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The authors suggest the concepts of protection relay systems for operation within a Smart Grid and describe the results of a prototype development. This paper introduces each of the system characteristics that should be considered for protection operation within Smart Grid, and the evaluation methods that were applied under both normal and faulted conditions. The results of a field trial in the 66kV...
The autoreclose function contained within protection relays can be applied to various EHV/HV network configurations and provides three main types: single-phase, three-phase and multi-phase.
In recent years, progress in the development of communication network technology has been very rapid and Ethernet can now be applied to provide the backbone for wide area communication networks. Within this framework a Next Generation Network (NGN) that fuses mobile and fixed communication service interfaces is considered for the integration of a variety of data traffic types. This type of technology...
A new numerical current differential relay that operates by digital communication over metallic pilot circuits has been developed, allowing utilities to re-use their existing pilot-wire protection signalling infrastructure while introducing the benefits of numerical relay technology. Sophisticated techniques were applied to achieve digital communication over metallic pilots without the use of modems...
Pilot-wire differential relays have a long track-record of providing effective and reliable protection for overhead lines and underground cables in many parts of the world. The conventional analogue or electromechanical types are, however, limited in that they cannot provide the high performance and advanced features which have become commonplace in modern digital protection systems. The authors have...
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