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Signal Processing for High Impedance Differential Protection Schemes

High Impedance differential protections (87Z) schemes for bus and transformer Restricted Earth Fault (REF) applications are common in the industry because of their security, dependability, and simplicity. 87Z schemes consist of a dedicated set of CTs, one per terminal, with all the secondary winding...

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Published in:	IEEE transactions on industry applications 2024-09, Vol.60 (5), p.7702-7710
Main Authors:	Tourn, Daniel Humberto, Florena, Edgardo, Zamanillo, German, Donolo, Pablo Daniel, Dissanayake, Anushka, Kulkarni, Pallavi, Hartshorn, Jay, Donolo, Marcos
Format:	Article
Language:	English
Subjects:	Bus bar protection Circuit faults Fault currents high impedance differential protection Impedance phasor generation Protection Relays Resistors Signal processing
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creator	Tourn, Daniel Humberto Florena, Edgardo Zamanillo, German Donolo, Pablo Daniel Dissanayake, Anushka Kulkarni, Pallavi Hartshorn, Jay Donolo, Marcos
description	High Impedance differential protections (87Z) schemes for bus and transformer Restricted Earth Fault (REF) applications are common in the industry because of their security, dependability, and simplicity. 87Z schemes consist of a dedicated set of CTs, one per terminal, with all the secondary windings connected in parallel and terminated at a resistor, referred to as a stabilizing resistor, and MOVs. The interaction of these components results in voltage and current signals that deviate from typical power systems signals. In this paper, we present data from testing at a 2 MVA test facility and draw conclusions from the effect of these distortions on the signal processing of protective relays. We show that these effects are limited to a narrow range of fault currents. We also present signal processing and logic for the 87Z scheme that is secure and dependable.
doi_str_mv	10.1109/TIA.2024.3427051
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subjects	Bus bar protection Circuit faults Fault currents high impedance differential protection Impedance phasor generation Protection Relays Resistors Signal processing
title	Signal Processing for High Impedance Differential Protection Schemes
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