Requirements for enclosure partitioning in GIS design according to IEC standard

The partitioning of a Gas - Insulated Switchgear (GIS) is significantly influenced by the service continuity requirements during maintenance, repair, and extension activities. Additionally, local health and safety regulations must be taken into account.

GIS should be divided into compartments in a way that:

• During various operations that necessitate the de - energization of certain parts of the GIS, such as maintenance, repair, and extension, the compartments taken out of service adhere to the user's service continuity requirements.

• The impact of an internal arc within a compartment is restricted to that specific compartment only.

• In the event of a major failure, the duration of unavailability aligns with the user's service continuity requirements.

• Considering the available gas handling equipment, the gas compartment can be evacuated and refilled within a reasonable time frame.

Each compartment must be equipped with:

• A filling valve.

• A gas monitoring device.

Based on the GIS design, each compartment may also be equipped with the following accessories:

• A pressure relief device.

• A desiccant.

• An internal fault arc location detector.

The figure provides an example of a partitioning design for different types of adjacent compartments.