test report pre ing desh energy tr 01
TRANSCRIPT
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8/3/2019 Test Report PRE ing DESH ENERGY TR 01
1/13
ENERGYPACR
E N E R G Y P A C E N G I N E E R I N G L T D.
DEPARTMENT OF RESEARCH & DEVELOPMENT
REF : EELF/TR- DESH- 35 MVA
REV : 00
DA TE : 12 / 12 /2010
P R E - C O M M IS S IO N I N G T E S T R E P O R T
TRANSFORMER 01
Name of the Client : DESH ENERGYLTD.
Job Description : 35 MVA, 11/132 KV, 3-phase, 50Hz, Power Transformer
Preference Standard : BS-171, IEC-76
Test Performed by : Engr. Rashiduzzaman Bulbul (Asstt. Engr., XFR, Testing)Engr. Mamun Biswas (Asstt. Engr., XFR, R&D)
Reviewed By : Engr. Faruk Hannan Raju (Sr. Engr., R&D)
Testing Duration : 08/12/2010 - 09/12/2010
Date of Issue :
Remarks
Test results are in conformance with contractual requirements.
Prepared By Mamun Biswas
Checked By Faruk Hannan
Testing Engr. Rashiduzzaman
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8/3/2019 Test Report PRE ing DESH ENERGY TR 01
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ENERGYPACR
E N E R G Y P A C E N G I N E E R I N G L T D.
DEPARTMENT OF RESEARCH & DEVELOPMENT
REF : EELF/TR- DESH- 35 MVA
REV : 00
DA TE : 12 / 12 /2010
C O N T E N T S
1 PHYSICAL INSPECTIONS
1.1 Inspection for Transformer condition on arrival at site
1.2 Inspection for Transformer Accessories
2. T E S T I T E M S
2.1 Magnetic Balance test2.2 Measurement of excitation current
2.3 Vector group test
2.4 Measurement of voltage ratio
2.5 Measurement of winding insulation resistance
Prepared By Mamun Biswas
Checked By Faruk Hannan
Testing Engr. Rashiduzzaman
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8/3/2019 Test Report PRE ing DESH ENERGY TR 01
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ENERGYPACR
E N E R G Y P A C E N G I N E E R I N G L T D.
DEPARTMENT OF RESEARCH & DEVELOPMENT
REF : EELF/TR- DESH- 35 MVA
REV : 00
DA TE : 12 / 12 /2010
1.1 Inspection for Transformer Condition on arrival at site
1. Explanation and criteria
1.1. Check for Damage: check the state of damage if the Transformer was dropped accidentally,
or reinforcement o& piping were distorted.
1.2. Rust : when the painting is damaged or the metal parts are rusted, remove the rust with sand
paper and coat with the appropriate paint.
1.3. Bolts & Nuts: check weather the bolts & Nuts are loosened or not.
Note: for any serious damaged the matter should be immediately informed to Energypac
Engineering Ltd.
2. Checking Result
Check Item Date Results Remarks
External Damage 08/12/2010 None Good
Rust 08/12/2010 None Good
Bolts & Nuts 08/12/2010 Tightened Good
Oil leakage 08/12/2010 none Good
RESULT : Satisfactory_______
Prepared By Mamun Biswas
Checked By Faruk Hannan
Testing Engr. Rashiduzzaman
Page 3 of 13
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ENERGYPACR
E N E R G Y P A C E N G I N E E R I N G L T D.
DEPARTMENT OF RESEARCH & DEVELOPMENT
REF : EELF/TR- DESH- 35 MVA
REV : 00
DA TE : 12 / 12 /2010
1.2 Transformer Rating Sheet
Apparatus : 35 MVA, 11/132 kV Transformer
Voltage ratio : 11/132 kV
Number of Phase(s) : 3 (Three)
Rated Frequency : 50 Hz
Vector Group : YNd1
Type of Cooling : ONAN / ONAF
Tapping Range : + 10 % to 20 % in steps of 1.25 % provided onHV winding.
