The IEC 61850 System Configuration Tool built at the panel
Engineer, validate, document, simulate, monitor and commission IEC 61850 substations in one Windows tool. Built by Derek Ward out of real multi-vendor projects, and used daily on a live switchgear upgrade and at a FAT bench.
Two jobs, one tool
Most teams use one tool to engineer the SCL files and another to test the live devices, and share one or two expensive licences between everyone. Limelight SCT does both, so each engineer can have their own.
SCL engineering
- Import and export SCD, CID, ICD and IID files
- IEC 61850 Edition 1 to Edition 2.2, with edition-targeted export and mixed-edition merge
- Round-trips files byte for byte, keeping vendor private data intact
- Editors for datasets, report / GOOSE / SV control blocks, communication addresses and GOOSE / SV subscriptions
- Undo / redo, autosave and an audit log
Live diagnostics and commissioning
- IEC 61850 client: browse, read, write, reports and controls (test mode on by default)
- Compare a live device against the project
- Network sweep to find IEDs
- "Verify all IEDs" with a printable evidence report and relay clock check
- Watchlist with trends; GOOSE and Sampled Values monitors that show who hears whom
Validation before export
47 rules across naming, references, communication, capacity, datasets, control blocks and subscriptions, plus checks against the official IEC schemas. A pre-export check stops a broken file leaving your desk.
Change management at scale
Semantic SCD diff, an Excel round-trip for addresses, datasets and subscriptions, bay replication, automatic IP assignment, and a lean SCD export for tools with file-size limits.
Handover documents
An as-built HTML handover document with sign-off, and evidence reports for FAT and site acceptance.
A virtual substation
Limelight SCT can serve every IED in an SCD as a live IEC 61850 server on your network. Force signals, run signal generators, operate controls that honour each device's control model and test mode, switch setting groups, and publish GOOSE and Sampled Values.
Use it to test a SCADA or gateway configuration before the panels arrive, or to run a FAT without every relay on the bench.
Training HMI Preview
A browser-based live single-line diagram for each bay, driven by the simulator. Students open and close breakers and disconnectors with the bay interlocking in force, while a real SCADA system, such as MicroSCADA, connects to the same virtual relays.
A look inside
Screens from a demo project with five ABB relays. Tap any image to see it full size.
Proven with real devices
Output checked in vendor tools
Tested on live hardware
A relay clock six years out
Found by Limelight SCT on a live project.
416 missing GOOSE subscriptions
Across four bays of one real project SCD, found by Limelight SCT.
Built for OT networks
Fully offline licensing
A signed licence file, no activation server and nothing that phones home. It works on air-gapped substation networks.
Safety first
Controls default to test mode, and project changes are recorded in an audit log.
No lock-in
Supports IEC 61850 across vendors, and keeps each vendor's private data in your files untouched.
Windows, 64-bit. Installs from a self-contained installer; no separate .NET install needed. Limelight SCT supports IEC 61850 Editions 1 to 2.2.
Try it on your own project
Evaluation licences run for 45 days. We start with a short guided session so you get value from it quickly, even on a busy project.