field service report eaton electrical services and system ... · pdf fileperiodic tests, both...

Field Service Report Eaton Electrical Services and System

March 31, 2017

Attention

Luis Castro

Facilities Superintendent

Abbott Vascular Costa Rica

Reference number EESS-SE007-17

Attached you will find the report with the summary of the actions taken on December

26, 2016,

As part of scheduled preventive maintenance to two pedestal transformers in Abbott

Vascular located in the Coyol Free Zone of Alajuela.

In this document the activities performed, the result of electrical tests, physical

analysis

Chemical, comments, conclusions and recommendations.

Sincerely

Fray J. Carrillo Fonseca Field Service Technician

Phone: +506 2247-7679

Cellphone: +506 88370865

[email protected]

DC:

Jose G Cardenas C

EESS Manager - CA

Eaton Engineering Service & Systems

Telephone +50766121199, +5072002010

Page 2

Field Service Report 2

TECHNICAL REPORT "Preventive Maintenance Two transformers. "

Property of:

Abbott.

Requested by:

Ricardo Brenes.

Coordinator:

Fray Carrillo Fonseca

Date of work:

December 28, 2016

mailto:[email protected]


CONTENT INDEX OF FIGURES ............................................... ..................................................

................................ 5

TABLE OF CONTENTS ...............................................

.................................................. .................................. 6

1. INTRODUCTION............................................... ..................................................

................................ 7

2. DESCRIPTION OF THE WORK PERFORMED. ..................................................

.............................. 8

2.1. Visual inspection. .................................................. ..................................................

8

2.2. Transformation Relationship Test. ..................................................

...................................... 8

2.3. Insulation Resistance Test. ..................................................

........................................ 9

2.4. Winding Resistance Test. ..................................................

.......................................... 9

2.5. Power Factor Test. ..................................................

.................................................. 9

2.6. Dielectric and Physical-Chemical Analysis ............................................

............................................ 10

2.7. Dissolved Gas Chromatography ..............................................

................................................ 10

3. ANALYSIS OF RESULTS. ..................................................

.............................................. eleven

3.1. Transformer 11JC561840001. ..................................................

............................................... 12

3.1.1.

Visual Inspection 11JC561840001. ..................................................

................................... 13

3.1.2.

Transformation Ratio Test 11JC561840001. .................................................. 13

3.1.3.

Insulation Resistance Test 11JC561840001. .................................................. 14

3.1.4.

Winding Resistance Test 11JC561840001. .................................................. ..... 17

3.1.5.

Power Factor Test 11JC561840001. .................................................. ................. 19

https://translate.googleusercontent.com/translate_f#5


























































3.1.6.

Dielectric and Physical-Chemical Analysis

11JC561840001. .................................................. ... twenty

3.1.7.

Dissolved Gas Chromatography 11JC561840001. ..................................................

......... twenty-one

3.2. Transformer 11JC561840002. ..................................................

............................................... 24

3.2.1.

Visual Inspection 11JC561840002. .................................................. 25

Page 4


3.2.2.

Transformation Ratio Test 11JC561840002. .................................................. 25

3.2.3.

Insulation Resistance Test 11JC561840002. .................................................. 26

3.2.4.

Winding Resistance Test 11JC561840002. .................................................. ..... 29

3.2.5.

Power Factor Test 11JC561840002. .................................................. .................. 31

3.2.6.

Dielectric and Physical-Chemical Analysis

11JC561840002. .................................................. 32

3.2.7.

Dissolved Gas Chromatography 11JC561840002. .................................................. 33

4. CONCLUSIONS ............................................... ..................................................

.............................. 36

4.1. Transformer 11JC561840001. ..................................................

............................................... 36

4.2. Transformer 11JC561840002. ..................................................

............................................... 36

5. FINAL RECOMMENDATIONS. ..................................................

................................................. 38

6. ANNEXES. .................................................. ..................................................

........................................ 39

6.1. Certificates of equipment calibration. .................................................. 39

6.1.1.

Megger S1-1052 Testing Equipment. ..................................................

.................................. 39


























































6.1.2.

Test Equipment OMICRON CPC 100. ...........................................

.................................. 42

6.2. Laboratory Tests of Oils. .................................................. 44

Page 5


INDEX OF FIGURES Figure 1. Historical Transformation Relationship

11JC561840001. .................................................. 14

Figure 2. Insulation resistance vs. resistance curve. Time

11JC561840001. .............................................. 16

Figure 3. Historical Insulation Resistance

11JC561840002. .................................................. 16

Figure 4. Historical Winding Resistance Primary

11JC561840001. .................................................. 18

Figure 5. Historical Winding Resistance Secondary

11JC561840001. .............................................. 18

Figure 6. Historical Isolation Power Factor

11JC561840001. .................................................. 19

Figure 7. Historical Oil Dielectric Strength and Water Content

11JC561840001. ........................ twenty

Figure 8. Historical Number of Neutralization and Specific Gravity

11JC561840001. ........................... twenty-one

Figure 9. Historical Interfacial Voltage and Color

11JC561840001. .................................................. ............. twenty-one

Figure 10. Historical Gas Chromatography in Oil

11JC561840001. .............................................. 22

Figure 11. TGC History in Oil 11JC561840001. ..................................................

