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Technical guide 1 On-load tap-changers type UBB Technical guide CManufacturer ? s declaration The manufacturer ABB Components AB SE- LUDVIKA Sweden Hereby declares that The products On-load tap-changers type UB with motor-drive mechanisms types BUE and BU

On-load tap-changers type UBB Technical guide CManufacturer ? s declaration The manufacturer ABB Components AB SE- LUDVIKA Sweden Hereby declares that The products On-load tap-changers type UB with motor-drive mechanisms types BUE and BUL comply with the following requirements By design the machine considered as component on a mineral oil ?lled power transformer complies with the requirements of ? Machinery Directive EEC amended EEC and EEC and EEC marking provided that the installation and the electrical connection be correctly realized by the manufacturer of the transformer e g in compliance with our Installation Instructions and ? EMC Directive EEC regarding the intrinsic characteristics to emission and immunity levels and ? Low Voltage Directive EEC modi ?ed by Directive EEC concerning the built-in motor and apparatus in the control circuits Certi ?cate of Incorporation The machines above must not be put into service until the machinery into which they have been incorporated have been declared in conformity with the Machinery Directive Date - - Signed by Title Olof Heyman Manager of Division for tap-changers This Technical Guide has been produced to allow transformer manufacturers and their designers and engineers access to all the technical information required to assist them in their selection of the appropriate on-load tap- changer and motor-drive mechanism The guide should be used in conjunction with the Selection Guide and the Design Guides to allow the optimum selection to be made The technical information pertaining to on- load tap-changers and motor-drive mechanisms manufactured by ABB Components has been divided and is contained in separate documents with one document for each type The information provided in this document is intended to be general and does not cover all possible applications Any speci ?c application not covered should be referred directly to ABB Components AB or its authorized representative ABB Components AB 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 ABB Components also manufactures the following products Transformer bushings Wall bushings GIS bushings Transformer cooling equipment CTable of Contents General Information Design Principles On-Load Tap-Changer Selector Switch Transition Resistors Change-over Selector Geneva Gear Selector Switch Housing Oil Conservator Motor-Drive Mechanism Type BUL Type BUE Special Applications Accessories Principles of Operation On-Load Tap-Changer Switching Sequence Selector Switch Change-over Selector for Plus Minus Switching Change-over Selector for Coarse Fine Switching Characteristics and Technical Data On-Load Tap- Changer Type Designation Rated Phase Step Voltage Standards and Testing Rating Plate Contact Life Mechanical Life Insulation Levels Short Circuit Current Strength Highest Phase Service Voltage Across the Regulating Winding Tie-in Resistors Rated Through Current Maximum Rated Through Current Occasional Overloading Oil Temperature Conductors from the Windings Design Installation and Maintenance On-Load Tap-Changer Schematic Diagrams Drying Painting Weights Oil Filling Installation Maintenance Oul Filter Unit Pressure Relay General Description Design Operation Function Pressure Testing Dimensions On-Load Tap-Changer Type UBB Motor- Drive Mechanism Design Installation Maintenance Dimensions Drive Shaft