Furthermore it is necessary to consider magnetization effects, tap changer errors and further sources of errors.īecause of the necessary zero-sequence elimination, also residual currents inside the transformer will be eliminated, which further reduces the sensitivity in regard to line-to-earth faults. One main reason for this limited sensitivity is the square dependency of the differential current depending on the fault location on the winding, caused by the transformation between LV and HV side of the transformer. What is Restricted Earth Fault Protection and Why is it Necessary? For certain line-to-earth faults inside a transformer the transformer overall differential protection is not sensitive enough to detect them. Any translation of this document is done for local requirements, and in the event of a dispute between the English and a nonEnglish version, the English version of this note shall govern. OMICRON translates this application note from the source language English into a number of other languages. However, OMICRON does not assume responsibility for any inaccuracies which may be present.

We have done our best to ensure that the information given in this application note is useful, accurate and entirely reliable. The product information, specifications, and technical data embodied in this application note represent the technical status at the time of writing and are subject to change without prior notice. Reprinting, wholly or in part, is not permitted. Reproduction of any kind, for example, photocopying, microfilming, optical character recognition and/or storage in electronic data processing systems, requires the explicit consent of OMICRON. All rights including translation reserved. This application note is a publication of OMICRON. OMICRON electronics GmbH including all international branch offices is henceforth referred to as OMICRON. The user is responsible for every application that makes use of an OMICRON product.

Please use this note only in combination with the related product manual which contains several important safety instructions. 8 Characteristic Definition Tab.9ĭifferential Protection Function. 5 2.3 Advanced Differential Test Object Settings. Testing with OMICRON Advanced Differential. What is Restricted Earth Fault Protection and Why is it Necessary?. Testing of Restricted Earth Fault Protection with OMICRON Advanced Differential Author Daniel Wiesner | Date Related OMICRON Product CMC Test Sets Application Area Restricted Earth Fault relays, Advanced Differential Keywords Restricted Earth Fault, REF, Restricted Ground Fault, RGF, Differential Version v1.0 Document ID ANP_10011_ENU

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