OIP Transformer Outdoor Bushings Type COT(C) 125 COT (C) kV to 550kV up to 5000A IEC

Transcription

1 OIP Transformer Outdoor Bushings Type COT(C) 125 COT (C) kV to 550kV up to 5000A IEC

2 Features If you need any transformer bushing proven in operation conditions around the world, Trench has it! experience in manufacturing of bushings for more than 100 years capacitive fine graded oilpaper insulation with long experience computer optimized electrical field distribution proven high electrical withstand against transient or impulse stresses excellent long term stability due to extremely low partial discharge and power loss factor oil immersed part covered by epoxy resin tube providing high impact resistance available with porcelain or composite insulator on air side inclination in service up to 30 from vertical. For COT(C) 125 and COT(C) 170 even horizontal operation is possible horizontal transport for all types possible tan α and PD-values more than twice as good as requested by IEC current rating can easily be increased by exchanging the cable bolt with a removable split conductor on existing bushing electrode embedded in the lower epoxy resin part - avoids external shielding - reduces distance to ground - lower transformer costs To preserve our environment the free oil volume in COT-bushings is minimized Transformer Bushings Type COT(C) 125 to COT(C) 1800 porcelain cemented into flange provides higher mechanical strength than level II of IEC Certified ISO 9001 Page 2 / _00

3 Design 10 Cut view General design 1 1 Top terminal Terminal (Aluminium or Copper) for connection of overhead lines or bus bars and arcing horns. Trench design provides a maintenance free termination and ensures that the connection will not become loose in service. 2 Assembly The whole bushing is tightened together by the central tube or conductor. 3 Head Al-casted head with oil expansion chamber and oil level indicator. The chamber is hermetically sealed against several environmental conditions. 4 Oil filling COT bushings are filled with dried, degassed insulating mineral oil. 5 Insulator Porcelain insulator made of high grade electrotechnical porcelain according to IEC The insulator is connected to the mounting flange using cement and sealed with O-ring gasket. instead of porcelain a composite insulator is also available. 6 Active part The active part is made of oilimpregnated wide band paper with layers of aluminium foil to control the electrical field radially and axially. Depending on the current rating, the paper and foil are wound on either a central tube or solid conductor 7 Flange Mounting flange with integrated test tap made of corrosion free aluminium alloy, machined to ensure an excellent seal between the bushing and the transformer. 8 CT-Pocket If current transformers are required on the bushing, the ground sleeve can be extended. 9 Oil side end The insulator on the oil side is made of an epoxy resin tube. It is designed to stay installed during the in-tank drying process of the transformer and can withstand temperatures up to 130 C. 10 End-shielding For voltages starting between 52kV & 300kV a special aluminium electrode is casted into the end of the epoxy resin tube. This end shielding controls the electrical field strength in this area to ground Page 3 / _00

4 One of several TRENCH winding machines Test tap for C and tan measurement Page 4 / _00

5 High voltage test laboratory Epoxy insulator with embedded end shield Cut view Insulation See page 16 Cable Page 5 / _00

6 Type COT N Type Highest voltage (Um) Maximum phase to earth voltage Bushing Dry Power frequency voltage withstand (AC) Transformer Power frequency voltage withstand (AC) Lightning Impulse withstand voltage (BIL) Switching Impulse wet (SIL): 250/2500µs Rated current (Ir) Connection to Transformer Cable cross section Conductor CT Space L4 see fig.3 page 12 AD Arcing distance (min.) Standard creepage distance Mass Approx. Cantilever test load (min) kv kv kv kv kv kv A mm² mm mm mm mm kg N 01 COT / 800 cable cable 1 ) rem.co-cond. 2 ) fixed Co-cond fixed Co-cond fixed Co-cond COT / 800 cable * cable 1 ) 400 * rem.co-cond. 2 ) 35 * fixed Co-cond. - * fixed Co-cond. - * fixed Co-cond. - * COT / 800 cable cable 1 ) rem.co-cond. 2 ) fixed Co-cond fixed Co-cond fixed Co-cond COT , / 800 cable cable 1 ) rem.co-cond. 2 ) fixed Co-cond fixed Co-cond fixed Co-cond COT / 800 cable cable 1 ) rem.co-cond. 2 ) fixed Co-cond fixed Co-cond fixed Co-cond Standard: 0, 300, mm / kv 25mm/kV 25mm/kV Comments related to columns 1 33: 09: 1 ) Class F insulation 04: Bushings test voltage at 50Hz 60 sec. 2 ) Removable solid rod copper conductor Connection system see pages 17 to 23 11: Extension for current transformer (other extensions on request) 13: * 31mm/kV in standard Page 6 / _00

7 Type COT Rated current (Ir) L L 1 L 2 L 3 L 6 L 7 D D 2 D 3 D 4 D 5 D 6 D 7 min øt n e see fig. A mm mm , 13: Brown glazed porcelain, other colours and 16, 17: L 1 depends on L 4. The values in the table are valid Other creepage distances upon request for L 4= 0mm. If L 4>0mm add L 4 to L 1 and L. 15: According to IEC 137 level II or better 24, 25, 29, 32: Other dimensions on request. Page 7 / _00

