Research of the Electronic Protection Technology to Improve the Reliability for the Stability Operation in the Substation
The zero order current protection,the differential transformer protection and the electronic protection are introduced in this paper with their principles analyzed and contrasted.It is verified that the differential protection composed with electronic current transformers has the advantage of small error of signal transmission,reliable protection action and high correct rate.It shows that the conventional substation of obsolescence protection mode is changed by the technology of electronic transformer protection and fiber optic communication network used in the digital substation.The new technology improves the accuracy of the digitized substation protection action significantly.It provide reliability for the stability operation of Shanghai Power Grid.
Electronic transformerZero order protectionDifferential transformer protectionDigital loop network communication
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