KEMA INSPECTION REPORT

Transcription

1 KEMA INSPECTION REPORT Object Power cable system consisting of a single core power cable, outdoor termination, GIS termination and a joint 127/220 (245) kv 1x1000 mm 2 Cu XLPE Client GAON Cable, Ltd., Gunpo, Korea Manufacturer Cable GAON Cable, Ltd., Gunpo, Korea Accessory 1 Accessory 2 Accessory 3 Reference Inspected by Test location KEMA Nederland B.V., Arnhem, The Netherlands LS Cable & System Ltd., Gumi, Korea LS Cable & System Ltd., Gumi, Korea LS Cable & System Ltd., Gumi, Korea LS Cable & System Ltd., Gumi, Korea Date of tests 11 August to 13 October 2015 Test specification Remarks The tests have been carried out in accordance with client s instruction. Test procedure and test parameters were in accordance with IEC (2011). The object passed the tests. This report applies only to the object tested. The responsibility for conformity of any object having the same type references as that tested rests with the Manufacturer. This report consists of 75 pages in total. KEMA Nederland B.V. J.P. Fonteijne Executive Vice President KEMA Laboratories Arnhem, 1 December 2015 Copyright: Only integral reproduction of this report is permitted without written permission from DNV GL. Electronic copies as PDF or scan of this report may be available and have the status for information only. The sealed and bound version of the report is the only valid version.

2 KEMA Laboratories TABLE OF CONTENTS 1 IDENTIFICATION OF THE OBJECT TESTED Ratings/characteristics of the object tested Characteristics of the cable system Characteristics of the cable Characteristics of the accessories List of drawings 10 2 GENERAL INFORMATION Persons attending the inspection The inspection was carried out by Purpose of the tests Inspection of the test set-up 11 3 ELECTRICAL TYPE TESTS ON COMPLETE CABLE SYSTEM Test arrangement Determination of the cable conductor temperature Test set-up Photograph of test set-up Test voltage values Bending test Partial discharge test at ambient temperature Tan δ measurement Heating cycle voltage test Partial discharge test at ambient temperature Partial discharge test at high temperature Lightning impulse voltage test Power frequency voltage test Tests of outer protection for joints Thermal cycles without voltage on a separate joint Water immersion and heat cycling DC voltage tests on assemblies embodying sheath sectionalising insulation Impulse voltage tests of each part to earth Impulse voltage tests between parts Examination of test assembly Examination Examination of cable and accessories Photographs Resistivity of semi-conducting screens 62 4 NON-ELECTRICAL TYPE TESTS ON CABLE COMPONENTS AND ON COMPLETE CABLE Check of cable construction 63

3 KEMA Laboratories Tests for determining the mechanical properties of insulation before and after ageing Tests for determining the mechanical properties of oversheaths before and after ageing Ageing tests on pieces of complete cable to check compatibility of materials Pressure test at high temperature on oversheath Hot set test for XLPE insulation Measurement of carbon black content of black PE oversheaths Water penetration test 71 5 DRAWINGS... 72

4 KEMA Laboratories IDENTIFICATION OF THE OBJECT TESTED 1.1 Ratings/characteristics of the object tested Characteristics of the cable system Rated voltage, U 0 /U (U m ) 127/220 (245) kv Rated maximum conductor temperature 90 C Rated conductor cross-section 1000 mm 2 Composition of the cable system: cable 220 kv 1x1000 mm 2 Cu, XLPE accessory kv porcelain outdoor termination accessory kv GIS termination accessory kv cross-bonding joint The test voltages and calculated nominal field stresses were based on U 0 test = 127 kv Characteristics of the cable Standard IEC 62067, Clause 6 Manufacturer (as stated by the client) GAON Cable, Ltd., Gunpo, Korea Type U 0 = 127 kv 1x1000 mm 2 XLPE CABLE Manufacturing year 2015 Rated voltage, U 0 /U (U m ) 127/220 (245) kv Overall diameter (D) 116 mm Calculated nominal electrical stress at 8,1 kv/mm conductor screen at U 0 = 127 kv (E i ) Calculated nominal electrical stress at 3,9 kv/mm insulation screen at U 0 = 127 kv (E o ) Nominal capacitance between conductor 0,192 µf/km and metal screen Marking on the oversheath 220KV CLE/WS-W 1CX1000SQMM GAON CABLE 2015 Construction see List of drawings

