Transformer Bushings for GIS Oil to SF6 Connections GARIP RTKG 725-55 kv SQS certified ISO 91 / ISO 141 Bushings
RIP - Technology for SF6 / Oil - Bushings In modern metal enclosed switchgear SF6 -gas is used as an extinguishing and insulating medium, ensuring highest security standard for operating staff and residents, especially in most confined and dense populated areas As a result, today s space saving design requires excellent mechanical and electrical performance of all components involved Micafil s contribution to this world-wide development is it s new product range of GARIP bushings These have been designed for the direct single phase connection between power transformers and gas insulated switchgear (GIS) for rated voltages of 725 kv up to 55 kv Since more than 4 years Micafil AG produces high voltage bushings made with Vacuum Resin Impregnated Paper Technology (RIP) We are proud of our leading position in this field, making available to our customers profound expertise in the latest state of the art technology, which is based upon more than 5 RIP - bushings successful in operation The insulation body of the GARIP condenser bushing series consists of a robust and solid core, made of wound crepe paper and inserted aluminium foils for field control, carefully vacuum dried and subsequently impregnated with special epoxy resin The basic procedure for this new kind of manufacture was originally developed by Micafil AG in Switzerland already in 1958 and continuously improved in the course of four decades Advanced standardisation, highly skilled craftsmanship and computer-aided engineering guarantee today s most reliable and advanced insulation system for every voltage level Main advantages of Micafil s RIP- technology Short delivery times Low dielectric losses (tan δ ~ 35%) Partial discharge free up to double service voltage Fully dry, maintenance free Oil-free and environmental friendly Highest mechanical and thermal properties Robust design and vandalism resistant Option for any operating position Gas and oil tight Easy handling 2
Design and Accessories Manufacturing of the main RIP - insulating body includes the solid and non-removable conductor, resulting in a perfect reliable structure, matching today s stringent electrical, thermal and mechanical requirements Main features of the SF6 interface Dimensions and physical properties of GARIP type bushings fully comply with all standard aspects according to IEC publication 61639 This enables complete compatibility of the interface for both, producers of transformers and GIS manufacturers The specifically shaped head both acts as silver-coated terminal with tapped holes as well as epoxy- coated high voltage electrode Therefore additional shields are not necessary Only adjacent conductor parts should be well adapted to the bushing terminal Intended for the whole range of rated voltages from 725 to 55 kv, Micafil s GARIP bushings are specified up to 75 kpa working pressure SF6 in the GIS Our new series of GARIP bushings require minimum functional SF6 -gas pressures of 35 kpa (725-42 kv) and 39 kpa (525 kv) respectively Flange design All flanges are made of corrosion proof aluminium alloys Standard equipment encompasses a test tap, four threads at the transformer side flange plate either for grounding or as forcing threads and a de - aeration on the transformer side A set of most advanced seals between the main insulating RIP - body and the flange systems guarantees permanent gas and oil tightness during operation Test tap All GARIP bushings include a self - grounded test tap connecting the outer control layer of the RIP - body for capacitance and tang measurement on site Main features of the transformer interface The scope of new GARIP bushings offers CT spaces of,, and mm as a standard equipment (note: L6min = 1 mm for 17 kv types) Special shields, which are dismountable for better handling, are supplied for all bushings with rated voltage greater than 725 kv Customised design for every Oil / SF6 application is available on request 3
