2.1 Type of equipment
This standard applies to cast resin partitions pressurized with inert gases, for example
sulfur hexafluoride or a mixture of gases such as sulfur hexafluoride and nitrogen
used in indoor or outdoor installations of high-voltage switchgear and controlgear,
where the gas is used principally for its dielectric and/or arc-quenching properties,
with rated voltages
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— 1 kV and up to and including 52 kV and with gas-filled compartments with design pressure
greater than ;3 bar (gauge)
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— and with rated voltage 72,5 kV and above.
The partitions comprise pressurized barriers in electrical equipment not necessarily
limited to the following examples:
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circuit breakers,
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switch disconnectors,
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disconnectors,
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earthing switches,
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current transformers,
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voltage transformers,
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surge arrestors,
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busbars and connections,
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cable connections.
This standard does not apply to high-voltage bushings (see HD 358 S3 (IEC 517)).