Ground-fault protected ballast

Details Ground-fault protected ballast Ground-fault protected ballast

1985-05-06

1989-08-08

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 42, 315307, H02H 333

Patent

active

048558605

ABSTRACT:
An inverter-type ballast has built-in differential current transformer operative to sense any substantive difference in the currents flowing from each of its two output terminals. If a substantive difference exists for more than just a brief period, a trigger circuit operates to disable the inverter, thereby to remove voltage from the output terminals.

REFERENCES:
patent: 3633070 (1972-01-01), Yassos et al.
patent: 3662216 (1972-05-01), Hildebrant
patent: 4005335 (1977-01-01), Perper
patent: 4053813 (1977-10-01), Kornrumpf et al.
patent: 4115829 (1978-09-01), Howell
patent: 4240009 (1980-12-01), Paul
patent: 4258403 (1981-03-01), Shimp
patent: 4553070 (1985-11-01), Sairanen et al.
patent: 4563719 (1986-01-01), Nilssen

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