.......................... 2. 3

Figure 12. Historical Transformation Relationship

11JC561840002. .................................................. 26

Figure 13. Insulation resistance vs. resistance curve. Time

11JC561840002. ............................................ 28

Figure 14. Historical Insulation Resistance

11JC561840002. .................................................. 28

Figure 15. Primary Winding Resistance History

11JC561840002. ................................................ 30

Figure 16. Historical Winding Resistance Secondary

11JC561840002. ............................................ 30

























































Figure 17. Historical Isolation Power Factor

11JC561840002. .................................................. 31

Figure 18. Historical Oil Dielectric Strength and Water Content 11JC561840002. 32


11JC561840002. 33

Figure 20. Historical Interfacial Voltage and Color

11JC561840002. .................................................. 33

Figure 21. Historical Gas Chromatography in Oil

11JC561840002. .............................................. 3. 4

Figure 22. TGC History in Oil 11JC561840002. ..................................................

.......................... 35

Page 6


TABLE OF CONTENTS

Table 1. Equipment data 11JC561840001. ..................................................

............................................... 12

Table 2. Summary Visual Inspection 11JC561840001. ..................................................

.............................. 13

Table 3. Transformation Ratio Test 11JC561840001. ..................................................

........... 13

Table 4. Insulation Resistance 11JC561840001. ..................................................

.............................. fifteen

Table 5. Winding Resistance 11JC561840001. ..................................................

................................ 17

Table 6. Power Factor 11JC561840001. ..................................................

............................................ 19

Table 7. Physical-Chemical Analysis 11JC561840001. ..................................................

................................ twenty

Table 8. Dissolved Gas Chromatography

11JC561840001. .................................................. 22

Table 9. Equipment data 11JC561840002. ..................................................

............................................... 24

Table 10. Summary Visual Inspection

11JC561840002. .................................................. 25

Table 11. Transformation Ratio Test 11JC561840002. ..................................................

25

Table 12. Insulation Resistance 11JC561840002. ..................................................

............................ 27






















































Table 13. Winding Resistance 11JC561840002. ..................................................

.............................. 29

Table 14. Power Factor 11JC561840002. ..................................................

......................................... 31

Table 15. Physical-Chemical Analysis

11JC561840002. .................................................. .............................. 32

Table 16. Dissolved Gas Chromatography

11JC561840002. .................................................. ................. 3. 4

Page 7


1. INTRODUCTION Transformers are usually very reliable equipment. However, as the

Aging and approaching the end of their useful life, their components wear out and the

probability of

Failure grows The main problems are the deterioration of cellulose and the movement

of the core and

Windings. Other problems can also be caused by faults, such as wear of parts of the

Tap changer, false contacts, high moisture contents in the oil, among others.

Periodic tests, both electrical and exploratory, are used to monitor the

Condition of the isolation and to evaluate the remaining life of the

equipment. However, a

Clear engineering judgment to discern whether the estimated remaining life

guarantees future functioning

Fault-free.

The comparisons of results obtained between one and another period of tests carried

out,

As the most detailed historical analyzes over extended periods of testing over the

years, are a

An important tool in formulating a series of successful conclusions about a team

specific. Therefore, a graphic study of the behavior of results in the diagnoses

Preventive measures taken to a team, becomes of vital importance to determine a

possible latent failure

Or indicate a corrective maintenance to follow.

ENERPOT, SA, in order to always provide the best and most detailed service to its

customers,

Incorporates as an added value, a graphic study detailing each test carried out, where

Evaluate the results obtained for each transformer after being tested, analyzed and

Diagnosed. This graphic historical study will allow us to establish a trend about life













Of the equipment under observation, as well as to define a better and more specific list

of

Recommendations and steps in preventive or corrective maintenance.

In this report the status of the following equipment is announced:

• Transformer pedestal type, ABB brand, 2500 kVA, 11JC561840001 series.

• Transformer pedestal type, ABB brand, 2500 kVA, 11JC561840002 series.

Located at the moment of the test in the facilities of Abbott, in Zona Franca El Coyol,

Alajuela.

Page 8

Field Service Report Referring to Fig.

2. DESCRIPTION OF THE WORK PERFORMED. This section describes the tests performed, as well as the different jobs

Made to processors. Tests 2.2 to 2.5 correspond to electrical tests, while 2.6

and 2.7 relate to testing the insulating oil, made by SD Myers in Ontario, Canada,

Testmark

Laboratories Ltd., which has ISO / IEC 17025: 2005 accreditation, issued by

Canadian

Association for Laboratory Accreditation INC. (CREEK).

2.1 Visual inspection.

At the beginning of the work, a general inspection is carried out on the state of the

equipment, taking into

External wiring status, leaks, paint condition, corrosion occurrence,

Different measurement indicators present in the equipment, among others.

Equipment used: Not applicable.

