HIGH VOLTAGE LABORATORY INSTYTUT ENERGETYKI

Transcription

1 HIGH VOLTAGE LABORATORY INSTYTUT ENERGETYKI POLAND WARSZAWA, ul. Mory 8, tel. (+48 22) , fax (+48 22) EWN/70/E/11-1 APPENDIX 4 APPENDIX 4 for test report EWN/70/E/11-1 Report of performed tests in High Current Laboratory of Institute of Power Engineering in Warsaw. EWP/33/E/2011-2e of EWP/69/E/2011e of (Temperature-rise test)

2 INSTITUTE OF POWER ENGINEERING HIGH CURRENT LABORATORY Warszawa ul. Mory 8 tel. (22) tel./fax (22) [email protected] TEST REPORT No. EWP/38/E/2011-2e TEST OBJECT: Combined transformer type PVA 123 MANUFACTURER: TESTS ORDERED BY: TYPE OF TESTS: ABB Sp. z o.o. Oddział Przasnysz ul. ega ska 1, Warszawa Institute of Power Engineering, High-Voltage Department, Order No. EWN/70/E/11 dated Temperature-rise test TEST PROCEDURE: PN-EN : 2006, PN-EN : 2000, PN-EN : 2001, PN-EN : 2001/A2: 2004 TEST OBJECT DELIVERED: r. DATE OF TESTS: r r. TESTS RESULTS: Positive Tests result refers only to the test object. The Test Report consist tests from and beyond the scope of accreditation (details in sub-cl. 4) Publishing or reproducing of this report in other version then exact and complete without written permission of laboratory is forbidden THE TESTS WERE WITNESSED BY: Zbigniew Wesołowski M.Sc. Eng. ABB Sp. z o.o. TEST ENGINEER : HEAD OF LABORATORY : Lidia Gruza M.Sc. Eng. Lidia Gruza M.Sc. Eng. TEST REPORT TRANSLATION Kieliszek M.Sc. Eng. Warszawa, r.

3 EWP/38/E/2011-2e Contents 1. Description of the test object 2. Technical data declared by the Manufacturer 3. Technical documentation of the test object 4. Scope of the tests 5. Tests and their results 6. Summary 7. Opinions and interpretations 8. Photographic documentation Report contains 18 numbered pages with: 2 Figures 3 Photographs 0 Oscillogramms 1 Appendix Strona 2 / 18

4 EWP/38/E/2011-2e 1. Description of the test object Test object Type, Serial number Manufacturer Year 2011 Insulator Combined transformer PVA 123, Serial number: 2GKP011K ABB Oddział Przasnysz porcelain Number of windings *) VT part - 5, CT part 4 Oil type Minimum creepage distance Insulating oil weight Total weight Dimensions Nytro Libra 3625 mm 150 kg 640 kg According to drawing no. 2GKK *) Winding design and dimensions are given in Appendix. The laboratory made the identification of test objects on the base of the documentation given in par. 3 - see Appendix. The test object is shown in the photograph 1, 2, 3. The object was prepared for testing by the Orderer. 2. Technical data declared by the Manufacturer Maximum operating voltage Rated frequency Voltage factor and time Rated primary current, I cth Rated short-time thermal current, I th / 1s Rated dynamic current, I dyn 123 kv 50 Hz 1,9Un/8h A ka ka Strona 3 / 18

5 EWP/38/E/2011-2e VT part Kind of secondary winding 1a-1n 2a-2n 3a-3n 4a-4n da-dn Rated secondary voltage 100: 3 100: 3 100: 3 100: 3 100:3 Rated power of winding 15 VA 15 VA 20 VA 25 VA 50 VA Accuracy class 0,1 0,1 0,2/3P 0,5/3P 3P Rated thermal limit power 1000 VA 1000 VA 1000 VA 1000 VA 450 VA CT part Type of secondary winding 1S1-1S2 2S1-2S2 3S1-3S2 4S1-4S2 Rated secondary current 5 A 1 A 5 A 1 A Rated power of winding 10 VA 2,5 VA 15 VA 15 VA Accuracy class 0,5 0,5 5P 5P FS/ALF Ratio A/A A/A A/A Ext. 200 % 200% 3. Technical documentation of the test object Drawing no. 2GKK Rysunek wymiarowy (dimensional drawing). Przekładnik kombinowany (combined transformer) PVA 123, ABB Sp. z o.o. Power Products, zatwierdzony (approved) Verification protocol of the combined transformer type PVA 123, Serial No.: 2GKP011K ABB Sp. z o.o., Przasnysz, Strona 4 / 18

6 EWP/38/E/2011-2e 4. Scope of the tests Test programme agreed with Orderer comprised of tests: Lp. Kind of test Standard Location of the test 1. Temperature-rise PN-EN : 2006 sub-cl. 4.2, 7.2b, PN-EN : 2000 sub-cl. 4.6, 7.2, PN-EN : 2001 sub-cl. 5.4, 8.1, PN-EN : 2009, table 3, p. 4 EWP EWP The test was performed in Institute of Power Engineering, by High - Current Laboratory. 5. Tests and their results Combined transformer was installed at the test stand, as it was during normal operation. Electric diagram of terminal box of tested combined transformer is given in Fig. 1 The rated voltage with a required value was applied to the primary voltage winding. The secondary voltage windings and the residual voltage winding were loaded with the rated power, according to the test programme given below, which was agreed with the Orderer. Primary current winding P1 and P2/A was short-circuited at the range of 200 A. Current in primary current of the CT part winding was equal to 400 A. The arrangement of the thermocouples is given in Fig. 2. The temperature-rises of windings were measured by the resistance rise method. During the test, the measurements of loaded windings were made every 1 hour and registered the deflection of oil level indicator. The resistance of all windings was measured before the test and after of each phase of tests. The abstract of the protocol of temperature-rise test is given in Tables 1 and 2. The summary of test results is given in Table 3 On request of the Orderer, the temperature-rise of windings were calculated from the formula: R R1 R0 T = = R α R 0, Strona 5 / 18