5 KEMA Laboratories Conductor material plain annealed copper wire DC conductor resistance 0,0176 Ω/km cross-section 1000 mm 2 nominal diameter (d) 38,7 mm type compacted stranded segmented number and nominal diameter of wires 148 wires Ø 2,5 mm and 96 wires Ø 2,4 mm maximum conductor temperature in 90 C normal operation milliken conductor and non-conductive yes, non-conductive swellable tape swellable tape between segments presence and nature of measures to yes, non-conductive swellable tape achieve longitudinal watertightness number of layers of swelling tapes 4 nominal thickness and width of tape 0,25 x 20 / 35 / 55 / 75 mm material designation non-woven fabric manufacturer of the material known in KEMA's files Conductor screen material semi-conductive thermosetting compound nominal thickness 1,5 mm material designation known in KEMA's files manufacturer of the material known in KEMA's files Insulation material XLPE nominal thicknes 23,0 mm nominal inner diameter of the insulation 43,2 mm nominal outer diameter of the insulation 89,2 mm material designation known in KEMA's file manufacturer of the material known in KEMA's files Insulation (core) screen material semi-conductive thermosetting compound nominal thickness 1,2 mm material designation known in KEMA's files manufacturer of the material known in KEMA's files Longitudinally watertightness presence and nature of measures to yes, semi-conductive swellable tape achieve longitudinal watertightness along insulation screen number of swelling tapes 2 (under and over metal screen) nominal thickness and width 0,3 x 100 mm, 20% overlap (under) 0,45 x 100 mm, 50% overlap (over) material designation non-woven fabric manufacturer of the material known in KEMA's files

6 KEMA Laboratories Metal screen material copper wires number of wires 94 nominal diameter of wires 1,7 mm number of tapes 1 nominal thickness and width of tape 0,13 x 10 mm, open helix cross-sectional area 213 mm 2 DC resistance 0,08348 Ω/km manufacturer of the material known in KEMA's files Metal sheath material lead alloy nominal thickness 3,1 mm type extruded manufacturer of the material known in KEMA's files Bitumen material asphalt nominal thickness 0,2 mm Oversheath material PE type ST 7 nominal thickness 5,0 mm nominal overall diameter of the cable 116,0 mm (D) material designation known in KEMA's files manufacturer of the material known in KEMA's files colour black graphite coating applied yes Manufacturing details insulation system location of manufacturing Gunpo, Gyeonggi-do, Korea type of extrusion line CCV type of extrusion triple extrusion factory identification of extrusion line PIX04 manufacturer of the extrusion line SIMEC identification of production batch none curing means nitrogen cooling means water

7 KEMA Laboratories Characteristics of the accessories Accessory 1 Outdoor termination with porcelain insulator for polymeric extruded power cable Standard IEC 62067, Clause 7 Manufacturer (as stated by the client) LS Cable & System Ltd., Gumi, Korea Type premoulded Type designation Manufacturing year 2015 Quantity submitted 2 Rated voltage, U 0 /U (U m ) 127/220 (245) kv Creepage distance min mm Flashover distance 2670 mm Number of sheds 36 large and 36 small (alternating) Insulator type of insulator porcelain type designation 5729N manufacturer Puci, China colour of insulator brown pedestal insulators yes, 4 Conductor connector type, reference number manufacturer LS Cable & System Ltd., Gumi, Korea assembly technique compressed tooling, dies and necessary setting 57 mm hexagonal dies Stress cone type of stress cone moulded silicone rubber type designation manufacturer LS Cable & System Ltd., Gumi, Korea Insulating medium insulating medium polybutene oil type designation known in KEMA s files manufacturer known in KEMA s files Installation instruction see List of drawings

8 KEMA Laboratories Accessory 2 Cable connection for gas-insulated metal-enclosed switchgear for polymeric extruded power cable Standard IEC 62067, Clause 7 Manufacturer (as stated by the client) LS Cable & System Ltd., Gumi, Korea Type prefabricated, plug-in Type designation Manufacturing year 2015 Quantity submitted 2 Rated voltage, U 0 /U (U m ) 127/220 (245) kv Insulator type of insulator manufacturer colour of insulator epoxy insulator LS Cable & System Ltd., Gumi, Korea epoxy natural (white) Conductor connector type, reference number manufacturer LS Cable & System Ltd., Gumi, Korea assembly technique compressed tooling, dies and necessary setting 63 mm hexagonal dies Stress cone type of stress cone moulded silicone rubber type designation manufacturer LS Cable & System Ltd., Gumi, Korea Installation instruction see List of drawings

9 KEMA Laboratories Accessory 3 Joint with screen interruption for polymeric extruded power cable Standard IEC 62067, Clause 7 Manufacturer (as stated by the client) LS Cable & System Ltd., Gumi, Korea Type of joint straight with screen interruption Type designation, reference number Manufacturing year 2015 Quantity submitted 1 Rated voltage, U 0 /U (U m ) 127/220 (245) kv Length of the bonding leads >3 m and 10 m Conductor connector type, reference number manufacturer LS Cable & System Ltd., Gumi, Korea assembly technique compressed tooling, dies and necessary setting 57 mm hexagonal dies Joint body type moulded silicone rubber type designation manufacturer LS Cable & System Ltd., Gumi, Korea Joint outer protection May be subjected to wet conditions in service yes Installation instruction see List of drawings

