Transformer Bushings for GIS

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1 Transformer Bushings for GIS Oil to SF6 Connections GARIP RTKG kv SQS certified ISO 91 / ISO 141 Bushings

2 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

3 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 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 ( 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

4 Technical Data and Dimensions Dimension drawing 4xM12 25 deep D13 D14 8 Aluminium, silver plated Flange dimensions for: RTKG / 2 RTKG / 25 RTKG / 2 RTKG / 25 RTKG / 2 RTKG / 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 c Ø18 D Shields removable Types 123kV kv View B: Oil side Copper, thickness 3 mm d4 d5 d6 2 Types 362kV kv M12 (2 x18 ) n3xøv M12 (2 x18 ) Flange dimensions for: RTKG / 25 RTKG / 2 RTKG / 25 RTKG / 2 RTKG / 2 RTKG / 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

5 Technical Data and Dimensions 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 C 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 x Ø x Ø RTKG / x Ø x Ø RTKG / x Ø x Ø RTKG / x Ø x Ø RTKG / x Ø x Ø RTKG / x Ø x Ø Var1:17/16 52 Var2:14/ RTKG 17-75/ x Ø x Ø RTKG 17-75/ x Ø x Ø Var1:17/16 52 Var2:14/ RTKG / x Ø x Ø RTKG / x Ø x Ø RTKG 362-1/ x Ø x Ø RTKG / x Ø x Ø RTKG / 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 Bushings Ur > 725kV are equipped with an oil end shield The shield is epoxy coated 6 Switching impulse withstand voltage according to IEC 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 C Switching impulse withstand voltage according to IEEE C57191 prospectus No D 4352 E 5

6 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 AC test voltage (kv) A (mm) Type designation The type designation is included in an overall system An example of nomenclature used to designate our GARIP bushings: GARIP RTKG / 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 / 2 GARIP RTKG / 25 GARIP RTKG / 2 GARIP RTKG / 25 GARIP RTKG / 2 GARIP RTKG / 2 GARIP RTKG / 25 GARIP RTKG / 2 GARIP RTKG / 25 GARIP RTKG / 2 GARIP RTKG / 2 GARIP RTKG / 2 Catalogue no HLJM HLJM HLJM HLJM HLJM HLJM 1544 HLJM HLJM HLJM HLJM HLJM HLJM

7 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 () Fax +41 () Web wwwmicafilch

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