scope:

This guide provides the definition, formation, and characteristics of fast-front and very fast-front overvoltages. The various measuring techniques, including technical details that may be adopted for field application, are also described. Field measurement results measured using the techniques described in this guide are included for reference.

This guide supports the development of field measuring systems for fast-front and very fast-front overvoltages in electric power systems (including sensors, signal transmission devices, and recording instruments).

This guide applies to single-phase gas-insulated switchgear (GIS) tubes, air-insulated substations (AIS) and other equipment with a voltage level of 110 kV and above.

Purpose

This guide provides a practical reference document which supervisors, engineers, technicians, and researchers may refer to when developing measuring systems for conducting fast-front and very fast-front overvoltage measurements in the field.