TDT 1047-10
TYPE TEST CERTIFICATE OF TEMPERATURE-RISE PERFORMANCE
OBJECT
A three-phase oil-immersed type distribution transformer
TYPE
875-9708P11
Rated power
Rated voltage
Connection symbol
Rated frequency
SERIAL No.
1-09-109-02-0001
1000 kVA
11 kV ± 2 x 2,5% / 0,433 kV
Dyn11
50 Hz
MANUFACTURER
United Transformers Electric Co.,
Riyadh, Saudi Arabia
CLIENT
United Transformers Electric Co.,
Riyadh, Saudi Arabia
TESTED BY
KEMA HIGH-VOLTAGE LABORATORY
Arnhem, the Netherlands
DATES OF TESTS
8 and 9 April 2010
The object, constructed in accordance with the description, drawings and photographs incorporated in
this Certificate, has been subjected to the series of proving tests in accordance with
IEC 60076-2
This Type Test Certificate has been issued by KEMA following exclusively the STL Guides.
The results are shown in the record of Proving Tests and the oscillograms attached hereto. The
values obtained and the general performance are considered to comply with the above Standard
and to justify the ratings assigned by the manufacturer as listed on page 3.
The Certificate applies only to the object tested. The responsibility for conformity of any object
having the same designations with that tested rests with the Manufacturer.
This Certificate consists of 12 pages in total.
Version: 1
Order No: 70971230
© Copyright: Only integral reproduction of this Certificate is permitted without written
permission from KEMA. Electronic copies in e.g. PDF-format or scanned version of
this Certificate may be available and have the status “for information only”.
The sealed and bound version of the Certificate is the only valid version.
KEMA Nederland B.V.
P.G.A. Bus
KEMA T&D Testing Services
Managing Director
Arnhem, 13 July 2010
-2-
TDT 1047-10
TABLE OF CONTENTS
Version: 1
TABLE OF CONTENTS .......................................................................................................................... 2
1
Identification of the test object......................................................................................................3
1.1
1.2
Ratings assigned by the manufacturer and proved by tests ........................................................3
Description of the test object........................................................................................................3
1.3
List of drawings ............................................................................................................................4
2
2.1
General information......................................................................................................................5
The tests were witnessed by........................................................................................................5
2.2
The tests were carried out by.......................................................................................................5
2.3
2.4
Purpose of the test .......................................................................................................................5
Measurement uncertainty.............................................................................................................5
2.5
Applicable standards and sequence of tests ...............................................................................5
3
Temperature-rise test ...................................................................................................................6
3.1
3.2
Readings taken after total losses injection (in steady-state condition) ........................................6
Readings taken after 1 hour rated current injection .....................................................................7
3.3
3.4
Cooling-down curves taken after switch-off .................................................................................7
Calculation of average winding temperature-rise.........................................................................8
3.5
Requirements and results ............................................................................................................8
APPENDIX A
MEASUREMENT UNCERTAINTIES........................................................................... 9
APPENDIX B
MANUFACTURER’S DRAWINGS ............................................................................ 10
-3-
1
IDENTIFICATION OF THE TEST OBJECT
1.1
Ratings assigned by the manufacturer and proved by tests
Rated power
Rated primary voltage
1000
11
kVA
kV
Rated secondary voltage
Rated primary current
433
52,5
V
A
Rated secondary current
1333
A
Rated frequency
1.2
Hz
Description of the test object
Manufacturer
Version: 1
50
Designation
United Transformers Electric Co.,
Riyadh, Saudi Arabia
1000 kVA
Serial number
Year of manufacture
1-09-109-02-0001
2009
Number of phases
3
Insulation levels
- HV winding
75 / 28 kV
- LV winding
Tapping range
- / 3 kV
± 2 x 2,5%
Number of tappings
Impedance voltage
5
5,45%
Connection symbol
Dyn11
Type of cooling
Primary winding material
ONAN
Cu
Secondary winding material
Reference temperature
Cu
75 °C
TDT 1047-10
-4-
1.3
TDT 1047-10
List of drawings
The manufacturer has guaranteed that the object submitted for tests has been manufactured in
accordance with the following drawings.
KEMA has verified that these drawings adequately represent the object tested.
The following drawings are included in this Certificate.
875-9708 P11 Rev. O
721-9708 P11 Rev. O
Version: 1
The following drawings are kept in KEMA’s files and are listed for reference only.
400-0052E
Rev. B
850-0004 P
Rev. B
061-0392P
Rev. O
061-9708P
Rev. O
040-7041P
Rev. O
040-8072P
Rev. O
939-9708P11
Rev. O
105-0921E
Rev. O
-5-
2
GENERAL INFORMATION
2.1
The tests were witnessed by
TDT 1047-10
The tests have not been witnessed.
2.2
The tests were carried out by
Name
Company
Smeenk, S.
Jansen, B.
KEMA High-Voltage Laboratory,
Arnhem, The Netherlands
2.3
Purpose of the test
Purpose of the test was to verify whether the material complies with the specified requirements.
2.4
Measurement uncertainty
A table with measurement uncertainties is enclosed in appendix A. Unless otherwise indicated in the
report, the measurement uncertainties of the results presented are as indicated in this table.
2.5
Applicable standards and sequence of tests
When reference is made to a standard and the date of issue is not stated, this applies to the latest
issue including amendments, which have been officially published prior to the date of the tests.
Version: 1
The sequence of the tests can be derived from the indicated dates and does not necessarily follow the
sequence of presentation.