8 Type COT N Type Highest voltage (Um) Maximum phase to earth voltage Bushing Dry Power frequency voltage withstand (AC) Transformer Power frequency voltage withstand (AC) Lightning Impulse withstand voltage (BIL) Switching Impulse wet (SIL): 250/2500µs Rated current (Ir) Connection to Transformer Cable cross section Conductor CT Space L4 see fig.3 page 12 AD Arcing distance (min.) Standard creepage distance Mass Approx. Cantilever test load (min.) kv kv kv kv kv kv A mm² mm mm mm mm kg N 01 COT / 800 cable cable 1 ) rem.co-cond. 2 ) fixed Co-cond fixed Co-cond fixed Co-cond COT / 800 cable cable 1 ) rem.co-cond. 2 ) fixed Co-cond fixed Co-cond fixed Co-cond COT / 800 cable cable 1 ) rem.co-cond. 2 ) fixed Co-cond fixed Co-cond. - * fixed Co-cond COT cable cable 1 ) rem.co-cond. 2 ) fixed Co-cond fixed Co-cond fixed Co-cond COT Cable fixed Co-cond fixed Co-cond Standard: 0, 300, mm / kv Comments related to columns 1 33: 04: Bushings test voltage at 50Hz 60 sec. 09: 1 ) Class F insulation 2 ) Removable solid rod copper conductor 11: Extension for current transformer (other extensions on request) Connection system see pages 17 to 23 13: * 31mm/kV in standard Page 8 / _00

9 Type COT Rated current (Ir) L L 1 L 2 L 3 L 6 L 7 D D 1 D 2 D 3 D 4 D 5 D 6 D 7 min øt n e see fig. A mm mm , 13: Brown glazed porcelain, other colours and 16, 17: L 1 depends on L 4. The values in the table are valid Other creepage distances upon request for L 4= 0mm. If L 4>0mm add L 4 to L 1 and L. 15: According to IEC 137 level II or better 24, 25, 29, 32: Other dimensions on request. Page 9 / _00

10 Type COT N Type Highest voltage (Um) Maximum phase to earth voltage Bushing Dry Power frequency voltage withstand (AC) Transformer Power frequency voltage withstand (AC) Lightning Impulse withstand voltage (BIL) Switching Impulse wet (SIL): 250/2500µs Rated current (Ir) Connection to Transformer Cable cross section Conductor CT Space L4 see fig.3 page 12 AD Arcing distance (min.) Standard creepage distance Mass Approx. Cantilever test load (min) kv kv kv kv kv kv A mm² mm mm mm mm kg N 01 COT cable 630 Standard: 0, 300, mm / kv 25m m/kv Fixed cond Fixed cond COT cable Fixed cond Fixed cond COT cable * Fixed cond * Fixed cond * COT cable Fixed cond Fixed cond COT cable Fixed cond Fixed cond COT cable Fixed cond Fixed cond Comments related to columns 1 33: 04: Bushings test voltage at 50Hz 60 sec. 11: Extension for current transformer (other extensions on request) Connection system see pages 17 to 23 13: * 31mm/kV in standard for Type COT 1425 Page 10 / _00

11 Type COT Rated current (Ir) L L 1 L 2 L 3 L 6 L 7 D D 1 D 2 D 3 D 4 D 5 D 6 D 7 øt n e see fig. A mm mm , 13: Brown glazed porcelain, other colours and 16, 17: L 1 depends on L 4. The values in the table are valid Other creepage distances upon request for L 4= 0mm. If L 4>0mm add L 4 to L 1 and L. 15: According to IEC 137 level II or better 24, 25, 29, 32: Other dimensions on request. Page 11 / _00

12 Dimensional Drawing D6 View A L6 D5 AD L3 L2 Fig. 1 Fig. 2 COT (Um =245kV), 3150 A D4 L COT 1050 (Um=300kV), 2500A COT e L7 L1 D1 Only for COT 420 kv L4 30 L1 D7 D Fig. 3 Fig. 4 Fig. 5 Page 12 / _00

13 Porcelain and composite insulator Porcelain Insulator (Type COT) Composite Insulator (Type COTC) Brown color (RAL 8016) Gray color (ANSI gray N70) Alternate sheds (ANSI gray N70) Helicoil sheds (ANSI gray N70) D4 D4 D4 D4 All COT(C) can be equipped with silicone rubber insulators upon request without affecting dimensions except D4 Page 13 / _00

14 Standard Oil level indicator COT 125, COT 170 Oil level indicator COT 250 COT 1050 Ø20 Ø60 Fig. 6 Fig. 7 Test tap (2kV) Air escape screw O-ring gasket 22 6 Multiple spring contact Flat gasket Fig. 8 Fig. 9 Page 14 / _00

15 Options Magnetic oil level indicator (Ø95) COT 250 COT 1800 Arcing horns Type min S max mm COT S COT COT COT COT COT COT COT COT Fig. 10 Fig. 11 Voltage tap according to ANSI/IEEE (20kV) Oil sampling device Multiple spring contact Valve Fig. 12 Fig. 13 Page 15 / _00

