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This circuit shuts down a ferroresonant power supply if a fault occurs, and allows a restart without the use of auxiliary resetting switches.
English (United States)
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Power Shutdown Circuit Using A Time Delay Relay
This circuit shuts down a ferroresonant power supply if a fault occurs, and
allows a restart without the use of auxiliary resetting switches.
In normal operation, power is supplied to DC load 7 by ferroresonant
transformer and filters 6 while sense circuitry 9 applies power to hold relay 10
whose contacts 4 and 5 allow input AC power from source 1 to be applied to DC
load 7 and AC load 8. If a fault occurs in the transformer and filters 6 or DC load
7, sense circuitry 9 removes power from hold relay 10, causing contacts 4 and 5
to open and removing power from DC load 7 and AC load 8.
Clearing the now latched circuitry is accomplished by manual removal of
input AC power 1, which causes time delay relay 2 to deenergize and close its
contact 3. When AC power 1 is then manually reapplied, it is supplied to
transformer and filters 6 via contact 3 of relay 2. After power up of the DC load 7
is complete, sense circuitry 9 energizes the hold relay 10, closing contacts 4 and 5. After a reasonable time, the time delay relay 2 times out, and opens its
contact 3, and power is again being supplied as in normal operation. If a fault
had been present at power reapplication, the hold relay would not close contacts
4 and 5, and at the completion of its time out, time delay relay 2 would remove all
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