IEC 61869-1 applies to newly manufactured instrument transformers designed for use in electrical power systems with frequencies from 15 Hz to 100 Hz. It covers equipment intended for both indoor and outdoor applications.
The IEC 61869 series replaced the older IEC 60044 standards to streamline specifications and accommodate digital technologies like merging units and non-conventional instrument transformers (NCITs). The series uses a modular two-part structure:
| Part Number | Title | What It Covers | | :--- | :--- | :--- | | IEC 61850-1 | Introduction and overview | Basic concepts and use cases | | IEC 61850-5 | Communication requirements | Functional & performance requirements | | IEC 61850-6 | Substation configuration language (SCL) | The XML schema for configuration files (CID, ICD, SSD, SCD) | | IEC 61850-7-2 | Basic communication structure – ACSI (Abstract Communication Service Interface) | The core data model and services | | IEC 61850-8-1 | Mappings to MMS | How the services are mapped to Ethernet & TCP/IP | | IEC 61850-9-2 | Sampled values over Ethernet | Digital instrument transformer data transmission |
Defines permissible limits for both analogue and digital secondary signals, including specific requirements for harmonics and anti-aliasing filters (Clause 5.7). iec 618691 pdf
If your work involves (CTs – Current Transformers, or VTs/VTs – Voltage Transformers), the correct standard is IEC 61869 . This standard replaces the older IEC 60044 series.
Specifies limits for indoor and outdoor installations (typically ranging from -5 °C to +40 °C for indoor, and -40 °C to +40 °C for outdoor).
for current (Part 2) or voltage (Part 3) transformers. Differences between 2007 and 2023 editions. Digital interface (Part 9) requirements. The series uses a modular two-part structure: |
Specific requirements for capacitor voltage transformers (CVTs).
European standards (EN IEC 61869-1:2024) are available through national standards bodies like BSI .
Equipment must withstand physical stress during its operational lifespan. IEC 61869-1 specifies: BSI in the United Kingdom
: Introduced in the 2023 edition to ensure proper installation on-site. Power Research - A Journal of CPRI 🔄 Relationship with Other Standards
Regional authorities (such as ANSI in the United States, BSI in the United Kingdom, or DIN in Germany) offer localized adaptations or direct sales of the standard.
The standard categorizes operations into normal and special service conditions.