Wrought aluminium and aluminium alloy enclosures for gas-filled high-voltageswitchgear and controlgear
2 Scope and field of application
2.1 Type of equipment
This Standard applies to fusion welded wrought aluminium and aluminium alloy
enclosures pressurized with dry air, inert gases, eg, sulphur hexafluoride,
carbon tetrafluoride, or nitrogen or a mixture of such gases, 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
(a) 1kV and up to and including 52kV and with gas-filled compartments with
design pressure greater than 3 bar (gauge); and
(b) 72.5 kV and above.
The enclosures comprise parts of electrical equipment not necessarily limited
to the following examples:
busbars and connections.
The scope covers also pressurized components such as the centre-chamber of live
tank switchgear and controlgear, gas-insulated current transformers, etc.
The production of the enclosures shall be in accordance with documented welding
procedures which shall be carried out by well trained and supervised welding
personnel. Where International Standards (ISO or CEN) are not available
National Standards may be used.
This standard will be revised as soon as possible when ISO or CEn
standards covering the various aspects are available.
2.3 Quality assurance
It is the intention of this standard that the switchgear manufacturer shall be
responsible for achieving and maintaining a consistent and adequate quality of
product. Suggicient examinations shall be made by the enclosure manufacturer
to ensure that the materials, production and testing comply in all respects
with the requirements of this standard and ISO 6213 : 1983. Inspection by the
user's inspectors shall not absolve the switchgear manufacturer from his
responsibility to exercise such quality assurance procedures as to ensure that
the requirements and the intent of this standard are satisfied.
NOTE: The manufacturer should have a quality assurance program
registered to the applicable ISO 9000 series standards.