Security for testing: Barricades and PPE (personal protective equipment).

2.2. Transformation Relationship Test.

The test is performed according to the ANSI / IEEE standard C57.12.90-2010.

In new transformers it must be carried out in all positions of the tap changer.

For transformers in use it is not recommended to manipulate the device in field tests,

this must

Only be operated to vary the voltage when required by plant arrangements.

It must be verified its general condition or that the client so requires and under his

responsibility. If he

Is manipulated by operational needs, it is recommended to

Of contact resistance in the new position.

By means of the application of tension between two terminals allows us to identify

shorts between turns,

Damage to the switch (Tap) and wrong positions of the switch. The limits for this test

according to IEEE

C57.12.00 are ± 0.5% of the nominal.

This test also detects the polarity and the angular displacement (diagram

Phasorial) at the same time.

Equipment used: Omicron CPC 100.

Security for testing: Barricades and EPP.

Page 9

Field Service Report Referring to Fig.

2.3 Insulation Resistance Test.

The test is performed according to the ANSI / IEEE standard C57.12.90 - 2010.

It consists of applying voltage in direct current for a period of time determined to the

Insulation system and thus measure the resistance between windings and between

each winding and earth.

The results are plotted for a better appreciation and are compared with the theoretical

minimum, which is

Obtains from the formula for minimum insulation resistance, SD Myers Inc.

Equipment used: meghometro Megger brand, model S1-1052.


2.4. Winding Resistance Test.


The values measured by this test can be used in the detection of windings

Shorted, weak joints, false contacts and changes in windings due to alterations in the

Capacitance. The ideal would be to compare these data with those of factory or those

obtained in previous tests,

But if they are not available, a consistency must be expected in the values of each of

the phases

(Difference not greater than 5%), or compare them with another identical unit.

Team: Omicron CPC 100.


2.5. Power Factor Test.


The values obtained are used to create a measurement history and compare the results

With the first data obtained from the transformer.

The values measured by this test indicate the quality at the level of internal insulation

Of the transformer and the amount of leakage current is evaluated through the

winding system, since it is

Very sensitive to the presence of water and oxidation products generated by the oil

and therefore,

Verifies whether there are paths for the leakage current and the heat losses dissipated

in heat, which results

In chemical deterioration, damage due to overheating, presence of moisture.

It is a test that complements and gives greater assurance of the oil test analysis

Such as Physical-Chemical Analysis and Gas Chromatography.

Equipment used: Omicron CPC 100.

Security for testing: Barricades and risk EPP electrical contact

Page 10


2.6. Dielectric and Physical-Chemical Analysis

For the extraction of the oil sample, the ASTM method D 923 - 97 is applied.

It consists of executing a series of monitor tests essential for a diagnosis

The situation of the transformer, this in regard to its necessity of maintenance,

because by means of

They can quantify the two enemies of the insulation paper, ie the percentage of water

in the paper and

The degree of impregnation therein of the oxidation products generated by the oil.

Equipment: hoses and connection fittings, bottles sample storage.


2.7. Dissolved Gas Chromatography

For the extraction of the oil sample the method ASTM D 3613 - 98 is applied.

It is an oil analysis that is based on the breakdown of hydrocarbon molecules

Both in oil and in cellulose due to the presence of some type of thermal or electric

failure. The

Gases produced by this break can be collected in a sample of oil taken

Appropriately, and be analyzed by highly sensitive methods.

Equipment: hoses and connection fittings, syringes sample storage.


Page 11

Field Service Report eleven

3. ANALYSIS OF RESULTS. It starts by presenting the plate data of each tested equipment, to later analyze the

Values collected through the different tests. We present a set of tables, each one

Identified with the name of the respective test, as well as the corresponding

explanation and diagnosis

Of the results obtained. Finally the behavior of each test is observed with the passage

of the

weather.


3.1. Transformer 11JC561840001.

Table 1. Equipment data 11JC561840001.

Project N ° 1254

Date 28-12-16

Client: Abbott

Coordinator: David Villamil

Location: Free Zone El Coyol

Work performed:

Characteristic

Value

Position

Voltage (V) Serial number

11JC561840001

1

36225

Field identification

T2

2

35363

Brand

ABB

3

34500

Kind

Pedestal

4

33638

Manufacturing date

APR2011

5

32775

Power (kVA)

2500

Primary Voltage (V)

34500/19920

Secondary Voltage (V)

480/277

Short Circuit Impedance (%)

5.91

Basic Impulse Level (kV)

150-30

Total Mass

15855 lb

Amount of Insulating Liquid

606 Gal

Type of Insulating Liquid

BIOTEMP

Material Windings

Cuckoo

Changer Position

3

Connection Diagram Connection Group: Yyn0

Derivation Changer Preventive Maintenance

Transformer plate data

Page 13


3.1.1. Visual Inspection 11JC561840001.

In Table 2 the information gathered by the visual inspection is

summarized. Everything points

To a team working in satisfactory conditions.

Table 2. Summary Visual Inspection 11JC561840001. 3.1.2. Transformation Ratio Test 11JC561840001.

