test tap for test purpose. The Cap was removed and test tap was connected to C and Tan Delta Bridge for measurement. Most likely this test Cap is grounded even when Cap is removed. So, C and Tan Delta Bridge could not be balanced. So, please refer these results to manufacturer for further action. In the next shutdown one more Megger, Tan Delta and other tests has to be carried out on Bushings.

Note: Test conditions 1) Primary side : HV conductor removed from the Breaker side.2) Secondary side : LT Breaker was made off.



FORMAT NO.: SPL/TR-02

Shanthala Power LimitedTest Inspection Consultancy Anything Anywhere Anytime

Condition Monitoring Tests on Transformers Test Report –2009

Customer:M/s.

Kind Attn: Mr.

Ref: P.O. No.:

“Shanthala”, No-24, Priyadarshini Colony, Gokul Road, Hubli - 580 030. Karnataka (India)Phone: +91-0836 - 2332540, 2335936, 2335934,Fax: 0836 – 2334908, Mobile: 94481-34362,E-mail:[email protected],[email protected]. Website:

www.shanthalaindia.com

http://www.shanthalaindia.com/



Ref: SPL/CMT-Off Line//2009/ Date:06-10-2009

To,M/s.

Kind Attn: Mr.

Dear Sir,

Sub: Condition Monitoring Test on Transformers, -Test Report.Ref: P.O. No.: Test Report No.: 0232/09-10, Dated: 07-09-2009.

Thank you very much for giving us an opportunity to serve you. Please find

enclosed here with the Test Report of Condition Monitoring Tests on Four Nos.

of Transformers. We have also enclosed Service Bill and the Bill No. is 0635,

for the above work. We request you to settle the same at the earliest.

Kindly arrange to send the “Cheque/DD” in the name of “M/s. Shanthala Power

Limited”, Hubli.

Thanking you.

Yours faithfully,

For Shanthala Power Limited

(Mr.Vinod. N.) Chief Executive Officer

Enclosures:I. Test Report:

2. Transformers Test Report : 17+17+17+22=73Pages3. Calibration Certificates : Annexure II Bill4. Service Bill : 02 Page(In Duplicate)5. Service Tax Certificate : 02 Page6. Pan No Certificate : 01 Page

NABL Accredited Laboratory for Transformer Oil Testing (1) BDV (100kV) (2) Water Content(3) Flash Point (4) Tan Delta (5) Resistivity (6) Sludge (7) Acidity (8) IFT (9) DGA (10) Furan Analysis




PAGE: 01 OF 17

TRANSFORMER-TEST REPORT -1

Test Report No. : 0232/09-10

Customer’s Address : M/s. S

Customer’s Reference : P. O. No.:

Particulars of Equipment Tested : Distribution Transformer

Plant Location : Beside of 3MW Power House

Serial No. : 2005/1180

Customer Identification : Sugar Transformer

Make : M/s. Mahati Electricals

Transformer Rating : 3150kVA

Voltage : 11000V/433V

Vector Group : Dyn11


Phase : 3

Date(s) of Test(s) : 28th August- 2009

Winding Temperature : 280C

Oil Temperature : 280C


Weather Condition : Dry

Particulars of Tests Conducted : Condition Monitoring Tests

Customer’s Requirements : Condition Monitoring Tests

Calibration Certificate s : Annexure

Coordinated By Tested Team Mr. Balasaheb. (E.E) Mr. Harshad. Gulannavar. Test Engineer


(Gouri M. Patil) Authorised Signatory (Shashikala. V. T)




PAGE: 02 OF 17


Serial No. : 2005/1180


Date of Test : 28th August-2009

*Average Temperature(Winding +Oil+ Atmospheric) : ≈28.30C



TEST RESULTS

SL NO. TIME HV to LV at 5kV HV to GND at 5kV LV to GND at 0.5kV

1 10th Sec 0.90 G 2.00 G 0.48 G2 20th Sec 1.20 G 2.50 G 0.49 G3 30th Sec 1.50 G 3.00 G 0.49 G4 40th Sec 1.60 G 3.50 G 0.50 G5 50th Sec 1.90 G 4.00 G 0.50 G6 01st Min 2.25 G 4.25 G 0.50 G7 02nd Min 3.00 G 5.00 G 0.50 G8 03rd Min 3.75 G 5.00 G 0.50 G9 04th Min 4.00 G 5.50 G 0.50 G

