Electric power conversion systems – Current conversion – Including automatic or integral protection means
Patent
1986-04-22
1987-06-09
Wong, Peter S.
Electric power conversion systems
Current conversion
Including automatic or integral protection means
361111, H02H 710
Patent
active
046725237
ABSTRACT:
The present invention relates to a protective device for a load connected to a power supply line of an electric power system, comprising an LC network having low-pass characteristics, connected into the power supply line on the system side preceding the load. So that disturbances with frequencies below the cut-off frequency of the LC network can also be kept away from the load, a switching element controlled by a monitoring device is arranged according to the invention in series with the LC network in the power supply line. The monitoring device is connected to the power supply line on the system side at a junction preceding the switching element and keeps the switching element closed only for as long as the instantaneous value of the time derivation of the voltage on the power supply line deviates from the instantaneous value of a nominal value which is predeterminable in its variation with time, by no more than an equally predeterminable amount.
Ari Niyazi
Hansen Diethard
Hoitink Hendrik
Schar Hans
BBC Brown Boveri & Company Limited
Jones Judson H.
Wong Peter S.
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