Arc fault circuit interrupter
First Claim
1. An arc fault detecting device for protecting electric power lines, comprising:
- a sensor for sensing the first derivative of the electric power line current;
circuit means for converting the first derivative of the line current into first and second signals, the first signal in response to step transitions of arc current of a first polarity, the second signal in response to step transitions in arc current of a second polarity, and generating a fault signal when one of the first and second signals follows the other within a first time, and a repetition of one of the first and second signals following the other of the first and second signals occurs within a second time.
1 Assignment
0 Petitions
Accused Products
Abstract
An arc fault detector for detecting electric power lines includes a sensor for sensing the derivative of the current on the electric power line, a converter circuit for converting the derivative of the line current into first and second signals, the first signal responsive to positive step transitions of arc fault current, and the second signal responsive to negative step transitions of arc current, and a temporal detector for signaling the presence of an arc fault when one of the first and second signals follows the other within a predetermined time, or window, and in which a sequence of one of the signals following the other signal occurs in a second predetermined interval of time.
-
Citations
28 Claims
-
1. An arc fault detecting device for protecting electric power lines, comprising:
-
a sensor for sensing the first derivative of the electric power line current;
circuit means for converting the first derivative of the line current into first and second signals, the first signal in response to step transitions of arc current of a first polarity, the second signal in response to step transitions in arc current of a second polarity, and generating a fault signal when one of the first and second signals follows the other within a first time, and a repetition of one of the first and second signals following the other of the first and second signals occurs within a second time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
-
Specification