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Transient Signals and Their Processing in an Ultra High-Speed Directional Relay for EHV/UHV Transmission Line Protection

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4 Author(s)
Lanz, O.E. ; BROWN BOVERI & COMPANY LTD. DEPT. ESP ; Hanggli, M. ; Bacchini, G. ; Engler, F.

This article describes an ultra high- speed directional comparison relay (UHS relay) based on the evaluation of transient signals generated by the occurrence of a fault. The use of a replica impedance in the current circuit results in a pick-up sensitivity which is largely independent of source impedances. The discrimination between phases even in the case of long transmission lines is assured through the provision of a second measuring criterion.

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Power Apparatus and Systems, IEEE Transactions on  (Volume:PAS-104 ,  Issue: 6 )