TYPE TEST CERTIFICATE OF SHORT-CIRCUIT PERFORMANCE · TYPE TEST CERTIFICATE OF SHORT-CIRCUIT PERFORMANCE ... IEC 60076-5 This Type Test Certificate has been issued by KEMA following

F1-1

4

168-08

TYPE TEST CERTIFICATE OF SHORT-CIRCUIT PERFORMANCE

APPARATUS A three-phase outdoor oil-immersed distribution transformer

DESIGNATION 1000 kVA SERIAL No. 1-08-112-01-0001

Rated power 1000 kVA Rated voltage 11 kV ± 2 x 2,5% / 433 V Connection symbol Dyn11 Rated frequency 50 Hz

MANUFACTURER United Transformers Electric Co., Riyadh, Saudi Arabia

TESTED FOR United Transformers Electric Co., Riyadh, Saudi Arabia

TESTED BY KEMA HIGH-POWER LABORATORY and HIGH-VOLTAGE LABORATORY Utrechtseweg 310 - 6812 AR Arnhem - The Netherlands

DATE(S) OF TESTS 15 to 29 October 2008

The apparatus, 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 60076-5 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 with respect to the dynamic ability to withstand short-circuits.

This Certificate applies only to the apparatus tested. The responsibility for conformity of any apparatus having the same designations with that tested rests with the Manufacturer. This Certificate consists of 40 sheets in total. This Certificate falls under the scope of the accreditation certificates L 020 and L 218 of the Dutch Council for Accreditation. See information sheet (page 2). © 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, 17 December 2008

Ver

sion

: 1

Page 2 1 Certificate A Certificate contains a record of a series of type tests carried out strictly in accordance with a recognized standard. The equipment tested has fulfilled the requirements of this standard and the relevant ratings assigned by the manufacturer are endorsed by KEMA. The Certificate is applicable only to the equipment tested. KEMA is responsible for the validity and the contents of the Certificate. The responsibility for conformity of any apparatus having the same designation as the one tested rests with the manufacturer. The Certificate contains the essential drawings and a description of the equipment tested. Detailed rules are given in KEMA's Certification procedure.

2 Report of Performance A Report of Performance contains a record of one or more tests which have been carried out according to the client's instructions. These tests are not necessarily in accordance with a recognized standard. The test results do not verify ratings of the test object.

KEMA issues three types of Reports of Performance:

2.1 The tests have been carried out strictly in accordance with …. The apparatus has complied with the relevant requirements.

This sentence will appear on the front page of a Report of Performance if the tests have been performed in accordance with a recognized standard, but the series of tests does not completely fulfil the requirements for a Certificate of Compliance (for example, if the number of test duties is not a complete series of type tests). The Report contains verified drawings and a description of the equipment tested. Detailed rules are given in KEMA's Certification procedure. The condition of the test object after the tests is assessed and recorded in the Report.

2.2 The tests have been carried out in accordance with the client's instructions. Test procedure and test parameters were based on ....

This sentence will appear on the front page of a Report of Performance if the number of tests, the test procedure and the test parameters are based on a recognized standard and related to the ratings assigned by the manufacturer. If the apparatus does not pass the tests such behaviour will be mentioned on the front sheet. Verification of the drawings (if submitted) and assessment of the condition after the tests is only done on the client's request.

2.3 The tests have been carried out according to the client's instructions.

This sentence will appear on the front page of a Report of Performance if the tests, test procedure and/or test parameters are not in accordance with a recognized standard.

3 Standards 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.

4 Official and uncontrolled test documents The official test documents of KEMA High-Power Laboratory are issued in bound form. Uncontrolled copies may be provided as loose sheets or as a digital file for convenience of reproduction by the client. The copyright has to be respected at all times.

5 Accuracy of measurement In the table of test results the measured quantities are given in three digits. This method of presentation does not indicate an accuracy. The guaranteed uncertainty in the figures mentioned, taking into account the total measuring system, is less than 5%, unless mentioned otherwise.