16 Recommendations for lead out arrangement Embedded shield These bushings are equipped on the lower end with a cone shaped epoxy resin tube and an embedded electrode. Therefore, additional barriers or electrodes may be omitted and distance to ground is reduced External shield R1 R S Oil conditions: Mineral oil with less than 10ppm water content and dielectric strength higher than 60kV (acc. to IEC 60156) Fig. 14 Fig. 15 Draw lead insulation COT COT 1050 Ø35,7 Ø40 Cable insulation and distance to grounded parts Type Min. insulation thickness Min. distance to grounded parts S S 15 Ø80 (Um=245kV) Ø94 (Um=300kV) Fig. 16 Fig. 17 S R R1 mm COT COT COT COT COT COT COT COT COT COT 1175 to COT See spec Page 16 / _00

17 Removable split conductor COT 125 COT A Cable bolt Removable split conductor 30 3 fixing screws Position of standard split conductor. Others positions on request Fig. 18 Ø29 30 Oil side end COT 125, COT A 1250A A Ø40 Ø40 30 Ø Ø80 Conductor Ø35 Ø80 Ø40 Ø80 Cable Fig. 19 Removable copper conductor Fig. 20 Fixed copper-conductor Fig. 21 Page 17 / _00

18 Oil side end COT 250 COT A 1250A 1600 A 30 Ø29 8 Conductor Ø35 90 Ø35,7 Ø80 Ø80 Ø35 Ø80 Cable Fig. 22 Removable copper conductor Fig. 23 Fixed copper-conductor Fig A 3150A Ø40 Ø94 Fixed copper-conductor Ø40 Ø104 Fig. 25 Fixed copper-conductor Fig. 26 Page 18 / _00

19 Oil side end COT 550 COT A 1250A 1600 A Ø29 Conductor Ø35 90 Ø35,7 Ø68 Ø68 Ø35 Ø68 Cable Fig. 27 Removable copper conductor Fig. 28 Fixed copper-conductor Fig A 3150A 15 22, Ø40 Ø86 Ø114 Fixed copper-conductor Ø40 Ø160 Ø240 Fig. 30 Fixed copper-conductor with removable screwed shield Fig. 31 Page 19 / _00

20 Oil side end COT 1050, Um = 245 kv 1000A 1250A 1600 A Ø40 25 Ø29 90 Ø80 Conductor Ø38 Ø35 Ø119 Ø119 Ø119 Cable Fig. 32 Removable copper conductor Fig. 33 Fixed copper-conductor Fig A 3150A Ø40 Ø40 Ø95 Ø134 Fixed copper-conductor Ø180 Ø260 Fig. 35 Fixed copper-conductor with removable screwed shield Fig. 36 Page 20 / _00

21 Oil side end COT 1050, Um = 300 kv 1000A 1600A Ø Ø35 Ø95 Ø134 Ø95 Ø134 Cable Fig. 37 Fixed copper-conductor Fig A Ø40 Ø180 Ø260 Fixed copper-conductor with removable screwed shield Fig. 39 Page 21 / _00

22 Oil side end COT A 1600A Ø55 Ø110 Ø190 Cable with fixed shield Ø125 Oil side connector according to customer request Fig. 40 Fixed conductor Fig. 41 COT A 1600A Ø68 Ø Ø210 Ø330 Cable with fixed shield Ø160 Oil side connector according to customer request Fig. 42 Fixed conductor Fig. 43 Page 22 / _00

23 Oil side end : External shields FIXED SHIELD SHIELD WITH BAYONET SYSTEM Ø D 3 x M6 depth 15mm equidistant on a drilling diameter D Fig. 44 SCREWED SHIELD A Detail A Connection according to customer drawing Fig. 45 Fig. 46 Page 23 / _00

24 Product Range Bushings for Power Transformers up to 550 kv, 5000A High Current Application up to 52 kv, A Quality At Trench quality is a way of life. Trench quality assurance complies with the most stringent standard of ISO Certified by AFAQ since 1994 Transformer to SF6 connection up to 550kV Gas-insulated Switchgear (GIS) up to 800 kv, 6000A Generators up to 36 kv, A Railways Buildings, Wall up to 245 kv, 5000 A Bushings according Standard IEC Bushings according to customer s special specification Trench China MWB (Shanghai) Co., Ltd No. 3658, Jiancheng Road Minhang, Shanghai Peoples Republic of China Phone : Fax : Trench Limited Bushing Division 432 Monarch Avenue Ajax, Ontario Canada L1S 2G7 Phone : Fax : imprimerie de saint-louis troendlé bieler substitute for E &E _00 Trench France SAS 16, rue du Général Cassagnou B.P F Saint-Louis Cedex France Phone : Fax : Sales-bushing.fr@trench-group.com All rights reserved. Brands and trademarks used in this document are the property of Trench Subject to change without prior notice. The information in this document contains general descriptions of the technical options which are not necessarily available in every single case. The required features must therefore be defined in each individual case when concluding the contract.