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Traditionally, differential protections are used in a substation to protect important plants such as busbars and transformers. They are unit protection schemes which provide good selectivity and fast operating times, but do not provide backup capability. Backup protections are usually provided by overcurrent, under impedance or distance zone 2/zone 3 schemes. They are less discriminative, and because...
With the rapid development of smart grid, digital substation plays an important role to ensure reliability and security of power grid operation. The application of IEC61850 provides the communications standard for total information sharing within a substation. Based on this foundation, this paper analyzes the information from the entire substation's primary and secondary equipment and represents the...
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