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THE ERA OF GLOBAL STANDARD FOR SCADA SUBSTATION AUTOMATION TECHNICAL PAPER

Authored by: Hari Kumar Naidu and K.Thanushkodi

ABSTRACT-The IT revolution has encompassed within its realm the electrical power sectorby the application of Intelligence in Metering, Protection, Monitoring andControl.The amalgamation of communication and IT has made it possible for aReal time IT systems to monitor and control, from a central place, by SCADAfor the operation of Power Generation, Transmission and Distribution.A hierarchical structure exists in the transmission and distribution ofpower since the power is received at a high voltage level in a substation anddelivered to a load center through another substation at reduced voltage level.These substations are being transformed from hardwired configurations to anetworked platform by leveraging the technological advancements. Thetechnological transformations have brought within its purview ComprehensiveAutomation of Substation.This paper brings out the current trend in communication & systems inSubstation Automation IEC61850 Standard along with its benefits forimproving Quality and Reliability of the Power System. Also, this paperhighlights the case study of a real time process control scheme.

INTRODUCTION - Substation equipments generally are categorized into two domains primaryequipments and secondary equipments. Primary equipments include transformer,switchgear etc, while the secondary equipments include protection, control andcommunication equipments.Levels of Sub-Station Automation: Sub-station Automation systems comprise threelevelsThe station level: It consists of the station computer with a database, operator’sworkplace, and interfaces for remote communication etc. Station Level functions referto the substation as a whole.There are two classes of station level functions namely the process related stationlevel function and the interface related station level function.The Process related functions act on the data from multiple bays or substationlevel database. These functions are used to submit the control commands for theprimary equipment (Circuit breakers) and collect the substation data like voltage,current, power factor etc. from the bay level devices. As described above, each bayincludes one primary equipment such as transformers, feeders etc. Interface relatedfunctions enable interactive interface of the substation automation system to the localstation operator HMI (Human Machine Interface), to a remote control centre or to theremote monitoring centre for monitoring and maintenance.

CONCLUSION - The scope of IEC 61850 covers design, implementation of digital substation that canbe expanded and augmented with additional functions. In addition, applications are inservice that uses various components of IEC 61850 for wide area substation tosubstation communication. Customer’s network model database undergoes constantnetwork topology changes throughout the life of the system. The changes are due tothe natural evolution of the physical power system. In such a scenario IEC 61850Standard can be implemented successfully for distribution automation application infuture.


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