IEC 61869-1 is the overarching international standard that defines the general requirements for instrument transformers. It applies to newly manufactured current transformers (CTs), voltage transformers (VTs), and combined transformers intended for use in electrical power systems with frequencies from 15 Hz to 100 Hz. The Evolution of the Standard
At the heart of IEC 61850 is an object-oriented data model that describes every function of a power system device in a standardized way. For example, a circuit breaker isn't just a point; it's a Logical Node containing specific data attributes for its status, position, and control commands. This allows devices to be "self-describing" and enables advanced engineering tools to automatically configure systems based on standardized definitions.
Tests structural integrity against short-term overvoltages.
Before IEC 61869, the instrument transformer landscape was defined by the series. Around a decade ago, IEC Technical Committee 38 (TC 38) decided to restructure the entire set of stand‑alone standards in the IEC 60044 series and transform it into a new modular framework, leading to the IEC 61869 series. iec 618691 pdf
Specific requirements for inductive voltage transformers (VTs).
Regional standard authorities like ANSI (USA), BSI (UK), DIN (Germany), or ISO members offer licensed copies.
The standard defines normal operating conditions for electrical equipment, divided into environmental subcategories: IEC 61869-1 is the overarching international standard that
(PDF) On single pole instrument voltage transformer overheating
Typically restricted to less than 10 pC or 5 pC depending on insulation type (solid plastic vs. oil-immersed) to guarantee long-term insulation life.
Specific requirements for current transformers (CTs). For example, a circuit breaker isn't just a
: The IEC Webstore is the primary source for the 2023 edition.
IEC 61869-1, titled "Instrument transformers – Part 1: General requirements," defines the common characteristics and testing procedures applicable to all types of instrument transformers.