6 Qualified by RvA (Dutch Council for Accreditation) KEMA High-Power Laboratory and High-Voltage Laboratory have been entered in the RvA-register for laboratories under resp. Nrs. L 020 and L 218 for the testing services as defined in the Field of Accreditation. The accreditation is carried out in accordance with ISO/IEC 17025.

168-08 INFORMATION SHEET

M4

Ver

sion

: 1

Page 3

TABLE OF CONTENTS:

INFORMATION SHEET .................................................................................................................................2

IDENTIFICATION OF THE APPARATUS TESTED......................................................................................4 Ratings assigned by the manufacturer .......................................................................................................4 Description of apparatus tested ..................................................................................................................4 List of drawings ...........................................................................................................................................4

GENERAL INFORMATION............................................................................................................................5 The tests were witnessed by.......................................................................................................................5 The tests were observed by........................................................................................................................5 The transformer was inspected by..............................................................................................................5

LEGEND.........................................................................................................................................................6

SUMMARY OF TESTS ..................................................................................................................................7

REACTANCE MEASUREMENT OVERVIEW ...............................................................................................9

DUTY: Routine tests before short-circuit tests ....................................................................................10 Tests 081015 ............................................................................................................................................10

DUTY: Short-circuit tests......................................................................................................................15 Test circuit.................................................................................................................................................16 Calculation sheet short-circuit current ......................................................................................................17 Photograph before test .............................................................................................................................18 Tests 081024-6017 to 6019, 6021 to 6023, 6025 to 6027........................................................................19

CONDITION AFTER TEST ..........................................................................................................................28 Photograph after test ................................................................................................................................29

DUTY: Routine tests after short-circuit tests .......................................................................................30 Tests 081028 ............................................................................................................................................30

INSPECTION / CONCLUSION ....................................................................................................................35 Photographs during inspection .................................................................................................................36

DRAWINGS..................................................................................................................................................39

168-08 TABLE OF CONTENTS

G1

Ver

sion

: 1

Page 4

RATINGS/CHARACTERISTICS ASSIGNED BY THE MANUFACTURER Voltage 11 kV ± 2 x 2,5% / 433 V Power 1000 kVA Current 52,5 / 1333 A Short-circuit impedance 5,67 % X Connection symbol Dyn11 Cooling method ONAN Frequency 50 Hz X Category I Apparent system power 500 MVA X = This rating has been proved by the tests of this Certificate. DESCRIPTION OF APPARATUS TESTED A three-phase outdoor oil-immersed distribution transformer LIST OF DRAWINGS The manufacturer has guaranteed that the equipment submitted for tests has been manufactured in accordance with the following drawings. KEMA has verified that these drawings adequately represent the equipment tested. The following drawings have been included in this Certificate: 875-9777 P11 Rev. B 721-9777 P Rev. 0 The following drawings are only listed for reference and are kept in KEMA’s files: 400-9777U11 Rev. 0 400-0052 E Rev. 0 265-9777U12 Rev. A 061-0389 P Rev. A 105-9777U81 Rev. 0 105-0907 D00 Rev. 0 939-9777 P11 Rev. A 124-4071 P Rev. B 124-4072 P Rev. A 040-7041 P Rev. 0 040-7060 P Rev. A 850-0004 P Rev. A 842-7001 P Rev. 0 280-0013 P Rev. 0 902-0051 P Rev. 0 901-0133 P Rev. A

168-08 IDENTIFICATION OF THE APPARATUS TESTED

G2-

14-1

V

ersi

on: 1

Page 5 THE TESTS WERE WITNESSED BY Name Company

Abdul Hafeez, S.

