AS 61869.1, 2024 Edition – Instrument transformers, Part 1: General requirements (IEC 61869-1:2023 (ED 2.0) MOD)

AS 61869.1:2024 is part of the Australian Standards series related to instrument transformers, specifically dealing with their general requirements. This standard sets out the basic requirements for instrument transformers used for measurement, protection, and control systems, particularly for electrical circuits.

Here’s a general overview of AS 61869.1:2024:

1. Scope

AS 61869.1:2024 outlines the general requirements and testing methods for instrument transformers used in electrical systems. These include current transformers (CTs) and voltage transformers (VTs), which are used to step down high voltages or currents to measurable levels for monitoring and protection purposes.
The standard also applies to combined instrument transformers (which integrate multiple functionalities into one unit) and other related equipment.

2. Key Requirements

Design and Construction: The standard specifies the general design, construction, and performance criteria that instrument transformers must meet to ensure reliability and safety.
Electrical Performance: It includes requirements for the transformer’s accuracy class, voltage and current ratings, and other electrical characteristics to ensure the transformer works correctly under normal operating conditions and during faults.
Safety and Insulation: Instrument transformers must be designed with adequate insulation to handle electrical stress and provide safety for users, as well as meet certain environmental and mechanical standards.
Testing Procedures: It outlines methods for routine, type, and special tests that ensure the transformers meet the specified requirements. This can include tests like voltage withstand, insulation resistance, and accuracy under load.

3. General Principles

Accuracy: The transformers must have defined accuracy classes, ensuring they provide reliable readings for measurement and protection systems.
Reliability and Durability: The equipment should be durable under a variety of environmental conditions, including temperature, humidity, and mechanical stress.
Installation and Maintenance: Guidance on how to install, operate, and maintain these transformers, including any recommendations for periodic inspections.

4. Applications

AS 61869.1:2024 is relevant for utility companies, electrical manufacturers, and companies involved in power generation, transmission, and distribution systems.
It also applies to industries that rely on electrical measurements and protection, such as industrial automation, renewable energy systems, and heavy machinery.

5. Relation to Other Standards

AS 61869.1:2024 is part of a larger suite of standards for instrument transformers, which includes more specific standards related to current transformers, voltage transformers, and other specialized devices. The standard works in conjunction with these other documents to ensure the complete and safe operation of electrical measurement and protection systems.

This standard is essential for ensuring that instrument transformers operate efficiently, safely, and accurately within electrical systems.