Resilience Architecture Framework

The SGAMS Infrastructure Resilience Framework addresses four dimensions: physical redundancy design, communication fault tolerance, cybersecurity zonation, and operational continuity procedures. These dimensions interact — a resilient physical design can be compromised by a poorly segmented communication network, and a well-segmented network can be neutralized by inadequate operational procedures.

Fault Tolerance Design

Fault tolerance in grid infrastructure requires protection relay coordination, communication path redundancy, and SCADA failover architecture. Protection relay coordination is the most technically demanding: incorrect settings cause nuisance trips, while under-conservative settings allow fault propagation. The SGAMS relay coordination framework covers distance, differential, and overcurrent protection scheme design for transmission and distribution environments.

Communication path redundancy for critical control functions must meet IEC 61850 GOOSE timing requirements — typically sub-4ms for protection-class messaging. This constrains network architecture choices.

Cybersecurity Architecture — IEC 62443

Critical infrastructure cybersecurity requires IEC 62443 security zone and conduit architecture. The fundamental difference from enterprise IT security is operational: industrial networks have defined latency requirements, change-control constraints, and operational availability requirements that standard IT security measures may violate.

The SGAMS IEC 62443 implementation framework defines security levels (SL1-SL4) by operational zone, conduit specifications between zones, and the device-level security requirements for components that span zone boundaries. See our OT Security field note for the zone architecture methodology.

Operational Continuity Planning

Resilience is not fully realized until operational teams have procedures for the failure scenarios the architecture was designed to handle. The SGAMS operational continuity framework covers emergency operating procedures, system restoration sequencing, and communication protocols for major incident response in grid and industrial environments.

The Nordic Grid Modernization case study documents resilience improvements achieved through SCADA replacement and protection system upgrades. The Smart City Grid Resilience case study covers multi-source DER management under fault conditions.