&RQWHQWV,QVWUXFWLRQVIRU(UHFWLRQ 2SHUDWLRQ 2XWGRRU7UDQVIRUPHU%XVKLQJ 57.)N9.6,7 6HULHV&25,3 +/$%( Document No. Edition : Date : Page : Amendments : A 29.11.02 1 of 14 *(1(5$/'(6,*1 3$&.,1* %XVKLQJ6XSSO\&RQGLWLRQV 7UDQVSRUW&DVH /LIWLQJRIWKH%XVKLQJ+DQGOLQJ 5HSDFNLQJIRU)XUWKHU7UDQVSRUW 6725$*( 3URFHHGLQJVDIWHU,QH[SHUW6WRUDJH,167$//$7,21$1'&200,66,21,1* 7HUPLQDO &OHDQLQJ'HDHUDWLRQDQG5HVWLQJ7LPH 0HDVXULQJWDS 6(59,&($1'0$,17(1$1&( 63$5(3$576$1'5(3$,5 6SDUH3DUWV 5HSDLU $33(1',; *HQHUDO'HVLJQ+/-0 +DQGOLQJRIWKH%XVKLQJ+/-0 7HUPLQDO+/- 0HDVXULQJ7DS+/$%( Micafil AG. All rights reserved for this document and the presented objects. Duplication, publication to thirds or utilisation beyond the agreed purpose without ÉÇÅÄÆÇÈ s written agreements is not permitted. Originated from: Replaced by: Amendments: Written by: O.Ilic Approved by: S.Gisy 200360 E komplett.doc
,QVWUXFWLRQVIRU(UHFWLRQ 2SHUDWLRQ +/$%( Edition A Page 2 of 14 *HQHUDO'HVLJQ See drawing HLJM 157834 The main insulation of the bushing consists of an insulating body made of resin impregnated paper with aluminium layers for capacitive grading. For installation on the transformer a main flange is fixed oil-tight on the insulating body. To protect the insulating body from environmental pollution, humidity or ultraviolet radiation, it is covered with composite insulator. In the head of the bushing a cable bolt is installed for the connection of the draw lead. A tightening cover with O-rings is installed between the cable bolt and the central tube of the bushing. For the measurement of the capacitance and the dissipation factor of the bushing, a self grounding test tap is installed in the main flange. 3DFNLQJ %XVKLQJ6XSSO\&RQGLWLRQV For protection against damages, the bushings are dispatched in wooden transport cases. The stem conductor is assembled in the bushing. The lower bushing end is protected against humidity by a plastic bag with a drying cartridge. 7UDQVSRUW&DVH Gross and net weight, as well as the dimensions are given in the dispatch notice. /LIWLQJRIWKH%XVKLQJ+DQGOLQJ (see drawing HLJM148404) 5HPRYLQJWKHEXVKLQJIURPWKHFDVH Small types can be taken out by hand, larger types need rope and lifting gear. %ULQJLQJWKHEXVKLQJLQWRYHUWLFDOSRVLWLRQ The easiest way is by means of two lifting gears and two ropes. One end of the rope is slung around sheds near the top, the other end is fixed with a hook in the lifting eye at the main flange. The bushing is lifted first with both lifting gears and the flange end lowered down afterwards. $WWHQWLRQ The bushing mustqrw be put down with the lower end to the floor because the shielding electrode might be damaged. The bushing should QRW be turned into vertical position with only one rope. The bushing can slip through and fall down. 5HSDFNLQJIRU)XUWKHU7UDQVSRUW It is necessary to ensure that the quality of packing, the protection against humidity and damages, is as good as on delivery. MICAFIL AG Badenerstrasse 780, CH-8048 Zürich, Postfach Telefax 01 / 435 64 44; Telefon 01 / 435 63 33
