Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Nonquantitative
Patent
1998-06-29
2000-10-17
Metjahic, Safet
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Nonquantitative
324522, G01R 1914
Patent
active
061337234
ABSTRACT:
A fault indicator contained within a protective equipment closure of the type used to house pad-mounted components of a power distribution system detects the occurrence of a fault current in a monitored conductor and provides a light indication thereof. The fault indicator includes a circuit monitoring module, having an integral fault indicator flag module, and a remote fault indicator light module. A status-indicating flag is rotatably mounted in the integral fault indicator flag module. The flag is positioned in either a reset indicating position or a fault indicating position by a magnetic pole piece, which is magnetized in one magnetic direction or the other by momentary application of a current in one direction or the other to an actuator winding on the pole piece. A magnetically actuated reed switch in an auxiliary magnetic circuit comprising an auxiliary pole piece magnetized by the actuator winding and a bias magnet magnetically aligned to oppose the reset magnetic orientation and reenforce the trip magnetic orientation of the magnetic pole piece closes upon occurrence of the fault current to connect an internal battery to an LED contained within the remote fault indicator light module so that the LED is visible from the exterior of the protective equipment enclosure. The sufficiency of the energy level of the battery may be tested by actuating a magnetically actuated reed switch contained within the remote fault indicator light module, which likewise connects the battery to the LED.
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E. O. Schweitzer Manufacturing Co.
Metjahic Safet
Nguyen Vincent Q.
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