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Circuit interrupter with cause for trip indication
| Details |
Inventors: Mackenzie, Raymond W.; Wafer, John A.;
Assignee: Eaton Corporation (Cleveland, OH)
Primary Examiner: Gaffin; Jeffrey A.
Assistant Examiner: Jackson; Stephen
Attorney, Agent or Firm: Moran; Martin J.
In a circuit interrupter which has multiple electronic trip circuits, such as ground fault and arcing fault trip circuits, indicators such as LED's produce an indication of the cause of the trip. The trip signals are latched to provide a continuing trip indication and ORed to actuate the trip device. In one embodiment SCR's connected in series with the indicator LED's serve as the latches and are connected in parallel to the trip device to provide the OR function. In other embodiments, flip-flops serve as the latches. In one such embodiment, the indicator LED's are connected from the respective flip-flops in parallel to the trip device to provide the OR function. In another such embodiment the flip-flops actuate the trip device and turn on switches actuating the LED's These switches energizing the cause of trip LED's are disabled until the contacts open to assure operation of the trip device. Alarms can be coupled to the trip circuit by additional LED's, preferably IR LED's, connected in series with the indicator LED's. |
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DETAILED DESCRIPTION It is a primary object of the present invention to provide a circuit interrupter which provides an indication of the cause of trip in a circuit breaker which includes an arcing fault trip function.
Accordingly, in a circuit interrupting device which has an arcing fault detector which generates an arcing fault trip signal and a second electronic circuit which detects another type of fault, such as a ground fault, and generates a second trip signal.
, either of which results in opening of the contacts of the circuit interrupting device, the response means which opens the contacts includes indicator means providing an indication of which trip signal caused opening of the contacts.
In order to provide this indication, latch means latch the respective trip signals.
The latch signals are then used to turn on indicator means, such as preferably LED's.
The latched signals are also ORed to turn on a switch, such as an SCR, which energizes a trip solenoid to open the contacts.
In one embodiment of the invention, the latch means comprises SCR's having their gates connected to the associated electronic trip circuit and being connected in series with the associated LED.
These latching SCR's are connected in parallel to the gate of the SCR which actuates the trip device in order to provide the OR function for tripping in response to either electronic trip signal.
In other embodiments of the invention, the latching function is performed by flip-flops.
In one such embodiment, the indicator LED's are connected to the outputs of the flip-flops and in parallel to the gate of the SCR actuating the trip device in order to provide the OR function.
In yet another embodiment of the invention, the outputs of the latch means are ORed to turn on the SCR actuating the trip device.
The outputs of the latch means are also used to turn on switches which energize the respective LED indicators.
In this embodiment, gates are preferably provided between the latch means and the switches turning on the LED's so that the switches are only enabled after the circuit breaker is open, and thus, full power is available for opening the contacts
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