Line Protection Subcommittee


Investigate and report on the relaying techniques and systems used for transmission and distribution (T&D) line protection. Develop statistics and recommend protection practices for improving line relaying performance. Develop and maintain standards for line protection.

Chair: Karl Zimmerman

Vice Chair: Bruce Mackie

Working Groups

WGNameChairVice ChairScope
D28(PC37.230): Guide for Protective Relay Applications to Distribution LinesBrian BoysenClaire PattiTo review and revise C37.230-2007, “Guide for Protective Relay Applications to Distribution Lines” to correct errors and address additional distribution line protection related topics.
D29Tutorial on Setting Impedance-Based Power Swing Blocking and Out-Of-Step Tripping Functions on Transmission LinesKevin JonesNormann FischerCreate a tutorial on setting impedance-based power swing blocking and out-of-step tripping functions related to transmission line applications. Specific relay settings examples will be provided. Other methods of detecting out-of-step conditions that exist will be summarized and referenced, but will not be discussed in detail.
D30Tutorial on Application and Setting of Ground Distance Elements on Transmission LinesKarl ZimmermanTed WarrenWrite a tutorial on factors affecting the application and setting of ground mho and quadrilateral distance elements on transmission lines.
D34Coordinate with IEC 60255-187-3 Functional Specification for Line Current DifferentialNormann FischerJoe Mooney
D35Evaluation of Transmission Line Pilot Protection SchemesRick GambleNathan GulczynskiPrepare a technical report to the line protection subcommittee to evaluate advantages and disadvantages of common transmission line pilot protection schemes, including POTT, DCB, DCUB, and line current differential. The schemes will be evaluated in terms of speed, sensitivity, dependability and security based on the design and configuration of transmission lines and system topology. A limited number of example systems will be evaluated.
D37Impact of Series Compensation on Transmission LinesMike KockottLuis PolancoCreate a report the impact of series compensation on transmission lines.
D38Impact of High SIR on Distance RelayingChris WalkerGreg RyanInvestigate the need for a working group on the Impact of High SIR on Distance Relaying.
D39Revise C37.104 IEEE Guide for Automatic Reclosing of Circuit Breakers for AC Distribution and Transmission LinesManish PatelBrandon ArmstrongTo determine if a working group is needed to review C37.104 IEEE Guide for Automatic Reclosing of Circuit Breakers for AC Distribution and Transmission Lines
D40Manage the Development of Line Protection TopicsJeff BarschDon LukachManage the development of line protection topics and harmonize efforts with IEEE Std C37.113-2015, IEEE Guide for Protective Relay Applications to Transmission Lines.
D41Coordination of Activities Related to Line Protection Inverter-Based SourcesIlia VolohTBDMonitor and collect line protection events, coordinate with other industry activities, and provide recommendations to improve protection response when connected to inverter-based sources.

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