Understanding and applying precision time protocol
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Precise time synchronization has become a critical component of modern power systems. There are several available methods for synchronizing the intelligent electronic devices (IEDs) in a power system. In recent years, there has been great interest in providing time to the IEDs using the same infrastructure through which the data are communicated. Precision Time Protocol (PTP) is a promising technology for achieving submicrosecond synchronization accuracy between IEDs over Ethernet. This paper presents the protocol fundamentals and discusses considerations for designing power system networks to achieve submicrosecond accuracies. Specific provisions made in the profile for power system applications to support IEC 61850 substation automation systems are also discussed.
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