United Transformers Electric Co., Riyadh, Saudi Arabia

THE TESTS WERE OBSERVED BY Name Company

Bannink, H. KEMA High-Power Laboratory, Arnhem, The Netherlands Koevoets, R.C.A.M. KEMA High-Voltage Laboratory, Gruntjes, R.J.B. Arnhem, The Netherlands THE TRANSFORMER WAS INSPECTED BY Name Company

Dobbe, N. KEMA High-Power Laboratory, Arnhem, The Netherlands

168-08 GENERAL INFORMATION

G3

Ver

sion

: 1

Page 6 PHASE INDICATIONS If more than one phase is recorded on oscillogram, the phases are indicated by the digits 1, 2 and 3. These phases 1, 2 and 3 correspond to the phase values in the columns of the accompanying table, respectively from left to right. EXPLANATION OF THE LETTER SYMBOLS AND ABBREVIATIONS ON THE OSCILLOGRAMS pu Per unit (the reference length of one unit is represented by the black bar on the oscillogram) I1pri Primary current transformer I1sec Secondary current transformer I2pri Primary current transformer I2sec Secondary current transformer I3pri Primary current transformer I3sec Secondary current transformer Itank Tank current test object U1S Supply voltage U2S Supply voltage U3S Supply voltage Uprot Protection signal

168-08 LEGEND

G4

Ver

sion

: 1

Page 7 168-08 SUMMARY: Short-circuit tests

Test no. 0810246017

0810246018

0810246019

081024 6021

0810246022

0810246023

Tap position 1 1 1 3 3 3 C kV 6,63 6,64 6,67 6,48 6,53 6,55 Voltage, phase value, beginning B kV 6,67 6,70 6,72 6,51 6,57 6,58 A kV 6,57 6,61 6,64 6,44 6,50 6,50 C kV 6,61 6,63 6,65 6,47 6,51 6,51 Voltage, phase value, end B kV 6,65 6,67 6,70 6,49 6,54 6,54 A kV 6,57 6,60 6,63 6,41 6,47 6,47 C A 1679 -1667 1688 1838 -1840 1845 Current HV-winding, peak value B A 1279 -1290 1250 -1772 1780 -1806 A A -1775 1790 -1757 -1308 1309 -1296 C A 783 783 785 843 851 851 Current HV-winding, phase value, beginning B A 776 778 780 845 852 851 A A 772 777 776 839 846 847 C A 777 780 780 843 850 850 Current HV-winding, phase value, end B A 773 776 778 840 845 845 A A 767 772 771 836 842 843 C A 781 782 783 841 848 848 Current HV-winding, phase value, average B A 775 777 779 844 850 850 A A 770 775 774 837 844 845 C kA 48,7 -48,5 48,5 40,8 -40,9 40,7 Current LV-winding, peak value B kA -36,1 35,7 -36,9 -49,1 49,1 -49,6 A kA -42,2 42,1 -41,5 37,0 -37,5 38,1 C kA 20,7 20,7 20,8 21,3 21,5 21,5 Current LV-winding, phase value, beginning B kA 21,4 21,4 21,5 22,1 22,3 22,3 A kA 20,6 20,6 20,7 21,5 21,7 21,7 C kA 20,5 20,6 20,6 21,3 21,4 21,5 Current LV-winding, phase value, end B kA 21,2 21,3 21,4 22,0 22,1 22,1 A kA 20,6 20,7 20,7 21,4 21,5 21,5 C kA 20,6 20,7 20,7 21,3 21,4 21,5 Current LV-winding, phase value, average B kA 21,3 21,4 21,4 22,1 22,2 22,2 A kA 20,6 20,6 20,7 21,4 21,6 21,6 Current duration s 0,510 0,509 0,514 0,505 0,506 0,501 C Ω 16,59 16,65 16,68 14,95 14,99 14,99 Reactance after test B Ω 16,71 16,78 16,81 15,02 15,05 15,05 A Ω 16,62 16,65 16,68 14,89 14,92 14,92

REMARKS

081024-6017 No visible disturbance. Reactances measured between resp. A-C, B-C, A-B.