10 KEMA Laboratories List of drawings The manufacturer has guaranteed that the object submitted for tests has been manufactured in accordance with the following drawings and/or documents. KEMA has verified that these drawings and/or documents adequately represent the object tested. The manufacturer is responsible for the correctness of these drawings and/or documents and the technical data presented. The following drawings and/or documents have been included in this report: Drawing no./document no. Revision GO 52AK-KME1 - UEMA27Q002 0 UEPG27Q004 0 UEMK27Q001 0 The following drawings and/or documents are only listed for reference and are kept in KEMA s files Drawing no./document no. Revision UOMA22500A_IN - UOPG22500H_QA - UOMK225002_IN -

11 KEMA Laboratories GENERAL INFORMATION 2.1 Persons attending the inspection Name Mr Hwang Chung-Ryul Mr Ahn Dong-Sung Mr Choi Rak-Eun Mr Park Young-Wook Company GAON Cable, Ltd., Gunpo, Korea LS Cable & System Ltd., Gumi, Korea 2.2 The inspection was carried out by Name Mr Mark van Vliet Mr Kees van t Hul Mr Edwin Pultrum Company KEMA Nederland B.V., Arnhem, The Netherlands 2.3 Purpose of the tests Purpose of the tests was to verify whether the material complies with the specified requirements. 2.4 Inspection of the test set-up The tests were carried out in the laboratory of the manufacturer, who is therefore jointly responsible for the correctness of the results obtained. The measuring devices and the test set-up were checked by KEMA and were calibrated when necessary. Result The inspection did not give rise to remarks.

12 KEMA Laboratories ELECTRICAL TYPE TESTS ON COMPLETE CABLE SYSTEM 3.1 Test arrangement Determination of the cable conductor temperature Standard Standard IEC 62067, Annex A, Subclause A.3.1 For the tests with the cable system at elevated temperature, a reference loop for temperature control of the conductor was installed and conductor current was used for heating. The reference cable was cut from the total cable length intended for the type test. This reference loop was installed close to the test loop in order to create the same environmental conditions as for the test loop. The heating currents in the reference loop and the test loop were kept equal at all times, thus the conductor temperature of the reference loop is representative for the conductor temperature of the test loop. Annex A was used as a guide and Subclause A.3.1, method 1 was applied. The tests at elevated temperature are carried out after the conductor temperature has been within the stated limit for at least 2 hours.

13 KEMA Laboratories Test set-up In order to perform the test, the following test loop was prepared by the manufacturer s representatives in the manner specified by the manufacturer s instructions: cross-bonding joint three pieces of power cable type U 0 = 127 kv 1x1000 mm 2 XLPE CABLE, respectively 7, 14½ and 7 meters long two outdoor terminations (both with porcelain insulator) two SF 6 -insulated terminations mounted in a back-to-back configuration inside a SF 6 -gas filled container one cross-bonding slip-on joint. The outer protection of the joint was fitted.

14 KEMA Laboratories Photograph of test set-up

15 KEMA Laboratories Test voltage values Standard and date Standard IEC 62067, Subclause Test date 12 August 2015 Characteristic test data Length of cable sample 0,5 m Nominal insulation thickness (mm) Measured average insulation thickness (mm) 23,0 22,76-1 Deviation of measured average insulation thickness from nominal insulation thickness (%) Procedure Prior to the electrical tests, the insulation thickness was measured by the method specified in Subclause 8.1 of IEC on a cable sample with a length of approximately 0,5 m, to check that the thickness is not excessive compared with the nominal value. Requirement If the average thickness of the insulation does not exceed the nominal value by more than 5%, the test voltages shall be the values specified in Table 4 for the rated voltage of the cable. If the average thickness of the insulation exceeds the nominal value by more than 5% but by not more than 15%, the test voltage shall be adjusted to give an electrical stress at the conductor screen equal to that applying when the average thickness of the insulation is equal to the nominal value, and the test voltages are the normal values specified for the rated voltage of the cable. The cable length used for the electrical type tests shall not have an average thickness exceeding the nominal value by more than 15%. Result The measured average insulation thickness did not exceed the nominal value by more than 5%. The voltage tests can be performed with the values specified before.

16 KEMA Laboratories Bending test Standard and date Standard IEC 62067, Subclause Test date 12 August 2015 Environmental conditions Ambient temperature 25 C Characteristic test data Temperature of test object 25 C Maximum bending diameter 25(d + D) + 5% Length of cable bended 85 m Length marking of cable bended Nominal outer diameter of cable D (mm) Nominal diameter of cable conductor d (mm) Maximum required bending diameter D r (mm) 115,2 378, Diameter of test cylinder D t (mm) Procedure The cable sample was bent around a test cylinder at ambient temperature for at least one complete turn and unwound, without axial rotation. The sample then was rotated through 180 and the process repeated. This cycle of operation was carried out three times in total. Result The test was carried out successfully.

