Digital Substation Evolution in the Journey of Smart Grid


Emmoji Vundekari
Venkatesh Rokkam
Venkatesh Rokkam
Balakrishna Pamulaparthy
Balakrishna Pamulaparthy


IEC61850 as a globally accepted standard has paved the path for the realization of digital substations. A substation protection, automation, monitoring and control system based on the concepts of [EC61850 can be built faster, more efficiently, and more repeatably by replacing physical wiring with digital communications. This involves learning & understanding several parts of IEC61850 standard parts. [EC61850 standard parts consist of ten main parts with several other associated parts. While a utility decides to implement an “IEC61850 Digital substation”, the user must understand that to design such substation, the user not only has to understand the key terms, usage of standard but also what can be the potential benefits and what is the current trend in this space of digital substation. This paper presents architecture and evolution of the digital substation, present stage of implementation, at the same time potential benefits explained with some key case studies on protection, monitoring and control.


How to Cite
Vundekari, E., Rokkam, V., Rokkam, V., Pamulaparthy, B., & Pamulaparthy, B. (2020). Digital Substation Evolution in the Journey of Smart Grid. Power Research - A Journal of CPRI, 9–17.


  1. Yin Y, Gao J, Hosseinzadeh H, Su B, Hunt R. New insights into IEC61850 interoperability and implementation. Available from:
  2. Mackiewicz RE. Overview of IEC61850 and benefits. IEEE PES Power Systems Conference and Exposition; 2006.
  3. Richards S, Arnaud J. Digital substation, the next generation smart substation for the power grid. PAC World Conference; 2016 Jun.
  4. Hunt R. Process bus- A practical approach. PAC World Conference. Available from: doc/SpringIssue09/GE_Process_Bus_spring09.pdf
  5. IEC61850 9-2LE. Implementation guidelines for digital interface of instrument transformers using IEC61850 9-2. Available from: %20Guidelines/DigIF_spec_9-2LE_R2-1_040707-CB.pdf
  6. Hodder S, Hunt R, McGinn D, Kasztenny B, Adamiak M. The advantages of IEC61850 process bus over copper-based protection and control installations. Available from: Content/GE%20Digital%20Energy/Whitepapers/The%20 Advantages%20of%20IEC%2061850%20Process%20Bus%20 Over%20Copper-%20Based%20Protection%20and%20 Control%20Installations.pdf
  7. Teoh CP, Newman P, Lloyd G, Qin H, Hunt R, Mendez J, Smith T. A solution to eliminate conventional busbar protection with process bus. Available from: Process_Bus.pdf
  8. UR series communication guide- GE Publication GEK119629A. Available from:
  9. Hinkley, Mistry C. First digital substation? A journey, business case, lessons. PAC World Conference; 2018 Sep.
  10. Teoh CP, Newman P, Lloyd G, Qin H, Hunt R, Mendez J, Smith T. A solution to eliminate conventional busbar protection with process bus. Proceedings of the Relay Conference; College Station, TX, USA; 2019 Mar 25-28.
  11. Englert H, Flemming S, Bisale C, Ruff C, Rudd A. Design, concept, commissioning, maintenance, cyber security of a IEC61850 Process Bus Brown Field Application. CIGRE 2018; Paris.