1ZSE en, Rev. 3. Wall bushings, type GSA-AA Technical guide
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1 1ZSE en, Rev. 3 Wall bushings, type GSA-AA Technical guide
2 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 ABB, or its authorized representative. ABB makes no warranty or representation and assumes no liability for the accuracy of the information in this document or for the use of such information. All information in this document is subject to change without notice. This document must not be copied without our written permission, and the contents thereof must not be imparted to a third party nor be used for any unauthorized purpose. Contravention will be prosecuted.
3 Content Design... 4 Standards... 4 Features and benefits... 4 Transportation and long term storage... 5 Common specifications... 5 Testing... 6 Routine testing... 6 Type tests... 6 Special tests... 6 Test tap... 6 Electrical data... 7 Dimensions... 8 Connection details... 9 Outer terminal... 9 Solid rod conductor Separate terminal plate with bolts Arcing horns Conductor loading Short-time current Recommendations for positioning Ordering particulars... 14
4 Design GSA-AA is a Resin Impregnated Paper (RIP) bushing with Silicone Rubber (SiR) insulator. The condenser body is directly covered with silicone rubber to give a compact and lightweight bushing that contains no oil or other liquids or gases. Outer terminal The GSA bushings are produced by winding a crêped paper web onto a mandrel, with aluminium foil inserts for electrical field control. The body is vacuum impregnated and cured giving a partial discharge free bushing with low tan d (dissipation factor). After curing, the body is machined and the flange is attached. Silicone rubber insulator The insulator is perfectly bonded to the RIP body in a patent applied for process, giving protection from the environment. The conductor is fixed to the top piece with a divided ring (patented by ABB). A solid rod of copper or aluminium is used as conductor. Test tap Mounting flange The outer terminal is available in a number of standard configurations in aluminium and copper, but can also be modified to suit any connection need. The flange and the top piece are protected from corrosion. The standard colour of the mounting flange and of the insulator is RAL 7035, light grey. Standards The GSA bushing is specified and tested according to IEC and IEEE C /01 in applicable parts. RIP body Features and benefits Solid Reduced risk for fire, any mounting angle possible, oil leakage from the bushing eliminated, no monitoring of pressure and oil level. Solid conductor Fig. 1. Wall bushing type GSA-AA. Non-shattering materials Protection of personnell and equipment, easy handling, safe transport, high seismic withstand Light weight, compact Easy handling, and low life cycle environmental impact. Silicone rubber insulator Superior electrical performance, cleaning normally not needed. 4 Technical guide GSA-AA 1ZSE en, Rev. 3
5 Transportation and 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. The wrapping works as protection for transportation and storage (< 6 months). For longer storage time, contact ABB. Common specifications For conditions exceeding the standard specification, please consult the supplier. Application: Classification: Ambient temperature: Altitude of site: Level of rain and humidity: Pollution level: Angle of mounting: Test tap: Capacitance C 2 of test tap: Length of earthed sleeve: Arcing horns: Conductor: Markings: Walls Resin impregnated paper, capacitance graded, outdoor-indoor / indoor bushing +40 C to -40 C, minimum value acc. to temperature class 2 of IEC < m 1-2 mm rain/min. horizontally and vertically, acc. to IEC , and 5 mm/min as per IEEE. According to specific creepage distance and IEC Horizontal - vertical Test tap with 4 mm male contact pin < pf According to table. Other dimensions upon request. Optional equipment Solid conductor Conforming to IEC/IEEE 1ZSE en, Rev. 3 Technical guide GSA-AA 5
6 Testing Routine testing The bushing is routine tested according to above standards. The tests include measurement of partial discharge quantity, tan δ, capacitance, dry power frequency voltage withstand test. A visual inspection is performed. An individual routine test protocol is delivered with each bushing from ABB. Test tap The outer conducting layer of the condenser body is connected to an insulated test tap on the flange. During operation the protective cap must be screwed on to earth the outer layer to the flange. The maximum test voltage is 2 kv, 50 Hz for 1 minute. The maximum service voltage is 600 V. Type tests Type tests have been performed according to above standards and summaries are available on request. Special tests Tests not specified by the above standards have also been performed and summaries are available on request. Fig. 2. Test tap. 6 Technical guide GSA-AA 1ZSE en, Rev. 3