7 EWP/38/E/2011-2e Stage No. 1. Test at the rated load Test was performed according to IEC sub-cl. 8.1, i 5.4 a) The voltage value 1,2 Un = 76,2 kv was applied to P2/A winding. The secondary voltage windings were loaded as follows:1a-1n 15 VA, cos = 1, at the voltage 100/ -2n 15 VA, cos = 1, at the voltage 100/ -3n 20 VA, cos = 1, at the voltage 100/ 4a-4n 25 VA, cos = 1, at the voltage 100/ 3 V. The winding of residual voltage remained open. The secondary current windings were loaded as follows:1s1-1s2 10 VA, cos = 1; 2S1-2S2 2,5 VA, cos = 1; 4S1-4S2 15 VA, cos = 1. Supply (current control) was applied to secondary current winding 3S1-3S2. Terminals P1 and P2/A were short-circuited at the range 200 A. The test was performed till reached steady state temperature. Cross-sections of secondary current and voltage windings are given in Appendix. Stage No. 2 Test of 8 h Test was done immediately after Stage No. 1 according to IEC sub-cl. 8.1, i 5.4 c). The voltage value 1,9 Un = 119,7 kv was applied to the winding P2/A. The secondary voltage windings were loaded as follows: 1a-1n 15 VA, cos = 1, at the voltage 100/ -2n 15 VA, cos = 1, at the voltage 100/ -3n 20 VA at the voltage 100/ 4a-4n 25 VA, cos = 1, at the voltage 100/ 3 V. The residual winding da-dn was loaded by 450 VA, cos = 1, at the voltage 100/3 V. The secondary windings of the CT part were loaded by powers: 1S1-1S2 10 VA cos = 1; 2S1-2S2 2,5 VA cos = 1; 4S1-4S2 15 VA cos = 1. Supply (current control) was applied to secondary current winding 3S1-3S2. Terminals P1 and P2/A were short-circuited at the range 200 A. The duration of the test was 8 h. Winding da-dn was wound by profiled wire Cu 2 4,5 mm (25 turns), winding A-N was wound by wire Cu = 0,18 mm (47234 turns), remaining secondary current and voltage windings see Appendix. Stage No. 3 Test with thermal limit power till temperature reach steady state Test was done immediately after Stage No. 2 according to standard IEC sub-cl. 8.1, and 5.4a). The voltage value Un = 63 kv was applied to the winding P2/A. The secondary voltage windings were loaded as follows: 1a-1n 1000 VA, cos = 1, at the voltage 100/ -2n 15 VA, cos = 1, at the voltage 100/ -3n 20 VA at the voltage 100/ 4a-4n 25 VA, cos = 1, at the voltage 100/ 3 V. The winding da-dn of residual voltage remained open. The secondary current windings were loaded as follows: 1S1-1S2 10 VA, cos = 1; 2S1-2S2 2,5 VA, cos = 1; 4S1-4S2 15 VA, cos = 1. Supply (current control) was applied to secondary current winding 3S1-3S2. Terminals P1 and P2/A were short-circuited at the range 200 A. The test was performed till reaching the steady state temperature. Windings 1a-1n, 2a-2n, 3a-3n and 4a -4n were wound with profile wire Cu 1,5 4,5 mm (43 turns). Secondary current windings see Appendix. Strona 6 / 18

8 EWP/38/E/2011-2e Stage No. 4 Test with total thermal limit power till temperature reach steady state Test was done immediately after Stage No. 3 in configuration according to Manufacurer s request. The voltage value Un = 63 kv was applied to the winding P2/A. Each secondary voltage winding (i.e. 1a-1n, 2a-2n, 3a-3n and 4a -4n) was loaded by limit power 1000 VA at cos = 1. The residual winding remained open. The secondary current windings were loaded as follows: 1S1-1S2 10 VA, cos = 1; 2S1-2S2 2,5 VA, cos = 1; 4S1-4S2 15 VA, cos = 1. Supply (current control) was applied to secondary current winding 3S1-3S2. Terminals P1 and P2/A were short-circuited at the range 200 A. The test was performed till reaching the steady state temperature. Measuring instruments The temperatures were measured by means of type K thermocouples (NiCr NiAl) with accuracy ± 0,6 o C 1. The ambient temperature was measured using four mercurial thermometers immersed into tank filled with oil. These thermometers were placed in the distance of 1 meter from the tested transformer at the height of 1 meter above floor- the accuracy of measurement ± 0,03 C 2. The resistance was measured by means of meter type 2291 manufactured by TETTEX Instruments with accuracy ± 0,01 mω 3 1 The expanded uncertainty assigned corresponds to a coverage probability of 95 % and the coverage factor k = 2. 2 The expanded uncertainty assigned corresponds to a coverage probability of 95 % and the coverage factor k = 2. 3 The expanded uncertainty assigned corresponds to a coverage probability of 95 % and the coverage factor k = 2. Strona 7 / 18

9 EWP/38/E/2011-2e Fig. 1. Electrical diagram of terminal box of tested combined transformer (based on documentation page 3, item 2) Strona 8 / 18

10 EWP/38/E/2011-2e Fig. 2. Arrangement of thermocouples during temperature-rise tests : 1- oil (over current coil); 2- head (contraction of the flange connecting the head with the insulator); 3- under the flange of tank lid; 4- lower tank (placed inside over earthing terminal ); 5- terminal P1 (contraction in flat part); 6 terminal P2/A (200 A, contraction in flat part); 7 terminal; 8 connection. Strona 9 / 18