17 KEMA Laboratories Partial discharge test at ambient temperature Standard and date Standard IEC 62067, Subclause Test date 14 September 2015 Environmental conditions Ambient temperature 20 C Characteristic test data Temperature of test object 20 C Circuit direct Calibration 5 pc Noise level at 1,5 U 0 1,5 pc Declared sensitivity 3 pc Required sensitivity 5 pc Test frequency 60 Hz Assembly Voltage applied, 60 Hz Duration Partial discharge level... x U 0 (kv) (s) (pc) Cable system 1, , Not detectable Procedure After the bending test the partial discharge test was performed in accordance with IEC at ambient temperature. The sensitivity of the measuring circuit was checked with a calibrator. The voltage was raised gradually to and held at 1,75 U 0 for 10 s and then slowly reduced to 1,5 U 0. At this voltage the partial discharges were measured. Requirement There shall be no detectable discharge exceeding the declared sensitivity from the test object at 1,5 U 0. Result The object passed the test.

18 KEMA Laboratories Tan δ measurement Standard and date Standard IEC 62067, Subclause Test date 15 September 2015 Environmental conditions Ambient temperature 20 C Characteristic test data Temperature of test object 95 C Assembly Voltage applied, 60 Hz (kv) Tan δ Cable system 127 4,5 x 10-4 Procedure The measurement was performed on the cable system (cable with accessories) under test. The cable system was heated by conductor current, until the conductor reached a temperature of 5 K to 10 K above the maximum conductor temperature in normal operation. The tan δ was measured at a power frequency voltage of U 0 at the temperature specified above. Requirement The measured value shall not be higher than 10 x 10-4 at U 0. Result The object passed the test.

19 KEMA Laboratories Heating cycle voltage test Standard and date Standard IEC 62067, Subclause Test date 16 September to 11 October 2015 Environmental conditions Ambient temperature C Characteristic test data Heating method conductor current Stabilized temperature 97 C Diameter of U-bend 4000 mm No. of heating cycles Required steady conductor temperature Heating cycle Heating Total duration Duration of conductor at steady temperature Cooling Total duration Voltage, 60 Hz Total duration Voltage applied 2 U 0 ( C) (h) (h) (h) (h) (kv) Procedure The assembly was heated by conductor current, until the cable conductor reached a steady temperature 5 K to 10 K above the maximum conductor temperature in normal operation. The heating was applied for at least 8 h. The conductor temperature was maintained within the stated temperature limits for 2 h of each heating period. This was followed by at least 16 h of natural cooling to a conductor temperature less than or equal to 30 C or within 15 K of ambient temperature, whichever is the higher, but with a maximum of 45 C. The conductor current during the last 2 h of each heating period was recorded. The cycle of heating and cooling was carried out 20 times. During the whole of the test period a voltage of 2 U 0 was applied to the assembly. Requirement No breakdown shall occur. Result The object passed the test.

20 KEMA Laboratories Partial discharge test at ambient temperature Standard and date Standard IEC 62067, Subclause Test date 12 October 2013 Environmental conditions Ambient temperature 21 C Characteristic test data Temperature of test object 21 C Circuit direct Calibration 5 pc Noise level at 1,5 U 0 < 0,5 pc Declared sensitivity < 1 pc Required sensitivity 5 pc Test frequency 60 Hz Assembly Voltage applied, 60 Hz Duration Partial discharge level... x U 0 (kv) (s) (pc) Cable system 1, , Not detectable Procedure After the heating cycle voltage test the partial discharge test was performed in accordance with IEC at ambient temperature. The sensitivity of the measuring circuit was checked with a calibrator. The voltage was raised gradually to and held at 1,75 U 0 for 10 s and then slowly reduced to 1,5 U 0. At this voltage the partial discharges were measured. Requirement There shall be no detectable discharge exceeding the declared sensitivity from the test object at 1,5 U 0. Result The object passed the test.

21 KEMA Laboratories Partial discharge test at high temperature Standard and date Standard IEC 62067, Subclause Test date 12 October 2015 Environmental conditions Ambient temperature 21 C Characteristic test data Temperature of test object 98 C Circuit direct Calibration 5 pc Noise level at 1,5 U 0 < 0,5 pc Declared sensitivity < 1 pc Required sensitivity 5 pc Test frequency 60 Hz Assembly Voltage applied, 60 Hz Duration Partial discharge level... x U 0 (kv) (s) (pc) Cable system 1, , Not detectable Procedure After the heating cycle voltage test the partial discharge test was performed in accordance with IEC at high temperature. The conductor was heated by conductor current. During the last 2 h of the heating period the conductor was at a temperature of at least 5 K to 10 K above the maximum cable conductor temperature in normal operation. The sensitivity of the measuring circuit was checked with a calibrator. The voltage was raised gradually to and held at 1,75 U 0 for 10 s and then slowly reduced to 1,5 U 0. At this voltage the partial discharges were measured. Requirement There shall be no detectable discharge exceeding the declared sensitivity from the test object at 1,5 U 0. Result The object passed the test.