7 Electrical data Ratings GSA-AA Rated voltage IEC (kv) Rated phase-to-earth voltage IEC (kv) Insulation class IEEE (kv) Rated line-to-ground voltage IEEE (kv) Basic Insulation Level (kv) (Equal to dry lightning impulse withstand voltage.) Rated current (A) Rated frequency (Hz) 50/60 50/60 50/60 Temporary over voltage (kv) Wet power frequency AC (kv) Routine test 1 minute dry (kv) Nominal capacitance between conductor and test tap C1 ±10 % (pf) ZSE en, Rev. 3 Technical guide GSA-AA 7
8 Dimensions D8 D9 L5 R8 L2 L7 L4 7 R5 R8 R2 R2 24 L L8 D1 R L1 D ø15 x n1 Hole design for GSA T 2 Hole design for GSA M12 D5 D6 D7 Fig. 3. Dimensions. Dimensions are subject to modification without notice. Dimensions in mm Arcing Type GSA Rated current (A) Cat. No. Net mass (kg) Total L Indoor side L1 Outdoor side L2 Top part L5 distance outdoor L7 Flange height L8 Condenser body outer D1 Center hole D LF CA LF CD LF BD Technical guide GSA-AA 1ZSE en, Rev. 3
9 Connection details Outer terminal The outer terminal needs to be specified in each case. The outer terminal is then used together with a solid rod. D The outer terminal is available in a number of standard configurations. Any other configuration can be quoted upon request. Outer terminal for GSA52-AA and GSA73-AA Material Stud diameter (mm) Cat. No. LF Mass (kg) Aluminium 60 -BA *) BB *) 2.2 Copper 60 -BC *) 7.6 *) Standard 30 -BD *) 5.0 Outer terminal for GSA123-AA Material Plating Stud diameter (mm) Cat. No. LF Aluminium A *) 2.3 Copper - Mass (kg) B *) C *) 6.2 -D *) 3.6 Tin 60 -E 6.2 Tin 30 -F 3.6 Silver 60 -G 6.2 Silver 30 -H O-ring Tightening ring Fig. 4. Outer terminal. Terminal stud Divided ring *) Standard Top piece Min. gasket surface inner Hole Insulator Number Flange diameter D9 diameter D5 circle D6 Flange D7 sheds D8 of holes n1 thickness T Cantilever load Max. permitted loading Creepage distance perpendicular to the terminal total (mm) protected (mm) (N) Test (N) ZSE en, Rev. 3 Technical guide GSA-AA 9
10 Solid rod conductor The conductors are produced from copper or aluminium solid rods ending in an outer terminal for the indoor side. D1 D2 Solid copper conductor Catalogue number Bushing Mass (kg) Stud diameter (mm) LF JBCD GSA52-AA ABCD GSA73-AA BBCD - " CBCD - " ADBD GSA123-AA BDBD - " Solid aluminium conductor Catalogue number Bushing Mass (kg) Stud diameter (mm) LF DBCD GSA73-AA EBCD - " FBCD - " CDBD GSA123-AA DDBD - " Fig. 5. Solid rod conductor. D Separate terminal plate with bolts The separate terminal plate is available for stud with ø 30 mm, and used for connecting the bushing to the line conductor. Material Cat. No. Aluminium LF A Copper alloy LF A Fig. 6. Separate terminal plate with bolts. 10 Technical guide GSA-AA 1ZSE en, Rev. 3
11 Arcing horns Arcing horns of galvanised steel can be mounted on the bushing. The arcing horns are available for stud 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. K H C Bushing type K (mm) C (mm) H (mm) GSA GSA GSA Fig. 7. Gap distances. 1ZSE en, Rev. 3 Technical guide GSA-AA 11
12 Conductor loading The GSA bushings fulfil the temperature rise test requirements according to IEC and IEEE for the currents below: Rated current of bushing (A) Rated voltage Conductor Permissible current, IEC (A) (kv) 1300 AC/DC 123 Solid rod, Al Ø 49 mm AC/DC 123 Solid rod, Cu Ø 49 mm AC/DC 73 Solid rod, Al Ø 87 mm AC/DC 52 Solid rod, Cu Ø 87 mm AC/DC 73 Solid rod, Cu Ø 87 mm 4000 Short-time current The rated thermal short-time current (I th ) is calculated according to IEC Conductor Rated current (A) Area (mm 2 ) Short-time current (I th ) Dynamic current (I d ) ka, 1 s 2 s peak Solid rod, Ø 49 mm Cu Solid rod, Ø 49 mm Al Solid rod, Ø 87 mm Cu Solid rod, Ø 87 mm Al Technical guide GSA-AA 1ZSE en, Rev. 3
13 Recommendations for positioning The bushing is intended for any mounting angle. Max. 230 mm without reducing the rating Fig. 8. Recommendations for positioning 1ZSE en, Rev. 3 Technical guide GSA-AA 13
14 Ordering particulars 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. ABB GSA52-OA/2000/0.3 Ludvika, Sweden LF BB No. Ur/Uy 52/46 kv Ir 2000 A 50/60 Hz LI / SI / AC 250 / - / 120 kv M 16 kg L 445 mm 0-90 C1 pf Tan δ % C2 pf Tan δ % Fig. 13. Nameplate with marking example. 14 Technical guide GSA-AA 1ZSE en, Rev. 3
15
16 Contact us ABB AB Components SE Ludvika, Sweden Phone: Fax: Copyright 2013 ABB, All rights reserved. 1ZSE en, Rev. 3,
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