The test was performed at position C of the shunt changer, which was found in

the same. Table 3 shows the data collected.

Table 3. Transformation Ratio Test 11JC561840001. The deviation shown in the results obtained is satisfactory, being 0.06% with

With respect to the theoretical value. The range allowed by the regulation is ±

0.5%, to remain within the

Acceptable ranges, it is guaranteed that the equipment does not have adjacent short

circuit

Cause transformer secondary side voltages or overheating.

Notes

Hits

Leaks

Painting

Corrosion

Others:

Oil level

Temp. oil:

40

or C

Max. Temp. oil:

51

or C

Temp windings:

ND

Internal Pressure

3 psi

Yes

Do not

Yes

Do not

Okay

Deteriorated

Yes

Do not

Okay

Low

Phase, Tap V prim. Nom. Vsec. Nom. Rel. Nom.

Relationship A 003

34500.0V

480.0V

71,875: 1 999.63V 0.0 ° 13.900144V ° 71.9151 0.02: 1 0.06% -60.68 ° 0.003822A

B 003

34500.0V

480.0V

71,875: 1 1000.36V0.0 ° 13.909964V 0.0 ° 71.9168: 1 0.06% -64.74 ° 0.005868A

C 003

34500.0V

480.0V

71,875: 1 999.64V 0.0 ° 13.899995V ° 71.9166 0.02: 1 0.06% -61.06 ° 0.003994A

I prim.

V prim.

Vsec.

Page 14


Transformation Relationship History 11JC561840001.

Figure 1. Historical Transformation Relationship 11JC561840001. It is observed that the transformation ratio has remained very constant throughout the

3 years

In analysis, always within the established ranges, close to the theoretical value. It is

concluded that the result

test is satisfactory.

3.1.3. Insulation Resistance Test 11JC561840001.

For the type of configuration of the windings, which corresponds to

a Yyn0 connection with

Primary and secondary levels internally bound, it was possible to perform only the test

that

Determines the resistance existing between the primary plus secondary to ground. The

test was performed at

1000 V DC. Values obtained are shown in Table 4.

To interpret the data correctly, the minimum insulation resistance value

With the measurement (corrected) made after the first minute. This value was 1.52

GΩ, exceeding the

calculated theoretical minimum of 0552 GΩ.

Page 15

Field Service Report fifteen

Table 4. Insulation Resistance 11JC561840001. As far as the polarization index is concerned, an assessment of positive insulation is

which is within the range of acceptability corresponding to 1.25 to 2.0, indicating that

the current

Leakage rate does not increase at a faster rate with the increase in voltage, which

would indicate contamination or

Damaged insulation; whereas although the absorption rate was below 1.4, this

Condition alone is not decisive in identifying the general state of the insulation.

Finally, in Figure 2 the graph of resistance against time is observed. In the same

Shows an increasing tendency throughout the test, sign of a system of insulation in

good condition.

Room temp:

33.7 ° C

Relative Humidity: 33%

Temp windings:

40 ° C

V dc applied

T (min)

Measured value

Corrected Value

Measured value

Corrected Value

Measured value

Corrected Value

0.25

0247

0.976

---

---

---

---

0.50

0.317

1.25

---

---

---

---

0.75

0.358

1.41

---

---

---

---

1

0.386

1.52

---

---

---

---

2

0.447

1.77

---

---

---

---

3

0.481

1.90

---

---

---

---

4

0.503

1.99

---

---

---

---

5

0.520

2.05

---

---

---

---

6

0.535

2.11

---

---

---

---

7

0.546

2.16

---

---

---

---

Referring to Fig.

0.556

2.20

---

---

---

---

Referring to Fig.

0.565

2.23

---

---

---

---

10

0.573

2.26

---

---

---

---

Rmin GΩ

IA

IP

1000

---

---

Connection

Primary + secondary to mass

---

0.552

---

---

---

GΩ

---

---

1.22

---

---

1.48

---

---

Page 16


Figure 2. Insulation resistance vs. resistance curve. Time 11JC561840001.

History of Insulation Resistance 11JC561840001.

Figure 3. Historical Insulation Resistance 11JC561840002. There is an irregular behavior in the historical curve of insulation resistance. As

In the previous tests, values were obtained close to the recommended minimum, but

the

Have come close to initial values. In this test, external conditions, such as

Humidity, temperature, dust, among others, can influence the results obtained. Despite

the


Variations, it is observed that the values are far from recommended minimums, so that

the current reality

Is that the equipment has a system of isolation in perfect conditions.

Thus, we conclude that the test result is positive.

3.1.4. Winding Resistance Test 11JC561840001.

Since resistance values vary with temperature, all measurements must be

Converted to a common temperature so they can be compared and interpreted

properly. Because

most factory tests are performed at 75 ° C, this value is used as reference. Table 5

the results of this test, including adjustment for 75 or C is.

