H - Electricity – 02 – H
Patent
H - Electricity
02
H
H02H 1/00 (2006.01) G08C 19/00 (2006.01) H04B 3/54 (2006.01) H04L 27/32 (2006.01)
Patent
CA 2528769
The present invention is concerned with the transmission of protection commands to a remote tripping device over an analog signal link with a limited number of tones or frequencies (F1, F2, F3, F4). Different operating principles involve a number of frequency detectors (41, 42, 43, 44) depending on the number of commands (A, B, C, D) that are to be transmitted either alone or in combination. In order to transmit a maximum number of protection commands with a minimum number of tones/detectors, two of the abovementioned distinct operating principles are assigned at least one common tone. A prioritizing mechanism is established for preferring certain related protection commands belonging to a common application. Upon reception of a signal coding a combination of protection commands, it is possible to detect individual protection commands in accordance with different minimum safety and/or security values. A protection command can thus always be transmitted optimally for the intended application, i.e. the parameters of safety and/or security, dependability and transmission time are individually configurable for the protection command.
Abb Technology Ag
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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