alexa An Improved Merging Unit Model for Substation Automation System Based on IEC61850
ISSN ONLINE(2278-8875) PRINT (2320-3765)

International Journal of Advanced Research in Electrical, Electronics and Instrumentation Engineering
Open Access

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Research Article

An Improved Merging Unit Model for Substation Automation System Based on IEC61850

J.P.I. Iloh1, C.B. Mbachu2 and G.O. Uzhede3
  1. Ph.D. Student, Dept. of Electrical/Electronic Engineering, Anambra State University, Uli, Nigeria
  2. Lecturer, Dept. of Electrical/Electronic Engineering, Anambra State University, Uli, Nigeria
  3. Lecturer, Dept. of Electrical/Electronic Engineering, Federal University of Petroleum Resources, Effurun, Nigeria
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The implementation of the IEC61850-9-2 standard in substation automation systems requires the use of merging units for elimination of several multiple wire connections running from the switchyard to the microprocessor relays located in the control room. The conventional merging unit model collects current and voltage signals from various current and voltage transformers in the switchyard, converts them into digital form and sends the digital equivalents to the microprocessor relays via a single fiber optic cable known as the process bus. In this paper, we proposed a new merging unit model with additional features of in-built overcurrent protection and bay control functions. This new model is intended to provide local over-current protection and bay control for all equipments in the bay being monitored by a particular merging unit.


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