Table 5. Winding Resistance 11JC561840001. In the measurements corresponding to the primary side, higher values are shown than

the

Obtained in the secondary, as expected (due to the size and quantity of conductor), but

Note that in both cases there is consistency between phases, with differences of no

more than 5%, which is

Translates into no loose spots or bad contact. The most accurate diagnosis is made

Compare the data with the factory or previous tests.

H1-H0

H2-H0

H3-H0

X1-X0

X2-X0

X3-X0

I test: N / a

N / a

N / a

6.0A

6.0A

6.0A

V test: N / a

N / a

N / a

0.0019464V

0.0018829V

0.0018563V

R measurement: 1.200973Ω

1.163893Ω

1.16738Ω

0.0003244Ω

0.00031382Ω 0.00030938Ω

T measurement: 29.5 ° C

28.0 ° C

28.8 ° C

31.1 ° C

31.3 ° C

31.7 ° C

T reference: 75.0 ° C

75.0 ° C

75.0 ° C

75.0 ° C

75.0 ° C

75.0 ° C

R compensated: 1.4075676Ω

1.37188909Ω 1.37182638Ω 0.00037792Ω 0.00036532Ω 0.00035961Ω

Primary winding

Secondary winding

Temperature Compensation for Copper:

Page 18


Historical Winding Resistance 11JC561840001.

Figure 4. Historical Winding Resistance Primary 11JC561840001.

Figure 5. Historical Winding Resistance Secondary 11JC561840001. In general, a behavior is practically invariable, with consistency between phases,

Which means that there is no deterioration in the transformer internal windings or

connections.

It is determined that the state of the transformer with respect to the winding resistance

is

acceptable.


3.1.5. Power Factor Test 11JC561840001.

The test data are summarized in Table 6.

Table 6. Power Factor 11JC561840001. As can be seen, the value registered power factor is 0.47%, below 1%

Recommended for transformers in use. In this way, it can be affirmed that the liquid

Transformer is found with low levels of moisture and oxidation.

Isolation Power Factor History 11JC561840001.

Figure 6. Historical Isolation Power Factor 11JC561840001. Results are identical to those of the tests carried out the previous year, which indicates

that the

Good insulation system conditions are maintained.

The test result is acceptable.

K

I do not accept

You too

humidity

Relative 0.64

40.0 ° C

33.0 ° C

0.3%

Proof

V test (V) V output (V) I output (mA)

Frequency

(Hz)

Cp (nF)

PF (%)

Evaluation CH + L

1,000

1,001

6.113444

60

16.203599

0.47%

Acceptable

Compensation

Temperature:

Field Service Report twenty

3.1.6. Dielectric and Physical-Chemical Analysis 11JC561840001.

As shown in Table 7, the analysis indicates that the oil is normal condition

Of operation, all measured variables are acceptable, the overall picture of the test is

that the oil

Is in good physical - chemical condition.

Table 7. Physical-Chemical Analysis 11JC561840001. History of Physical-Chemical Analysis 11JC561840001.

Figure 7. Historical Oil Dielectric Strength and Water Content 11JC561840001.

Unity

Measured value

State KV / 2.54mm

54

Acceptable Mg KOH / g

0.07

Acceptable 0.92

Acceptable MN / m

31

Acceptable 1.5

Acceptable Any

Acceptable Mg / kg (ppm)

60

Acceptable Interfacial tension

Color

Sediments

Water Content

Proof Dielectric strength

Neutralization Number

Specific Gravity

Field Service Report twenty-one


11JC561840001.

Figure 9. Historical Interfacial Voltage and Color 11JC561840001. According to the graphs above, most of the parameters have been kept within ranges

With the limits established in the 4 periods under study, with the observations of

That the color is a little above the ideal. In addition, the low Interfacial voltage has

returned to

Yield a satisfactory result, which allows to discard problems in the oil.

After analyzing the behavior of the physical and chemical parameters of the oil in the

4

registered periods is concluded that the test result is acceptable.

3.1.7. Dissolved Gas Chromatography 11JC561840001.

In Table 8, the gas content identified by the test CDG is.

As can be seen, there is a slightly elevated concentration of Carbon Dioxide while

The other compounds are within the normal ranges, so that a behavior of

Normal operation.

Page 22


Table 8. Dissolved Gas Chromatography 11JC561840001. History of Gas Chromatography 11JC561840001. We compare the tests performed in the years detailed above.

Figure 10. Historical Gas Chromatography in Oil 11JC561840001.

Analyzed gases

Condition Oxygen (O2)

1,610

-

Nitrogen (N2)

64,400

-

Hydrogen (H2)

32

1

Carbon Monoxide (CO)

214

1

Methane (CH4)

fifteen

1

Ethylene (C2 H4)

7

1

Etane (C2 H6)

4

1

Acetylene (C2 H2)

0

1

Carbon Dioxide (CO2)

2,970

2 272

1

Concentration (ppm) FUEL GAS SUBTOTAL (ppm)

TOTAL GASES (PPM) Condition 1: Normal. Condition 2: Observation. Condition 3: High level, set

trend. Condition 4: Excessive decomposition, possible transformer failure.

