Abstract
This paper introduces a method to realize transformer differential protection. In a UHVDC transmission system, the converter transformer protection device adopts the dual configuration. Due to the lack of TA configuration, A set protection configuration of the converter protection device is complete, and B set protection configuration is incomplete.B set protection cannot achieve differential protection, zero sequence differential protection, winding differential protection and connection line differential protection. The two systems can not be completely duplex, which will affect the safe and stable operation of the converter and the daily operation and maintenance. In view of this phenomenon, this paper presents a new method to realize differential protection of converter transformer. The application of this method can solve B set problem of incomplete protection configuration. This method can be used for reference in field application.
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