Introduction to the History of Selective Protection

Author: Walter Schossig, Germany

Remote Control

It could be said that the dividing wall was the first "remote control" initiative implemented to protect operators switching potentially explosive oil circuit breakers. Through time mimic boards were introduced to stations - these were the precursors to the modern Human Machine Interface (HMI) now installed with station computers.

 

Figure 7 Mimic Diagram Symbols EW Amsterdam, 1908 (AEG)

The development of protection and substation automation systems had taken place in parallel however with the introduction of digital technology these two technologies began to converge.

The convergence started with the proprietary exchange of information between protection and substation control systems. The journey from "Interface Number 6" (i.e. the forerunner of today's standard IEC 60870-5-103) and IEC 61850 involved many individuals and significant effort on various international working committees. The latest implementation of PAC technology allows the exchange of power system information across political borders and geographical regions and permits the synchronization of electric power systems to form huge power grids.

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