Type of Tap Changer : ON-Load Tap Changer
Winding Designation : HV LV
Terminal Notation : A B C N a b c
Rated Capacity in MVA
ONAF : 35
Connections : Star Delta
Rated Voltage (in kV) : 132 11Rated Current (in Ampere) :
ONAF : 153.1 1837
Insulation level (in kV)
HV Winding : LI 650 kV, AC 275 kV
HV-N Winding : LI 325 kV, AC 140 kV
LV W inding : LI 75 kV, AC 28 kV
LV Voltage : 11000 Volts in all Tap Positions.
Prepared By Mamun Biswas
Checked By Faruk Hannan
Testing Engr. Rashiduzzaman
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ENERGYPACR
E N E R G Y P A C E N G I N E E R I N G L T D.
DEPARTMENT OF RESEARCH & DEVELOPMENT
REF : EELF/TR- DESH- 35 MVA
REV : 00
DA TE : 12 / 12 /2010
1.3 Visual check of accessories
Name of accessories Result Date
High voltage line bushing (A Phase) GOOD 08/12/2010
High voltage line bushing (B Phase) GOOD 08/12/2010
High voltage line bushing (C Phase) GOOD 08/12/2010
Neutral bushing GOOD 08/12/2010
Low voltage bushing (a phase) GOOD 08/12/2010
Low voltage bushing (b phase) GOOD 08/12/2010
Low voltage bushing (c phase) GOOD 08/12/2010Radiators GOOD 08/12/2010
Conservator GOOD 08/12/2010
Cooling fan GOOD 08/12/2010
Valves GOOD 08/12/2010
Oil level indicator for OLTC GOOD 08/12/2010
Buchholz relay GOOD 08/12/2010
Dehydrating breather GOOD 08/12/2010
Prepared By Mamun Biswas
Checked By Faruk Hannan
Testing Engr. Rashiduzzaman
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8/3/2019 Test Report PRE ing DESH ENERGY TR 01
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ENERGYPACR
E N E R G Y P A C E N G I N E E R I N G L T D.
DEPARTMENT OF RESEARCH & DEVELOPMENT
REF : EELF/TR- DESH- 35 MVA
REV : 00
DA TE : 12 / 12 /2010
TEST ITEMS
2.1 Magnetic Balance Test
PROCEDURE:
The following procedures are followed during magnetic balance check:1) Single phase supply (220v) is applied across one phase.
2) Voltage is measured from the other two phase.
For A-phase, when single phase voltage is applied in A-phase, flux A is produced. A will induce flux
B and C phase and for this,voltage will be generated at B & C phase.
A c
So,
A =B + C.OR, NIA/RA =NIB/RB +NIC/RC
As Rc > RB , c < B.
Prepared By Mamun Biswas
Checked By Faruk Hannan
Testing Engr. Rashiduzzaman
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8/3/2019 Test Report PRE ing DESH ENERGY TR 01
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ENERGYPACR
E N E R G Y P A C E N G I N E E R I N G L T D.
DEPARTMENT OF RESEARCH & DEVELOPMENT
REF : EELF/TR- DESH- 35 MVA
REV : 00
DA TE : 12 / 12 /2010
So voltage induced in the C phase must be less than the voltage induced in phase B.
That is, VBN > VCN. Criteria 1.
For a balance 3 phase circuit,
VAN + VBN + VCN = 0
VAN = -( VBN + VCN)criteria 2.
So the sum of the voltage induced on the two phases should be almost equal to the applied voltage on the
3rd phase.
PHASE C:
THE SAME RESULT WILL BE OBTAINED WHILE APPLYING VOLTAGE IN THE C-
PHASE.
For C-phase,
VcN= -( VBN + VAN).
PHASE B:
FOR B-phase, as B is the middle phase, the flux induced by B, will be equally divided and A &
C phase will be induced equally. So,
B =C + A.OR, NIB/RB =NIC/RC +NIA/RA
Accordingly, VBN= -( VCN + VAN).
The above theory is verified in the test results given on the next page.