Ver

sion

: 1

Page 8 168-08 SUMMARY: Short-circuit tests

SUMMARY (continued)

Test no. 0810246025

0810246026

0810246027

Tap position 5 5 5 C kV 5,95 5,96 5,96 Voltage, phase value, beginning B kV 6,00 6,00 6,00 A kV 5,92 5,92 5,91 C kV 5,95 5,94 5,94 Voltage, phase value, end B kV 5,98 5,99 5,99 A kV 5,91 5,91 5,92 C A -1365 1365 -1350 Current HV-winding, peak value B A 2000 -2001 1982 A A -1986 1990 -1984 C A 886 888 888 Current HV-winding, phase value, beginning B A 881 882 882 A A 878 881 878 C A 887 888 888 Current HV-winding, phase value, end B A 878 879 879 A A 875 878 875 C A 886 888 888 Current HV-winding, phase value, average B A 881 881 881 A A 877 881 877 C kA 39,1 -39,1 39,5 Current LV-winding, peak value B kA 42,5 -42,5 42,1 A kA -51,2 50,6 -50,8 C kA 21,3 21,3 21,3 Current LV-winding, phase value, beginning B kA 21,8 21,8 21,9 A kA 21,3 21,2 21,3 C kA 21,2 21,2 21,3 Current LV-winding, phase value, end B kA 21,9 21,9 21,9 A kA 21,2 21,2 21,2 C kA 21,3 21,3 21,3 Current LV-winding, phase value, average B kA 21,8 21,8 21,8 A kA 21,3 21,2 21,3 Current duration s 0,510 0,500 0,513 C Ω 13,10 13,13 13,13 Reactance after test B Ω 13,16 13,16 13,16 A Ω 13,10 13,13 13,13

REMARKS




Ver

sion

: 1

Page 9 168-08 REACTANCE MEASUREMENT OVERVIEW

Tap position 1 Reactance

Measured between the phases

Calculated per leg Change per leg

Ω Ω %

Test number

A-C B-C A-B C B A C B A Before tests 16,52 16,43 16,37 24,91 24,63 24,44 - - -

AT 081024-6017 16,59 16,71 16,62 24,80 25,18 24,90 -0,4 2,2 1,9 AT 081024-6018 16,65 16,78 16,65 24,91 25,29 24,91 0,0 2,7 1,9 AT 081024-6019 16,68 16,81 16,68 24,96 25,34 24,96 0,2 2,9 2,1

After tests 16,87 16,90 16,87 25,29 25,38 25,29 1,5 3,1 3,5




Ω Ω %

Test number


AT 081024-6021 14,95 15,02 14,89 22,43 22,62 22,24 3,1 2,6 1,8 AT 081024-6022 14,99 15,05 14,92 22,48 22,67 22,29 3,3 2,9 2,0 AT 081024-6023 14,99 15,05 14,92 22,48 22,67 22,29 3,3 2,9 2,0

After tests 15,05 15,08 15,02 22,57 22,67 22,48 3,8 2,8 2,9




Ω Ω %

Test number


AT 081024-6025 13,10 13,16 13,10 19,62 19,81 19,62 3,5 2,9 2,5 AT 081024-6026 13,13 13,16 13,13 19,68 19,78 19,68 3,8 2,8 2,8 AT 081024-6027 13,13 13,16 13,13 19,68 19,78 19,68 3,8 2,8 2,8

After tests 13,13 13,16 13,13 19,68 19,78 19,68 3,8 2,8 2,8 MAXIMUM DEVIATION The maximum deviation in reactance per leg was 3,8%. The maximum deviation allowed in accordance with the IEC 60076-5 is 7,5%.

