Thursday, January 19, 2012

Difference between SCADA and SAS (Substation Automation System)





Nowadays, the substations are a mix between legacy and modern devices and technologies. There is a powerful requirement for remote management, tele-control, and protocols and interfaces standardization between different modules. Luxoft is presenting development services of software around testing and modeling tools, configuration of substation network devices and software of diagnostic, developing and testing systems SCADA. This assists vendors on Substation automation to build the complete environment to make Smart Substations of the highest level, reducing costs of operational and maintenance.

An efficient system of SCADA is a vital part of efficient power management, and its development is a business critical job. Luxoft is able to help any vendor on the market to modernize and redesign their system of SCADA and establish new functionality.

The initial SAS (Substation Automation Systems) characteristically had architecture of master slave in a topology of star and used specific vendor proprietary protocols within the Substation and to a NCC (Network Control Centre) or System of SCADA.

Because of the non-interoperability of data modeling and communication, substation incorporation was very risky and complicated. Consequently the user was frequently bounce to one vendor. The protocol converters usage was quite often important.

The architecture of master-slave itself formed some extra system immanent constraints:
• Station-wide functionality of automation is placed in the master.
• Master characterizes as the bottleneck.
• Communication between slave and master is not event driven.
• No straight communication between 2 slaves.

The equipment of communication, hardware, and the HMI (Human Machine Interface) were frequently from one supplier and hence development was limited. This led to constraints in performance, functionality, and participation in improvements. The interlocking of switchgear was primarily performed by a divide autonomous system, which was connected in parallel to the units of I/O. The SAS configuration was carried out offline with a PC or Workstation and after that either loaded the program into EPROMS or straight loaded into the I/0 or master units.


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