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 Type 1A trip, ≤3 ms)
134 IEDs per complex design
Designed for 3 continents; commissioned at two of the three complexes
Zone-selective interlocking (ZSI) deployed via GOOSE across SEL-751 and SEL-751A feeder protection relays — coordinated fault clearing without central controller dependency.
GOOSE publish/subscribe configured across SEL-751, SEL-700G, and RTAC-3530 platforms for all three DSN complexes and commissioned at two of the three complexes.
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 the IEC 61850 IEDs via RTAC gateways
MMS-based supervisory access to IEC 61850 IEDs, designed for all three DSN complexes and commissioned at two of the three, 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
Managed distribution core + industrial Ethernet edge per complex
Identical topology designed for 3 continents
Designed PRP dual-star station network: managed distribution switches and industrial Ethernet edge switches at each 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.
Designed for all three DSN complexes and commissioned at two of the three — same architecture replicated in each site's design 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.
Relays, genset controllers, meters and UPS 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.
Designed for all three DSN complexes and commissioned at two of the three for non-critical control and metering — complementing IEC 61850 GOOSE for the critical protection layer.
Production-Deployed Protocols
Protocols with operational deployment evidence from mission-critical power 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: Designed for all three DSN complexes and commissioned at two of the three 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 managed distribution and industrial Ethernet edge switches, designed for all three DSN complexes and commissioned at two of the three — 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.
Discuss Your Protocol Requirements
Multi-vendor integration, legacy bridging, or greenfield IEC 61850 —
we'll scope the protocol architecture that fits your program.