Oil-insulated Current Transformers
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Current Transformers Type IOSK

Current Transformers Introduction Trench is a recognized world leader in the design and manufacture of high voltage equipment for application on electric utility and high energy industrial systems. As part of Trench's product scope, the company produces a diversified range of Instrument Transformers which are installed on 69-800 kV electrical systems. Instrument Transformers include: Voltage (Potential) Transformers (both inductive and capacitive type), Current Transformers and Combined Instrument Transformers (voltage and current transformer in one unit). Current Transformers must convert...

Features • Meet all IEC and ANSI metering and protection classes, including special core classes TPS, TPX, TPY and TPZ (other standards on request) • Rated primary currents up to 5000 A • Primary reconnection available • Rated secondary current 1 A, 2 A or 5 A • Rated short circuit withstand up to 200 kA peak • Quality Assurance in accordance with ISO 9001 • highly refined and processed oil/paper insulation system • essentially unaffected by stray external magnetic fields • Head type design of low weight and minimum oil volume • stable accuracy over a long period of time • use of high...

Construction Standard Equipment Trench type IOSK Current Transformers are defined as "head type" Current Transformers. These CT's are designed and constructed with the well proven, highly reliable, oil/paper insulation system. Each porcelain housed, hermetically sealed Current Transformer is equipped with stainless steel expansion bellows, calibrated to the internal oil volume and extremes in ambient and operating temperatures. • Aluminum flat pad primary terminal and ground terminal Customer specifications, such as application (metering or protection), number of cores, ratings, etc. have a...

72.5 - 170 kV 245 - 550 kV 11 3 11 2 2 10 1 3 10 14 1 14 12 15 13 12 15 13 4 4 6 8 5 7 7 9 8 5 6 9 1 2 3 4 5 6 7 8 9 10 11 12 13 Primary terminal Metallic expansion bellows Oil filling screw Porcelain insulator Secondary terminal box Secondary terminals Oil drain valve Grounding terminal Gland plate Lifting lugs Bellows indicator High voltage insulation Secondary winding and cores 14 Primary winding 15 Transformer head (aluminum) Without primary reconnection Primary reconnection 1:2 Primary reconnection 1:2:4 Secondary reconnection Fig.3 Electrical and mechanical design details 5

Trench Austria GmbH Paschinger Strasse 49, Postfach 13 A-4060 Linz-Leonding/Austria Phone +43.732.6793-0 Fax +43.732.6713 41 E-Mail sales@TrenchAustria.at Trench Brasil LTDA Via Expressa de Contagem, 2685 CEP 32370-485 Cpmtagem, MG - Brasil Phone 55. 31. 391-5959 Fax 55. 31. 391-1828 E-Mail trenchbrasil@ca.trenchgroup.com Trench Limited Coil Product Division 71 Maybrook Drive, Scarborough Ontario, Canada M1V 4B6 Phone (416) 298-8108 Fax (416) 298-2209 E-Mail sales@ca.trenchgroup.com Trench Limited Instrument Transformer Division 390 Midwest Road, Scarborough Ontario, Canada M1P 3B5 Phone...