,QVWUXFWLRQVIRU(UHFWLRQ 2SHUDWLRQ +/$%( Edition A Page 3 of 14 6WRUDJH Concerning the storage of the bushing, the location (outdoors, rain protected or indoors) and the duration of storage (short, medium or long term) must be taken into account. If necessary a storage container can be ordered from Micafil AG. &DXWLRQ Generally the moisture protection of the bushing must be mounted all times. 6KRUWWHUP max.1 year 0HGLXPWHUP max. 2 years /RQJWHUP 1RWH 2XWGRRUSURWHFWHGIURPUDLQ In original transportation box, covered with plastic. Recommended: Additional moisture protection with a second plastic bag and desiccant cartridge. Not recommended Not recommended,qgrru In original transportation box or unpacked. In original transportation box or unpacked. - lower part of the bushing in a storage container, filled with oil or dry nitrogen. or: In original transportation box or unpacked. Only in dry rooms, temperature as constant as possible. The desiccant cartridge should be checked regularly. %XVKLQJVZKLFKKDYHEHHQVWRUHGLQVWRUDJHFRQWDLQHUVFDQEHXVHGHYHQDIWHUORQJ WHUPVWRUDJHZLWKRXWDQ\IXUWKHUWHVWLQJRIWKHEXVKLQJ MICAFIL AG Badenerstrasse 780, CH-8048 Zürich, Postfach Telefax 01 / 435 64 44; Telefon 01 / 435 63 33
,QVWUXFWLRQVIRU(UHFWLRQ 2SHUDWLRQ +/$%( Edition A Page 4 of 14 3URFHHGLQJVDIWHU,QH[SHUW6WRUDJH If it is suspicious whether the storage conditions are conform to the table afore, it is possible that humidity has entered into the insulation by a diffusion process. This must be confirmed by capacitance and power factor measurement at about 10 kv. If the deviation of the power factor is too big, please contact Micafil AG for further information about the drying procedure.,qvwdoodwlrqdqg&rpplvvlrqlqj 7HUPLQDO See drawing HLJ 579423. The cable bolt (5) can be taken out of the central tube after removing the cover nut (2) together with the tightening cap (4). For insertion of the cable bolt into the central tube from the transformer side of the bushing, the fixation ring (3) and the tightening cover (4) must be removed from the cable bolt. In order to withstand the transient voltages between conductor cable and central tube, the conductor cable should be covered with an insulation layer of about 1mm. An appropriate hole for soldering in the cable conductor, should first be drilled into the cable bolt (max. 35mm and max. hole depth 70mm). The connection can be done by soldering or brazing. According to the recommendations of the manufacturer of the pressing tool, crimping is also possible. After connecting the draw lead, the deaeration screw (1) has to be exchanged with a ring screw M12 (acc. DIN 444A or similar; max. 28mm) for pulling the cable bolt through the bushing by a rope. The tightening cover (4), the fixation ring and the cover nut must be placed on the rope before pulling the cable bolt through the central tube. Then the cable bolt with the draw lead is to be inserted into the bushing. Afterwards, the tightening cover with the O-rings is to be inserted between the cable bolt and the central tube, and the fixation ring is to be put into one of the grooves of the cable bolt. Now the cable bolt can be fixed with the cover nut (width between flats: 40 mm) with a torque of 50 Nm. After removing the ring screw, the deareation screw (1) must be reinstalled. $WWHQWLRQ,I WKH GHDHUDWLRQ VFUHZ LV QRW LQVWDOOHG SURSHUO\ ZDWHU FDQ HQWHU GLUHFWO\ LQWR WKH WUDQVIRUPHU &OHDQLQJ'HDHUDWLRQDQG5HVWLQJ7LPH The bushing must have environmental temperature before installation to avoid condensation on the bushing surface. The lower part of the bushing must be cleaned thoroughly with a clean, dry and non-fluffy fabric before installation. The transformer can be evacuated with mounted bushings. If the transformer is evacuated while it is being filled, the central tube must not be deaerated. MICAFIL AG Badenerstrasse 780, CH-8048 Zürich, Postfach Telefax 01 / 435 64 44; Telefon 01 / 435 63 33
