AS 60071.1, 2024 – Insulation co-ordination, Part 1: Definitions, principles and rules (IEC 60071-1:2019 (ED. 9.0) MOD)

AS 60071.1:2024 is the Australian standard that provides guidelines for insulation coordination of high-voltage electrical systems. This standard outlines the procedures for determining the required insulation levels of equipment based on factors like the expected overvoltages and environmental conditions. It is based on the international standard IEC 60071-1.

Key Areas Covered in AS 60071.1:2024:

Scope and Purpose:
- Focuses on insulation coordination for high-voltage systems (above 1 kV).
- Provides a framework for selecting appropriate insulation levels to ensure the reliable performance of electrical equipment in power systems.
Voltage Definitions:
- Defines various voltage categories like rated voltages, highest system voltages, and overvoltages (e.g., lightning and switching surges).
Insulation Coordination Process:
- A methodical approach to evaluating the insulation levels based on expected electrical stress, overvoltages, and system configurations.
- Involves determining the appropriate insulation ratings for transformers, circuit breakers, switchgear, and other equipment.
Overvoltage Considerations:
- Considers external factors like lightning and switching operations, which can cause overvoltages, affecting the insulation.
- Offers methods for mitigating these overvoltages, such as surge arresters.
Environmental Factors:
- Takes into account conditions like humidity, pollution, and altitude, which can influence the required insulation levels.
Testing and Verification:
- Describes the types of testing required to verify the insulation performance, including lightning impulse tests and power-frequency voltage tests.

This standard helps ensure the safe and reliable operation of electrical equipment in high-voltage networks, reducing the risk of insulation failure and system outages.