H - Electricity – 02 – H
Patent
H - Electricity
02
H
348/19
H02H 3/07 (2006.01)
Patent
CA 1262957
PO3-12534 DISTRIBUTION LINE SWITCHGEAR CONTROL WITH ISOLATED CASCADED POWER SUPPLIES Abstract of the Invention A distribution line switchgear control is disclosed which is particularly suitable for use with recloser switchgear which requires small amounts of power from the control for operation. The control is most usefully powered for continued operation by small amounts of line current provided through a power source current transformer and includes multiple capacitors which are arranged in a cascaded control power supply having a plurality of isolated stages. The line current is precisely monitored through sensing means current transformers by the control which causes the recloser to trip, reclose and lockout, as is appropriate to protect the distribution line and distribution electricity. Inhibit means prevent the control from issuing a trip signal, unless sufficient energy exists in a trip portion of the cascaded power supply. A variety of volatile timers and counters enable the control to cause the recloser to trip, reclose and lockout. Initialization means, sensing the cascaded power supply, and a non- volatile state memory responsive to trip, close and lockout signals of the control, cause the initialization of the volatile and non-volatile elements to prevent inappropriate control signals.
503420
Cooper Industries Inc.
Gowling Lafleur Henderson Llp
LandOfFree
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