Abstract
Line differential protection features great selectivity to isolate equipment under fault conditions. However, this technique has been limited by factors such as transmission line length, communication network delay, use of proprietary protocols, or vulnerability to network failures. The IEC 61850 standard enables the implementation of digital substations, which have proven to be a good option for improving the reliability and efficiency of the electrical system. In this sense, we propose a new scheme for differential protection in transmission lines using SV messages by the IEC 61850 standard. In addition, we carry out a feasibility for differential protection in two 500 kV transmission lines of the Brazilian interconnected system using the Aspen Oneliner software. We evaluate the communication performance of the proposal in a testbed with two SEL 421–7 protection relays capable of sending and receiving SV messages, an Omicron CMC 356 test case, a PTP signal distributor device SEL-2488, an SEL-9524/GNSS antenna, switches for proper formation of communication buses, and hardware to emulate the length of the transmission line communication channel, generate concurrent traffic injection, and also induce package loss scenarios for the SV messages. The results are promising and indicate the viability of the proposal.© 2017 Elsevier Inc. All rights reserved.
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