M

2 D

1 V

ersi

on: 1

Page 10 Standard and date Standard IEC 60076-1, clause 10.1.1 Test date 15-10-2008 Transformer in same condition. Environmental conditions Ambient temperature 21 °C Ambient air pressure 1013 hPa Temperature of test object 20,6 °C Humidity 12 g/m3

MEASUREMENT OF WINDING RESISTANCE DC-winding resistances at 20,6 °C HV winding (Ω) LV winding (mΩ)

Tap position Terminals

1 3 5 Terminals

A8-B8 1,106 1,047 0,989 a2-b2 1,364 A8-C8 1,107 1,048 0,990 a2-c2 1,383 B8-C8 1,105 1,046 0,989 b2-c2 1,363 Average 1,106 1,047 0,989 Average 1,370

Requirements

None. Result

The results are used for further calculations and are for information only.

168-08 DUTY: Routine tests before short-circuit tests

M4

Ver

sion

: 1

M4

Ver

sion

: 1

Page 11 MEASUREMENT OF VOLTAGE RATIO AND CHECK OF PHASE DISPLACEMENT Ratio for Dyn11 Tap position 1 3 5 Declared ratio 46,20 44,00 41,80 Phase 1 46,23 44,02 41,81 Phase 2 46,23 44,02 41,81 Phase 3 46,23 44,02 41,81 Average 46,23 44,02 41,81 Deviation from declared ratio (%) -0,06 -0,04 -0,02

Requirements

None. Result


168-08 Routine tests before short-circuit tests

Ver

sion

: 1

Page 12 MEASUREMENT OF SHORT-CIRCUIT IMPEDANCE AND LOAD LOSS Load loss and characteristics at θref of 75 °C Tap position 1 3 5 Load-losses (W) 10385 10600 10782 RK (Ω) 1,39 1,28 1,18 UR (%) 1,04 1,06 1,08 XK (Ω) 8,12 7,23 6,30 UX (%) 6,08 5,97 5,77 ZK (Ω) 8,23 7,34 6,41 UK (%) 6,17 6,07 5,87

Requirements None. Results



Ver

sion

: 1

Page 13 MEASUREMENT OF NO-LOAD LOSS AND CURRENT No-load losses and currents in tap position 3 Terminal Urms Umean I I/In x 100 P Po

(V) (V) (A) (%) (W) (W) a2 436,5 433,6 4,12 0,31 504 b2 434,3 433,3 3,40 0,25 284 c2 435,1 432,8 4,28 0,32 321 Average 435,3 433,2 3,93 0,29 Total 1109 1104

Note: The no-load losses are calculated with the formula

−+=

mean

RMSmean

UUUPP 10




Ver

sion

: 1

Page 14 DIELECTRIC ROUTINE TESTS Separate source AC withstand voltage test (applied voltage test)

Requirements

No collapse of the test voltage shall occur. Result

The tests are passed. INDUCED AC VOLTAGE TESTS (ACSD)

Requirements


The test is passed.

Applied voltage Duration Frequency Tap position Winding

(kV) (min) (Hz) HV 28 1 50

3 LV 3 1 50

Induced voltage phase-to-phase

Duration Frequency Tap position Winding

(V) (min) (Hz) 3 LV 866 1 100


Ver

sion

: 1

Page 15 TEST NUMBERS 081024-6017 081024-6018 081024-6019 081024-6021 081024-6022 081024-6023 081024-6025 081024-6026 081024-6027

CONDITION BEFORE TESTS Transformer in same condition. Supply to HV winding by means of flexible connections. LV winding short-circuited by means of shunts and earthed. Tank earthed via an earth fault current indicating CT.

168-08 DUTY: Short-circuit tests

D1

Ver

sion

: 1

M4

Ver

sion

: 1

M4

Ver

sion

: 1

Page 16

Ι

G LMB MS PT

U

U

U Ι

Ι

Ι

TO

Ι

Ι

Ι

Ι

ΙU

TEST-CIRCUIT S01

G = Generator TO = Test Object U = Voltage Measurement to earth MB = Master Breaker L = Reactor = Current Measurement MS = Make Switch PT = Power Transformer

Supply

Power MVA 500

Frequency Hz 50

Phase(s) 3

Voltage kV 11

Current kA 26,24

Impedance Ω 0,242

Power factor < 0,1

Neutral not earthed

Load

Short-circuit point earthed

Remarks: -

168-08 Test circuit for Short-circuit tests

C1

Ver

sion

: 1

Page 17

System power of : 500 MVA System voltage of: 11 kV tap position 1 Max. 3 Nom. 5 Min. tap voltage 11,55 kV 11,00 kV 10,45 kV impedance voltage % 6,17 % 6,07 % 5,87 % resistance % (75°C) 1,04 % 1,06 % 1,08 % TAP POSITION 1 Max.

