Time Synchronisation with PTP: Getting IEC 61850 Timing Right A few winters ago, we were called into a UK digital substation where protection engineers were chasing ghost trips. The relay logic was sound, the GOOSE configuration had been validated in the lab, and yet during switching operations the scheme occasionally misbehaved. The culprit turned out…
SCL Files: ICD, SCD and CID Demystified A junior engineer joins a UK digital substation project on a Monday morning, opens the project folder, and finds a bewildering collection of files: .icd, .scd, .cid, plus a few XML variants nobody has explained yet. The senior engineer says “just load the CID into the relay” and…
Sampled Values and the Process Bus: The Backbone of Digital Substations Walk into a UK primary substation built in the 1980s and you will still see it: hundreds of metres of copper multicore cable, every current transformer and voltage transformer hard-wired back to a relay panel. Now picture a modern digital substation in the same…
Migrating a Legacy Substation to IEC 61850: What We Learned Most UK legacy substations were never designed for the digital substation era, yet they still form the backbone of our grid. The control panels we inherited at sites commissioned in the 1970s and 1980s were built around electromechanical relays, hardwired trip circuits and a design…
Interoperability Testing Between Vendors: Making IEC 61850 Work in the Real World We were on site at a UK digital substation project a few years ago when the commissioning engineer called us over with a look we’ve seen too many times. A protection IED from one major vendor simply would not exchange GOOSE messages with…
IEC 61850 for Distributed Energy Resources: What UK Utilities Need to Know The UK’s renewable energy boom is changing the shape of the grid faster than most network operators anticipated. Where electricity once flowed predictably from large centralised power stations down to homes and businesses, it now moves in multiple directions — from rooftop solar…
IEC 61850 Explained for Newcomers: Your Plain-English Guide We still remember the first time we opened an IEC 61850 manual. Within ten minutes we were drowning in acronyms — logical nodes, SCL schemas, MMS stacks — and wondering whether anyone actually spoke this language fluently. If that sounds familiar, take a breath. The standard is…
GOOSE Messaging: How It Works At a digital substation in the north of England, a phase-to-earth fault appears on a 132 kV feeder. Before the protection engineer’s coffee has settled in the cup, a trip signal has already left the relay, crossed the station bus, and arrived at the circuit breaker — total elapsed time,…
Digital Substations: Benefits and Challenges The UK’s legally binding net zero targets are forcing a fundamental rethink of how we run the electricity network. With offshore wind, distributed solar and electric vehicles reshaping demand patterns, the substations built around copper wiring and electromechanical relays are starting to look like relics. Digital substations, built on the…
Cyber Security for IEC 61850 Networks: Protecting the UK’s Smart Grid When a ransomware attack forced a major UK energy supplier to shut down its customer-facing IT systems in 2023, it was a reminder that the energy sector is now a frontline target. But while headlines focus on billing systems and corporate networks, a quieter…