SC 14 - Data element principles

Assists in the selection of tap-changers designed in accordance with IEC 60214-1 for use in conjunction with the tapped windings of transformers or reactors. Also assists in understanding the various types of tap-changers and their associated equipment available. Covers both on-load tap-changers and off-circuit tap-changers.

Identifies the requirements for power transformers to sustain without damage the effects of overcurrents originated by external short circuits. Describes the calculation procedures used to demonstrate the thermal ability of a power transformer to withstand such overcurrents and both the special test and the theoretical evaluation method used to demonstrate the ability to withstand the relevant dynamic effects.

Gives insulation requirements for power transformers and the corresponding insulation tests for specific windings. Applies to single-phase and three-phase oil-immersed power transformers as defined in the IEC 60076-1. It Includes appendices on: partial discharge measurements during induced a.c. withstand voltage test on transformers; overvoltage transferred from a high-voltage winding to a low-voltage winding; information to be supplied with enquiries and orders.[
]The contents of the corrigendum of December 2000 have been included in this copy.

Applies to three-phase and single-phase transformers including autotransformers. Defines the rating and connection symbols. Gives certain specifications for transformers having a tapped winding. Defines information which shall be marked on the rating plate and the tests to be conducted. Supersedes IEC 60076-1(1976) and IEC 60076-4 (1976).[
]The contents of the corrigendum of June 1997 have been included in this copy.[
]This consolidated version consists of the second edition (1993) and its amendment 1 (1999). Therefore, no need to order amendment in addition to this publication.