OMICRON CMC 256plus Relay Protection Test System

Overview

The OMICRON CMC 256plus is a high-precision, modular relay protection test system engineered for comprehensive functional verification, commissioning, maintenance, and calibration of protective relays and associated measurement devices in utility, industrial, and transmission network environments. Based on the proven architecture of OMICRON’s CMC series, the 256plus integrates synchronized voltage and current source modules with real-time digital signal generation, enabling full-cycle, phase-resolved testing of electromechanical, static, numerical, and IEC 61850–compliant Intelligent Electronic Devices (IEDs). Its core measurement principle relies on digitally synthesized, low-distortion sinusoidal and transient waveforms generated via high-resolution DACs (16-bit minimum), with closed-loop feedback control ensuring amplitude stability and phase coherence across the entire output range. Designed for metrological-grade applications, it supports calibration traceability to national standards for energy meters, transducers, power quality analyzers, and synchrophasor measurement units (PMUs) compliant with IEEE C37.118.1–2014 and C37.118.2–2016.

Key Features

• Unified hardware platform combining relay testing, transducer calibration, and PMU validation—eliminating need for multiple dedicated instruments
• Simultaneous six-phase voltage (0–300 V_RMS) and six-phase current (0–32 A_RMS) outputs with independent amplitude, phase, and frequency control
• Reference-grade accuracy up to class 0.2 per IEC 61000-4-30 Annex B and IEC 62053-22, verified across full dynamic range—not only at nominal points
• Integrated GPS and IRIG-B time synchronization inputs supporting end-to-end latency measurement with <1 µs typical uncertainty, essential for IEC 61850-9-2 LE and IEEE C37.118 compliance testing
• Native support for IEC 61850 GOOSE and Sampled Values (SV) simulation and analysis—including configurable dataset mapping, timestamping, and quality flag manipulation
• Self-contained reference source architecture: no external calibration standard required during routine testing or factory acceptance tests (FAT)
• Robust mechanical design certified to IEC 61010-1 CAT III 300 V; reinforced chassis with integrated cooling, shock-absorbing feet, and IP2X-rated rear panel layout
• Automatic self-diagnostic routines executed at power-up and runtime, including amplifier health monitoring, isolation resistance checks, and thermal profiling

Sample Compatibility & Compliance

The CMC 256plus is validated for testing all major relay generations—including legacy electromagnetic units, solid-state analog relays, microprocessor-based digital relays, and modern IEC 61850–enabled IEDs from Siemens, GE, SEL, ABB, Schneider Electric, and Hitachi Energy. It fully complies with international standards governing safety, electromagnetic compatibility, and functional testing: IEC 61000-4-2/3/4/5/6 (EMC immunity), IEC 61010-1 (electrical safety), IEC 60255-24 (harmonic testing), IEC 60255-118-1 (synchrophasor performance), and IEEE C37.118.1–2014/2022. For metrological applications, its output uncertainty budget meets requirements for secondary calibration laboratories operating under ISO/IEC 17025, and its audit trail functionality aligns with FDA 21 CFR Part 11 and EU Annex 11 expectations for electronic records in regulated environments.

Software & Data Management

OMICRON Test Universe serves as the primary software interface, providing a unified environment for test plan creation, automated sequence execution, result evaluation, and report generation. The platform supports scripting in Python and Lua for custom test logic, integrates with enterprise asset management (EAM) systems via OPC UA, and maintains full GLP/GMP-compliant audit trails—including user authentication, parameter change history, and timestamped test logs. All test configurations and results are stored in an encrypted SQLite database with optional export to CSV, PDF, or XML formats compliant with IEC 61850 Substation Configuration Language (SCL). Firmware updates are delivered via secure HTTPS channels and validated using SHA-256 signatures prior to installation.

Applications

• Functional verification of overcurrent, distance, differential, transformer, busbar, and motor protection schemes
• Commissioning and periodic maintenance of substation automation systems per IEC 61850 engineering workflows
• Type testing and R&D validation of new relay designs under extreme fault conditions (e.g., CT saturation, DC offset, harmonic injection)
• Calibration of revenue-grade electricity meters (IEC 62053-21/22), analog transducers (IEC 60688), and PQ analyzers (IEC 61000-4-30 Class A)
• End-to-end latency and time-synchronization validation for PMUs, merging units, and process bus architectures
• Arc-flash protection system testing using optional ARC 256x initiator with synchronized optical trigger and current/voltage waveform capture

FAQ

Is the CMC 256plus suitable for IEC 61850 GOOSE interoperability testing?

Yes—it supports full GOOSE publisher/subscriber simulation, message integrity checking, and configurable GOOSE dataset structures aligned with IEC 61850-8-1.
Can it perform automatic relay trip time measurements with microsecond resolution?

Yes—using built-in high-speed digital inputs (1 MHz sampling) synchronized to the internal clock or external IRIG-B/GPS, enabling trip time measurement with ±1 µs typical uncertainty.
Does the system support third-party SCADA or DCS integration?

Yes—via OPC UA server mode, Modbus TCP, or custom RESTful API extensions developed using the OMICRON SDK.
What safety certifications apply to field use in substations?

It carries CE marking, complies with IEC 61010-1 CAT III 300 V, and meets EN 50121-4 for railway applications—making it suitable for live-panel testing under strict utility safety protocols.
How is firmware updated and validated for regulatory compliance?

Updates are cryptographically signed, installed through Test Universe with rollback capability, and documented in the device’s electronic logbook per ISO/IEC 17025 clause 5.9.4.