69,252

Field Service Report 2. 3

Figure 11. TGC History in Oil 11JC561840001. According to the two graphs above, the concentration of the different gases has shown

small

Changes over time, which means that the team keeps working

Internal faults.

After analyzing the behavior of the parameters of generation of oil gases in the

periods available, it is concluded that the test result is acceptable.

Page 24


3.2. Transformer 11JC561840002.

Table 9. Equipment data 11JC561840002.

Project N ° 1254

Date 28-12-16

Client: Abbott

Coordinator: David Villamil

Location: Free Zone El Coyol

Work performed:

Characteristic

Value

Position

Voltage (V) Serial number

11JC561840002

1

36225

Field identification

T1

2

35363

Brand

ABB

3

34500

Kind

Pedestal

4

33638

Manufacturing date

APR2011

5

32775

Power (kVA)

2500

Primary Voltage (V)

34500/19920

Secondary Voltage (V)

480/277

Short Circuit Impedance (%)

5.94

Basic Impulse Level (kV)

150-30

Total Mass

15855 lb

Amount of Insulating Liquid

606 Gal

Type of Insulating Liquid

BIOTEMP

Windings material

Cuckoo

Position Changer

3

Derivation Changer Preventive Maintenance

Data plate transformer

Connection Diagram Connection Group: Yyn0

Page 25


3.2.1. Visual inspection 11JC561840002. In Table 10 the information gathered by the visual inspection is summarized. All

points to a team working under satisfactory conditions.

Table 10. Summary Visual Inspection 11JC561840002.

3.2.2. Transformation ratio test 11JC561840002. The test was conducted at the C tap changer, which was where he found

the same. In Table 11 the data collected is.

Table 11. Transformation Ratio Test 11JC561840002. The deviation shown in the results obtained is satisfactory, being a 0.06% with

of the theoretical value. The range allowed by the regulation is ± 0.5% , to remain

within the

acceptable ranges ensures that the device does not have adjacent turns shorted

deficiencies cause tensions on the secondary of the transformer or heating.

Notes

Hits

leakage

Painting

Corrosion

Others:

Oil level

Temp. oil:

40

or C

Max. Temp. oil:

55

or C

Temp windings:

ND

Internal pressure

3 psi

Yes

Do not

Yes

Do not

Okay

deteriorated

Yes

Do not

Okay

Low

Phase Tap

V prim. nom. Vsec. nom. Rel. Nom.

Divert relationship.

A 003

34500.0V

480.0V

71,875: 1 999.56V 0.0 ° 0.0 ° 71.9157 13.899057V: 1 0.06% 0.004219A -62.58 °

B 003

34500.0V

480.0V

71875: 1

998.7V 0.0 ° 0.0 ° 13.886845V 71917: 1 0.06% 0.006191A -65.41 °

003 C

34500.0V

480.0V

71,875: 1 1000.15V 0.0 ° 13.907237V ° 71.9158 0.02: 1 0.06% 0.004277A -62.02 °

I prim.

V prim.

Vsec.


Historical Transformation Ratio 11JC561840002.

Figure 12. Historical Relationship Transformation 11JC561840002. It is observed that the transformation ratio has remained very similar over the 3 years

analysis, always within established ranges, close to the theoretical value. It is

concluded that the result of

the test is satisfactory .

3.2.3. Insulation Resistance test 11JC561840002. For the type of configuration of the windings, which corresponds to a

connection Yyn0 , with

primary and secondary neutral united internally, it was possible only proof

determines the resistance between the secondary mass to the primary set. The test was

performed

1000 V DC . In Table 12 values obtained are shown.

To correctly interpret the data, the value of minimum insulation resistance compared

with the measurement (corrected) performed after the first minute. This value

was 1.52 GΩ , exceeding the

calculated theoretical minimum of 0552 GΩ .

Page 27


Table 12. Insulation Resistance 11JC561840002. Regarding the polarization index, an evaluation of the positive insulation is made, and

which is within the range of acceptability corresponding to 1.25 to 2.0 , indicating that

the current

leakage does not increase at a faster rate with increasing voltage, which would

indicate contamination or

insulation damaged; whereas although the rate of absorption was found below 1.4 ,

this

condition is not decisive by itself to identify the condition of the insulation.

Finally, in Figure 13 the graph of resistance against time is observed. In the same

It shows a growing trend throughout the test, sign of an insulation system in good

condition.

Ambient temp:

33.7 ° C

Relative Humidity: 33%

Temp windings:

40 ° C

V dc applied

T (min)

Measured value

Fixed value

Measured value

Fixed value

Measured value

Fixed value

0.25

0.262

1.03

---

---

---

---

0.50

0.325

1.28

---

---

---

---

0.75

0.360

1.42

---

---

---

---

1

0.385

1.52

---

---

---

---

2

0.440

1.74

---

---

---

---

3

0.463

1.83

---

---

---

---

4

0.490

1.94

---

---

---

---

5

0.505

1.99

---

---

---

---

6

0.518

2.05

---

---

---

---

7

0.529

2.09

---

---

---

---

Referring to Fig.