Technical Data and Dimensions Dimension drawing 4xM12 25 deep D13 D14 8 Aluminium, silver plated Flange dimensions for: RTKG 725-35 / 2 RTKG 725-35 / 25 RTKG 123-55 / 2 RTKG 123-55 / 25 RTKG 145-65 / 2 RTKG 17-75 / 2 L L16 LF L2 s1 s2 2 L6 A B Grounded length D1 D9 D8 D1 D2 D5 Sealing area Ra =16 (N7) Test tap Sealing area Ra = 32 (N8) View A: De-aeration of transformer opposite to test tap 45 45 c6 2 115 Ø18 D7 4 85 Shields removable Types 123kV - 245 kv View B: Oil side Copper, thickness 3 mm d4 d5 d6 2 Types 362kV - 525 kv M12 (2 x18 ) n3xøv M12 (2 x18 ) Flange dimensions for: RTKG 17-75 / 25 RTKG 245-15 / 2 RTKG 245-15 / 25 RTKG 362-1 / 2 RTKG 42-155 / 2 RTKG 525-18 / 2 115 115 45 View A: De-aeration of transformer opposite to test tap 15 3 n3xøv 15 3 n3 x Øv 115 n3 x Øv View B: Oil side M12 (2 x18 ) M12 (2 x18 ) M12 (2 x18 ) M12 (2 x18 ) M12 (2 x18 ) M12 (2 x18 ) prospectus No D 4352 E 4
Technical Data and Dimensions 1 2 3 4 5 6 7 8 9 1 11 12 13 14 15 16 17 18 19 2 21 22 23 24 25 26 27 28 29 3 31 32 33 34 35 36 37 38 39 4 41 42 43 44 Dielectric data Dimensions of the bushing Adjacent GIS Core, oil side Mechanical design Conductor loading Terminal Core, Flange, Flange, oil side Oil side terminal and shield Type Flange IEC 6137 IEEE C57191-2 SF6: Min operating pressure at 2 C Cantilever test load, 1 Min Max operating bending moment on the flange Weight Max operating current Rated thermal short time current, 2s SIL 25/25µs BIL 1,2/5 µs AC test voltage Rated max lineto-ground voltage System voltage SIL 25/25µs BIL 1,2/5 µs AC test voltage Ur / 3 Rated voltage Ur Condenser bushing, oil to SF6, for transformers DGIS min L L6 L16 D1 D7 c6 d4 d5 d6 LF s1 s2 D2 D5 n3 x Øv D9 D1 L2 D8 D13 D14 (abs) mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm n x mm mm mm mm mm n x mm mm mm mm mm kv kv kv kv kv kv kv kv kv kv A ka kg kn knm kpa GARIP RTKG 13 9-52 - - 15 2 2 165 25 29 22 8 x Ø16 2 26 285 315 8 x Ø16 33 13 99 7 175 475 775 77 17 137 4 5 35 25 37 48 58 6 24 22 2 RTKG 725-35/2 725 42 14 325-69 44 16 35-13 11-52 - - 15 2 2 165 25 29 22 8 x Ø16 2 26 285 315 8 x Ø16 33 13 99 7 175 475 775 77 17 137 4 5 35 25 45 6 75 75 27 245 RTKG 725-35/25 725 42 14 325-69 44 16 35-13 9 22 52 17 16 15 2 2 165 25 29 22 8 x Ø16 22 28 35 335 8 x Ø16 52 13 99 7 31 61 91 118 148 178 4 1 35 49 59 69 55 22 24 19 RTKG 123-55/2 123 71 23 55-92 73 185 45-13 11 22 52 14 18 15 2 2 165 25 29 22 8 x Ø16 22 28 35 335 8 x Ø16 52 13 99 7 31 61 91 118 148 178 4 1 35 65 8 95 71 285 265 25 RTKG 123-55/25 123 71 23 55-92 73 185 45-13 9 22 52 17 16 15 2 2 165 25 29 22 8 x Ø16 22 28 35 335 8 x Ø16 52 13 99 7 36 66 96 123 1 183 4 1 35 51 61 71 21 2 19 RTKG 145-65/2 145 84 275 65-138 88 31 65-15 2 2 165 25 29 22 8 x Ø16 22 28 35 335 8 x Ø16 52 13 99 7 13 9 22 Var1:17/16 52 Var2:14/18 52 72 12 1 139 159 189 4 1 35 55 62 72 21 2 19 RTKG 17-75/2 17 98 325 75-161 12 365 75-152 11 22 52 14 18 15 2 2 19 29 335 26 12 x Ø16 22 28 35 335 8 x Ø16 52 152 99 7 52 72 12 1 139 159 189 4 1 35 75 85 1 65 2 25 24 RTKG 17-75/25 17 98 325 75-161 12 365 75-18 25 25 21 29 335 26 12 x Ø16 45 51 5 565 16 x Ø16 77 172 139 11 172 9 22 Var1:17/16 52 Var2:14/18 59 89 119 174 24 234 4 2 35 45 95 11 123 5 2 19 175 RTKG 245-15/2 245 141 46 15 85 23 146 425 9-2 11 22 52 14 18 18 25 25 24 4 45 37 12 x Ø16 45 51 5 565 16 x Ø16 77 2 139 11 59 89 119 174 24 234 4 2 35 45 132 154 173 65 2 25 24 RTKG 245-15/25 245 141 46 15 85 23 146 425 9-282 14 25 52 176 292 18 3 3 34 62 68 58 16 x Ø2 54 64 69 16 x Ø2 15 282 139 11 65 95 125 211 241 271 4 4 35 54 23 26 29 21 2 19 RTKG 362-1/2 362 29 57 1 15 345 22 52 1175 825 282 14 25 52 176 292 18 3 3 34 62 68 58 16 x Ø2 54 64 69 16 x Ø2 15 