OSKER enabled the Power Grid Corporation to have real-time data acquisition and supervisory control, data processing, handling operator interactions and report generation in its transmission operations

The product
OSKER: Open SCADA kernel
Complete supervisory control and data acquisition (SCADA) solution

The client
Power Grid Corporation of India Ltd (PGCIL)

India's biggest transmission network owner

The Power Grid Corporation of India Limited (PGCIL) is India's prime transmission network owner

Project details
Area of work: Supervisory control and data acquisition (SCADA), energy management systems, master station, remote terminal units, power line carrier communication (PLCC)

Problem addressed: PGCIL's western region load despatch system (WRLDC) comprises the WRLDC at Mumbai, the state load despatch centre (SLDC) of the Gujarat Electricity Board at Jambua, the SLDC of the Madhya Pradesh State Electricity Board at Jabalpur, and the SLDC of the Maharashtra State Electricity Board at Kalwa.

The existing SCADA at Mumbai, Jabalpur and Jambua were based on PDP legacy systems supplied by ABB. These were to be replaced with state-of-the-art hardware, SCADA software and EMS functions. CMC's system also had to communicate with the Siemens-based R-30 system at Kalwa.

Solution implemented: CMC replaced the old PDP-11 systems with DEC Alpha 1200 servers, Pentium-based FES/NAS, DEC Alpha XP1000s for man-machine interfaces (MMIs) and with CMC's state-of-the-art SCADA software, OSKER.

Network EMS functions like state estimation, contingency analysis and optimal power flow were also implemented at both the WRLDC and at the SLDCs. CMC's system communicates with the Siemens-based R-30 system at Kalwa on an X.25 link. Data transfer between the WRLDC and the constituent SLDCs is over the inter-control centre communication protocol (ICCP). The communication media between the WRLDC and the respective SLDCs is PLCC.

Components
	Main resource servers in a hot standby mode on DEC Alpha 1200, DEC Unix
	Front-end server / network analysis server in hot standby mode on Pentium Proliant 400 with Compaq SCO Unix
	MMI on DEC Alpha workstation 500 au, Digital Compaq Unix
	CMC's SCADA software - OSKER
	Network analysis (NA) functions
	CMC Products - DAH, X.25 pads, etc
	Printers, peripherals and other accessories

WRLDC - architecture diagram

Benefits

	Three-level hierarchical SCADA system
	Online migration of WRLDC and two SLDC systems
	Connectivity to ABB proprietary Indactic-33 protocol-based RTUs (existing)
	Connectivity to Siemens proprietary RP-570 protocol-based RTUs (existing)
	First regional load dispatch centre in India to have a SCADA system