10 05th Min 4.50 G 5.50 G 0.50 G11 06th Min 4.50 G 6.00 G 0.50 G12 07th Min 4.80 G 6.50 G 0.50 G13 08th Min 5.00 G 6.50 G 0.50 G14 09th Min 5.50 G 6.50 G 0.50 G15 10th Min 6.50 G 7.00 G 0.50 G

Note: 1) For test conditions please refer page No. 2) *Average Temperature → (Winding + Oil + Atmospheric) =280+280+290≈28.30C






PAGE: 03 OF 17


Serial No. : 2005/1180






TEST RESULTS

SL No.

Mode of Test

Voltage (kV)

IR Values in GPI

DC Absorption

Ratio30th Sec 60th Sec 600th Sec

1 HV-LV 5 1.50 2.25 6.50 2.88 1.5

2 HV-GND 5 3.00 4.25 7.00 1.64 1.41

3 LV-GND 0.5 0.49 0.50 0.50 1.0 1.02

Polarization Index Dielectric Absorption Ratio

600- Seconds IR ValuePI = -------------------------------

60-Seconds IR Value

60-Seconds IR ValueDA = -------------------------------

30-Seconds IR Value

Note: 1) For test conditions please refer page No. 17 of 17 2) *Average Temperature → (Winding + Oil + Atmospheric) =280+280+290≈28.30C






PAGE: 04 OF 17





FORMAT NO.: SPL/TR-02 Calibration & Test Report PAGE: 05 OF 17

Section

MEASUREMENT OF STEP VOLTAGE TRANSFORMER DETAILS:

Serial No. : 2005/1180






TEST RESULTSSl. No. Mode of

TestGrounded Winding

Voltage(kV)

IR in GAt 60th Sec

1 HV-LV Nil

0.5 1.21.0 1.4

2.5 2.0

5.0 3.0

2 HV-GND LV

0.5 10.01.0 3.0

2.5 2.75

5.0 3.5







PAGE: 06 OF 17

MEASUREMENT OF CAPACITANCE, TAN DELTA AND LEAKAGE CURRENT ON WINDINGS


Serial No. : 2005/1180






TEST RESULTSMode of

TestGrounded Winding

Voltage(kV)

Current(mA)

Capacitance(pF)

Tan Delta(Absolute)

HV-LV

(UST)Nil

2.11 04 4089.63 0.00654

4.23 09 4089.83 0.00658

6.35 15 4089.94 0.00666

HV-GND

(GST)LV

2.11 04 8195.39 0.00739

4.23 09 8195.39 0.00761

6.35 15 8196.40 0.00768

Note: 1) For test conditions please refer page No. 17 of 17 2) *Average Temperature → (Winding + Oil + Atmospheric) =280+280+290≈28.30C 3) Because of low voltage on LV side, the LV-GND Tan Delta Test could not be conducted.






PAGE: 07 OF 17






PAGE: 08 OF 17

MEASUREMENT OF HIGH VOLTAGE EXCITATION CURRENT ON HV WINDINGS TRANSFORMER DETAILS:

Serial No. : 2005/1180






TEST RESULTSTested Phase Applied Voltage

(kV)Measured Current (mA)

R-Y

0.5 10

1.0 15

1.5 20

2.0 25

2.5 30

Y-B

0.5 12

1.0 20

1.5 27

2.0 33

2.5 39

B-R

0.5 12

1.0 20

1.5 27

2.0 33

2.5 39







PAGE: 09 OF 17

MEASUREMENT OF DC WINDING RESISTANCE TRANSFORMER DETAILS:

Serial No. : 2005/1180






TEST RESULTS

OLTC Position

Current (mA) Measurement of Winding Resistance (HV-Side)

Tested Phase Resistance in m

04

126.1 R-N 215.1

126.1 Y-N 215.2

126.1 B-N 215.0

Sl No. Current (A) Measurement of Winding Resistance (LV-Side)

Tested Phase Resistance in m

01

1.303 (r-n) 0.5

1.304 (y-n) 0.5

1.287 (b-n) 0.5







PAGE: 10 OF 17

MEASUREMENT OF VOLTAGE RATIO TRANSFORMER DETAILS:

Serial No. : 2005/1180






TEST RESULTS

Sl. No.

