IEC 61869-11-2017 PDF

Full title and description

IEC 61869-11:2017 — Instrument transformers — Part 11: Additional requirements for low‑power passive voltage transformers. This part of the IEC 61869 series specifies additional product requirements for low‑power passive voltage transformers (passive LPVT) with analogue output used for measurement and/or protection in electrical power systems.

Abstract

IEC 61869-11:2017 is a product standard that supplements IEC 61869-1 and IEC 61869-6 with specific requirements for passive low‑power voltage transformers (LPVT) having analogue outputs. It applies to newly manufactured passive LPVTs with rated frequencies from 15 Hz to 100 Hz and covers design, ratings, tests, accuracy designation and information to be supplied with enquiries, tenders and orders. This edition replaces relevant clauses of the earlier IEC 60044 series and constitutes a technical revision.

General information

• Status: Current (first edition, published 2017).
• Publication date: 13 December 2017.
• Publisher: International Electrotechnical Commission (IEC).
• ICS / categories: 17.220.20 (Measurement of electrical and magnetic quantities).
• Edition / version: Edition 1.0 (2017).
• Number of pages: 67 pages.

Scope

This document gives additional requirements for passive low‑power voltage transformers (LPVT) with analogue (proportional) secondary voltage output used for electrical measuring instruments and electrical protection devices. It covers LPVTs intended for measurement, protection or combined measurement and protection and is applicable for rated frequencies from 15 Hz to 100 Hz. The standard excludes devices providing derivative or digital outputs and does not cover active electronic transformer technologies (addressed elsewhere in the 61869 series). The part can include the secondary signal/transmitting cable as part of the LPVT assembly.

Key topics and requirements

• Definitions and terms specific to low‑power passive voltage transformers.
• Ratings and marking requirements (rated primary/secondary values, frequency range, accuracy class and burden).
• Design and construction requirements including insulation, creepage, mechanical robustness and inclusion/consideration of secondary cable.
• Performance and type tests (accuracy, thermal, insulation, electromagnetic/environmental, long‑term stability and tests for the impact of electric field from other phases — normative annexes).
• Information to be given with enquiries, tenders and orders (required technical data and test requirements).
• Guidance on designation of accuracy class including correction factors and use with corrected transformation ratios (informative annexes).
• Coordination with IEC 61869‑1 and IEC 61869‑6 (series framework and application notes).

Typical use and users

Typical users include power utilities, protection and metering engineers, transformer and LPVT manufacturers, testing and certification laboratories, and standards/specification authors. The standard is used to specify, procure, test and certify low‑power passive voltage transformers intended for metering and protection applications in transmission and distribution systems.

Related standards

IEC 61869-11 is part of the IEC 61869 series and is intended to be used together with IEC 61869-1 (general requirements) and IEC 61869-6 (additional requirements for inductive voltage transformers). It replaces relevant clauses of IEC 60044-7 and IEC 60044-8. The document has been adopted regionally (for example as EN IEC 61869-11) and has related national/adopted versions such as CSA C61869-11 (Canadian adoption). An Interpretation Sheet (ISH1) updating/clarifying certain points was published in September 2021.

Keywords

LPVT, low‑power passive voltage transformer, passive LVPT, instrument transformer, voltage divider, metering, protection, accuracy class, IEC 61869, analogue output.

FAQ

Q: What is this standard?

A: IEC 61869-11:2017 is the part of the IEC 61869 series that sets additional product requirements for low‑power passive voltage transformers (LPVT) with analogue outputs used for measurement and protection in power systems.

Q: What does it cover?

A: It covers definitions, ratings, design and construction, required tests (type and routine), marking and information to be supplied with orders for passive LPVTs with rated frequencies from 15 Hz to 100 Hz; it excludes active electronic transformer technologies and derivative/digital outputs.

Q: Who typically uses it?

A: Utilities, protection and metering engineers, manufacturers of LPVTs, test houses and standards writers use the standard to specify, design, test and verify LPVTs for metering and protection applications.

Q: Is it current or superseded?

A: This is the first edition published in December 2017 and is current; the IEC record lists a stability date extending into 2027. An Interpretation Sheet (ISH1) updating clarifications was issued in September 2021.

Q: Is it part of a series?

A: Yes — IEC 61869 is a multipart series on instrument transformers. Part 11 is intended to be used alongside IEC 61869-1 (general requirements) and IEC 61869-6 (inductive voltage transformers); related parts cover low‑power current transformers, digital interfaces and DC applications.

Q: What are the key keywords?

A: LPVT, low‑power passive voltage transformer, instrument transformer, voltage divider, metering, protection, accuracy class, analogue output.