Description
The present document introduces the setting calculation for the differential protection relay module SPCD 3D53 of the protection relay type SPAD 346 C3. The calculations with illustrative examples apply to two-winding power transformer applications.
Further, the document deals with differential protection of three-winding power transformers, motors, generators, motor and autotransformer combinations, motors with frequency converter control and differential protection of short cable and overhead lines. All applications include setting recommendations. Finally, the need for interposing CTs is discussed and illustrated with examples.
KEYWORDS: differential protection, power transformer protection, generator protection, motor protection, differential relay, SPCD 3D53, SPAD 346 C.
Industry Profile:
ABB invented and manufactured many products and technologies, including the world’s first three-phase power transmission system, the world’s first self-cooling transformer, high-voltage direct current transmission technology and the first electric industrial robot, and pioneered their commercial application. ABB has a broad product line, including a full line of power transformers and distribution transformers, high, medium and low voltage switchgear products, AC and DC transmission and distribution systems, power automation systems, a variety of measuring equipment and sensors, real-time control and optimization systems, robotics hardware and software and simulation systems, energy efficient motors and driveline systems, power quality, conversion and synchronization systems, Fuse and switch equipment to protect the safety of power systems. These products have been widely used in industry, commerce, electricity and public utilities.
ABB is one of the World’s top 500 companies (256th in 2008, 230th in 2009 and 237th in 2010), with sales of US $32 billion from 2009 to 2011. It is listed on the Zurich, Stockholm and New York Stock exchanges.
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