Voltage Ratio

Applied Voltage at Primary

side in Volts

Measured Voltage at

Secondary side in VoltsCalculated Voltage Ratio

R-Y Y-B B-R r-y y-b b-r r-y y-b b-r

01 407 408 408 15.79 15.75 15.83 25.77 25.90 25.77







PAGE: 11 OF 17

MEASUREMENT OF MAGNETIZATION CURRENT


Serial No. : 2005/1180






TEST RESULTS

Tested Phase Measured Voltage (V) Measured Current (mA)

R 404 18.7 (R-Y)

Y 408 12.1 (Y-B)

B 409 22.3 (B-R)







PAGE: 12 OF 17

MEASUREMENT OF NEUTRAL FLOATING POINT TRANSFORMER DETAILS:

Serial No. : 2005/1180






TEST RESULTS

Voltage Applied Across HV Side (V) Voltage Measured (V)

R-Y Y-B B-RLV (Neutral)-GND

407 408 408 6.30







PAGE: 13 OF 17

FREQUENCY RESPONSE ANALYSIS


Serial No. : 2005/1180






TEST RESULTS

Frequency Rage : 20Hz-2MHZ

Tap Position : 1

Method : Sweep Frequency

Measured winding a) HV side: U-V, V-W, W-U b) LV Side: n1-u1, n1-v1, n1-w1.

PLEASE SEE NEXT PAGE FOR GRAPHS







PAGE: 14 OF 17

OIL-TEST REPORT

Test Report No. : 0232/09-10

Customer’s Address : M/s.

Customer’s Reference : P. O. No.

Particulars of Sample Tested : Transformer Oil

Date (S) of Test (S) : 7th to 11th September 2009

No. Of Samples Tested : 01(Bottom)

Customer’s Requirement : BDV, Moisture Content, Tan Delta, Resistivity, Acidity, IFT, Sludge, Flash Point DGA , Kinematic Viscosity, Density Pour Point & Furan Tests.

Whether Tests conducted as per Customer’s Requirement : Yes

Coordinated By Sample Collected By Mr. Balasaheb. (E.E) Mr. Harshad G Test Engineer

Mr. Shivappa

Note:

1. The test results relate only to the sample(s) tested.

2. ND-Not Detected.

3. NA: Not Applicable.

4. NP: Not Provided.

5. NM: Not Mounted

6. ---: Customer not confirmed.

7. CCSUT: Customer Confirmed, Sample Under testing.

8. The limits for DGA are valid from the last date of filtration.

9. If the last date of filtration is not specified, the limits for DGA are considered from the year of

installation.

10. Any Anomaly / Discrepancy in this test report / certificate should be brought to our notice within 60 days

from the date of issue.

11. The Test Report not to be reproduced except in full, without written approval from the laboratory






PAGE: 15 OF 17

TRANSFORMER DETAILS:Serial Number : 2005/1180Customer Identification : Besides of Boiler Sugar Transformer Make : Mahati ElectricalsCapacity : 3150kVAVoltage (HV/LV) : 11000V/433VYear of Manufacture : 2005Year of Installation : NPLast Date of Filtration : NPOur Reference No. : LT-1418/01 (Main Tank-Bottom)Date of Sample Collection : 29th August 2009Date of Receipt of the Sample : 7th September 2009Sample Tested on : 7th to 11th September 2009Appearance of the Oil : Pale Yellow ColourTop Oil Temperature : 280CWinding Temperature : 280CWeather Condition : DryCondition on Receipt : OK

OIL PARAMETERS:SL NO.