11 EWP/38/E/2011-2e Table 1. Temperature-rise test results of transformer PVA 123, serial No. 2GKP011K *) Temperature [ C] after heating time [h] No. of thermocouple Stage No. 1 Stage No. 2 Stage No ,6 21,2 21,4 21,7 21,9 21,8 24,3 22,2 22,6 22,8 23,1 23,2 23,6 24, ,8 23,5 23,8 23,8 23,8 23,8 23,8 24,3 2 21,5 21,5 21, ,9 22, ,4 22,7 22,9 23,1 23,3 23,5 24, ,5 23,5 23,5 23,5 23,8 23,8 23,8 24,3 3 21,1 21,5 21,9 22,8 22,9 23,3 24,8 23,1 23,2 23,8 23,8 23,8 23, ,3 24,8 24,8 24,8 24,8 25, ,8 25, ,7 22,1 22,8 22,7 22,9 24,4 23,1 23,2 23,3 23,3 23,3 23, ,3 24,8 24,5 25, , ,5 22,8 23,2 23,6 23,8 23,9 25,4 24,1 24,3 24,5 24,6 24,5 24,7 25, ,8 24,5 24,5 24,3 24,8 24,5 24, ,5 23, ,7 24,6 24,8 26,1 24,9 25,1 25,3 25,4 25,5 25,5 26,5 26,2 25,7 25,5 25,5 25,5 25,5 25,5 25,5 25, ,5 23,3 23,9 24,6 24,6 24, , ,1 25,2 25,2 25,3 26,2 25,7 25,5 25,2 25, ,5 8 21,5 23,3 23,9 24,5 24,5 24,7 25, ,2 25,4 25,5 25,5 26,2 25,7 25,5 25,5 25,5 25,5 25,7 25,7 25,7 25,98 T ot r, C 21,1 21,3 21,5 21,7 21, ,9 21,9 21,9 21, ,2 22,3 22,4 22,4 22,4 22,45 22,45 22,45 22,3 U zas, kv 76,2 kv 119,7 kv 63 kv I zas, A 10,36 10,4 10,4 10,3 10,3 10,3 10,4 10,3 10,4 10,3 10,3 10,3 10,3 10,3 10,3 10,3 10,3 10,31 10,32 10,32 10,33 10,28 10,32 I 1S1-1S2, A 9,66 9,38 9,32 9,34 9,34 9,32 9,32 9,76 9,68 9,84 9,86 9,6 9,76 9,78 9,7 9,76 9,72 9,76 9,78 9,76 9,78 9,72 9,29 I P1-P2/A, A 403, ,3 401,7 401,7 402,0 400,1 401,7 I P2/A-N, ma R 1S1-1S2, mω 49,27 49,58 49,8 49,8 49, ,1 50,1 50,2 50,3 50,5 50,5 50,4 50,5 50,6 50,6 50,67 50,68 50,82 50,88 50,93 50,93 R 2S1-2S2, mω 391, ,3 - R 3S1-3S2, mω 68,56 69,5 69,7 69,6 69,7 70,3 69,8 70,8 69, ,6 71,3 71,3 71,4 70,3 70,4 70,6 70,53 70,74 70,76 71,03 70,75 71,14 R 4S1-4S2, mω 904, ,29 - R P1-P2/A, mω 0, T 1S1-1S2-1,563 2,69 2,69 3,2 3,7 3,7 4,21 4,21 4,72 5,23 6,24 6,24 5,73 6,24 6,75 6,75 7,1 7,16 7,87 8,17 8,42 8,42 T 2S1-2S , ,79 - T 3S1-3S2-3,43 4,16 3,79 4,16 6,3 4,5 8,17 4,16 5,25 7,44 9,99 9,99 10,4 6,35 6,71 7,44 7,18 7,95 8,02 9,0 7,99 9,41 T 4S1-4S , ,52 - T P1-P2/A R 1a-1n, mω 46,347 46,57 46,7 46,8 46, ,1 47,1 47,1 47,2 47,2 47,2 47,9 48,2 48,3 48,35 48,43 48,46 48,51 48,54 48,27 R 2a-2n, mω 48,25 48,46 48,6 48,7 48,8 48,9 48, ,1 49,1 49,1 49,9 50,2 50,3 50,43 50,52 50,57 50,60 50,65 50,31 R 3a-3n, mω 50,365 50,56 50,8 50,8 50, ,1 51,1 51,1 51,2 51,2 51,2 51,2 51,3 52,1 52,4 52,6 52,68 52,77 52,83 52,87 52,92 52,5 Strona 10 / 18

12 EWP/38/E/2011-2e Table 1 cont. Stage No. 1 cont. Stage No. 2 cont R 4a-4n, mω 52,479 52,66 52, ,1 53,2 53,2 53,3 53,3 53,3 53,3 53,4 53, ,196 54,72 R da-dn, mω 27, ,6 28,1 28,4 28,4 28,5 28,56 28,58 28,62 28,62 - R P2/A-N, kω 20,8-20,5-20,6-20,7-20,8-20,9-20,9 20,9 20,9-21,1-21,27 21,35 21,38 21,4 21,45 T 1a-1n, - 1,2 1,9 2,44 2,98 3,52 3,52 3,52 4,06 4,06 4,06 4,6 4,6 4,6 8,38 9,99 10,53 10,8 11,21 11,39 11,67 11,81 10,39 T 2a-2n, - 1,08 1,81 2,33 2,85 3,37 3,37 3,89 3,89 3,89 3,89 4,4 4,4 4,4 8,55 10,1 10,62 11,3 11,76 12,02 12,18 12,44 10,67 T 3a-3n, - 0,97 2,16 2,16 2,66 3,15 3,65 3,65 3,65 4,15 4,15 4,15 4,15 4,64 8,61 10,1 11,09 11,49 11,94 12,24 12,43 12,68 10,6 T 4a-4n, - 0,86 1,53 2,48 2,48 2,96 3,44 3,44 3,91 3,91 3, ,39 4, ,94 10,68 T da-dn, ,27 8,87 11,64 11,64 12,56 13,11 13,29 13,66 13,66 - T P2/A-N, ,6 - -2,4 - -1, ,2-1,2 1,2 1,2-3,61-5,65 6,61 6,97 7,21 7,81 Wychylenie wska nika poziomu oleju, mm Stage No. 3 cont. Tablica 2. Temperature-rise test results of transformer PVA 123, serial No. 2GKP011K *) cont. Temperature [ C] after heating time [h] No. of thermocouple Stage No. 3 cont. Stage No ,2 25,13 25,6 25,4 25,28 25,33 25,7 25,7 25,93 26,05 26,45 27,33 27,08 27, ,8 24,7 25,1 24,9 24,95 25,21 25,38 25,48 25,77 25,98 26,25 27,03 26,9 27, ,2 24,9 24,1 25,0 25,30-25,63 26,13 26,8 27,10 27,53 27,55 27,98 27,95 28, ,7 24,6 24,8 25,25 26,1 25,8 26,35 26,58 26,65 26,43 27,30 27,25 27, ,5 25,7 25,9 25,8 25,65 25,8 25,98 26,1 26,28 26,43 26,63 27,00 26,93 27, ,5 26,4 26,6 26,5 26,35 26,55 26,7 26,85 26,95 27,08 27,23 27,58 27,48 27, ,2 26,1 26,3 26,1 26,05 26,23 26,38 26,45 26,58 26,68 26,85 27,18 27,03 27, ,7 26,7 26,7 26,6 26,63 26,78 26,95 27,10 27,28 27,45 27,65 27,93 27,9 27,95 T ot r, C 22,3 22,25 22,28 22,23 22,55 22,78 22,9 22, ,98 22,9 22,88 22,8 22,8 U zas, kv 63 kv 63 kv I zas, A 10,28 10,3 10,32 10,28 10,3 10,308 10,332 10,24 10,24 10,3 10,32 10,34 10,26 10,238 I 1S1-1S2, A 9,52 9,52 9,52 9,32 9,58 9,4 9,528 9,58 9,56 9,58 9,48 9,48 9,57 9,544 I P1-P2/A, A 400,1 400,88 401,65 400,1 400,88 401,19 402,12 398,54 398,54 400,88 401,65 402,43 399,32 398,46 I P2/A-N, ma Strona 11 / 18

