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Research on equivalent contact reactance X con setting calculation for generator out-of-step protection--discuss with Guide of Calculating Settings of Relay Protection for Large Generator and Transformer
Author(s): 
Pages: 97-102
Year: Issue:  7
Journal: Relay

Keyword:  out-of-step protectiongenerator out-of-step protectioncontact reactancesystem reactance;
Abstract: The calculation formula of equivalent reactance Xcon between generator and infinite system for generator out-of-step protection in the current"Guide of Calculating Settings of Relay Protection for Large Generator and Transformer"is improper, it is questionable. This paper has researched this problem deeply and obtained the correct method of the Xcon setting calculation for generator out-of-step protection, and compared the X con values calculated by the proposed calculation method and the"guidelines"calculation method in the same oscillation of the system condition, the results show that the"guidelines"setting calculation method may lead to the out-of-step protection maloperation, and the proposed setting calculation method can ensure the out-of-step protection reliable operation.
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