Abstract
The intelligent substation realizes the digitization of information in the whole substation and thus time synchronization system becomes more and more important. This paper introduces time synchronization technology of intelligent substation and puts forward the principles for designing intelligent substation time synchronization system. According to some relay protection malfunction examples caused by time synchronization system fault, analyze the influence of time synchronization system fault to relay protection and correspondingly put forward some improving measures.
Highlights
Compared with the conventional transformer substation, there exist great changes in intelligent substation structure
This paper introduces time synchronization technology of intelligent substation and puts forward the principles for designing intelligent substation time synchronization system
According to the demand of intelligent substation, this paper introduces the intelligent substation time synchronization technology, puts forward the principle of time synchronization system
Summary
Compared with the conventional transformer substation, there exist great changes in intelligent substation structure. The intelligent substation secondary system commonly contains electronic transformer, merger unit (MU), switch, protection and monitor device, etc. The analog signal sampling of protection and monitor device is realized by proposed merger units instead of the device itself. These changes induce higher request to intelligent substation time synchronization system [1]. After using electronic instrument transformer, the data acquisition module of relay protection devices and other automation devices move forwards to merging units. The primary electric parameters of mutual inductor need the sampling of the front-end module and the processing of merging unit afterward. Afterwards, the paper analyzes a substation malfunction examples caused by time synchronization system fault and puts forward the corresponding solutions
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