BS 7632:1993

Specifies requirements and tests together with a guide for the co-ordination of fuse and disconnector protection.

1.1 This standard applies to internal fuses used to protect capacitors for inductive heat generating plants operating at frequencies between 40 Hz and 60 Hz, in accordance with IEC Publication 110, Recommendation for Capacitors for Inductive Heat Generating Plants Operating at Frequencies between 40 and 24 000 Hz.

1.2 This standard also applies to internal overpressure disconnectors used to protect self-healing metallized dielectric capacitors.

1.3 This standard does not apply to fuses and disconnectors for which the service conditions, in general, are incompatible with the requirements of the standard, unless otherwise agreed between manufacturer and purchaser.

1.4 Fuses and disconnectors conforming to this standard are designed to isolate faulted capacitor elements or capacitor unit, to allow operation of the remaining parts of that capacitor unit and the bank in which the capacitor unit is connected. Such fuses and disconnectors are not a substitute for a switching device such as a circuit-breaker, or the external protection of the capacitor bank, or part thereof.