— 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. 2) Conforming to IEC 60137 Cantilever load Level II. 3) According to figure 2.

Shed profileShed GSA profile 52–170 GSA 52–170 Shed profileShed GSA profile 245 GSA 245

55 mm 55 mm 65 mm 65 mm

R8 (2x) R8 (2x) R10 (2x) R8 (2x)R10 (2x) R8 (2x)

15° (2x) 15° (2x) 15° (2x) 15° (2x) 55 mm 55 mm 55 mm 55 mm 24.1 mm 24.1 mm 21.5 mm 21.5 mm

8° (2x) 8° (2x) 8° (2x) 8° (2x) R2.3 (2x) R2.3R5 (2x) (2x) R5 (2x) R2.3 (2x) R2.3 (2x)R5 (2x) R5 (2x) 38 mm 38 mm 48 mm 48 mm

D6 D6 17.5 mm 17.5 mm D10 x n1 D10 x n1

T T 15 mm 15 mm D5 D5 2 mm 2 mm M12 M12 for earthingfor earthing 90° 90° (D6) (D6) D6 D6 Hole designHole for design for Hole designHole for design for D7 D7 GSA 52-73GSA 52-73 GSA 100-245GSA 100-245 GSA-OA RIP TRANSFORMER BUSHING TECHNICAL GUIDE 9

Dimensions D8 — D9 Table 3. Dimensions Dimensions are subject to modification without notice. Cantilever load Max. permitted L5 loading To inner terminal 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) L L2 L7 L4 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 L8 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 Shed ShedprofileShed profile GSAprofile 52–170GSA GSA 52–170 52–170 Shed ShedprofileShed profile GSAprofile 245GSA GSA 245 245 -BC - 2231 862 500 60 386 55 mm 65 mm -CA 145/650/1250-E0 1739 370 290 5555 mm mm0 48 12 6565 mm mm254

R8 (2x) R10 (2x) R8 R10(2x) (2x)R8R8 (2x) (2x) -CB 145/650/1250-E300 2039 670 290 R8R8 (2x) (2x) 300 52 12 R10R10 (2x)(2x) 417 -CC 145/650/1250-E500 2231 862 290 500 55 12 400 D1 15° (2x) 170 LF 130 170-BA - 2019 410 1609 1603 56 1487 101 136 51 150 250 290 258 160 0 61 15°15 (2x)15°15° (2x)8 (2x) 15 5504 2400 2000 2) 4000 2) 311 15°15° (2x) (2x)

-BB - 2319 710 300 66 404 L1 55 mm 55 mm 55 mm 55 mm 55 mm 55 mm 55 mm -BC - 2519 910 500 69 55 mm 467 GSA 245 with

24.1 mm D2 24.1 mm 24.1 mm 24.1 mm 21.5 mm 21.5 mm 21.5 mm 21.5 mm end shield -CA 170/750/1250-E0 2039 430 290 0 56 12 312 -CB 170/750/1250-E300 2339 730 290 300 60 12 404 8° (2x)8°8° (2x) (2x) 8° (2x)8°8° (2x) (2x) -CC 170/750/1250-E500 2559 950 290 R5 (2x) 500 64 12 R5 (2x) 467 R2.3 (2x)R2.3R2.3 (2x) (2x) R5 R5(2x) (2x) R2.3 (2x)R2.3R2.3 (2x) (2x) R5 R5(2x) (2x) 245 LF130 245-BB 245/1050/1600-E300 3055 920 2135 2129 52 2005 105 177 60 200 400 450 339 220 38 mm3830038 mm mm180 23 12 20 9214 4396 2500 1) 500048 mm 1) 4848 459mm mm -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. 214 mm 2) Conforming to IEC 60137 Cantilever load Level II. 3) According to figure 2. — 225 mm 03 Dimensions.