Supply voltage: 11,55 kV Terminal voltage: 11,55 kV

Short cir. current min. value rated max. value

HV current 728,9 A 809,9 A 890,8 A

LV current 19,44 kA 21,60 kA 23,76 kA

LV peak current 46,25 kA 48,68 kA 51,12 kA

HV reactance: 8,12 Ω HV inductance: 25,84 mH

TAP POSITION 3 Nom.



HV current 778,9 A 865,4 A 951,9 A




TAP POSITION 5 Min.



HV current 847,3 A 941,5 A 1035,6 A




peakfactor according to IEC = 2,24 Zsupply / Ztrafo = 3,30 % peakfactor according to X/R = 2,24

168-08 Calculation sheet short-circuit current for Short-circuit tests

M2

Ver

sion

: 1

Page 18

168-08 Photograph before test

P1-

BT

Ver

sion

: 1

Page 19

I2pri 5.01kA pu

I3pri 5.01kA pu

Itank 5.01kA pu

I1sec 125kA pu

I2sec 125kA pu

I3sec 125kA pu

U1S 38.6kV pu

U2S 38.6kV pu

U3S 38.6kV pu

Uprot 20.1kV pu

I1pri 5.01kA pu

6017

unit 1.00 s

TEST NUMBER: 081024-6017

Phase C B A

Tap position 1

Voltage, phase value, beginning kV 6,63 6,67 6,57

Voltage, phase value, end kV 6,61 6,65 6,57

Current HV-winding, peak value A 1679 1279 -1775

Current HV-winding, phase value, beginning A 783 776 772

Current HV-winding, phase value, end A 777 773 767

Current HV-winding, phase value, average A 781 775 770

Current LV-winding, peak value kA 48,7 -36,1 -42,2

Current LV-winding, phase value, beginning kA 20,7 21,4 20,6

Current LV-winding, phase value, end kA 20,5 21,2 20,6

Current LV-winding, phase value, average kA 20,6 21,3 20,6

Current duration s 0,510

Reactance after test Ω 16,59 16,71 16,62

Remarks: No visible disturbance. Reactances measured between resp. A-C, B-C, A-B.

