TS EN IEC 61869-99

TS EN IEC 61869-99 is the glossary part for the instrument transformers field, collecting the specific terminology and definitions used across the IEC 61869 series. Rather than setting performance requirements for a particular device, it provides a shared technical language for the series so that current transformers, voltage transformers, and related instrument-transformer concepts are used consistently.

Why a glossary matters in instrument transformer work

Instrument transformers are electrical devices used to scale high current or high voltage down to values that measuring and protection equipment can handle more readily. In a technical field like this, a term may carry slightly different meanings from one part of a series to another, so a common glossary reduces ambiguity in design, testing, documentation, and engineering communication. As general technical context, noting that periodic electrical quantities are understood as RMS values reflects the usual practice of interpreting alternating quantities by their effective value, which is central to electrical measurement and comparison.

What this document covers

• It contains the glossary of specific terminology and definitions used in the IEC 61869 series.
• It supports consistent interpretation of common concepts appearing throughout the different parts of the series.
• Unless otherwise specified, periodic electrical quantities are taken as RMS values.
• It serves as a reference language for engineering, test, and documentation work where terminology consistency matters.