D6 D6D6 17.5 mm17.517.5 mm mm D10 xD10 n1D10 x n1x n1 15 mm 15 mm 15 mm T T T 15 mm M12 D5 D5D5 2 mm2 mm2 mm M12M12 for earthingforforfor earthingearthing earthing 90° 90°90° (D6) (D6)(D6)(D6) D6 D6D6 Hole designHoleHole design fordesign for for Hole designHoleHole design fordesign for for D7 D7D7 GSA 52-73GSAGSA 52-73 52-73 GSA 100-245GSAGSA 100-245 100-245 10 GSA-OA RIP TRANSFORMER BUSHING TECHNICAL GUIDE

— Conductor loading

The GSA bushings fulfil the temperature rise test Overloading of bushings requirements according to IEC and IEEE for the If the conductor for the bushing is selected with currents in Table 4. 120 % of the rated current of the transformer, the bushing is considered to be able to withstand the — overload conditions stated in IEC 60076-7 Table 4. Conductors tested without further clarifications or tests, according Permissible current to IEC 60137. Type GSA-OA Conductor IEC (A) IEEE (A) 52-73 kV Solid rod 2000 2000 Conductor insulation 100-245 kV Solid rod 1600 1600 Draw leads and solid rods must be insulated with All types Stranded cable vacuum oil-impregnated insulating paper or 2 185 mm 400 400 equivalent, to give sufficient insulation integrity. 2 740 mm 1250 1250 The paper insulation must be min. 2 mm.

Calculation of values for the maximal permissible Draw lead: The paper insulation must be brought current at 20 °C in a stranded cable, see Table 5. min. 50 mm inside the bushing centre hole.

— Solid rod: The paper must fill the recess and cover Table 5. Calculated permissible current the whole solid rod end downwards. Stranded Permissible Type GSA-OA cable (mm2) current (A) Short-time current All types 90 200 The rated thermal short-time current (I ) is 150 310 th calculated according to IEC 60137. See Table 6. 240 480 300 570 400 700 500 820 630 1000

— Table 6. Short-time current Short-time current

(Ith) kA, rms Rated Area Dynamic current (Id) Type GSA-OA Conductor current (A) (mm2) 1 s 2 s kA, peak 52-170 kV Solid rod Ø 49 mm Cu 2000-1600 1886 100 96 240 52, 73, 245 kV Solid rod Ø 58 mm Cu 1600 2642 100 100 315 245 kV Solid rod Ø 58 mm Al 1600 2642 100 90 225 All types Stranded draw-lead 1250 740 61 43 107 GSA-OA RIP TRANSFORMER BUSHING TECHNICAL GUIDE 11

— Connection details

The bushing can be configured with one of two terminal systems: the draw lead system for greater ease of assembly, when the required current capacity is lower, or the solid rod conductor system for maximum current capacity.

As an option the outer terminal can be equiped with a terminal plate for connection to the line conductor and the bushing can also be equipted with arcing horns for protection during flashover.

Outer terminal Outer terminal Outer terminal

Inner terminal

Solid rod conductor, upper part

Screw joint

Draw lead Solid rod conductor, Solid rod conductor lower part

For brazing For screw terminal (no end shield needed) (end shield needed) — 04 Bushings with draw lead, solid rod conductor with screw joint and without. 12 GSA-OA RIP TRANSFORMER BUSHING TECHNICAL GUIDE

Outer terminal The outer terminal needs to be specified in each case. The outer terminal is then used together with D either a solid rod, for maximum current capacity, or a draw lead for greater ease of assembly, when the required current capacity is lower. Terminal stud 125 The outer terminal is available in a number of standard configurations. Other configurations can be supplied on request. O-ring

— Table 7. GSA 52-170 Outer terminal Cat. No. Max. Mass Material Plating D (mm) LF 170 079 current (A) (kg) Aluminum - 60 -A 2000 2 - 30 -B 1250 2 Copper - 60 -C 2000 6 - 30 -D 1600 4 Tightening ring Divided ring Tin 60 -E 2000 6 Tin 30 -F 1600 4 Silver 60 -G 2000 6 — 05 Outer terminal GSA-OA 52-170. Silver 30 -H 1600 4

— Table 8. GSA 245 Outer terminal Cat. No. Max. Mass Material Plating D (mm) LF 170 079 current (A) (kg) D Aluminum - 60 -BA 1600 3 - 30 -BB 1250 2 Copper - 60 -BC 1600 8 Terminal stud - 30 -BD 1600 5 125

Outer shield Outer shield If extra shielding of the connected power line is O-ring required, an outer shield can be supplied on request for the GSA 245.

