IEC 61869-9-2016 PDF

Full title and description

IEC 61869-9:2016 — Instrument transformers — Part 9: Digital interface for instrument transformers. This part of the IEC 61869 family defines requirements for instrument transformers that provide digital outputs (electronic low-power instrument transformers — LPIT) and for the digital communications of instrument-transformer measurement data, including sampled values and associated timing/synchronization provisions.

Abstract

IEC 61869-9:2016 is the first edition (2016) product-standard specification that covers the digital interface for instrument transformers. It specifies how instrument-transformer signals may be represented, transmitted and time‑synchronised in digital form (sampled values), aligns with IEC 61850 digital‑communication concepts (notably IEC 61850-9-2 guidance), incorporates network-based time synchronization (IEC 61588 / IEEE 1588 family), and replaces the specific requirements formerly published in IEC 60044-8. The standard is intended to ensure accurate measurement, interoperability and testability of LPITs and related merging units in modern substations and measurement systems.

General information

• Status: Published (first edition).
• Publication date: 27 April 2016.
• Publisher: International Electrotechnical Commission (IEC).
• ICS / categories: 17.220.20 (Measurement of electrical and magnetic quantities).
• Edition / version: Edition 1.0 (2016).
• Number of pages: 60 (English edition); 127 (English/French bilingual edition).

Scope

This standard applies to instrument transformers that provide digital outputs (LPITs) and to their digital interfaces. It defines requirements for the representation and transmission of measured quantities (sampled values), message formats and mapping consistent with IEC 61850 principles, time‑synchronization requirements (network time protocols and profiles), performance and accuracy classes, tests and verification procedures, and applicable safety/EMC considerations. It replaces the specific digital-interface requirements previously found in IEC 60044-8 and is to be used together with the common product requirements of IEC 61869-1 and the general requirements of IEC 61869-6 and other relevant parts of the IEC 61869 series.

Key topics and requirements

• Definition of LPITs (electronic low‑power instrument transformers) and requirements for devices with digital outputs.
• Specification of sampled-data representation and sampled-value communications for instrument-transformer outputs.
• Mapping and implementation guidance consistent with IEC 61850 (notably IEC 61850‑9‑2 concepts) to promote interoperability.
• Time and frequency synchronization requirements (network-based time sync, e.g., IEC 61588 / IEEE 1588 profiles) for accurate timestamping of measurements.
• Performance, accuracy and classification criteria for digital measurement outputs and merging units.
• Test methods and verification procedures for functional, metrological and communication characteristics.
• Requirements to replace and supersede legacy digital‑interface clauses of IEC 60044-8.
• Normative references and coordination with IEC 61869-1, IEC 61869-6 and other IEC 61869 parts for a complete product-family description.

Typical use and users

IEC 61869-9:2016 is used by electrical utilities, substation and protection engineers, instrument-transformer and merging-unit manufacturers, test laboratories, system integrators and standards/ regulatory bodies. Typical applications include digital substation measurement and protection systems, metering, monitoring, and any installation requiring accurate, time‑synchronised digital outputs from instrument transformers.

Related standards

IEC 61869-9 is part of the IEC 61869 instrument-transformer family and is intended to be used with IEC 61869-1 (General requirements) and IEC 61869-6 (Particular requirements). It replaces the specific digital-interface requirements in IEC 60044-8. Closely related standards and documents include the IEC 61850 series (sampled values and system communication, e.g., IEC 61850-9-2), IEC 61588 (time-synchronization profile), and other parts of IEC 61869 (Parts 7, 8, 10, 12, 13, 14, 15). National/adopted versions (for example EN/BS adoptions) also exist.

Keywords

Instrument transformer, LPIT, digital interface, sampled values, IEC 61850-9-2, merging unit (MU), SAMU, time synchronization, IEC 61588, IEEE 1588, sampled-data, digital substation, IEC 60044-8 replacement.

FAQ

Q: What is this standard?

A: IEC 61869-9:2016 is the IEC product-family standard that specifies the digital interface requirements for instrument transformers (electronic low‑power instrument transformers and related merging units), covering sampled-value communications, timing and interoperability.

Q: What does it cover?

A: It covers data representation (sampled values), communication mapping consistent with IEC 61850 principles, time‑synchronization requirements, performance/accuracy criteria, test methods and provisions needed to ensure interoperable, time‑accurate digital outputs from instrument transformers.

Q: Who typically uses it?

A: Utilities, protection and metering engineers, instrument‑transformer and merging‑unit manufacturers, test houses, system integrators and standards committees use the standard when designing, manufacturing, testing or specifying digital instrument-transformer solutions.

Q: Is it current or superseded?

A: This is the first edition, published on 27 April 2016. It supersedes the digital‑interface clauses of IEC 60044-8. Users should verify whether later amendments, corrigenda or a newer edition have been published by checking the IEC publications catalogue or national standards bodies when up‑to‑date status is critical for procurement or compliance.

Q: Is it part of a series?

A: Yes — IEC 61869-9 is Part 9 of the IEC 61869 series (Instrument transformers). It is intended to be used alongside IEC 61869-1 (general requirements), IEC 61869-6 and other part‑specific standards in the IEC 61869 family.

Q: What are the key keywords?

A: LPIT, digital interface, sampled values, IEC 61850, merging unit, time synchronization, IEC 61588, instrument transformer, IEC 60044-8 (replaced).