TRANSFORMER BUSHINGS COT
24Pages

OIP Transformer Outdoor Bushings Type COT(C) 125.. .COT (C) 1800 24kV to 550kV up to 5000A IEC 60137-2008

Features If you need any transformer bushing proven in opration conditions around the world, Trench has it ! (h experience in manufacturing of bushings for more than 100 years available with porcelain or composite insulator on air side 1 capacitive fine graded oil-paper 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...

Cut view General design Design 1 2 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. Assembly The whole bushing is tightened together by the central tube or conductor. Head Al-casted head with oil expansion chamber and oil level indicator. The chamber is hermetically sealed against several environmental conditions. Active part The active part is made of oil-impregnated wide band paper with layers of aluminium foil to...

One of several TRENCH winding machines Page 4 / 24 40497230_00 Substitute for E 322.81&E 322.91

High voltage test laboratory Page 5 / 24 40497230_00 Substitute for E 322.81&E 322.91

CT* M O CD -* O m ootn ooooo I fS 8 8 ooooooN01 lt t.u o O O 2 S ■1 s s < S < iB 5 §§ > il §§ 33 I M 33 II B z Highest vottage (Um) o a Maximum phase to oarth voltago Bushing Dry Power frequency voltage withstand (AC) Transformer Power frequency voltage withstand (AC) Lightning Impulse w il h stand voltage (BIL) Switching Impulse wet (SIL): 250/2500^1Rated currentllr) ss 5 s g ! a O O O* O O Ut O O O O O O O O o 8S 3 n o ^ 111 o MiUitlliniiH! -non " S S S n o o Q o o n S X s ? 8 S ܻqq*ii Connection to Transformer n O a a a n S o o o D 5 5 a Q. CL rr j o d o 1{** ■ Ut 1 ■ I ■ i !;; CT Space...

Porcelain and composite insulator Porcelain Insulator (Type COT) Composite Insulator (Type COTC) Brown color Gray color Alternate sheds Helicoil sheds (RAL 8016) (ANSI gray N70) (ANSI gray N70) (ANSI gray N70) All COT(C) can be equipped with silicone rubber insulators upon request without affecting dimensions except D4 Page 13 / 24 40497230_00 Substitute for E 322.81&E 322.91

Standard Oil level indicator COT 125, COT 170 Oil level indicator COT 250 ... COT 1050 1/ 060 Fig. 6 Fig. 7 Test tap (2kV) O-ring gasket Air escape screw Fig. 8 Fig. 9 Page 14 / 24 40497230_00 Substitute for E 322.81&E 322.91

Options Magnetic oil level indicator (095) COT 250 ... COT 1800 Arcing horns Type S min max mm COT 125 - - COT 170 - - COT 250 220 270 COT 325 300 390 COT 450 430 520 COT 550 420 650 COT 650 500 750 COT 750 500 850 COT 1050 750 1200 S Fig. 10 Fig. 11 Voltage tap according to ANSI/IEEE (20kV) Multiple spring contact Oil sampling device Valve Fig. 12 Fig. 13 Page 15 / 24 40497230_00 Substitute for E 322.81&E 322.91

Recommendations for lead out arrangement Embedded shield External 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 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 550...750 COT 1050 Cable insulation and distance to grounded parts 28 040 Type Min. insulation thickness S Min. distance to grounded parts R R1 mm COT 125 5...

Removable split conductor COT 125 ... COT 1175 1250 A Removable split conductor Fig. 18 Oil side end COT 125, COT 170 . 1000A . 1250A 1600 ... 3150A 040 040 125 30 Cable Fig. 19 Removable copper conductor Fig. 20 Fixed copper-conductor Fig. 21 Page 17 / 24 40497230_00 Substitute for E 322.81&E 322.91

Oil side end COT 250 ... COT 450 ... 1000A ... 1250A ... 1600 A 30 90 Cable Fig. 22 Removable copper conductor Fig. 23 Fixed copper-conductor Fig. 24 . 2500A ... 3150A 125 125 Fixed copper-conductor Fig. 25 Fixed copper-conductor Fig 26 Page 18 / 24 40497230_00 Substitute for E 322.81&E 322.91

Oil side end COT 550 ... COT 750 ... 1000A i ... 1250A ... 1600 A 30 90 28 41 Cable Fig. 27 Removable copper conductor Fig 28 Fixed copper-conductor Fig. 29 . 2500A ... 3150A 22,5 195 125 040 086 0114 Fixed copper-conductor Fig 30 Fixed copper-conductor with removable screwed shield Fig 31 Page 19 / 24 40497230_00 Substitute for E 322.81&E 322.91

Oil side end COT 1050, Um = 245 kV ... 1000A ... 1250A ... 1600 A 30°/ 50 30 90 78 Cable Fig. 32 Removable copper conductor Fig 33 Fixed copper-conductor Fig. 34 ... 3150A . 2500A 125 230 Fixed copper-conductor Fig 35 Fixed copper-conductor with removable screwed shield Fig 36 Page 20 / 24 40497230_00 Substitute for E 322.81&E 322.91

Oil side end COT 1050, Um = 300 kV ... 1000A ... 1600A 30° 50 90 Cable Fig. 37 Fixed copper-conductor Fig 38 ... 2500A 230 Fixed copper-conductor with removable screwed shield Fig. 39 Page 21 / 24 40497230_00 Substitute for E 322.81&E 322.91

Oil side end COT 1175 ... 1300 ... 1000A ... 1600A 120 Oil side connector according to customer request Fixed conductor Fig 41 Cable with fixed shield Fig. 40 COT 1425 ... 1800 . 1000A . 1600A 280 Oil side connector according to customer request Fixed conductor Fig. 43 Cable with fixed shield Fig. 42 Page 22 / 24 40497230_00 Substitute for E 322.81&E 322.91

Oil side end : External shields Page 23 / 24 40497230_00 Substitute for E 322.81&E 322.91

Product Range Quality Bushings for Power Transformers up to 550 kV, 5000A Օ High Current Application up to 52 kV, 40000 A Transformer to SF6 connection up to 550kV Օ Gas-insulated Switchgear (GIS) up to 800 kV, 6000A Generators up to 36 kV, 50000 A Օ Railways Buildings , Wall up to 245 kV, 5000 A Օ Bushings according Standard IEC 60137 Bushings according to customer's special specification At Trench quality is a way of life. Trench quality assurance complies with the most stringent standard of ISO 9001. Certified by AFAQ since 1994 Certificat Trench® China MWB (Shanghai) Co., Ltd No....