13 EWP/38/E/2011-2e Table 2 cont. Stage No. 3 cont. Stage No. 4 cont R 1S1-1S2, mω 50,98 50,98 50,95 50,96 50,98 51,123 51,067 51,17 51,22 51,27 51,35 51,26 51,43 51,34 R 2S1-2S2, mω , ,92 R 3S1-3S2, mω 71,539 71,182 71,181 70,984 71,14 71,79 71,103 71,539 71,28 71,837 72,067 71,33 72,03 71,81 R 4S1-4S2, mω , ,67 944,31 R P1-P2/A, mω ,0297 T 1S1-1S2 8,66 8,66 8,5 8,55 8,66 9,38 9,1 9,62 9,87 10,13 10,53 10,08 10,94 10,48 T 2S1-2S , ,1 11,98 T 3S1-3S2 10,86 9,55 9,55 8,83 9,4 11,77 9,27 10,86 9,91 11,94 12,78 10,09 12,65 11,84 T 4S1-4S , ,8 11,01 T P1-P2/A R 1a-1n, mω 48,202 48,157 48,072 48,078 49,962 50,233 50,029 50,373 50,48 50,524 50,583 50,542 50,627 50,497 R 2a-2n, mω 50,228 50,174 50,101 50,098 52,34 52,667 52,436 52,796 52,96 52,971 53,052 53,004 53,098 52,946 R 3a-3n, mω 52,412 52,351 52,293 52,281 54,645 55,066 54,88 55,243 55,406 55,49 55,548 55,475 55,601 55,457 R 4a-4n, mω 54,614 54,554 54,504 54,492 57,025 57,509 57,386 57,676 57,931 58,023 58,102 58,067 58,171 58,024 R da-dn, mω , ,337 30,236 R P2/A-N, kω - 21,4-21,35 22,54 23,12 23,85 23,78 24,03 24,17 24,36 23,7 24,28 24,36 T 1a-1n, 10,01 9,76 9,31 9,34 19,5 20,96 19,86 21,72 22,29 22,53 22,85 22, ,39 T 2a-2n, 10,25 9,97 9,59 9,58 21,19 22,89 21,69 23,55 24,4 22,46 24,88 24,63 25,12 24,33 T 3a-3n, 10,16 9,86 9,57 9,51 21,25 23,35 22,41 24,21 25,02 25,44 25,73 25,37 25,99 25,28 T 4a-4n, 10,17 9,89 9,65 9,59 21,66 23,96 23,38 24,76 25,97 26,41 26,79 26,62 27,12 26,42 T da-dn, , ,48 28,52 T P2/A-N, - 7,21-6,61 20,91 27,89 36,66 35,82 38, ,79 34,86 41,82 42,79 Deflection of the oil level indicator mm *) Before the test it was stated, that terminals panel applied in the tested transformer had influence at the resistance measurement. The springs, which pressed down the wires of windings had too weak pressure (the wires were movable). To prevent it, the terminal panel of the High-Current Laboratory was used. Marked with - are values not measured (agreed with Orderer) Strona 12 / 18

14 EWP/38/E/2011-2e Table 3. Temperature-rises [K] transformer PVA 123 serial No. 2GKP011K during temperature-rise test Winding after Stage No. 1 after Stage No. 2 after Stage No. 3 after Stage No. 4 1S1-1S2 5,73 8,42 8,55 10,48 2S1-2S2 6, ,67 11,98 3S1-3S2 10,4 7,99 8,83 11,84 4S1-4S2 5,95 8,52 9,41 11,01 P1-P2/A a- 1n 4,6 11,81 9,34 22,39 2a-2n 4,4 12,44 9,58 24,33 3a-3n 4,64 12,68 9,51 25,28 4a 4n 4,39 12,94 9,59 26,42 da-dn 4,27 13,66 9,35 28,52 P2/A-N 1,2 7,21 6,61 42,79 Thermocouple location after Stage No. 1 after Stage No. 2 ϑ after Stage No. 3 after Stage No. 4 ϑ dop. 75 1) 3) 75 2)3) ϑ dop. 1), 2), 3) Oil 2,3 1,3 3,2 4,87 55 Head top part next to terminal Under the tank lid from side of terminal box Enclosure of lower tank Terminal P1 (contraction in flat part) Terminal P2/A (contraction in flat part) 2,3 1,6 2,62 4,53 2 2,3 2,8 5,28 2 2,8 2,6 4,6 40 4) 3,2 2,1 3,5 4,3 65 4) 4,5 3,03 4,24 4, ) 1) acc. to PN-EN :2000, 2) acc. to PN-EN :2001, 3) acc. to PN-EN : 2006, 4) acc. to PN-EN :2009, ϑ - temperature-rise; ϑ dop permitted value in steady state Strona 13 / 18

15 EWP/38/E/2011-2e 6. Summary The temperature rise limits were not exceeded in tested transformer type PVA 123 with porcelain insulator. The tested transformer met the requirements of the PN-EN : 2006, PN-EN : 2000, PN-EN : 2001 i PN-EN : 2009 standards. 7. Opinions and interpretations None Strona 14 / 18

16 EWP/38/E/2011-2e 8. Photographic documentation Ph. 1. Combined transformer PVA 123, serial No /11, on the test stand during temperature-rise test. Strona 15 / 18

17 EWP/38/E/2011-2e APPENDIX Documentation delivered by the Manufacturer Strona 16 / 18

18 EWP/38/E/2011-2e Windings of tested transformer, document provided by the Manufacturer Strona 17 / 18

19 EWP/38/E/2011-2e Strona 18 / 18

20 INSTITUTE OF POWER ENGINEERING HIGH CURRENT LABORATORY Warszawa ul. Mory 8 tel. (22) tel./fax (22) [email protected] TEST REPORT No. EWP/69/E/2011e TEST OBJECT: Combined instrument transformer type PVA 123 MANUFACTURER: TESTS ORDERED BY: TYPE OF TESTS: ABB Sp. z o.o. Oddział Przasnysz ul. ega ska 1, Warszawa ABB Sp. z o.o. Oddział Przasnysz ul. ega ska 1, Warszawa Order No dated Temperature-rise test TEST PROCEDURE: IEC :2002, IEC :1996, IEC : 1997, IEC /A2:2002 TEST OBJECT DELIVERED: DATE OF TESTS: TESTS RESULTS: Positive Tests result refers only to the test object. The Test Report consist tests from and beyond the scope of accreditation (details in sub-cl. 4) Publishing or reproducing of this report in other version then exact and complete without written permission of laboratory is forbidden THE TESTS WERE WITNESSED BY : REPORT TRANSLATION: TEST ENGINEER : HEAD OF LABORATORY : Zbigniew Wesołowski M.Sc. Eng. ABB Sp. z o.o. Lidia Gruza M.Sc. Eng. Lidia Gruza M.Sc. Eng. Lidia Gruza M.Sc. Eng. Warsaw,

21 EWP/69/E/2011e Contents 1. Description of the test object 2. Technical data declared by the Manufacturer 3. Technical documentation of the test object 4. Scope of the tests 5. Tests and their results 6. Summary 7. Opinions and interpretations 8. Photographic documentation Report contains 18 numbered pages with: 2 Drawings 3 Photographs 0 Oscillogramms 1 Appendix Page 2 / 18

