Overview
IEC 61869-10:2017 is an international standard developed by the International Electrotechnical Commission (IEC) focusing on instrument transformers, specifically addressing additional requirements for low-power passive current transformers (LPCTs). This standard forms part 10 of the IEC 61869 series and supplements the general and specific requirements outlined in IEC 61869-1 and IEC 61869-6.
Primarily applicable to newly manufactured LPCTs with analogue outputs, the standard covers transformers intended for use with electrical measuring instruments and protective devices, operating within a rated frequency range of 15 Hz to 100 Hz. It applies broadly to LPCTs used both for measurement and protection functions, including multi-purpose units.
This edition replaces the earlier IEC 60044-8 (2002) publication, reflecting a significant technical revision that aligns with the restructuring of IEC TC 38's standards series for instrument transformers.
Key Topics
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Scope and Application: The standard addresses only additional requirements, complementing the broader product family standards for LPCTs.
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Ratings and Performance Parameters: Defines standard values related to rated primary current, rated output, insulation levels, accuracy classes, and thermal current capabilities.
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Design and Construction Requirements: Emphasizes critical elements such as electromagnetic compatibility (EMC), marking conventions on terminals, signal-to-noise performance, reliability, vibrations resistance, and failure detection.
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Testing Procedures: Specifies type tests, general and special tests including accuracy assessments, thermal withstand tests, and positional accuracy tests.
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Accuracy and Ratio Correction: Details the designation of accuracy classes, considering corrected transformation ratios and ratio correction factors to enhance measurement precision.
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Optical and Electrical Output Systems: Outlines specific requirements for signal transmission systems, whether optical or electrical, to ensure consistent performance and maintenance transparency.
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Informative Annexes: Provide foundational knowledge on key technologies such as Rogowski coils and iron core LPCT operation principles, enhancing understanding of device functionality and accuracy features.
Applications
IEC 61869-10:2017 is tailored for applications including:
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Electrical Power Measurement: Ensuring accurate current measurement in power distribution and generation systems.
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Protective Relaying: Facilitating reliable current sensing needed for protective relays that safeguard electrical networks against faults.
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Multi-Purpose Current Transformers: Supporting devices that serve both metering and protection functions, optimizing installation and operational efficiency.
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Analog Signal Output Systems: Governing LPCTs with analogue outputs for compatibility with traditional electrical measuring instruments.
The emphasis on low-power and passive designs aligns with modern power system needs, providing improved safety, reduced energy consumption, and enhanced measurement accuracy.
Related Standards
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IEC 61869-1: General requirements for instrument transformers, establishing foundational principles governing performance, safety, and testing.
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IEC 61869-6: Specific requirements for low-power instrument transformers, serving as the key companion document to IEC 61869-10.
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IEC 61869-8 / IEC 61869-9: Additional parts of the IEC 61869 series that collectively replaced the earlier IEC 60044 series, standardizing instrument transformer requirements.
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IEC 60044-8 (superseded): The previous standard for low-power current transformers, now technically revised and integrated into the IEC 61869 series.
By following IEC 61869-10, manufacturers and users of low-power passive current transformers ensure compliance with internationally recognized benchmarks, enhancing interoperability and safety in electrical power systems.
Keywords: IEC 61869-10, low-power passive current transformers, instrument transformers, LPCT, electrical measurement, protective devices, analogue output, accuracy class, rated current, electromagnetic compatibility, IEC standards, current transformer testing, Rogowski coil, iron core transformer.
Open preview (PDF)Instrument transformers - Part 10: Additional requirements for low-power passive current transformers