22 KEMA Laboratories Lightning impulse voltage test Standard and date Standard IEC 62067, Subclause Test date 12 October 2015 Environmental conditions Ambient temperature 21 C Characteristic test data Temperature of test object 98 C Specified test voltage 1050 kv Testing arrangement Polarity Voltage applied No. of impulses Voltage applied to Earthed (% of test voltage) See figure on next pages Conductor Metal Positive screens , 2, 3 Conductor Metal Negative screens , 5, 6 Procedure The test set-up was tested with a lightning impulse voltage while the conductor was heated by conductor current. The conductor was heated at a temperature of 5 K to 10 K above the maximum conductor temperature in normal operation and was maintained within the stated temperature limits for at least 2 h. The test was applied according to the procedure given in IEC Requirement The assembly shall withstand without failure or flashover 10 positive and 10 negative voltage impulses. Result The object passed the test.

23 KEMA Laboratories Lightning impulse test with positive voltage Figure 1: first impulse at +100% of test voltage

24 KEMA Laboratories Figure 2: fifth impulse at+100% of test voltage

25 KEMA Laboratories Figure 3: tenth impulse at +100% of test voltage

26 KEMA Laboratories Lightning impulse test with negative voltage Figure 4: first impulse at -100% of test voltage

27 KEMA Laboratories Figure 5: fifth impulse at -100% of test voltage

28 KEMA Laboratories Figure 6: tenth impulse at -100% of test voltage

29 KEMA Laboratories Power frequency voltage test Standard and date Standard IEC 62067, Subclause Test date 12 October 2015 Environmental conditions Ambient temperature 21 C Characteristic test data Temperature of test object C Testing arrangement Voltage applied, 60 Hz Duration Voltage applied to Earth connected to x U 0 (kv) (min) Conductors Metal screens Procedure After the lightning impulse voltage test, the assembly was subjected to a power frequency voltage test at 2 U 0 for 15 min. The test was carried out during the cooling period. Requirement No breakdown of the insulation shall occur. Result The object passed the test.

30 KEMA Laboratories Tests of outer protection for joints These tests were applied to a separate joint Thermal cycles without voltage on a separate joint Standard and date Standard IEC 62067, Annex G, Clause G.2 Test date 13 September to 16 September 2015 Environmental conditions Ambient temperature C Characteristic test data Heating method conductor current Stabilized temperature 97 C No. of heating cycles Required steady conductor temperature Heating cycle Heating Total duration Duration of conductor at steady temperature ( C) (h) (h) (h) Cooling Total duration Procedure On a separate joint in dry conditions at least 3 thermal cycles without voltage were performed. Each cycle of heating and cooling consisted of at least 8 h heating and at least 16 h of natural cooling to a temperature less than or equal to 30 C or within 15 K of ambient temperature, whichever is the higher, but with a maximum of 45 C. During the last 2 h of each heating period the temperature of the conductor was steady between 95 C and 100 C (5 K to 10 K above the maximum conductor temperature in normal operation). Result The test was carried out successfully.

31 KEMA Laboratories Water immersion and heat cycling Standard and date Standard IEC 62067, Annex G, Clause G.3 Test date 16 September to 26 September 2015 Environmental conditions Ambient temperature C Characteristic test data Heating method raising the water temperature by heating Stabilized temperature 74 C Cooling method diluting the water with water with a lower temperature Water height 1 m above highest point of outer protection No. of heating cycles Required steady water temperature Heating cycle Heating Total duration Duration of water steady temperature ( C) (h) (h) (h) Cooling Total duration Procedure The test assembly was immersed in water to a depth of at least 1 m at the highest point of the outer protection. The test set-up was subjected to at least 20 heating/cooling cycles by raising the water temperature to within 15 K to 20 K below the maximum temperature of the cable conductor in normal operation. In each cycle the water was raised to the specified temperature, maintained at that level for at least 5 h and then was permitted to cool down to within 10 K above ambient temperature. The minimum duration of each heating cycles was 12 h and the duration for raising the water temperature to the specified temperature was as much as possible the same as the duration for cooling the water equal to or less than 30 C or 10 K above the ambient temperature, whichever was the higher. Result The test was carried out successfully.

32 KEMA Laboratories DC voltage tests on assemblies embodying sheath sectionalising insulation Standard and date Standard IEC 62067, Annex G, Subclause G Test date 12 October 2015 Environmental conditions Ambient temperature 21 C Characteristic test data Water temperature 21 C Testing arrangement DC voltage applied Duration Voltage applied to Earth connected to (kv) (min) Metal screen/sheath of the power cable sides 1 and 2 Metal screen/sheath of the power cable side 1 Metal screen/sheath of the power cable side 2 exterior of the outer protection Metal screen/sheath of the power cable side 2 + exterior of the outer protection Metal screen/sheath of the power cable side 1 + exterior of the outer protection Procedure On completion of the heating cycles, and with the test assembly still immersed, a DC test voltage of 25 kv was applied 1 min. between the metal screens/sheaths of the power cable, at either end of the accessory, and also between the metal screens/sheaths and the earthed exterior of the joint outer protection. Requirement No breakdown shall occur during the tests. Result The object passed the test.

