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Title: Modeling the impact of GIC neutral blocking devices on distance protection relay operations for transmission lines

Abstract

Geomagnetic Induced Current (GIC) blocking devices typically include a capacitor on the neutral grounding path of wye-configured transformers. This type of GIC blocking device was designed as an effective countermeasure to prevent possible damages caused on the power grid by geomagnetic storms, and by the slow-varying component of a high-altitude electromagnetic pulse (HEMP). The insertion of a capacitor in the transformer neutral impedes the establishment of GICs in lines terminated with wye-connected transformer windings. With the presence of a capacitively grounded neutral, however, it becomes important to evaluate that no adverse effects are introduced in the general grid operations. In this context, this study investigates the impact of GIC neutral blocking devices on the functionality of distance protection relays for different values of transformer neutral blocking capacitors, and at different transmission line voltages. This study was conducted with a real-time simulation platform, and the simulations were performed by introducing a phase-to-ground fault at different line locations, and by measuring the apparent impedance at the protection relay location. Finally, the results indicated that, for typical values of capacitance considered for GIC neutral blocking devices, the distance protection relay model operates properly, without requiring a modification of the relay settings.

Authors:
 [1]; ORCiD logo [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1607236
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Electric Power Systems Research
Additional Journal Information:
Journal Volume: 180; Journal Issue: C; Journal ID: ISSN 0378-7796
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; distance protection relay; geomagnetic induced currents; neutral blocking device; transmission line; apparent impedance

Citation Formats

Piesciorovsky, Emilio C., and Tarditi, Alfonso G.. Modeling the impact of GIC neutral blocking devices on distance protection relay operations for transmission lines. United States: N. p., 2019. Web. https://doi.org/10.1016/j.epsr.2019.106135.
Piesciorovsky, Emilio C., & Tarditi, Alfonso G.. Modeling the impact of GIC neutral blocking devices on distance protection relay operations for transmission lines. United States. https://doi.org/10.1016/j.epsr.2019.106135
Piesciorovsky, Emilio C., and Tarditi, Alfonso G.. Mon . "Modeling the impact of GIC neutral blocking devices on distance protection relay operations for transmission lines". United States. https://doi.org/10.1016/j.epsr.2019.106135. https://www.osti.gov/servlets/purl/1607236.
@article{osti_1607236,
title = {Modeling the impact of GIC neutral blocking devices on distance protection relay operations for transmission lines},
author = {Piesciorovsky, Emilio C. and Tarditi, Alfonso G.},
abstractNote = {Geomagnetic Induced Current (GIC) blocking devices typically include a capacitor on the neutral grounding path of wye-configured transformers. This type of GIC blocking device was designed as an effective countermeasure to prevent possible damages caused on the power grid by geomagnetic storms, and by the slow-varying component of a high-altitude electromagnetic pulse (HEMP). The insertion of a capacitor in the transformer neutral impedes the establishment of GICs in lines terminated with wye-connected transformer windings. With the presence of a capacitively grounded neutral, however, it becomes important to evaluate that no adverse effects are introduced in the general grid operations. In this context, this study investigates the impact of GIC neutral blocking devices on the functionality of distance protection relays for different values of transformer neutral blocking capacitors, and at different transmission line voltages. This study was conducted with a real-time simulation platform, and the simulations were performed by introducing a phase-to-ground fault at different line locations, and by measuring the apparent impedance at the protection relay location. Finally, the results indicated that, for typical values of capacitance considered for GIC neutral blocking devices, the distance protection relay model operates properly, without requiring a modification of the relay settings.},
doi = {10.1016/j.epsr.2019.106135},
journal = {Electric Power Systems Research},
number = C,
volume = 180,
place = {United States},
year = {2019},
month = {12}
}

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