— Table 9. GSA 245 Outer shield Mass Material D (mm) Cat. No. (kg) Aluminum 310 1ZSC028970-AAA 1 Tightening ring Divided ring

— 06 Outer terminal GSA 245 GSA-OA RIP TRANSFORMER BUSHING TECHNICAL GUIDE 13

Inner terminal The inner terminal is made of copper for the brazing of a draw lead.

— Table 10. GSA 52-170 Inner terminal Conductor Cat. No. Mass Material diameter (mm) LF 170 080 (kg) Copper 5 (pilot hole) -A 1 11 -B 1 13 -C 1 Inner terminal 15 -D 1 18 -E 1 30 -F 1 42 -G 1 45 -H 1

— Table 11. GSA 245 Inner terminal Conductor Cat. No. Mass L4 Material diameter (mm) LF 170 080 (kg) Copper 5 (pilot hole) -BA 1 Draw lead 30 -BB 1 45 -BC 1

M8

13

L4 35

Conductor diameter

To flange

Ø 49/58(GSA 245)

— — 07 Inner terminal. 08 Bushings with draw lead. 14 GSA-OA RIP TRANSFORMER BUSHING TECHNICAL GUIDE

Solid rod conductor There are three alternative designs for solid rod conductors. Available are two alternatives with a dividing point and the third option with a solid rod conductor without a dividing point. Depending on preference the dividing point is either 20 mm below the bushing flange or 20 mm below the current transformer.

Design features Solid rod conductor, • The rod is produced from electrolytic copper upper part or aluminum. • The divided point is joined with a screw joint with undroppable screws. • The lower part of the solid rod conductor is designed for connection by brazing. Solid rod conductor The GSA 245 is available with a terminal for brazing or screw terminal. The solid rod with screw terminal is also available in aluminum without a dividing point. If a solid rod conductor with a screw terminal will be used an end shield is required.

Dividing point (bushing flange) Screw joint (bushing flange)

Screw joint (current transformer)

Solid rod conductor, lower part — 09 Dividing point at bushing flange.

For screw terminal For brazing (end shield needed) (no end shield needed) — 10 Bushings with solid rod conductors. GSA-OA RIP TRANSFORMER BUSHING TECHNICAL GUIDE 15

D1 — D2 Table 12. Ordering particulars for solid rod conductor for GSA 52–170 Division at flange Division at current transformer Mass (kg) 1600 A 2000 A 1600 A 2000 A Bushing Upper part Lower part Lower part Upper part Lower part Lower part Cat. No. LF 170 081 LF 170 082 LF 170 082 LF 170 081 LF 170 082 LF 170 082 1600 A 2000 A LF 130 052 -BA -ABA -DABA -ABA - - - 13 13.5

47 35 Insulate -BB -BABA -DABB -ABB -ABB -DBABA -BABA 18 18.5 up to here -BC -CABA -DABC -ABC -ABC -DCABA -CABA 21.5 22 Ø 43 LF 130 073 -BA -BBA -DBBA -BBA - - - 18 18.5 GSA 52-170 Ø 49 -BB -BBBA -DBBB -BBB -BBB -DBBBA -BBBA 23 23.5 -BC -CBBA -DBBC -BBC -BBC -DCBBA -CBBA 26 26.5

D1 -DA -BBA - -BDA - - - - 18 D2 -DB -BBBA - -BDC - - - - 23 LF 130 100 -BA -HAA -EAA - - - - 23 - -BB -HAA -EAB - - - - 27 - -BC -HAA -EAC - - - - 31 - LF 130 123 -BA -DBA -DADBA - - - - 25 - -BB -BDBA -DDBB - -DBB -DBDBA - 30 - 60 Insulate 35 up to here -BC -CDBA -DDBC - -DBC -DDBA - 33 - -CA -DBA -DEBA - - - - 27 - Ø 56 -CB -DBA -DABC - - - - 32 - GSA 52-73 Ø 62 -CC -DBA -DEBC - - - - 36 - LF 130 145 -BA -EBA -DEBA - - - - 29.5 - D1 D2 -BB -BEBA -DEBB - -EBB -DBEBA - 33.7 - -BC -CEBA -DEBC - -EBC -DCEBA - 37.1 - -CA -EBA -ECA - - - - 30 - -CB -BEBA -DEBB - - - - 35 - -CC -CEBA -DEBC - -EBC -DCEBA - 39 - LF 130 170 -BA -FBA -DAFBA - - - - 34.5 - 47 35 Insulate -BB -BFBA -DFBB - -FBB -DBFBA - 39.5 - up to here -BC -CFBA -DFBC - -FBC -DFBA - 42.5 - Ø 43 -CA -FBA -FCA - - - - 35 - GSA 245 Ø 58 -CB -BFBA -DFBB - -FBB -DBFBA - 40 -