-6-
3
TDT 1047-10
TEMPERATURE-RISE TEST
Standard and date
Standard
Test date
IEC 60076-2, clause 5.2.2
8 and 9 April 2010
Environmental conditions
Ambient temperature
Temperature of test object
20
20
°C
°C
Ambient air pressure
Humidity
1023
4
hPa
3
g/m
Initial transformer data (in principal tapping position: 3)
DC-resistance between terminals B and C
DC-resistance between terminals b and c
No-load losses
Load losses
Total losses
Rated current
3.1
Rdc-HV
Rdc-LV
P0
Pcu
Ptot
In
864,5
1,366
1341
9800
11141
52,49
mΩ
mΩ
W
W
W
A
(75 °C)
Readings taken after total losses injection (in steady-state condition)
sensor no. top oil (a)
(°C)
1
59,39
ambient (a) bottom oil (a)
(°C)
(°C)
20,45
38,90
for information only
phase
voltages
(V)
2
3
4
59,46
20,48
20,45
38,50
U
V
W
average
average
59,43
20,46
38,70
668
666
670
668
currents
(A)
losses
(W)
56,0
55,9
56,0
56,0
total
3688
3762
3685
11135
calculation of top oil and average oil temperature-rise
top oil temperature-rise
∆ θ top (a) = θ top (a) - θ amb (a)
average oil temperature-rise (a)
∆ θ oil (a) = ((θ top (a) + θ bot (a)) / 2) - θ amb (a)
Version: 1
(20,2 °C)
(20,2 °C)
39,0
28,6
K
K
-7-
3.2
Readings taken after 1 hour rated current injection
sensor no.
1
2
3
4
average
top oil (b)
(°C)
61,02
61,08
ambient (b)
(°C)
21,55
21,62
21,57
bottom oil (b)
(°C)
40,40
40,40
61,05
21,58
40,40
calculation of average oil temperature
average oil temperature (b)
3.3
TDT 1047-10
for information only
phase
voltages
(V)
U
623
V
626
W
626
average 625
currents
(A)
52,4
52,3
52,4
52,4
total
θ oil (b) = ((θ top (b) + θ bot (b)) / 2) - θ amb (b)
losses
(W)
3299
3318
3146
9763
50,73
K
Cooling-down curves taken after switch-off
temperature [°C]
All Cooling Down Curves
75
74
73
72
3
2
y = -0,0018x + 0,07x - 1,5298x + 71,398
71
70
69
68
67
66
65
64
3
2
63 y = -0,0056x + 0,1693x - 2,1866x + 69,923
62
61
60
59
58
57
56
55
0
1
2
3
4
5
6
7
8
9
10
time [min]
HV Winding
LV Winding
Version: 1
extrapolated absolute winding temperatures immediately after switch-off
high voltage winding
θ HV
low voltage winding
θ LV
71,40
69,92
°C
°C
-8-
3.4
TDT 1047-10
Calculation of average winding temperature-rise
average temperature difference winding-oil
high voltage winding
∆ θ HV (cor) = θ HV - θ oil (b)
low voltage winding
∆ θ LV (cor) = θ LV - θ oil (b)
20,7
19,2
°C
°C
average winding temperature-rise
high voltage winding
low voltage winding
49,3
47,8
K
K
3.5
∆ θ HV = ∆ θ HV (cor) + ∆ θ oil (a)
∆ θ LV = ∆ θ LV (cor) + ∆ θ oil (a)
Requirements and results
item
determined
top oil temperature-rise
average winding temperature-rise HV winding
average winding temperature-rise LV winding
(K)
39
49
48
∆ θ top
∆ θ HV
∆ θ LV
guaranteed
value
(K)
≤ 45
≤ 50
≤ 50
requirement
IEC 60076-2
(K)
≤ 60
≤ 65
≤ 65
Version: 1
Result
The top oil temperature-rise and the average winding temperature-rises of the windings are in
compliance with the requirements.
-9-
APPENDIX A
TDT 1047-10
MEASUREMENT UNCERTAINTIES
The measurement uncertainties in the results presented are as specified below unless otherwise
indicated.
measurement
measurement uncertainty
dielectric tests
peak value: ≤ 3%
and impulse current tests
time parameters: ≤ 10%
capacitance measurement
0,3%
tan δ measurement
± 0,5% ± 5x10
-5
partial discharge measurement
< 10 pC
10
: 2 pC
- 100 pC : 5 pC
> 100 pC :20%
measurement of impedance
ac-resistance measurement
≤ 1%
measurement of losses
≤ 1%
measurement of insulation resistance
≤ 10%
measurement of dc resistance
1 µΩ
- 5 µΩ
: 1%
5 µΩ
- 10 µΩ
: 0,5%
10 µΩ - 200 µΩ : 0,2%
radio interference test
2 dB
calibration of current transformers
2,2 x 10 Ii/Iu and 290 µrad
calibration of voltage transformers
1,6 x 10 Ui/Uu en 510 µrad
measurement of conductivity
5%
measurement of temperature
-50 °C - -40 °C : 3 K
-40 °C - 125 °C : 2 K
-4
-4
125 °C - 150 °C : 3 K
tensile test
sound level measurement
1%
type 1 meter as per IEC 651 and
ANSI S1.4.1971
Version: 1
measurement of voltage ratio
0,1%
-10-
APPENDIX B
TDT 1047-10
MANUFACTURER’S DRAWINGS
Version: 1
2 pages
drawing no.
description/title
date
rev.
875-9708 P11
General arrangement drawing 1000 kVA, 11 / 0,433 kV, 50
Hz ground mounted transformer type
20-06-09
O
721-9708 P11
Rating & diagram plate 1000 kVA, 11 / 0,433 kV, 50 Hz
20-06-09
O
Version: 1
-11-
TDT 1047-10
Version: 1
-12-
TDT 1047-10