Prepared By Mamun Biswas
Checked By Faruk Hannan
Testing Engr. Rashiduzzaman
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8/3/2019 Test Report PRE ing DESH ENERGY TR 01
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ENERGYPACR
E N E R G Y P A C E N G I N E E R I N G L T D.
DEPARTMENT OF RESEARCH & DEVELOPMENT
REF : EELF/TR- DESH- 35 MVA
REV : 00
DA TE : 12 / 12 /2010
MAGNETIC BALANCE (TEST DATA) :
a) Input Voltage in = 234 V
Voltage across < N-B > = 182 V
Voltage across < N-C > = 52 V
b) Input Voltage in < N - B > = 234 VVoltage across < N-A > = 62 V
Voltage across < N-C > = 175 V
c) Input Voltage in < N - C > = 238 VVoltage across < N-A > = 18 V
Voltage across < N-B > = 221 V
From the test data, the magnetic circuit is confirmed as a balanced circuit.
Result: ___________Magnetic circuit is well balanced_________
** Voltage measured by FLUKE-189Digital Meter, manufactured by FLUKE,USA.
** Current measured by KYORITSU-2431 milli amps Meter, by kyoritsu, japan.
Prepared By Mamun Biswas
Checked By Faruk Hannan
Testing Engr. Rashiduzzaman
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8/3/2019 Test Report PRE ing DESH ENERGY TR 01
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ENERGYPACR
E N E R G Y P A C E N G I N E E R I N G L T D.
DEPARTMENT OF RESEARCH & DEVELOPMENT
REF : EELF/TR- DESH- 35 MVA
REV : 00
DA TE : 12 / 12 /2010
2.2 Measurement of Excitation current
3-phase Supply from HV side
Measured Voltage A-B : 407 V, Measured current : IA = 5.6 mA
Measured Voltage B-C : 409 V, Measured current : IB = 2.4 mA
Measured Voltage C-A : 409 V, Measured current : IC = 4.03 mA
Result: Excitation current is on normal magnitude & Balanced
** Voltage measured by FLUKE-189Digital Meter, manufactured by FLUKE,USA
** Current measured by KYORITSU-2431 milli amps Meter, by kyoritsu, japan.
Prepared By Mamun Biswas
Checked By Faruk Hannan
Testing Engr. Rashiduzzaman
Page 9 of 13
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8/3/2019 Test Report PRE ing DESH ENERGY TR 01
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ENERGYPACR
E N E R G Y P A C E N G I N E E R I N G L T D.
DEPARTMENT OF RESEARCH & DEVELOPMENT
REF : EELF/TR- DESH- 35 MVA
REV : 00
DA TE : 12 / 12 /2010
2.3 Vector Group Test
PROCEDURE:
There are few method of testing of vector group of a particular powerType equation
here.transformer. Among those one is to assume a vector group first and then perform the test
accordingly. If the test result matches the assumption then the vector group is proved. If it doesnt then a
new assumption is made.
The vector group of 30/35-11 transformer is found as YNd1 in the name plate. So we
assume that the vector group is YNd1 and then perform the following test.
Step 1: 3 phase supply is applied on the HT side.
A
a
c
C b B
Step 2: C and c is shorted. Then the vector diagram turns into the following:
A
a
c,C B
b
Vectorially. Voltage of Aa=Bb=Ba
And Ab is greater than all other voltage.
So. Ab> Aa=Ba=Bb..(1)
Step 3: measurement is performed to record the magnitude of Ab,Aa,Ba,Bb, comparison is done
according to 1.
The above procedures are followed below:
Prepared By Mamun Biswas
Checked By Faruk Hannan
Testing Engr. Rashiduzzaman
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ENERGYPACR
E N E R G Y P A C E N G I N E E R I N G L T D.
DEPARTMENT OF RESEARCH & DEVELOPMENT
REF : EELF/TR- DESH- 35 MVA
REV : 00
DA TE : 12 / 12 /2010
TEST DATA:
Terminals Cand c shorted together.