168-08 Short-circuit test

T41

Ver

sion

: 1

Page 20

I2pri 5.01kA pu

I3pri 5.01kA pu

Itank 5.01kA pu

I1sec 125kA pu

I2sec 125kA pu

I3sec 125kA pu

U1S 38.6kV pu

U2S 38.6kV pu

U3S 38.6kV pu

Uprot 20.1kV pu

I1pri 5.01kA pu

6018

unit 1.00 s


Phase C B A

Tap position 1



Current HV-winding, peak value A -1667 -1290 1790




Current LV-winding, peak value kA -48,5 35,7 42,1








T41

Ver

sion

: 1

Page 21

I2pri 5.01kA pu

I3pri 5.01kA pu

Itank 5.01kA pu

I1sec 125kA pu

I2sec 125kA pu

I3sec 125kA pu

U1S 38.6kV pu

U2S 38.6kV pu

U3S 38.6kV pu

Uprot 20.1kV pu

I1pri 5.01kA pu

6019

unit 1.00 s


Phase C B A

Tap position 1



Current HV-winding, peak value A 1688 1250 -1757




Current LV-winding, peak value kA 48,5 -36,9 -41,5








T41

Ver

sion

: 1

Page 22

I2pri 5.01kA pu

I3pri 5.01kA pu

Itank 5.01kA pu

I1sec 125kA pu

I2sec 125kA pu

I3sec 125kA pu

U1S 38.6kV pu

U2S 38.6kV pu

U3S 38.6kV pu

Uprot 20.1kV pu

I1pri 5.01kA pu

6021

unit 1.00 s


Phase C B A

Tap position 3



Current HV-winding, peak value A 1838 -1772 -1308




Current LV-winding, peak value kA 40,8 -49,1 37,0








T41

Ver

sion

: 1

Page 23

I2pri 5.01kA pu

I3pri 5.01kA pu

Itank 5.01kA pu

I1sec 125kA pu

I2sec 125kA pu

I3sec 125kA pu

U1S 38.6kV pu

U2S 38.6kV pu

U3S 38.6kV pu

Uprot 20.1kV pu

I1pri 5.01kA pu

6022

unit 1.00 s


Phase C B A

Tap position 3



Current HV-winding, peak value A -1840 1780 1309




Current LV-winding, peak value kA -40,9 49,1 -37,5








T41

Ver

sion

: 1

Page 24

I2pri 5.01kA pu

I3pri 5.01kA pu

Itank 5.01kA pu

I1sec 125kA pu

I2sec 125kA pu

I3sec 125kA pu

U1S 38.6kV pu

U2S 38.6kV pu

U3S 38.6kV pu

Uprot 20.1kV pu

I1pri 5.01kA pu

6023

unit 1.00 s


Phase C B A

Tap position 3



Current HV-winding, peak value A 1845 -1806 -1296




Current LV-winding, peak value kA 40,7 -49,6 38,1








T41

Ver

sion

: 1

Page 25

I2pri 5.01kA pu

I3pri 5.01kA pu

Itank 5.01kA pu

I1sec 125kA pu

I2sec 125kA pu

I3sec 125kA pu

U1S 38.6kV pu

U2S 38.6kV pu

U3S 38.6kV pu

Uprot 20.1kV pu

I1pri 5.01kA pu

6025

unit 1.00 s


Phase C B A

Tap position 5



Current HV-winding, peak value A -1365 2000 -1986




Current LV-winding, peak value kA 39,1 42,5 -51,2








T41

Ver

sion

: 1

Page 26

I2pri 5.01kA pu

I3pri 5.01kA pu

Itank 5.01kA pu

I1sec 125kA pu

I2sec 125kA pu

I3sec 125kA pu

U1S 38.6kV pu

U2S 38.6kV pu

U3S 38.6kV pu

Uprot 20.1kV pu

I1pri 5.01kA pu

6026

unit 1.00 s


Phase C B A

Tap position 5



Current HV-winding, peak value A 1365 -2001 1990




Current LV-winding, peak value kA -39,1 -42,5 50,6








T41

Ver

sion

: 1

Page 27

I2pri 5.01kA pu

I3pri 5.01kA pu

Itank 5.01kA pu

I1sec 125kA pu

I2sec 125kA pu

I3sec 125kA pu

U1S 38.6kV pu

U2S 38.6kV pu

U3S 38.6kV pu

Uprot 20.1kV pu

I1pri 5.01kA pu

6027

unit 1.00 s


Phase C B A

Tap position 5



Current HV-winding, peak value A -1350 1982 -1984




Current LV-winding, peak value kA 39,5 42,1 -50,8








T41

Ver

sion

: 1

Page 28 CONDITION AFTER TEST

Externally no visible change.