22 EWP/69/E/2011e 1. Description of the test object Test object Combined instrument transformer Type, Serial number PVA 123, 2GKP011K Manufacturer ABB Oddział Przasnysz Year 2011 Insulator Composite insulator Number of windings *) VT part - 5, CT part 6 Oil type Nytro Libra Minimum creepage distance 3800 mm Insulating oil weight 150 kg Total weight 550 kg Dimensions According to drawing no. 2GKK *) Winding design and dimensions are given in Appendix. The laboratory made the identification of test objects on the base of the documentation given in par. 3 - see Appendix. The test object is shown in the photographs No. 1, 2 and 3. The object was prepared for testing by the Manufacturer. 2. Technical data declared by the Manufacturer Maximum operating voltage Rated frequency Voltage factor and time Rated continuous thermal current, I cth Rated short-time thermal current, I th / 1s Rated dynamic current, I dyn 123 kv 50 Hz 1,9Un/8h 3000 A 63 ka 158 ka Page 3 / 18

23 EWP/69/E/2011e VT part Type of secondary winding 1a-1n 2a-2n 3a-3n 4a-4n da-dn Rated secondary voltage 100: 3 100: 3 100: 3 100: 3 100:3 Rated output 30 VA 30 VA 30 VA 60 VA 50 VA Accuracy class 0,2 0,2 0,2/3P 0,5/3P 3P Thermal limiting output 1000 VA 1000 VA 1000 VA 1000 VA 450 VA CT part Type of secondary winding 1S1-1S2 2S1-2S2 3S1-3S2 4S1-4S2 5S1-5S2 6S1-6S2 Rated secondary current 5 A 1 A 5 A 5 A 1 A 1 A Rated output 90 VA 45 VA 30 VA 90 VA 45 VA 60 VA Accuracy class 0,2S 0,5S 5P 5P 10P 10P FS/ALF Rated transformation ratio 3000/5 A/A 3000/1 A/A 3000/5 A/A 3000/5 A/A 3000/1 A/A 3000/1 A/A Ext. 120 % 120% 3. Technical documentation of the test object Drawing no. 2GKK610212/ Dimensional drawing. Combined transformer PVA 123, ABB Sp. z o.o. Power Products, approved Combined transformer verification protocol; type PVA 123, Series No.: 2GKP011K ABB Sp. z o.o., Przasnysz, Page 4 / 18

24 EWP/69/E/2011e 4. Scope of the tests Test programme agreed with Orderer comprised of tests: Kind of test Temperature-rise tests Tests according the Standard IEC :2002 sub-cl. 4.2, 7.2b, IEC :1996 sub-cl. 4.6, 7.2, IEC :1997 sub-cl. 5.4, 8.1, IEC :2007, Table No. 3, sub-cl. 4 Location of the test EWP EWP The test was performed in Institute of Power Engineering, by High - Current Laboratory. 5. Tests and their results Combined transformer was installed at the test stand, as it was during normal operation. Electric diagram of terminal box of tested combined transformer is given in Fig. 1 The rated voltage with a required value was applied to the primary voltage winding. The secondary voltage windings and the residual voltage winding were loaded with the rated power, according to the test programme given below, which was agreed with the Orderer. Primary current terminals P1 and P2/A was bridged at the range of 3000 A. According to Manufacturer s request current in primary current winding was equal to I cth = 3000 A. The arrangement of the thermocouples is given in Figure No. 2. The temperature-rises of windings were measured by the resistance rise method. During the test, the measurements of loaded windings were made every 1 hour and registered the deflection of oil level indicator. The resistances of all windings were measured before the tests and after of each stage of tests. The abstract of the protocol of temperature-rise test is given in Table No. 1. The summary of test results is given in Table 2 The temperature-rise of windings were calculated from the formula: R R1 R0 T = = R α R 0, Page 5 / 18

25 EWP/69/E/2011e Stage No. 1: Test at the rated load Test was performed according to the IEC sub-cl. 4.6, 7.2, IEC sub-cl. 8.1, 5.4 a) and , IEC sub-cl. 4,2, 7.2b). The voltage value 1,2 Un = 76,2 kv was applied to the P2/A terminal. The secondary voltage windings were loaded as follows:1a-1n 30 VA, cos = 1, at the voltage 100/ 3 V; 2a-2n 30 VA, cos = 1, at the voltage 100/ 3 V; 3a-3n 30 VA, cos = 1, at the voltage 100/ 3 V; 4a-4n 60 VA, cos = 1, at the voltage 100/ 3 V. The winding of residual voltage remained open. The secondary current windings of the CT were loaded as follows:1s1-1s2 90 VA, cos = 1; 2S1-2S2 45 VA, cos = 1; 5S1-3S2 45 VA, cos = 1; 6S1-6S2 60 VA, cos = 1. Supply (current control) was applied to the secondary current windings 3S1-3S2 and 4S1-4S2 (parallel connected). Terminals P1 and P2/A were short-circuited at the range 3000 A. The test was performed till reached steady state of the measured temperatures. Cross-sections of secondary current and voltage windings are given in Appendix. Stage No. 2: Test of 8 h Test was done immediately after the Stage No. 1 according to the IEC sub-cl. 4.6, 7.2, IEC sub-cl. 5.4 c), 8.1, and , IEC sub-cl. 4,2, 7.2b). The voltage value 1,9 Un = 119,7 kv was applied to the P2/A terminal. The secondary voltage windings were loaded as follows: 1a-1n 30 VA, cos = 1, at the voltage 100/ 3 V; 2a-2n 30 VA, cos = 1, at the voltage 100/ 3 V; 3a-3n 30 VA at the voltage 100/ 3 V; 4a-4n 60 VA, cos = 1, at the voltage 100/ 3 V. The residual winding da-dn was loaded by 450 VA, cos = 1, at the voltage 100/3 V. The secondary windings of the CT part were loaded by powers: 1S1-1S2 90 VA cos = 1; 2S1-2S2 45 VA cos = 1; 5S1-5S2 45 VA cos = 1; 6S1-6S2 60 VA, cos = 1. Supply (current control) was applied to the secondary current windings 3S1-3S2 and 4S1-4S2 (parallel connected). Terminals P1 and P2/A were short-circuited at the range 3000 A. The duration of the test was 8 h. da-dn winding was wound by profiled wire Cu 2 4,5 mm (25 turns), A-N winding was wound by wire Cu = 0,18 mm (47192 turns), remaining secondary current and voltage windings see Appendix. Stage No. 3: Test with thermal limit power Test was done immediately after Stage No. 2 according to the IEC sub-cl. 4.6, 7.2, IEC sub-cl. 5.4 a), 8.1, and , IEC sub-cl. 4,2, 7.2b). The voltage value Un = 63 kv was applied to the P2/A terminal. According to Manufacturers request secondary voltage windings (i.e. 1a-1n, 2a-2n, 3a-3n and 4a - 4n) were loaded by limit power 1000 VA at cos = 1. The residual winding remained open. The secondary current winding of the CT part were loaded as follows: 1S1-1S2 90 VA, cos = 1; 2S1-2S2 45 VA, cos = 1; 5S1-5S2 45 VA, cos = 1; 6S1-6S2 60 VA, cos = 1. Supply (current control) was applied to secondary current windings 3S1-3S2 and 4S1-4S2 (parallel connected). Terminals P1 and P2/A were short-circuited at the range 3000 A. The test was performed till reaching the steady state of the measured temperatures. Windings 1a-1n, 2a-2n, 3a-3n and 4a -4n were wound with profile wire Cu 1,5 4,5 mm (43 turns). Secondary current windings see Appendix. Page 6 / 18

