MiCAFIL. 1 RIP Technology. Bushings. Z. Zic 09/2003

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1 MiCAFIL 1 RIP Technology Z. Zic 09/2003

2 )XQFWLRQRI+LJK9ROWDJH%XVKLQJ Uncontrolled (natural) electrical field Capacity-controlled electrical field

3 %XVKLQJV0DLQ,QVXODWLRQ6\VWHPV 7\SH 0DLQ,QVXODWLRQ +RXVLQJFRYHU 2LOH[SDQVLRQ FKDPEHU O I I P Oil Oil Impregnated Impregnated Paper Paper paper, paper, oil oil impregn. impregn. yes, yes, on on both both sides sides yes yes R B P Resin Resin Bonded Bonded Paper Paper paper, paper, resin resin bonded bonded no no no no R I I P Resin Resin Impregnated Impregnated Paper Paper paper, paper, resin resin impreg. impreg. no no no no 2LOJDXJH *DVWLJKW yes yes yes yes no no no, no, only only oil-tight oil-tight no no yes yes,(&pd[ 7DQGHOWD 3' < 0,007 0,007 < pc pc < 0,015 0,015 < pc pc < 0,007 0,007 < pc pc 2,/),//('%86+,1*6 '5<%86+,1*6

4 3URGXFWLRQRI5,3%XVKLQJV Conductor: - Al, Cu, - solid, tube Special creep paper Aluminium foils

5 3URGXFWLRQRI5,3%XVKLQJV 3 Under vacuum epoxy resin impregnation process 2 Drying process: - vacuum - heating 4 Curing process 1 Winding process

6 3URGXFWLRQRI5,3%XVKLQJV 5 Machining 6 Assembly 7 Routine Tests

7 5,3YV2,37HFKQRORJ\

8 5,37HFKQRORJ\LVWRGD\ VVWDWHRIWKHDUW SF6 - side of copper bar transformer side Simple Small Reliable Safe Environmentally friendly

9 Resin Impregnated Paper - R I P Bushings Main Advantages (1) HIGH TECHNICAL STANDARD - Low dielectric losses (tg delta < 0,35%) - PD free up to double service voltage - Excellent mechanical strength - High thermal strength (class E, 120 C) SUPERB IN DESIGN - No porcelain shell, except for outdoor use - Easy adaptable dimensions, customer-tailored bushings

10 Resin Impregnated Paper - R I P Bushings Main Advantages (2) STORAGE, INSTALLATION AND SERVICE: SIMPLE AND RELIABLE - Each position allowed (vertical to horizontal) - Dry, oil - free = simple in handling ENVIRONMENTALLY FRIENDLY - Pressure - free = explosion proof, fire resistant - No pollution by outflowing oil

11 RIP - Technology: summary of main advantages High technical level excellent mechanical strength low dielectric losses partial discharge free up to the double rated voltage high thermal strength (120 o C) Operation safe, service-friendly no damage risk on the bottom part no explosion risk with influence of the transformer gas tight heavy inflammable high operation safety also by damages of outer insulation no porcelain on transformer side Flexible in Design Adaptable on different transformer and plant constructions compact & robust no porcelain except for outdoor conditions silicon sheds possible any installation possible (vertical, horizontal) Environmental friendly oil free no explosion and fire risk through oil leakage no environmental risk through oil leakage maintenance friendly earthquake proof

12

13 NEW RIP Transformer Bushings GO WITH US AND GET THE MAYOR ADVANTAGE AGAINST YOUR COMPETITION!!

14 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 72.5 kv up to 550 kv. Since more than 40 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 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 ~ 0.35%) 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

15 Technical Data and Dimensions Dimension drawing 4xM12 25 deep D13 D14 80 Aluminium, silver plated Flange dimensions for: RTKG / 2000 RTKG / 2500 RTKG / 2000 RTKG / 2500 RTKG / 2000 RTKG / 2000 L L16 LF L2 s1 s2 20 L6 A B Grounded length D10 D9 D8 D1 D2 D5 Sealing area Ra =1.6 (N7) Test tap Sealing area Ra = 3.2 (N8) View A: SF6 side D12 D11 De-aeration of transformer opposite to test tap n11 x Øw 45 c Ø18 D Shields removable Types 123kV kv View B: Oil side D4 D3 Copper, thickness 30 mm d4 d5 d6 20 Types 362kV kv M12 (2 x180 ) n3xøv M12 (2 x180 ) Flange dimensions for: RTKG / 2500 RTKG / 2000 RTKG / 2500 RTKG / 2000 RTKG / 2000 RTKG / View A: SF6 side D12 D11 D12 D11 D12 D11 De-aeration of transformer opposite to test tap n11 x Øw n3xøv n11 x Øw n3 x Øv n11 x Øw n3 x Øv View B: Oil side D4 D3 D4 D3 D4 D3 M12 (2 x180 ) M12 (2 x180 ) M12 (2 x180 ) M12 (2 x180 ) M12 (2 x180 ) M12 (2 x180 ) prospectus No. D 4352 E 4

16 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 120% of the rated current of the transformer are considered to be able to withstand the overload conditions according to IEC Publication (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 / 2000 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 or IEEE C 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 20 For 170 kv / 2000 A respective 245 kv / 2000 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 / 2000 GARIP RTKG / 2500 GARIP RTKG / 2000 GARIP RTKG / 2500 GARIP RTKG / 2000 GARIP RTKG / 2000 GARIP RTKG / 2500 GARIP RTKG / 2000 GARIP RTKG / 2500 GARIP RTKG / 2000 GARIP RTKG / 2000 GARIP RTKG / 2000 Catalogue no. HLJM HLJM HLJM HLJM HLJM HLJM HLJM HLJM HLJM HLJM HLJM HLJM

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