Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Electrical signal parameter measurement system
Reexamination Certificate
2007-01-16
2007-01-16
Hoff, Marc S. (Department: 2857)
Data processing: measuring, calibrating, or testing
Measurement system in a specific environment
Electrical signal parameter measurement system
C702S058000, C702S059000, C702S062000
Reexamination Certificate
active
11064071
ABSTRACT:
A power breaking apparatus for prevention of electrical shock breaks AC power supplied to electrical structures such as traffic lights, streetlights etc. if a leakage voltage is detected over a preset voltage or the electrical structures are inundated, thereby preventing electrical shock from inundation or leakage voltage. A plurality of inundation sensor rods of inundation sensing unit sense inundation of the metal posts. A plurality of leakage voltage sensor rods of the leakage voltage sensor sense leakage voltage. A power break signal generation unit generates ground current if the inundation sensing unit senses inundation or the leakage voltage sensor senses leakage voltage over a preset voltage and shots AC power to the ground if a predetermined time lapses. A zero phase sequence current transformers (ZCTs) detect the ground current. A leakage zero phase detector controls wiring breaker and a magnetic switch to break AC power according as the ZCTs detect ground current. The wiring breaker detects transient current to break AC power if the power break signal generation unit shorts AC power lines.
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Hoff Marc S.
Ladas & Parry LLP
Suarez Felix
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