26 EWP/69/E/2011e Measuring instruments The temperatures were measured by means of type K thermocouples (NiCr NiAl) with accuracy ± 0,6 o C 1. The ambient temperature was measured using four mercurial thermometers immersed into tank filled with oil. These thermometers were placed in the distance of 1 meter from the tested transformer at the height of 1 meter above floor- the accuracy of measurement ± 0,03 C 2. The resistance was measured by means of meter type 2291 manufactured by TETTEX Instruments with accuracy ± 0,01 mω 3 Fig. 1. Electrical diagram of terminal box of tested combined instrument transformer 1 The expanded uncertainty assigned corresponds to a coverage probability of 95 % and the coverage factor k = 2. 2 The expanded uncertainty assigned corresponds to a coverage probability of 95 % and the coverage factor k = 2. 3 The expanded uncertainty assigned corresponds to a coverage probability of 95 % and the coverage factor k = 2. Page 7 / 18

27 EWP/69/E/2011e Fig. 2. Arrangement of thermocouples during temperature-rise tests : 1- oil (over current coil); 2- head (contraction of the flange connecting the head with the insulator); 3- under the flange of tank lid; 4- lower tank (placed inside over earthing terminal); 5- terminal P1 (contraction in flat part); 6 terminal P2/A (3000 A, contraction in flat part). Page 8 / 18

28 EWP/69/E/2011e Table 1. Temperature-rise test results of combined instrument transformer PVA 123, serial no. 2GKP011K *) No. of thermocouple Stage No. 1 Temperature [ C] after heating time [h] ,57 19,30 21,77 24,25 26,08 27,83 31,05 32,23 34,50 35,25 34,15 36,03 35,53 36,80 36,70 39,43 39,03 39,90 40,06 41,00 41,36 41, ,57 18,05 20,80 22,77 24,25 25,50 27,55 28,58 29,28 30,25 30,80 28,13 31,45 33,00 32,93 35,01 27,28 35,25 35,20 35,78 36,08 36, ,82 14,07 14,32 14,92 16,82 17,00 16,60 17,27 17,27 18,05 17,22 17,30 14,65 17,52 16,77 18,57 17,67 17,75 17,80 17,85 18,00 17, ,32 14,47 14,57 14,60 17,07 17,35 17,27 17,85 17,87 18,32 18,02 17,97 17,57 17,95 17,60 19,15 18,27 18,05 18,50 18,60 18,30 18, ,32 35,80 37,01 37,16 39,03 40,33 42,18 41,33 40,18 41,98 41,70 40,88 41,75 43,36 44,00 45,01 45,01 44,83 44,63 45,00 45,18 44, ,57 36,28 36,78 37,21 39,38 40,98 42,43 41,70 40,65 42,31 42,18 41,26 42,36 44,00 44,38 45,36 45,31 45,06 45,11 45,36 45,68 45,41 Tot r, C 14,58 15,43 15,75 16,18 16,18 16,08 15,95 15,90 15,88 15,88 15,88 15,88 16,00 16,03 16,03 16,03 16,03 16,05 16,10 16,10 16,03 16,03 Uzas, kv 76,2 Izas 3S1-3S2//4S1-4S2, A 10,20 10,35 10,32 10,35 10,30 10,33 10,32 10,32 10,36 10,32 10,33 10,42 10,36 10,35 10,38 10,34 10,33 10,34 10,36 10,27 10,38 10,36 Iz, A IP2/A-N, ma R1S1-1S2, mω 508,20 523,62 530,91 535,28 542,38 548,37 555,50 560,89 566,07 572,14 576,78 580,93 583,76 589,30 593,27 596,71 601,28 604,07 606,98 610,51 614,13 616,01 R2S1-2S2, Ω 5,79 5,93 6,02 6,07 6,15 6,23 6,30 6,37 6,43 6,49 6,55 6,60 6,64 6,69 6,75 6,79 6,83 6,87 6,91 6,94 6,98 7,01 R3S1-3S2, mω 922, ,9 1057,2 1064,4 1074,5 1080,4 1088,0 1094,1 1099,7 1106,5 1112,4 1115,6 R4S1-4S2, mω 828, ,7 944,6 956,8 960,2 965,5 972,2 977,2 983,3 988,1 992,8 996,8 R5S1-5S2, Ω 10,62 10,83 10,96 11,07 11,20 11,34 11,49 11,60 11,72 11,84 11,94 12,03 12,11 12,27 12,30 12,38 12,46 12,54 12,60 12,68 12,74 12,79 R6S1-6S2, Ω 7,92 8,04 8,14 8,22 8,33 8,43 8,53 8,62 8,72 8,80 8,88 8,94 9,00 9,08 9,15 9,21 9,27 9,32 9,37 9,42 9,47 9,50 RP1-P2/A, mω 0, T1S1-1S2-7,59 11,17 13,32 16,81 19,76 23,27 25,92 28,47 31,45 33,74 35,78 37,17 39,90 41,85 43,54 45,79 47,16 48,59 50,33 52,11 53,04 T2S1-2S2-5,88 9,64 11,95 15,51 18,68 22,02 24,71 27,56 30,06 32,79 34,65 36,40 38,81 41,11 42,79 44,79 46,51 47,99 49,62 51,14 52,28 T3S1-3S ,48 36,55 38,50 41,24 42,84 44,90 46,55 48,07 49,91 51,51 52,38 T4S1-4S ,76 35,15 38,81 39,87 41,46 43,49 44,99 46,81 48,29 49,68 50,89 T5S1-5S2-4,92 7,88 10,50 13,67 16,97 20,31 23,06 25,86 28,52 31,02 33,14 34,92 38,76 39,54 41,28 43,26 45,04 46,60 48,31 49,73 50,88 T6S1-6S2-3,73 7,02 9,50 12,81 15,93 19,34 22,18 25,13 27,64 30,26 32,32 34,13 36,47 38,71 40,81 42,46 44,20 45,69 47,33 48,81 49,97 T P1-P2/A Page 9 / 18

