Method and device for monitoring switchgear in electrical...

Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor

Reexamination Certificate

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Details

C361S093600, C324S424000, C324S207150

Reexamination Certificate

active

07123461

ABSTRACT:
The invention relates to a method, a computer programme and a device (2) for determining contact wear in an electrical switchgear (3) in an electric switchgear assembly (1) as well as to a switchgear assembly (1) with such a device (2). According to invention, for determining a contact wear status variable (Cwsum) a current measuring signal (Imess) is monitored for deviations (Δ) from an expected faulty switch-off current (If) and, in case of deviations, the status variable (Cwsum) is not immediately calculated from current measuring signal (Imess), but indirectly using a characteristic current value (Ichar). Embodiments, among other things, relate to: deviations by saturation of the current transformer (30) and maximal current measuring signal (Imax) as characteristic current value (Ichar); status variable (Cwsum) as a measure for arcing power during switching-off and, in particular, equal to a potential function (f(Imess)) of the switch-off current (Imess). Advantages, among others, are: improved calculation of contact wear, improved condition based instead of periodic maintenance of switchgears (3), increased operational safety at reduced maintenance cost.

REFERENCES:
patent: 4620156 (1986-10-01), Alvin et al.
patent: 4780786 (1988-10-01), Weynachter et al.
patent: 6466023 (2002-10-01), Dougherty et al.
patent: 199 28 192 (2000-12-01), None
patent: 102 04 849 (2002-08-01), None
patent: 0 193 732 (1986-09-01), None

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