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Substation automation requires 4 μs accuracy and high availability of the clock synchronization mechanism. The clock synchronization protocol IEEE1588 satisfies the accuracy requirement under normal operation, but a failure on a grandmaster clock causes a large time error on the slave due to transient response by feedback loop. The failure may also trigger another failure on another grandmaster clock...
This paper describes the experience from the world first installation of High Voltage substation with IEC 61850 Process Bus where IEEE 1588 Time Synchronization and dynamic multicast filtering have been used. The authors provide brief introduction to the concept of digital substation and process bus, then provide overview of IEEE 1588 standard for precise time synchronization and finally describe...
Synchronized measurement technology (SMT) has the potential of becoming the backbone these Intelligent Electronic Devices (EIDs). The major advantages of using SMT are that all measurement signals are attached with a high-accuracy time stamp. This PTP-BASED system is one of these systems and comprise three main technologies: a PTP slave LM3S8962 microcontroller, a floating point DSP (TMS320C6713)...
It requires accurate synchronization among the MCU, servo controllers and sensors in CNC systems for time stamping of data and motion control. This paper presents the design and implementation of time synchronization for CNC systems which employ switched Ethernet as its communication module. The method adopts the clock of switches as the master clock instead of that of MCU which usual is. To obtain...
In various CNC systems the MCU, servo controllers and sensors all need to be accurately synchronized for time stamping of data and motion control. This paper presents a time synchronization method for CNC systems based on switched Ehternet in which message delay variation through switches must be minimized or compensated to obtain accurate time synchronization. The method uses the switch as the time...
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