33 KEMA Laboratories Impulse voltage tests of each part to earth Standard and date Standard IEC 62067, Annex G, Subclause G Test date 12 October 2015 Environmental conditions Ambient temperature 21 C Characteristic test data Length of bonding leads Specified test voltage >3 m 47,5 kv Testing arrangement Polarity Voltage applied No. of impulses See figure on next pages Voltage applied to Earthed (% of test voltage) Metal Exterior of the Positive screen/sheath of outer protection the power cable side , 2, 3 Negative , 5, 6 Procedure To test each part to earth, a test voltage in accordance with Table G.1 was applied between the interconnected metal screens/sheaths and the exterior of the assembly whilst immersed. The test was carried out in accordance with IEC The joint was at ambient temperature. The test set-up was tested with 10 positive and 10 negative impulses. Requirement No breakdown shall occur during the tests. Result The object passed the test.

34 KEMA Laboratories Impulse test with positive voltage Figure 1: first impulse at +100% of test voltage

35 KEMA Laboratories Figure 2: fifth impulse at +100% of test voltage

36 KEMA Laboratories Figure 3: tenth impulse at +100% of test voltage

37 KEMA Laboratories Impulse test with negative voltage Figure 4: first impulse at -100% of test voltage

38 KEMA Laboratories Figure 5: fifth impulse at -100% of test voltage

39 KEMA Laboratories Figure 6: tenth impulse at -100% of test voltage

40 KEMA Laboratories Impulse voltage tests between parts Standard and date Standard IEC 62067, Annex G, Subclause G Test date 12 October 2015 Environmental conditions Ambient temperature 21 C Characteristic test data Length of bonding leads Specified test voltage > 3 m 95 kv Testing arrangement Polarity Voltage applied No. of impulses Voltage applied to Earthed (% of test voltage) Metal screen/sheath of the power cable side 1 Metal screen/sheath of the power cable side 2 Metal screen/sheath of the power cable side 2 Metal screen/sheath of the power cable side 1 See figure on next pages Positive , 2, 3 Negative , 5, 6 Positive , 8, 9 Negative , 11, 12 Procedure The test assembly remained in the water. The impulse test was carried out in accordance with IEC The joint was at ambient temperature. The test set-up was tested with 10 positive and 10 negative impulses. Requirement No breakdown shall occur during the tests. Result The object passed the test.

41 KEMA Laboratories Impulse test with positive voltage (impulse applied to side 1, side 2 earthed) Figure 1: first impulse at +100% of test voltage

42 KEMA Laboratories Figure 2: fifth impulse at +100% of test voltage

43 KEMA Laboratories Figure 3: tenth impulse at +100% of test voltage

44 KEMA Laboratories Impulse test with negative voltage (impulse applied to side 1, side 2 earthed) Figure 4: first impulse at -100% of test voltage

45 KEMA Laboratories Figure 5: fifth impulse at -100% of test voltage

46 KEMA Laboratories Figure 6: tenth impulse at -100% of test voltage

47 KEMA Laboratories Impulse test with positive voltage (impulse applied to side 2, side 1 earthed) Figure 7: first impulse at +100% of test voltage

48 KEMA Laboratories Figure 8: fifth impulse at +100% of test voltage

49 KEMA Laboratories Figure 9: tenth impulse at +100% of test voltage

50 KEMA Laboratories Impulse test with negative voltage (impulse applied to side 2, side 1 earthed) Figure 10: first impulse at -100% of test voltage

51 KEMA Laboratories Figure 11: fifth impulse at -100% of test voltage

52 KEMA Laboratories Figure 12: tenth impulse at -100% of test voltage

53 KEMA Laboratories Examination of test assembly Standard and date Standard IEC 62067, Annex G, Clause G.5 Test date 12 October 2015 Procedure On completion of all tests of Annex G, Clause G.4, the joint was dismantled and inspected. Requirement Joint outer protection boxes filled with removable compounds shall be regarded as satisfactory if there is no visible evidence of internal void or internal displacement of compound by water ingress, or of compound loss via the various seals or box walls. For joint outer protections employing alternative designs and materials, there shall be no evidence of water ingress or internal corrosion. The declared water barrier is the filling compound and there shall be no water inside of the water barrier. Result The object passed the test.

54 KEMA Laboratories Photographs

55 KEMA Laboratories

56 KEMA Laboratories

57 KEMA Laboratories Examination Examination of cable and accessories Standard and date Standard IEC 62067, Subclause Test date 13 October 2015 Termination Item Unit Nominal value Measured/determined Creepage distance mm min approx Flashover distance mm Number of sheds - 36 large + 36 small 36 large + 36 small Procedure Upon completion of all tests the cable and the accessories were dismantled and examined, with normal or corrected vision without magnification, for signs of deterioration (e.g. electrical degradation, leakage, corrosion or harmful shrinkage). Requirement Examination of the cable and accessories shall reveal no signs of deterioration (e.g. electrical degradation, leakage, corrosion or harmful shrinkage) which could affect the system in service operation. Result No signs of electrical degradation, leakage, corrosion or harmful shrinkage which could affect the system in service operation were detected.

