Electromagnetic switch with undervoltage and phase failure prote

Details Electromagnetic switch with undervoltage and phase failure prote Electromagnetic switch with undervoltage and phase failure prote

1991-01-08

1991-09-10

Deboer, Todd E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

361 85, H02H 324

Patent

active

050478893

ABSTRACT:
A protective device prevents electrical load, such as three-phase induction motor, from overheat fault caused by undervoltage and phase failure condition in a three-phase power supply system. The circuit arrangement of the protective device includes a rectifier circuit, a voltage dropping circuit, a filter circuit, a current limiting circuit, a photo coupling circuit, and a large current control switch for controlling actuating coil of an electromagnetic switch. When the fault condition of undervoltage and phase failure is happen, the protective device will cut the load off the three-phase power source so that both the load and electromagnetic can be protected.

REFERENCES:
patent: 4390871 (1983-06-01), Andrews
patent: 4703387 (1987-10-01), Miller

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