Monitored fire protection system
First Claim
1. An electrical protection system comprising:
- a plurality of suppressor units activatable to suppress an abnormal condition;
a plurality of electrical current responsive activators, one associated with each of said suppressor units and adapted to induce activation thereof;
an activator current supply means;
activator control circuit means comprising series circuit means connecting said activators in series, a sensor means for said abnormal condition, and initiator means responsive to said sensor means for initiating activating current flow from said activator supply means to said series connected activators so as to induce activation of said suppressor units;
a supervisory current supply means providing through said series connected activators a constant level of supervisory current flow insufficient to induce activation of said suppressor units;
fault voltage responsive means for detecting a given abnormally high voltage level across said series connected activators; and
switching circuit means for connecting said activators in parallel in response to detection of said abnormally high voltage across said series connected activators.
3 Assignments
0 Petitions
Accused Products
Abstract
An electrical fire protection system including a plurality of extinguishant filled suppressor units activatable by explosive squibs connected in series. In response to the detection of an abnormal condition associated with fires, a control circuit initiates an activating current flow that detonates the explosive squibs and induces release of the extinguishant from the suppressor units. A supervisory current supply establishes through the series connected squibs, a constant level of supervisory current flow that is insufficient to induce detonation of the squibs but establishes a detectable voltage drop thereacross. In response to the detection of an abnormally high voltage level across the series connected squibs, a switching circuit switches the squibs from a series to a parallel circuit relationship.
66 Citations
15 Claims
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1. An electrical protection system comprising:
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a plurality of suppressor units activatable to suppress an abnormal condition; a plurality of electrical current responsive activators, one associated with each of said suppressor units and adapted to induce activation thereof; an activator current supply means; activator control circuit means comprising series circuit means connecting said activators in series, a sensor means for said abnormal condition, and initiator means responsive to said sensor means for initiating activating current flow from said activator supply means to said series connected activators so as to induce activation of said suppressor units; a supervisory current supply means providing through said series connected activators a constant level of supervisory current flow insufficient to induce activation of said suppressor units; fault voltage responsive means for detecting a given abnormally high voltage level across said series connected activators; and switching circuit means for connecting said activators in parallel in response to detection of said abnormally high voltage across said series connected activators. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An electrical protection system comprising:
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a plurality of suppressor units activatable to suppress an abnormal condition; a plurality of electrical current responsive activators, one associated with each of said suppressor units and adapted to induce activation thereof; an activator current supply means; activator control circuit means comprising series circuit means connecting said activators in series, a sensor means for said abnormal condition, and initiator means responsive to said sensor means for initiating activating current flow from said activator supply means to said series connected activators so as to induce activation of said suppressor units; a supervisory current supply means providing through said series connected activators a constant level of supervisory current flow insufficient to induce activation of said suppressor units; and a maximum voltage responsive means for detecting a substantially open circuit voltage level across said series connected activators, and a disable means responsive to the detection of said open circuit voltage level for preventing the initiation of activating current flow to said series connected activators. - View Dependent Claims (13, 14, 15)
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Specification