Protocol Expertise
Production-deployed protocol implementations across protection, industrial networking, and building automation systems.
IEC 61850 GOOSE
IEC 61850-8-1
Peer-to-peer publish/subscribe messaging for protection interlocking, trip commands, load shedding, and zone-selective interlocking. Our primary design standard for distributed control architecture.
1–3 ms end-to-end GOOSE latency (IEC 61850-5 Performance Class P2/P3, Type 1A ≤3 ms)
134 IEDs per complex design across 8 manufacturer platforms
3-continent deployment (Goldstone CA, Madrid Spain, Canberra Australia)
Zone-selective interlocking (ZSI) deployed via GOOSE across 5× SEL-751 and 3× SEL-751A relays at GDSCC — coordinated fault clearing without central controller dependency.
GOOSE publish/subscribe configuration across SEL-751, SEL-700G, and RTAC-3530 platforms at all three DSN complexes (Goldstone, Madrid, Canberra).
SCL/CID/SCD file management using AcSELerator Architect — baseline version control for relay and network configurations across 134 IEDs per complex.
Protocol gatewaying via SEL RTAC-3530 for integration with non-IEC 61850 devices (Modbus, DNP3 legacy equipment).
IEC 61850 MMS
IEC 61850-8-1 (MMS mapping)
Client/server data modeling and supervisory access for IEC 61850 devices — the configuration, monitoring, and reporting counterpart to GOOSE's real-time messaging.
134 IEDs per complex accessible via MMS data models
Supervisory layer across 8 manufacturer platforms
MMS-based supervisory access to IEC 61850 IEDs at all three DSN complexes for configuration management, event reporting, and SCADA integration.
RTAC-3530 gateways provide MMS client connectivity to SEL relays, exposing IEC 61850 data models to upstream monitoring systems.
PRP (Parallel Redundancy Protocol)
IEC 62439-3
Zero-switchover-time network redundancy for mission-critical protection and control messaging. Dual-star topology ensures no single network failure disrupts protection coordination.
0 ms failover — seamless redundancy with no switchover delay
2× Catalyst 9500 core + 24× IE-2000 edge per complex
3-continent deployment with identical topology
Designed PRP dual-star station network: 2× Cisco Catalyst 9500 distribution switches and 24× Cisco IE-2000 industrial edge switches per complex — independent LAN-A/LAN-B planes with no cross-plane bridging.
All critical IEDs dual-attached as DANP (Doubly Attached Node with PRP) to distinct edge switches, with redundant uplinks to both distribution cores.
Deployed across all three DSN complexes — same architecture replicated at Goldstone, Madrid, and Canberra for consistent protection behavior.
Modbus TCP / RTU
Device-level communication for control, status, metering, and UPS integration across multi-vendor environments. TCP for networked devices, RTU for serial field equipment.
8 manufacturer platforms integrated via Modbus
134 IEDs per complex with Modbus as secondary control path
Multi-vendor Modbus integration across SEL relays, Woodward easYgen 3400 and LS-6 controllers, CAT EMCP generator controllers, EIG Shark-250 and Eaton Power Xpert metering, and UPS systems.
Modbus TCP for networked device control and metering aggregation. Modbus RTU for serial device integration including genset controllers and legacy serial meters.
Deployed at all DSN sites for non-critical control and metering — complementing IEC 61850 GOOSE for the critical protection layer.
Production-Deployed Protocols
Protocols with operational deployment evidence from data center programs.
DNP3 IEEE 1815
SCADA and legacy system integration protocol. Serves as the bridge between modern IEC 61850 protection networks and existing facility monitoring infrastructure.
Evidence: Deployed at all DSN sites for SCADA connectivity and legacy cross-system integration via SEL RTAC-3530 protocol gatewaying.
IRIG-B
GPS-synchronized precision timing for protection relay coordination and sub-millisecond sequence-of-events recording. Essential for post-fault analysis and regulatory compliance.
Evidence: GPS-based IRIG-B distribution from centralized receiver to all protection relays and RTACs at MDSCC — purpose-built for MV switchgear upgrade commissioning.
≤1 ms sequence-of-events resolution
SNMP
Network infrastructure health monitoring and telemetry for industrial switches and managed network equipment. Part of the observability layer alongside SCADA.
Evidence: Monitoring Cisco Catalyst 9500 distribution and IE-2000 industrial edge switches across all DSN sites — link status, device health, and performance telemetry feeding network management systems.
BACnet/IP ASHRAE 135
Building management system integration for coordinated power-and-cooling control. BACnet/IP for network backbone, BACnet MS/TP for field controllers.
Evidence: Automated Logic (ALC) WebCTRL BMS integration at GDSCC — BACnet/IP segmentation and routing with BBMD broadcast management across subnets, redundant pump controls with lead/lag auto-changeover on fault.
BACnet MS/TP ASHRAE 135
Field controller communication for HVAC and building automation equipment on serial bus networks.
Integration & Bridging Protocols
Protocols used for cross-system connectivity, legacy bridging, and northbound data exchange.
Looking for side-by-side protocol comparisons? View protocol comparisons →
The projects described were performed by personnel prior to the formation of Ziggurat Automation Inc. while employed by previous organizations. They are presented solely to illustrate the team's individual experience and competencies.
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Multi-vendor integration, legacy bridging, or greenfield IEC 61850 —
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