Topic feed.
A new mechanism for validating SCL files is emerging in the IEC 61850 engineering process — OCL (Object Constraint Language), a language for formally describing constraints and rules for the objects of the information model. The technical specification IEC TS 61850-6-3, published in 2025, defines a format for machine-processable rules that software tools can import and apply to SCL automatically. XSD only answers the question «is the XML document well-formed?», whereas many requirements of the standard concern the relationships between the objects of the model. OCL makes it possible to move from checking the formal correctness of XML to the automated checking of engineering rules that previously had to be interpreted and controlled by hand.
Conventional CTs hardwired to two multifunction IEDs per 132 kV bay from different manufacturers, GOOSE in place of interlock wiring, a virtualized SCMS, and a standard drawing set that ships with every tender. The design has now supported the construction of 90 substations in Dubai.
A report from the tutorial of CIGRE study committee B5 at the 2026 Paris session. Three renowned experts — Alex Apostolov (PAC World / OMICRON), Ratan Das (Siemens Energy, convener of the IEEE C37.300 working group) and David MacDonald (GE Grid Automation, convener of CIGRE WG B5.84) — arranged their talks into a single historical sequence: process bus → centralised protection → virtualisation. The protection function turns into a software application, and the server into a computing platform that can be replaced without changing the protection algorithm.
In digital-substation projects most attention goes to GOOSE, SV, PTP and the network. But there is another important layer — MMS exchange and IEC 61850 reports, through which SCADA, HMI, gateways and monitoring systems receive telemetry from IEDs. In practice the problems here are deceptively simple: the MMS connection is up, the device is reachable, the client «sees» the server — yet data does not update, some signals disappear, events are duplicated, or the report control block does not activate at all. This article covers the sharpest problems with report control blocks (RptEna, ConfRev, a block already taken by another client, TrgOps, a DataSet mismatch, duplication from the buffer via entryID and too much faith in the SCL file) and a practical principle: cross-check the SCL file, the device's actual MMS model and a PCAP capture together.
On a digital substation, the end devices kept reporting a communication fault that just as suddenly cleared itself, and the cause stayed unclear — the alarm was a shared one. The only source of information was a pcap file about 11 minutes long — almost 186,000 GOOSE packets and more than 200 sources. A manual analysis in Wireshark at that scale would have taken hours. We show how, in a few minutes, the Tekvel Magic software turned the network capture into a structured Excel report of an unscheduled inspection.
Precise time is a mandatory part of a modern substation: it is needed for event recording and oscillography, for Sampled Values, for phasor measurements and for other applications. But relying on a local receiver alone is becoming increasingly dangerous: jamming, interference and spoofing turn a single satellite source into a systemic risk. An architecture built around an ePRTC (enhanced Primary Reference Time Clock) in the telecom network and a TDG (Time Distribution Gateway) on site offers a heterogeneous approach: one precise time comes «from the sky», another «via the ground». The article — what ePRTC and TDG are, how they fit IEC 61850-9-3 PTP, and why a single redundant GNSS receiver is not enough.
"Shall support IEC 61850" is too general a wording. We look at where to check IEC 61850 conformance certificates today, what a conformance certificate really confirms, how a registry of 1,650 test records is structured by editions and roles, the seven parameters to check in a certificate, and how conformance testing differs from interoperability testing — and how to phrase a requirement in a specification instead of a vague phrase about "standard support".
In a pcap from a digital substation attention usually goes to GOOSE, SV, MMS and PTP. But useful diagnostics often live lower — in the MAC addresses. The article explains what an OUI is and how MA-L, MA-M, MA-S and CID differ, how to guess a vendor from the first octets, why a shared Source MAC on two IEDs breaks MMS and triggers MAC flapping, and what a digital-substation engineer should check on a first pass over a pcap.
CIGRE's first dedicated framework for virtualised IEDs will not publish until Q1 2028 — but the vPAC pilots that have to align to it are being commissioned now. Its scope is already public, through the working group's Terms of Reference and a framework article refeatured in ELECTRA 345 (April 2026): what is mandatory, what is deliberately out of scope, and what every 2026 vPAC pilot should already be doing in response.
Interoperability testing of substation configuration tools (SCT and ICT) has evolved from a supplementary element of the first IOP in 2011 to the central axis of the entire test programme by 2024. At IOP 2019, only 10 out of 159 ICD files (6.28%) passed validation without errors.
CIGRE WG B5.69 published TB 949 — the most comprehensive survey of real-world IEC 61850 process bus deployments. 55 projects, 42 specialists from 29 organisations. Key findings and what they mean for your organisation.
The UCA IUG conformance registry documents 1,650 test records across three IEC 61850 editions. To read the numbers, you need to know the policy behind them: who sets the transition deadlines, when Edition 2-only testing ended, and why 2023 produced a record spike. This article traces the process.
On March 16, 2026, Cuba experienced its eighth major blackout in 25 months — and its second total grid collapse of March alone. The Ministry reported that no faults were detected in operating units at the time of collapse, pointing to a structural cascading failure driven by chronic generation deficit.