168-08 CONDITION AFTER TEST

D3

Ver

sion

: 1

Page 29

168-08 Photograph after test

P1-

AT

Ver

sion

: 1

Page 30 Standard and date Standard IEC 60076-1, clause 10.1.1 Test date 28-10-2008 Transformer in same condition. Environmental conditions Ambient temperature 20 °C Ambient air pressure 1004 hPa Temperature of test object 19,6 °C Humidity 7 g/m3

MEASUREMENT OF WINDING RESISTANCE DC-winding resistances at 19,6 °C HV winding (Ω) LV winding (mΩ)

Tap position Terminals

1 3 5 Terminals

A8-B8 1,096 1,039 0,981 a2-b2 1,347 A8-C8 1,098 1,040 0,982 a2-c2 1,373 B8-C8 1,096 1,039 0,981 b2-c2 1,357 Average 1,097 1,039 0,981 Average 1,359

Requirements

None. Result


168-08 DUTY: Routine tests after short-circuit tests

M4

Ver

sion

: 1

Page 31 MEASUREMENT OF VOLTAGE RATIO AND CHECK OF PHASE DISPLACEMENT Ratio for Dyn11 Tap position 1 3 5 Declared ratio 46,20 44,00 41,80 Phase 1 46,23 44,02 41,80 Phase 2 46,23 44,02 41,80 Phase 3 46,23 44,02 41,80 Average 46,23 44,02 41,80 Deviation from declared ratio (%) -0,06 -0,04 0,00

Requirements

None. Result


168-08 Routine tests after short-circuit tests

Ver

sion

: 1

Page 32 MEASUREMENT OF SHORT-CIRCUIT IMPEDANCE AND LOAD LOSS Load loss and characteristics at θref of 75 °C Tap position 1 3 5 Load-losses (W) 10339 10584 10750 RK (Ω) 1,38 1,28 1,17 UR (%) 1,03 1,06 1,08 XK (Ω) 8,34 7,44 6,49 UX (%) 6,25 6,15 5,94 ZK (Ω) 8,45 7,55 6,59 UK (%) 6,34 6,24 6,04




Ver

sion

: 1

Page 33 MEASUREMENT OF NO-LOAD LOSS AND CURRENT No-load losses and currents in tap position 3 Terminal Urms Umean I I/In x 100 P Po

(V) (V) (A) (%) (W) (W) a2 435,2 432,7 4,18 0,31 476 b2 434,5 433,5 3,39 0,25 321 c2 435,3 432,9 4,08 0,31 304 Average 435,0 433,0 3,88 0,29 Total 1101 1096

Note: The no-load losses are calculated with the formula

−+=

mean

RMSmean

UUUPP 10




Ver

sion

: 1

Page 34 DIELECTRIC ROUTINE TESTS Separate source AC withstand voltage test (applied voltage test)

Requirements


The tests are passed. INDUCED AC VOLTAGE TESTS (ACSD)

Requirements


The test is passed.

Applied voltage Duration Frequency Tap position Winding

(kV) (min) (Hz) HV 28 1 50

5 LV 3 1 50

Induced voltage phase-to-phase

Duration Frequency Tap position Winding

(V) (min) (Hz) 1 LV 866 1 100


Ver

sion

: 1

Page 35 INSPECTION OF THE ACTIVE PART

On 29 October 2008 the transformer was untanked and the active part was inspected. The out-of-tank inspection with respect to displacements, deformations of core and windings, connections and supporting structures or traces of discharges did not reveal any apparent defects.

CONCLUSION

The transformer complies with IEC 60076-5 (Ability to withstand short-circuit), subclause 4.2.7.

168-08 INSPECTION / CONCLUSION

Ver

sion

: 1

Page 36

168-08 Photograph during inspection

P1-

GE

V

ersi

on: 1

Page 37


P1-

GE

V

ersi

on: 1

Page 38


P1-

GE

V

ersi

on: 1

Page 39

168-08 Drawing

DR

D

R

DR

V

ersi

on: 1

V

ersi

on: 1

Page 40

168-08 Drawing

DR

D

R

DR

V

ersi

on: 1

V

ersi

on: 1

Documents

TYPE TEST CERTIFICATE OF SHORT-CIRCUIT PERFORMANCE · TYPE TEST CERTIFICATE OF SHORT-CIRCUIT PERFORMANCE ... IEC 60076-5 This Type Test Certificate has been issued by KEMA following