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Connection to Protection & Control Devices
Merging units and protection & control devices are usually connected through optical fibers based on IEC61850-9-2 protocol. When the IEC61850-9-2 protocol is adopted, it is compatible with both Ethernet communication and point-to-point communication. The point-to-point communication is usually applied to the protection and control devices, which have high requirements on real-time data sampling. The Ethernet network communication can be applied to bay control units and metering devices, which have less requirements on real-time data sampling. In point-to-point communication, it is much easier to use Manchester code than Ethernet technology.
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