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— GSA-OA RIP Transformer Bushing Technical Guide — TRANSFORMER COMPONENTS GSA-OA RIP Transformer bushing Technical guide — Original instruction The information provided in this document is intended to be general and does not cover all possible applications. Any specific application not covered should be referred directly to Hitachi ABB Power Grids, or its authorized representative. We reserve the right to make technical changes or modify the contents of this document without prior notice. With regard to purchase orders, the agreed particulars shall prevail. Hitachi ABB Power Grids does not accept any responsibility whatsoever for potential errors or possible lack of information in this document. We reserve all rights in this document and in the subject matter and illustrations contained therein. Any reproduction, disclosure to third parties or utilization of its contents – in whole or in parts – is forbidden without prior written consent of Hitachi ABB Power Grids. — Table of contents 04 Global leader in bushing solutions 05 Design 05 GSA Bushing in detail 06 General specifications 07 Technical data and dimensions 07 Electrical data 08 Dimensions 10 Conductor loading 10 Overloading of bushings 10 Conductor insulation 10 Short-time current 11 Connection details 12 Outer terminal 12 Outer shield 13 Inner terminal 14 Solid rod conductor 14 Design features 16 Separate screw terminal plate with bolts 16 End shield 16 Arcing horns 18 Testing 18 Standards 18 Routine testing 18 Type testing 18 Seismic qualification 18 Special tests 18 Test tap 18 Test tap adapter 19 Additional information 19 Clearance distance for transformer 20 Long term storage 21 Inquiry sheet 4 GSA-OA RIP TRANSFORMER BUSHING TECHNICAL GUIDE — Global leader in bushing solutions Hitachi ABB Power Grids has been a leading bushing supplier for more than 100 years including decades of experience with dry bushing technology and manufacturing. Superior technical Low risk, worldclass expertise and reliable partner consultancy Highest quality and Minimum lifecycle costs safety standards Full dry bushing Pre-sales and aftersales portfolio support Local presence with Highest customer global experience flexibility and fast delivery Environment friendly Simple storage and handling Offering customer support and service Reducing the complexity of your daily business throughout the complete customer journey • Highest quality and safety standards. • 100+ years of expertise in bushing design • Simplified and cost-effective customer and manufacturing. procurement through: • 40+ years of expertise in dry bushing. - Guided product selection. • Technical competence and know-how incl. - Easy access to all product relevant product training. information anytime. • Local presence to support every customer • Industrial leading delivery times provide worldwide (24/7 service, present in more than flexibility in the customer process. 26 countries). World class reliable partner you can trust Providing innovative solution • Comprehensive dry bushing portfolio. • Enabling monitoring of your bushing fleet • Exceeding standards with excellent thermal & over lifetime. electrical properties. • Environment friendly. • Enhanced safety and reliability: - Dry bushing technology with silicone insulator prevents explosion (oil & pressure-free). - Nonshattering silicone insulator protects personnel and reduces secondary damages to a minimum. • Minimum lifecycle costs. GSA-OA RIP TRANSFORMER BUSHING TECHNICAL GUIDE 5 — Design GSA Bushing in detail 1 GSA-OA is a Resin Impregnated Paper (RIP) bushing with Silicone Rubber (SiR) insulator. The condenser core is bonded directly to the silicone rubber to give a compact and lightweight bushing, containing no gas, oil or other liquids. The GSA bushings are produced by winding a crêped paper web onto a mandrel, with aluminum foil inserts for electrical stress control. The core is impregnated and cured under vacuum, giving a 2 partial discharge free bushing with low tan d (dissipation factor) <0.5 % far below global standard values. After curing, the core is 1. Outer terminal machined and the flange is fitted. High thermal 2. Silicone rubber insulator 3. Test tap endurance (class E, 120) 4. Mounting flange 5. RIP core with RIPCOAT The inner terminal is fixed to the top piece with a 6. Solid conductor divided ring (patented by Hitachi ABB Power Grids) and can be connected to leads by brazing. For maximum current rating, a solid copper rod is used. Outer terminals are available in a number of standard configurations in aluminum and copper, 3 but can also be modified to suit any connection need. 4 The flange and the top piece are protected from corrosion. The standard colour of the mounting flange and of the insulator is ANSI 70, light grey. Flange painting withstands corrosivity category 5 C5 (very high) of ISO-EN 12944-1 to -9. The moisture barrier "RIPCOAT" is standard for GSA-OA. Colour is Munsell nO.5 True Black 6 — 01 Transformer bushing type GSA-OA. 6 GSA-OA