TITLE:
Solution Scheme for Time Synchronization of Current Differential Protection between Digital Substations
AUTHORS:
Bin Duan, Yao Wu
KEYWORDS:
Differential Protection; Time Synchronization; GPS; IEEE1588
JOURNAL NAME:
Energy and Power Engineering,
Vol.5 No.4B,
October
22,
2013
ABSTRACT: In digital substations with power transformers, the key to implementation of line differential protection is synchronization of electrical
quantities at both two sides. System framework of current differential
protection for lines between digital substations is analyzed briefly, as well
as the necessity of demand for time synchronization. Principle of time synchronization
based on GPS and IEEE1588 PTP (Precision Time Protocol) are introduced. Time
synchronization of current differential protection between digital substations
based on IEC61850 is discussed. This paper puts forward two solution schemes of
time synchronization, analyzes their advantages and disadvantages respectively,
and points out that the development direction of time synchronization of differential
protection between digital substations is IEEE1588 PTP.