Implementation of Transformer Static Differential Relay with Harmonic Blocking.

Document Type : Research Studies

Authors

1 Elect. & Cathodic prot. Dept. Arab Petroleum Pipelines Co. (SUMED) P.O.Box:158 El-Saray, Alexandria

2 Electrical & Comp.Control Eng. Dept. Arab Academy for Science & Technology & Maritime Transport P.O. Box 1029 Alexandria Egypt

Abstract

 In this paper a transformer static/electronic differential relay is implemented using second order active band-pass filters for detecting second harmonic ratio. Thus enabling a relay-blocking signal during transformer inrush current, also the relay allows for a fine adjustment of the differential characteristic curve to facilitate its use in variety of transformer ratings. 

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