TEST PARAMETERS Reference Standard IS: 1866: 2000

IS 1866:2000For Oil in Service TEST

RESULTS Test Method <72.5kV-C-Class

1Break Down Voltage (BDV)/ Di-Electric Strength) in kV, at a Temp: 29.20C, RH: 40%


>30kV66,78,74,68,7078=72.33≈72.

0

2 Moisture Content (Water Content) in ppm, at a Temp:28.10C, RH:47%


≤40 ppm 11

3



Max 1.0 Absolute

0.0044



Min 0.1X1012

Ω-cm

49 x 1012


IS: 1448(P: 2)-1967 Max 0.3mg KOH/g

0.02


IS: 6104-1971 Ring Method Min 0.015

0.043


Sludge Should not be detected

ND


Min 1400C 154

DISSOLVED GAS ANALYSIS: IS: 10593:1992 & 9434-1992SL NO. CHARACTERISTICS LIMITS 4-10YEARS TEST RESULTS

1 Methane PPM 100/150 022 Ethylene PPM 150/200 013 Ethane PPM 100/150 ND4 Acetylene PPM 30/50 ND5 Carbon Monoxide PPM 400/500 076 Carbon Dioxide PPM 4000/5000 8367 Hydrogen PPM 200/300 018 Total Gas Content %by Volume ---- 10.03

Note: NP- Not Provided, ND-Not Detected






PAGE: 16 OF 17


SL NO. FURANIC COMPOUNDS (PPB) TEST RESULTS1 5 Hydroxymethyl-2-Furaldehyde 002 Furfuryl Alcohol 003 2 – Furaldehyde 7.8764 2 – Acetyl Furan 6.8245 5 – Methyl –2 – Furaldehyde 5.916

Total 20.616

OIL PARAMETERS:SL

NO. TEST PARAMETERS Reference Standard- IS: 1866: 2000

LimitsTEST RESULTS

Test Method

1Kinematic Viscosity (cStr), at 270C

IS:1448(P:25)-1976 27cst 5

2 Pour Point in 0C IS:1448 (P:10)-1970 Max: -60C -18

3 Density in kg/cm3 at 29.50C IS:1448(P:16)1990 Max:0.89 g/cm3 0.825








PAGE: 17 OF 17

ANALYSIS & RECOMMENDATION FOR TRANSFORMER-1SL NO.: 2005/1180, ID No: Besides Boiler Sugar Transformer

Analysis:

Tests on Solid Insulation:

The test results of IR, PI and DC absorption ratios are normal. The variation of Capacitance values with respect to voltage is normal and the Tan Delta values are within the permissible limits, i.e. <0.02absolute.Step Voltage results have variation.

Tests on Conductor & OLTC:The DC winding resistance values are normal as comparable with all the phases.The voltage ratio measurements are normal.Neutral Floating point Measurements are normal.

Tests on Core:Magnetization Currents are normal.Excitation current results are normal.Frequency Response Analysis:The test results of FRA should be compared with earlier results to arrive at a definite conclusion. How ever taking present test results as benchmark any further changes can be noticed by conducting FRA test at a later date under similar conditions.

Oil Parameters:

The tested parameters of the oil sample of this Transformer are within the permissible limits as per IS:1866-2000 “The parameter of Transformer Oil in service”.

DGA:The gases generated are within the permissible limits as per relevant Standards.

Furan Analysis: The total of the Furanic compounds is in the normal range.

Conclusion: Step Voltage results have variation. Core and Conductor are normal. Oil and DGA results are normal. The total of the Furanic compounds is in the normal range. The test results of FRA may be retained as reference for future guidance.

Recommendation: All the Condition Monitoring tests should be carried out after one year to establish the trend analysis of

Transformer & Oil. All the test results may be retained as bench mark for further analysis. Since the step voltage results have variation, one more test should be repeated within 6 months or as

per your convenience, to know the insulation condition.

Note: Test Conditions: 1) The Transformer was Isolated completely from both sides, Primary and secondary sides.



Transformer Test Report

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