En 61869-2 !!link!! Jun 2026

Overview of EN 61869-2

Standard Name : Instrument transformers - Part 2: Additional requirements for current transformers International Electrotechnical Commission (IEC) Equivalent : IEC 61869-2 European Standard : EN 61869-2

Purpose and Scope The EN 61869-2 standard outlines the requirements for current transformers used in electrical measurement and control devices. Its primary purpose is to ensure the accuracy, reliability, and safety of current transformers in various applications, including power generation, transmission, distribution, and electrical measurement. Key Features and Requirements

Accuracy Classes : The standard defines various accuracy classes for current transformers, specifying the maximum allowable errors in terms of ratio and phase angle for each class. Common classes include 0.1, 0.2, 0.5, 1, and 3. en 61869-2

Rated Primary and Secondary Currents : It specifies the requirements for rated primary and secondary currents, including standard values and the method of specifying these currents.

Rated Burden and Limiting Output : The standard details the rated burden (the load that the current transformer can handle) and the limiting output (the maximum output the transformer can provide).

Transient Performance : For current transformers intended for protective relaying, the standard addresses transient performance requirements, including the ability to accurately transform currents under short-circuit conditions. Overview of EN 61869-2 Standard Name : Instrument

Construction and Testing : EN 61869-2 includes requirements for the construction, testing, and verification of current transformers to ensure they meet specified performance and safety standards.

Safety and Environmental Conditions : The standard covers aspects of safety, such as insulation levels, and environmental conditions like temperature and humidity ranges for operation.

Marking and Documentation : Requirements for the marking of current transformers and the documentation to be provided by the manufacturer are also included. Common classes include 0

Applications Current transformers that comply with EN 61869-2 are used in a wide range of applications, including:

Power Generation and Transmission : For measuring currents in generators, transmission lines, and substations. Distribution Networks : In distribution substations and consumer metering. Protection and Control Systems : As part of protective relaying systems to detect faults and control circuit breakers.