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Review of SIR Calculations for Distance Protection and Considerations for Inverter-Based Resources

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posted on 2023-08-31, 04:15 authored by Ritwik ChowdhuryRitwik Chowdhury, Carolyn Sun, Douglas Taylor

Source-to-line Impedance Ratio (SIR) is a parameter used in the application of distance protection. IEEE Std C37.113-2015 (Line Protection Guide) presents a method to calculate SIR for three-phase faults and single-line-to-ground faults. This method has been incorporated into short-circuit programs and is used by practitioners. However, the method uses assumptions that produce erroneous results in systems with zero-sequence mutual coupling and in systems with inverter-based resources. This paper reviews the evolution of SIR calculations (methods) and advocates the use of newer and simpler SIR calculations that remain accurate for all distance protection applications.

History

Email Address of Submitting Author

ritwik_chowdhury@selinc.com

ORCID of Submitting Author

0000-0001-8413-9840

Submitting Author's Institution

Schweitzer Engineering Laboratories, Inc.

Submitting Author's Country

  • United States of America