58 KEMA Laboratories Photographs Cable

59 KEMA Laboratories Joint

60 KEMA Laboratories GIS termination

61 KEMA Laboratories Outdoor termination

62 KEMA Laboratories Resistivity of semi-conducting screens Standard and date Standard IEC 62067, Subclause Test date 13 October 2015 Characteristic test data Temperature during ageing 100 C Duration 7 x 24 h Resistivity measured at 90 ± 2 C Item Unit Requirement Measured/determined Conductor screen without ageing Ωm ,9 after ageing Ωm ,3 Insulation screen without ageing Ωm 500 2,3 after ageing Ωm 500 6,1 Procedure The measurement of resistivity of the cable semi-conducting screens was made on a separate sample. The resistivity of the extruded semi-conducting screens applied over the conductor and over the insulation was determined by measurements on test pieces taken from the core of a sample of cable as manufactured, and from a sample of cable which had been subjected to the ageing treatment, to test the compatibility of component materials as specified in Subclause The test procedure was in accordance with Annex D. The measurement was made at a temperature within ± 2 K of the maximum conductor temperature in normal operation. Result The object passed the test.

63 KEMA Laboratories NON-ELECTRICAL TYPE TESTS ON CABLE COMPONENTS AND ON COMPLETE CABLE 4.1 Check of cable construction Standard and date Standard IEC 62067, Subclause Test date 12 August 2015 Item Unit Requirement Specified Measured/determined Conductor Diameter of conductor mm - 38,7 38,73 Number of segments Number of wires Semi-conducting conductor screen Nominal thickness mm - 1,50 - Average thickness mm - - 2,10 Minimum thickness mm - - 1,694 Insulation Nominal thickness mm - 23,0 - Average thickness mm ,76 Minimum thickness [t min ] mm 20,7 20,7 21,821 Maximum thickness [t max ] mm ,401 (t max t min ) / t max - 0,10-0,0675 Semi-conducting insulation screen Nominal thickness mm - 1,20 - Average thickness mm - - 1,51 Minimum thickness mm - - 1,392 Outer diameter mm ,0 Semi-conducting water blocking layer Number of layers Thickness of layers mm - 0,3 / 0,45 0,30 / 0,38 Width of layers mm ,34 Copper screen Number of Cu wires Diameter of Cu wires mm - 1,70 1,731 Dimensions of Cu tape mm - 10 x 0,13 10,01 x 0,102

64 KEMA Laboratories Item Unit Requirement Specified Measured/determined Lead alloy sheath Nominal thickness mm - 3,1 - Average thickness mm - - 3,761 Minimum thickness mm 2,845 2,845 3,417 Bitumen layer Nominal thickness mm - 0,2 - Average thickness - - not determined Oversheath Nominal thickness mm - 5,0 - Average thickness mm - - 5,843 Minimum thickness mm 4,15 4,15 5,576 Outer diameter mm ,9 Graphite coating - - yes yes Colour of the oversheath - - black black Marking on oversheath 220KV CLE/WS-W 1CX1000SQMM GAON CABLE 2015 Procedure The examination of the conductor and measurement of insulation, oversheath and metal sheath thickness were carried out in accordance with Subclauses 10.4, 10.6 and At a sample of approximately 0,5 m the dimensions of the completed cable were measured. The conductor construction was checked by inspection and measurement. The test method was in accordance with Clause 8 of IEC The thickness of the semi-conducting screens on the conductor and over the insulation was not included in the thickness of the insulation. The thickness of the lead alloy sheath was measured by the ring method with a specified micrometer. Result The object passed the test.

65 KEMA Laboratories Tests for determining the mechanical properties of insulation before and after ageing Standard and date Standard IEC 62067, Subclause Test date 12 October 2015 Characteristic test data Temperature during ageing 135 ± 3 C Ageing duration 7 x 24 h (14 September to 21 September 2015) Item Unit Requirement Measured/determined Without ageing Tensile strength N/mm 2 12,5 27,5 Elongation at break % After ageing in air oven Tensile strength value after ageing N/mm 2-26,2 variation % ± 25 max. - 4,7 Elongation at break value after ageing % variation % ± 25 max. + 2,3 Procedure The sampling and preparation of the test pieces were carried out in accordance with Subclause 9.1 of IEC The ageing treatment was carried out in accordance with Subclause 8.1 of IEC under the conditions specified in Table 6. The conditioning and measurement of mechanical properties were carried out in accordance with Subclause 9.1 of IEC Result The object passed the test.

66 KEMA Laboratories Tests for determining the mechanical properties of oversheaths before and after ageing Standard and date Standard IEC 62067, Subclause Test date 12 and 13 October 2015 Characteristic test data Temperature during ageing 110 ± 2 C Ageing duration 10 x 24 h (14 September to 24 September 2015) Item Unit Requirement Measured/determined Without ageing Tensile strength N/mm 2 12,5 36,5 Elongation at break % After ageing in air oven Tensile strength value after ageing N/mm 2-25,1 variation % Elongation at break value after ageing % variation % - - 3,2 Procedure The sampling and preparation of the test pieces were carried out in accordance with Subclause 9.2 of IEC The ageing treatment was carried out in accordance with Subclause 8.1 of IEC under the conditions given in Table 7. The conditioning and measurement of mechanical properties were carried out in accordance with Subclause 9.2 of IEC Result The object passed the test.