29 EWP/69/E/2011e Table No. 1. cont. Stage No. 1, cont R1a-1n, mω 46,03 46,34 47,03 46,66 46,77 46,86 46,93 46,97 47,04 47,04 47,10 47,10 47,11 47,14 47,17 47,19 47,22 47,30 47,25 47,27 47,16 47,29 R2a-2n, mω 47,80 48,09 49,75 48,47 48,59 48,69 48,77 48,81 48,87 48,86 48,92 48,92 48,95 48,99 49,13 49,04 49,07 49,04 49,09 49,11 49,29 49,14 R3a-3n, mω 50,69 50,97 51,32 51,13 51,24 51,34 51,43 51,48 51,54 51,59 51,65 51,65 51,69 51,74 51,84 51,80 51,83 51,89 51,86 51,87 51,91 51,89 R4a-4n, mω 52,03 52,30 53,43 52,69 52,81 52,92 53,01 53,06 53,12 53,19 53,24 53,26 53,30 53,35 53,55 53,41 53,44 53,62 53,46 53,49 53,51 53,50 Rda-dn, mω 26,83 26,95 26,96 27,13 27,20 27,24 27,29 27,31 27,34 27,35 27,39 27,39 27,40 27,42 27,44 27,46 27,47 27,48 27,49 27,50 27,52 27,51 RP2/A-N, kω 19,16-19,85-20,11-20,18-20,14-20,33-20,50-20,60-20,70-20,80-20,80 - T1a-1n, - 1,66 5,43 3,43 4,00 4,50 4,91 5,13 5,47 5,47 5,83 5,79 5,85 6,05 6,20 6,31 6,49 6,89 6,64 6,76 6,16 6,82 T2a-2n, - 1,53 10,20 3,52 4,15 4,66 5,08 5,29 5,61 5,57 5,86 5,85 6,00 6,21 6,95 6,51 6,66 6,49 6,77 6,85 7,80 7,01 T3a-3n, T4a-4n, - 1,36 3,13 2,17 2,72 3,22 3,66 3,91 4,17 4,45 4,74 4,74 4,95 5,18 5,65 5,49 5,60 5,90 5,76 5,83 5,99 5,92-1,29 6,70 3,14 3,72 4,24 4,68 4,95 5,24 5,56 5,82 5,88 6,10 6,34 7,28 6,61 6,76 7,64 6,88 6,98 7,11 7,07 Tda-dn, - 1,16 1,19 2,80 3,43 3,81 4,31 4,53 4,78 4,88 5,20 5,20 5,37 5,51 5,73 5,85 5,99 6,09 6,19 6,28 6,40 6,34 TP2/A-N, - - 9,00 12,40 13,31 12,79 15,27 17,48 18,79 20,09 21,40 21,40 Deflection of the oil level indicator mm. 0 0,2 0,9 0,9 1 1,2 1,5 1,6 1,6 1,7 1,7 1,9 2,1 2,2 2,2 2,3 2,5 2,6 2,7 2,9 3 3 Page 10 / 18

30 EWP/69/E/2011e Table No. 1. cont. No. of thermocouple Temperature [ C] after heating time [h] Stage No. 1, cont. Stage No. 2 Stage No ,93 42,85 43,31 43,65 44,43 44,68 44,46 44,98 44,68 44,83 44,70 45,13 45,65 44,95 45,06 45,06 45,80 45,83 46, ,43 37,23 37,70 37,93 38,63 37,90 37,33 37,63 37,30 37,45 37,55 37,25 37,70 38,08 38,28 38,73 39,35 39,40 39, ,65 18,17 18,12 18,17 18,25 18,55 18,95 19,77 19,70 19,82 19,62 19,92 20,15 20,35 20,67 21,60 21,32 21,87 22, ,32 18,70 19,12 19,57 18,80 19,42 20,10 21,02 21,27 21,55 21,65 21,50 21,87 22,40 22,55 23,28 24,00 24,05 24, ,03 45,68 45,93 46,73 46,28 44,11 44,06 43,98 43,85 44,00 43,98 44,00 44,21 44,53 44,85 45,78 46,48 46,53 46, ,50 46,26 46,70 46,83 46,78 44,63 44,21 44,46 44,38 44,31 44,23 44,38 44,58 44,70 44,80 45,58 46,58 46,78 46,90 Tamb.avr, C 16,03 16,03 16,03 16,00 15,98 16,08 16,25 16,28 16,25 16,25 16,28 16,28 16,35 16,58 16,50 16,48 16,50 16,48 16,53 Usupply, kv 76,2 119,7 63 Isupp. 3S1-3S2//4S1-4S2, A 10,35 10,35 10,35 10,30 10,31 10,34 10,33 10,37 10,35 10,34 10,34 10,36 10,34 10,33 10,33 10,34 10,35 10,34 10,34 Iz, A IP2/A-N, ma R1S1-1S2, mω 617,95 620,38 622,79 624,75 625,96 627,25 629,55 630,30 632,16 632,84 633,37 635,39 634,78 635,58 637,48 637,14 637,30 638,27 639,15 R2S1-2S2, Ω 7,03 7,06 7,08 7,11 7,13 7,14 7,16 7,18 7,19 7,20 7,21 7,22 7,23 7,23 7,24 7,24 7,25 7,26 7,26 R3S1-3S2, mω 1119,3 1125,0 1127,9 1131,7 1134,5 1136,4 1139,5 1142,6 1144,3 1146,1 1147,9 1149,7 1150,7 1151,5 1152,7 1153,9 1155,1 1155,1 1157,5 R4S1-4S2, mω 1000,9 1004,9 1008,1 1011,4 1013,9 1016,2 1018,8 1021,1 1023,1 1024,6 1026,2 1027,7 1029,0 1029,4 1030,4 1031,2 1032,5 1032,4 1033,7 R5S1-5S2, Ω 12,84 12,89 12,93 12,98 13,01 13,04 13,08 13,10 13,13 13,15 13,17 13,19 13,21 13,21 13,22 13,23 13,25 13,25 13,27 R6S1-6S2, Ω 9,55 9,58 9,62 9,65 9,67 9,70 9,72 9,74 9,76 9,78 9,80 9,81 9,82 9,82 9,84 9,84 9,85 9,86 9,86 RP1-P2/A, mω ,025 T1S1-1S2 53,99 55,18 56,37 57,33 57,93 58,56 59,70 60,06 60,98 61,31 61,58 62,57 62,27 62,66 63,60 63,43 63,51 63,99 64,42 T2S1-2S2 53,48 54,67 55,67 56,63 57,50 58,18 58,94 59,67 60,24 60,77 61,19 61,67 62,04 62,17 62,42 62,61 62,98 63,19 63,48 T3S1-3S2 53,38 54,92 55,71 56,74 57,50 58,01 58,85 59,69 60,16 60,64 61,13 61,62 61,89 62,11 62,43 62,76 63,08 63,08 63,73 T4S1-4S2 52,14 53,35 54,32 55,31 56,07 56,76 57,55 58,24 58,84 59,30 59,78 60,23 60,62 60,75 61,05 61,29 61,68 61,65 62,04 T5S1-5S2 52,27 53,42 54,29 55,35 56,20 56,95 57,78 58,39 59,07 59,49 59,99 60,41 60,86 60,93 61,14 61,40 61,78 61,92 62,22 T6S1-6S2 51,30 52,45 53,50 54,46 55,32 56,08 56,81 57,55 58,11 58,65 59,16 59,58 59,98 60,04 60,45 60,51 60,82 61,11 61,36 T P1-P2/A ,34 Page 11 / 18