0.539

2.13

---

---

---

---

Referring to Fig.

0.548

2.16

---

---

---

---

10

0.556

2.20

---

---

---

---

Rmin GΩ

IA

IP

1.18

---

---

1.44

---

---

---

---

GΩ

---

---

Connection

Primary + Secondary ground

---

0.552

---

1000

---

---

Page 28


Figure 13. Curve Insulation Resistance vs. 11JC561840002 time. Insulation Resistance historic 11JC561840002.

Figure 14. Insulation Resistance Historical 11JC561840002. erratic behavior in the historical insulation resistance curve shown. In the

Previous test values were obtained near the recommended minimum, but today have

come

to initial values. In this test, the external conditions, such as humidity, temperature,

dust,

among others, may influence the results. It notes that the behavior is similar to

ambos transformadores, con lo que se evidencia el tema de la influencia de estos

agentes externos. A pesar

Page 29


de las variaciones, se observa que los valores están lejos de mínimos recomendados,

por lo que la realidad

actual es que el equipo cuenta con un sistema de aislamiento en perfectas condiciones.

De esta manera, se concluye que el resultado de la prueba es positivo .

3.2.4. Prueba de Resistencia de Devanados 11JC561840002. Dado que los valores de resistencia varían con la temperatura, todas las mediciones

deben

convertirse a una temperatura común para poder ser comparadas e interpretadas

adecuadamente. Because

que la mayoría de pruebas en fábrica se realizan a 75°C , se utiliza ese valor como

referencia. En la Tabla

13 the results of this test, including the setting shown for 75 or C .

Table 13. Windings 11JC561840002 resistance. Higher values are shown in the measurements corresponding to the primary side, that

obtained in the secondary, as expected (due to the greater amount of conductive), but

Note that in both cases there is consistency between phases, with differences not more

than one to 5% , which is

results in no weak points or making poor contact. The most accurate diagnosis is

made to

compare data with factory or previous tests.

H1-H0

H2-H0

H0-H3

X1-X0

X2-X0

X3-X0

I test: N / a

N / a

N / a

6.0A

6.0A

6.0A

V test: N / a

N / a

N / a

0.0019317V

0.0018588V

0.0018099V

R as: 1.151666Ω

1.172239Ω

1.219717Ω

0.00032195Ω

0.0003098Ω

0.00030165Ω

T measurement:

34.2 ° C

34.1 ° C

34.1 ° C

34.3 ° C

34.7 ° C

34.8 ° C

T reference: 75.0 ° C

75.0 ° C

75.0 ° C

75.0 ° C

75.0 ° C

75.0 ° C

R compensated: 1.3262127Ω

1.35040539Ω 1.40509948Ω 0.00037061Ω 0.00035609Ω

0.0003466Ω

Primary winding

Secondary winding

Temperature compensation for Copper:

Page 30


11JC561840002 historic winding resistance.

Figure 15. Primary winding resistance Historical 11JC561840002.

Figure 16. Secondary Winding Resistance Historical 11JC561840002. In general, a behavior with slight variations, consistent between phases is shown,

which is

results in that there is no deterioration in the windings or transformer internal

connections.

It is determined that the status of the transformer with respect to the winding

resistance is

acceptable.

Page 31


3.2.5. Power Factor test 11JC561840002. The test data are summarized in Table 14 .

Table 14. Power Factor 11JC561840002. The value registered power factor is 0.46% , below 1% recommended for

transformers in use. Thus, we can say that the liquid insulation transformer

encounters low humidity and oxidation.

History Insulation Power Factor 11JC561840002.

Historical Figure 17. Insulation Power Factor 11JC561840002. The results obtained in this test have a great difference from the

above, which you can rule out problems in the insulation system equipment. The

results

obtained in 2015, possibly were influenced by some external element when

k

T oil

You too

humidity

relative 0.64

40.0 ° C

35.4 ° C

0.29%

Proof

Test V (V) V output (V) I output (mA)

Frequency

(Hz)

Cp (nF)

PF (%)

Evaluation CH + L

1,000

1,000

6.063949

60

16.087311

0.46%

Acceptable

Compensation

Temperature:

Page 32


the measurement, but the current diagnosis is that the oil is free agents

contaminants.

The test result is acceptable .

3.2.6. Dielectric and Physical-Chemical 11JC561840002 analysis. As shown in Table 15 , the analysis indicates that the oil condition is

normal operation, all variables measured are acceptable, the overall picture of the test

is that

oil is in good physical - chemical conditions.

Table 15. Physical Analysis - Chemical 11JC561840002. History 11JC561840002 Physico-chemical analysis.

Historical Figure 18. Dielectric oil and water content 11JC561840002.

Unity

Measured value

State kV / 2.54mm

47

Acceptable mgKOH / g

0.07

Acceptable 0.915

Acceptable mN / m

33

Acceptable 1.5

Acceptable Any

Acceptable mg / kg (ppm)

88

Acceptable

Proof Dielectric strength

Neutralization number

Specific gravity

Interfacial tension

Color

sediment

Water content

Page 33


Historical Figure 19. Number of Neutralization and Specific Gravity

11JC561840002.

