Experimental Test Bed to Enable Realistic Evaluations for Direct Transfer Trip Relaying via Private Wireless LTE Communications

Emma Raszmann, Kumaraguru Prabakar, Barry Mather, Jim Li

Research output: NRELPresentation


Increasing penetration levels of inverter-based distributed energy resources (DERs) in distribution systems are creating challenges in system operation. Currently, wired or proprietary wireless communications are used by advanced distribution management systems (ADMS) to detect the state of the system and control the DERs for optimal operation. Wireless communications are an alternative solution that can enable connectivity between the dispersed assets used in distribution system applications. This paper demonstrates an experimental test bed to enable the realistic evaluation of communications system characteristics for direct transfer trip (DTT) relaying of a photovoltaic inverter system using a private 900-MHz spectrum wireless LTE network. Private LTE network communications can be deployed to many remote DERs and other grid-edge devices to prevent costly infrastructure upgrades across distribution systems. In addition, this paper provides a framework for evaluating the impact of signal strength and network traffic in communications systems. The results shown develop a better understanding of the best practices for using LTE communications systems across multiple utility applications, such as protective relaying, voltage regulation, and supervisory control and data acquisition system messages.
Original languageAmerican English
Number of pages14
StatePublished - 2020

Publication series

NamePresented at the 2020 IEEE International Smart Cities Conference, 28 September - 1 October 2020

NREL Publication Number

  • NREL/PR-5D00-77958


  • 900 MHz LTE network
  • direct transfer trip (DTT)
  • experimental test-bed
  • inverter protection
  • message prioritization
  • smart grid
  • wireless communication


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