Voltage applied across the terminals A-B- C = 410V, AC
Voltage measured across : Terminal A b = 414 V
TerminalA a = 374 V
TerminalBb = 376 V
TerminalB a = 375 V
As the terminal voltage across Bb = A a =B a and A-b> Voltage acrossAll OtherTerminals,
The Vector Group Test is confirmed as YNd1.
Result: _____________Vector group is ok____
** Voltage measured by FLUKE-189Digital Meter, manufactured by FLUKE,USA.
Prepared By Mamun Biswas
Checked By Faruk Hannan
Testing Engr. Rashiduzzaman
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8/3/2019 Test Report PRE ing DESH ENERGY TR 01
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ENERGYPACR
E N E R G Y P A C E N G I N E E R I N G L T D.
DEPARTMENT OF RESEARCH & DEVELOPMENT
REF : EELF/TR- DESH- 35 MVA
REV : 00
DA TE : 12 / 12 /2010
2.4 Measurement of voltage ratio
Tap
Position
HT
Voltage
LT
Voltage
ACTUAL
RATIO
Measured RATIO
Phase-A Phase-B Phase-C
1 145200 11000 7.621 7.659 7.652 7.650
2 143550 11000 7.534 7.570 7.564 7.564
3 141900 11000 7.447 7.482 7.475 7.475
4 140250 11000 7.361 7.393 7.387 7.388
5 138600 11000 7.274 7.306 7.298 7.299
6 136950 11000 7.188 7.215 7.211 7.2107 135300 11000 7.101 7.128 7.123 7.122
8 133650 11000 7.014 7.035 7.034 7.034
9 132000 11000 6.928 6.951 6.946 6.945
10 130350 11000 6.841 6.862 6.857 6.856
11 128700 11000 6.754 6.773 6.769 6.769
12 127050 11000 6.668 6.685 6.680 6.681
13 125400 11000 6.581 6.598 6.592 6.592
14 123750 11000 6.495 6.509 6.503 6.504
15 122100 11000 6.408 6.420 6.416 6.416
16 120450 11000 6.321 6.332 6.328 6.32817 118800 11000 6.235 6.244 6.239 6.239
18 117150 11000 6.148 6.155 6.151 6.151
19 115500 11000 6.062 6.068 6.063 6.064
20 113850 11000 5.975 5.979 5.976 5.975
21 112200 11000 5.888 5.891 5.888 5.887
22 110550 11000 5.802 5.803 5.798 5.797
23 108900 11000 5.715 5.714 5.710 5.710
24 107250 11000 5.629 5.627 5.622 5.622
25 105600 11000 5.542 5.538 5.534 5.534
Remarks: The voltage ration between HT & LT side of the transformer for every TAP POSITION isOK. The vector group of this transformer is YNd1
** Measured by Vanguard Turn Ratio Meter (Model: ATRT-03, S/N-18661)
Manufactured by Vanguard Instrument Co., Inc.
** Calibrated by Cali-Labs Pv. Ltd., Bhopal, India
Prepared By Mamun Biswas
Checked By Faruk Hannan
Testing Engr. Rashiduzzaman
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ENERGYPACR
E N E R G Y P A C E N G I N E E R I N G L T D.
DEPARTMENT OF RESEARCH & DEVELOPMENT
REF : EELF/TR- DESH- 35 MVA
REV : 00
DA TE : 12 / 12 /2010
2.5 Measurement of winding Insulation Resistance
Test Voltage = 5kVMean Transformer Oil Temperature = 30 C
Measured
After
Insulation Resistance (Giga Ohms) Remarks
HV E LV E HV LV
15 Sec. 9.12 4.60 8.35 Good
60 Sec. 13.10 7.40 11.50 Good
DAR 1.43 1.60 1.37 Good
Result:________Satisfactory_______
** Insulation Resistance measured by 5kV ElectronicBM !4Mega-ohm Meter & 5 kV Megger
manufactured by Megger Industries Ltd., England.
Prepared By Mamun Biswas
Checked By Faruk Hannan
Testing Engr. Rashiduzzaman
Page 13 of 13