Historical Figure 20. Interfacial Tension and Color 11JC561840002. According to the graphs above, most of the parameters have remained within the

ranges

acceptable, complying with the limits in the 5 study periods with observations

the color is slightly above the ideal. The dielectric strength is maintained near the

boundary

recommended.

After analyzing the behavior of physical and chemical parameters of the oil in 5

registered periods is concluded that the test result is acceptable.

3.2.7. Dissolved Gas Chromatography 11JC561840002. In Table 16 , the gas content identified by the test CDG is.

As it has been happening since the first tests, a significant concentration of noticeable

Acetylene. This is discussed further in historic gases.

Page 34

Field Service Report 3. 4

Table 16. Dissolved Gas Chromatography 11JC561840002. History 11JC561840002 Gas Chromatography. tests conducted in the years listed above are compared.

Historical Figure 21. Gas Chromatography in 11JC561840002 oil.

gases analyzed

Condition Oxygen (O2)

562

-

Nitrogen (N2)

63,200

-

Hydrogen (H2)

84

1

Carbon Monoxide (CO)

260

1

Methane (CH4)

twenty

1

Ethylene (C2H4)

31

1

Ethane (C2H6)

5

1

Acetylene (C2H2)

14

3 Carbon dioxide (CO2)

3,810

2 414

1

Concentration (ppm) SUBTOTAL fuel gases (ppm)

TOTAL GAS (PPM) Condition 1: Normal. Condition 2: Observation. Condition 3: High level, set

trend. Condition 4: excessive decomposition, possible transformer failure.

67.986

Page 35


Figure 22. Historical TGC in 11JC561840002 oil. According to the above two graphs, the acetylene concentration has stabilized,

indicator

that there is a persistent failure on the computer.

After analyzing the behavior of the parameters gas generation in oil

periods available, it is concluded that the test result is acceptable.


4. CONCLUSIONS.

4.1. 11JC561840001 transformer. • a transformer having a correct state of transformation ratio is found,

showing minimal variation from the theoretical value, maintaining the deviation

always within the allowable ranges of ± 0.5% .

• The test results show insulation resistance at acceptable values

Transformer solid insulation, exceeding the recommended minimum.

• resistance values very similar tested windings between phases are obtained,

maintaining consistency in each of the internal connections of the transformer, this

being consistent with test data from previous years, providing a result that

It ensures that no point is weak or lazy.

• Proof of capacitance and power factor yielded values of insulation system

with low levels of oxidation and / or moisture.

• Dielectric physico-chemical and dielectric oil in the transformer conditions

acceptable for four periods analyzed, giving the rating of good oil condition.

• The results of gas chromatography show gas levels within normal, the

overview of the analysis is that the team works free of faults.

4.2. 11JC561840002 transformer. • a transformer having a correct state of transformation ratio is found,

showing minimal variation from the theoretical value, maintaining the deviation

always within the allowable ranges of ± 0.5% .

• The test results show insulation resistance at acceptable values

Transformer solid insulation, exceeding the recommended minimum.

• resistance values very similar tested windings between phases are obtained,

maintaining consistency in each of the internal connections of the transformer, this

being consistent with test data from previous years, providing a result that

It ensures that no point is weak or lazy.

• Proof of capacitance and power factor yielded values of insulation system

with low levels of oxidation and / or humidity, in contrast to previous tests.


• Dielectric physico-chemical and dielectric oil in the transformer conditions

acceptable for five periods analyzed, giving the rating of good oil

condition. Noticeable

the dielectric strength is maintained close to the ideal limit.

• The results of gas chromatography show a large concentration of acetylene,

but the history of gases can identify that there is an increase, therefore, no failure

persistent on the computer. The overview of the analysis is that it operates

satisfactorily.

Page 38


5. Final recommendations. • Periodically review conditions of load and temperature, to thereby identify the

time of occurrence of any malfunction.

• Programming electrical tests to observe any anomalies in the functioning of the

transformers, as changes in output voltages, warm-ups, among others. Should not

occurrence thereof, made each year is recommended to maintain a correct program

preventive maintenance.

• Perform physical and chemical analysis annually to observe the behavior of the

different

oil parameters and thereby detect the deterioration thereof by the work that is

subjected

transformer and perform timely corrective actions.

• Perform chromatographic analysis of dissolved gases in oil at least once a year, so

possible to monitor the rate at which gases are generated, so you can identify potential

internal faults.

Sincerely:

DC. Archive.

Page 39


6. ATTACHMENTS.

6.1. Certificates of calibration of equipment.

6.1.1. Test Equipment Megger S1-1052.

Page 40


Page 41


Page 42


6.1.2. Testing equipment OMICRON CPC 100.

Page 43


Page 44

Field Service Report

44

6.2. Laboratory tests Oils.

Page 45

Field Service Report Four. Five

Page 46


Page 47


field service report eaton electrical services and system ... · pdf fileperiodic tests, both...

Documents