Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1986-04-23
1987-08-04
Hix, L. T.
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
307113, 361189, H02H 510, H01H 920
Patent
active
046848258
ABSTRACT:
400 Hz aircraft ground power supply with a three phase AC power source connectable via an electric power relay and flexible cable provided with a socket connector to a plug connector at the aircraft. In the energizing circuit of the power relay is arranged a closing contact of a second electric relay, the energizing circuit of which is led via switching means at the socket connector to be actuated by a pin of the plug connector. Thus the closing contact of the second relay is opened as long as the socket connector is not plugged to the plug connector. A third electric relay energized via the connectors by a source of DC current on board the aircraft has a closing contact in parallel to the closing contact of the second relay in the energizing circuit of the power relay and further opening contacts disconnecting a separate source of voltage in the energizing circuit of the second relay if the third relay is energized.
REFERENCES:
patent: 3413486 (1968-11-01), Flieder et al.
patent: 4008403 (1977-02-01), Rose
patent: 4044208 (1977-08-01), McDonald et al.
patent: 4163134 (1979-07-01), Budrose
British Standard: Aerospace Series, G 219:1975, "Gen. Requirements for Ground Support Electrical Supplies," pp. 1-7 (BSI, London).
Euro-Standard 400 Hz-DFS 400, Part 1, 1982, "Specification for 400 Hz Aircraft Power Supply," pp. 1-20.
"A Proposed European Standard for 400 Hz Systems," G. Dettweiler et al., Airport Forum-No. 2/1983.
Anton Piller GmbH & Co. KG
Hix L. T,.
Porterfield David
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