BS 5524(1992) : 1992 AMD 9211

Committees responsible
National foreword
Foreword
1 Scope
2 Normal and special service conditions
3 Definitions
4 Rating
4.1 Rated voltage
4.2 Rated insulation level
4.3 Rated frequency
4.4 Rated normal current and temperature rise
4.5 Rated short-time withstand current
4.6 Rated peak withstand current
4.7 Rated duration of short-circuit
4.8 Rated supply voltage of closing and opening
       devices and auxiliary circuits
4.9 Rated supply frequency of operating devices and
       auxiliary circuits
4.10 Rated pressure of compressed gas supply for
       operating mechanisms
4.101 Rated density of gas for insulation
5 Design and construction
5.1 Requirements for liquids in switchgear and
       controlgear
5.2 Requirements for gases in switchgear and
       controlgear
5.3 Earthing
5.4 Auxiliary equipment
5.5 Dependent power closing
5.6 Stored energy closing
5.7 Operation of releases
5.8 Low and high pressure interlocking devices
5.9 Nameplates
5.101 Degree of protection
5.102 Internal fault
5.103 Enclosures
5.104 Partitions
5.105 Pressure relief
5.106 Disconnectors and earthing switches
5.107 Interlocks
5.108 Noise
5.109 Provisions for dielectric tests on cables
6 Type tests
6.1 Dielectric tests
6.2 Radio interference voltage (RIV) tests
6.3 Temperature-rise tests
6.4 Measurement of the resistance of the main circuit
6.5 Short-time and peak withstand current tests
6.101 Verification of making and breaking capacities
6.102 Mechanical operation tests
6.103 Verification of the degree of protection for
       auxiliary circuits and moving parts
6.104 Proof tests for enclosures
6.105 Weatherproofing test
6.106 Test under conditions of arcing due to an
       internal fault
6.107 Thermal stability test
6.108 Operation tests at limit temperatures
6.109 Gas tightness tests
7 Routine tests
7.1 Power-frequency voltage tests on the main circuit
7.2 Dielectric tests on auxiliary and control
       circuits
7.3 Measurement of the resistance of the main circuit
7.101 Partial discharge measurement
7.102 Pressure tests of enclosures
7.103 Gas tightness tests
7.104 Mechanical operation tests
7.105 Tests of auxiliary electrical, pneumatic and
       hydraulic devices
7.106 Verification of the correct wiring
7.107 Tests after erection on site
8 Guide to the selection of the switchgear for
       service
National annex NA (informative)

Gives requirements for gas-insulated metal-enclosed switchgear in which the insulation is obtained, at least partly, by an insulating gas other than air at atmospheric pressure, for alternating current of voltages of 72,5 kV and above, for indoor and outdoor installation, and for service frequencies up to and including 60 Hz. The term 'switchgear' is used for 'gas-insulated metal-enclosed switchgear'. The gas-insulated metal-enclosed switchgear consists of individual components directly connected together and able to operate only in this manner. Completes and amends, the various relevant standards applying to the individual components constituting gas-insulated metal-enclosed switchgear. BS AMD 9211 RENUMBERS THIS STANDARD