,QVWUXFWLRQVIRU(UHFWLRQ 2SHUDWLRQ +/$%( Edition A Page 5 of 14 If the bushing is not evacuated, the central tube must be deaerated with the deareation screw at the top end of the conductor. $WWHQWLRQ $IWHUGHDHUDWLQJWKHFHQWUDOWXEHRIWKHEXVKLQJLWLVQHFHVVDU\WRFRQWURO LIWKHGHDHUDWLRQVFUHZLVIL[HGWLJKWO\ +LJKYROWDJH 8 Q 9VKRXOGEHDWWDFKHGWRWKHEXVKLQJHDUOLHVWKRXUV DIWHUILOOLQJWKHWUDQVIRUPHUZLWKRLO 0HDVXULQJWDS See instruction HLAB200203E. $WWHQWLRQ )RUFRQQHFWLRQRQO\XVHWKHSOXJDFFRUGLQJWR+/-0ILJ RU DQ DGDSWHUSOXJDFFRUGLQJWRILJ1HYHUIRUFHWKHJURXQGLQJVSULQJZLWKD WRRO,QVHUYLFHWKHFRYHURIWKHPHDVXULQJWDSPXVWEHLQVWDOOHG MICAFIL AG Badenerstrasse 780, CH-8048 Zürich, Postfach Telefax 01 / 435 64 44; Telefon 01 / 435 63 33
,QVWUXFWLRQVIRU(UHFWLRQ 2SHUDWLRQ +/$%( Edition A Page 6 of 14 6HUYLFHDQG0DLQWHQDQFH Before putting the bushing into service, carry out a measurement of dissipation factor tan δ and capacity C 1 between high voltage lead and test tap at a voltage up to 10 kv in order to have a reference for later checks. The bushings do not need any maintenance. 6SDUH3DUWVDQG5HSDLU 6SDUH3DUWV When ordering spare parts always indicate the serial number and the type of bushing. 5HSDLU Repair only according to Micafil AG instructions. For this, give the serial number and the type of bushing and an exact description of the damage. $SSHQGL[ *HQHUDO'HVLJQ +/-0 +DQGOLQJRIWKH%XVKLQJ +/-0 7HUPLQDO +/- 0HDVXULQJ7DS +/$%( MICAFIL AG Badenerstrasse 780, CH-8048 Zürich, Postfach Telefax 01 / 435 64 44; Telefon 01 / 435 63 33
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 50000 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
Technical Data and Dimensions Dimension drawing 4xM12 25 deep D13 D14 80 Aluminium, silver plated Flange dimensions for: RTKG 72.5-350 / 2000 RTKG 72.5-350 / 2500 RTKG 123-550 / 2000 RTKG 123-550 / 2500 RTKG 145-650 / 2000 RTKG 170-750 / 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 22.5 22.5 45 n11 x Øw 45 c6 20 115 Ø18 D7 40 85 Shields removable Types 123kV - 245 kv View B: Oil side D4 D3 Copper, thickness 30 mm d4 d5 d6 20 Types 362kV - 525 kv n3xøv Flange dimensions for: RTKG 170-750 / 2500 RTKG 245-1050 / 2000 RTKG 245-1050 / 2500 RTKG 362-1300 / 2000 RTKG 420-1550 / 2000 RTKG 525-1800 / 2000 22.5 11.5 22.5 11.5 22.5 45 View A: SF6 side D12 D11 D12 D11 D12 D11 De-aeration of transformer opposite to test tap 15 30 n11 x Øw n3xøv 15 30 n11 x Øw n3 x Øv 11.5 22.5 n11 x Øw n3 x Øv View B: Oil side D4 D3 D4 D3 D4 D3 prospectus No. D 4352 E 4
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 60354 (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 123 145 170 245 362 420 525 AC test voltage (kv) 185 230 275 310 325 365 460 570 630 680 750 790 A (mm) 130 145 170 200 210 230 300 400 450 500 550 600 Type designation The type designation is included in an overall system. An example of nomenclature used to designate our GARIP bushings: GARIP RTKG 245-1050 / 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 60137 or IEEE C57.19.00. 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 72.5-350 / 2000 GARIP RTKG 72.5-350 / 2500 GARIP RTKG 123-550 / 2000 GARIP RTKG 123-550 / 2500 GARIP RTKG 145-650 / 2000 GARIP RTKG 170-750 / 2000 GARIP RTKG 170-750 / 2500 GARIP RTKG 245-1050 / 2000 GARIP RTKG 245-1050 / 2500 GARIP RTKG 362-1300 / 2000 GARIP RTKG 420-1550 / 2000 GARIP RTKG 525-1800 / 2000 Catalogue no. HLJM 154484 HLJM 154964 HLJM 154504 HLJM 154514 HLJM 154524 HLJM 154534 HLJM 154544 HLJM 154554 HLJM 154564 HLJM 154574 HLJM 154584 HLJM 154594 6