RIP TRANSFORMER BUSHING TECHNICAL GUIDE General specifications — Table 1. General specifications Type Data Application: Transformers Classification: Resin impregnated paper, capacitance graded, outdoor immersed bushing Ambient temperature: GSA 52–170: -55 °C to +40 °C. GSA 245: -40 °C to +40 °C. (Minimum value as per temperature class 3 of IEC 60137.) Altitude of site: < 1 000 m Level of rain and humidity: 1-2 mm rain/min horizontally and vertically, as per IEC 60060-1, and 5 mm/min as per IEEE. Pollution level: According to specified creepage distance and IEC 60815 Immersion medium: Transformer oil. Maximum daily mean oil temperature +90 °C. Maximum temporary oil temperature +115 °C. Oil level in transformer: Not lower than 25 mm from the bushing flange Max pressure of medium: 100 kPa (over pressure) Angle of mounting: Horizontal to vertical Test tap: Test tap with 4 mm male contact pin Capacitance C2 of test tap: < 5 000 pF Arcing horns: Optional equipment Conductor: Solid or flexible draw lead conductor Markings: Conforming to IEC/ IEEE and CE standard. For conditions exceeding the standard specification, please consult the supplier. GSA-OA RIP TRANSFORMER BUSHING TECHNICAL GUIDE 7 — Technical data and dimensions Electrical data — Table 2. Electrical data Ratings GSA-OA 52 73 100 123 145 170 245 Rated voltage IEC (kV) 52 72.5 100 123 145 170 245 Rated phase-to-ground voltage IEC (kV) 30 42 71 98 98 98 146 Insulation class IEEE (kV) 46 69 - 115 138 161 230 Rated line-to-ground voltage IEEE (kV) 29 44 - 88 88 102 146 Basic Insulation Level (kV) (Equal to dry lightning impulse withstand voltage.) 250 350 450 550 650 750 1050 Rated current (A) 2000 2000 1600 1600 1600 1600 1600 Draw lead current (A) 1250 1250 1250 1250 1250 1250 1250 Rated frequency (Hz) 50/60 50/60 50/60 50/60 50/60 50/60 50/60 Temporary over voltage (kV) 52 73 100 170 170 170 196 Wet power frequency AC (kV) 95 140 185 230 275 325 460 Dry power frequency. Routine test 1 minute (kV) 120 160 205 260 310 365 506 Dry switching (kV) N/A N/A N/A N/A N/A N/A 850 Wet switching N/A N/A N/A N/A N/A N/A 750 All bushing have a nameplate with the electrical data and information of that bushings specifics. See "02 Nameplate with marking example.". ABB Ludvika, Sweden GSA52-OA/2000/0.3 LF 130 052-BB No. Um 52 kV lr 2000 A 50/60 Hz BIL 250 kV SL - kV AC 120 kV M 16 kg L 445 mm 0-90° C1 pF Tan δ % C2 pF Tan δ % — 02 Nameplate with marking example. 8 GSA-OA RIP TRANSFORMER BUSHING TECHNICAL GUIDE Dimensions — Table 3. Dimensions Dimensions are subject to modification without notice. Cantilever load Max. permitted loading Creepage perpendicular Dimensions in mm distance to the terminal 1 Cenelec CLC/ Type TS 50458:2006 Total side Oil Air side Draw lead Top part distance Arcing height Flange Cond. core (outer) hole Center Min. gasket surface (inner) circle Hole Flange sheds Insulator piece Top Space for current transformer Net mass Number of holes thickness Flange minimum protected, at 90° Test Capacitance C GSA-OA Cat. No. denomination L L1 L2 L4 L5 L7 L8 D1 D2 D5 D6 D7 D8 D9 (mm) (kg) D10 n1 T (mm) (mm) (N) (N) (pF) 52 LF 130 052-BA 52/250/1250-E0 734 145 589 583 56 467 101 96 51 110 185 225 218 120 0 13 3) 6 15 1642 700 2000 1) 4000 1) 215 -BB 52/250/1250-E300 1034 445 300 16 417 -BC 52/250/1250-E500 1234 645 500 17 543 73 LF 130 073-BA - 1029 260 769 763 56 647 101 96 51 110 185 225 218 120 0 18 3) 6 15 2323 1000 2000 1) 4000 1) 325 -BB - 1329 560 300 20 512 -BC - 1529 760 500 21 636 -DA 72.5/325/1250-E0 964 195 185 0 16 303 -DB 72.5/325/1250-E300 1264 495 185 300 18 460 100 LF 130 100-BA - 1334 345 989 983 56 867 101 112 51 136 185 225 238 137 0 24 15 6 15 3150 2600 2000 1) 4000 1) 294 -BB - 1574 585 300 25 397 -BC - 1774 785 500 26 488 123 LF 130 123-BA - 1444 255 1189 1183 56 1067 101 136 51 150 250 290 258 160 0 45 15 8 15 3913 1700 2000 2) 4000 2) 216 -BB - 1744 555 300 50 319 -BC - 1944 755 500 53 369 -CA 123/550/1250-E0 1529 340 0 42 3919 200 -CB 123/550/1250-E300 1829 640 300 46 3919 260 -CC 123/550/1250-E500 2029 840 500 49 3919 356 145 LF 130 145-BA - 1731 362 1369 1363 56 1247 101 136 51 150 250 290 258 160 0 52 15 8 15 4595 2000 2000 2) 4000 2) 233 -BB - 2031 662 300 57 326 -BC - 2231 862 500 60 386 -CA 145/650/1250-E0 1739 370 290 0 48 12 254 -CB 145/650/1250-E300 2039 670 290 300 52 12 417 -CC 145/650/1250-E500 2231 862 290 500 55 12 400 170 LF 130 170-BA - 2019 410 1609 1603 56 1487 101 136 51 150 250 290 258 160 0 61 15 8 15 5504 2400 2000 2) 4000 2) 311 -BB - 2319 710 300 66 404 -BC - 2519 910 500 69 467 -CA 170/750/1250-E0 2039 430 290 0 56 12 312 -CB 170/750/1250-E300 2339 730 290 300 60 12 404 -CC 170/750/1250-E500 2559 950 290 500 64 12 467 245 LF130 245-BB 245/1050/1600-E300 3055 920 2135 2129 52 2005 105 177 60 200 400 450 339 220 300 180 23 12 20 9214 4396 2500 1) 5000 1) 459 -BD 245/1050/1600-E600 3355 1220 2135 2129 52 2005 105 177 60 200 400 450 339 220 600 191 23 12 20 9214 4396 2500 1) 5000 1) 536 1) Exceeding IEC 60137 Cantilever load Level II.
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