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Importance of protection IEDs in IEC 61850-based substations has increased by enhancing performance of IEDs but local backup scheme in the substation is not considered important. In the existing local backup method, two protection IEDs are installed for one protection target. This method is useful for local backup of the IEDs. However, local backup at simultaneous fault of the protection IEDs is not performed in conventional substation because it has limitations on operational environment. However, IEC 61850-based substation improves operational environment with high speed communication network and high performance IEDs; and the simultaneous fault problem can be resolved by developing new devices and schemes. Therefore, this paper proposes a new local backup scheme for simultaneous faults of protection IEDs in an IEC 61850-based substation. The proposed backup scheme is configured as self-supervision-based monitoring, new improved local backup IED, and local backup scheme; and the proposed scheme is implemented and tested using IEC 61850 SISCO library on a laboratory test bed. [ABSTRACT FROM AUTHOR]

Abstract: In this paper, a new adaptive load encroachment prevention scheme based on steady-state security analysis and adaptive anti-encroachment zone (AEZ) is proposed. The new scheme identifies the vulnerable distance relays through real-time security analysis. Selected dual contingencies are included to reflect the influence from the “hidden failures” of protection systems. Effective measures are taken to improve the computational efficiency. The AEZ will be designed online to prevent the undesired tripping if the analysis shows that a distance relay may suffer the load encroachment for a particular scenario. To ensure the dependability of the protection system, the AEZ will be applied only when its introduction is necessary. The effectiveness of the new scheme can be verified through the test cases in this paper. [Copyright &y& Elsevier]

• This paper discusses the applications of smart meters for protection and monitoring of emerging active distribution systems in a smart grid environment. • A number of possible applications are suggested and each of the suggested application can eventually become a research project. • This paper is of seminal nature in the area of smart meters and once published, will get a lot of air. Emerging distribution systems are experiencing large proliferation of smart meters. However, many groups have expressed reluctance in implementing the idea of smart meters. Health hazard due to exposure to radio waves, fire risk, security and privacy of customer information are some of the concerns raised by the consumers. Another important concern is the increased expenses of the utility providers with limited benefits resulting from detailed cost-benefit-analysis. Existing applications of smart meters have not been able to justify the importance of it in some situations. As evidenced in many articles, world-wide roll-out projects and the implementations of smart meters have been hindered with obstacles many times. Therefore, this sluggish progress and growing negative concerns originate the requirement of enhancement of new applications of smart meters in areas such as protection and monitoring of emerging distribution system. Protection and monitoring of distribution systems are two major aspects that any distribution provider is always concerned of and interested to explore smart approaches for management of it. This paper is proposing some potential applications in protection and monitoring of distribution system by the means of smart meters. The underneath expectation is that it will facilitate the required justifications in order to promote the future smart metering projects. [ABSTRACT FROM AUTHOR]