67 KEMA Laboratories Ageing tests on pieces of complete cable to check compatibility of materials Standard and date Standard IEC 62067, Subclause Test date 12 and 13 October 2015 Characteristic test data Temperature during ageing 100 ± 2 C Ageing duration 7 x 24 h (14 September to 21 September 2015) Insulation Item Unit Requirement Measured/determined Without ageing Tensile strength N/mm 2 12,5 27,5 Elongation at break % After ageing in air oven Tensile strength value after ageing N/mm 2-26,7 variation % ± 25 max. - 2,9 Elongation at break value after ageing % variation % ± 25 max. + 2,6 Oversheath Item Unit Requirement Measured/determined Without ageing Tensile strength N/mm 2 12,5 36,5 Elongation at break % After ageing in air oven Tensile strength value after ageing N/mm 2-34,2 variation % - - 6,3 Elongation at break value after ageing % variation % - + 6,5 Procedure The samples for the tests on the insulation and the oversheath were taken from the complete cable as described in Subclause of IEC The test pieces of insulation and oversheath from the aged pieces of cable were prepared and subjected to mechanical tests as described in Subclause of IEC Result The object passed the test.

68 KEMA Laboratories Pressure test at high temperature on oversheath Standard and date Standard IEC 62067, Subclause Test date 15 September 2015 Characteristic test data Temperature 110 ± 2 C Heating time 6 hours Item Unit Requirement Measured/determined Depth of indentation % 50 0,9 Procedure The test was carried out as described in Subclause 8.2 of IEC , employing the test conditions given in the test method in Table 7. The loaded test pieces were heated for the following times: 4 h for test pieces with an outer diameter not exceeding 15 mm. 6 h for test pieces with an outer diameter exceeding 15 mm. Result The object passed the test.

69 KEMA Laboratories Hot set test for XLPE insulation Standard and date Standard IEC 62067, Subclause Test date 12 August 2015 Characteristic test data Air temperature 200 ± 3 C Time under load 15 min Mechanical stress 20 N/cm 2 Item Unit Requirement Measured/determined Elongation under load % Permanent elongation after cooling % 15 0 Procedure The hot set test was performed in accordance with Subclause The sampling and the test procedure were carried out in accordance with Clause 9 of IEC , employing the test conditions given in Table 8. The test pieces were taken from that part of the insulation where the degree of cross-linking is considered to be the lowest for the curing process employed. Result The object passed the test.

70 KEMA Laboratories Measurement of carbon black content of black PE oversheaths Standard and date Standard IEC 62067, Subclause Test date 15 September 2015 Item Unit Requirement Measured/determined Carbon black content % 2,5 ± 0,5 2,59 Procedure The carbon black content was measured using the sampling and test procedure described in Clause 11 of IEC Result The object passed the test.

71 KEMA Laboratories Water penetration test Standard and date Standard IEC 62067, Subclause Test date 16 September to 30 September 2015 Environmental conditions Ambient temperature C Characteristic test data Length of cable sample Water height Heating method 8 m 1 m above cable centre conductor current No. of heating cycles Required steady conductor temperature Heating cycle Heating Total duration Duration of conductor at steady temperature ( C) (h) (h) (h) Cooling Total duration Item Unit Requirement Measured/determined Water penetration under sheath side 1 cm Water penetration under sheath side 2 cm Water penetration in conductor side 1 cm Water penetration in conductor side 2 cm Procedure A sample of completed cable at least 8 m in length which had not been subjected to any of the tests described in Subclause 12.4, was subjected to the bending test described in Subclause The cable was placed horizontally. A ring approximately 50 mm wide was removed from the centre of the length. This ring comprised all the layers external to the conductor. The surfaces were cut so that the interfaces intended to be longitudinally watertight was readily exposed to water. A suitable device with a tube diameter of at least 10 mm was placed vertically over the exposed ring and sealed to the surface of the oversheath. The tube was filled within 5 min with tap water at a temperature between 10 C to 30 C, so that the height of water in the tube was 1 m above the cable centre. The sample stood for 24 h. Then 10 heating cycles were performed. The conductor was heated by a suitable method until it had reached a steady temperature 5 K to 10 K above the maximum conductor temperature in normal operation and it did not reach 100 C. The heating was applied for at least 8 h. The conductor temperature was maintained within the stated temperature limits for at least 2 h of each heating period. This was followed by at least 16 h of natural cooling. The water head was maintained at 1 m above the cable centre. Result The object passed the test.

72 KEMA Laboratories DRAWINGS

73 KEMA Laboratories

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75 KEMA Laboratories