IEC 61869-14-2018 PDF

Full title and description

Instrument transformers – Part 14: Additional requirements for current transformers for DC applications. This International Standard (IEC 61869-14:2018) specifies additional requirements and tests for current transformers intended for use in DC power systems (DCCTs), covering devices with analogue or digital outputs and addressing performance, dielectric, thermal and application-related requirements for measurement, protection and control in DC systems.

Abstract

IEC 61869-14:2018 provides requirements specific to current transformers used in DC applications, including functional definitions, performance under DC with significant harmonics, insulation and dielectric ratings, testing and marking. The standard applies to newly manufactured DC current transformers for measuring, protection and control in DC power systems (rated voltage above 1.5 kV) and notes explicit exclusions (for example certain CTs in the transistor branch of VSC valves).

General information

• Status: International Standard — published and in force; also adopted as EN IEC 61869-14.
• Publication date: 17 July 2018.
• Publisher: International Electrotechnical Commission (IEC).
• ICS / categories: 17.220.20 — Measurement of electrical and magnetic quantities; category: Instrument transformers / LVDC applications.
• Edition / version: Edition 1.0 (2018).
• Number of pages: 85 pages (IEC webstore bibliographic listing).

Scope

Applies to current transformers intended for DC applications with one or more of the following functions: measuring DC current (including cases with significant harmonics) and withstanding DC voltage. The standard covers both analogue and digital outputs and is intended for DC power systems with rated voltages above 1.5 kV. Specific CT arrangements used inside the transistor branch of certain VSC valves are excluded and noted for future consideration. The document complements the general clauses of the IEC 61869 series (including IEC 61869-1 and IEC 61869-6) by giving DC-specific additional requirements.

Key topics and requirements

• Definitions and classification of instrument transformers for DC applications (DCCTs) and related dielectric rating terms.
• Accuracy, linearity and behaviour under DC conditions and when significant harmonics are present.
• Requirements for analogue and digital output signal performance, including low-power/digital interface considerations where relevant.
• Dielectric, insulation and voltage-withstand tests appropriate to DC systems and the specified highest voltage for equipment.
• Thermal and continuous-duty limits, short-time and overload performance in DC environments.
• Mechanical, environmental and mounting requirements for safe installation in DC networks.
• Type and routine tests, measuring procedures and marking, documentation and manufacturer information required for compliance.

Typical use and users

Used by manufacturers of DC current transformers (including non-conventional and low-power technologies), test laboratories, utility engineers and protection/control equipment designers working on HVDC and other DC power systems (over 1.5 kV). Typical applications include measurement and protection in HVDC converter stations, subsea DC links, DC traction and industrial DC networks where accurate DC current measurement and DC voltage withstand capability are required.

Related standards

IEC 61869-14 is one part of the IEC 61869 series (instrument transformers). Relevant companion parts include IEC 61869-1 (general requirements), IEC 61869-2/3/6 (product-specific additional requirements), IEC 61869-9 (digital interface for instrument transformers) and other parts addressing low-power and merging unit topics. The part was also submitted and adopted as EN IEC 61869-14:2019 in the European system.

Keywords

IEC 61869-14, DCCT, current transformer, instrument transformer, DC applications, HVDC, LVDC, dielectric tests, low-power instrument transformer, digital output, IEC 61869, accuracy class.

FAQ

Q: What is this standard?

A: IEC 61869-14:2018 is the part of the IEC 61869 series that specifies additional requirements and tests for current transformers intended for DC applications (DCCTs).

Q: What does it cover?

A: It covers functional definitions, performance requirements (including behaviour with DC and harmonics), dielectric and insulation requirements, thermal and mechanical criteria, testing procedures and marking/documentation requirements for DC current transformers with analogue or digital outputs. Certain specialised CTs (e.g., some transistor-branch measurements in VSC valves) are excluded.

Q: Who typically uses it?

A: Manufacturers, utilities, protection and control engineers, testing laboratories and standards committees involved in HVDC, LVDC and other DC power systems where accurate current measurement and DC voltage withstand capability are required.

Q: Is it current or superseded?

A: IEC 61869-14:2018 is the current edition published 17 July 2018 and has been adopted as EN IEC 61869-14:2019 in Europe; the IEC webstore lists a stability date (bibliographic validity) to 2026. Users should verify whether any amendments, corrigenda or newer editions have been released since publication when procuring equipment or performing compliance work.

Q: Is it part of a series?

A: Yes — it is part of the IEC 61869 family (Instrument Transformers). The series contains general requirements (Part 1) and multiple product-specific parts and digital-interface/merging-unit parts that together define requirements for conventional and non-conventional instrument transformers.

Q: What are the key keywords?

A: DCCT, current transformer, instrument transformer, DC applications, HVDC, LVDC, dielectric test, accuracy, low-power, digital output, IEC 61869.