NS264
Major Substation Lightning Protection and Insulation Coordination
NS264: Major Substation Lightning Protection and Insulation Coordination
The purpose of this document is to identify the minimum lightning protection and insulation coordination requirements for design and construction of major substations. The aim is to minimise equipment damage and network outages due to overvoltages as far as reasonably practical.
Scope
This document defines the requirements for:
- Design, construction and documentation of major substation lightning protection systems;
- Minimum equipment insulation requirements for major substations; and
- Minimum overvoltage protective requirements (surge arresters and overhead earth wires) for
major substations.
Design, construction and commissioning of earthing systems for major substations are covered in Ausgrid network standard NS222 Major Substation Earthing Layout Design.
Lightning protection and insulation coordination design for overhead and underground transmission and distribution mains are covered in Ausgrid network standards NS109, NS126, NS135, NS168, NS220 and NS260.