282 139 11 72 12 132 218 248 278 4 4 35 54 24 27 21 2 19 RTKG 42-155/2 42 242 68 155 1175 - - - - - 342 15 25 52 176 292 18 3 3 4 62 68 58 16 x Ø2 54 64 69 16 x Ø2 15 342 139 11 85 115 145 231 261 291 4 4 39 54 335 375 5 2 19 18 RTKG 525-18/2 525 33 79 18 1 5 318 75 1675 1175 explanations of the columns: 25 The copper terminal is flat with two holes Ø18mm 12 Conductor loading according to IEC 6137 & IEEE C5719 (max daily means: oil 95 C, SF6 -gas 75 C) 5 Lightning impulse withstand voltage according to IEC 6137 26 Bushings Ur > 725kV are equipped with an oil end shield The shield is epoxy coated 6 Switching impulse withstand voltage according to IEC 6137 13 Short time current after operation with rated current 27 For better handling the shield is dismountable Note: For the 17kV / 2A and 245kV / 2A types, two different shield sizes are available depending on the transformer current 2 CT spaces L6 as standard, other lengths on request Note: L6min =1mm for 17kV types 1 Lightning impulse withstand voltage according to IEEE C57191 11 Switching impulse withstand voltage according to IEEE C57191 prospectus No D 4352 E 5
General Informations Conductor loading Rated current dependent on the bushing lower length (see "Technical Data" page 5 & 6, column 12) Bushings selected with Ir not less than 12% of the rated current of the transformer are considered to be able to withstand the overload conditions according to IEC Publication 6354 (Loading guide) Recommendations for bushing installation Transformer The field strength in the oil on the surface of the shield insulation must be limited to values normal for insulated components As a guideline minimum distances A to grounded transformer parts are given below: Type RTKG 123 145 17 245 362 42 525 AC test voltage (kv) 185 23 275 31 325 365 46 57 63 68 75 79 A (mm) 13 145 17 2 21 23 4 45 5 55 Type designation The type designation is included in an overall system An example of nomenclature used to designate our GARIP bushings: GARIP RTKG 245-15 / 2 Testing of the bushing Nominal current (A) Lightning impulse voltage (kv) Rated voltage (kv) R=RIP Insulation T=Transformer application K=Short oil side part G= SF6 -gas application Bushing series Each bushing undergoes routine testing before leaving the factory, either according to IEC 6137 or IEEE C5719 The standard tests include: Tan δ, capacitance and partial discharge measurement Power frequency test Lightning impulse test (if applicable) Leakage test Ordering particulars When ordering please state: Type and catalogue no see the table below CT space L6, see "Technical Data" page 5 & 6, column 2 For 17 kv / 2 A respective 245 kv / 2 A only: choose the size of oil side shield depending on the transformer current; see "Technical Data" page 5 & 6, columns 26 &27 GIS A Observe the minimum enclosure diameter DGIS as well as the minimum operating SF6-gas pressure (see "Technical Data" page 5 & 6, columns 17 & 18) Adjacent conductor parts should be well adapted to the bushing terminal General Because the bushing is completely dry it can be operated vertically or horizontally or in any position Bushing type GARIP RTKG 725-35 / 2 GARIP RTKG 725-35 / 25 GARIP RTKG 123-55 / 2 GARIP RTKG 123-55 / 25 GARIP RTKG 145-65 / 2 GARIP RTKG 17-75 / 2 GARIP RTKG 17-75 / 25 GARIP RTKG 245-15 / 2 GARIP RTKG 245-15 / 25 GARIP RTKG 362-1 / 2 GARIP RTKG 42-155 / 2 GARIP RTKG 525-18 / 2 Catalogue no HLJM 154484 HLJM 154964 HLJM 15454 HLJM 154514 HLJM 154524 HLJM 1544 HLJM 154544 HLJM 154554 HLJM 154564 HLJM 154574 HLJM 154584 HLJM 154594 6
Continuity over the last 75 Years GARIP23en/SO Prospectus no D 4352 E Printed in Switzerland Alternations reserved - Photography & layout by RGB Photo GmbH, Zurich Micafil AG Badenerstrasse 78 CH- 848 Zurich Switzerland Phone +41 ()58 586 3 33 Fax +41 ()58 586 4 44 E-mail info@micafilch Web wwwmicafilch