D1 -CC -CFBA -DFCC - -FBC -DFCB - 44 - D2

— Table 13. Ordering particulars for solid rod conductor for GSA 245 Division at flange No division Terminal type Mass (kg) Bushing Upper part Ø 18 (2x) Cat. No. LF 170 081 Lower part Solid rod Cu Al LF 130 245 -BB -JBA LF 170 082-GBB - Brazing 73 - -BB -JBA 1ZSC029106-AAA - Screw terminal 74 - 50 105 -BB - - 1ZSC028820-AAA Screw terminal - 23

25 -BD -JBA LF 170 082-GBD - Brazing 80 - -BD -JBA 1ZSC029106-AAB - Screw terminal 81 - GSA 245 -BD - - 1ZSC028820-AAB Screw terminal - 25

— 11 Solid rod conductor connections. 16 GSA-OA RIP TRANSFORMER BUSHING TECHNICAL GUIDE

Separate screw terminal plate with bolts End shield The separate terminal plate is available for studs The end shield is required for the GSA 245 if a with ø 30 mm and used for connecting the solid rod conductor with a screw terminal will be bushing to the line conductor. used. The shield is made of aluminum and insulated with epoxy paint. — Table 14. Terminal plate — Material Cat. No. Table 15. End shield Aluminum LF 170 014-A Material Cat. No. Nickel plated copper LF 170 021-A Aluminum LF 170 046-BL

145 107 75 40 17.5

40 75

D=30.5 17.5

<32 13

M12

— 12 End shield for the GSA 245.

— 13 Separate screw terminal plate. GSA-OA RIP TRANSFORMER BUSHING TECHNICAL GUIDE 17

Arcing horns Arcing horns made of galvanized steel can be mounted on the bushing. The arcing horns are available for studs with ø 30 mm.

The lower rod is fastened onto the flange with one of the fixing screws and the upper rod by means of a bracket on the outer terminal.

The gap distances for standard arcing horns are shown in the table. Other gap distances on request.

— Table 16. Arcing horns C

Type GSA-OA Cat. No. K (mm) C (mm) H (mm) 52 LF 170 004-A 230–440 315 112 73 LF 170 004-A 400–620 315 112 K 100 LF 170 004-G 400–780 315 112 123 LF 170 004-G 620–960 315 114 145 LF 170 005-A 700–1080 380 224 170 LF 170 005-B 820–1290 380 224 245 On request

H

— 14 Arcing horns. 18 GSA-OA RIP TRANSFORMER BUSHING TECHNICAL GUIDE

— Testing

Standards Test tap The GSA bushing is designed and tested The outer conducting layer of the condenser core according to IEC 60137, IEEE C57.19.00/01, and is connected to an insulated test tap on the CENELEC in applicable parts.. flange. During operation the protective cap must be fitted to earth the outer layer to the flange. Routine testing The maximum test voltage is 2 kV, 50 Hz for 1 The bushing is routinely tested according minute. The maximum service voltage is 600 V. to applicable standards. The tests include measurement of partial discharge quantity, tan δ, capacitance, dry power frequency voltage withstand-test. The flange is separately tightness tested with helium. A visual inspection is also performed.

An individual routine test protocol is delivered with each bushing from Hitachi ABB Power Grids.

Type testing Complete type tests have been performed and reports are available on request.

Seismic qualification — GSA-OA 170 has been qualified in shake table 15 Test tap. tests for High Performance Level IEEE 693‑2005. GSA-OA 245 has been qualified in shake table tests for High Performance Level IEEE 693‑2018. Test tap adapter Executed tests also satisfy seismic requirements For testing, a special test adapter is required for for AG5 (0.5g) of IEC TS 61463. permanent connection of the test tap to the measuring circuits. Special tests A number of tests not specified by international standards have also been performed and reports are available on request.

