GB/T 20840.10-2025 Active National standards

GB/T 20840.10-2025 Instrument transformers—Part 10:Additional requirements for low-power passive current transformers

Publish Date: 2025-01-24 Implement Date: 2025-08-01 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

Basic Information

Standard Code: GB/T 20840.10-2025

Standard Type: National standards

Standard Status: Active

is_force_gb: no

CCS Name: Transformer

ICS Name: Transformers, reactors, and inductors

Publish Date: 2025-01-24

Implement Date: 2025-08-01

Pages: 40 pages

Scope

This document specifies the supplementary technical requirements for low-power passive current transformers (LPCTs) with only analog voltage output in terms of terminology and definitions, rated values, design and structure, testing and consultation, bidding and ordering instructions, etc. This document applies to newly manufactured analog LPCTs with a rated frequency of 15 Hz to 100 Hz, used for measurement, protection, or multi-purpose functions involving both measurement and protection in electrical measurement instruments or relay protection devices. This document does not apply to electronic current transformers with digital output or those using any type of active electronic component technology. Note 1: GB/T 20840.5-6.1003 specifies the accuracy requirements for passive LPCTs used in electrical measurement instruments. Note 2: GB/T 20840.5-6.1004 specifies the accuracy requirements for passive LPCTs used in relay protection devices, particularly for protection methods that maintain accuracy even when the current reaches several times the rated value. Additionally, it specifies the transient accuracy of passive LPCTs during fault conditions if required. Note 3: Passive LPCTs only have analog voltage output (for digital output or technologies using any type of active electronic components, refer to GB/T 20840.8). Such passive LPCTs may include secondary signal cables (transmission cables). Appendix 10C explains the working principle of derivative-type LPCTs using hollow coils (Rogowski coils), and Appendix 10D explains the working principle of proportional-type LPCTs using integrated shunt resistors and core coils.

Development Information

Word Count: 65 Thousand words Pages: 40 pages

Same series standard

GB/T 20840.11-2025 Instrument transformers—Part 11:Additional requirements for low-power passive voltage transformers GB/T 20840.99-2025 Instrument transformers—Part 99:Glossary

Referenced Standards

GB/T 15022.7-2017 Resin based reactive compounds used for electrical insulation—Part 7:Epoxy-anhydride vacuum pressure impregnation(VPI) resin GB/T 15022.8-2017 Resin based reactive compounds used for electrical insulation—Part 8:Epoxy modified unsaturated polyester vacuum pressure impregnation (VPI) resin GB/T 15022.9-2022 Resin based reactive compounds used for electrical insulation—Part 9: Resins for cable accessories GB/T 15022.10-2023 Resin based reactive compounds used for electrical insulation—Part 10:Polyesterimide resin composite GB/T 16927.1-1997 High-voltage test techniques Part 1:General test requirements GB/T 16927.1-2011 High-voltage test techniques—Part 1:General definitions and test requirements GB/T 17623-1998 Determination of componental contents of gases dissolved in insulating oil by gas chromatography method GB/T 17623-2017 Determination of componental contents of gases dissolvedin insulating oil by gas chromatography method GB/T 20138-2006 Degrees of protection provided by enclosures for electrical equipment against external mechanical impacts(IK code) GB/T 21221-2007 Insulating liquids—Specifications for unused insulating liquids based on synthetic aromatic hydrocarbons GB/T 21221-2022 Insulating liquids—Specifications for unused liquids based on synthetic aromatic hydrocarbons GB/T 21429-2008 Composite insulators-Hollow insulators for use in outdoor and indoor electrical equipment—Definitions,test methods,acceptance criteria and design recommendations JB/T 5895 IEC 60296 IEC 60376 IEC 61634 IEC 62155 IEC 62271-2 IEC导则109 ISO 3231 GB/T 7826-1987 Analysis techniques for system reliability—Procedure for failure mode and effects analysis(FMEA) GB/T 7826-2012 Analysis techniques for system reliability—Procedure for failure mode and effects analysis(FMEA) GB/T 17626.11-1999 Electromagnetic compatibility—Testing and measurement techniques—Voltage dips, short interruptions and voltage variations immunity tests GB/T 17626.11-2008 Electromagnetic compatibility—Testing and measurement techniques—Voltage dips,short interruptions and voltage variations immunity tests GB/T 17626.11-2023 Electromagnetic compatibility—Testing and measurement techniques—Part 11:Voltage dips, short interruptions and voltage variations immunity tests for equipment with input current up to 16 A per phase GB/T 17626.29-2006 Electromagnetic compatibility—Testing and measurement techniques—Voltage dips, short interruptions and voltage variations on d.c .input power port immunity tests GB/T 20840.1-2010 Instrument transformers—Part 1:General requirements GB/T 20840.2-2014 Instrument transformers—Part 2:Additional requirements for current transformers GB/T 20840.3-2013 Instrument transformers—Part 3:Additional requirements for inductive voltage transformers IEC 60068-2-6:2007 IEC 60255-27:2013 IEC 60603-7-1:2011 IEC 60794-2:2002 IEC 60794-3:2014 IEC 61000-4-1:2006 IEC 61000-4-2:2008 IEC 61000-4-3:2006+IEC 61000-4-3:2006/AMD1:2007+IEC 61000-4-3:2006/AMD2:2010 IEC 61000-4-4:2012 IEC 61000-4-5:2014 IEC 61000-4-6:2013 IEC 61000-4-7:2002+IEC 61000-4-7:2002/AMD1:2008 IEC 61000-4-8:2009 IEC 61000-4-9:1993+IEC 61000-4-9:1993/AMD 1:2000 IEC 61000-4-10:1993+IEC 61000-4-10:1993/AMD1:2000 IEC 61000-4-13:2002+IEC 61000-4-13:2002/AMD1:2009 IEC 61000-4-16:1998+IEC 61000-4-16:1998/AMD1:2001+IEC 61000-4-16:1998/AMD2:2009 IEC 61000-4-18:2006+IEC 61000-4-18:2006/AMD1:2010 IEC 61025:2006 IEC 61076-2-101:2012 IEC 61850-2:2003 IEC 61850-7-4:2010 IEC/TR 61869-103:2012 IEC 62271-100:2008 ISO/IEC/IEEE 21451-4:2010 CISPR 11:2015 EN 50160:2010 GB/T 762-2002 Standard current ratings GB/T 20840.1-2010 Instrument transformers—Part 1:General requirements GB/T 20840.6-2017 Instrument transformers—Part 6:Additional general requirements for low-power instrument transformers

Adopt standards

IEC 61869-10:2017

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