31 EWP/69/E/2011e Table No. 1, cont. Stage No. 1, cont. Stage No. 2, cont. Stage No. 3, cont R1a-1n, mω 47,29 47,30 47,31 47,33 47,35 47,82 48,36 48,64 48,79 48,72 48,78 48,83 48,87 50,07 50,37 50,64 50,81 50,87 50,92 R2a-2n, mω 49,13 49,15 49,16 49,17 49,18 49,72 50,29 50,34 50,44 50,64 50,73 50,78 50,81 52,31 52,62 52,82 53,04 53,25 53,23 R3a-3n, mω 51,90 51,92 52,02 51,94 51,96 52,84 53,18 53,35 53,50 53,58 53,68 53,72 53,77 55,11 55,47 55,69 55,94 55,93 56,05 R4a-4n, mω 53,51 53,52 53,68 53,56 53,56 54,56 54,91 55,10 55,27 55,34 55,46 55,50 55,54 57,00 57,42 57,65 57,95 57,97 58,05 Rda-dn, mω 27,52 27,52 27,53 27,53 27,53 28,12 28,34 28,42 28,53 28,56 28,59 28,64 28,64 29,45 29,75 29,89 30,07 30,09 30,12 RP2/A-N, kω 20,85-20,85-20,85-20,58-20,81-20,88-20,88-20,90-21,10-21,30 T1a-1n, 6,85 6,90 6,98 7,04 7,20 9,74 12,68 14,18 14,98 14,62 14,96 15,22 15,43 21,96 23,56 25,02 25,98 26,29 26,55 T2a-2n, 6,98 7,05 7,13 7,15 7,21 10,06 13,01 13,30 13,84 14,85 15,32 15,62 15,75 23,57 25,21 26,28 27,42 28,49 28,42 T3a-3n, T4a-4n, 5,96 6,06 6,54 6,17 6,24 10,61 12,27 13,12 13,88 14,25 14,73 14,95 15,19 21,81 23,58 24,67 25,91 25,86 26,44 7,12 7,15 7,90 7,33 7,33 12,14 13,80 14,74 15,54 15,91 16,45 16,67 16,85 23,87 25,87 27,01 28,42 28,54 28,92 Tda-dn, 6,40 6,43 6,54 6,58 6,58 12,02 14,05 14,85 15,87 16,15 16,41 16,91 16,87 24,41 27,20 28,51 30,23 30,39 30,64 TP2/A-N, 22,05 22,05 22,05 18,53 21,53 22,44 22,44 22,70 25,31 27,92 Deflection of the oil level indicator cm. 3,1 3,1 3,2 3,2 3,2 3,2 3,2 3,3 3,3 3,4 3,4 3,4 3,4 3,6 3,6 3,6 3,7 3,7 3,7 *) Marked with - are value not measured (agreed with Orderer) Iz test primary current Page 12 / 18

32 EWP/69/E/2011e Table No. 2. Temperature-rises [K] given during the tests Combined instrument transformer PVA 123 serial no. 2GKP011K *) Winding ϑ after Stage No. 1 ϑ after Stage No. 2 ϑ after Stage No. 3 ϑ dop 1S1-1S2 57,93 62,27 64,42 2S1-2S2 57,50 62,04 63,48 3S1-3S2 57,50 61,89 63,73 4S1-4S2 56,07 60,62 62,04 5S1-5S2 56,20 60,86 62,22 6S1-6S2 55,32 59,98 61,36 P1-P2/A Not measured Not measured 9,34 1a- 1n 7,20 15,43 26,55 2a-2n 7,21 15,75 28,42 3a-3n 6,24 15,19 26,44 4a-4n 7,33 16,85 28,92 da-dn 6,58 16,87 30,64 P2/A-N 22,05 22,44 27, ) 3) 75 2)3) Thermocouple No. Location ϑ after Stage No. 1 ϑ after Stage No. 2 ϑ after Stage No. 3 ϑ dop 1), 2), 3) 1 Oil 28,46 29,3 29, Head top part next to terminal 3 Under the tank lid from side of terminal box 4 Enclosure of lower tank 5 Terminal P1 (contraction in flat part) 6 Terminal P2/A (contraction in flat part) 22,65 21,35 23,23 2,27 3,80 5,5 2,82 5,52 7,6 40 4) 30,31 27,86 30, ) 30,8 28,23 30, ) 1) acc. to IEC :1996, 2) acc. to IEC :1997, 3) acc. to IEC :2002, ϑ - temperature-rise; 4) acc. to IEC :2007, ϑ dop permitted value in steady state Page 13 / 18

33 EWP/69/E/2011e 6. Summary In tested combined instrument transformer type PVA 123, with composite insulator, as results of temperature rise test with current I cth = 3000 A: - in steady state, at the rated load of secondary current and voltage windings (without residual winding), at cos = 1 and supply voltage 1,2U n (Stage No. 1), permitted temperature-rise limits were not exceeded. The tested combined transformer met requirements of IEC :2002, IEC :1996, IEC : 1997, IEC :1997/A2:2002 and IEC : 2007 standards. - results of test 8 h at supply voltage 1,9U n and rated load of current and voltage windings at cos = 1 and load of residual winding with thermal limit power (Stage No. 2), shows that permitted temperature-rise limits were not exceeded. The tested combined transformer met requirements of IEC :2002, IEC :1996, IEC : 1997, IEC :1997/A2:2002 and IEC : 2007 standards. - results of test with thermal limit power (Stage No. 3) at rated load of current windings at cos = 1 and supply voltage U n, and at the same time loading of all voltage windings (without residual windings) with thermal limit power, shows that permitted temperature-rise limits were not exceeded. The tested combined transformer met requirements of IEC :2002, IEC :1996, IEC : 1997, IEC :1997/A2:2002 and IEC : 2007 standards. 7. Opinions and interpretations None Page 14 / 18

34 EWP/69/E/2011e 8. Photographic documentation Photograph No. 1. Combined transformer on the test stand during temperature-rise test. Photograph No. 2. The conductors short-circuiting of P1-P2A terminals. Page 15 / 18

35 EWP/69/E/2011e Photograph No. 3. Terminal box of tested combined transformer during temperature-rise test. Page 16 / 18

36 EWP/69/E/2011e Documentation delivered by the Orderer APPENDIX Page 17 / 18

37 EWP/69/E/2011e Page 18 / 18