Considerations for using high-impedance or low-impedance relays for bus differential protection

Two drastically different types of differential relays, one with a single set of very high-impedance inputs and another with multiple sets of low-impedance inputs, are available for bus differential protection. Protection engineers often question which type to choose for their bus protection applica...

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Main Authors: Behrendt, Ken, Costello, David, Zocholl, Stanley E
Format: Conference Proceeding
Language:English
Subjects:
Circuit faults
Current transformers
Fault currents
Fault detection
Laboratories
Monitoring
Power system protection
Power system relaying
Protective relaying
Relays
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creator Behrendt, Ken
Costello, David
Zocholl, Stanley E
description Two drastically different types of differential relays, one with a single set of very high-impedance inputs and another with multiple sets of low-impedance inputs, are available for bus differential protection. Protection engineers often question which type to choose for their bus protection applications. This paper discusses for each type of relay the concepts used, the pros and cons, and the importance that current transformer selection plays in applications.
doi_str_mv 10.1109/CPRE.2010.5469509
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source IEEE Electronic Library (IEL) Conference Proceedings
subjects Circuit faults
Current transformers
Fault currents
Fault detection
Laboratories
Monitoring
Power system protection
Power system relaying
Protective relaying
Relays
title Considerations for using high-impedance or low-impedance relays for bus differential protection
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