— 16 Test tap adapter, 1ZSC003881-AAC. GSA-OA RIP TRANSFORMER BUSHING TECHNICAL GUIDE 19

— Additional information

Clearance distance for transformer The maximum stresses in the oil at the surface of the conductor insulation must be limited to those values normal for insulated conductors and similar components in the same transformer.

The adjacent recommendations are intended as Space for current transformer guidelines when complete calculations are not carried out. min R2

— Table 17. Clearance distance 45° Internal insulation level Distance to earthed min R5 Type GSA of transformer (kV) parts R (mm) Earthed 60° layer 52 250-95 75 73 350-140 90 100 450-185 140 123 550-230 145 145 650-275 165 Distance to flat surface R 170 750-325 190 e.g. tank or core clamp 245 1050-460 265

— 17 Recommendations for positioning. 20 GSA-OA RIP TRANSFORMER BUSHING TECHNICAL GUIDE

Long term storage The bushing is surrounded by a sealed moisture- proof wrapping material together with a drying agent upon delivery. The supplied protective wrapping shall not be opened if the bushings are intended to be stored. After the transformer test, it is also important to reseal the bushing with the supplied protective wrapping or a similar moisture-proof wrapping, together with a drying agent. The wrapping works as a protection for transportation and storage (≤ 6 months). Note that bushings with standard wrapping shall be stored protected from precipitation.

For longer storage times (>6 months) a container have to be ordered separately.

— Table 18. Long term storage container Bushing Long term storage container Cat. No. Cat. No. LF130052-BA 1ZSC004796-AAA LF130073-BA LF130052-BB 1ZSC004796-AAB LF130073-BB LF130052-BC 1ZSC004796-AAC LF130073-BC LF130123-BA LF130145-BA 1ZSC004796-AAD LF130170-BA LF130123-BB LF130145-BB 1ZSC004796-AAE LF130170-BB LF130123-BC LF130145-BC 1ZSC004796-AAF LF130170-BC LF130245-BB 1ZSC004796-AAM LF130245-BD

— 18 GSA 145 with long term storage container. GSA-OA RIP TRANSFORMER BUSHING TECHNICAL GUIDE 21

— Inquiry sheet

When ordering, please state: • Type and catalogue number for bushing. • Catalogue number for inner terminal or conductor, lower and upper part. • Catalogue number for outer terminal. • Additional accessories or modifications. • Test required, in addition to the normal routine tests.

Table 19. Bushing ordering Ordering part Ordering Cat. No. GSA type See "Table 3. Dimensions" on page 8.

Outer terminal See "Table 7. GSA 52-170 Outer terminal" on page 12 or "Table 8. GSA 245 Outer terminal" on page 12.

Outer shield See "Table 9. GSA 245 Outer for GSA 245 shield" on page 12.

Inner terminal See "Table 10. GSA 52-170 for draw lead Inner terminal" on page 13 or "Table 11. GSA 245 Inner terminal" on page 13. Solid rod conductor See "Table 12. Ordering particulars for solid rod conductor for GSA 52–170" on page 15 or "Table 13. Ordering particulars for solid rod conductor for GSA 245" on page 15. Terminal plate See "Table 14. Terminal plate" on page 16.

End shield See "Table 15. End shield" on page 16. 22 GSA-OA RIP TRANSFORMER BUSHING TECHNICAL GUIDE

Ordering part Ordering Cat. No. Arcing horns See "Table 16. Arcing horns" on page 17.

Additional accessories For example see "Test tap or modifications adapter" on page 18.

Storage container See "Table 18. Long term storage container" on page 20.

Table 20. Tools ordering Ordering tool Ordering Cat. No. Lifting tool 2183 789-2 For GSA 52-170. Max load 125 kg. 2183 789-3 For GSA 245. Max load 490 kg. Pull-through cord 9760 669-A, -D For assembly and disassembly of the draw lead/conductor rod.

Table 21. Spare parts ordering Ordering spare part Ordering Cat. No. Test tap cover 2749 528-B Test tap O-ring 1ZSC001606-AAW

— Hitachi ABB Power Grids Sweden, Components SE-771 80 Ludvika Sweden E-mail: [email protected] www.hitachiabb-powergrids.com/offering/product-and-system/transformer

© Copyright 2020 Hitachi ABB Power Grids. All rights reserved.

Specifications subject to change without notice. 1ZSE 2750-111 en, Rev. 12, 2020-09-21