IEC 62361-2:2013

Overview

IEC 62361-2:2013 is an international standard developed by the International Electrotechnical Commission (IEC) focusing on power systems management and data exchange interoperability over the long term. Specifically, Part 2 of this standard addresses end-to-end quality codes for Supervisory Control and Data Acquisition (SCADA) systems. It defines a comprehensive and cohesive set of quality codes used within IEC standards to ensure reliable, interoperable SCADA data exchanges in power system management environments.

The standard excludes meter reading quality coding, concentrating instead on quality aspects critical to supervisory control, data acquisition, and the associated information exchange. It documents how quality codes from existing standards map to one another, noting any potential information loss in the mapping process, and establishes a common semantics framework for quality codes.

Key Topics

• Quality Codes in SCADA Systems: IEC 62361-2:2013 reviews and consolidates quality code definitions from multiple existing standards such as IEC 60870-5, IEC 61850, IEC 61970, IEC 60870-6 (TASE.2), OPC Data Access (DA), OPC Unified Architecture (UA), and DAIS DA.

• End-to-End Quality Flow: The standard provides detailed flow diagrams illustrating how quality codes propagate from substations to control centers, ensuring that data integrity and timing information is preserved across communication layers.

• Mapping Between Standards: A critical feature of IEC 62361-2 is the defined mapping rules for quality codes exchanged between different IEC standards, facilitating interoperability between heterogeneous power system management solutions.

• Common Quality Codes List: The document presents a unified list of quality codes with explicit semantics covering data validity, timestamp accuracy, source reliability, and substitution flags. This harmonization minimizes ambiguity in SCADA data interpretation.

• Timestamp and Data Related Quality: It emphasizes quality aspects related to data timestamps and value accuracy, reinforcing the need for precise time synchronization and quality attribute consistency in SCADA deployments.

Applications

• Power System Management: Power utilities implementing supervisory control and data acquisition systems benefit from consistent quality reporting and interpretation, enabling better decision-making and system reliability.

• Interoperability in Multi-Vendor Environments: By adhering to IEC 62361-2, organizations can ensure that various SCADA components, possibly from different vendors and compliant with different IEC standards, work together seamlessly with reliable quality indication.

• Control Center Operations: Quality codes enable operators to assess the reliability and validity of incoming data, essential for real-time grid monitoring, fault detection, and system control.

• Integration of Legacy and Modern Systems: The standard supports data quality interoperability between older protocols like IEC 60870-5 and modern solutions based on IEC 61850 or OPC UA, protecting investments while modernizing infrastructure.

Related Standards

• IEC 60870 Series: Covers telecontrol protocols commonly used in electrical power systems for communication between control centers and substations.

• IEC 61850: Provides a comprehensive framework for communication networks and systems in substations, including data modeling and exchange.

• IEC 61970 (CIM): Defines the Common Information Model for power system operations, focused on energy management system integration.

• IEC 60870-6 (TASE.2): Addresses telecontrol application service element protocols for wide-area network communication.

• OPC DA / OPC UA: Industrial interoperability standards for real-time data access and complex object exchange across hardware and software platforms.

• DAIS DA: A profile developed for distributed automation systems, supporting data access with quality attributes.

Conclusion

IEC 62361-2:2013 provides a vital framework for maintaining and exchanging high-quality data within SCADA systems in power system management. By unifying quality codes across multiple IEC and related standards and enabling mappings among them, it supports long-term interoperability and system reliability. This ultimately empowers energy companies to optimize grid operations, enhance communication reliability, and future-proof their supervisory control and data acquisition investments.

Keywords: IEC 62361-2, SCADA quality codes, power systems management, interoperability standards, IEC 61850 quality, IEC 60870-5, data integrity, supervisory control, timestamp accuracy, OPC UA quality codes, IEC power system standards.